SMP Site # 3   Represents average residence time of water leaving the Hardwood Plant. Water at this site does not go through a storage facility, but the chlorine residual is generally 35 to 40 percent of the Hardwood Plant finished water concentration. We attribute this loss of chlorine to the fact that the transmission and distribution lines serving this area are older unlined cast iron and have been observed to show significant build up of corrosion by products ( tubercles). We believe that these corrosion by products exert a chlorine demand that results in lower than typical chlorine residual at this site, although we believe it has a lower average water age than SMP # 2.

SMP Site # 4   Represents high HAA5 levels. Sample site is in an area approaching the perimeter of the distribution system. Water in this area is primarily from the Hardwood Plant. Chlorine residual at this site ranges between 0.2 and 0.6 mg/ L, and the heterotrophic plate count is consistently below 100 cfu per mL year round.

SMP Site # 5   Represents high HAA5 levels. We have over 7 years of data from this site. Water at this site is from the Hardwood Plant. Chlorine residual levels are between 0.3 and 0.5 mg/ L, and heterotrophic plate count is below 100 cfu/ mL.

SMP Site # 6   Represents high TTHM levels. This sampling site is believed to receive water from a 4 MG ground tank located in the Appleville region of the distribution system during high demand periods and is at the entrance to a small subdivision cul de sac in the Oakville community. This site is near the predicted edge of the mixing zone, and chlorine residuals at this site are generally very low, indicating this may be a hydraulic dead end. The sample site is near the first house on the cul de sac ( which has 12 homes total). Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft E 8 SMP Site # 7   Represents high TTHM levels. This site is near the edge of the mixing zone between the Softwood River and Hardwood plant influence areas, but within the an area of the system believed to receive all of its water from the Hardwood Plant. Chlorine residual levels ranged between 0.2 and 0.4 mg/ L at this site.

SMP Site # 8   Represents high TTHM levels. This site has been problematic in the past due to positive total coliform test results, non detectable chlorine residuals, high heterotrophic plate count results, and odor complaints. A 4 inch blow off was installed downstream of this site, but it continues to have periodic poor water quality. Water in this area is from the Hardwood Plant.

SMP Site # 9   Entry point to the distribution system for the Softwood River Water Treatment Plant. This site is just after the high service pumps at the Water Treatment Plant.

SMP Site # 10   Represents average residence time. Chlorine residual is generally 50 to 60 percent of the plant finished water concentration.

SMP Site # 11   Represents average residence time. Water does not go through a storage facility but the chlorine residual is generally 35 to 40 percent of the plant finished water concentrations. The transmission and distribution lines serving this area are older unlined cast iron with build up of corrosion by products ( tubercles) in several areas. We believe these corrosion by products exert a chlorine demand, lowering chlorine residual, even though residence time is less than in areas with similar chlorine residual concentrations.

SMP Site # 12   Represents high HAA5 levels. At this site, the water age is believed to be greater than average because it is within the mixing zone, but the chlorine residual is never below 0.4 mg/ L and the heterotrophic count plate is usually low ( below 100 cfu/ mL).

SMP Site # 13   Represents high HAA5 levels. Our Stage 1 DBPR monitoring results indicate that the high HAA5 concentrations move around our system depending on the season and production of the Hardwood and Softwood River Plants, especially in the areas served by the Softwood River Plant.

SMP Site # 14   Represents high TTHM levels. This sample site is located in a zone of the distribution system that has been recently developed. This connection is located downstream from a chlorine booster station. Chlorine residuals are normally in the 0.3 to 0.7 mg/ L range. Water in this area is generally a mix of water from the Hardwood and Softwood River Plants.

SMP Site # 15   Represents high TTHM levels. This site is downstream from the Cypressville Storage Tank, a 1.5 million gallon elevated storage tank. There are often low chlorine residuals in the areas downstream of this tank.

SMP Site # 16   Represents high TTHM levels. This sampling site is in the mixed zone before the last group of connections near the end of the distribution system. This area receives water from the Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft E 9 Jackson Storage Tank and water that bypasses the tank. Water from this area can vary greatly in the percentages of Softwood River and Hardwood Plant water.

5. SMP Sample Schedule:

Because the quarterly Stage 1 DBPR monitoring is the only DBP monitoring that has been performed in the Elm City system, historic DBP data is available for only the months of January, April, July, and October. July has regularly had the highest DBP levels, but no DBP data is available for the other summer months. As a result, we also reviewed finished water temperature from two years of TCR sampling records and determined that our peak month for distribution system water temperature is August. However, we also found that July's average distribution system water temperature for the two years reviewed was only 0.5 º C less than August's. Based on the historic DBP data and minimal difference in average water temperature, we concluded that July is the controlling month for the Elm City distribution system. The following table summarizes our planned SMP sample dates and is based on collection of our samples on the second Monday of the month.

Proposed SMP Sample Schedule Planned Sample Date November 8, 2005 January 10, 2006 March 7, 2006 May 9, 2006 July 11, 2006 September 12, 2006 Dual sample sets will be collected from each of the 16 SMP sample sites on or close to the listed dates and analyzed for TTHM and HAA5 by a State certified laboratory. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft E 10 Poplarville MIXING ZONE Softwood River WTP Hardwood WTP Elevated Storage Tank Ground storage tank Pump station Chlorine Booster Station 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 9 16 15 14 13 12 11 10 Stage 1 DBPR site TCR / Selected SMP site Appleville Weeping Willow Oakville Pineville Cedarville Cypressville Downtown Industrial Park PS2 CB2 PS3 CB1 PS1 Elm City Influence Zones And Sample Sites 6. Map of the distribution system showing major transmission mains, numbered Stage 1 DBPR compliance sites, and numbered SMP sample sites: Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft E 11 II. SMP RESULTS 1. Introduction:.

The SMP was conducted between November 2004 and September 2005. The following table summarizes our planned SMP sample dates, the actual dates when samples were collected, and the reasons for deviations from the plan.

Actual SMP Sample Schedule Planned Sample Date Actual Sample Date Explanation November 8, 2005 November 8, 2005 On schedule.

January 10, 2006 January 10, 2006 On schedule.

March 7, 2006 March 11, 2006 M a j o r s n o w s t o r m c r e a t e d hazardous road conditions and limited access to sample sites May 9, 2006 May 9, 2006 On schedule.

July 11, 2006 July 11, 2006 On schedule.

September 12, 2006 September 12, 2006 On schedule 2. Summary of IDSE SMP and Stage 1 DBPR compliance data:

All DBP results from the SMP and concurrent Stage 1 DBPR compliance monitoring are presented in this section. Table E. 3 presents the DBP results for the SMP sample sites, organized by plant, then in order of highest to lowest TTHM average. Table E. 4 presents the DBP results for the Stage 1 DBPR compliance sample sites for the period from November 2004 to August 2005. Sites proposed as Stage 2B compliance sites are shaded within the tables. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft E 12 Table E. 3. Elm City   IDSE SMP Monitoring Results SMP Site # Plant Site Type TTHM ( µ g/ L) HAA5 ( µ g/ L)

Data1 LRAA Data1 LRAA 1 Hardwood entry point 36, 42, 30, 25, 38, 28 33 50, 44, 43, 47, 48, 38 45 2 Hardwood average residence time 54, 39, 42, 56, 60, 42 49 22, 29, 36, 40, 41, 30 33 3 Hardwood average residence time 47, 40, 52, 43, 51, 41 46 20, 25, 25, 29, 27, 19 24 4 Hardwood high HAA5 33, 29, 41, 42, 44, 22 35 36, 43, 52, 51, 48, 38 45 5 Hardwood high HAA5 35, 40, 41, 37 46, 43 40 60, 59, 64, 55, 66, 54 60 6 Hardwood high TTHM 62, 60, 60, 64, 68, 70 64 42, 40, 33, 38, 46, 30 38 7 Hardwood high TTHM 68, 62, 54, 52, 72, 70 63 39, 45, 28, 33, 40, 32 36 8 Hardwood high TTHM 65, 61, 73, 71, 72, 64 68 41, 39, 46, 45, 39, 47 43 9 Softwood River entry point 40, 42, 49, 38, 38, 46 42 43, 47, 40, 48, 45 10 Softwood River average residence time 42, 20, 58, 62, 62, 30 46 23, 56, 40, 52, 40, 28 40 11 Softwood River average residence time 47, 50, 41, 54, 48, 40 47 14, 20, 21, 23, 29, 19 21 12 Mix/ Softwood River high HAA5 35, 29, 47, 37, 47, 27 37 36, 40, 46, 48, 40, 34 41 13 Softwood River high HAA5 52, 35, 46, 42, 50, 38 44 56, 44, 65, 50, 50, 58 54 14 Mix/ Softwood River high TTHM 56, 50, 55, 51, 61, 45 53 42, 30, 43, 38, 34, 42 38 15 Softwood River high TTHM 48, 56, 70, 52, 65, 49 57 28, 40, 33, 38, 34, 42 35 16 Mix/ Softwood River high TTHM 72, 49, 68, 55, 69, 53 61 20, 21, 38, 28, 19, 35 27 1Data obtained from sampling every 60 days are listed in order for November, January, March, May, July, and September ( as required for a surface water supply $ 10,000). Note: Bold text and shading identify proposed Stage 2 DBPR compliance sites. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft E 13 Table E. 4. Elm City   Stage 1 DBPR Compliance Monitoring Results Site ID # Plant Site Type TTHM ( µ g/ L) HAA5 ( µ g/ L)

Data1 LRAA Data1 LRAA Stg. 1 # 1 Softwood River Average 45, 34, 56, 62 49 24, 32, 43, 45 36 Stg. 1 # 2 Softwood River Average 36, 42, 45, 45 42 47, 50, 55, 56 52 Stg. 1 # 3 Softwood River Average 32, 34, 48, 67 45 50, 62, 64, 65 59 Stg. 1 # 4 Softwood River Maximum 64, 68, 83, 74 72 21, 25, 26, 28 25 Stg. 1 # 5 Hardwood Average 44, 20, 62, 42 42 34, 45, 33, 41 38 Stg. 1 # 6 Hardwood Average 46, 49, 39, 50 46 22, 30, 39, 41 33 Stg. 1 # 7 Hardwood Average 41, 22, 50, 59 43 4, 46, 64, 58 54 Stg. 1 # 8 Hardwood Maximum 65, 50, 60, 73 62 19, 22, 37, 30 27 1Data listed in order for October, January, April, and July quarterly sampling. Note: Bold text and shading identify proposed Stage 2B compliance sites. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft E 14 III. PROPOSED STAGE 2B COMPLIANCE MONITORING SITES 1. Site Summary:

A total of eight Stage 2B compliance monitoring sites ( four per plant) were selected from the Stage 1 DBPR and SMP sites, as shown in the previous tables and as summarized in the following table. A schematic of the monitoring sites is presented in section III. 4.

Stage 2B Proposed Compliance Monitoring Sites Stage 2B Compliance Sites Previous Site ID #

Site # Source/ Plant Type SMP Site # Stage 1 DBPR Site #

1 Softwood River Average Stg. 1 # 3 2 Softwood River High HAA5 Stg. 1 # 21 3 Softwood River High TTHM 16 4 Softwood River High TTHM Stg. 1 # 4 5 Hardwood Average Stg. 1 # 7 6 Hardwood High HAA5 5 7 Hardwood High TTHM 8 8 Hardwood High TTHM Stg. 1 # 8 1 This site was an average residence time site under Stage 1 DBPR, but represented high HAA5 concentrations in the distribution system.

2. Justification of Site Selections:

1. Softwood River Plant Average Site   Although Stage 1 DBPR site # 1 had the highest TTHM LRAA of the Stage 1 average residence time sites, Stage 1 DBPR site # 3 was chosen because the TTHM LRAAs at these two sites were similar, but the HAA5 LRAA at Stage 1 DBPR site # 3 was considerably higher. Therefore, Stage 1 DBPR site # 3 was chosen as Elm City's Stage 2B site # 1.

2. Softwood River Plant Representative High HAA5 Site   Stage 1 DBPR site # 2 and SMP site # 13 had similar HAA5 LRAAs. However, Stage 1 site # 2 was chosen as the Stage 2B # 2 because we have multiple years of data at this site, and this will allow us to maintain an historical record at this site. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft E 15 3. Softwood River Plant Representative High TTHM Sites   SMP site # 16 and Stage 1 DBPR site # 4 were chosen as Elm City's Stage 2B sites # 3 and # 4, respectively, because they had the highest TTHM averages over the SMP sampling period among all Softwood River Plant sample sites.

4. Hardwood Plant Average Site   Stage 1 DBPR site # 7 had the highest HAA5 LRAA for the SMP sampling period, much higher than the other two Stage 1 DBPR average residence time sites, and a TTHM LRAA that was second highest among the Stage 1 DBPR average residence time sites. Therefore, Stage 1 DBPR site # 7 was chosen as Elm City's Stage 2B site # 5.

5. Hardwood Plant Representative High HAA5 Site   SMP site # 5 was chosen as Elm City's Stage 2B site # 6 because it has the highest HAA5 LRAA of all the Hardwood Plant sample sites.

6. Hardwood Plant Representative High TTHM Sites   SMP site # 8 and Stage 1 DBPR site # 8 were chosen as Elm City's Stage 2B sites # 7 and # 8, respectively. SMP site # 8 was chosen because it had the highest TTHM LRAA of all the Hardwood Plant sample sites during the SMP period. Stage 1 DBPR site # 8 was chosen for several reasons. It is in an area of the system not represented by other Stage 2B sites. It is downstream of a storage tank. It will provide historical continuity in DBP sampling. It had a single sample TTHM result higher than the highest single sample result of the two sites that had higher averages ( 73 vs. 72 and 70). It had a TTHM LRAA only slightly lower than the two SMP sites that had higher averages ( 62 vs. 63 and 64) and achieved this average with a warm weather sample being taken in only one month ( July), versus the three warm weather samples ( May, July, and September) taken at the SMP sites.

3. Proposed Stage 2B Compliance Monitoring Schedule Stage 2B compliance monitoring will be scheduled for January, April, July, and October, the same as Stage 1 DBPR and Stage 2A DBPR sampling, for consistency and because the difference in distribution system water temperature between July and August is minimal ( average 0.5 º C higher in August, based on a review of 2 years of TCR sampling records). Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft E 16 Poplarville MIXING ZONE Softwood River WTP Hardwood WTP Elevated Storage Tank Ground storage tank Pump station Chlorine Booster Station Appleville Weeping Willow Oakville Pineville Cedarville Cypressville Downtown Industrial Park PS2 CB2 PS3 CB1 PS1 Elm City Stage 2B DBPR Compliance Sample Sites Stage 2B DBPR Highest TTHM Stage 2B DBPR Highest HAA5 Stage 2B DBPR Average Residence Time #

# # 1 5 3 4 8 7 2 6 4. Map of Proposed Stage 2B Compliance Monitoring Sites: Appendix F IDSE SMP Report for Producing Ground Water Systems Serving $ 10,000 People This appendix is provided as an example IDSE report for producing ground water systems serving at least 10,000 people and opting to complete the Standard Monitoring Program ( SMP).

