Protecting Texas by Reducing and Preventing Pollution Hazard Ranking System Documentation Record Patrick Bayou Site Deer Park, Harris County, Texas TX0000605329 REGION VI Prepared in cooperation with the U. S. Environmental Protection Agency February 2001 Hazard Ranking System Documentation Record Patrick Bayou Site Deer Park, Harris County, Texas TX0000605329 Prepared in cooperation with the U. S. Environmental Protection Agency Region VI Prepared by Protecting Texas by Reducing and Preventing Pollution Texas Natural Resource Conservation Commission Site Assessment and Management Section Superfund Site Discovery and Assessment Program Austin, Texas February 2001 The preparation of this report was financed through grants from the U. S. Environmental Protection Agency. i TABLE OF CONTENTS Page Reference Listing .............................................................. 10 HRS Documentation Record Review Cover Sheet ...................................... 1 Notes to the Reader ............................................................. 2 HRS Documentation Record ...................................................... 3 Worksheet for Computing HRS Site Score ............................................ 6 Surface Water Overland/ Flood Migration Component Scoresheet ........................... 7 2.2 SOURCE CHARACTERIZATION .......................................... 13 2.2.1 Source Identification ................................................ 13 2.2.2 Hazardous Substances Associated with a Source .......................... 17 2.2.3 Hazardous Substances Available to a Pathway ............................ 20 2.3 LIKELIHOOD OF RELEASE .............................................. 21 2.4 WASTE CHARACTERIZATION ........................................... 21 2.4.1 Selection of Substance Potentially Posing Greatest Hazard .................... 21 2.4.2 Hazardous Waste Quantity ........................................... 21 <IP_ADDRESS> Source Hazardous Waste Quantity .............................. 21 <IP_ADDRESS>.1 Hazardous Constituent Quantity (Tier A) ............ 21 <IP_ADDRESS>.2 Hazardous Waste Stream Quantity (Tier B) .......... 21 <IP_ADDRESS>.3 Volume (Tier C) .............................. 21 <IP_ADDRESS>.4 Area (Tier D) ................................ 21 <IP_ADDRESS>.5 Hazardous Waste Quantity Value ................. 22 Sources Not Evaluated .................................. 24 3.0 GROUND WATER MIGRATION PATHWAY ................................ 25 3.0.1 General Considerations .............................................. 25 4.0 SURFACE WATER MIGRATION PATHWAY ................................ 26 4.1 OVERLAND/ FLOOD MIGRATION COMPONENT ........................... 26 4.1.1 General Considerations .............................................. 26 <IP_ADDRESS> Definition of Hazardous Substance Migration Path for Overland/ Flood Migration Component ............................................... 28 Overland Segment, Probable Point of Entries (PPEs), Number of Watersheds ..... 28 <IP_ADDRESS> Target Distance Limit ........................................ 28 <IP_ADDRESS> Evaluation of Overland/ Flood Migration Component ................ 29 4.1.2 Drinking Water Threat .............................................. 30 <IP_ADDRESS> Drinking Water Threat  Likelihood of Release ..................... 30 <IP_ADDRESS>.1 Observed Release ........................................ 30 Chemical Analysis ...................................... 30 Background Concentrations .............................. 30 ii Contaminated Samples .................................. 35 Hazardous Substances Released ........................... 81 Attribution ........................................... 81 Attribution to Potential Sources ........................................ 82 4.1.3 Human Food Chain Threat ........................................... 83 <IP_ADDRESS> Human Food Chain Threat  Likelihood of Release ................. 83 <IP_ADDRESS> Human Food Chain Threat  Waste Characteristics ................. 83 <IP_ADDRESS>.1 Toxicity/ Persistence/ Bioaccumulation ............... 83 <IP_ADDRESS>.2 Hazardous Waste Quantity ...................... 85 <IP_ADDRESS>.3 Waste Characteristics Factor Category Value ........ 86 <IP_ADDRESS> Human Food Chain Threat  Targets ............................ 87 <IP_ADDRESS>.1 Food Chain Individual .......................... 87 <IP_ADDRESS>.2 Population .................................. 88 <IP_ADDRESS>.3 Calculation of HFC Threat  Targets Factor Category Value ............................................... 88 <IP_ADDRESS> Calculation of Human Food Chain Threat Score .................... 88 4.1.4 Environmental Threat ............................................... 89 <IP_ADDRESS> Environmental Threat  Likelihood of Release ...................... 89 <IP_ADDRESS> Environmental Threat  Waste Characteristics ...................... 89 <IP_ADDRESS>.1 Ecosystem Toxicity/ Persistence/ Bioaccumulation ...... 89 <IP_ADDRESS>.2 Hazardous Waste Quantity ...................... 91 <IP_ADDRESS>.3 Waste Characteristics Factor Category Value ........ 92 <IP_ADDRESS> Environmental Threat  Targets ................................ 93 <IP_ADDRESS>.1 Sensitive Environments ......................... 93 <IP_ADDRESS>.1.1 Level I Concentrations ............ 93 <IP_ADDRESS>.1.2 Level II Concentrations ........... 94 Wetlands Frontage ..................................... 95 <IP_ADDRESS>.1.3 Potential Contamination ........... 96 <IP_ADDRESS>.1.4 Calculation of Environmental Threat Targets Factor Category Value ................ 97 <IP_ADDRESS> Calculation of Environmental Threat Score for a Watershed ........... 97 4.1.5 Calculation of Overland/ Flood Migration Score for a Watershed ............... 98 4.1.6 Calculation of Overland/ Flood Migration Component Score .................. 98 4.2 GROUND WATER TO SURFACE WATER MIGRATION COMP0NENT .......... 99 4.3 CALCULATION OF SURFACE WATER MIGRATION PATHWAY SCORE ........ 99 5.0 SOIL EXPOSURE PATHWAY ............................................ 100 5.0.1 General Considerations ............................................. 100 6.0 AIR MIGRATION PATHWAY ............................................ 101 6.1.1 Observed Release ................................................ 101 Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 iii TABLE OF CONTENTS (continued)

TABLES Page 1 Source Description  Contaminated Sediment Samples ............................ 17 2 Source No. 1  Other (Contaminated Sediments) Hazardous Waste Quantity ............ 22 3 Site Summary of Source Descriptions .......................................... 23 4 Background Samples Collected .............................................. 31 5 Summary of Highest Inorganic and Organic Background Concentrations ................ 32 6 Contaminated Sediment Samples ............................................. 35 7 Data Usability for Sediment Samples .......................................... 76 8 Hazardous Substance Toxicity, Persistence and Bioaccumulation Potential .............. 83 9 Hazardous Waste Quantity  Food Chain ....................................... 85 10 Hazardous Substance Ecosystem Toxicity, Persistence and Bioaccumulation ............. 89 11 Hazardous Waste Quantity  Environmental ..................................... 91 12 Environmental Threat  Targets  Level II Concentrations ........................... 94 FIGURES Figure 1a Regional Location Map ............................................... 4 Figure 1b Site Location and Surrounding Land Use Map ............................. 5 Figure 2 Site Features Map ................................................. 14 Figure 3 Sediment Sample Locations .......................................... 15 Figure 4 Surface Water Pathway ............................................. 27 Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 iv HRS DOCUMENTATION RECORD REVIEW COVER SHEET SITE NAME: PATRICK BAYOU SITE CONTACT PERSON:

Brenda Cook, USEPA Region 6 NPL Coordinator 214/ 665 7436 Pathway, Components, or Threats Not Evaluated Ground Water Migration Pathway The Ground Water Pathway was not evaluated due to the lack of targets and because the inclusion of this pathway would not significantly affect the site score.

Surface Water Pathway The drinking water threat was not evaluated due to lack of targets and because the inclusion of this threat would not significantly effect the site score.

Soil Exposure Pathway The Resident Population Threat, and Nearby Population Threat, were not evaluated due to the lack of targets and because the inclusion of this pathway would not significantly affect the site score.

Air Migration Pathway The Air Migration Pathway was not evaluated due to the lack of targets and because the inclusion of this pathway would not significantly affect the site score. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 v NOTES TO THE READER The following rules were used when citing references in the HRS Documentation Record:

1. All references attached to this report have been stamped with a designated page number (example: Ref. 1, p. 10 = 001 00010). However, if the reference being cited has an original page number, that page number was cited. If the reference being cited has no original page number or the pagination is not complete, then the designated page number is cited.

2. The State predecessor agencies: Texas Water Quality Board (TWQB), Texas Department of Water Resources (TDWR), Texas Water Commission (TWC), and Texas Air Control Board (TACB), referred to throughout this report are now known as the Texas Natural Resource Conservation Commission (TNRCC). The new agency, TNRCC, became effective September 1, 1993, as mandated under State Senate Bill 2 of the 73rd Regular Legislative Session. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 vi HRS DOCUMENTATION RECORD Name of Site: Patrick Bayou Site Date Prepared: 11/ 00 CERCLIS Site ID Number: TX0000605329 Site Specific Identifier: Other (Contaminated Sediments).

Street Address of Site: None (see General Location below)

City, County, State: Deer Park, Harris County, Texas General Location in the State: The Patrick Bayou site is located approximately 1 mile north of Deer Park, Texas, originating south of SH 225 draining 2.85 miles north to the Houston Ship Channel along the southern Gulf Coast of Texas (see Figure 1a, Regional Location Map and Figure 1b, Site Location and Surrounding Land Use Map)

Topographic Map: US Geological Survey 7.5 Minute Topographic Map, La Porte Quadrangle.

Latitude: 29° 43' 55" North Longitude: 95° 06' 52.5" West (Approximate center of bayou, see Reference 6, Topographic Map)

EPA Region 6 Pathway Scores: Ground Water Migration Pathway  NE Surface Water Migration Pathway  95.67 Soil Exposure Pathway  NE Air Migration Pathway  NE NE = Not Evaluated HRS SITE SCORE: 47.83 Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 vii Figure 1a Regional Location Map Patrick Bayou Site A copy of the site location map is available at the EPA Headquarters Superfund Docket:

U. S. CERCLA Docket Office Crystal Gateway #1, 1st Floor 1235 Jefferson Davis Highway Arlington, VA 22202 Telephone: (703) 603 8917 E Mail: superfund. docket@ epa. gov Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 viii Figure 1b Site Location and Surrounding Land Use Map Patrick Bayou Site A copy of the site location map is available at the EPA Headquarters Superfund Docket:

U. S. CERCLA Docket Office Crystal Gateway #1, 1st Floor 1235 Jefferson Davis Highway Arlington, VA 22202 Telephone: (703) 603 8917 E Mail: superfund. docket@ epa. gov Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 ix WORKSHEET FOR COMPUTING HRS SITE SCORE S S 2 1. Ground Water Migration Pathway Score (Sgw) NE (from Table 3 1, line 13)

2a. Surface Water Overland/ Flood Migration 95.67 9,152.7 Component (from Table 4 1, line 30)

2b. Ground Water to Surface Water Migration NE Component (from Table 4 25, line 28)

2c. Surface Water Migration Pathway Score (Ssw) 95.67 9,152.7 Enter the larger of lines 2a and 2b as the pathway score.

3. Soil Exposure Pathway Score (Ss) NE (from Table 5 1, line 22)

4. Air Migration Pathway Score (Sa) NE (from Table 6 1, line 12)

5. Total of Sgw 2 + Ssw 2 + Ss 2 + Sa 2 9,152.7 6. HRS Site Score Divide the value on line 5 by 4 and take the square root. 47.83 NE = Not Evaluated Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 x SURFACE WATER OVERLAND/ FLOOD MIGRATION COMPONENT SCORESHEET Factor Categories and Factors Maximum Value Value Assigned DRINKING WATER THREAT Drinking Water Threat Score 1. Observed Release 550 NS 2. Potential to Release by Overland Flow:

2a. Containment 10 NS 2b. Runoff 25 NS 2c. Distance to Surface Water 25 NS 2d. Potential to Release by Overland Flow [Lines 2a x (2b + 2c)] 500 NS 3. Potential to Release by Flood:

3a. Containment (Flood) 10 NS 3b. Flood Frequency 50 NS 3c. Potential to Release by Flood (Lines 3a x 3b) 500 NS 4. Potential to Release (Lines 2d + 3c, subject to a maximum of 500) 500 NS 5. Likelihood to Release (Higher of Lines 1 and 4) 550 NS Waste Characteristics 6. Toxicity/ Persistence * NS 7. Hazardous Waste Quantity * NS 8. Waste Characteristics 100 NS Targets 9. Nearest Intake 50 NS 10. Population:

10a. Level I Concentrations ** NS 10b. Level II Concentrations ** NS 10c. Potential Contamination ** NS Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 xi SURFACE WATER OVERLAND/ FLOOD MIGRATION COMPONENT SCORESHEET 10d. Population (Lines 10a + 10b + 10c) ** NS 11. Resources 5 NS 12. Targets (Lines 9 + 10d + 11) ** NS NS = Not Scored Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 xii SURFACE WATER OVERLAND/ FLOOD MIGRATION COMPONENT SCORESHEET DRINKING WATER THREAT (Concluded)

Factor Categories and Factors Maximum Value Value Assigned Drinking Water Threat Score 13. Drinking Water Threat Score [( Lines 5 x 8 x 12)/ 82,500, subject to a maximum of 100] 100 NS HUMAN FOOD CHAIN THREAT Likelihood of Release 14. Likelihood of Release (Same value as Line 5) 550 550 Waste Characteristics 15. Toxicity/ Persistence/ Bioaccumulation * 5x10 8 16. Hazardous Waste Quantity * 100 17. Waste Characteristics 1,000 320 Targets 18. Food Chain Individual 50 20 19. Population:

19a. Level I Concentrations ** 0 19b. Level II Concentrations ** 0 19c. Potential Human Food Chain Contamination ** NS 19d. Population (Lines 19a + 19b + 19c) ** 0 20. Targets (Value from Lines 18 + 19d) ** 20 Human Food Chain Threat Score 21. Human Food Chain Threat Score [( Lines 14 x 17 x 20)/ 82,500, subject to a maximum of 100] 100 42.67 NS = Not Scored Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 xiii SURFACE WATER OVERLAND/ FLOOD MIGRATION COMPONENT SCORESHEET Factor Categories and Factors Maximum Value Value Assigned ENVIRONMENTAL THREAT Likelihood of Release 22. Likelihood of Release (Same Value as Line 5) 550 550 Waste Characteristics 23. Ecosystem Toxicity/ Persistence/ Bioaccumulation * 5x10 8 24. Hazardous Waste Quantity * 100 25. Waste Characteristics 1,000 320 Targets 26. Sensitive Environments:

26a. Level I Concentrations ** 0 26b. Level II Concentrations ** 25 26c. Potential Contamination ** NS 26d. Sensitive Environments (Lines 26a + 26b + 26c) ** 25 27. Targets (Value from Line 26d) ** 25 Environmental Threat Score 28. Environmental Threat Score [( Lines 22 x 25 x 27)/ 82,500, subject to a maximum of 60] 60 53 SURFACE WATER OVERLAND/ FLOOD MIGRATION COMPONENT SCORE FOR A WATERSHED 29. WATERSHED SCORE***

(Lines 13 + 21 + 28, subject to a maximum of 100) 100 95.67 SURFACE WATER OVERLAND/ FLOOD MIGRATION COMPONENT SCORE 30. Component Score (Sof)*** (Highest score from Line 29 for all watersheds evaluated, subject to a maximum of 100) 100 95.67 NS = Not Scored Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 1 REFERENCE LISTING Reference Number Description of the Reference 1. U. S. Environmental Protection Agency, Federal Register 40 CFR Part 300, Hazard Ranking System; Final Rule, Volume 55, No. 241, December 14, 1990. 135 pages.

