[Federal Register Volume 77, Number 27 (Thursday, February 9, 2012)]
[Proposed Rules]
[Pages 6692-6694]
[FR Doc No: 2012-3036]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2012-0110; Directorate Identifier 2011-NM-148-AD]
RIN 2120-AA64

Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: We propose to adopt a new airworthiness directive (AD) for
certain The Boeing Company Model 737-100, -200, -200C, -300, -400, and
-500 series airplanes equipped with analog transient suppression
devices (ATSDs) installed in accordance with Supplemental Type
Certificate number ST00146BO. This proposed AD was prompted by multiple
reports of corrosion on ATSDs. This proposed AD would require revising
the maintenance program to incorporate certain limitations. We are
proposing this AD to detect and correct corrosion on ATSDs, which could
result in the loss of high voltage transient protection (e.g.,
lightning protection) in the fuel tanks and consequent fuel tank
explosion and loss of the airplane.

DATES: We must receive comments on this proposed AD by March 26, 2012.

ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
     Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.
     Fax:<PHONE_NUMBER>.
     Mail: U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE., Washington, DC 20590.
     Hand Delivery: Deliver to Mail address above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    For service information identified in this proposed AD, contact
Goodrich Corporation, Sensors and Integrated Systems, 100 Panton Road,
Vergennes, Vermont 05491; phone:<PHONE_NUMBER>; fax:<PHONE_NUMBER>;
email<EMAIL_ADDRESS>Internet: http://www.goodrich.com. You
may review copies of the referenced service information at the FAA,
Transport Airplane Directorate, 1601 Lind Avenue SW., Renton,
Washington. For information on the availability of this material at the
FAA, call<PHONE_NUMBER>.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://www.regulations.gov; or in person at the Docket Management Facility
between 9 a.m. and 5 p.m., Monday through Friday, except Federal
holidays. The AD docket contains this proposed AD, the regulatory
evaluation, any comments received, and other information. The street
address for the Docket Office (phone:<PHONE_NUMBER>) is in the ADDRESSES
section. Comments will be available in the AD docket shortly after
receipt.

FOR FURTHER INFORMATION CONTACT: Marc Ronell, Aerospace Engineer,
Engine and Propeller Directorate, ANE-150, FAA, New England Aircraft
Certification Office (ACO), 12 New England Executive Park, Burlington,
Massachusetts 01803; phone:<PHONE_NUMBER>; fax:<PHONE_NUMBER>; email:
<EMAIL_ADDRESS>
SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to send any written relevant data, views, or
arguments about this proposal. Send your comments to an address listed
under the ADDRESSES section. Include ``Docket No. FAA-2012-0110;
Directorate Identifier 2011-NM-148-AD'' at the beginning of your
comments. We specifically invite comments on the overall regulatory,
economic, environmental, and energy aspects of this proposed AD. We
will consider all comments received by the closing date and may amend
this proposed AD because of those comments.
    We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We
will also post a report summarizing each substantive verbal contact we
receive about this proposed AD.

Discussion

    We have received at least six reports of corrosion on the housings
of ATSDs. This condition, if not corrected, could result in the loss of
high voltage transient protection (e.g., lightning protection) in the
fuel tanks and consequent fuel tank explosion and loss of the airplane.

Relevant Service Information

    We have reviewed Goodrich Principal Instructions for Continued
Airworthiness Manual for the Analog Transient Suppression Device
Installation Applicable to Boeing 737-100 through -500 Airplanes
Supplemental Type Certificate--ST00146BO, Document T3044-0010-0101,
Revision D, dated September 26, 2011, which describes various
limitations, including Critical Design Control Limitations (CDCCL),
inspections, and checks of the ATSD, ground straps, and safe-side
harness.

FAA's Determination

    We are proposing this AD because we evaluated all the relevant
information and determined the unsafe condition described previously is
likely to exist or develop in other products of the same type design.

Proposed AD Requirements

    This proposed AD would require accomplishing the actions specified
in the service information described previously.