Chapter 6 presents the detailed SMP requirements for these systems, and Chapter 8 provides guidance on selecting SMP sites and Stage 2B compliance monitoring sites based on SMP results. Chapter 8 also presents the IDSE reporting requirements. The application of the basic guidance on SMP site selection and Stage 2B compliance monitoring site selection is shown in this example, along with several instances of the use of best professional judgement being applied.

The italicized text within the appendix consists of comments and explanations and is not intended to represent the recommended content of an actual IDSE Report. This page intentionally left blank. Initial Distribution System Evaluation Report for Oak City PWSID Number: US5555555 Address: 124 Oak Drive Oak City, US 11111 1234 Contact Person: Mr. Joseph Smith, P. E.

Phone Number: 123 555 1111 Fax Number: 123 555 2222 Email Address: Jsmith@ ci. oakcity. us System Type: Community, ground water Population Served: 200,000 This page intentionally left blank. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft F 1 I. SMP PLAN 1. System Description:

This section of the report should include a summary of typical system operating characteristics ( and how they change on a seasonal basis if appropriate) explaining how sources are used to meet system demands, where high water age is expected to occur, and any special aspects of operation that could affect DBP concentrations in the distribution system. Information about water treatment processes and source water quality data should also be in this section, including a brief description of the water treatment process train.

General system characteristics: Service area: Oak City plus surrounding suburban areas Production: Annual average daily demand = 20 MGD Source Water Information: Silver Springs Wellfield ( Silver Aquifer) pH: from 7.0 to 7.5 Alkalinity: from 125 to 175 mg/ L as CaCO3 TOC: from 1.4 to 2.7 mg/ L as C Blue Springs Wellfield ( Blue Aquifer) pH: from 6.9 to 7.3 Alkalinity: from 82 to 198 mg/ L as CaCO3 TOC: from 2.1 to 3.7 mg/ L as C Entry points and service areas under the influence of each entry point: ( Entry points should be tied to source( s) and typical flows noted.)

Entry points: Silver Plant ( Silver Springs Wellfield), 25 MGD production capacity Winter Average Production = 18 MGD Summer Average Production = 20 MGD Blue Pumping Station ( Blue Springs Wellfield), 10 MGD production capacity Winter Average Production = 0 MGD Summer Average Production = 6 MGD The second supply source ( Blue Springs Wellfield) is necessary to cope with higher demand during the summer. The two wellfields draw from two different aquifers.

When the Blue Pumping Station is in service, customers located in the Cypressville, Cedarville, Poplarville, and north downtown generally receive water from the Blue Springs Wellfield. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft F 2 Customers located in the Elmville, Oakville, Pineville, and south downtown generally receive water from the Silver Plant year round.

Customers located in the Weeping Willow Community, Appleville, and central downtown generally receive a mixture of water from both plants when both the Silver Plant and Blue Pumping Station are in service.

Treatment Provided: Silver Plant: Direct filtration, chlorination, in service 12 months per year. Blue Pumping Station: Chlorination, in service approximately three months per year, during the summer ( over 60 consecutive days of operation). Primary and residual disinfection: Chlorine/ chloramines at both plants.

Description of distribution system: Distribution system ( estimated length of lines and range of diameter): About 600 miles, 4"  56"

The estimated range of residence time of water in the distribution system is 0 to 6 days.

5 storage tanks 1 ground tank 4 MG capacity 4 elevated tanks 6 MG total capacity ( 1.5 MG each)

Pump stations: Station # 1 is located at the ground storage tank. This pump is primarily used during peak demands and low pressure situations. The pump is timed to turn on in the morning and evening during peak demand, and when the pressure drops below 40 psi downstream of the station.

Stations # 2 and # 3. These pumps are used to boost system pressure when the pressure in the areas downstream of these pumps ( Poplarville and Weeping Willow) drops below 40 psi.

Booster facilities: Both facilities are total chlorine paced, and the target dose after boosting is 3.0 to 3.5 mg/ L. Ammonia is added ( residual ammonia before boosting is accounted for) to target a Cl2: NH3 N ratio of 4.5 to 4.0.

Facility # 1 is located on Industrial Park Ave. ( downstream from the Courthouse storage tank at pump station # 3). This facility is occasionally used during the summer when low total chlorine residual ( below 1.0 mg/ L) are measured at remote locations downstream of the booster facility.

Facility # 2 is located at the intersection of First Ave. and 13th St. ( in a mixing zone) in an area of the distribution system where total chlorine residuals are frequently low. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft F 3 Pineville Oakville Elmville Weeping Willow Downtown Appleville Poplarville Cedarville Cypressville MIXING ZONE Blue Pumping Station ( seasonal source)

Silver Plant Elevated Storage Tank Ground storage tank Pump station Booster disinfection station 2 1 3 P P P P Stage 1 DBPR site SMP site 1 4 2 Oak City Distribution System 2. Schematic of the distribution system with SMP and Stage 1 DBPR sites: Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft F 4 3. SMP monitoring requirements:

The system serves approximately 200,000 people and uses two ground water sources. Therefore, a total of 4 SMP sample sites ( 2 per plant) must be sampled approximately every 90 days ( 4 dual sample sets per quarter) for the IDSE.

Required SMP Sample Sites SMP Site Type Number of Sites in the Silver Plant Influence Zone Number of Sites in the Blue Station Influence Zone Representative of high TTHM 1 1 Representative of high HAA5 1 1 Available Data:

Report all data that helped in site selection. If you have bromide, TOC, or HPC data, these may be helpful for justifying Stage 2B site selection. For this example, tables with data from Stage 1 DBPR, Total Coliform Rule, and operational sample sites are presented. The sites chosen as SMP sample sites should also be noted for reference. Your report should include data for all sites that were considered as candidates for SMP sites.

Total chlorine and HPC data were available from Total Coliform Rule sample sites and the two Stage 1 DBPR sample sites. Distribution system water temperature varies over a small range between winter and summer, so chlorine data for November, February, May, and August were reviewed, and monthly averages and an overall average were calculated. The typical average water age at each site was also estimated based on results from the distribution system hydraulic model. Table F. 1 presents this data, with sites grouped by summer time plant service area and then ordered from low to high by the yearly average total chlorine concentration. The selected SMP sample sites are numbered and their type identified for reference.

Quarterly HPC data were available for the same year and at the same sites as the chlorine data. The four results for each site were averaged. The quarterly results and yearly average values are presented in Table F. 2. The results are presented following the order based on the yearly average HPC values. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft F 5 Table F. 1 Oak City Distribution System   Total Chlorine Data Sample Site ID # Source/ Plant Stage 1 Site Type SMP Site # SMP Site Type Total Chlorine ( mg/ L)

Nov. Feb. May Aug. Mean Oper # 9 SP 1 T 0.4 0.3 0.5 0.9 0.5 TCR # 9 SP 3 H 0.9 1.2 1.0 0.9 1.0 TCR # 4 SP 0.9 1.6 0.8 0.6 1.0 Stg. 1 # 2 SP Avg. 0.6 3.0 2.1 0.8 1.6 TCR # 3 SP 1.8 1.8 1.5 2.7 2.0 TCR # 6 SP 2.4 2.7 0.9 2.4 2.1 Oper # 10 SP 1.8 1.3 2.4 3.6 2.3 Oper # 20 SP 4.0 3.6 2.7 4.0 2.6 TCR # 2 BP 2 T 0.6 1.2 0.9 1.0 0.9 TCR # 5 BP 0.6 0.9 1.5 0.9 1.0 TCR # 8 BP 4 H 1.8 1.3 1.6 0.9 1.4 TCR # 1 BP 1.8 2.1 1.8 1.7 1.9 Stg. 1 # 1 BP Avg. 0.6 2.4 2.4 1.5 1.7 Oper # 1 BP 1.8 2.7 3.3 2.4 2.6 TCR # 7 BP 2.7 2.1 3.0 3.6 2.9 Oper # 30 BP 4.0 3.8 4.2 2.9 3.7 SP  Silver Plant TCR  Total Coliform Rule T  Representative High TTHM BP  Blue Plant Stg. 1  Stage 1 DBPR H  Representative High HAA5 Oper.  Operational sample Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft F 6 Table F. 2 Oak City Distribution System   Heterotrophic Plate Counts ( HPC)

Sample Site ID # Source/ Plant Stage 1 Site Type SMP Site # SMP Site Type HPC ( cfu/ mL)

Nov. Feb. May Aug. Mean Oper # 9 SP 1 T 56 42 176 245 130 TCR # 9 SP 3 H 54 65 65 82 67 TCR # 4 SP 43 34 224 156 114 Stg. 1 # 2 SP Avg. 55 60 85 125 81 TCR # 3 SP 53 42 72 84 63 TCR # 6 SP 35 62 92 80 67 Oper # 10 SP 0 0 0 5 1 Oper # 20 SP 0 0 0 0 0 TCR # 2 BP 2 T 70 212 132 356 242 Oper # 30 BP 0 0 4 1 1 TCR # 5 BP 280 163 263 96 201 TCR # 8 BP 4 H 57 72 37 77 68 TCR # 1 BP 56 43 43 143 71 Stg. 1 # 1 BP Avg. 25 52 82 70 57 Oper # 1 BP 15 42 72 60 47 TCR # 7 BP 2 1 12 25 10 SP  Silver Plant TCR  Total Coliform Rule T  Representative High TTHM BP  Blue Plant Stg. 1  Stage 1 DBPR H  Representative High HAA5 Oper.  Operational sample Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft F 7 4. Summary of selected SMP sample sites Present the rationale for the selection of the SMP sample sites.

Sample sites were chosen to represent diverse geographic areas of the distribution system. A description of the four SMP sites for the Oak City metro area distribution system is given below. The distribution system map in section I. 2 shows these sites.

SMP Site # 1   Chosen to represent high TTHM levels in the Silver Plant influence zone and the mixing zone. This monitoring site is located before the last group of connections in proximity to the end of the distribution system in the mixing zone. At this site, water demand tends to be low, total chlorine levels are always low ( ranging between 0.3 and 0.9 mg/ L) and heterotrophic plate counts are often greater than 200 cfu/ mL.

SMP Site # 2   Chosen to represent high TTHM levels in the Blue Pumping Station influence zone. This monitoring site is located after the first group of connections ( approximately 0.5 miles) downstream of the Courthouse Reservoir ( 1.5 MG elevated storage facility) in the influence zone of the Blue Pumping Station.

SMP Site # 3   Chosen to represent high HAA5 levels in the Silver Plant influence zone. Sample tap is a hose bib at an elementary school located in a zone of the distribution system with water age greater than average. Total chlorine levels at this site range between 0.9 and 1.2 mg/ L, and the heterotrophic plate count is consistently below 100 cfu/ mL throughout the year.

SMP Site # 4   Chosen to represent high HAA5 levels in the Blue Pumping Station influence zone and the mixing zone. This site is a dedicated sampling site routinely used for monitoring water quality in downtown Oak City. In this area, the water age is greater than the average, the total chlorine is never below 0.9 mg/ L and the heterotrophic count plate is usually low ( below 100 cfu/ mL). This area is believed to be in the mixing zone, receiving water from both the Blue Pumping Station and Silver Plant. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft F 8 5. SMP Sample Schedule Because the quarterly Stage 1 DBPR monitoring is the only DBP monitoring that has been performed in the Oak City system, historic DBP data is available for only the months of February, May, August, and November. August has regularly had the highest DBP levels. No other DBP data is available for any other months of the year, so water temperature data was also reviewed to see which month of the year had the warmest water temperature. Our review of three years of finished water temperature data from TCR sample sites showed that distribution system water was warmest in August. Therefore, based on the agreement of the water temperature and TTHM and HAA5 monitoring results, we concluded August is the controlling month for the Oak City distribution system. The following table summarizes our planned SMP sample dates and is based on sampling on the second Monday of the month.

Proposed SMP Sample Schedule Planned Sample Date November 8, 2005 February 14, 2006 May 9, 2006 August 8, 2006 Dual sample sets will be collected from each of the four SMP sample sites on or close to the listed dates and analyzed for TTHM and HAA5 by a State certified laboratory. Stage 1 DBPR compliance samples will be collected on the same days.

6. Map of the distribution system showing major transmission mains, numbered Stage 1 DBPR compliance sites, and numbered SMP sample sites:

For this example, the map in Section I. 2 was used to show SMP sample sites. The system in this example has only four SMP sites and two Stage 1 DBPR monitoring sites. Depending on the size of your system and the number of sample sites. It may be more appropriate ( for clarity) to show SMP sites on a separate schematic in this section.

See map in section I. 2. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft F 9 II. SMP RESULTS 1. Introduction:

The SMP was conducted between November 2005 and August 2006. The following table presents the planned SMP sample dates, the actual dates when samples were collected, and the reason for the one deviation from the plan.

Actual SMP Sample Dates Planned Sample Date Actual Sample Date Explanation November 8, 2005 November 8, 2005 On schedule.

February 14, 2006 February 14, 2006 On schedule.

May 9, 2006 May 9, 2006 On schedule.

August 8, 2006 August 5, 2006 System maintenance was planned in the area of SMP site # 1 for the week of August 8 and was expected to require extensive system flushing, so SMP sampling was performed on the prior Friday.

2. Summary of IDSE SMP data and Stage 1 DBPR compliance data:

All DBP results from the SMP and concurrent Stage 1 DBPR compliance monitoring are presented in the following tables. The first table presents the TTHM and HAA5 results for the SMP sample sites and the second table presents the results for the Stage 1 DBPR compliance sampling for the period from February 2005 to August 2006.

Oak City IDSE SMP Monitoring Results SMP Sample Site TTHM ( µ g/ L) HAA5 ( µ g/ L)

Monitoring Results1 LRAA Monitoring Results1 LRAA # 1  Representative high TTHM ( Silver) 62, 71, 82, 85 75 21, 25, 26, 28 25 # 2  Representative high TTHM ( Blue) 49, 68, 72, 69 65 20, 21, 38, 28 27 # 3  Representative high HAA5 ( Silver) 33, 29, 41, 42 36 43, 52, 48, 38 45 # 4  Representative high HAA5 ( Blue) 35, 29, 37, 47 37 36, 40, 46, 40 41 1 Data obtained from sampling every 90 days are listed in order for November, February, May, and August ( as required for a ground water supply serving $ 10,000 people). Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft F 10 Oak City Stage 1 DBPR Monitoring Results Stage 1 DBPR Monitoring Site TTHM ( µ g/ L) HAA5 ( µ g/ L)

Monitoring Results1 LRAA Monitoring Results1 LRAA Maximum residence time # 1 45, 34, 56, 62 49 24, 32, 43, 45 36 Maximum residence time # 2 60, 68, 68, 98 74 42, 33, 30, 38 36 1 Data obtained from sampling every 90 days are listed in order for November, February, May, and August ( as required for a ground water supply serving $ 10,000 people).