2. U. S. Environmental Protection Agency, Superfund Chemical Data Matrix (SCDM). June 1996.

3. U. S. Environmental Protection Agency, Hazard Ranking System Guidance Manual, Office of Solid Waste and Emergency Response, Publication 9345.1 07, November, 1992. 431 pages 4. Broach, Linda, Field Operations Division, Region 12, Houston, Texas Natural Resource Conservation Commission and Crocker, Phillip, Water Quality Protection, Region 6, Dallas, United States Environmental Protection Agency. Containment Assessment of Patrick Bayou. December 1996. 70 pages.

5. Texas Natural Resource Conservation Commission, The State of Texas Water Quality Inventory, Surface Water Quality Monitoring Program, 13 th Edition, 1996, Volume 2  Basin Summaries, Basin Maps, Graphical Basin Summaries, Segment Fact Sheets, and Water Quality Status Tables (Basins 1 10), SFR 50. December 1996. 7 pages.

6. U. S. Geological Survey, La Porte Quadrangle, Texas, 7.5 Minute Series. Topographic Map. Provisional Edition 1965. (Site location, 1 mile radius, legend and map notations added by TNRCC). 1 page. (Figure 1b).

7. U. S. Environmental Protection Agency, Preliminary Assessment/ Screening Site Inspection Work Plan for Patrick Bayou Site. TX0 000 605 329, Deer Park, Harris County, Texas. March 2000. 188 pages/ w attachments.

8. Texas Natural Resource Conservation Commission. Quality Assurance Project Plan for Texas Natural Resource Conservation Commission Preliminary Assessment/ Site Inspection Program (FY 2000 and 2001). October 1999. 143 pages/ w attachments.

9. U. S. Environmental Protection Agency. Office of Emergency and Remedial Response, Quick Reference Fact Sheet (5204G), Using Qualified Data to Document an Observed Release and Observed Contamination. EPA 540 F 95 033. OSWER 9285 7 14FS. PB95 963320. November 1996. 18 pages.

10. U. S. Environmental Protection Agency, Screening Site Inspection Field Log Book notes and photographs. March 27  30, 2000. 70 pages. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 2 REFERENCE LISTING (continued) Reference Number Description of the Reference 11. Texas Department of Transportation. County Maps of Texas, 1994. General High way Map of Harris County, Texas, revised to January 1, 1994 data. Dated 1992. (Site location and 1 mile radius notations added by TNRCC). page 102. (Figure 2). 2 pages 12. U. S. Environmental Protection Agency, Region 6, Houston Branch, Case Number 27912, Sample Designation Group MFHM71, CLP Data Review and Inorganic Regional Data Assessment Package. From: Marvelyn Humphrey, Alt. ESAT RPO, 6MD HC, To: B. Rhotenberry, 6SFRA May 25, 2000. 25 pages.

13. U. S. Environmental Protection Agency, Region 6, Houston Branch, Case Number 27912, Sample Designation Group MFHW65, CLP Data Review and Inorganic Regional Data Assessment Package. From: Marvelyn Humphrey, Alternate ESAT RPO, 6MD HC, To: B. Rhotenberry, 6SF RA. June 8, 2000. 31 pages.

14. U. S. Environmental Protection Agency, Region 6, Houston Branch, Case Number 27912, Sample Designation Group FGA73, CLP Data Review and Organic Regional Data Assessment Package. From: Marvelyn Humphrey, Alternate ESAT RPO, 6MD HC, To: B. Rhotenberry, 6SF RA. July 6, 2000. 145 pages.

15. U. S. Environmental Protection Agency, Region 6, Houston Branch, Case Number 27912, Sample Designation Group FGW45, CLP Data Review and Organic Regional Data Assessment Package. From: Marvelyn Humphrey, Alternate ESAT RPO, 6MD HC, To: B. Rhotenberry, 6SF RA. July 6, 2000. 163 pages.

16. U. S. Department of the Interior. National Wetlands Inventory map. La Porte, Texas Quadrangle. 1999. 1 page.

17. Texas Natural Resource Conservation Commission, Compliance Evaluation Inspection (CEI), and Boiler and Industrial Furnace (BIF) Inspection conducted on November 30 and December 3, 9 and 10, 1998, letters/ w attachments. From: Aron Athavaley, Field Investigator, Region 12 Office, Houston, To: Files. January 12, 1999. 82 pages.

18. Texas Natural Resource Conservation Commission, Comprehensive Monitoring Evaluation (CME) at: The Lubrizol Corporation, 41 Tidal Road, Deer Park (Harris County), Texas, letter/ w attachments. From: Rama Yadav, Ph. D., P. E., Team Leader, Waste Section, Region 12 Office, Houston, To: Julius Rexer, Sr. Env. Eng., Lubrizol Corporation, Pasadena, Texas. August 16, 2000. 40 pages. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 3 REFERENCE LISTING (continued) Reference Number Description of the Reference 19. Texas Natural Resource Conservation Commission, Compliance Evaluation Inspection (CEI) conducted on November 2, 7 and 9, 1995, letter/ w attachment. From Matthew Chun, Field Investigator, Region 12 Office, Houston, To: Files. December 13, 1995. 23 pages.

20. Texas Natural Resource Conservation Commission, Patrick Bayou Site, Screening Site Inspection (SSI) Data Assessment. 7 pages.

21. Texas Department of Health, Seafood Safety Division. Fish Advisories and Bans, 1997. 6 pages. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 4 SD Characterization and Containment SOURCE DESCRIPTION 2.2 SOURCE CHARACTERIZATION 2.2.1 Source Identification Number of the source: 1 Name and description of the source: Other (Contaminated Sediments)

The Patrick Bayou site Source 1 consists of contaminated sediments retained within the boundaries of Patrick Bayou and the East Fork tributary as illustrated in Figures 1b and 2 containing elevated heavy metals, volatile and semi volatile organic compounds, pesticides and PCBs. The site was initially identified to the TNRCC from studies completed in 1993 and 1994 by the City of Houston investigating wastes accumulating within the Houston Ship Channel (HSC) and its tributaries from nearby petrochemical plants and accidental shipping spills (Ref. 4, p. 9). A July 26, 1994 TNRCC Region 12 Office follow up investigation jointly sponsored by the EPA Region 6 Office confirmed initial findings and greatly expanded the area of documented contamination. During the 1994 investigation, eleven (11) sediment samples and a duplicate and five (5) surface water samples were collected from selected locations within Patrick Bayou, at an up stream location before any identified outfall source, along the East Fork tributary and at the TNRCC routine water quality sampling station (TNRCC Station No. 1006.9150) located in the mouth of Patrick Bayou (Ref. 4, pp. 12, 28 32, 39 and 50). The 1994 selected sample station locations (marked prior sample stations) are shown in Figure 3. Sediment samples were analyzed for priority pollutants and water samples were tested for routine water quality parameters (Ref. 4, pp. 14 and 61 64).

The 1994 sample results revealed more than 40 percent of the sediment samples in Patrick Bayou exceeded either the TNRCC sediment screening levels (85 th percentile for tidal streams, TNRCC 1994a and/ or National Oceanic and Atmospheric Administration [NOAA] Effects Range Low [ERL] and EffectRange Median [ERM] values, Long et al. 1995) or the draft EPA Sediment Quality Guideline [SQG] values, USEPA 1994, that had been published for chromium, copper, lead, mercury, nickel, selenium, zinc, hexachlorobenzene, polychlorinated biphenyls (PCBs), and bis( 2 ethylhexyl) phthalate (Ref. 4, pp. 2 and 15). Very high levels of mercury (8.3 mg/ Kg at Station No. 3 shown in Figure 3), hexachlorobenzene (83,900 µg/ Kg at Station No. 2), hexachlorobutadiene (138,000 µg/ Kg at Station No. 2), PCBs (Aroclor 1248 4,150 µg/ Kg at Station No. 7), polynuclear aromatic hydrocarbons (total PAHs 97,380 µg/ Kg at Station No. 3) and lead (269 mg/ Kg at Station No. 9) were found within Patrick Bayou sediments (Ref. 4, pp. 44 45).

Lesser values of acenapthene, acenaphthylene, anthracene, benzo( a) anthracene, benzo( a) pyrene, chrysene, fluoranthene, fluorene, 2 methylnaphthalene, naphthalene and pyrene were also detected in sediments collected from Stations No. 1, 2, 2.5, 3, 7 and 9 that exceeded published NOAA ERM values indicating a significant accumulation of priority pollutants. The higher values and most significant number Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 5 of pollutants were detected at sample Stations No. 3, 7 and 9 indicating contamination may be originating from a multitude locations along the entire bayou (Ref. 4, pp. 28 32, 44 46 and 52 56). Based on prior studies and the 1994 sampling results, specific discharge sources for the contaminants of concern could not be sufficiently identified, but provided specific information on their potential sources (Ref. 4, p. 2). Therefore, this HRS Documentation Record will consider the identified contaminated sediments to: (1) have originated from historical accumulation within Patrick Bayou from a multitude of potential outfall/ discharge sources and (2) they will be defined as "the source" for further waste characterization in this section.

Location of the source, with reference to a map of the site:

See Figure 1b, Site Location and Surrounding Land Use Map. The contaminated area within Patrick Bayou is identified as beginning at the combined storm water/ outfall discharge drains (box culverts) near the Station No. 7/ SE 17 sample location located approximately 1,800' north of SH 225 and ending just beyond the convergence of Patrick Bayou with the HSC and includes a portion of the East Fork tributary located just west of the railroad bridge beginning at the SE 14 sample location that is approximately 750' downstream from the Station No. 10 location shown in Figure 3. The contaminated area is described in more detail in Section <IP_ADDRESS>.1 and the source was delineated using sample results presented in Table 6. The estimated lineal distance is approximately10,100' (1.91 mi.) (Ref. 10, pp. 3, 11, 26 and 29).

Source type for HRS evaluation purposes: Other (Contaminated sediments).

Containment Gas release to air: The air migration pathway was not evaluated; therefore, gas containment was not evaluated (Ref. 7, pp. 13 and 24).

Particulate release to air: The air migration pathway was not evaluated; therefore, particulate containment was not evaluated (Ref. 7, pp. 13 and 24).

Release to ground water: The ground water migration pathway with respect to the contaminated sediments was not evaluated for lack of identified ground water targets (Ref. 7, pp. 1 and 10).

Release via overland migration and/ or flood: Source consists of contaminated sediments. There is no containment and no liner present to prevent the migration of hazardous substances from the contaminated sediments. Evidence of migration was based on elevated levels of contaminants detected throughout Patrick Bayou releasing to the adjacent HSC (as substantiated during the SSI) and for lack of any physical barrier or containment structure noted along the surface water migratory pathway (Ref. 10, pp. 3, 5, 6 and 8). Therefore, the contaminated sediments were assigned a containment factor value of 10 as specified in Table 4 2 of the HRS Rule (Ref. 1, Section <IP_ADDRESS>.2.1.1). Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 6 Figure 2 Site Features Map Patrick Bayou Site A copy of the site location map is available at the EPA Headquarters Superfund Docket:

U. S. CERCLA Docket Office Crystal Gateway #1, 1st Floor 1235 Jefferson Davis Highway Arlington, VA 22202 Telephone: (703) 603 8917 E Mail: superfund. docket@ epa. gov Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 7 Figure 3 Sediment Sample Locations Patrick Bayou Site A copy of the site location map is available at the EPA Headquarters Superfund Docket:

U. S. CERCLA Docket Office Crystal Gateway #1, 1st Floor 1235 Jefferson Davis Highway Arlington, VA 22202 Telephone: (703) 603 8917 E Mail: superfund. docket@ epa. gov Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 8 SD Characterization and Containment Source No. 1, Other (Contaminated Sediments)

2.2.2 Hazardous Substances Associated with a Source Based on the results of the March 27 30, 2000 SSI, the source area is defined as the contaminated sediments within the HSC, the East Fork Tributary and Patrick Bayou. Table 1 below represents the eighteen (18) individual samples collected during the SSI that define the source area. For a complete list of hazardous substances that meet observed release criteria and their concentrations at each sample location, see Table 6.

Locations of samples are depicted in Figure 3.

TABLE 1 Source Description Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou CLP Sample ID Sample ID No./ Location Sample/ Depth Date Collected Location Reference MFHW68 FGW48 SE 04/ HSC sample Confluence of HSC and Patrick Bayou Grab Sample 0" 18" deep 3/ 28/ 00 Figure 3 Ref. 10, pp. 9, 11, 16 Photos #13, 14 MFHW69 FGW49 SE 05/ HSC sample Confluence of HSC and Patrick Bayou Composite 0" 20" deep 3/ 28/ 00 Figure 3 Ref. 10, pp. 9, 11, 17 Photo #15 MFHW70 FGW50 SE 06/ HSC sample Duplicate sample of SE 05 for QA/ QC requirements. Same as SE 05 3/ 28/ 00 Figure 3 Ref. 10, pp. 9, 11, 18 Photo #16 MFHW71 FGW51 SE 07/ HSC sample Down channel sample 300' west of OxyVinyl outfall Grab Sample 0" 16" deep 3/ 28/ 00 Figure 3 Ref. 10, pp. 9, 11, 19 Photos #9, 10 MFHW72 FGW52 SE 08/ HSC sample Down channel sample 300' west of OxyVinyl outfall Composite 0" 18" deep 3/ 28/ 00 Figure 3 Ref. 10, pp. 9, 11, 20 Photo #12 MFHW73 FGW53 SE 09/ HSC sample Duplicate sample of SE 08 for QA/ QC requirements. Same as SE 08 3/ 28/ 00 Figure 3 Ref. 10, pp. 9, 11, 21 Photo #12 MFHW78 FGW58 SE 14/ East Fork Tributary Near the confluence of East Fork with Patrick Bayou Composite 0" 14" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 9, 11, 26 Photos #33, 34 Table 1 continued ... Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 9 SD Hazardous Substances Source No. 1: Other (Contaminated Sediments)

TABLE 1 (continued)

Source Description Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou CLP Sample Sample Location/ Event Sample Depth Date Collected Location Reference MFHW81 FGW61 SE 17/ Patrick Bayou 40 meters downstream from Lubrizol/ Deer Park Outfall Composite 0" 6" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 9, 11, 29 Photo #30 MFHW82 FGW62 SE 18/ Patrick Bayou 20 meters downstream from Shell Road Bridge/ west bank Composite 0" 8" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 10, 11, 30 Photo #32 MFHW83 FGW63 SE 19/ Patrick Bayou approx. 800' north of confluence with East Fork Composite 0" 18" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 10, 11, 31 Photo #39, 40 MFHW84 FGW64 SE 20/ Patrick Bayou 60 meters N. Oxyvinyl #001 24 meters from E. shoreline Composite 0" 20" deep 3/ 29/ 00 Figure 3 Ref. 10, pp. 10, 11, 32 Photo #17 MFHW85 FGW65 SE 21/ Patrick Bayou Duplicate sample of SE 20 for QA/ QC requirements. Same as SE 20. 3/ 29/ 00 Figure 3 Ref. 10, pp. 10, 11, 33 Photo #18 MFHW86 FGW66 SE 22/ Patrick Bayou 45 meters S. Oxyvinyl #003 21 meters from E. shoreline Composite 0" 18" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 10, 11, 34 Photo #25 MFHW87 FGW67 SE 23/ Wetland sample 700' north of East Fork Along edge of east bank Composite 0" 20" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 10, 11, 35 Photos #37, 38 MFHW88 FGW68 SE 24/ Patrick Bayou 83 meters south of island 17 meters from E. shoreline Composite 0" 16" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 10, 11, 36 Photos #21, 22 MFHW89 FGW69 SE 25/ Wetland sample approx. 60' N. of SE 14 Along edge of east bank Composite 0" 22" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 10, 11, 37 Photos #35, 36 MFHW90 FGW70 SE 26/ Patrick Bayou approx. 200' E. of bridge in lower bayou area Grab Sample 0" 18" deep 3/ 28/ 00 Figure 3 Ref. 10, pp. 10, 11, 38 Photo #26 (not avail)

Table 1 continued Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 10 TABLE 1 (continued)

Source Description Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou CLP Sample Sample Location/ Event Sample Depth Date Collected Location Reference MFHW91 FGW71 SE 27/ Wetland sample Along NE shoreline of island in Patrick Bayou Composite 0" 15" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 10, 11, 39 Photo #19 Notes: QA/ QC = Quality Assurance/ Quality Control CLP = Contract Laboratory Procedures Source samples SE 04 thru SE 09 in the Houston Ship Channel, SE 14 near the confluence with the East Fork tributary and SE 19 thru SE 27 within Patrick Bayou were all collected with a stainless steel sediment coring device. In addition, dedicated decontaminated stainless steel screw on tips were used to hold clean polyethylene zero contamination tubes within the device. Source sample SE 17 and SE 18 in the upper portion of Patrick Bayou were collected using clean dedicated stainless steel bowls and spoons instead of the sediment coring device (Ref. 10, pp. 29 30). Since the upper portion of the East Fork tributary is shallow containing many small rocks and gravel and the upper portion of Patrick Bayou is mostly gunite or concrete lined, obtaining sufficient volume using the coring sampling tool was determined unsuitable (Ref. 10, pp. 16 21 and 31 40). The source samples exhibited elevated concentrations of both inorganic and organic constituents.