Costs of Compliance

    We estimate that this proposed AD affects 384 airplanes of U.S.
registry.
    We estimate the following costs to comply with this proposed AD:

                                                 Estimated costs
----------------------------------------------------------------------------------------------------------------
                                                                                Cost on U.S.
              Action                    Labor cost           Parts cost      Cost per product      operators
----------------------------------------------------------------------------------------------------------------
Revise maintenance program.......  1 work-hour x $85                   $0                $85            $32,640
                                    per hour = $85.
----------------------------------------------------------------------------------------------------------------

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to
issue rules on aviation safety. Subtitle I, section 106, describes the
authority of the FAA Administrator. Subtitle VII: Aviation Programs,
describes in more detail the scope of the Agency's authority.
    We are issuing this rulemaking under the authority described in
Subtitle VII, Part A, Subpart III, Section 44701: ``General
requirements.'' Under that section, Congress charges the FAA with
promoting safe flight of civil aircraft in air commerce by prescribing
regulations for practices, methods, and procedures the Administrator
finds necessary for safety in air commerce. This regulation is within
the scope of that authority because it addresses an unsafe condition
that is likely to exist or develop on products identified in this
rulemaking action.

Regulatory Findings

    We determined that this proposed AD would not have federalism
implications under Executive Order 13132. This proposed AD would not
have a substantial direct effect on the States, on the relationship
between the national Government and the States, or on the distribution
of power and responsibilities among the various levels of government.
    For the reasons discussed above, I certify this proposed
regulation:
    (1) Is not a ``significant regulatory action'' under Executive
Order 12866,
    (2) Is not a ``significant rule'' under the DOT Regulatory Policies
and Procedures (44 FR 11034, February 26, 1979),
    (3) Will not affect intrastate aviation in Alaska, and
    (4) Will not have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.

The Proposed Amendment

    Accordingly, under the authority delegated to me by the
Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

    1. The authority citation for part 39 continues to read as follows:

    Authority:  49 U.S.C. 106(g), 40113, 44701.

Sec.  39.13  [Amended]

    2. The FAA amends Sec.  39.13 by adding the following new
airworthiness directive (AD):

The Boeing Company: Docket No. FAA-2012-0110; Directorate Identifier
2011-NM-148-AD.

(a) Comments Due Date

    We must receive comments by March 26, 2012.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to The Boeing Company Model 737-100, -200, -
200C, -300, -400, and -500 series airplanes, certificated in any
category, with an original airworthiness certificate or original
export certificate of airworthiness issued before September 26,
2011, equipped with analog transient suppression devices (ATSDs)
installed in accordance with Supplemental Type Certificate number
ST00146BO.

    Note 1 to paragraphs (c), (g), and (h):  This AD requires
revisions to certain operator maintenance documents to include new
actions (e.g., inspections and/or Critical Design Configuration
Control Limitations (CDCCLs). Compliance with these actions is
required by 14 CFR 91.403(c). For airplanes that have been
previously modified, altered, or repaired in the areas addressed by
these inspections, the operator may not be able to accomplish the
inspections described in the revisions. In this situation, to comply
with 14 CFR 91.403(c), the operator must request approval for an
alternative method of compliance (AMOC) according to paragraph (i)
of this AD. The request should include a description of changes to
the required actions that will ensure the continued operational
safety of the airplane.

(d) Subject

    Joint Aircraft System Component (JASC)/Air Transport Association
(ATA) of America Code 2841, Fuel Quantity Indicator.

(e) Unsafe Condition

    This AD was prompted by multiple reports of corrosion on ATSDs.
We are issuing this AD to detect and correct corrosion on ATSDs,
which could result in the loss of high voltage transient protection
(e.g., lightning protection) in the fuel tanks and consequent fuel
tank explosion and loss of the airplane.

(f) Compliance

    Comply with this AD within the compliance times specified,
unless already done.

(g) Maintenance Program Revision

    Within 3 months after the effective date of this AD, revise the
maintenance program to incorporate the limitations specified in
Goodrich Principal Instructions for Continued Airworthiness Manual
for the Analog Transient Suppression Device Installation Applicable
to Boeing 737-100 through -500 Airplanes Supplemental Type
Certificate--ST00146BO, Document T3044-0010-0101, Revision D, dated
September 26, 2011. The initial compliance time for accomplishing
each task is at the applicable time specified in Goodrich Principal
Instructions for Continued Airworthiness Manual for the Analog
Transient Suppression Device Installation Applicable to Boeing 737-
100 through -500 Airplanes Supplemental Type Certificate--ST00146BO,
Document T3044-0010-0101, Revision D, dated September 26, 2011, or
within 18 months after the effective date of this AD, whichever
occurs later.