III. PROPOSED STAGE 2B COMPLIANCE MONITORING SITES 1. Site Selection:

Two Stage 2B compliance sample sites were selected for each plant from the one Stage 1 DBPR site and two SMP sample sites per plant. The selections were based on the TTHM and HAA5 LRAAs. The sites with the highest LRAAs were selected, with one exception. The following tables rank the sites based on their TTHM and HAA5 LRAAs. The sites proposed as Stage 2B compliance sites are shaded in the tables. A schematic of the sites is presented in section III. 4.

Proposed Stage 2B Compliance Monitoring Sites Silver Plant Blue Pumping Station TTHM HAA5 TTHM HAA5 Site LRAA ( µ g/ L) Site LRAA ( µ g/ L) Site LRAA ( µ g/ L) Site LRAA ( µ g/ L)

SMP # 1 75 SMP # 3 45 SMP # 2 65 SMP # 4 41 Stg. 1# 2 74 Stg. 1# 2 36 Stg. 1# 1 49 Stg. 1# 1 36 SMP # 3 36 SMP # 1 25 SMP # 4 37 SMP # 2 27 Note: Bold text and shading identify proposed Stage 2 DBPR compliance sites.

2. Justification of Site Selections:

For the Silver Plant, the proposed site for highest TTHM is Stage 1 DBPR site # 2. This site had a LRAA nearly equal to the highest LRAA ( 74 vs. 75 µ g/ L at SMP # 1), had the highest single test result for TTHM ( 98 vs. 85 µ g/ L at SMP # 1), and had a higher HAA5 average than SMP # 1 ( 36 vs 25 µ g/ L). Continuing the use of the Stage 1 DBPR site will also allow the city to maintain a longer continuous historical record of TTHM concentrations at a single location. The proposed site for highest HAA5 is SMP # 3, which had the highest HAA5 LRAA of the three Silver Plant sample sites. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft F 11 For the Blue Pumping Station, the proposed site for highest TTHM is SMP # 2, since it had the highest TTHM average. The proposed site for highest HAA5 is SMP # 4, which had the highest HAA5 average.

3. Summary of Proposed Compliance Sites and Sampling Schedule:

Stage 2B Sample Site Site Description 1. Silver Plant Highest TTHM Old Stage 1 DBPR Site # 2 2. Silver Plant Highest HAA5 SMP Site # 3 3. Blue Pumping Station Highest TTHM SMP Site # 2 4. Blue Pumping Station Highest HAA5 SMP Site # 4 Dual sample set Stage 2B sampling is proposed to occur in March, June, August ( peak historical month for TTHM concentrations), and December. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft F 12 Pineville Oakville Elmville Weeping Willow Downtown Appleville Poplarville Cedarville Cypressville MIXING ZONE Blue Pumping Station ( seasonal source)

Silver Plant 1 2 2 Elevated Storage Tank Ground storage tank Pump station Booster disinfection station P P P P 4 3 Stage 2B highest HAA5 site Stage 2B highest TTHM site # # Oak City Distribution System 4. Map of Proposed Stage 2B Compliance Monitoring Sites: Appendix G IDSE SMP Report for Producing Surface Water Systems Serving 500  9,999 People This appendix is provided as an example IDSE report for producing surface water systems serving 500 to 9,999 people and opting to complete the Standard Monitoring Program ( SMP).

Chapter 6 presents the detailed SMP requirements for these systems, and Chapter 8 provides guidance on selecting SMP sites and Stage 2B compliance monitoring sites based on SMP results. Chapter 8 also presents the IDSE reporting requirements. The application of the basic guidance on SMP site selection and Stage 2 B compliance monitoring site selection is shown in this example, along with several instances of the use of best professional judgement being applied.

The italicized text within the appendix consists of comments and explanations and is not intended to represent the recommended content of an actual IDSE Report. This page intentionally left blank. Initial Distribution System Evaluation Report for Lakeside City PWSID Number: US0000000 Address: P. O. Box 1234 Lakeside City, US 22222 1234 Contact Person: Ms. Mary Smith, P. E.

Phone Number: 123 555 1111 Fax Number: 123 555 2222 Email Address: Msmith@ ci. lakeside. us System Type: Community, surface water Population Served: 3,000 This page intentionally left blank. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft G 1 I. SMP PLAN 1. System Description:

This section of the report should include a summary of typical system operating characteristics ( and how they change on a seasonal basis if appropriate) explaining how sources are used to meet system demands, where high water age is expected to occur, and any special aspects of operation that could affect DBP concentrations in the distribution system. Information about water treatment processes and source water quality data should also be in this section, including a brief description of the water treatment process train.

General System Characteristics: Service area: Lakeside City   the system serves an area within a three mile radius Production: Annual average daily demand 1 MGD Source Water Information: Deep Lake water quality data: pH: from 6.8 to 7.9 Alkalinity: from 77 to 94 mg/ L as CaCO3 TOC: from 1.6 to 4.4 mg/ L as C Entry points ( tied to source( s)) and identification of service area( s) under the influence of each entry point: ( Entry points should be tied to source( s) and typical flows noted)

Entry points: Deep Lake Plant Design Capacity = 2.5 mgd Average Daily Production = 1.0 mgd Treatment Provided:

Deep Lake Plant: alum coagulation, flocculation, sedimentation, and dual media filters. Disinfection: chlorine for both primary and secondary disinfection.

Description of distribution system:

Distribution system ( estimated length of lines and range of diameter): About 20 miles, 4"  12"

2 elevated tanks with total capacity of 0.5 MG Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft G 2 A pump station is located near the western storage tank ( most distant from the plant). This pump is primarily used during peak demands and low pressure situations. The pump is timed to turn on in the morning and evening during peak demand and when the pressure drops below 40 psi at a point downstream of the pump station.

The residence time of water in the distribution system is believed to average approximately 2 days, and ranges up to nearly 5 days. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft G 3 Deep Lake WTP 1 P Elevated Storage Tank P Pump Station 1 Stage 1 DBPR site SMP TTHM site SMP HAA5 site #

# 2 Big Industrial Park 2. Schematic drawing of the distribution system with SMP and Stage 1 DBPR sites: Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft G 4 3. SMP monitoring requirements:

The Lakeside City system serves approximately 3,000 people and has one surface water plant. Therefore, a total of 2 SMP sample sites are required by the Stage 2 DBPR to be sampled approximately every 90 days ( 2 dual sample sets per quarter).

Required SMP Sample Sites SMP Site Type Number of Sites Representative of high TTHM 1 Representative of high HAA5 1 Available Data:

Report all data that helped in sample site selection. If you have bromide, TOC, or HPC data, these may be helpful for justifying Stage 2B site selection. For this example, only limited tables are presented with data for Stage 1 DBPR sample sites and the sites chosen as SMP sample locations. Your report should include data for all sites that were considered as candidates for SMP sites.

Chlorine residual information was available for Total Coliform Rule sample sites, the Stage 1 DBPR sample site, and the operational sample site. In addition, HPC data was available for Total Coliform Rule sample sites. The following table presents these data, with the selected SMP sample sites numbered and their type identified for reference. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft G 5 Table G. 1 Lakeside Distribution System   Free Chlorine Residual Data Sample Site ID # SMP Site # SMP Site Type Free Chlorine Residual ( mg/ L)

7/ 04 8/ 04 9/ 04 10/ 04 11/ 04 12/ 04 1/ 05 2/ 05 3/ 05 4/ 05 5/ 05 6/ 05 7/ 05 8/ 05 9/ 05 10/ 05 Stg. 1 0.14 0.32 0.68 0.63 0.20 0.45 Oper. # 1 1.5 1.5 1.4 1.2 1.1 1.2 1.1 1.1 1.2 1.2 1.4 1.4 1.4 1.5 1.3 1.2 TCR # 3 1 T 0.12 0.10 0.22 0.34 0.44 0.48 0.65 0.62 0.59 0.65 0.62 0.24 0.23 0.25 0.39 0.44 TCR # 2 2 H 0.41 0.42 0.46 0.51 0.58 0.48 0.70 0.60 0.72 0.61 0.54 0.42 0.42 0.40 0.47 0.51 TCR # 1 0.32 0.35 0.42 0.54 0.75 0.66 0.82 0.70 0.70 0.91 0.55 0.46 0.36 0.35 0.40 0.64 TCR  Total Coliform Rule T  Representative High TTHM Stg. 1  Stage 1 DBPR H  Representative High HAA5 Oper.  Operational sample Table G. 2 Lakeside Distribution System   Heterotrophic Plate Counts ( HPC)

Sample Site ID# SMP Site # SMP Site Type HPC ( cfu/ mL)

7/ 04 10/ 04 1/ 05 4/ 05 7/ 05 10/ 05 Stg. 1 468 223 76 72 423 98 Oper. # 1 0 0 0 0 0 0 TCR # 3 1 T 540 202 85 67 342 102 TCR # 2 2 H 97 75 23 31 98 59 TCR # 1 95 53 15 19 76 48 TCR  Total Coliform Rule T  Representative High TTHM Stg. 1  Stage 1 DBPR H  Representative High HAA5 Oper.  Operational sample Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft G 6 4. Summary of the selected SMP sample sites:

Present the rationale for the selection of the SMP sample sites in your system, as well as a schematic showing their locations within the distribution system.

The system has only one source. Therefore, a total of two SMP monitoring sites are required by the Stage 2 DBPR. Each monitoring site is marked on the map of the distribution system ( see section I. 2). Residual chlorine and HPC data from the TCR and operational monitoring sites ( see Tables G. 1 and G. 2) were considered in the selection of the SMP monitoring sites.

SMP Site # 1   Chosen to represent high TTHM levels. This monitoring site is located in the vicinity of TCR sample site # 3, and before the last group of connections in proximity to the end of the distribution system. At this site, water demand tends to be low, chlorine residuals are often very low ( less than 0.5 mg/ L) and heterotrophic plate counts are often higher than 100 cfu/ mL.

SMP Site # 2   Chosen to represent high HAA5 levels. Sample tap is a hose bib at an elementary school located in a zone of the distribution system with water age greater than average. Chlorine residual at this site is never below 0.4 mg/ L ( range is between 0.4 and 0.7 mg/ L), and the heterotrophic plate count is consistently below 100 cfu/ mL throughout the year.

5. SMP sample schedule:

Because the quarterly Stage 1 DBPR monitoring is the only DBP monitoring that has been performed in the Lakeside City system, historic DBP data are available for only the months of February, May, August, and November. August has regularly had the highest DBP levels. No other DBP data are available for any other months of the year, so water temperature data from TCR sample sites were also reviewed to see which month of the year had the warmest water temperature. Our review of 3 years of temperature data showed that distribution system water was warmest in August. Therefore, based on the agreement of the water temperature and TTHM and HAA5 monitoring results, we concluded that August is the controlling month for the Lakeside City distribution system. The following table summarizes our planned SMP sample dates, which are based on sampling on the second Monday of the month. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft G 7 Proposed SMP Sample Schedule Planned Sample Date November 13, 2007 February 12, 2008 May 14, 2008 August 13, 2008 Dual sample sets will be collected from each of the 2 SMP sample sites on or close to the listed dates and analyzed for TTHM and HAA5 by a State certified laboratory. Stage 1 DBPR compliance samples will be collected on the same days. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft G 8 II. SMP Results 1. Introduction The SMP was conducted between November 2007 and August 2008. The following table presents the planned SMP sample dates, the actual dates when samples were collected, and the reason for the one deviation from the plan.

Actual SMP Sample Schedule Planned Sample Date Actual Sample Date Explanation November 13, 2007 November 13, 2007 On schedule.

February 12, 2008 February 12, 2008 On schedule.

May 14, 2008 May 14, 2008 On schedule August 13, 2008 August 17, 2008 One of the sample bottles broke from the August 10 sampling, so re sample was performed 4 days later.

2. Summary of IDSE SMP data and Stage 1 DBPR compliance data.

All DBP results from the SMP and concurrent Stage 1 DBPR compliance monitoring are presented in the following two tables. The first table presents the TTHM and HAA5 results for the SMP sample sites and the second table presents the results for the Stage 1 DBPR compliance sampling for the period from November 2007 to August 2008.

Lakeside City IDSE SMP Monitoring Results SMP Sample Site TTHM ( µ g/ L) HAA5 ( µ g/ L)

Monitoring Results1 LRAA Monitoring Results1 LRAA # 1  Representative high TTHM 63, 53, 78, 89 71 21, 25, 32, 41 30 # 2  Representative high HAA5 38, 32, 48, 56 44 43, 49, 53, 63 52 1 Data obtained from sampling every 90 days ( as required for surface water supplies serving 500 9,999 people) are listed in order for November, February, May, and August. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft G 9 Lakeside City Stage 1 DBPR Monitoring Results SMP Sample Site TTHM ( µ g/ L) HAA5 ( µ g/ L)

Monitoring Results1 Avg Monitoring Results1 Avg Maximum residence time 56, 49, 79, 95 70 25, 30, 36, 51 36 3. Proposed Stage 2B Compliance Sites and Schedule:

Two Stage 2B compliance sample sites were selected from among the one Stage 1 DBPR and two SMP sample sites. The selections were based on the TTHM and HAA5 LRAAs. The following table ranks the sites based on their TTHM and HAA5 LRAAs. The sites proposed as Stage 2B compliance locations are shaded in the table.

Proposed Stage 2 B Compliance Sites TTHM HAA5 Site LRAA ( µ g/ L) Site LRAA ( µ g/ L)

SMP # 1 71 SMP # 2 52 Stage 1 70 Stage 1 36 SMP # 2 44 SMP # 1 30 Note: Bold text and shading identify proposed Stage 2B compliance sites.

The proposed highest HAA5 site is SMP # 2, which had the highest LRAA of the three sample locations. The proposed highest TTHM site is the Stage 1 DBPR site. This site had an LRAA nearly equal to the highest LRAA ( 70 vs. 71 µ g/ L at SMP # 1), and had the highest single test result for TTHM ( 95 vs. 89 µ g/ L at SMP # 1). It also had a higher HAA5 LRAA than SMP # 1 ( 36 vs. 30 µ g/ L). Continuing to use the Stage 1 DBPR site will also allow the city to maintain a continuous historical record of TTHM concentrations at a single location.