All samples were collected according to the EPA approved state Quality Assurance Project Plan and sample locations were approved by the EPA prior to sample collection (Ref. 8, pp. 1 52; Ref. 7, pp. 1 27).

2.2.3 Hazardous Substances Available to a Pathway Because containment for this source is greater than 0, the following hazardous substances associated with the source can migrate via the surface water migration pathway:

Cadmium Chromium Copper Lead Manganese Mercury Nickel Silver Vanadium Zinc Cyanide Carbon Disulfide Cyclohexane Benzene Metylcyclohexane Toluene Chlorobenzene Ethylbenzene Xylenes (Total) Isopropylbenzene 1,3 Dichlorobenzene 1,4 Dichlorobenzene Hexachlorobutadiene 2 Methylnaphthalene Hexachlorobenzene Aldrin Endosulfan I Endrin Aroclor 1248 Aroclor 1254 Aroclor 1260 Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 11 SD Waste Characterization Source No. 1: Other (Contaminated Sediments)

2.3 LIKELIHOOD OF RELEASE Refer to Section <IP_ADDRESS> of this documentation record for specific information related to the Likelihood of Release to the Surface Water Pathway.

2.4 WASTE CHARACTERIZATION 2.4.1 Selection of Substance Potentially Posing Greatest Hazard All of the hazardous substances listed above are associated with this source.

Specific toxicity factors, HRS Section <IP_ADDRESS> and selection of the hazardous substances with the highest factor values (toxicity, persistence, and bioaccumulation), HRS Section <IP_ADDRESS>, are presented under the Surface Water Migration Pathway section of this documentation record report.

2.4.2 Hazardous Waste Quantity <IP_ADDRESS> Source Hazardous Waste Quantity <IP_ADDRESS>.1 Hazardous Constituent Quantity (Tier A)  Not Evaluated (NE)

The information available is not sufficient to evaluate Tier A, as required in Section <IP_ADDRESS>.1 of the HRS Rule. As a result, the evaluation of Hazardous Waste Quantity proceeds to the evaluation of Tier B, hazardous waste stream quantity (Ref. 1).

<IP_ADDRESS>.2 Hazardous Wastestream Quantity (Tier B)  NE The information available is not sufficient to evaluate Tier B, as required in Section <IP_ADDRESS>.2 of the HRS Rule. Therefore, quantity is unknown, but greater than zero. As a result, the evaluation of Hazardous Waste Quantity proceeds to the evaluation of Tier C, volume (Ref. 1).

<IP_ADDRESS>.3 Volume (Tier C)  NE The information available is not sufficient to evaluate Tier C, as required in Section <IP_ADDRESS>.3 of the HRS Rule. As a result, the evaluation of Hazardous Waste Quantity proceeds to the evaluation of Tier D, area (Ref. 1). Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 12 <IP_ADDRESS>.4 Area (Tier D)

Tier D is not evaluated for source type "Other" (Ref. 1, Section <IP_ADDRESS>.4, Table 2 5).

Although the source volume was not adequately determined and its extent is unknown, the value is greater than 0, but unknown.

Dimension of source (yds 3 or gallons): > 0, but unknown. Reference( s): Ref. 1, Section <IP_ADDRESS>.4, Table 2 5. Volume Assigned Value: > 0, but unknown <IP_ADDRESS>.5 Source Hazardous Waste Quantity Value As described in the HRS Rule, the highest value assigned to a source from among the four tiers of hazardous constituent quantity (Tier A), hazardous wastestream quantity (Tier B), volume (Tier C) or area (Tier D) shall be selected as the source hazardous waste quantity value. (Ref. 1, Sections <IP_ADDRESS>.1 4).

TABLE 2 Source No. 1  Other (Contaminated Sediments) Source Hazardous Waste Quantity Tier Measure Migration Pathway (Surface Water)

Tier A, Constituent Quantity NE Tier B, Wastestream Quantity NE Tier C, Volume > 0, but unknown Tier D, Area NE NE = not evaluated.

Source Hazardous Waste Quantity Value: > 0, but unknown Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 13 SD Summary SITE SUMMARY OF SOURCE DESCRIPTIONS TABLE 3 Source Number Source Hazardous Waste Quantity Value Containment Ground Water Surface Water Gas Air Particulate 1 > 0 Not Evaluated 10 Not Evaluated Not Evaluated Total > 0, but unknown The sum of the Source No. 1 hazardous waste quantity of > 0 is assigned as the Source Hazardous Waste Quantity Value (Ref. 1, Section <IP_ADDRESS>). The sum of the source hazardous waste quantity values for Patrick Bayou site, rounded to the nearest integer is > 0, but unknown.

The Hazardous Waste Quantity Factor Value assigned to a Source Hazardous Waste Quantity Value of > 0, but unknown is 100 (Ref. 1, Section <IP_ADDRESS>).

[Note: See discussion under Section <IP_ADDRESS>.1 of this report for rationale used to determine a Hazardous Waste Quantity Factor Value when a pathway target is subjected to Level I or Level II concentrations].

Source Hazardous Waste Quantity Value: > 0, but unknown Hazardous Waste Quantity Factor Value: 100 Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 14 GW General 3.0 GROUND WATER MIGRATION PATHWAY 3.0.1 General Considerations Since the "site" is defined as the accumulated contaminated sediments within Patrick Bayou, the Groundwater and Groundwater to Surface Water Pathways will not be evaluated. The drinking water threat was not evaluated due to lack of targets and because the inclusion of this threat would not significantly effect the site score. The Surface Water Pathway will be evaluated to assess potential contaminant migration. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 15 SWOF Surface Water Overland/ Flood Migration Pathway 4.0 SURFACE WATER MIGRATION PATHWAY 4.1 OVERLAND/ FLOOD MIGRATION COMPONENT There were no ground water to surface water migration components identified located within the watershed being evaluated. Therefore, only the Overland/ Flood Migration to Surface Water Component will be evaluated for the watershed of concern (Ref. 1, Section 4.1).

4.1.1 General Considerations Patrick Bayou drains north then northeast discharging to Stream Segment 1006 of the San Jacinto River Basin (Houston Ship Channel Tidal) with the widest portion of Patrick Bayou entering the Houston Ship Channel (HSC) as shown in Figures 1b and 2 (Ref. 10, pp. 6 and 8). Stream Segment 1006 extends 6 miles easterly from a point located immediately upstream of Green Bayou in Harris County to its confluence with the main fork of the San Jacinto River (Ref. 5, p. 5). The tidal portion of the HSC is highly developed, industrialized and has allowed the City of Houston to become an international port (Ref. 4, p. 7; Ref. 5, p. 3). See Figure 4 for the location of Patrick Bayou and the HSC within Stream Segment 1006.

Segment 1006 is classified "Water Quality Limited" due to numerous water quality standard violations with advanced wastewater treatment required prior to any other intended use. Designated uses include: industrial water supply and navigation. Along this segment there are 88 domestic outfalls and 35 industrial outfalls with a total average daily discharge of 273.33 million gallons (Ref. 5, p. 5). A restricted consumption advisory (AD 3, issued September 19, 1990) for the general population and a no consumption advisory for children and women of childbearing age have been issued for the Houston Ship Channel and all contiguous waters and Upper Galveston Bay area by the Texas Department of Health due to elevated levels of dioxin in blue crabs and all species of catfish (Ref. 4, p. 13; Ref. 5, pp. 3 5; Ref. 21, pp. 5 6).

Segment 1006 drains east entering the lower portion of Stream Segment 1005 before discharging to Galveston Bay (Ref. 10, pp. 6 and 8). Segment 1005 begins upstream at a point located 100 meters (110 yds) downstream (south) of the Interstate Highway (IH) 10 bridge in Harris County and extends 12 miles southeast to its confluence with Galveston Bay at Morgan's Point located at the Harris/ Chambers County boundary line (Ref. 5, p. 7). See Figure 4 for the location of the lower portion of Stream Segment 1005.

Segment 1005 is also classified "Water Quality Limited" due to water quality standards violations with advanced waste treatment required. Designated water uses include: non contact recreation and high aquatic life. Along this segment there is 1 domestic outfall and 14 industrial outfalls with a total average daily discharge of 37.14 million gallons (Ref. 5, p. 7). Segment 1005 has the same restricted Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 16 consumption advisory for the general population and a no consumption advisory for children and women of childbearing age issued by the Texas Department of Health due to elevated levels of dioxin in blue crabs and all species of catfish (Ref. 5, p. 7; Ref. 21, pp. 5 6). Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 17 Figure 4 Surface Water Pathway Patrick Bayou Site A copy of the site location map is available at the EPA Headquarters Superfund Docket:

U. S. CERCLA Docket Office Crystal Gateway #1, 1st Floor 1235 Jefferson Davis Highway Arlington, VA 22202 Telephone: (703) 603 8917 E Mail: superfund. docket@ epa. gov Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 18 SWOF Surface Water Overland/ Flood Migration Pathway <IP_ADDRESS> Definition of Hazardous Substance Migration Path for Overland/ Flood Migration Component Overland Segment, Probable Point of Entries (PPEs), Number of Watersheds As described in the HRS Rule, Section <IP_ADDRESS>, there is no overland segment for hazardous substance migration from a source area that consists of contaminated sediments with no identified source, and the hazardous substance migration path consists solely of the in water segment (Ref. 1). For the Patrick Bayou site, the source area begins at the two farthest upstream sample locations and continues to the most distant downstream sample location meeting observed release criteria. Since, for this site, the release to surface water defines the source and there is no overland route, and because all PPEs to the bayou have not been identified. it was determined more important to use the phrase "upper boundary" for the area of contaminated sediments instead of Probable Point of Entry (PPE). There are two (2) Upper Boundaries for this site identified as the farthest upstream sample location in Patrick Bayou (SE 17) designated as Upper Boundary No. 1 and the farthest upstream sample location in the East Fork tributary (SE 14) designated as Upper Boundary No. 2. In addition, as specified by the HRS Rule, since the two hazardous substance migration pathways associated with the upper boundaries reach a common point within the target distance limit, only one watershed will be evaluated for this documentation record report (Ref. 1, Section <IP_ADDRESS>).

<IP_ADDRESS> Target Distance Limit As specified in the HRS Rule, Section <IP_ADDRESS>, for sites consisting of contaminated sediments with no identified source, the in water segment is defined as located between the two furthest observed release criteria sample locations (Ref. 1). Additionally, the HRS Rule specifies the target distance limit (TDL) for this same site with a clearly defined flow direction as the in water segment measured from the furthest sample location upstream meeting observed release criteria to the most distant downstream sample location also meeting observed release criteria, or to the 15 mile down stream distance, whichever is greater (Ref. 1).

For the Patrick Bayou site, the target distance limit was determined from a review of observed release criteria for the two farthest sampling locations identified within the surface water hazardous substance migration pathway. The furthest distance was determined as between sample locations SE 17 (Upper Boundary No. 1) located at the box channel discharge point in the upper portion of Patrick Bayou extending to the 15 mile TDL arc within Galveston Bay as shown in Figure 4.

Definition of In Water Segments/ Target Distance Limit The Target Distance Limit (TDL) for this site is comprised of four (4) Hazard Ranking System (HRS) InWater Segments which are included within two (2) State of Texas Water Quality Stream Segments. The components of these HRS In Water segments are discussed below: Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 19 (1) In Water Segment No. 1 (Upper Patrick Bayou to Confluence with HSC)  Level II: (approximately 1.91 miles) is defined as the in water distance from Upper Boundary No. 1 (sample location SE 17) along Patrick Bayou to its confluence with the HSC and includes a portion of the lower East Fork Tributary. The entire segment comprises the Patrick Bayou source ite and is located within Stream Segment 1006 (Houston Ship Channel Tidal) of the San Jacinto River Basin (Figure 4; Ref. 10, p. 8; Ref. 5, pp. 3 5).

(2) In Water Segment No. 2 (Confluence with Patrick Bayou to Confluence with San Jacinto River) Potential (approximately 2.5 miles) is defined as the in water distance along the HSC from the confluence with Patrick Bayou to the confluence with the main fork of the San Jacinto River. The entire segment is located within Stream Segment 1006 (HSC Tidal) of the San Jacinto River Basin (Figure 4; Ref. 10, p. 8; Ref. 5, pp. 3 5).

(3) In Water Segment No. 3 (Confluence with San Jacinto River to Galveston Bay)  Potential: (approximately 9.5 miles) is defined as the in water distance along the main fork of the San Jacinto River from its confluence with the HSC to Morgan's Point at the entrance to Galveston Bay. The entire segment is located within Stream Segment 1005 (HSC/ San Jacinto River Tidal) of the San Jacinto River Basin (Figure 4; Ref. 10, p. 8; Ref. 5, pp. 3 5).

(4) In Water Segment No. 4 (Galveston Bay to the 15 Mile Arc)  Potential: (approximately 1.0 miles) is defined as the in water area within an arc extending past Morgan's Point into Galveston Bay (Figure 4; Ref. 10, p. 8; Ref. 5, pp. 3 5).

<IP_ADDRESS> Evaluation of Overland/ Flood Migration Component As described in the HRS Rule, Section <IP_ADDRESS>, since there is only one watershed area, the resulting score for that watershed will become the overland/ flood migration component score for the site. In addition, since there were no drinking water targets identified within the defined TDL, the overland/ flood migration component will be evaluated for human food chain and environmental threats based on three factor categories: likelihood of release, waste characteristics and targets. The resulting Overland/ Flood Migration pathway score will be used to evaluate the Surface Water Migration Pathway site score (Ref. 1; Ref. 10, pp. 6 and 8).

4.1.2 Drinking Water Threat The drinking water threat was not evaluated due to lack of significant drinking water targets located along the overland/ flood migration pathway within the identified TDL. Documentation for an observed release follows, then evaluation will proceed to HRS Rule, Sections 4.1.3 and 4.1.4 for evaluation of the human food chain and environmental threats (Ref. 1). Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 20 <IP_ADDRESS> Drinking Water Threat  Likelihood of Release <IP_ADDRESS>.1 Observed Release An observed release can be documented in the HRS system by two methods: (a) direct observation and (b) chemical analysis (Ref. 1). The chemical analysis method was used for this report.

Chemical Analysis Establishing an observed release by chemical analysis requires attributing the hazardous substances to the site. First, naturally occurring background concentrations of the hazardous substances must be determined. Second, it must be demonstrated that the concentrations of the hazardous substances in a release sample are significantly above the highest identified background level and some portion of the significant increase must be attributed to the site. In order to document a significant increase above background levels, the hazardous substances must be present in concentrations of at least three times (3x) above the appropriate background level if the hazardous substances are present in the background sample. Or, if the hazardous substances have not been detected in the background samples, then the hazardous substances must be present at concentrations both above the release's and the highest background samples' laboratory Sample Quantitation Limit (SQL) (Ref. 1, Section 2.3).