    Note 2 to paragraph (g): Components that have been identified as
airworthy or installed on the affected airplanes before the revision
of the maintenance program, as required by paragraph (g) of this AD,
do not need to be reworked in accordance with the CDCCLs. However,
once the maintenance program has been revised, paragraph (g) of this
AD requires that future maintenance actions on these components must
follow the CDCCLs.

(h) No Alternative Actions Intervals, and/or Critical Design
Configuration Control Limitations

    After accomplishing the revision required by paragraph (g) of
this AD, no alternative actions (e.g., inspections), intervals, and/
or CDCCLs may be used other than those specified in Goodrich
Principal Instructions for Continued Airworthiness Manual for the
Analog Transient Suppression Device Installation Applicable to
Boeing 737-100 through -500 Airplanes Supplemental Type
Certificate--ST00146BO, Document T3044-0010-0101, Revision D, dated
September 26, 2011, unless the actions, intervals, and/or CDCCLs are
approved as an AMOC in accordance with the procedures specified in
paragraph (i) of this AD.

(i) Alternative Methods of Compliance

    (1) The Manager, Boston Aircraft Certification Office (ACO),
FAA, has the authority to approve AMOCs for this AD, if requested
using the procedures found in 14 CFR 39.19. In accordance with 14
CFR 39.19,

send your request to your principal inspector or local Flight
Standards District Office, as appropriate. If sending information
directly to the manager of the ACO, send it to the attention of the
person identified in the Related Information section of this AD.
    (2) Before using any approved AMOC, notify your appropriate
principal inspector, or lacking a principal inspector, the manager
of the local flight standards district office/certificate holding
district office.

(j) Related Information

    (1) For more information about this AD, contact Marc Ronell,
Aerospace Engineer, Engine and Propeller Directorate, ANE-150, FAA,
New England Aircraft Certification Office (ACO), 12 New England
Executive Park, Burlington, Massachusetts 01803; phone: 781-238-
7776; fax:<PHONE_NUMBER>; email<EMAIL_ADDRESS>    (2) For service information identified in this AD, contact
Goodrich Corporation, Sensors and Integrated Systems, 100 Panton
Road, Vergennes, Vermont 05491; phone:<PHONE_NUMBER>; fax: 802-877-
4444; email<EMAIL_ADDRESS>Internet: http://www.goodrich.com/TechPubs. You may review copies of the referenced
service information at the FAA, Transport Airplane Directorate, 1601
Lind Avenue SW., Renton, Washington. For information on the
availability of this material at the FAA, call<PHONE_NUMBER>.

    Issued in Renton, Washington, on January 23, 2012.
Kalene C. Yanamura,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 2012-3036 Filed 2-8-12; 8:45 am]
BILLING CODE 4910-13-P


and death occur. Competent medical help must be obtained. Signs and
symptoms are:

F (oral)

Lack of or reduced perspiration

Nausea

Headache, dizziness, and confusion

Strong, rapid pulse

Coma

Treatment:  Remove worker to cool area, saturate clothes with cold
water, wrap worker in wet cold sheets (if possible), monitor ABC
(airway, breathing, circulation), treat for shock, and call emergency
services for basic life support (BLS) or advanced life support (ALS).

Heat Stress Monitoring

	A worker who exhibits any of the above symptoms will be immediately
relieved of responsibilities and requested to consume electrolyte fluid
or cool water while resting in a shaded area. The individual should not
return to work until symptoms are no longer recognizable. If symptoms
appear critical, persist, or get worse, the crew chief will seek
immediate medical attention for the employee. If the individual does
resume work, he/she will be monitored for any increase in heart rate for
the remainder of their shift. In addition, the worker will be requested
to consume electrolyte fluid or cool water every hour.

	The crew chief will visually monitor workers hourly when:

Symptoms of heat stress are reported or observed;

F and workers are dressed in impervious clothing; or

Ambient temperatures exceed 90F and workers are dressed in normal
clothing.

	For sampling on this project, work periods will be considered to be
approximately two hours in length.