Dual sample set Stage 2 B sampling is proposed to occur in March, June, August ( peak historical month for TTHM concentrations), and December. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft G 10 Elevated Storage Tank P Pump Station Stage 2 high HAA5 site Stage 2 high TTHM site Deep Lake WTP P Big Industrial Park 4. Schematic drawing of the distribution system with Stage 2B sites: Appendix H IDSE Report for Producing Ground Water Systems Serving < 10,000 People This appendix is provided as an example IDSE report for producing ground water systems serving less than 10,000 people and opting to complete the Standard Monitoring Program ( SMP).

Chapter 7 presents the detailed SMP requirements for these systems, and Chapter 8 provides guidance on selecting SMP sites and Stage 2B compliance monitoring sites based on SMP results. Chapter 8 also presents the IDSE reporting requirements. The application of the basic guidance on SMP site selection and Stage 2B compliance monitoring site selection is shown in this example, along with several instances of the use of best professional judgement being applied.

The italicized text within the appendix consists of comments and explanations and is not intended to represent the recommended content of an actual IDSE Report. This page intentionally left blank. Initial Distribution System Evaluation Report for Greenspring City PWSID Number: US0000000 Address: P. O. Box 1234 Greenspring City, US 11111 1234 Contact Person: Ms. Jennifer Smith, P. E.

Phone Number: 123 555 9876 Fax Number: 123 555 9877 Email Address: Jsmith@ ci. greenspring. us System Type: Community, ground water Population Served: 1,500 This page intentionally left blank. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft H 1 I. SMP PLAN 1. System Description:

This section of the report should include a summary of typical system operating characteristics ( and how they change on a seasonal basis if appropriate) explaining how sources are used to meet system demands, where high water age is expected to occur, and any special aspects of operation that could affect DBP concentrations in the distribution system. Information about water treatment processes and source water quality data should also be in this section, including a brief description of the water treatment process train.

General system characteristics: Service area: All of Greenspring City   an area of approximately 4 square miles Production: Annual average daily demand  250,000 gpd Source water information: Greenspring Wellfield water quality data: pH typically ranges from 6.8  7.5 Alkalinity averages 185 mg/ L as CaCO 3 TOC averages 1.5 mg/ L as C Entry points ( tied to source and identification of service area under influence of each): ( Entry points should be tied to source( s) and typical flows noted)

Green Hill Water Plant located at Greenspring Wellfield   the only entry point, feeds entire distribution system Design Capacity = 1.0 mgd Average Daily Production = 0.25 mgd Treatment provided: Green Hill Water Plant adds chlorine for primary and secondary disinfection Description of distribution system: Distribution system ( estimated length of lines and range of diameter): About 7 miles, 4"  12"

Number of storage tanks and total storage capacity: 1 ground tank at the Green Hill water plant ( 0.05 MG) and 1 elevated tank ( 0.25 MG)

The average residence time of water in the distribution system is believed to be 1 day, and may range up to nearly 3 days at the ends of the system. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft H 2 Elevated Storage Tank Stage 1 DBPR site SMP TTHM site SMP HAA5 site #

# Green Hill Water Plant 1 1 2 2. Schematic of the distribution system: Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft H 3 3. SMP monitoring requirements:

The Greenspring City system serves approximately 1,500 people. This is a ground water system, served by one aquifer. Therefore, for the IDSE, a total of 2 SMP sample sites must be sampled approximately every six months ( 2 dual sample sets every six months).

SMP Site Requirements Site Criteria Number of Sample Sites Representative high TTHM 1 Representative high HAA5 1 Available Data:

Report all data that helped in sample site selection. For this example, only tables with limited data are presented for Stage 1 DBPR sample sites and the sites chosen as SMP sample locations. If you have bromide, TOC and/ or HPC data, these may be helpful for justifying Stage 2B site selection. Your report should include data for all sites that were considered as SMP sites.

Chlorine residual was available for the system's two Total Coliform Rule sample sites, the Stage 1 DBPR sample site, and the operational sample site. The following table presents these data, with SMP site numbers and types provided for those sites chosen for SMP monitoring. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft H 4 Table H. 1 Greenspring Distribution System   Chlorine Residual Data Sample Site ID # SMP Site # SMP Site Type Free Chlorine Residual ( mg/ L)

1/ 03 2/ 03 3/ 03 4/ 02 5/ 03 6/ 03 7/ 03 8/ 03 9/ 03 10/ 03 11/ 03 12/ 03 1/ 04 2/ 04 3/ 03 4/ 04 5/ 04 6/ 04 7/ 04 8/ 04 9/ 04 10/ 04 11/ 04 12/ 04 Stg 1 0.25 0.28 TCR # 2 1 TTHM 0.61 0.63 0.59 0.38 0.37 0.25 0.21 0.23 0.22 0.34 0.44 0.48 0.65 0.62 0.59 0.61 0.62 0.24 0.23 0.25 0.39 0.44 0.49 0.53 Avg. 2 HAA5 N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A TCR # 1 0.73 0.68 0.55 0.42 0.42 0.40 0.41 0.42 0.46 0.51 0.58 0.48 0.70 0.60 0.72 0.61 0.54 0.42 0.42 0.40 0.47 0.51 0.56 0.48 FW 1.3 1.0 1.2 1.2 1.4 1.5 1.5 1.6 1.4 1.2 1.1 1.1 1.2 1.1 1.3 1.4 1.4 1.4 1.5 1.5 1.4 1.2 1.1 1.0 TCR  Total Coliform Rule Stg. 1  Stage 1 DBPR FW  Finished Water ( operational sample site) Avg  Average Residence Time ( operational sample site) Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft H 5 4. Summary of selected SMP sample sites:

Present the rationale for the selection of the SMP sample sites in your system, as well as a schematic showing their locations within the distribution system.

SMP Site # 1   Chosen to represent high TTHM levels. This is TCR site # 2. This site is at the end of the distribution system, before the last significant group of connections, at a hose bib at the town library. It is located near TCR monitoring site # 1, downstream of the storage tank, and before the last group of connections in proximity to the end of the distribution system. At this site, chlorine residuals are often very low ( less than 0.5 mg/ L). This site also represents high residence time within the distribution system.

SMP Site # 2   Chosen to represent high HAA5 levels. This site is a hose bib at an elementary school located in a zone of the distribution system with water age greater than average ( based on operators' knowledge of the distribution system) but less than that of SMP # 1. Free chlorine is not routinely monitored at this site. However, this site is expected to have higher chlorine residual than the TTHM SMP site, and therefore less potential for biodegradation. This site was also chosen to provide good geographical representation of the distribution system ( although TCR # 1 had free chlorine data, it was physically too close to SMP # 1 to be considered).

5. SMP sample schedule:

Because the yearly Stage 1 DBPR monitoring is the only DBP monitoring that has been performed in the Greenspring system, historic DBP data are available for only the month of August. No other DBP data are available for any other months of the year, so water temperature data were also reviewed to see which month of the year had the warmest water temperature. Our review of 3 years of finished water temperature data from TCR sample sites showed that distribution system water was warmest in August. Therefore, based on the agreement of the water temperature and TTHM and HAA5 monitoring results, we concluded that August is the controlling month for the Greenspring City distribution system. The following table summarizes our planned SMP sample dates and is based on sampling on the second Monday of the month.

Proposed SMP Sample Schedule Planned Sample Date February 12, 2008 August 13, 2008 Dual sample sets will be collected from each of the 2 SMP sample sites on or close to the Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft H 6 listed dates and analyzed for TTHM and HAA5 by a State certified laboratory. Stage 1 DBPR compliance samples will be collected on the same days.

II. SMP RESULTS 1. Introduction:

The SMP was conducted in February and August 2008. The following table presents the planned SMP sample dates, the actual dates when samples were collected, and the reason for the one deviation from the plan.

Actual SMP Sample Schedule Planned Sample Date Actual Sample Date Explanation February 12, 2008 February 13, 2008 Sampler was sick on 2/ 12/ 08 August 13, 2008 August 13, 2008 On schedule 2. Summary of IDSE SMP data and Stage 1 DBPR compliance data.

All DBP results from the SMP and concurrent Stage 1 DBPR compliance monitoring are presented in the following two tables. The first table presents the TTHM and HAA5 results for the SMP sample sites and the second table presents the results for the Stage 1 DBPR compliance sampling for the period from February 2008 to August 2008.

Greenspring City SMP Monitoring Results SMP Sample Site TTHM ( µ g/ L) HAA5 ( µ g/ L)

2/ 08 8/ 08 LRAA 2/ 08 8/ 08 LRAA # 1  Representative high TTHM 35 73 54 22 50 36 # 2  Representative high HAA5 25 55 40 23 49 36 Note: Bold text and shading identify proposed Stage 2B compliance sites. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft H 7 Greenspring City Stage 1 DBPR Monitoring Results Stage 1 DBPR Sample Site TTHM ( µ g/ L) HAA5 ( µ g/ L)

2/ 08 8/ 08 LRAA 2/ 08 8/ 08 LRAA Maximum Residence Time 47 63 55 22 44 33 Note: Bold text and shading identify proposed Stage 2B compliance sites.

3. Proposed Stage 2B Compliance Sites and Schedule:

Stage 2B compliance sample sites were selected from among the two SMP sample sites and one Stage 1 DBPR site. The selections were based on the LRAAs for TTHM and HAA5.

Proposed Stage 2B Compliance Sites Stage 2B Site Number Site Type Location Description 1 Highest TTHM Stage 1 DBPR # 1 2 Highest HAA5 SMP # 1 The proposed site for high TTHM is the Stage 1 DBPR site, which had an LRAA of 55 µ g/ L. The highest HAA5 LRAA occurred at both SMP # 1 and SMP # 2. The HAA5 values during the peak temperature months were similar for these two sites. Because SMP # 1 has a higher TTHM LRAA than SMP # 2, it was chosen as the second Stage 2B compliance monitoring site. Dual sample set Stage 2B sampling is proposed to occur in February and August ( the peak historical month for TTHM concentrations). Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft H 8 Elevated Storage Tank Stage 2 high TTHM site Green Hill Water Plant #

# Stage 2 high HAA5 site 1 2 4. Schematic of the distribution system with Stage 2B sites: Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft H 9 This page intentionally left blank. Appendix I IDSE SMP Report for Producing Surface Water Systems Serving < 500 People This appendix is provided as an example IDSE report for producing surface water systems serving less than 500 people and opting to complete the Standard Monitoring Program ( SMP).

Chapter 7 presents the detailed SMP requirements for these systems, and Chapter 8 provides guidance on selecting SMP sites and Stage 2B compliance monitoring sites based on SMP results. Chapter 8 also presents the IDSE reporting requirements. The application of the basic guidance on SMP site selection and Stage 2B compliance monitoring site selection is shown in this example, along with several instances of the use of best professional judgement being applied.

The italicized text within the appendix consists of comments and explanations and is not intended to represent the recommended content of an actual IDSE Report. This page intentionally left blank. Initial Distribution System Evaluation Report for Riverdale PWSID Number: US0000000 Address: P. O. Box 1234 Riverdale, US 22222 1234 Contact Person: Mr. John Jones, P. E.

Phone Number: 123 555 1111 Fax Number: 123 555 2222 Email Address: JJones@ ci. riverdale. us System Type: Community ground water under direct influence Population Served: 300 This page intentionally left blank. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft I 1 I. SMP PLAN 1. System Description:

This section of the report should include a summary of typical system operating characteristics ( and how they change on a seasonal basis if appropriate) explaining how sources are used to meet system demands, where high water age is expected to occur, and any special aspects of operation that could affect DBP concentrations in the distribution system.

Information about water treatment processes and source water quality data is also part of this section, including a description of water treatment trains. General information about residence times within the distribution system should also be included, if available.

General System Characteristics: Service area: Riverdale Production: Annual average daily demand 40,000 gpd Source Water Information: Green Meadows spring: pH: from 6.8 to 7.9 Alkalinity: from 77 to 94 mg/ L as CaCO3 TOC: from 1.6 to 2.4 mg/ L as C Entry points ( tied to source( s)) and identification of service area( s) under the influence of each entry point: Entry points: Green Meadows well field Treatment Provided: Green Meadows well field: Direct filtration Primary and residual disinfection: Chlorine/ chlorine Description of distribution system: Distribution system ( estimated length of lines and range of diameter): About 1 mile, 4"  6"

1 standpipe with total capacity of 50,000 gallons Riverdale did not receive a very small system waiver from the State because the standpipe, which is used to maintain system pressure in the western half of the system, was considered oversized and may contribute to excessive residence times in the tank. Chlorine residual measurements in the tank show that it may be operating in a last in/ first out mode, and water at Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft I 2 Green Meadows Well Field 1 1 2 Elevated Storage Tank Stage 1 DBPR site SMP TTHM site SMP HAA5 site #

# the top of the tank may be much older than water in the bottom of the tank. Furthermore, the Green Meadows spring is situated in the center of the Riverdale system, while the Stage 1 DBPR monitoring site is located on the east side of the system. The State suggested that the western half of the system be monitored, upstream and downstream of the storage tank.

The residence time of water in the distribution system is thought to average approximately 1 day, but is probably higher near the standpipe.

2. Schematic drawing of the distribution system: Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft I 3 3. SMP monitoring requirements:

The Riverdale system serves approximately 300 people. This is a system using ground water under the direct influence of surface water and is served by one plant. Therefore, a total of 2 SMP sample sites are required by the Stage 2 DBPR to be sampled approximately every six months ( 2 dual sample sets every six months).

SMP Site Requirements Site Criteria Number of Sample Sites Representative high TTHM 1 Representative high HAA5 1 Available Data:

Provide all data that helped in site selection. You can include are data from Stage 1 DBPR, Total Coliform Rule, and operational sample sites ( any site not used for rule compliance). You should also provide residence times in the distribution system, if known. If you have bromide, TOC, or HPC data, these may be helpful for justifying your Stage 2B site selection. Your report should include data for all sites that were considered as candidates for SMP locations.

Chlorine residual information was available at Total Coliform Rule and operational sample sites. A summary of chlorine residual data in the distribution system is presented in Table I. 1. The chlorine residual results from a study of water flow through the storage tank are shown in Table I. 2. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft I 4 Table I. 1 Riverdale Distribution System   Chlorine Residual Data Sample Site ID Chlorine Residual ( mg/ L)

1/ 05 2/ 05 3/ 05 4/ 05 5/ 05 6/ 05 7/ 05 8/ 05 9/ 05 10/ 05 11/ 05 12/ 05 1/ 06 2/ 06 3/ 06 4/ 06 5/ 06 6/ 06 7/ 06 8/ 06 9/ 06 10/ 06 11/ 06 12/ 06 WF # 1 1.3 1.0 1.2 1.2 1.4 1.5 1.5 1.6 1.4 1.2 1.1 1.1 1.2 1.1 1.3 1.4 1.4 1.4 1.5 1.5 1.4 1.2 1.1 1.0 TCR # 1 0.71 0.62 0.59 0.41 0.37 0.27 0.23 0.21 0.23 0.35 0.43 0.48 0.63 0.62 0.58 0.62 0.61 0.31 0.25 0.24 0.41 0.44 0.51 0.62 WF  Wellfield finished water TCR  Total Coliform Rule Table I. 2 Riverdale Distribution System   Chlorine Residual Data at Storage Tank Water Depth1 Test 1 Test 2 Test 3 Average 1 ft from top ND ND ND ND 3 ft from top ND 0.1 0.1 0.10 5 feet from top/ bottom 0.2 0.3 0.2 0.23 3 ft from bottom 0.7 0.9 0.8 0.80 1 ft from bottom 1.1 1.0 1.1 1.07 1 This is a 50 ft tall standpipe. Note: Data collected in July 2004. ND  Non Detect Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft I 5 4. Summary of selected IDSE SMP sites:

Present the rationale for the selection of SMP sample sites in your system, as well as a schematic showing their location within the distribution system.

