GROUNDWATER MONITORING SYSTEM …AA3/...2017/10/17 · GROUNDWATER MONITORING SYSTEM CERTIFICATION...

GROUNDWATER MONITORING SYSTEM CERTIFICATION

U.S. EPA COAL COMBUSTION RESIDUAL RULE

DISPOSAL AREA NO. 3 MONTOUR STEAM ELECTRIC STATION

DERRY TOWNSHIP MONTOUR COUNTY, PENNSYLVANIA

Prepared For:

MONTOUR, LLC WASHINGTONVILLE, PENNSYLVANIA

Prepared By:

CIVIL & ENVIRONMENTAL CONSULTANTS, INC. PITTSBURGH, PENNSYLVANIA

CEC Project 132-065.1202

OCTOBER 2017

-i- Area 3, GMS Certification October 2017

TABLE OF CONTENTS

1.0 INTRODUCTION..............................................................................................................1 1.1 Purpose .................................................................................................................... 1

2.0 SITE OVERVIEW .............................................................................................................3 2.1 Background ............................................................................................................. 3 2.2 Geologic Setting...................................................................................................... 3 2.3 Hydrogeologic Setting ............................................................................................ 4

2.3.1 Conceptual Model ........................................................................................4 2.3.2 Hydrogeologic Characteristics .....................................................................4

3.0 GROUNDWATER MONITORING SYSTEM ...............................................................6 3.1 Monitoring Well Selection ...................................................................................... 6 3.2 Well Construction ................................................................................................... 7 3.3 Monitoring Well Development ............................................................................... 7

4.0 GROUNDWATER MONITORING CERTIFICATION ..............................................8

FIGURES

Figure 1 – Site Location Map – Area 3 Figure 2 –CCR Rule Groundwater Sampling Locations Figure 3 – Fourth Quarter 2015 Groundwater Contour Map

ATTACHMENTS

Attachment 1 – CCR Rule Boring Logs

-1- Area 3, GMS Certification October 2017

1.0 INTRODUCTION

1.1 PURPOSE

The United States Environmental Protection Agency (USEPA) issued 40 C.F.R. 257, Subpart D,

Disposal of Coal Combustion Residuals from Electric Utilities (CCR Rule) on April 17, 2015. The

CCR Rule regulates disposal of coal combustion residuals (CCR) in new and active landfills and

impoundments. CEC has prepared this report for Montour, LLC to meet the groundwater

monitoring system certification requirements for Disposal Area No. 3 at their Montour Steam

Electric Station, Derry Township, Montour County, Pennsylvania.

The CCR Rule states the following criteria for a groundwater monitoring system (40 C.F.R.

§257.91):

(a) Performance standard. The owner or operator of a CCR unit must install a groundwater

monitoring system that consists of a sufficient number of wells, installed at appropriate

locations and depths, to yield groundwater samples from the uppermost aquifer that:

(1) Accurately represent the quality of background groundwater that has not been

affected by leakage from a CCR unit. A determination of background quality may

include sampling of wells that are not hydraulically upgradient of the CCR

management area where:

(i) Hydrogeologic conditions do not allow the owner or operator of the CCR

unit to determine what wells are hydraulically upgradient; or

(ii) Sampling at other wells will provide an indication of background

groundwater quality that is as representative or more representative than

that provided by the upgradient wells; and

(2) Accurately represent the quality of groundwater passing the waste boundary of

the CCR unit. The downgradient monitoring system must be installed at the waste

boundary that ensures detection of groundwater contamination in the uppermost

aquifer. All potential contaminant must be monitored.

(b) The number, spacing, and depths of monitoring systems shall be determined based upon

site-specific technical information that must include thorough characterization of:


(1) Aquifer thickness, groundwater flow rate, groundwater flow direction including

seasonal and temporal fluctuations in groundwater flow; and

(2) Saturated and unsaturated geologic units and fill materials overlying the

uppermost aquifer, materials comprising the uppermost aquifer, and materials

comprising the confining unit defining the lower boundary of the uppermost

aquifer, including, but not limited to, thicknesses, stratigraphy, lithology, hydraulic

conductivities, porosities and effective porosities.