	At ambient temperatures of 87F and above, workers will be monitored
for heat stress conditions by measuring the heart rate (HR) by radial
(wrist) pulse for 30 seconds after one minute of rest. The HR after one
minute of rest should not exceed 110 beats per minute. If higher, the
next work period shall be shortened by 33 percent, while the length of
rest period remains the same. If the pulse rate is still 110 beats per
minute after one minute of rest in the next rest period, the following
work cycle will be shortened by another 33 percent. This shortening of
the work period must continue until the worker's HR is no greater than
110 beats per minute.

First Aid

	  SEQ CHAPTER \h \r 1 First aid procedures in response to chemical
exposures will be conducted in accordance with the appropriate MSDS for
the chemical involved. If an incident occurs and MSDSs are not available
for a particular hazardous chemical (e.g., wastewater), the following
general first aid procedures will be performed:

Skin Contact - The affected area will be rinsed thoroughly and copiously
with clean water. Seek medical attention if irritation is experienced
after cleaning.

Eye Contact - The eyes will be flushed thoroughly at the nearest eyewash
station for 15 minutes. Follow up with medical attention.

Ingestion - The hospital will be notified and any procedures recommended
will be carried out.

	The first aid kit will be maintained on each site in the equipment
staging area. The contents of the first aid kit include at a minimum:

Adhesive bandages;

Antiseptic wipes;

A compress;

An eyewash solution;

Gauze pads;

A cold pack; and

A triangular bandage.

	The injuries most likely to be encountered at Belews Creek are cuts and
bruises; the first aid kit will be maintained and stocked accordingly.

Sample Preservation and Safety Considerations

	  SEQ CHAPTER \h \r 1 Water samples to be analyzed for various
contaminants may be preserved with sulfuric acid (H2SO4), hydrochloric
acid (HCl), sodium hydroxide (NaOH), or an ammonium sulfate buffer
solution (NH4SO4) before shipment to the analytical laboratory. Nitrile
gloves and splash goggles must be worn when handling these corrosive
chemicals to prevent chemical burns. Sample preservation must be
performed in a well-ventilated area (preferably an operational lab hood)
to avoid potential accumulation and inhalation of any toxic vapors. When
pouring samples, skin protection must also be worn (long-sleeved cotton
coveralls or uncoated Tyvek®, safety glasses with side shields or
splash goggles, and nitrile gloves).

	In some instances, the use of these preservation chemicals could create
a chemical reaction (i.e., generation of heat or release of toxic
vapors). For instance, if acids are added to a wastewater sample
containing cyanide or sulfides, dangerous and toxic vapors will be
emitted. If the sample reacts violently, notify the crew chief and stop
preserving the sample immediately.

	In the case of a chemical spill, the following procedures must be
followed:

Don protective clothing (nitrile gloves as a minimum).

Ventilate area (open doors, windows, or turn on ventilation).

Use spill control pillows or prepared neutralizers to contain/clean up
spill. Do not add water to acid.

Place spilled material in a heavy plastic container, label the
container, and contact site for disposal information.

Notify crew chief of the spill and the procedures used.

	At any time, if personnel do not feel comfortable about cleaning up the
spilled material or if a large quantity has been spilled, notify site
personnel. The site may have an emergency response team who will respond
to the chemical spill.

	In the case of fire, notify the site contact. If the fire can be easily
extinguished using a portable fire extinguisher, and personnel have
received fire extinguisher training, extinguish the fire using the
portable extinguisher.

Training and Medical Monitoring Requirements

	  SEQ CHAPTER \h \r 1 All ERG sampling crew personnel have participated
in ERG's annual 8-hour health and safety training program as specified
by ERG's Corporate Health and Safety Policy.

This training includes:

Toxicology;

Exposure limits;

Chemical, biological, and physical hazards;

Heat and cold stress;

Confined spaces;

PPE;

Decontamination; and

Emergency plans and procedures.

	All ERG personnel involved with sample collection and preservation are
active participants in the Medical Monitoring Program. Field sampling
personnel have received a baseline medical information review and
undergo a clinical assessment every one to two years.