A description of the two SMP sites proposed for the Riverdale distribution system is given here. Each site is shown on a map of the distribution system in section I. 2.

SMP Site # 1   Chosen to represent high TTHM levels. This site is located downstream of the standpipe on the western edge of town. It is located before the last group of connections in proximity to the end of the distribution system. Because water with high residence time from the upper portions of the tank is thought to be occasionally drawn into the distribution system during peak demand periods, this site has the potential for high TTHM levels.

SMP Site # 2   Chosen to represent high HAA5 levels. This site is a hose bib located upstream ( prior to) of the storage tank on the western edge of the system. This site has average residence time within the distribution system, and chlorine residual is expected to be adequate ( greater than 0.5 mg/ L) to prevent biodegradation.

5. SMP Sample Schedule:

Annual Stage 1 DBPR monitoring is the only DBP monitoring that has been performed in the Riverdale system. As a result historic DBP data are available for only the month of August. DBP data is not available for any other months of the year, so water temperature data were reviewed to see which month of the year had the warmest water temperature. Our review of three years of finished water temperature data from the TCR sample site showed that distribution system water was warmest in August. Therefore, we concluded that August is the controlling month for the Riverdale distribution system. The following table summarizes our planned SMP sample dates and is based on sampling on the second Monday of the required month.

Proposed SMP Sample Schedule Planned Sample Date February 12, 2008 August 13, 2008 Dual sample sets will be collected from each of the 2 SMP sample sites on or close to the listed dates and analyzed for TTHM and HAA5 by a State certified laboratory. Stage 1 DBPR compliance samples will be collected on the same day in August. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft I 6 II. SMP RESULTS 1. Introduction:

The SMP was conducted in February and August 2008. The following table presents the planned SMP sample dates, the actual dates when samples were collected, and the reason for the one deviation from the plan.

Actual SMP Sample Schedule Planned Sample Date Actual Sample Date Explanation February 12, 2008 February 13, 2008 A blizzard prevented the operator from getting to the monitoring sites on February 12.

August 13, 2008 August 13, 2008 On schedule.

2. Summary of IDSE SMP data and Stage 1 DBPR compliance data:

All DBP results from the SMP and concurrent Stage 1 DBPR compliance monitoring are presented in the following table. The table presents the TTHM and HAA5 results for the SMP sample sites and the Stage 1 DBPR compliance site.

Riverdale SMP and Stage 1 DBPR Monitoring Results Monitoring Site TTHM ( µ g/ L) HAA5 ( µ g/ L)

2/ 08 8/ 08 LRAA 2/ 08 8/ 08 LRAA SMP Site # 1  Representative high TTHM 45 82 64 18 32 25 SMP Site # 2  Representative high HAA5 33 65 49 20 35 28 Stage 1 Maximum residence time N/ A 78 N/ A N/ A 45 N/ A Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft I 7 III. PROPOSED STAGE 2B COMPLIANCE MONITORING SITES This section of the report should include a summary of your proposed Stage 2B monitoring sites including a schematic of the distribution system showing their locations, a discussion of the rationale for your selection of those sites, and a proposed monitoring schedule.

Stage 2B compliance sample sites were selected from the two SMP sample sites and the Stage 1 DBPR site. The selections were based on a comparison of the average TTHM and HAA5 values at the SMP sites and the August results for all three sites ( two SMP and one Stage 1 DBPR sites). The following tables rank the sites based on their average TTHM and HAA5 values. The sites proposed as Stage 2B compliance sites are in bold text and shaded in the table. A schematic of the monitoring sites is presented in section III. 2.

Proposed Stage 2B Compliance Monitoring Sites TTHM HAA5 Site LRAA ( µ g/ L) August results ( µ g/ L) Site LRAA ( µ g/ L) August results ( µ g/ L SMP # 1 64 82 Stage 1 N/ A 45 Stage 1 N/ A 78 SMP # 2 28 35 SMP # 2 49 65 SMP # 1 25 32 Bold text and shading identifies proposed Stage 2B compliance monitoring sites.

The proposed highest TTHM site is SMP # 1. Of the three locations, SMP # 1 has the highest average TTHM value as well as highest TTHM value during the peak temperature month ( August).

The proposed highest HAA5 site is the Stage 1 DBPR site. This site has the highest August HAA5 value of the three sites.

Stage 2B sampling is proposed to occur in August ( peak historical month for TTHM concentrations). TTHM samples will be collected at SMP # 1 only, and HAA5 will be collected at the Stage 1 site only. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft I 8 Elevated Storage Tank Stage 2B High HAA5 Stage 2B High TTHM Green Meadows Well Field 2. Schematic drawing of the distribution system with Stage 2 DBPR sites: Appendix J IDSE SMP Report for a 100 Percent Purchasing Surface Water System This appendix is provided as an example IDSE report for surface water systems purchasing 100 percent of their water, serving 100,000  499,999 people, and opting to complete the Standard Monitoring Program ( SMP).

Chapter 5 presents the detailed SMP requirements for these systems, and Chapter 8 provides guidance on selecting SMP sites and Stage 2B compliance monitoring sites based on SMP results. Chapter 8 also presents the IDSE reporting requirements. The application of the basic guidance on SMP site selection and Stage 2B compliance monitoring site selection is shown in this example, along with several instances of the use of best professional judgement being applied.

The italicized text within the appendix consists of comments and explanations and is not intended to represent the recommended content of an actual IDSE Report. This page intentionally left blank. Initial Distribution System Evaluation Report for Grove City PWSID Number: US1111111 Address: 1234 Main Street Grove City, US 99999 Contact Person: Ms. Margaret Doe, P. E.

Phone Number: 123 555 0000 Fax Number: 123 555 0001 Email Address: MDoe@ ci. grovecity. us System Type: Community, 100 % purchased SW Population Served: 160,000 This page intentionally left blank. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 1 I. SMP PLAN 1. System Description:

This section of the report should include a summary of typical system operating characteristics ( and how they change on a seasonal basis if appropriate) explaining how sources are used to meet system demands, where high water age is expected to occur, and any special aspects of operation that could affect DBP concentrations in the distribution system.

General system characteristics: Service area: Grove City plus surrounding suburban areas Production: Annual average daily demand 15 MGD Source Water Information:

The wholesalers do not provide us with raw water quality data, but our purchasing agreements require water quality at our city's entry points to meet State and federal drinking water quality standards.

Entry points and service areas under the influence of each entry point: ( Entry points should be tied to source( s) and typical flows noted)

Entry points: Purchase approximately 50 percent ( 7.5 mgd average) from Big City Purchase remaining 50 percent ( 7.5 mgd average) from New City Both sources provide treated surface water and are used year round.

Customers located in the Cypressville, Cedarville, Poplarville, and north downtown generally receive water from Big City Customers located in the Industrial Park area, Oakville, Pineville, and south downtown generally receive water from New City Customers located in the Weeping Willow Community, Appleville, and central downtown generally receive a mixture of water from both plants Treatment Provided: Big City   conventional treatment followed by UF New City   conventional treatment Primary and residual disinfection: chlorine/ chloramines at both sources. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 2 Description of distribution system: Distribution system ( estimated length of lines and range of diameter): About 400 miles, 4"  56" ( approximately 20 MG carrying capacity)

5 storage tanks of 10 MG total capacity 1 ground tank 4 MG capacity 4 elevated tanks 6 MG total capacity ( 1.5 MG each)

The average residence time of water in the distribution system is six to eight days.

Pump stations: Station # 1 is located at the ground storage tank ( in Pineville). This pump is primarily used during peak demands and low pressure situations. The pump is timed to turn on in the morning and evening during peak demand, and when the pressure drops below 40 psi at a point downstream of the pump station.

Stations # 2 and # 3. These pumps are used to boost system pressure when the pressure in the areas downstream of these pumps ( Poplarville and Weeping Willow, respectively) drops below 40 psi.

Booster chloramination facilities: Facility # 1 is located on Cherry Hill Ave. ( downstream of the Cherry Hill storage tank at pump station # 3 in Weeping Willow). This facility is occasionally used during the summer when remote locations downstream of the booster chloramination facility lose total chlorine residual.

Facility # 2 is located at the intersection of Second Ave. and 11th St. ( in a mixing zone) in an area of the distribution system where total chlorine residuals are frequently low. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 3 Poplarville Big City Purchased Water Entry Point New City Purchased Water Entry Point Elevated Storage Tank Ground storage tank Pump station Chlorine Booster Station Appleville Weeping Willow Oakville Pineville Cedarville Cypressville Downtown Industrial Park PS2 CB2 PS3 CB1 PS1 Grove City Water Distribution System Apple Drive EST Jackson EST Cherry Hill EST Pineville GST East EST 2. Schematic drawing of the distribution system: Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 4 3. SMP monitoring requirements:

The Grove City system serves 160,000 people and purchases only surface water. Therefore, a total of 24 SMP sample sites are required to be sampled approximately every 60 days for one year ( 6 dual sample sets per site) for TTHM and HAA5.

Required SMP Sample Sites Site Criteria Number of Sample Sites Near entry to the distribution system 21 Average residence time 6 Representative of high HAA5 7 Representative of high TTHM 9 1 The Stage 2 rule requires 4 near entry point SMP sites for our size of system. However, because we only have two consecutive entry points, the other two were divided among high TTHM and HAA5 sites.

Available Data:

Report all data that helped in site selection. For this example, tables are presented with limited data for Stage 1 DBPR sample sites and the sites chosen as SMP sample locations. Your report should include data for all sites that were considered as candidates for SMP sites. If you have bromide, TOC, or HPC data, these may be helpful for justifying Stage 2B site selections.

Total chlorine residual and HPC data were available at our Total Coliform Rule and Stage 1 DBPR sample sites. The chlorine data for the summer months of June, July, August, and September were reviewed, and monthly averages and an overall average were calculated. These data are presented in Table J. 1. The SMP sample site numbering and type are also provided for reference.

Quarterly HPC data were available for the same year and at the same sites as the total chlorine data. The four results for each site were averaged. The monthly results and overall average values are presented in Table J. 2. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 5 Table J. 1 Grove City Distribution System   Total Chlorine Residual Data Sample Site ID # Source/ Plant Stage 1 Type SMP Site # SMP Type Total Chlorine Residual ( mg/ L)

June July Aug. Sept. Mean TCR # 9 NC 1 E 3.6 3.4 3.5 3.6 3.5 TCR # 11 NC 2 A 2.9 2.7 3.2 2.4 2.5 TCR # 22 NC 3 A 2.3 2.1 2.3 2.4 2.3 TCR # 3 NC 4 A 2.4 2.7 2.3 2.5 2.5 TCR # 46 NC 5 H 2.1 1.7 1.9 2.0 1.9 TCR # 5 NC 6 H 1.0 1.2 1.1 1.0 1.1 TCR # 6 NC 7 H 1.8 1.6 1.6 1.6 1.7 TCR # 78 NC 8 T 0.9 0.9 1.2 0.9 1.0 TCR # 81 NC 9 T 1.0 1.1 1.3 1.1 1.1 TCR # 39 NC 10 T 1.7 1.8 1.7 1.7 1.7 TCR # 10 NC 11 T 0.6 0.6 0.9 0.6 0.7 TCR # 1 BC 12 E 3.4 3.2 3.7 2.9 3.3 TCR # 86 BC 13 A 2.1 2.1 2.4 2.0 2.2 TCR # 21 BC 14 A 2.0 1.8 2.0 1.9 1.9 TCR # 35 BC 15 A 2.2 1.9 2.5 2.3 2.2 TCR # 13 BC 16 H 2.0 2.3 1.9 2.4 2.2 TCR # 49 BC 17 H 1.5 1.2 1.8 1.6 1.5 TCR # 65 BC 18 H 1.9 2.2 1.8 2.3 2.1 TCR # 16 MIX 19 T 2.5 2.6 2.8 2.9 2.7 TCR # 51 BC 20 T 0.9 1.3 0.9 1.0 1.0 TCR # 72 MIX 21 T 1.9 2.0 1.9 1.9 1.9 TCR # 71 MIX 22 H 2.0 1.8 1.6 1.7 1.8 TCR # 20 MIX 23 T 0.7 1.1 0.7 0.8 0.8 TCR # 58 MIX 24 T 0.5 0.6 0.8 0.6 0.6 Stg. 1 # 1 BC Avg 2.2 2.5 2.4 2.7 2.5 Stg. 1 # 2 BC Avg 2.1 2.2 2.7 2.3 2.3 Stg. 1 # 3 MIX Avg 1.6 1.7 1.7 1.9 1.7 Stg. 1 # 4 BC Max 0.8 1.1 0.7 0.8 0.9 Stg. 1 # 5 NC Avg 2.5 2.6 2.5 2.0 2.4 Stg. 1 # 6 NC Avg 2.4 2.2 2.7 2.5 2.5 Stg. 1 # 7 MIX Avg 1.4 2.0 1.7 2.0 1.8 Stg. 1 # 8 NC Max 0.7 1.7 0.8 1.4 1.0 MIX  Mixing Zone TCR  Total Coliform Rule E  Near Entry Point NC  New City Source Stg. 1  Stage 1 DBPR A  Average Residence Time BC  Big City Source T  Representative High TTHM H  Representative High HAA5 Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 6 Table J. 2 Grove City Distribution System   Heterotrophic Plate Count ( HPC) Data Sample Site ID # Source/ Plant Stage 1 Type SMP Site # SMP Type HPC ( cfu/ mL)

June July Aug. Sept. Mean TCR # 9 NC 1 E 12 8 34 12 17 TCR # 11 NC 2 A 78 86 384 364 228 TCR # 22 NC 3 A 35 62 147 92 84 TCR # 3 NC 4 A 43 34 156 224 114 TCR # 46 NC 5 H 34 76 97 89 74 TCR # 5 NC 6 H 54 65 87 97 76 TCR # 6 NC 7 H 35 43 64 45 47 TCR # 78 NC 8 T 68 175 399 375 254 TCR # 81 NC 9 T 151 273 164 354 235 TCR # 39 NC 10 T 43 67 125 102 84 TCR # 10 NC 11 T 156 278 169 359 240 TCR # 1 BC 12 E 67 14 35 42 40 TCR # 86 BC 13 A 43 34 156 224 114 TCR # 21 BC 14 A 54 65 573 65 189 TCR # 35 BC 15 A 56 72 202 147 119 TCR # 13 BC 16 H 53 64 94 123 83 TCR # 49 BC 17 H 50 34 113 63 65 TCR # 65 BC 18 H 35 43 64 45 47 TCR # 16 MIX 19 T 34 76 97 89 74 TCR # 51 BC 20 T 69 43 37 43 48 TCR # 72 MIX 21 T 54 65 573 65 189 TCR # 71 MIX 22 H 66 53 153 53 81 TCR # 20 MIX 23 T 70 212 356 332 242 TCR # 58 MIX 24 T 233 214 456 546 362 Stg. 1 # 1 BC Avg 56 42 345 276 180 Stg. 1 # 2 BC Avg 82 136 146 246 152 Stg. 1 # 3 MIX Avg 280 163 446 263 288 Stg. 1 # 4 BC Max 140 215 557 615 382 Stg. 1 # 5 NC Avg 50 42 223 522 209 Stg. 1 # 6 NC Avg 53 42 84 72 63 Stg. 1 # 7 MIX Avg 140 66 364 236 201 Stg. 1 # 8 NC Max 196 45 653 425 330 MIX  Mixing Zone TCR  Total Coliform Rule E  Near Entry Point NC  New City Source Stg. 1  Stage 1 DBPR A  Average Residence Time BC  Big City Source T  Representative High TTHM H  Representative High HAA5 Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 7 4. Summary of selected SMP sample sites:

Present the rationale for the selection of the IDSE sampling sites, as well as a schematic showing their location within the distribution system.