Background Concentrations A total of eight (8) background samples were collected at up channel locations along the HSC, along Patrick Bayou and the East Fork Tributary upstream from known outfall locations for identification of site contaminants (Ref. 7, pp. 12, 18 19, 21, 23). Table 4 provides a summary of the background samples collected for the SSI and Table 5 indicates the highest designated background levels for the inorganic and organic hazardous substances of concern for the site. A variety of background locations were selected to adequately represent differing surface conditions and flow characteristics encountered at the site. These conditions included varying types of flow channels, sediment conditions and a wide range of surface water flow characteristics found within the East Fork Tributary, upper drainage area of Patrick Bayou and along the Houston Ship Channel. Another bayou was not selected for unaffected background sediment samples since previous studies conducted by the City of Houston within the HSC system indicated elevated toxic substances and water quality problems within all nine tributaries (Ref. 4, p. 1).

Background samples SE 01, SE 02 and SE 03 were selected to represent typical sediment locations identified within the Patrick Bayou HSC confluence area with similar large tributary flow characteristics. Background samples were collected using a sediment coring sampling tool along the shoreline of the Houston Ship Channel in shallow areas where sediments would collect up channel of the confluence with Patrick Bayou. SE 01 was a composite sample so that there would be sufficient volume for a requested split sample. The coring sampling tool was pushed as far as it could be pushed into the sediments to collect each sample (Ref. 10, pp. 13 15). Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 21 TABLE 4 Surface Water Pathway Background Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou CLP Sample ID Sample Location/ Event Sample Depth Date Collected Location Reference MFHW65 FGW45 SE 01/ HSC sample HSC up channel from Patrick Bayou Composite 0" 18" deep 3/ 28/ 00 Figure 3, Ref. 10, pp. 9, 11, 13 Photo #6 MFHW66 FGW46 SE 02/ HSC sample HSC up channel from Patrick Bayou Grab sample 0" 20" deep 3/ 28/ 00 Figure 3, Ref. 10, pp. 9, 11, 14 Photo #7 MFHW67 FGW47 SE 03/ HSC sample HSC up channel from Patrick Bayou Grab sample 0" 18" deep 3/ 28/ 00 Figure 3, Ref. 10, pp. 9, 11, 15 Photo #8 MFHW74 FGW54 SE 10/ East Fork sample Upstream from Praxair outfall entry to tributary Grab sample 0" 8" deep 3/ 28/ 00 Figure 3, Ref. 10, pp. 9, 11, 22 Photo #49 MFHW75 FGW55 SE 11/ East Fork sample Upstream from Praxair outfall entry to tributary Grab sample 0" 8" deep 3/ 28/ 00 Figure 3, Ref. 10, pp. 9, 11, 23 Photo #48 MFHW76 FGW56 SE 12/ East Fork sample Upstream from Praxair outfall entry to tributary Grab sample 0" 10" deep 3/ 28/ 00 Figure 3, Ref. 10, pp. 9, 11, 24 Photo #47 MFHW79 FGW59 SE 15/ Patrick Bayou Upstream from Deer Park wastewater discharge point Composite 0" 4" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 9, 11, 27 Photo #27 MFHW80 FGW60 SE 16/ Patrick Bayou Duplicate sample of SE 15 for QA/ QC requirements. Same as SE 15 3/ 30/ 00 Figure 3 Ref. 10, pp. 9, 11, 28 Photos #27 Notes: QA/ QC = Quality Assurance/ Quality Control Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 22 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release Background sample locations SE 10, SE 11 and SE 12 were selected along the upper portions of the East Fork Tributary upstream of any known outfall source in shallow intermittent low flow locations typical of sediment locations noted located below outfall sources within the East Fork Tributary. Since the shallow stream channel contained many small rocks and gravel and the underlying soils Background sample location SE 15 with duplicate sample SE 16 was selected within the concrete lined upper portion of Patrick Bayou upstream of any know outfall source to represent typical gunite lined lower portions of the bayou located between sampling Stations No. 9 and No. 6 illustrated in Figure 3 and shown in Photo #29. Background sediment samples SE 15 and SE 16 were collected using a dedicated stainless steel bowl and spoon since the channel was concrete lined and using the coring sampling tool was determined unsuitable. A composite sample was collected from deposits up to 4" thick of fine sediments lying within typical low flow portions of the channel within an approximate 20' radius to obtain sufficient volume for the duplicate sample. Leaves, twigs and other organic matter were removed before collecting the sample (Ref. 10, pp. 27 28).

TABLE 5 Surface Water Pathway Summary of Highest Inorganic and Organic Constituents Detected in Background Sediment Samples Inorganic Constituent and Cyanide Station ID/ CLP No. Highest Concentration [SQL] mg/ Kg 3 x Highest Background Concentration mg/ Kg Reference Cadmium SE16 MFHW80 0.63 [1.3] 1.89 Ref. 12, pp. 1 7, 10 13, 17 Chromium SE16 MFHW80 12.4 [2.6] 37.2 Ref. 12, pp. 1 7, 10 13, 17 Copper SE16 MFHW80 17.7 [6.5] 53.1 Ref. 12, pp. 1 7, 10 13, 17 Lead SE15 MFHW79 38.6 [0.9] 115.8 Ref. 12, pp. 1 7, 10 13, 16 Manganese SE16 MFHW80 207 [3.9] 621 Ref. 12, pp. 1 7, 10 13, 17 Mercury SE01 MFHW65 0.56J* [0.12] 1.68* Ref. 12, pp. 1 7, 12 15, 26 Nickel SE11 MFHW75 11.5 [10.3] 34.5 Ref. 13, pp. 1 7, 12 15, 26 Silver SE12 MFHW76 ND [0.33] N/ A [0.33] Ref. 13, pp. 1 7, 12 15, 27 Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 23 Surface Water Pathway Summary of Highest Inorganic and Organic Constituents Detected in Background Sediment Samples Inorganic Constituent and Cyanide Station ID/ CLP No. Highest Concentration [SQL] mg/ Kg 3 x Highest Background Concentration mg/ Kg Reference Vanadium SE16 MFHW80 27.7 [13.1] 83.1 Ref. 12, pp. 1 7, 10 13, 17 Zinc SE16 MFHW80 99.0 [5.2] 297 Ref. 12, pp. 1 7, 10 13, 17 Cyanide SE15 MFHW79 0.3Jv [1.45] 0.9 Ref. 12, pp. 1 7, 10 13, 16 Carbon Disulfide SE 15/ FGW59 NDMJ [35] N/ A [35] Ref. 14, pp. 1 13, 26 34, 41 43 Cyclohexane SE 12/ FGW56 ND [19] N/ A [19] Ref. 15, pp. 1 9, 23 30, 73 75 Benzene SE 12/ FGW56 ND [19] N/ A [19] Ref. 15, pp. 1 9, 23 30, 73 75 Methylcyclohexane SE 12/ FGW56 ND [19] N/ A [19] Ref. 15, pp. 1 9, 23 30, 73 75 Toluene SE 12/ FGW56 ND [19] N/ A [19] Ref. 15, pp. 1 9, 23 30, 73 75 Chlorobenzene SE 12/ FGW56 ND [19] N/ A [19] Ref. 15, pp. 1 9, 23 30, 73 75 Ethylbenzene SE 12/ FGW56 ND [19] N/ A [19] Ref. 15, pp. 1 9, 23 30, 73 75 Xylenes (total) SE 12/ FGW56 ND [19] N/ A [19] Ref. 15, pp. 1 9, 23 30, 73 75 Isopropylbenzene SE 12/ FGW56 ND [19] N/ A [19] Ref. 15, pp. 1 9, 23 30, 73 75 1,3 Dichlorobenzene SE 12/ FGW56 ND [19] N/ A [19] Ref. 15, pp. 1 9, 23 30, 73 75 1,4 Dichlorobenzene SE 12/ FGW56 ND [19] N/ A [19] Ref. 15, pp. 1 9, 23 30, 73 75 exachlorobutadiene SE 12/ FGW56 ND [610] N/ A [610] Ref. 15, pp. 1 9, 23 30, 120 124 2 Methylnaphthalene SE 12/ FGW56 ND [610] N/ A [610] Ref. 15, pp. 1 9, 23 30, 120 124 Hexachlorobenzene SE 12/ FGW56 ND [610] N/ A [610] Ref. 15, pp. 1 9, 23 30, 120 124 Aldrin SE 12/ FGW56 NDJv [3.1] N/ A [3.1] Ref. 15, pp. 1 9, 23 30, 157 Endosulfan I SE 12/ FGW56 NDJv [3.1] N/ A [3.1] Ref. 15, pp. 1 9, 23 30, 157 Endrin SE 12/ FGW56 ND [6.1] N/ A [6.1] Ref. 15, pp. 1 9, 23 30, 157 Aroclor 1248 SE 12/ FGW56 ND [61] N/ A [61] Ref. 15, pp. 1 9, 23 30, 157 Aroclor 1254 SE 12/ FGW56 ND [61] N/ A [61] Ref. 15, pp. 1 9, 23 30, 157 Aroclor 1260 SE 12/ FGW56 ND [61] N/ A [61] Ref. 15, pp. 1 9, 23 30, 157 ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this source. J^ indicates a high bias and Jv indicates a low bias.

M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N/ A = Not applicable. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 24 A complete listing of all background values is included as Reference 20.

All samples were collected according to the EPA approved state Quality Assurance Project Plan and sample locations were approved by the EPA prior to sample collection (Ref. 8, pp. 1 52; Ref. 7, pp. 1 27).

Contaminated Samples The following samples meet the observed release criteria and are presented below indicating inorganic and organic hazardous substances with their concentrations and SQLs.

The following samples were qualified as "releases" based on the criteria outlined in the HRS Rule, Section 2.3 and Table 2 3 (Ref. 1).

TABLE 6 Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou CLP Sample ID Sample Location/ Event Sample Depth Date Collected Location Reference MFHW68 FGW48 SE 04/ HSC sample Confluence of HSC and Patrick Bayou Grab Sample 0" 18" deep 3/ 28/ 00 Figure 3, Ref. 10, pp. 9, 11, 16 Photos #13, 14 MFHW69 FGW49 SE 05/ HSC sample Confluence of HSC and Patrick Bayou Composite 0" 20" deep 3/ 28/ 00 Figure 3, Ref. 10, pp. 9, 11, 17 Photo #15 MFHW70 FGW50 SE 06/ HSC sample Duplicate sample of SE 05 for QA/ QC requirements. Same as SE 05 3/ 28/ 00 Figure 3, Ref. 10, pp. 9, 11, 18 Photo #16 MFHW71 FGW51 SE 07/ HSC sample Down channel sample 300' west of OxyVinyl outfall Grab sample 0" 16" deep 3/ 28/ 00 Figure 3, Ref. 10, pp. 9, 11, 19 Photos #9, 10 MFHW72 FGW52 SE 08/ HSC sample Down channel sample 300' W. of OxyVinyl outfall Composite 0" 18" deep 3/ 28/ 00 Figure 3, Ref. 10, pp. 9, 11, 20 Photo #12 Table 6 continued ...

SWOF Surface Water Overland/ Flood Migration Pathway Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 25 SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou CLP Sample ID Sample ID No./ Location Sample/ Depth Date Collected Location Reference MFHW73 FGW53 SE 09/ HSC sample Duplicate sample of SE 08 for QA/ QC requirements. Same as SE 08 3/ 28/ 00 Figure 3, Ref. 10, pp. 9, 11, 21 Photo #12 MFHW78 FGW58 SE 14/ East Fork Tributary Near the confluence of East Fork with Patrick Bayou Composite 0" 14" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 9, 11, 26 Photos #33, 34 MFHW81 FGW61 SE 17/ Patrick Bayou 40 meters downstream from Lubrizol/ Deer Park Outfall Composite 0" 6" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 9, 11, 29 Photo #30 MFHW82 FGW62 SE 18/ Patrick Bayou 20 meters downstream from Shell Road Bridge/ west bank Composite 0" 8" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 10, 11, 30 Photo #32 MFHW83 FGW63 SE 19/ Patrick Bayou approx. 800' north of confluence with East Fork Composite 0" 18" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 10, 11, 31 Photos #39, 40 MFHW84 FGW64 SE 20/ Patrick Bayou 60 meters N. Oxyvinyl #001 24 meters from E. shoreline Composite 0" 20" deep 3/ 29/ 00 Figure 3 Ref. 10, pp. 10, 11, 32 Photo #17 MFHW85 FGW65 SE 21/ Patrick Bayou Duplicate sample of SE 20 for QA/ QC requirements. Same as SE 20. 3/ 29/ 00 Figure 3 Ref. 10, pp. 10, 11, 33 Photo #18 MFHW86 FGW66 SE 22/ Patrick Bayou 45 meters S. Oxyvinyl #003 21 meters from E. shoreline Composite 0" 18" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 10, 11, 34 Photo #25 MFHW87 FGW68 SE 23/ Wetland sample 700' north of East Fork Along edge of east bank Composite 0" 20" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 10, 11, 35 Photo #37, 38 MFHW88 FGW68 SE 24/ Patrick Bayou 83 meters south of island 17 meters from E. shoreline Composite 0" 16" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 10, 11, 36 Photo #21, 22 Table 6 continued ... Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 26 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou CLP Sample ID Sample ID No./ Location Sample/ Depth Date Collected Location Reference MFHW89 FGW69 SE 25/ Wetland sample approx. 60' N. of SE 14 Along edge of east bank Composite 0" 22" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 10, 11, 37 Photo #35, 36 MFHW90 FGW70 SE 26/ Patrick Bayou approx. 200' E. of bridge in lower bayou area Grab Sample 0" 18" deep 3/ 28/ 00 Figure 3 Ref. 10, pp. 10, 11, 38 Photo #26 (not avail)