Shift Work Protocol

	  SEQ CHAPTER \h \r 1 This section provides guidance for field
personnel project schedules and field work, particularly overtime. It is
important to remember extended work schedules will contribute to poor
production and motivation. All field teams will rotate to ensure that
sampling team members receive sufficient rest to avoid injuries
resulting from fatigue or inattention.

	It is common practice to perform 12-hour work days under project
management direction. If this work schedule is exceeded the following
guidelines will be recognized:

1A 15-hour maximum work day, provided that it does not occur on
consecutive days, or more than three times in ANY SEVEN-DAY PERIOD.

2Each shift should be followed by nine hours off per 24-hour period,
excluding driving time to and from the hotel.

No more than seven consecutive days of work allowed without a minimum of
24 hours off.

Each work day will be reviewed as a 24-hour cycle to assure all field
workers receive adequate time off.Table 6-1. Sample-Point-Specific
Personal Protective Equipment and Potential Hazards

Sampling Point Number	Sampling Point Description	Personal Protective
Equipment Required a	Potential Physical Hazards b

SP-1	Influent to FGD Wastewater Treatment System	Steel-toed boots, hard
hats, gloves and safety glasses.	Splash hazard: Potential for splashing
from the sample tap. Sample tap will be below waist level.

SP-2	Influent to Bioreactor System	Steel-toed boots, hard hats, gloves,
and safety glasses.	Splash hazard: Potential for splashing from the
sample tap. Sample tap will be below waist level.

SP-3/SP-4	Effluent from Bioreactor System	Steel-toed boots, hard hats,
gloves, and safety glasses.	Splash hazard: Potential for splashing from
the sample tap. Sample tap will be below waist level.

a – Splash protection (face shield) required if sampling port is waist
high or above. Hearing protection (ear plugs) will be worn if needed.

b – Additional physical hazards, if any, will be identified during the
formal on-site health and safety briefing. Updates to this table will be
made as needed.

References

  SEQ CHAPTER \h \r 1 U.S. Environmental Protection Agency, 2006.
Interim Detailed Study Report for the Steam Electric Power Generating
Point Source Category, EPA/821-R-06-015, November.

Eastern Research Group, Inc., 2007. Quality Assurance Project Plan for
the 2007 Steam Electric Detailed Study – Revision 1. September.

Eastern Research Group, Inc., 2007. Generic Sampling and Analysis Plan
for Coal-Fired Steam Electric Power Plants. May.

Appendix A

LIST OF METALS CONSTITUENTS FOR ANALYSIS  SEQ CHAPTER \h \r 1 Table A-1

List of Constituents for Analysis -

200.7/245.1/245.5 Metal Analytes

CAS

Number	Common Name	Technique	Method

7429905	ALUMINUM	ICP	200.7

7440360	ANTIMONY	ICP	200.7

7440382	ARSENIC	ICP	200.7

7440393	BARIUM	ICP	200.7

7440417	BERYLLIUM	ICP	200.7

7440428	BORON	ICP	200.7

7440439	CADMIUM	ICP	200.7

7440702	CALCIUM	ICP	200.7

7440473	CHROMIUM	ICP	200.7

7440484	COBALT	ICP	200.7

7440508	COPPER	ICP	200.7

7439896	IRON	ICP	200.7

7439921	LEAD	ICP	200.7

7439954	MAGNESIUM	ICP	200.7

7439965	MANGANESE	ICP	200.7

7439976 	MERCURY	CVAA	245.1, 245.5

7439987	MOLYBDENUM	ICP	200.7

7440020	NICKEL	ICP	200.7

7782492	SELENIUM	ICP	200.7

7440224	SILVER	ICP	200.7

7440235	SODIUM	ICP	200.7

7440280	THALLIUM	ICP	200.7

7440315	TIN	ICP	200.7

7440326	TITANIUM	ICP	200.7

7440622	VANADIUM	ICP	200.7

7440655	YTTRIUM	ICP	200.7

7440666	ZINC	ICP	200.7

27 METALS ANALYTES

  SEQ CHAPTER \h \r 1 Table A-2

List of Constituents for Analysis -

200.8 Metal Analytes

CAS

Number	Common Name
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7440473	CHROMIUM	ICP/MS	200.8