Sampling sites were chosen to represent diverse geographical areas of the distribution system. Each site is shown on the map of the distribution system in section I. 6. Residual total chlorine ( Table J. 1) and HPC data ( Table J. 2) were considered in the selection of SMP monitoring sites.

SMP Site # 1   Entry point to the distribution system for New City supply. This site is located where the first group of customers receives water.

SMP Site # 2   Represents average residence time of water leaving New City. Based on total chlorine monitoring results at TCR sample sites, we identified the areas within the system where total chlorine levels dropped by approximately 50 percent of the total drop in residual seen in the area supplied by New City. The average initial concentration ( at SMP # 1) was 3.5 mg/ L. The average residual at SMP # 11 ( the site with the lowest residual and solely under the influence of New City) is 0.7 mg/ L. Therefore, the average drop in residual across the system is approximately 2.8 mg/ L; half of that drop is 1.4 mg/ L. Sites with residual concentrations near 2.1 mg/ L were considered to be approximate average residence time sites. The average residual at this site is 2.5 mg/ L. There are no storage facilities between the entry point and this site.

SMP Site # 3   Represents average residence time of water received from New City. Water at this site has an average total chlorine residual of 2.3 mg/ L. Based on the rationale presented in the discussion of site # 2, this site was determined to be an approximate average residence time site.

SMP Site # 4   Represents average residence time of water entering from New City. Water at this site has an average total chlorine residual of 2.5 mg/ L. Based on the rationale presented in the discussion of site # 2, this site was determined to be an approximate average residence time site.

SMP Site # 5   Represents high HAA5 levels. Sample site is in an area approaching the perimeter of the distribution system. Water in this area is primarily from the New City. Total chlorine residual at this site ranges between 1.7 and 2.1 mg/ L, and the heterotrophic plate count is consistently below 100 cfu per mL year round.

SMP Site # 6   Represents high HAA5 levels. This site is at the edge of the mixing zone between the New City and Big City influence areas. Total chlorine residual levels ranged between 1.0 and 1.2 mg/ L at this site, and the heterotrophic plate count never exceeded 100 cfu per mL.

SMP Site # 7   Represents high HAA5 levels. This site is a hose bib located at a convenience store. Total chlorine residual levels ranged between 1.6 and 1.8 mg/ L at this site, and the heterotrophic plate count never exceeded 100 cfu per mL. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 8 SMP Site # 8   Represents high TTHM levels. This sampling site is the western edge of the city. Total chlorine residuals at this site are generally very low.

SMP Site # 9   Represents high TTHM levels. This sampling site is believed to receive water from the Pineville Storage tank ( a 4 MG ground tank) during high demand periods and is at the entrance to a small subdivision cul de sac in the Oakville community. Chlorine residuals at this site are generally low. The sample site is near the first house on the cul de sac ( which has 12 homes total).

SMP Site # 10   Represents high TTHM levels. This site is located upstream of the Stage 1 DBPR monitoring site # 7. Both are used for routine Total Coliform Rule and chlorine residual monitoring. We have over 7 years of data from this site. This site is located near the predicted edge of the mixing zone where chlorine residual measurements indicate there may be a hydraulic dead end. Water at this site is generally from the New City supply, although specific conductivity data show that some mixed zone water may also influence this site.

SMP Site # 11   Represents high TTHM levels. This site has been problematic in the past due to positive total coliform test results, very low total chlorine residuals, high heterotrophic plate count results, and odor complaints. A 4 inch blow off was installed downstream of this site, but it continues to have periodic poor water quality. Water in this area is from the New City supply.

SMP Site # 12   Entry point to the distribution system for the Big City supply. This site is located near the first group of customers that receive water from the Big City supply.

SMP Site # 13   Represents average residence time of water entering from Big City. Based on total chlorine monitoring results at TCR sample sites, we identified the areas within the system where total chlorine levels dropped by approximately 50 percent of the total drop in residual seen in the area supplied by Big City. The average initial concentration ( at SMP # 1) was 3.3 mg/ L. The average residual at site # 24 ( the site with the lowest residual and solely under the influence of New City) is 0.6 mg/ L. Therefore, the average drop in residual across the system is approximately 2.7 mg/ L; half of that drop is 1.3 to 1.4 mg/ L. Sites with residual concentrations near 2.0 mg/ L were considered to be approximate average residence time sites. The average total chlorine residual at this site is 2.2 SMP Site # 14   Represents average residence time of water entering from Big City. Water at this site has an average total chlorine residual of 1.9 mg/ L. Based on the rationale presented in the discussion of site # 13, this site was determined to be an approximate average residence time site.

SMP Site # 15   Represents average residence time for the Big City water supply. This sampling site is in the southern edge of Cedarville subdivision. Water at this site has an average total chlorine residual of 2.2 mg/ L. Based on the rationale presented in the discussion of site # 13, this site was determined to be an approximate average residence time site. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 9 SMP Site # 16   Represents high HAA5 levels. Our Stage 1 DBPR results indicate the high HAA5 concentrations move around our system depending on the season and proportion of water supplies from New City and Big City, especially in the areas served by the Big City.

SMP Site # 17   Represents high HAA5 levels for the Big City supply. At this site, the water age is greater than average ( evidenced by average total chlorine residual of 1.5), the total chlorine residual was never below 1.8 mg/ L and the heterotrophic count plate is usually low ( below 100 with one exception in August).

SMP Site # 18   Represents high HAA5 levels for the Big City supply. At this site, the water age is approximately equal to the system average ( evidenced by average total chlorine residual of 2.1), the total chlorine residual was never below 1.9 mg/ L and the heterotrophic count plate is usually low ( below 100).

SMP Site # 19   Represents high TTHM levels. This sample site is located in a zone of the distribution system that has been recently developed. This connection is located downstream from a chlorine booster station. Total chlorine residuals are normally in the 2.5 to 2.9 mg/ L range. Water in this area is generally a mix of water from the New City and Big City supplies.

SMP Site # 20   Represents high TTHM levels. This site is downstream from the Jackson Storage Tank in Cypressville, a 1.5 million gallon elevated storage tank. There are often low chlorine residuals in the areas downstream of this tank.

SMP Site # 21   Represents high TTHM levels. This sampling site is in the mixed zone before the last group of connections near the end of the distribution system. This area receives water from the Cherry Hill Storage Tank and water that bypasses the tank. Water from this area can vary greatly in the percentages of New City and Big City water.

SMP Site # 22   Represents high HAA5 levels. At this site, the water age is believed to be greater than average because it is within the mixing zone, but the total chlorine residual is never below 1.6 mg/ L and the heterotrophic count plate is usually low ( below 100 cfu/ mL with one exception in August).

SMP Site # 23   Represents high TTHM levels. This sampling site is in the mixed zone. Total chlorine residuals range from 0.7 to 1.1 mg/ L which is well below the system average. This area receives water from the Pineville ground storage tank.

SMP Site # 24   Represents high TTHM levels. This sampling site is in the mixed zone. It has total chlorine residuals that range from 0.5 to 0.8 mg/ L which is well below the system average. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 10 5. SMP Sample Schedule:

Because the quarterly Stage 1 DBPR monitoring is the only DBP monitoring that has been performed in the Grove City system, historic DBP data is available for only the months of January, April, July, and October. July has regularly had the highest DBP levels, but no DBP data is available for the other summer months. As a result, we also reviewed finished water temperature in two years of TCR sampling records and determined our peak month for distribution system water temperature is August. But, we also found that July's average distribution system water temperature for the two years reviewed was only 0.5 º C less. Based on the historic DBP data and minimal difference in average water temperature, we concluded July is the controlling month for the Elm City distribution system. The following table summarizes our planned SMP sample dates and is based on collection of our samples on the second Monday of the month.

Proposed SMP Sample Schedule Planned Sample Date November 8, 2005 January 10, 2006 March 14, 2006 May 9, 2006 July 11, 2006 September 12, 2006 Dual sample sets will be collected from each of the 24 SMP sample sites on or close to the listed dates and analyzed for TTHM and HAA5 by a State certified laboratory. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 11 Poplarville MIXING ZONE Elevated Storage Tank Ground storage tank Pump station Chlorine Booster Station 8 7 6 5 4 3 2 1 11 10 4 6 3 2 1 12 21 20 19 16 22 14 13 Stage 1 DBPR site TCR / Selected SMP site Appleville Weeping Willow Oakville Pineville Cedarville Cypressville Downtown Industrial Park PS2 CB2 PS3 CB1 PS1 New City Purchased Water Entry Point Big City Purchased Water Entry Point Grove City Water Distribution System 18 17 15 23 24 5 9 8 7 6. Map of the distribution system showing major transmission mains, numbered Stage 1 DBPR compliance sites, and numbered SMP sample sites: Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 12 II. SMP RESULTS 1. Introduction:

The SMP was conducted between November 2005 and September 2006. The following table summarizes our planned SMP sample dates, the actual dates when samples were collected, and the reasons for deviations from the plan.

Actual SMP Sample Schedule Planned Sample Date Actual Sample Date Explanation November 8, 2005 November 8, 2005 On schedule January 10, 2006 January 10, 2006 On schedule March 14, 2006 March 14, 2006 On schedule May 9, 2006 May 9, 2006 On schedule July 11, 2006 July 11, 2006 On schedule September 12, 2006 September 14, 2006 Flooding closed many of the roads in Grove City, making many sample sites inaccesible until September 14.

2. Summary of IDSE SMP data and Stage 1 DBPR compliance data:

All DBP results from the SMP and concurrent Stage 1 DBPR compliance monitoring are presented in this section. The first table presents the DBP results for the SMP sample sites, organized by plant, then in order of highest to lowest TTHM LRAA. The second table presents the DBP results for the Stage 1 DBPR compliance sample sites for the period from November 2005 to August 2006. Sites proposed as Stage 2B compliance monitoring locations are shaded within the tables. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 13 Grove City   IDSE SMP Monitoring Results SMP Site # Site Type TTHM ( ug/ L) HAA5 ( ug/ L)

Data1 LRAA Data1 LRAA 1 entry point 36, 42, 30, 25, 38, 28 33 50, 44, 43, 47, 48, 38 45 12 entry point 30, 32, 39, 40, 32, 28 29 31, 29, 38, 48, 51, 45 43 13 average residence time 42, 34, 52, 57, 62, 51 50 23, 56, 40, 52, 40, 28 40 2 average residence time 54, 39, 42, 56, 60, 42 49 22, 29, 36, 40, 41, 30 33 4 average residence time 51, 42, 50, 39, 50, 42 47 19, 26, 28, 31, 26, 22 25 14 average residence time 47, 40, 52, 43, 51, 41 46 14, 20, 21, 23, 29, 19 21 15 average residence time 40, 45, 45, 48, 52, 46 46 41, 32, 45, 40, 35, 43 39 3 average residence time 42, 39, 53, 43, 49, 40 44 20, 25, 25, 29, 27, 19 24 6 high HAA5 36, 41, 43, 39 49, 45 42 60, 58, 68, 57, 68, 55 61 16 high HAA5 52, 35, 46, 42, 50, 38 44 56, 44, 65, 50, 50, 58 54 17 high HAA5 50, 33, 44, 40, 48, 36 42 53, 42, 64, 48, 49, 55 52 7 high HAA5 35, 30, 42, 44, 44, 25 37 37, 43, 55, 57, 50, 42 47 5 high HAA5 33, 29, 41, 42, 44, 22 35 36, 43, 52, 51, 48, 38 45 18 high HAA5 35, 31, 47, 38, 49, 30 39 37, 42, 48, 50, 41, 35 42 22 high HAA5 35, 29, 47, 37, 47, 27 37 36, 40, 46, 48, 40, 34 41 11 high TTHM 68, 59, 78, 76, 75, 65 70 42, 39, 47, 46, 40, 49 44 8 high TTHM 62, 60, 65, 71, 74, 72 67 42, 40, 33, 38, 46, 30 38 10 high TTHM 68, 62, 54, 65, 72, 70 65 39, 45, 28, 33, 40, 32 36 23 high TTHM 67, 59, 58, 49, 71, 75 63 32, 35, 27, 30, 39, 29 32 21 high TTHM 69, 56, 72, 59, 71, 55 63 19, 25, 39, 29, 21, 38 29 20 high TTHM 65, 61, 54, 50, 69, 71 62 37, 41, 29, 30, 41, 29 35 9 high TTHM 51, 56, 69, 58, 67, 52 59 31, 38, 37,40, 32, 45 37 24 high TTHM 50, 51, 55, 53, 62, 65 56 37, 39, 29, 28, 39, 27 33 19 high TTHM 56, 50, 55, 51, 61, 45 53 42, 30, 43, 38, 34, 42 38 1Data obtained from sampling every 60 days are listed in order for November, January, March, May, July, and September ( as required for a surface water supply $ 10,000). Note: Bold text and shading identifies proposed Stage 2 DBPR compliance sites. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 14 Grove City   Stage 1 DBPR Compliance Monitoring Results Stage 1 Site # Site Type TTHM ( ug/ L) HAA5 ( ug/ L)

Data1 LRAA Data1 LRAA Stg. 1 # 4 Maximum 64, 68, 83, 74 72 21, 25, 26, 28 25 Stg. 1 # 8 Maximum 61, 48, 56, 71 59 19, 22, 37, 30 27 Stg. 1 # 2 Average 38, 42, 52, 62 49 50, 62, 64, 65 59 Stg. 1 # 1 Average 45, 34, 56, 62 49 24, 32, 43, 45 36 Stg. 1 # 6 Average 47, 49, 39, 52 47 22, 30, 39, 41 33 Stg. 1 # 3 Average 36, 42, 45, 45 42 47, 50, 55, 56 52 Stg. 1 # 5 Average 44, 20, 62, 42 42 34, 45, 33, 41 38 Stg. 1 # 7 Average 41, 22, 50, 59 43 32, 46, 59, 52 47 1Data listed in order for October, January, April, and July quarterly sampling. Note: Bold text and shading identifies proposed Stage 2B compliance sites. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 15 III. PROPOSED STAGE 2B COMPLIANCE MONITORING SITES 1. Site Summary:

A total of 12 Stage 2B compliance monitoring sites were selected from the Stage 1 DBPR and SMP sites, as shown in the previous tables and as summarized in the following table.