MFHW91 FGW71 SE 27/ Wetland sample Along NE shoreline of island in Patrick Bayou Composite 0" 15" deep 3/ 30/ 00 Figure 3 Ref. 10, pp. 10, 11, 39 Photo #19 Table 6 continued ... Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 27 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 04 MFHW68 Inorganics Cadmium 0.93L mg/ Kg [1.9] Ref. 13, pp. 1 7, 12 15, 19 Chromium 183 mg/ Kg [3.8] Ref. 13, pp. 1 7, 12 15, 19 Copper 99.3 mg/ Kg [9.7] Ref. 13, pp. 1 7, 12 15, 19 Lead 117 mg/ Kg [1.2] Ref. 13, pp. 1 7, 12 15, 19 Manganese 172 mg/ Kg [5.8] Ref. 13, pp. 1 7, 12 15, 19 Mercury 11.31* mg/ Kg [0.19] Ref. 13, pp. 1 7, 12 15, 19 Nickel 51.2 mg/ Kg [15.5] Ref. 13, pp. 1 7, 12 15, 19 Silver ND [3.8] Ref. 13, pp. 1 7, 12 15, 19 Vanadium 11.9L mg/ Kg [19.4] Ref. 13, pp. 1 7, 12 15, 19 Zinc 334 mg/ Kg [7.8] Ref. 13, pp. 1 7, 12 15, 19 Cyanide ND [1.9] Ref. 13, pp. 1 7, 12 15, 19 SE 04 FGW48 Volatiles Carbon Disulfide 59B µg/ Kg [20] Ref. 15, pp. 1 9, 23 30, 43 Cyclohexane ND [20] Ref. 15, pp. 1 9, 23 30, 43 Benzene 170 µg/ Kg [20] Ref. 15, pp. 1 9, 23 30, 43 Methylcyclohexane 110 µg/ Kg [20] Ref. 15, pp. 1 9, 23 30, 43 Toluene 75 µg/ Kg [20] Ref. 15, pp. 1 9, 23 30, 43 Chlorobenzene 220 µg/ Kg [20] Ref. 15, pp. 1 9, 23 30, 44 Ethylbenzene 52 µg/ Kg [20] Ref. 15, pp. 1 9, 23 30, 44 Xylenes (total) 310 µg/ Kg [20] Ref. 15, pp. 1 9, 23 30, 44 Isopropylbenzene 290 µg/ Kg [20] Ref. 15, pp. 1 9, 23 30, 44 1,3 Dichlorobenzene 1,900 µg/ Kg [100] Ref. 15, pp. 1 9, 23 30, 44 1,4 Dichlorobenzene 260 µg/ Kg [20] Ref. 15, pp. 1 9, 23 30, 44 Table 6 continued ... Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 28 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 04 FGW48 Semivolatiles Hexachlorobutadiene 19,000 µg/ Kg [16,000] Ref. 15, pp. 1 9, 23 30, 100 2 Methylnaphthalene 2,800LJ µg/ Kg [16,000] Ref. 15, pp. 1 9, 23 30, 100 Hexachlorobenzene 3,900J µg/ Kg [16,000] Ref. 15, pp. 1 9, 23 30, 101 SE 04 FGW48 Pesticides/ PCBs Aldrin NDMJ [240] Ref. 15, pp. 1 9, 23 30, 145 Endrin 9.2J* µg/ Kg [66] Ref. 15, pp. 1 9, 23 30, 145 Aroclor 1248 5,200 µg/ Kg [66] Ref. 15, pp. 1 9, 23 30, 145 Aroclor 1254 ND [660] Ref. 15, pp. 1 9, 23 30, 145 Aroclor 1260 ND [660] Ref. 15, pp. 1 9, 23 30, 145 ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is an estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this sample. J^ indicates a high bias and Jv indicates a low bias. IDL = Instrument detection limit. L = Reported concentration is between the IDL and CRDL. CRDL = Contract required detection limit. M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N = Identification is tentative. T = Identification is questionable because of absence of other commonly coexisting pesticides. Shaded samples = The sample met observed release criteria for that hazardous substance. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 29 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 05 MFHW69 Inorganics Cadmium 1.5L mg/ Kg [2.0] Ref. 13, pp. 1 7, 12 15, 20 Chromium 158 mg/ Kg [4.0] Ref. 13, pp. 1 7, 12 15, 20 Copper 69.7 mg/ Kg [10.4] Ref. 13, pp. 1 7, 12 15, 20 Lead 85.9 mg/ Kg [1.2] Ref. 13, pp. 1 7, 12 15, 20 Manganese 166 mg/ Kg [6.2] Ref. 13, pp. 1 7, 12 15, 20 Mercury 6.61J* mg/ Kg [0.2] Ref. 13, pp. 1 7, 12 15, 20 Nickel 38.3 mg/ Kg [16.6] Ref. 13, pp. 1 7, 12 15, 20 Silver ND [4.0] Ref. 13, pp. 1 7, 12 15, 20 Vanadium 11.1L mg/ Kg [20.8] Ref. 13, pp. 1 7, 12 15, 20 Zinc 307 mg/ Kg [8.3] Ref. 13, pp. 1 7, 12 15, 20 Cyanide ND [2.1] Ref. 13, pp. 1 7, 12 15, 20 SE 05 FGW49 Volatiles Carbon Disulfide NDM [250] Ref. 15, pp. 1 9, 23 30, 49 Cyclohexane ND [110] Ref. 15, pp. 1 9, 23 30, 49 Benzene 68Jv µg/ Kg [110] Ref. 15, pp. 1 9, 23 30, 49 Methylcyclohexane 98Jv µg/ Kg [110] Ref. 15, pp. 1 9, 23 30, 49 Toluene 21Jv µg/ Kg [110] Ref. 15, pp. 1 9, 23 30, 49 Chlorobenzene 200Jv µg/ Kg [110] Ref. 15, pp. 1 9, 23 30, 50 Ethylbenzene 30Jv µg/ Kg [110] Ref. 15, pp. 1 9, 23 30, 50 Xylenes (total) 110Jv µg/ Kg [110] Ref. 15, pp. 1 9, 23 30, 50 Isopropylbenzene 180Jv µg/ Kg [110] Ref. 15, pp. 1 9, 23 30, 50 1,3 Dichlorobenzene 1,300 µg/ Kg [110] Ref. 15, pp. 1 9, 23 30, 50 1,4 Dichlorobenzene 320Jv µg/ Kg [110] Ref. 15, pp. 1 9, 23 30, 50 SE 05 FGW49 Semivolatiles Hexachlorobutadiene 19,000 µg/ Kg [15,000] Ref. 15, pp. 1 9, 23 30, 103 2 Methylnaphthalene 1,600LJ µg/ Kg [15,000] Ref. 15, pp. 1 9, 23 30, 103 Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 30 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou SE 05 FGW49 Semivolatiles Hexachlorobenzene 4,800J µg/ Kg [15,000] Ref. 15, pp. 1 9, 23 30, 104 SE 05 FGW49 Pesticides/ PCBs Aldrin NDM [210] Ref. 15, pp. 1 9, 23 30, 147 Endosulfan I 3.3J µg/ Kg [3.9] Ref. 15, pp. 1 9, 23 30, 147 Endrin ND [75] Ref. 15, pp. 1 9, 23 30, 147 Aroclor 1248 4,500 µg/ Kg [75] Ref. 15, pp. 1 9, 23 30, 147 Aroclor 1254 ND [750] Ref. 15, pp. 1 9, 23 30, 147 Aroclor 1260 180J* µg/ Kg [75] Ref. 15, pp. 1 9, 23 30, 147 ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is an estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this sample. J^ indicates a high bias and Jv indicates a low bias. IDL = Instrument detection limit. L = Reported concentration is between the IDL and CRDL. CRDL = Contract required detection limit. M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N = Identification is tentative. T = Identification is questionable because of absence of other commonly coexisting pesticides. Shaded samples = The sample met observed release criteria for that hazardous substance. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 31 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 06 MFHW70 Inorganics Cadmium 0.96L mg/ Kg [2.2] Ref. 13, pp. 1 7, 12 15, 21 Chromium 164 mg/ Kg [4.4] Ref. 13, pp. 1 7, 12 15, 21 Copper 86.2 mg/ Kg [10.8] Ref. 13, pp. 1 7, 12 15, 21 Lead 95.6 mg/ Kg [1.3] Ref. 13, pp. 1 7, 12 15, 21 Manganese 160 mg/ Kg [6.5] Ref. 13, pp. 1 7, 12 15, 21 Mercury 22.68J* mg/ Kg [0.22] Ref. 13, pp. 1 7, 12 15, 21 Nickel 43.6 mg/ Kg [17.3] Ref. 13, pp. 1 7, 12 15, 21 Silver ND [4.4] Ref. 13, pp. 1 7, 12 15, 21 Vanadium 13.7L mg/ Kg [21.6] Ref. 13, pp. 1 7, 12 15, 21 Zinc 322 mg/ Kg [8.7] Ref. 13, pp. 1 7, 12 15, 21 Cyanide ND [2.2] Ref. 13, pp. 1 7, 12 15, 21 SE 06 FGW50 Volatiles Carbon Disulfide NDMJ [180] Ref. 15, pp. 1 9, 23 30, 52 Cyclohexane ND [100] Ref. 15, pp. 1 9, 23 30, 52 Benzene 147.2J^* µg/ Kg [100] Ref. 15, pp. 1 9, 23 30, 52 Methylcyclohexane 340J^ µg/ Kg [100] Ref. 15, pp. 1 9, 23 30, 52 Toluene 92J^* µg/ Kg [100] Ref. 15, pp. 1 9, 23 30, 52 Chlorobenzene 335J^* µg/ Kg [100] Ref. 15, pp. 1 9, 23 30, 53 Ethylbenzene 15J^* µg/ Kg [100] Ref. 15, pp. 1 9, 23 30, 53 Xylenes (total) 78J^* µg/ Kg [100] Ref. 15, pp. 1 9, 23 30, 53 Isopropylbenzene 680J^ µg/ Kg [100] Ref. 15, pp. 1 9, 23 30, 53 1,3 Dichlorobenzene 1,700 µg/ Kg [1,000] Ref. 15, pp. 1 9, 23 30, 53 1,4 Dichlorobenzene 820J^ µg/ Kg [110] Ref. 15, pp. 1 9, 23 30, 53 Table 6 (Continued) Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 32 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou SE 06 FGW50 Semivolatiles Hexachlorobutadiene 21,000 µg/ Kg [14,000] Ref. 15, pp. 1 9, 23 30, 106 2 Methylnaphthalene 1,800J µg/ Kg [14,000] Ref. 15, pp. 1 9, 23 30, 106 Hexachlorobenzene 4,800J µg/ Kg [14,000] Ref. 15, pp. 1 9, 23 30, 107 SE 06 FGW50 Pesticides/ PCBs Aldrin NDMJ [170] Ref. 15, pp. 1 9, 23 30, 149 50 Endosulfan I ND [35] Ref. 15, pp. 1 9, 23 30, 149 50 Endrin ND [69] Ref. 15, pp. 1 9, 23 30, 149 50 Aroclor 1248 380J* µg/ Kg [69] Ref. 15, pp. 1 9, 23 30, 149 50 Aroclor 1254 ND [690] Ref. 15, pp. 1 9, 23 30, 149 50 Aroclor 1260 210J* µg/ Kg [69] Ref. 15, pp. 1 9, 23 30, 149 50 ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is an estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this sample. J^ indicates a high bias and Jv indicates a low bias. IDL = Instrument detection limit. L = Reported concentration is between the IDL and CRDL. CRDL = Contract required detection limit. M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N = Identification is tentative. T = Identification is questionable because of absence of other commonly coexisting pesticides. Shaded samples = The sample met observed release criteria for that hazardous substance. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 33 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 07 MFHW71 Inorganics Cadmium 0.43L mg/ Kg [1.4] Ref. 13, pp. 1 7, 12 15, 22 Chromium 48.8 mg/ Kg [2.8] Ref. 13, pp. 1 7, 12 15, 22 Copper 25.2 mg/ Kg [7.0] Ref. 13, pp. 1 7, 12 15, 22 Lead 47.1 mg/ Kg [0.84] Ref. 13, pp. 1 7, 12 15, 22 Manganese 92.6 mg/ Kg [4.2] Ref. 13, pp. 1 7, 12 15, 22 Mercury 1.42J* mg/ Kg [0.14] Ref. 13, pp. 1 7, 12 15, 22 Nickel 29.2 mg/ Kg [11.2] Ref. 13, pp. 1 7, 12 15, 22 Silver ND [2.8] Ref. 13, pp. 1 7, 12 15, 22 Vanadium 9.7L mg/ Kg [14.0] Ref. 13, pp. 1 7, 12 15, 22 Zinc 123 mg/ Kg [5.6] Ref. 13, pp. 1 7, 12 15, 22 Cyanide 1.1 mg/ Kg [1.4] Ref. 13, pp. 1 7, 12 15, 22 SE 07 FGW51 Volatiles Carbon Disulfide NDMJ [80] Ref. 15, pp. 1 9, 23 30, 58 Cyclohexane ND [72] Ref. 15, pp. 1 9, 23 30, 58 Benzene 150 µg/ Kg [72] Ref. 15, pp. 1 9, 23 30, 58 Methylcyclohexane 9J µg/ Kg [72] Ref. 15, pp. 1 9, 23 30, 58 Toluene 22J µg/ Kg [72] Ref. 15, pp. 1 9, 23 30, 58 Chlorobenzene 550J^* µg/ Kg [720] Ref. 15, pp. 1 9, 23 30, 59 Ethylbenzene 7J µg/ Kg [72] Ref. 15, pp. 1 9, 23 30, 59 Xylenes (total) 34J µg/ Kg [72] Ref. 15, pp. 1 9, 23 30, 59 Isopropylbenzene 16J µg/ Kg [72] Ref. 15, pp. 1 9, 23 30, 59 1,3 Dichlorobenzene 1,700 µg/ Kg [720] Ref. 15, pp. 1 9, 23 30, 59 1,4 Dichlorobenzene 1,400 µg/ Kg [72] Ref. 15, pp. 1 9, 23 30, 59 Table 6 (Continued) Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 34 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou SE 07 FGW51 Semivolatiles Hexachlorobutadiene 71,000 µg/ Kg [19,000] Ref. 15, pp. 1 9, 23 30, 109 2 Methylnaphthalene 450LJ µg/ Kg [1,900] Ref. 15, pp. 1 9, 23 30, 109 Hexachlorobenzene 40,000 µg/ Kg [19,000] Ref. 15, pp. 1 9, 23 30, 110 SE 07 FGW51 Pesticides/ PCBs Aldrin ND [2.5] Ref. 15, pp. 1 9, 23 30, 151 Endosulfan I ND [2.5] Ref. 15, pp. 1 9, 23 30, 151 Endrin ND [4.8] Ref. 15, pp. 1 9, 23 30, 151 Aroclor 1248 ND [48] Ref. 15, pp. 1 9, 23 30, 151 Aroclor 1254 32J* µg/ Kg [48] Ref. 15, pp. 1 9, 23 30, 151 Aroclor 1260 ND [48] Ref. 15, pp. 1 9, 23 30, 151 ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is an estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this sample. J^ indicates a high bias and Jv indicates a low bias. IDL = Instrument detection limit. L = Reported concentration is between the IDL and CRDL. CRDL = Contract required detection limit. M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N = Identification is tentative. T = Identification is questionable because of absence of other commonly coexisting pesticides. Shaded samples = The sample met observed release criteria for that hazardous substance. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 35 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 08 MFHW72 Inorganics Cadmium 0.50L mg/ Kg [1.5] Ref. 13, pp. 1 7, 12 15, 23 Chromium 56.5 mg/ Kg [3.0] Ref. 13, pp. 1 7, 12 15, 23 Copper 30.7 mg/ Kg [7.5] Ref. 13, pp. 1 7, 12 15, 23 Lead 54.3 mg/ Kg [0.9] Ref. 13, pp. 1 7, 12 15, 23 Manganese 107 mg/ Kg [4.5] Ref. 13, pp. 1 7, 12 15, 23 Mercury 1.58J* mg/ Kg [0.15] Ref. 13, pp. 1 7, 12 15, 23 Nickel 31.7 mg/ Kg [12.0] Ref. 13, pp. 1 7, 12 15, 23 Silver ND [3.0] Ref. 13, pp. 1 7, 12 15, 23 Vanadium 11.5L mg/ Kg [15.0] Ref. 13, pp. 1 7, 12 15, 23 Zinc 159 mg/ Kg [6.0] Ref. 13, pp. 1 7, 12 15, 23 Cyanide ND [1.5] Ref. 13, pp. 1 7, 12 15, 23 SE 08 FGW52 Volatiles Carbon Disulfide NDMJ [120] Ref. 15, pp. 1 9, 23 30, 61 Cyclohexane ND [75] Ref. 15, pp. 1 9, 23 30, 61 Benzene 48J µg/ Kg [75] Ref. 15, pp. 1 9, 23 30, 61 Methylcyclohexane ND [75] Ref. 15, pp. 1 9, 23 30, 61 Toluene 14J µg/ Kg [75] Ref. 15, pp. 1 9, 23 30, 61 Chlorobenzene 780 µg/ Kg [75] Ref. 15, pp. 1 9, 23 30, 62 Ethylbenzene ND [75] Ref. 15, pp. 1 9, 23 30, 62 Xylenes (total) 19J µg/ Kg [75] Ref. 15, pp. 1 9, 23 30, 62 Isopropylbenzene 17J µg/ Kg [75] Ref. 15, pp. 1 9, 23 30, 62 1,3 Dichlorobenzene 1,100 µg/ Kg [75] Ref. 15, pp. 1 9, 23 30, 62 1,4 Dichlorobenzene 460 µg/ Kg [75] Ref. 15, pp. 1 9, 23 30, 62 Table 6 (Continued) Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 36 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou SE 08 FGW52 Semivolatiles Hexachlorobutadiene 95,000 µg/ Kg [25,000] Ref. 15, pp. 1 9, 23 30, 115 2 Methylnaphthalene ND [25,000] Ref. 15, pp. 1 9, 23 30, 115 Hexachlorobenzene 38,000 µg/ Kg [25,000] Ref. 15, pp. 1 9, 23 30, 116 SE 08 FGW52 Pesticides/ PCBs Aldrin 1.12J* µg/ Kg [2.5] Ref. 15, pp. 1 9, 23 30, 152 Endosulfan I ND [2.5] Ref. 15, pp. 1 9, 23 30, 152 Endrin ND [4.9] Ref. 15, pp. 1 9, 23 30, 152 Aroclor 1248 ND [49] Ref. 15, pp. 1 9, 23 30, 152 Aroclor 1254 37J* µg/ Kg [49] Ref. 15, pp. 1 9, 23 30, 152 Aroclor 1260 ND [49] Ref. 15, pp. 1 9, 23 30, 152 ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is an estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this sample. J^ indicates a high bias and Jv indicates a low bias. IDL = Instrument detection limit. L = Reported concentration is between the IDL and CRDL. CRDL = Contract required detection limit. M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N = Identification is tentative. T = Identification is questionable because of absence of other commonly coexisting pesticides. Shaded samples = The sample met observed release criteria for that hazardous substance. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 37 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 09 MFHW73 Inorganics Cadmium 0.37L mg/ Kg [1.5] Ref. 13, pp. 1 7, 12 15, 24 Chromium 42.5 mg/ Kg [3.0] Ref. 13, pp. 1 7, 12 15, 24 Copper 26.4 mg/ Kg [7.7] Ref. 13, pp. 1 7, 12 15, 24 Lead 28.7 mg/ Kg [0.92] Ref. 13, pp. 1 7, 12 15, 24 Manganese 89.2 mg/ Kg [4.6] Ref. 13, pp. 1 7, 12 15, 24 Mercury 1.75J* mg/ Kg [0.15] Ref. 13, pp. 1 7, 12 15, 24 Nickel 25.5 mg/ Kg [12.3] Ref. 13, pp. 1 7, 12 15, 24 Silver ND [3.0] Ref. 13, pp. 1 7, 12 15, 24 Vanadium 8.1L mg/ Kg [15.4] Ref. 13, pp. 1 7, 12 15, 24 Zinc 116 mg/ Kg [6.2] Ref. 13, pp. 1 7, 12 15, 24 Cyanide 1.5 mg/ Kg [1.5] Ref. 13, pp. 1 7, 12 15, 24 SE 09 FGW53 Volatiles Carbon Disulfide NDMJ [130] Ref. 15, pp. 1 9, 23 30, 64 Cyclohexane ND [78] Ref. 15, pp. 1 9, 23 30, 64 Benzene 30J µg/ Kg [78] Ref. 15, pp. 1 9, 23 30, 64 Methylcyclohexane ND [78] Ref. 15, pp. 1 9, 23 30, 64 Toluene 11J µg/ Kg [78] Ref. 15, pp. 1 9, 23 30, 64 Chlorobenzene 480 µg/ Kg [78] Ref. 15, pp. 1 9, 23 30, 65 Ethylbenzene ND [78] Ref. 15, pp. 1 9, 23 30, 65 Xylenes (total) 12J µg/ Kg [78] Ref. 15, pp. 1 9, 23 30, 65 Isopropylbenzene 11J µg/ Kg [78] Ref. 15, pp. 1 9, 23 30, 65 1,3 Dichlorobenzene 770 µg/ Kg [78] Ref. 15, pp. 1 9, 23 30, 65 1,4 Dichlorobenzene 310 µg/ Kg [78] Ref. 15, pp. 1 9, 23 30, 65 Table 6 (Continued) Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 38 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou SE 09 FGW53 Semivolatiles Hexachlorobutadiene 75,000 µg/ Kg [26,000] Ref. 15, pp. 1 9, 23 30, 118 2 Methylnaphthalene ND [26,000] Ref. 15, pp. 1 9, 23 30, 118 Hexachlorobenzene 32,000 µg/ Kg [26,000] Ref. 15, pp. 1 9, 23 30, 119 SE 09 FGW53 Pesticides/ PCBs Aldrin 1.12J* µg/ Kg [2.7] Ref. 15, pp. 1 9, 23 30, 153 Endosulfan I ND [2.7] Ref. 15, pp. 1 9, 23 30, 153 Endrin ND [5.2] Ref. 15, pp. 1 9, 23 30, 153 Aroclor 1248 ND [52] Ref. 15, pp. 1 9, 23 30, 153 Aroclor 1254 530 µg/ Kg [52] Ref. 15, pp. 1 9, 23 30, 153 Aroclor 1260 ND [52] Ref. 15, pp. 1 9, 23 30, 153 ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is an estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this sample. J^ indicates a high bias and Jv indicates a low bias. IDL = Instrument detection limit. L = Reported concentration is between the IDL and CRDL. CRDL = Contract required detection limit. M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N = Identification is tentative. T = Identification is questionable because of absence of other commonly coexisting pesticides. Shaded samples = The sample met observed release criteria for that hazardous substance. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 39 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 14 MFHW78 Inorganics Cadmium 0.83L mg/ Kg [63.7] Ref. 12, pp. 1 7, 10 13, 15 Chromium 56 mg/ Kg [3.4] Ref. 12, pp. 1 7, 10 13, 15 Copper 60.2 mg/ Kg [8.4] Ref. 12, pp. 1 7, 10 13, 15 Lead 32.6 mg/ Kg [1.01] Ref. 12, pp. 1 7, 10 13, 15 Manganese 223 mg/ Kg [5.1] Ref. 12, pp. 1 7, 10 13, 15 Mercury 0.45 mg/ Kg [0.17] Ref. 12, pp. 1 7, 10 13, 15 Nickel 20.9 mg/ Kg [13.5] Ref. 12, pp. 1 7, 10 13, 15 Silver ND [3.4] Ref. 12, pp. 1 7, 10 13, 15 Vanadium 25.7 mg/ Kg [16.8] Ref. 12, pp. 1 7, 10 13, 15 Zinc 174 mg/ Kg [6.7] Ref. 12, pp. 1 7, 10 13, 15 Cyanide 0.43LJv mg/ Kg [1.7] Ref. 12, pp. 1 7, 10 13, 15 SE 14 FGW58 Volatiles Carbon Disulfide NDMJ [32] Ref. 14, pp. 1 13, 26 34, 38 Cyclohexane ND [16] Ref. 14, pp. 1 13, 26 34, 38 Benzene ND [16] Ref. 14, pp. 1 13, 26 34, 38 Methylcyclohexane ND [16] Ref. 14, pp. 1 13, 26 34, 38 Toluene ND [16] Ref. 14, pp. 1 13, 26 34, 38 Chlorobenzene ND [16] Ref. 14, pp. 1 13, 26 34, 39 Ethylbenzene ND [16] Ref. 14, pp. 1 13, 26 34, 39 Xylenes (total) 5LJ µg/ Kg [16] Ref. 14, pp. 1 13, 26 34, 39 Isopropylbenzene 19 µg/ Kg [16] Ref. 14, pp. 1 13, 26 34, 39 1,3 Dichlorobenzene 3LJ µg/ Kg [16] Ref. 14, pp. 1 13, 26 34, 39 1,4 Dichlorobenzene ND [16] Ref. 14, pp. 1 13, 26 34, 39 Table 6 (Continued) Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 40 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 14 FGW58 Semivolatiles Hexachlorobutadiene ND [530] Ref. 14, pp. 1 13, 26 34, 83 2 Methylnaphthalene ND [530] Ref. 14, pp. 1 13, 26 34, 83 Hexachlorobenzene ND [530] Ref. 14, pp. 1 13, 26 34, 84 SE 14 FGW58 Pesticides/ PCBs Aldrin NDMJ [6.5] Ref. 14, pp. 1 13, 26 34, 129 Endosulfan I ND [2.7] Ref. 14, pp. 1 13, 26 34, 129 Endrin 1.9LJ µg/ Kg [5.3] Ref. 14, pp. 1 13, 26 34, 129 Aroclor 1248 16J* µg/ Kg [53] Ref. 14, pp. 1 13, 26 34, 129 Aroclor 1254 ND [53] Ref. 14, pp. 1 13, 26 34, 129 Aroclor 1260 ND [53] Ref. 14, pp. 1 13, 26 34, 129 ND = Not detected. ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is an estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this sample. J^ indicates a high bias and Jv indicates a low bias. IDL = Instrument detection limit. L = Reported concentration is between the IDL and CRDL. CRDL = Contract required detection limit. M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N = Identification is tentative. T = Identification is questionable because of absence of other commonly coexisting pesticides. Shaded samples = The sample met observed release criteria for that hazardous substance. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 41 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 17 MFHW81 Inorganics Cadmium 1.1 mg/ Kg [1.4] Ref. 12, pp. 1 7, 10 13, 18 Chromium 280 mg/ Kg [2.8] Ref. 12, pp. 1 7, 10 13, 18 Copper 31.7 mg/ Kg [6.9] Ref. 12, pp. 1 7, 10 13, 18 Lead 34.5 mg/ Kg [0.8] Ref. 12, pp. 1 7, 10 13, 18 Manganese 3,500 mg/ Kg [4.2] Ref. 12, pp. 1 7, 10 13, 18 Mercury 0.17 mg/ Kg [0.14] Ref. 12, pp. 1 7, 10 13, 18 Nickel 14.1 mg/ Kg [11.1] Ref. 12, pp. 1 7, 10 13, 18 Silver ND [2.8] Ref. 12, pp. 1 7, 10 13, 18 Vanadium 87.7 mg/ Kg [13.9] Ref. 12, pp. 1 7, 10 13, 18 Zinc 225 mg/ Kg [5.6] Ref. 12, pp. 1 7, 10 13, 18 Cyanide 0.26LJv mg/ Kg [1.4] Ref. 12, pp. 1 7, 10 13, 18 SE 17 FGW61 Volatiles Carbon Disulfide NDJ [15] Ref. 14, pp. 1 13, 26 34, 47 Cyclohexane ND [13] Ref. 14, pp. 1 13, 26 34, 47 Benzene 4J µg/ Kg [13] Ref. 14, pp. 1 13, 26 34, 47 Methylcyclohexane ND [13] Ref. 14, pp. 1 13, 26 34, 47 Toluene 4J µg/ Kg [13] Ref. 14, pp. 1 13, 26 34, 47 Chlorobenzene 1J µg/ Kg [13] Ref. 14, pp. 1 13, 26 34, 48 Ethylbenzene ND [13] Ref. 14, pp. 1 13, 26 34, 48 Xylenes (total) 2J µg/ Kg [13] Ref. 14, pp. 1 13, 26 34, 48 Isopropylbenzene 6J µg/ Kg [13] Ref. 14, pp. 1 13, 26 34, 48 1,3 Dichlorobenzene ND [13] Ref. 14, pp. 1 13, 26 34, 48 1,4 Dichlorobenzene ND [13] Ref. 14, pp. 1 13, 26 34, 48 Table 6 (Continued) Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 42 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou SE 17 FGW61 Semivolatiles Hexachlorobutadiene ND [860] Ref. 14, pp. 1 13, 26 34, 95 2 Methylnaphthalene ND [860] Ref. 14, pp. 1 13, 26 34, 95 Hexachlorobenzene ND [860] Ref. 14, pp. 1 13, 26 34, 96 SE 17 FGW61 Pesticides/ PCBs Aldrin ND [2.2] Ref. 14, pp. 1 13, 26 34, 132 Endosulfan I ND [2.2] Ref. 14, pp. 1 13, 26 34, 132 Endrin ND [4.3] Ref. 14, pp. 1 13, 26 34, 132 Aroclor 1248 ND [43] Ref. 14, pp. 1 13, 26 34, 132 Aroclor 1254 ND [43] Ref. 14, pp. 1 13, 26 34, 132 Aroclor 1260 ND [43] Ref. 14, pp. 1 13, 26 34, 132 ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is an estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this sample. J^ indicates a high bias and Jv indicates a low bias. IDL = Instrument detection limit. L = Reported concentration is between the IDL and CRDL. CRDL = Contract required detection limit. M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N = Identification is tentative. T = Identification is questionable because of absence of other commonly coexisting pesticides. Shaded samples = The sample met observed release criteria for that hazardous substance. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 43 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 18 MFHW82 Inorganics Cadmium 0.44 mg/ Kg [1.5] Ref. 12, pp. 1 7, 10 13, 19 Chromium 96.5 mg/ Kg [2.9] Ref. 12, pp. 1 7, 10 13, 19 Copper 23.7 mg/ Kg [7.3] Ref. 12, pp. 1 7, 10 13, 19 Lead 33.4 mg/ Kg [0.9] Ref. 12, pp. 1 7, 10 13, 19 Manganese 411 mg/ Kg [4.4] Ref. 12, pp. 1 7, 10 13, 19 Mercury 0.47 mg/ Kg [0.14] Ref. 12, pp. 1 7, 10 13, 19 Nickel 18.3 mg/ Kg [11.7] Ref. 12, pp. 1 7, 10 13, 19 Silver ND [2.9] Ref. 12, pp. 1 7, 10 13, 19 Vanadium 18.6 mg/ Kg [14.7] Ref. 12, pp. 1 7, 10 13, 19 Zinc 201mg/ Kg [5.9] Ref. 12, pp. 1 7, 10 13, 19 Cyanide NDJv [1.5] Ref. 12, pp. 1 7, 10 13, 19 SE 18 FGW62 Volatiles Carbon Disulfide 7.4J* µg/ Kg [74] Ref. 14, pp. 1 13, 26 34, 50 Cyclohexane ND [74] Ref. 14, pp. 1 13, 26 34, 50 Benzene 55J µg/ Kg [74] Ref. 14, pp. 1 13, 26 34, 50 Methylcyclohexane 80 µg/ Kg [74] Ref. 14, pp. 1 13, 26 34, 50 Toluene ND [74] Ref. 14, pp. 1 13, 26 34, 50 Chlorobenzene ND [74] Ref. 14, pp. 1 13, 26 34, 51 Ethylbenzene 10J µg/ Kg [74] Ref. 14, pp. 1 13, 26 34, 51 Xylenes (total) 44J µg/ Kg [74] Ref. 14, pp. 1 13, 26 34, 51 Isopropylbenzene 2,200 µg/ Kg [74] Ref. 14, pp. 1 13, 26 34, 51 1,3 Dichlorobenzene ND [74] Ref. 14, pp. 1 13, 26 34, 51 1,4 Dichlorobenzene ND [74] Ref. 14, pp. 1 13, 26 34, 51 Table 6 (Continued) Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 44 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou SE 18 FGW62 Semivolatiles Hexachlorobutadiene ND [970] Ref. 14, pp. 1 13, 26 34, 98 2 Methylnaphthalene 390J µg/ Kg [970] Ref. 14, pp. 1 13, 26 34, 98 Hexachlorobenzene ND [970] Ref. 14, pp. 1 13, 26 34, 99 SE 18 FGW62 Pesticides/ PCBs Aldrin NDMJ [260] Ref. 14, pp. 1 13, 26 34, 133 Endosulfan I 2.7J* µg/ Kg [2.5] Ref. 14, pp. 1 13, 26 34, 133 Endrin 48 µg/ Kg [4.9] Ref. 14, pp. 1 13, 26 34, 133 Aroclor 1248 330J* µg/ Kg [49] Ref. 14, pp. 1 13, 26 34, 133 Aroclor 1254 ND [49] Ref. 14, pp. 1 13, 26 34, 133 Aroclor 1260 29J* µg/ Kg [49] Ref. 14, pp. 1 13, 26 34, 133 ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is an estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this sample. J^ indicates a high bias and Jv indicates a low bias. IDL = Instrument detection limit. L = Reported concentration is between the IDL and CRDL. CRDL = Contract required detection limit. M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N = Identification is tentative. T = Identification is questionable because of absence of other commonly coexisting pesticides. Shaded samples = The sample met observed release criteria for that hazardous substance. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 45 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 19 MFHW83 Inorganics Cadmium 0.64 mg/ Kg [1.8] Ref. 12, pp. 1 7, 10 13, 20 Chromium 78.5 mg/ Kg [3.6] Ref. 12, pp. 1 7, 10 13, 20 Copper 43.7 mg/ Kg [8.9] Ref. 12, pp. 1 7, 10 13, 20 Lead 37.3 mg/ Kg [1.1] Ref. 12, pp. 1 7, 10 13, 20 Manganese 162 mg/ Kg [5.3] Ref. 12, pp. 1 7, 10 13, 20 Mercury 0.59 mg/ Kg [0.18] Ref. 12, pp. 1 7, 10 13, 20 Nickel 20.4 mg/ Kg [14.2] Ref. 12, pp. 1 7, 10 13, 20 Silver 0.73 mg/ Kg [3.6] Ref. 12, pp. 1 7, 10 13, 20 Vanadium 17.3 mg/ Kg [17.8] Ref. 12, pp. 1 7, 10 13, 20 Zinc 269 mg/ Kg [7.1] Ref. 12, pp. 1 7, 10 13, 20 Cyanide 0.75LJv mg/ Kg [1.8] Ref. 12, pp. 1 7, 10 13, 20 SE 19 FGW63 Volatiles Carbon Disulfide NDJ [58] Ref. 14, pp. 1 13, 26 34, 56 Cyclohexane 4J µg/ Kg [17] Ref. 14, pp. 1 13, 26 34, 56 Benzene 7J µg/ Kg [17] Ref. 14, pp. 1 13, 26 34, 56 Methylcyclohexane 6J µg/ Kg [17] Ref. 14, pp. 1 13, 26 34, 56 Toluene ND [17] Ref. 14, pp. 1 13, 26 34, 56 Chlorobenzene ND [17] Ref. 14, pp. 1 13, 26 34, 57 Ethylbenzene ND [17] Ref. 14, pp. 1 13, 26 34, 57 Xylenes (total) 48 µg/ Kg [17] Ref. 14, pp. 1 13, 26 34, 57 Isopropylbenzene 100 µg/ Kg [17] Ref. 14, pp. 1 13, 26 34, 57 1,3 Dichlorobenzene 3J µg/ Kg [17] Ref. 14, pp. 1 13, 26 34, 57 1,4 Dichlorobenzene ND [17] Ref. 14, pp. 1 13, 26 34, 57 Table 6 (Continued) Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 46 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou SE 19 FGW63 Semivolatiles Hexachlorobutadiene ND [11,000] Ref. 14, pp. 1 13, 26 34, 101 2 Methylnaphthalene 28,000 µg/ Kg [11,000] Ref. 14, pp. 1 13, 26 34, 101 Hexachlorobenzene NDJv [11,000] Ref. 14, pp. 1 13, 26 34, 102 SE 19 FGW63 Pesticides/ PCBs Aldrin NDM [290] Ref. 14, pp. 1 13, 26 34, 135 Endosulfan I 0.99J* µg/ Kg [2.9] Ref. 14, pp. 1 13, 26 34, 135 Endrin 1.8J* µg/ Kg [5.6] Ref. 14, pp. 1 13, 26 34, 135 Aroclor 1248 460J* µg/ Kg [56] Ref. 14, pp. 1 13, 26 34, 135 Aroclor 1254 ND [56] Ref. 14, pp. 1 13, 26 34, 135 Aroclor 1260 250 µg/ Kg [56] Ref. 14, pp. 1 13, 26 34, 135 ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is an estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this sample. J^ indicates a high bias and Jv indicates a low bias. IDL = Instrument detection limit. L = Reported concentration is between the IDL and CRDL. CRDL = Contract required detection limit. M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N = Identification is tentative. T = Identification is questionable because of absence of other commonly coexisting pesticides. Shaded samples = The sample met observed release criteria for that hazardous substance. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 47 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 20 MFHW84 Inorganics Cadmium 1.7 mg/ Kg [3.5] Ref. 13, pp. 1 7, 12 15, 29 Chromium 497 mg/ Kg [6.9] Ref. 13, pp. 1 7, 12 15, 29 Copper 122 mg/ Kg [17.2] Ref. 13, pp. 1 7, 12 15, 29 Lead 101 mg/ Kg [2.1] Ref. 13, pp. 1 7, 12 15, 29 Manganese 155 mg/ Kg [10.3] Ref. 13, pp. 1 7, 12 15, 29 Mercury 15.74J* mg/ Kg [0.34] Ref. 13, pp. 1 7, 12 15, 29 Nickel 47.4 mg/ Kg [27.6] Ref. 13, pp. 1 7, 12 15, 29 Silver 1.7 mg/ Kg [6.9] Ref. 13, pp. 1 7, 12 15, 29 Vanadium 23.1 mg/ Kg [34.5 Ref. 13, pp. 1 7, 12 15, 29 Zinc 818 mg/ Kg [13.8] Ref. 13, pp. 1 7, 12 15, 29 Cyanide ND [3.5] Ref. 13, pp. 1 7, 12 15, 29 SE 20 FGW64 Volatiles Carbon Disulfide 420 µg/ Kg [38] Ref. 15, pp. 1 9, 23 30, 79 Cyclohexane 390J^ µg/ Kg [38] Ref. 15, pp. 1 9, 23 30, 79 Benzene 182.7J^* µg/ Kg [38] Ref. 15, pp. 1 9, 23 30, 79 Methylcyclohexane 540 µg/ Kg [38] Ref. 15, pp. 1 9, 23 30, 79 Toluene 36.8J^* µg/ Kg [38] Ref. 15, pp. 1 9, 23 30, 79 Chlorobenzene 49 µg/ Kg [38] Ref. 15, pp. 1 9, 23 30, 80 Ethylbenzene 49J^* µg/ Kg [38] Ref. 15, pp. 1 9, 23 30, 80 Xylenes (total) 140J^* µg/ Kg [38] Ref. 15, pp. 1 9, 23 30, 80 Isopropylbenzene 2,800 µg/ Kg [190] Ref. 15, pp. 1 9, 23 30, 80 1,3 Dichlorobenzene 320 µg/ Kg [38] Ref. 15, pp. 1 9, 23 30, 80 1,4 Dichlorobenzene 85 µg/ Kg [38] Ref. 15, pp. 1 9, 23 30, 80 Table 6 (Continued) Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 48 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou SE 20 FGW64 Semivolatiles Hexachlorobutadiene 430J µg/ Kg [5,100] Ref. 15, pp. 1 9, 23 30, 133 2 Methylnaphthalene 880J µg/ Kg [5,100] Ref. 15, pp. 1 9, 23 30, 133 Hexachlorobenzene 270J µg/ Kg [5,100] Ref. 15, pp. 1 9, 23 30, 134 SE 20 FGW64 Pesticides/ PCBs Aldrin 230 µg/ Kg [65] Ref. 15, pp. 1 9, 23 30, 159 Endosulfan I 0.78J* µg/ Kg [6.5] Ref. 15, pp. 1 9, 23 30, 159 Endrin 72 µg/ Kg [13] Ref. 15, pp. 1 9, 23 30, 159 Aroclor 1248 4,300 µg/ Kg [130] Ref. 15, pp. 1 9, 23 30, 159 Aroclor 1254 ND [130] Ref. 15, pp. 1 9, 23 30, 159 Aroclor 1260 160J* µg/ Kg [130] Ref. 15, pp. 1 9, 23 30, 159 ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is an estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this sample. J^ indicates a high bias and Jv indicates a low bias. IDL = Instrument detection limit. L = Reported concentration is between the IDL and CRDL. CRDL = Contract required detection limit. M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N = Identification is tentative. T = Identification is questionable because of absence of other commonly coexisting pesticides. Shaded samples = The sample met observed release criteria for that hazardous substance. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 49 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 21 MFHW85 Inorganics Cadmium 1.4 mg/ Kg [3.2] Ref. 13, pp. 1 7, 12 15, 30 Chromium 394 mg/ Kg [6.4] Ref. 13, pp. 1 7, 12 15, 30 Copper 99.3 mg/ Kg [15.9] Ref. 13, pp. 1 7, 12 15, 30 Lead 84.9 mg/ Kg [1.9] Ref. 13, pp. 1 7, 12 15, 30 Manganese 124 mg/ Kg [9.6] Ref. 13, pp. 1 7, 12 15, 30 Mercury 7.65J* mg/ Kg [0.32] Ref. 13, pp. 1 7, 12 15, 30 Nickel 41.1 mg/ Kg [25.5] Ref. 13, pp. 1 7, 12 15, 30 Silver 1.5 mg/ Kg [6.4] Ref. 13, pp. 1 7, 12 15, 30 Vanadium 18.0 mg/ Kg [31.9] Ref. 13, pp. 1 7, 12 15, 30 Zinc 673 mg/ Kg [12.7] Ref. 13, pp. 1 7, 12 15, 30 Cyanide ND [3.5] Ref. 13, pp. 1 7, 12 15, 30 SE 21 FGW65 Volatiles Carbon Disulfide ND [330] Ref. 15, pp. 1 9, 23 30, 85 Cyclohexane NDJv [160] Ref. 15, pp. 1 9, 23 30, 85 Benzene 90Jv µg/ Kg [160] Ref. 15, pp. 1 9, 23 30, 85 Methylcyclohexane 300 µg/ Kg [160] Ref. 15, pp. 1 9, 23 30, 85 Toluene 19Jv µg/ Kg [160] Ref. 15, pp. 1 9, 23 30, 85 Chlorobenzene 24Jv µg/ Kg [160] Ref. 15, pp. 1 9, 23 30, 86 Ethylbenzene 53Jv µg/ Kg [160] Ref. 15, pp. 1 9, 23 30, 86 Xylenes (total) 610 Jv µg/ Kg [160] Ref. 15, pp. 1 9, 23 30, 86 Isopropylbenzene 1,900 µg/ Kg [160] Ref. 15, pp. 1 9, 23 30, 86 1,3 Dichlorobenzene 200 µg/ Kg [160] Ref. 15, pp. 1 9, 23 30, 86 1,4 Dichlorobenzene 55J µg/ Kg [160] Ref. 15, pp. 1 9, 23 30, 86 Table 6 (Continued) Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 50 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou SE 21 FGW65 Semivolatiles Hexachlorobutadiene 290J µg/ Kg [4,400] Ref. 15, pp. 1 9, 23 30, 136 2 Methylnaphthalene 450J µg/ Kg [4,400] Ref. 15, pp. 1 9, 23 30, 136 Hexachlorobenzene 300J µg/ Kg [4,400] Ref. 15, pp. 1 9, 23 30, 137 SE 21 FGW65 Pesticides/ PCBs Aldrin 170 µg/ Kg [57] Ref. 15, pp. 1 9, 23 30, 161 Endosulfan I 1.4J* µg/ Kg [5.7] Ref. 15, pp. 1 9, 23 30, 161 Endrin 66 µg/ Kg [11] Ref. 15, pp. 1 9, 23 30, 161 Aroclor 1248 3,400 µg/ Kg [5.7] Ref. 15, pp. 1 9, 23 30, 161 Aroclor 1254 ND [110] Ref. 15, pp. 1 9, 23 30, 161 Aroclor 1260 1,100 µg/ Kg [110] Ref. 15, pp. 1 9, 23 30, 161 ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is an estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this sample. J^ indicates a high bias and Jv indicates a low bias. IDL = Instrument detection limit. L = Reported concentration is between the IDL and CRDL. CRDL = Contract required detection limit. M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N = Identification is tentative. T = Identification is questionable because of absence of other commonly coexisting pesticides. Shaded samples = The sample met observed release criteria for that hazardous substance. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 51 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 22 MFHW86 Inorganics Cadmium 0.76 mg/ Kg [2.2] Ref. 12, pp. 1 7, 10 13, 21 Chromium 188 mg/ Kg [4.5] Ref. 12, pp. 1 7, 10 13, 21 Copper 82.2 mg/ Kg [11.2] Ref. 12, pp. 1 7, 10 13, 21 Lead 151mg/ Kg [1.3] Ref. 12, pp. 1 7, 10 13, 21 Manganese 276 mg/ Kg [6.7] Ref. 12, pp. 1 7, 10 13, 21 Mercury 17.8 mg/ Kg [0.22] Ref. 12, pp. 1 7, 10 13, 21 Nickel 51 mg/ Kg [17.9] Ref. 12, pp. 1 7, 10 13, 21 Silver 62.8mg/ Kg [4.5] Ref. 12, pp. 1 7, 10 13, 21 Vanadium 10.2 mg/ Kg [22.3] Ref. 12, pp. 1 7, 10 13, 21 Zinc 337 mg/ Kg [8.9] Ref. 12, pp. 1 7, 10 13, 21 Cyanide 1.01LJv mg/ Kg [2.2] Ref. 12, pp. 1 7, 10 13, 21 SE 22 FGW66 Volatiles Carbon Disulfide 31.0J* µg/ Kg [110] Ref. 14, pp. 1 13, 26 34, 59 Cyclohexane ND [110] Ref. 14, pp. 1 13, 26 34, 59 Benzene 450 µg/ Kg [110] Ref. 14, pp. 1 13, 26 34, 59 Methylcyclohexane 390 µg/ Kg [110] Ref. 14, pp. 1 13, 26 34, 59 Toluene 950 µg/ Kg [110] Ref. 14, pp. 1 13, 26 34, 59 Chlorobenzene 72J µg/ Kg [110] Ref. 14, pp. 1 13, 26 34, 60 Ethylbenzene 360 µg/ Kg [110] Ref. 14, pp. 1 13, 26 34, 60 Xylenes (total) 1,400 µg/ Kg [110] Ref. 14, pp. 1 13, 26 34, 60 Isopropylbenzene 3,900 µg/ Kg [1,110] Ref. 14, pp. 1 13, 26 34, 60 1,3 Dichlorobenzene 1,300 µg/ Kg [110] Ref. 14, pp. 1 13, 26 34, 60 1,4 Dichlorobenzene 530 µg/ Kg [110] Ref. 14, pp. 1 13, 26 34, 60 Table 6 (Continued) Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 52 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou SE 22 FGW66 Semivolatiles Hexachlorobutadiene ND [25,000] Ref. 14, pp. 1 13, 26 34, 107 2 Methylnaphthalene 20,000J µg/ Kg [25,000] Ref. 14, pp. 1 13, 26 34, 107 Hexachlorobenzene ND [25,000] Ref. 14, pp. 1 13, 26 34, 108 SE 22 FGW66 Pesticides/ PCBs Aldrin NDM [390] Ref. 14, pp. 1 13, 26 34, 137 Endosulfan I 70JN µg/ Kg [4.2] Ref. 14, pp. 1 13, 26 34, 137 Endrin 150 µg/ Kg [8.2] Ref. 14, pp. 1 13, 26 34, 137 Aroclor 1248 14,000 µg/ Kg [820] Ref. 14, pp. 1 13, 26 34, 137 Aroclor 1254 ND [820] Ref. 14, pp. 1 13, 26 34, 137 Aroclor 1260 340J* µg/ Kg [82] Ref. 14, pp. 1 13, 26 34, 137 ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is an estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this sample. J^ indicates a high bias and Jv indicates a low bias. IDL = Instrument detection limit. L = Reported concentration is between the IDL and CRDL. CRDL = Contract required detection limit. M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N = Identification is tentative. T = Identification is questionable because of absence of other commonly coexisting pesticides. Shaded samples = The sample met observed release criteria for that hazardous substance. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 53 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 23 MFHW87 Inorganics Cadmium 1.8 mg/ Kg [1.6] Ref. 12, pp. 1 7, 10 13, 22 Chromium 77.5 mg/ Kg [3.3] Ref. 12, pp. 1 7, 10 13, 22 Copper 39.2 mg/ Kg [8.2] Ref. 12, pp. 1 7, 10 13, 22 Lead 77.7 mg/ Kg [0.98] Ref. 12, pp. 1 7, 10 13, 22 Manganese 179 mg/ Kg [4.9] Ref. 12, pp. 1 7, 10 13, 22 Mercury 6.5 mg/ Kg [0.16] Ref. 12, pp. 1 7, 10 13, 22 Nickel 35 mg/ Kg [13.1] Ref. 12, pp. 1 7, 10 13, 22 Silver ND [3.3] Ref. 12, pp. 1 7, 10 13, 22 Vanadium 24.7 mg/ Kg [16.4] Ref. 12, pp. 1 7, 10 13, 22 Zinc 483 mg/ Kg [6.6] Ref. 12, pp. 1 7, 10 13, 22 Cyanide 0.71LJv mg/ Kg [1.6] Ref. 12, pp. 1 7, 10 13, 22 SE 23 FGW67 Volatiles Carbon Disulfide NDJ [54] Ref. 14, pp. 1 13, 26 34, 65 Cyclohexane ND [18] Ref. 14, pp. 1 13, 26 34, 65 Benzene 3J µg/ Kg [18] Ref. 14, pp. 1 13, 26 34, 65 Methylcyclohexane 7J µg/ Kg [18] Ref. 14, pp. 1 13, 26 34, 65 Toluene 2J µg/ Kg [18] Ref. 14, pp. 1 13, 26 34, 65 Chlorobenzene 16J µg/ Kg [18] Ref. 14, pp. 1 13, 26 34, 66 Ethylbenzene 4J µg/ Kg [18] Ref. 14, pp. 1 13, 26 34, 66 Xylenes (total) 22 µg/ Kg [18] Ref. 14, pp. 1 13, 26 34, 66 Isopropylbenzene 26 µg/ Kg [18] Ref. 14, pp. 1 13, 26 34, 66 1,3 Dichlorobenzene 29 µg/ Kg [18] Ref. 14, pp. 1 13, 26 34, 66 1,4 Dichlorobenzene 5J µg/ Kg [18] Ref. 14, pp. 1 13, 26 34, 66 Table 6 (Continued) Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 54 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou SE 23 FGW67 Semivolatiles Hexachlorobutadiene ND [18,000] Ref. 14, pp. 1 13, 26 34, 110 2 Methylnaphthalene ND [18,000] Ref. 14, pp. 1 13, 26 34, 110 Hexachlorobenzene ND [18,000] Ref. 14, pp. 1 13, 26 34, 111 SE 23 FGW67 Pesticides/ PCBs Aldrin NDMJ [11,000] Ref. 14, pp. 1 13, 26 34, 139 Endosulfan I 270J µg/ Kg [310] Ref. 14, pp. 1 13, 26 34, 139 Endrin 1,000J µg/ Kg [600] Ref. 14, pp. 1 13, 26 34, 139 Aroclor 1248 300,000 µg/ Kg [60,000] Ref. 14, pp. 1 13, 26 34, 139 Aroclor 1254 ND [6,000] Ref. 14, pp. 1 13, 26 34, 139 Aroclor 1260 ND [6,000] Ref. 14, pp. 1 13, 26 34, 139 ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is an estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this sample. J^ indicates a high bias and Jv indicates a low bias. IDL = Instrument detection limit. L = Reported concentration is between the IDL and CRDL. CRDL = Contract required detection limit. M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N = Identification is tentative. T = Identification is questionable because of absence of other commonly coexisting pesticides. Shaded samples = The sample met observed release criteria for that hazardous substance. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 55 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 24 MFHW88 Inorganics Cadmium 1.4 mg/ Kg [2.2] Ref. 12, pp. 1 7, 10 13, 23 Chromium 229 mg/ Kg [4.4] Ref. 12, pp. 1 7, 10 13, 23 Copper 104 mg/ Kg [11.1] Ref. 12, pp. 1 7, 10 13, 23 Lead 139 mg/ Kg [1.3] Ref. 12, pp. 1 7, 10 13, 23 Manganese 221 mg/ Kg [6.7] Ref. 12, pp. 1 7, 10 13, 23 Mercury 37.1 mg/ Kg [0.22] Ref. 12, pp. 1 7, 10 13, 23 Nickel 70 mg/ Kg [17.8] Ref. 12, pp. 1 7, 10 13, 23 Silver 1.0 mg/ Kg [4.4] Ref. 12, pp. 1 7, 10 13, 23 Vanadium 18.0 mg/ Kg [22.2] Ref. 12, pp. 1 7, 10 13, 23 Zinc 450mg/ Kg [8.9] Ref. 12, pp. 1 7, 10 13, 23 Cyanide 0.40LJv mg/ Kg [2.2] Ref. 12, pp. 1 7, 10 13, 23 SE 24 FGW68 Volatiles Carbon Disulfide ND [1,100] Ref. 14, pp. 1 13, 26 34, 68 Cyclohexane ND [1,100] Ref. 14, pp. 1 13, 26 34, 68 Benzene 380J µg/ Kg [1,100] Ref. 14, pp. 1 13, 26 34, 68 Methylcyclohexane 620J µg/ Kg [1,100] Ref. 14, pp. 1 13, 26 34, 68 Toluene 660J µg/ Kg [1,100] Ref. 14, pp. 1 13, 26 34, 68 Chlorobenzene 2,200 µg/ Kg [1,100] Ref. 14, pp. 1 13, 26 34, 69 Ethylbenzene 650J µg/ Kg [1,100] Ref. 14, pp. 1 13, 26 34, 69 Xylenes (total) 3,500 µg/ Kg [1,100] Ref. 14, pp. 1 13, 26 34, 69 Isopropylbenzene 9,600 µg/ Kg [1,100] Ref. 14, pp. 1 13, 26 34, 69 1,3 Dichlorobenzene 33,000 µg/ Kg [2,100] Ref. 14, pp. 1 13, 26 34, 69 1,4 Dichlorobenzene 3,700 µg/ Kg [1,100] Ref. 14, pp. 1 13, 26 34, 69 Table 6 (Continued) Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 56 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou SE 24 FGW68 Semivolatiles Hexachlorobutadiene 7,700J µg/ Kg [21,000] Ref. 14, pp. 1 13, 26 34, 113 2 Methylnaphthalene 4,000J µg/ Kg [21,000] Ref. 14, pp. 1 13, 26 34, 113 Hexachlorobenzene 2,200J µg/ Kg [21,000] Ref. 14, pp. 1 13, 26 34, 114 SE 24 FGW68 Pesticides/ PCBs Aldrin NDMJ [420] Ref. 14, pp. 1 13, 26 34, 142 Endosulfan I ND [3.6] Ref. 14, pp. 1 13, 26 34, 142 Endrin ND [7.0] Ref. 14, pp. 1 13, 26 34, 142 Aroclor 1248 19,000 µg/ Kg [700] Ref. 14, pp. 1 13, 26 34, 142 Aroclor 1254 ND [70] Ref. 14, pp. 1 13, 26 34, 142 Aroclor 1260 ND [70] Ref. 14, pp. 1 13, 26 34, 142 ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is an estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this sample. J^ indicates a high bias and Jv indicates a low bias. IDL = Instrument detection limit. L = Reported concentration is between the IDL and CRDL. CRDL = Contract required detection limit. M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N = Identification is tentative. T = Identification is questionable because of absence of other commonly coexisting pesticides. Shaded samples = The sample met observed release criteria for that hazardous substance. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 57 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 25 MFHW89 Inorganics Cadmium 1.0 mg/ Kg [1.6] Ref. 12, pp. 1 7, 10 13, 24 Chromium 76.5 mg/ Kg [3.3] Ref. 12, pp. 1 7, 10 13, 24 Copper 89.3 mg/ Kg [8.2] Ref. 12, pp. 1 7, 10 13, 24 Lead 30.2 mg/ Kg [0.98] Ref. 12, pp. 1 7, 10 13, 24 Manganese 103 mg/ Kg [4.9] Ref. 12, pp. 1 7, 10 13, 24 Mercury 0.59 mg/ Kg [0.16] Ref. 12, pp. 1 7, 10 13, 24 Nickel 20.1 mg/ Kg [13.1] Ref. 12, pp. 1 7, 10 13, 24 Silver ND [3.3] Ref. 12, pp. 1 7, 10 13, 24 Vanadium 17.1 mg/ Kg [16.4] Ref. 12, pp. 1 7, 10 13, 24 Zinc 227 mg/ Kg [6.6] Ref. 12, pp. 1 7, 10 13, 24 Cyanide 0.34LJv mg/ Kg [1.6] Ref. 12, pp. 1 7, 10 13, 24 SE 25 FGW69 Volatiles Carbon Disulfide 63BJ µg/ Kg [16] Ref. 14, pp. 1 13, 26 34, 74 Cyclohexane 2J µg/ Kg [16] Ref. 14, pp. 1 13, 26 34, 74 Benzene 2J µg/ Kg [16] Ref. 14, pp. 1 13, 26 34, 74 Methylcyclohexane 3J µg/ Kg [16] Ref. 14, pp. 1 13, 26 34, 74 Toluene ND [16] Ref. 14, pp. 1 13, 26 34, 74 Chlorobenzene ND [16] Ref. 14, pp. 1 13, 26 34, 75 Ethylbenzene ND [16] Ref. 14, pp. 1 13, 26 34, 75 Xylenes (total) 46 µg/ Kg [16] Ref. 14, pp. 1 13, 26 34, 75 Isopropylbenzene 48 µg/ Kg [16] Ref. 14, pp. 1 13, 26 34, 75 1,3 Dichlorobenzene 5J µg/ Kg [16] Ref. 14, pp. 1 13, 26 34, 75 1,4 Dichlorobenzene 2J µg/ Kg [16] Ref. 14, pp. 1 13, 26 34, 75 Table 6 (Continued) Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 58 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou SE 25 FGW69 Semivolatiles Hexachlorobutadiene 35J µg/ Kg [520] Ref. 14, pp. 1 13, 26 34, 116 2 Methylnaphthalene 100J µg/ Kg [520] Ref. 14, pp. 1 13, 26 34, 116 Hexachlorobenzene ND [520] Ref. 14, pp. 1 13, 26 34, 117 SE 25 FGW69 Pesticides/ PCBs Aldrin NDM [110] Ref. 14, pp. 1 13, 26 34, 143 Endosulfan I 0.99J µg/ Kg [2.7] Ref. 14, pp. 1 13, 26 34, 143 Endrin 12 µg/ Kg [5.2] Ref. 14, pp. 1 13, 26 34, 143 Aroclor 1248 1,400 µg/ Kg [52] Ref. 14, pp. 1 13, 26 34, 143 Aroclor 1254 ND [52] Ref. 14, pp. 1 13, 26 34, 143 Aroclor 1260 ND [52] Ref. 14, pp. 1 13, 26 34, 143 ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is an estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this sample. J^ indicates a high bias and Jv indicates a low bias. IDL = Instrument detection limit. L = Reported concentration is between the IDL and CRDL. CRDL = Contract required detection limit. M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N = Identification is tentative. T = Identification is questionable because of absence of other commonly coexisting pesticides. Shaded samples = The sample met observed release criteria for that hazardous substance. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 59 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou Sample Location/ CLP ID Hazardous Substance Concentration [SQL] Reference SE 26 MFHW90 Inorganics Cadmium 0.89 mg/ Kg [1.7] Ref. 13, pp. 1 7, 12 15, 31 Chromium 84.4 mg/ Kg [3.4] Ref. 13, pp. 1 7, 12 15, 31 Copper 47.2 mg/ Kg [8.5] Ref. 13, pp. 1 7, 12 15, 31 Lead 49.8 mg/ Kg [1.0] Ref. 13, pp. 1 7, 12 15, 31 Manganese 111 mg/ Kg [5.1] Ref. 13, pp. 1 7, 12 15, 31 Mercury 2.84J* mg/ Kg [0.17] Ref. 13, pp. 1 7, 12 15, 31 Nickel 20.5 mg/ Kg [13.6] Ref. 13, pp. 1 7, 12 15, 31 Silver 0.41 mg/ Kg [3.4] Ref. 13, pp. 1 7, 12 15, 31 Vanadium 11.9 mg/ Kg [17.0] Ref. 13, pp. 1 7, 12 15, 31 Zinc 238 mg/ Kg [6.8] Ref. 13, pp. 1 7, 12 15, 31 Cyanide ND [1.7] Ref. 13, pp. 1 7, 12 15, 31 SE 26 FGW70 Volatiles Carbon Disulfide 220B µg/ Kg [88] Ref. 15, pp. 1 9, 23 30, 88 Cyclohexane ND [88] Ref. 15, pp. 1 9, 23 30, 88 Benzene 25J µg/ Kg [88] Ref. 15, pp. 1 9, 23 30, 88 Methylcyclohexane 69J µg/ Kg [88] Ref. 15, pp. 1 9, 23 30, 88 Toluene 38J µg/ Kg [88] Ref. 15, pp. 1 9, 23 30, 88 Chlorobenzene 1,700 µg/ Kg [88] Ref. 15, pp. 1 9, 23 30, 89 Ethylbenzene 21J µg/ Kg [88] Ref. 15, pp. 1 9, 23 30, 89 Xylenes (total) 91 µg/ Kg [88] Ref. 15, pp. 1 9, 23 30, 89 Isopropylbenzene 120 µg/ Kg [88] Ref. 15, pp. 1 9, 23 30, 89 1,3 Dichlorobenzene 500 µg/ Kg [88] Ref. 15, pp. 1 9, 23 30, 89 1,4 Dichlorobenzene 470 µg/ Kg [88] Ref. 15, pp. 1 9, 23 30, 89 Table 6 (Continued) Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 60 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)