7440484	COBALT	ICP/MS	200.8

7440508	COPPER	ICP/MS	200.8

7439896	IRON	ICP/MS	200.8

7439921	LEAD	ICP/MS	200.8

7439954	MAGNESIUM	ICP/MS	200.8

7439965	MANGANESE	ICP/MS	200.8

7439987	MOLYBDENUM	ICP/MS	200.8

7440020	NICKEL	ICP/MS	200.8

7782492	SELENIUM	ICP/MS	200.8

7440224	SILVER	ICP/MS	200.8

7440235	SODIUM	ICP/MS	200.8

7440280	THALLIUM	ICP/MS	200.8

7440315	TIN	ICP/MS	200.8

7440326	TITANIUM	ICP/MS	200.8

7440622	VANADIUM	ICP/MS	200.8

7440666	ZINC	ICP/MS	200.8

25 METALS ANALYTES

Table A-3

List of Constituents for Analysis -

Low-Level Metal Analytes

CAS

Number	Common Name 	Technique	Method

7440360	ANTIMONY	ICP/MS	1638

7440382	ARSENIC	ICP/MS	1638

7440439	CADMIUM	ICP/MS	1638

7440473	CHROMIUM	ICP/MS	1638

7440473	CHROMIUM-HEXAVALENT	IC	1636

7440508	COPPER	ICP/MS	1638

7439921	LEAD	ICP/MS	1638

7439976 	MERCURY	OPT/CVAFS	1631

7440020	NICKEL	ICP/MS	1638

7782492	SELENIUM	ICP/MS	1638

7440224	SILVER	ICP/MS	1638

7440280	THALLIUM	ICP/MS	1638

7440666	ZINC	ICP/MS	1638

13 LOW-LEVEL METALS ANALYTES

 ERG will collect the low-level dissolved mercury sample using the same
technique as the low-level total mercury sample, but the dissolved
sample will be filtered at the laboratory. A low-level dissolved mercury
field blank will be performed by the laboratory to assess any mercury
contamination from the filtering performed at the laboratory. Therefore,
ERG does not need to collect a low-level dissolved mercury field blank
sample in the field. In addition, a routine total metals field blank
will be collected at the effluent from bioreactor system (SP-3) and not
from the influent to FGD wastewater treatment system (SP-1).

 ERG will collect the low-level dissolved mercury sample using the same
technique as the low-level total mercury sample, but the dissolved
sample will be filtered at the laboratory. A low-level dissolved mercury
field blank will be performed by the laboratory to assess any mercury
contamination from the filtering performed at the laboratory. Therefore,
ERG does not need to collect a low-level dissolved mercury field blank
sample in the field. In addition, a routine total metals field blank
will be collected at the effluent from the bioreactor system (SP-3) and
not from the influent to the bioreactor system (SP-2). ERG will use
blank water from the clean metals supplier for the routine total metals
field blank to prevent contamination so two different sets of sampling
equipment are not required.

 ERG will collect the low-level dissolved mercury sample using the same
technique as the low-level total mercury sample, but the dissolved
sample will be filtered at the laboratory. A low-level dissolved mercury
field blank will be performed by the laboratory to assess any mercury
contamination from the filtering performed at the laboratory. Therefore,
ERG does not need to collect a low-level dissolved mercury field blank
sample in the field.

 ERG will use blank water from the clean metals supplier for the routine
dissolved metals field blank and routine hexavalent chromium field blank
to prevent contamination so two different sets of sampling equipment are
not required.

 For routine total and dissolved metals, EPA is collecting field blanks
for each different type of sampling technique; therefore, only one field
blank is needed for the influent to the FGD wastewater treatment system,
the influent to the bioreactor system, and the effluent from the
bioreactor system because a similar technique is used to collect the
samples.

 PAGE

TABLE OF CONTENTS (Continued)

Page

 PAGE   ii

 PAGE   i

LIST OF TABLES (Continued)

 PAGE   iii

 PAGE   iii

LIST OF FIGURES (Continued)

 PAGE   2-6

 PAGE   iv

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 PAGE   3-30

 PAGE   3-32

 PAGE   6-9

 PAGE   7-1

A-  PAGE  2

A-  PAGE  1

Ash Pond

Wetland Supply Tank

002

5A

4A

3A

2A

1A

5B

4B

3B

2B

1B

EQ B

EQ A

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