Stage 2B Proposed Compliance Monitoring Sites Stage 2B Compliance Sites Previous Sample Site ID Site # Type 1 Average Stg. 1 # 2 2 Average Stg. 1 # 3 3 Average Stg. 1 # 1 4 High HAA5 SMP # 6 5 High HAA5 SMP # 16 6 High HAA5 SMP # 17 7 High TTHM Stg. 1 # 4 8 High TTHM SMP # 11 9 High TTHM SMP # 8 10 High TTHM SMP # 10 11 High TTHM SMP # 23 12 High TTHM SMP # 20 Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 16 2. Justification of Site Selections:

The reasons for the selection of the 12 sites for Stage 2B monitoring are:

1. Average Residence Time Sites   The Stage 2 DBPR required us to select three average residence time sites from among our existing Stage 1 DBPR monitoring sites. The sites were required to be selected based on alternating highest TTHM LRAA and HAA5 LRAA. Because we have three average residence time sites, we ultimately ended up selecting two based on highest TTHM LRAA and one based on highest HAA5 LRAA. Stage 1 DBPR average residence time sites # 2 and # 1 had the highest TTHM LRAA among Stage 1 DBPR average residence time sites. Stage 1 DBPR site # 3 had the highest HAA5 LRAA among the Stage 1 average residence time sites.

2. Representative High HAA5 Site   The three highest HAA5 LRAA values occur at SMP site # 6 and # 16, and # 17. Therefore, these three sites were designated as Stage 2B sites ( numbers 4, 5, and 6).

3. Representative High TTHM Sites   The six highest TTHM LRAA values occur at SMP Site # 11, # 8, # 10, # 23, and # 20, and Stage 1 DBPR Site # 4. Therefore, these six sites were designated as Stage 2B sites. SMP site # 20 and # 21 actually had the same TTHM LRAA, but site # 20 provided better geographic coverage and was selected as a proposed Stage 2B monitoring site.

3. Proposed Stage 2B Compliance Monitoring Schedule:

Stage 2B compliance monitoring will be scheduled for January, April, July, and October, the same as Stage 1 DBPR and Stage 2A DBPR sampling, for consistency and because the difference in distribution system water temperature between July and August is minimal ( average 0.5 º C higher in August, based on a review of 2 years of TCR sampling records). Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 17 Poplarville MIXING ZONE Elevated Storage Tank Ground storage tank Pump station Chlorine Booster Station Appleville Weeping Willow Oakville Pineville Cedarville Cypressville Downtown Industrial Park PS2 CB2 PS3 CB1 PS1 Grove City Stage 2B DBPR Compliance Sample Sites Stage 2B Representative High TTHM Stage 2B Representative High HAA5 Stage 2B Average Residence Time #

# #

New City Purchased Water Entry Point Big City Purchased Water Entry Point 1 4 2 3 6 5 7 10 11 12 8 9 4. Map of Proposed Stage 2B Compliance Monitoring Sites: Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft J 18 This page intentionally left blank. Appendix K IDSE System Specific Study Using a Hydraulic Model This appendix is provided as an example IDSE report for producing surface water systems serving least 10,000 people and opting to complete a System Specific Study ( SSS) using a water distribution system model.

Chapter 3 presents detailed guidance on the requirements for performing an SSS with a water distribution system model. Chapter 5 presents the detailed SMP requirements for these systems. Chapter 3 also provides guidance on selecting SMP sites and Stage 2B compliance monitoring sites based on SSS data, as well as IDSE reporting requirements. The application of the basic guidance on SMP site selection and Stage 2B compliance monitoring site selection is shown in this example, along with several instances of the use of best professional judgement being applied.

The italicized text within the appendix consists of comments and explanations and is not intended to represent the recommended content of an actual IDSE Report. This page intentionally left blank. Initial Distribution System Evaluation Report for Big City PWSID Number: US1111111 Address: 1234 Main Street Big City, US 99999 Contact Person: Mr. John Smith, P. E.

Phone Number: 123 555 0000 Fax Number: 123 555 0001 Email Address: jsmith@ ci. bigcity. us System Type: Community, surface water Population Served: 55,000 This page intentionally left blank. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft K 1 1. System Description:

This section of the report includes a summary of typical system operating characteristics ( and how they change on a seasonal basis if appropriate) explaining how sources are used to meet system demands, where high water age is expected to occur, and any special aspects of operation that could affect DBP concentrations in the distribution system. Information about water treatment processes and source water quality data should also be part of this section, including a description of water treatment, actual residence times within the water treatment plant and the distribution system.

General system characteristics: Service area: Big City plus surrounding suburban areas Production: Annual average daily demand 7 MGD Source Water Information: Adams Reservoir ( surface water) water quality: pH: from 7.0 to 8.0 Alkalinity: from 62 to 88 mg/ L as CaCO3 TOC: from 3.2 to 6.8 mg/ L as C Lincoln River ( surface water) water quality: pH: from 6.8 to 7.9 Alkalinity: from 77 to 94 mg/ L as CaCO3 TOC: from 1.6 to 4.4 mg/ L as C Entry points and service areas under the influence of each entry point: ( Entry points should be tied to source( s) and typical flows noted)

Entry points: Adams Plant   serves the northern half of the city Lincoln Plant   serves the southern half of the city Treatment Provided: Adams Plant is a 6 MGD plant located on the northern edge of the city. It draws water from Adams Reservoir. The plant utilizes coagulation ( with ferric chloride), flocculation, sedimentation, and dual media filters ( filter loading rates are approximately 4 gpm/ sf).

Lincoln Plant is an 8 MGD plant located in the southern part of the system and draws water from Lincoln River. The treatment process is identical to that of the Adams Plant, except that the Lincoln Plant also includes GAC filters following dual media filtration to enhance TOC removal. The Lincoln River is prone to rapid changes in TOC, and the GAC was installed as an extra barrier to prevent significant DBP formation in the distribution system.

Primary and residual disinfection: Chlorine/ chloramines at both plants. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft K 2 Description of distribution system:

Distribution system ( estimated length of lines and range of diameter): About 300 miles, 4"  36" Lined and unlined cast iron pipe, ductile iron pipe, and plastic pipe 4 storage tanks of 9 MG total capacity 1 ground tank 4 MG capacity 2 elevated tanks each with 2 MG capacity 1 elevated tank with 1 MG capacity The average residence time of water in the distribution system is approximately two days.

Pump stations: A pump station is located at the north tank ( 4 MG ground storage tank). This pump is primarily used during peak demands and low pressure situations. The pump is timed to turn on in the morning and evening during peak demand, and when the pressure drops below 40 psi at a point downstream of the pump station.

Booster chloramination facilities: Booster Facility A is located in the northwestern part of the city. This facility is occasionally used during the summer when total chlorine residuals at remote locations downstream of the booster facility cannot be maintained.

Booster Facility B is located in the southeastern part of the city, where total chloramine residuals have historically been low.

A schematic of the distribution system is presented in the following section. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft K 3 Booster chloramination facility Ground storage tank Elevated storage tank MIXING ZONE Adams WTP Lincoln WTP North Tank ( w/ pump station)

South Tank West Tank Central Tank Booster Station B Booster Station A 2. Schematic of the distribution system: Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft K 4 3. Summary of SSS requirements:

Big City has extensive experience with water distribution system modeling. To select Stage 2B compliance monitoring sites, the city has performed a System Specific Study ( SSS) based on its water distribution system model, data from one round of new DBP sampling, and data from Stage 1 DBPR compliance monitoring.

To confirm model results, we conducted one round of DBP sampling at sites equivalent to those that would be selected under the SMP requirements for large, subpart H systems. A summary of these requirements is presented in the following table. The methodology by which these sites were chosen is presented in section 5.

Additional DBP Sampling Site Criteria1 Site Criteria Number of Sample Sites Adams WTP Influence Zone Lincoln WTP Influence Zone Near entry to the distribution system 2 2 Average residence time 2 2 Representative of high TTHM 2 2 Representative of high HAA5 2 2 1 These sites were allocated based on SMP requirements for a system of our size and source water type and practicing similar disinfection methods.

4. Description of Hydraulic Model The hydraulic model for Big City includes all 8 inch and larger pipes and also includes 6 inch pipes for the remote areas of the distribution system. Approximately 60 percent of the total pipe length in the distribution system is included in the model. The open/ closed status of all four storage tanks and the on/ off status of the pump station at the North Tank have been modeled. There are two control valves in the distribution system, but these do not significantly affect the water flow through the distribution system. Therefore, these control valves have not been modeled.

Water demand has been assigned to approximately 60 percent of the nodes in the model. In areas where there are no water users at the dead end of a pipe segment, a very small nominal demand was assigned to the end nodes so that water ages at the dead ends could be calculated by the modeling software. Summer and winter average demand data were available for residential customers and large commercial and industrial customers. The estimated water loss in the system is about 10 percent and this was accounted for in the model. Based on the master meter flows, tank levels, and customer meter readings, a diurnal ( 24 hour) demand pattern was derived and was applied to the residential, Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft K 5 commercial, and industrial customers. The inclusion of diurnal demand patterns allows the hydraulic model to be run in the extended period simulation ( EPS) mode.

A major calibration effort was performed when the model was developed in 1998. At that time the model was calibrated for average summer and maximum day conditions. Since the last calibration, no significant changes have been made to the distribution system that could change the system hydraulics. The calibration program included extensive C factor tests conducted over the previous 10 years and comparisons of modeled and measured pressures throughout the system. The model predicted pressures were within ± 3 psi of the field measured pressures at 70 percent of the readings. This is consistent with calibration guidelines for hydraulic models to be used for water quality purposes ( Walski, et al., " Perspectives in Calibration," Current Methods, 1: 1: 21, Haested Press, 2001).

5. Summary of the SSS methodology:

Summarize the methodology used to conduct the SSS, including the rationale for the selection of sites equivalent to the sample sites required for the Standard Monitoring Program ( SMP).

The hydraulic model was applied in a variety of ways to understand the flow of water through the distribution system and guide the selection of monitoring sites that reflected the selection criteria outlined in Chapter 3 of the IDSE guidance manual. For this SSS, 16 sites were selected that meet the criteria required for the SMP of a system of a similar size and source water type providing similar disinfection ( see section 3).

The model was run in the extended period simulation ( EPS) mode under average summer conditions for 14 days, and showed a consistent, repeating pattern of water age at all nodes after approximately 10 days. This indicates the maximum residence time in the distribution system under average summer conditions is approximately 10 days. The water age option was used in the model to obtain residence time throughout the distribution system. In addition to residence time calculations, the model was used to define influence zones of the two source waters. The source tracing option was used in the model to determine the average contribution of the two water sources to each node in the model.

Three zones were defined based on the two water sources:

° The area served primarily by the Adams WTP ° The area served primarily by the Lincoln WTP ° The area that generally received water from both treatment plants over the course of the day, either as a mixture or on an alternating basis Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft K 6 Because the Stage 1 DBPR compliance data indicates that DBP levels are highest in the Big City distribution system during the summer months, average day demands for the summer were used to determine residence times and mixing zones. Average day demands during winter conditions were also examined and the mixing zone was found to be very similar to the summer conditions.

The residence time data obtained from the model for the summer conditions were compared with the total chlorine residual data at the TCR monitoring sites for May and August ( Table K. 1). In general, there is a direct correlation between model predicted residence times and total chlorine residuals. Sites on the periphery of the distribution system have longer residence times and lower total chlorine residuals, except for areas where booster chloramination is used. Sites which are under the influence of the booster facilities maintain relatively high total chlorine residuals. However, these sites also have high residence times. Table K. 1 also summarizes model predicted residence times at each of the TCR monitoring sites.

The residence times from the model were used to select 16 of the 20 TCR monitoring sites for DBP monitoring. These sites are described in further detail in the following section. After the selection of 16 sites, one round of DBP dual samples was taken at these sites during August, which is the month of historically high DBP levels. The residence time data, Stage 1 DBPR compliance data ( Table K. 2), and DBP data from this new round of sampling were then used to select Stage 2B compliance monitoring sites.

Available Data:

Report all data that helped in site selection. If you have bromide, TOC, and or HPC data, these may be helpful for justifying Stage 2B site selection.