Surface Water Pathway Contaminated Sediment Samples Collected from the Houston Ship Channel, East Fork Tributary and Patrick Bayou SE 26 FGW70 Semivolatiles Hexachlorobutadiene 30,000 µg/ Kg [12,000] Ref. 15, pp. 1 9, 23 30, 139 2 Methylnaphthalene ND [12,000] Ref. 15, pp. 1 9, 23 30, 139 Hexachlorobenzene 8,500J µg/ Kg [12,000] Ref. 15, pp. 1 9, 23 30, 140 SE 26 FGW70 Pesticides/ PCBs Aldrin ND [3.0] Ref. 15, pp. 1 9, 23 30, 163 Endosulfan I ND [3.0] Ref. 15, pp. 1 9, 23 30, 163 Endrin ND [5.8] Ref. 15, pp. 1 9, 23 30, 163 Aroclor 1248 ND [58] Ref. 15, pp. 1 9, 23 30, 163 Aroclor 1254 ND [58] Ref. 15, pp. 1 9, 23 30, 163 Aroclor 1260 ND [58] Ref. 15, pp. 1 9, 23 30, 163 ND = Not detected. Concentrations for these constituents were not detected at the reported quantitation limit in sediment samples. [SQL] = The sample quantitation limit. SQL for metals is mg/ Kg and the SQL for organics is µg/ Kg. SQL = (CRQL/ CRDL) x (df) / % solids, where % solids = [100  % moisture] / 100 J, J^, Jv = The value is an estimated concentration because one or more of the quality control criteria have not been met. It is included to show that the substance has been qualitatively identified as present in this sample. J^ indicates a high bias and Jv indicates a low bias. IDL = Instrument detection limit. L = Reported concentration is between the IDL and CRDL. CRDL = Contract required detection limit. M = Reported concentration should be used as a raised quantitation limit because of interferences and/ or laboratory contamination. N = Identification is tentative. T = Identification is questionable because of absence of other commonly coexisting pesticides. Shaded samples = The sample met observed release criteria for that hazardous substance. * = Adjusted result. See Data Usability Table 7. Draft HRS Documentation Record Patrick Bayou Site February 2001 TX0000605329 61 SWOF Surface Water Overland/ Flood Migration Pathway SWOF Observed Release TABLE 6 (Continued)