Total chlorine residual data for the months of February, May, August, and November, and residence time data for summer demand conditions obtained from the water distribution system model, at TCR monitoring sites is presented in Table K. 1. Quarterly Stage 1 DBPR compliance monitoring data is presented in Table K. 2. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft K 7 Table K. 1 Big City Distribution System   Total Chlorine Residual at TCR Monitoring Sites Monitoring Site Free Chlorine Residual ( mg/ L) Residence Time During Summer Demand Conditions ( days)

Nov. 2004 Feb. 2005 May 2005 Aug. 2005 Residence Time TCR # 1 3.2 3.4 3.5 3.6 0.1 TCR # 2 3.0 3.2 3.3 3.4 0.2 TCR # 3 2.4 2.3 1.9 1.8 4.1 TCR # 4 2.3 2.5 1.8 2.0 3.9 TCR # 5 3.0 2.9 2.6 2.5 2.1 TCR # 6 2.9 3.0 2.7 2.4 1.8 TCR # 7* 2.9 3.1 1.8 2.0 5.5 TCR # 8 1.8 1.4 1.1 1.0 6.6 TCR # 9 3.3 3.4 3.4 3.5 0.1 TCR # 10 3.4 3.3 3.5 3.4 0.1 TCR # 11 2.5 2.6 2.0 1.8 1.9 TCR # 12 2.7 2.4 1.9 1.7 2.2 TCR # 13 2.5 2.2 1.7 1.9 3.2 TCR # 14 2.4 2.2 2.0 1.8 4.1 TCR # 15 1.4 1.5 1.2 1.3 6.7 TCR # 16 1.6 1.6 1.3 1.1 7.0 TCR # 17 1.9 2.2 2.0 1.8 3.4 TCR # 18 2.6 2.4 2.6 2.5 1.3 TCR # 19 3.0 3.1 1.9 2.2 5.3 TCR # 20 2.0 1.9 1.5 1.6 4.4 Note: Site 7 is located downstream of Booster Station A. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft K 8 Table K. 2 Big City Distribution System   Stage 1 DBPR Monitoring Results Monitoring Site TTHM ( µ g/ L) HAA5 ( µ g/ L)

Last 4 Quarters Data1 Aug. 2005 LRAA Last 4 Quarters Data1 Aug. 2005 LRAA Adams Plant average residence time Site Number 1 45, 34, 56, 62 49 24, 32, 43, 45 36 Adams Plant average residence time Site Number 2 32, 34, 48, 67 45 42, 47, 55, 56 50 Adams Plant average residence time Site Number 3 36, 42, 45, 45 42 50, 62, 67, 68 62 Adams Plant maximum residence time Site Number 4 64, 68, 83, 74 72 21, 25, 26, 28 25 Lincoln Plant average residence time Site Number 5 44, 20, 62, 42 42 34, 45, 33, 41 38 Lincoln Plant average residence time Site Number 6 46, 49, 39, 50 46 22, 30, 39, 41 33 Lincoln Plant average residence time Site Number 7 41, 22, 50, 59 43 4, 46, 64, 58 54 Lincoln Plant maximum residence time Site Number 8 73, 50, 67, 58 62 19, 22, 37, 30 27 1 Data listed in order for November 2004 and February, May, and August 2005 quarterly sampling. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft K 9 6. Description of SSS monitoring sites:

Present the rationale for selection of the SSS monitoring sites, as well as a schematic showing their location within the distribution system.

SSS monitoring sites were selected based on modeling results and available total chlorine residual data. The sites represent diverse geographical areas of the distribution system and are shown on the map of the distribution system in section 7.

Sites # 1 and # 2 represent the entry point to the distribution system from Adams Plant. The residence time at these sites is about 2 to 4 hours.

Sites # 3 and # 4 are representative of predicted high HAA5 concentrations in the zone served by the Adams WTP. These sites are located on 6 inch dead end lines near the extremities of the system. As a result, travel time ( and thus water age) to these sites is long, approximately 4 days, based on the water age modeling. However, the modeling indicates that these sites are always fed directly from the treatment plant ( the water does not go through a storage tank) and routine sampling has shown that there are adequate chlorine residuals at these sites. As a result, biodegradation is not expected to occur, and high HAA5 concentrations are expected.

Sites # 5 and # 6 were selected to represent average conditions in the zone fed by Adams WTP. Monitoring results indicated an average total chlorine residual at these sites of 2.8 mg/ L during the summer. Modeling shows that typical water age at these sites is approximately 2 days.

Site # 7 was selected to represent high TTHM levels in the Adams WTP zone. This site is downstream of the Chlorine Booster Station A; thus, the chlorine residuals are relatively high. The model indicated that the water age is high ( around 5 days).

Site # 8 is representative of high TTHM levels in the mixing zone and is counted as one of the eight sites required for the Adams WTP. Modeling shows that water age at this site is generally high (> 6 days) throughout the day, representing water that has traveled a significant distance and that has usually been through one of the storage tanks.

Sites # 9 and # 10 represent the entry point to the distribution system from the Lincoln Plant. The residence time of these sites is about 2 hours.

Sites # 11 and # 12 were selected to represent average conditions in the area served by Lincoln WTP. Water age modeling indicated the residence times for these sites are approximately 2 days.

Sites # 13 and # 14 represent expected high HAA5 concentrations in the zone served by the Lincoln WTP. These sites are located on 12 inch looped lines with low water demand near the extremities of the system. As a result, travel time ( and thus water age) to these sites is approximately 3 to 4 days, based on the water age modeling. However, the modeling indicates that the sites are always Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft K 10 fed directly from the Lincoln WTP and routine sampling has shown that the total chlorine residual at these sites is usually about 2.3 mg/ L during the summer. As a result, biodegradation is not expected to occur, and high HAA5 concentrations are expected.

Site # 15 is located on the eastern extremity of the system beyond the South Tank. Based on modeling, it was determined that, due to the travel time from the plant to this site and the effects of South Tank, the water age at this site typically exceeds 5 days. This site represents high TTHM.

Site # 16 is representative of high TTHM levels in the mixing zone and is counted as one of the eight sites required for the Lincoln WTP. Modeling shows that water age at this site is generally high (> 6 days) throughout the day, representing water that has traveled a significant distance and that has usually been through one of the storage tanks. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft K 11 Booster chloramination facility Ground storage tank Elevated storage tank MIXING ZONE Adams WTP Lincoln WTP North Tank ( w/ pump station)

South Tank West Tank Central Tank Booster Station B Booster Station A 1 3 4 5 11 6 7 8 10 12 15 16 13 14 20 19 18 17 1 2 3 4 5 6 7 8 TCR Site used for SSS TCR Site not used for SSS Stage 1 DBPR Compliance Site ##

##

# 2 9 7. Map of the distribution system showing major transmission mains, Stage 1 DBPR compliance sites, and SSS sites: Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft K 12 8. Summary of SSS monitoring results:

One round of DBP samples was collected in August 2005 at the SSS sites listed in section 6. August is historically the high DBP month for Big City. The results from this sampling are presented in the following tables, with separate sections for each plant and the sites in order according to TTHM results, from highest to lowest. For comparison, Stage 1 DBPR sampling results for the month of August 2005 and the LRAAs as of August 2005 ( shown in parentheses) are also presented in the table ranked by individual TTHM sample results.

Adams Plant TTHM and HAA5 Test Results Site # Type TTHM Result ( µ g/ L) HAA5 Result ( µ g/ L)

Adams Plant SSS Sites  August 2005 SSS # 7 High TTHM 83 48 SSS # 8 High TTHM 62 45 SSS # 3 High HAA5 50 50 SSS # 5 Average Residence Time 48 45 SSS # 4 High HAA5 48 32 SSS # 6 Average Residence Time 45 30 SSS # 2 Near Entry Point 34 28 SSS # 1 Near Entry Point 32 30 Site # Type TTHM Result ( LRAA) ( µ g/ L) HAA5 Result ( LRAA) ( µ g/ L)

Adams Plant Stage 1 DBPR Sites  August 2005 Stage 1 # 4 Max. Residence Time 74 ( 72) 28 ( 25)

Stage 1 # 2 Avg. Residence Time 67 ( 45) 56 ( 50)

Stage 1 # 1 Avg. Residence Time 62 ( 49) 45 ( 36)

Stage 1 # 3 Avg. Residence Time 45 ( 42) 68 ( 62) Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft K 13 Lincoln Plant TTHM and HAA5 Test Results Site # Type TTHM Result ( µ g/ L) HAA5 Result ( µ g/ L)

Lincoln Plant SSS Sites  August 2005 SSS # 16 High TTHM 76 48 SSS # 15 High TTHM 73 36 SSS # 13 High HAA5 66 35 SSS # 14 High HAA5 62 58 SSS # 11 Average Residence Time 52 40 SSS # 12 Average Residence Time 50 42 SSS # 9 Near Entry Point 40 34 SSS # 10 Near Entry Point 44 32 Lincoln Plant Stage 1 DBPR Sites  August 2005 Site # Type TTHM Result ( LRAA) ( µ g/ L) HAA5 Result ( LRAA) ( µ g/ L)

Stage 1 # 7 Avg. Residence Time 59 ( 43) 58 ( 54)

Stage 1 # 8 Max. Residence Time 58 ( 62) 30 ( 27)

Stage 1 # 6 Avg. Residence Time 50 ( 46) 41 ( 33)

Stage 1 # 5 Avg. Residence Time 42 ( 42) 41 ( 38)

9. Proposed Stage 2B monitoring sites:

Big City is a system serving 55,000 people that uses two surface water sources. Therefore, Big City is required to designate four ( 4) Stage 2B compliance monitoring sites for each plant resulting in a total of eight ( 8) Stage 2B compliance monitoring sites. A summary of these requirements is presented in the following table.

Stage 2B Compliance Monitoring Requirements Site Criteria Number of Sample Sites Adams WTP Influence Zone Lincoln WTP Influence Zone Stage 1 average residence time sites 1 1 Representative of high HAA5 1 1 Representative of high TTHM 2 2 Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft K 14 Based on the modeling results, Stage 1 DBPR data, and additional DBP sampling results at the SSS monitoring sites, we are proposing the Stage 2B compliance monitoring sites listed in the following table. The rationale for their selection follows.

Stage 2B Proposed Compliance Sample Sites Stage 2B Sites Site Description ( Previous Site ID) No. Plant Type 1 Adams Average Stage 1 DBPR average residence time ( Stage 1 # 3)

2 Adams Highest HAA5 Stage 1 DBPR average residence time ( Stage 1 # 2)

3 Adams Highest TTHM High TTHM from Adams Plant ( SSS # 7)

4 Adams Highest TTHM Stage 1 DBPR maximum residence time ( Stage 1 # 4)

5 Lincoln Average Stage 1 DBPR average residence time ( Stage 1 # 7)

6 Lincoln Highest HAA5 High HAA5 from Lincoln Plant ( SSS # 14)

7 Lincoln Highest TTHM High TTHM from Lincoln Plant ( SSS # 16)

8 Lincoln Highest TTHM High TTHM from mixing zone ( SSS # 15)

° Stage 2B Site # 1: This is the average residence time site for the Adams WTP influence area. It had the highest HAA5 test result in the August round of sampling of all the sites, both SSS and Stage 1 DBPR. It also had the highest HAA5 LRAA ( 62 µ g/ L) of the Stage 1 DBPR sites, and this LRAA exceeds the MCL. The other two Stage 1 DBPR average residence time sites had higher individual TTHM results and TTHM LRAAs, but their HAA5 results and LRAAs were significantly less. This site ( the old Stage 1 DBPR # 3) is also in the geographic center of the Adams Plant influence area.

° Stage 2B Site # 2: This is the representative high HAA5 site for the Adams WTP influence area. It had the second highest ( after Stage 2B # 1) HAA5 result of the 12 sites. It is located on the south central region of the distribution system.

° Stage 2B Site # 3: This is one of two representative high TTHM sites for the Adams WTP influence area. It had the highest TTHM result of the 12 Adams WTP sites. It is on the western periphery of the Adams WTP influence area and downstream of Booster Station A, which is used intermittently during the summer. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft K 15 ° Stage 2B Site # 4: This is the second of the representative high TTHM sites for the Adams WTP influence area. It had the second highest TTHM result of the 12 Adams sites, and because it was the Stage 1 DBPR maximum residence time location, its continued use will maintain an uninterrupted historic record of DBP levels at the site. It is in the mixing zone in the center of the city.

° Stage 2B Site # 5: This is the average residence time site for the Lincoln WTP influence area. It had the highest TTHM and HAA5 test results in the August round of sampling of the Stage 1 DBPR average sites. Its TTHM LRAA was not as high as one of the other two Stage 1 DBPR average sites ( old Stage 1 DBPR # 6), but its HAA5 LRAA was the highest HAA5 LRAA of the Stage 1 sites by a large margin. This site ( the old Stage 1 DBPR # 7) is also in the geographic center of the Lincoln Plant influence area.

° Stage 2B Site # 6: This is the representative highest HAA5 site for the Lincoln WTP influence area. It had the highest HAA5 result of the 8 Lincoln SSS sites. It is located on the eastern periphery of the Lincoln WTP influence area and has historically always had a measurable total chlorine residual, which is most likely due to the effect of the frequent operation of Booster Station B.

° Stage 2B Site # 7: This is the first of two representative highest TTHM sites for the Lincoln WTP influence area. It had the highest TTHM result of the 12 Lincoln WTP sites, and is located in the mixing zone in the central portion of the city.

° Stage 2B Site # 8: This is the second of the representative highest TTHM sites for the Lincoln WTP influence area. It had the second highest TTHM result of the 12 Lincoln sites. It is on the eastern edge of the city.

The map on the following page shows the proposed Stage 2B compliance monitoring sites.

10. Proposed Stage 2B Compliance Monitoring Schedule:

Stage 2B compliance monitoring will be scheduled for the first week of February, May, August, and November. This is the same as the Stage 1 DBPR and Stage 2A DBPR sampling, because August is the historic month of maximum DBP levels and water temperature in the distribution system. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft K 16 Booster chlorination facility Ground storage tank Elevated storage tank MIXING ZONE Adams WTP Lincoln WTP North Tank ( w/ pump station)

South Tank West Tank Central Tank Booster Station B Booster Station A 3 8 7 1 5 Stage 2B Representative High TTHM Stage 2B Representative High HAA5 Stage 2B Average Residence Time #

#

# 6 2 4 11. Proposed Stage 2B compliance monitoring sites: Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft K 17 This page intentionally left blank. Appendix L IDSE System Specific Study Using Historical Data This appendix is provided as an example IDSE report for a producing system opting to complete a System Specific Study ( SSS) using historical DBP data.

Chapter 3 presents detailed guidance on the requirements for performing an SSS with historical data and guidance on the selection of Stage 2B compliance monitoring sites using SSS data. Chapter 3 also presents the IDSE reporting requirements for systems conducting an SSS. The application of the basic guidance on the use of historical data to select sites meeting the SMP site criteria and the use of the data to select Stage 2B compliance monitoring sites is shown in this example, along with several instances of the use of best professional judgement being applied.

The italicized text within the appendix consists of comments and explanations and is not intended to represent the recommended content of an actual IDSE Report. This page intentionally left blank. Initial Distribution System Evaluation Report for Magnolia City PWSID Number: US0000000 Address: P. O. Box 1234 Magnolia City, US 11111 1234 Contact Person: Ms. Mary Flower, P. E.

Phone Number: 234 555 1111 Fax Number: 234 555 2222 Email Address: Mflower@ ci. magnolia. us System Type: Community, surface water Population Served: 125,000 This page intentionally left blank. Stage 2 DBPR Initial Distribution System Evaluation Guidance Manual July 2003  Proposal Draft L 1 1. System Description:

This section of the report should include a summary of typical system operating characteristics ( and how they change on a seasonal basis if appropriate) explaining how sources are used to meet system demands, where high water age is expected to occur, and any special aspects of operation that could affect DBP concentrations in the distribution system. Information about water treatment processes and source water quality data is also part of this section, including a description of actual residence times within the water treatment plant and the distribution system.