(c) The groundwater monitoring system must include the minimum number of monitoring

wells necessary to meet the performance standards specified in paragraph (a) of this

section, based on the site-specific information specified in paragraph (b) of this section.

The groundwater monitoring system must contain:

(1) A minimum of one upgradient and three downgradient monitoring wells; and

(2) Additional monitoring wells as necessary to accurately represent the quality of

background groundwater that has not been affected by leakage from the CCR unit

and the quality of groundwater passing the waste boundary of the CCR unit.

The CCR Rule also outlines well installation, development, sampling, and decommissioning

requirements. The CCR Rule requires the owner or operator to obtain a certification from a

qualified professional engineer stating that the groundwater monitoring system has been designed

and constructed as outlined above. A record of the certification must be placed in the facility’s

operating record and the publicly accessible internet site and the state must be notified that the

information is available.


2.0 SITE OVERVIEW

2.1 BACKGROUND

Disposal Area No. 3 (Area 3), located south of the main generation station (Figure 1), is a residual

waste landfill constructed and operated under Residual Waste Permit #300987 issued by the

Pennsylvania Department of Environmental Protection. The landfill is used for the disposal of

plant-generated residual waste, including scrubber wastewater treatment plant sludge (sludge is a

mixture of calcium sulfate solids and precipitated heavy metals), fly ash, mill rejects, and various

sump sludges. The disposal area also receives resins, filter bags and construction and demolition

wastes. The existing disposal area was constructed beginning in September 1987 and completed

in March 1990.

Area 3 consists of a western half and an eastern half. Only the eastern half has been constructed to

date. It is unlikely that the western half will ever be constructed. The eastern half is constructed

with a geomembrane liner and leachate collection system. Leachate from the eastern half is drained

through a piping network above the liner that directs the leachate into a leachate collection basin

located southeast of Area 3. The leachate collection basin is also lined with a geomembrane liner

and covered with onsite low permeability silt-clay soils.

Groundwater quality is monitored at Area 3 in accordance with the approved permit. Monitoring

points associated with the solid waste permit include: underdrains, monitoring wells, and surface

water locations. Wells associated with the permit are sampled quarterly. Results are summarized

in a Form 14R quarterly report submitted to the state.

2.2 GEOLOGIC SETTING

The site is situated on the northern limb of a regional anticline. The shallowest bedrock formation

underlying Area 3 is the Devonian Age Marcellus Shale. The Marcellus Shale has an approximate

orientation of N45°W with a dip to the northeast of 5 to 8°. The competent shale bedrock is overlain

by weathered bedrock that ranges in thickness from less than 1 foot to 10 feet. The weathered

bedrock is overlain by glacial till material consisting of silt, clay, and broken rock fragments.


2.3 HYDROGEOLOGIC SETTING

2.3.1 Conceptual Model

Topographically, the site lies within a regional basin with the highland ridges consisting of the

more resistant rock formations of an anticline. There is potential for an upward hydraulic gradient

in the general area of the site. The water table is within 10 feet of the ground surface.

The water-bearing zone directly below the site is unconfined. The overburden and the bedrock

zones are hydraulically well connected. Groundwater monitoring wells in the area typically have

screen intervals that intercept both the overburden material and the underlying bedrock.

A small tributary of Mud Creek separates the two halves of Area 3. This southeastward-flowing

tributary is redirected into two subsurface 48-inch diameter pipe conduits installed within Area 3.

The flow enters piping on the northwestern side of Area 3 and exits the piping at the southeastern

side of Area 3 (Figure 2).

The groundwater underlying Area 3 is shallow (less than 10 feet below the ground surface) and

occurs within bedrock or at the bedrock/overburden interface. Groundwater underdrains were

installed under Area 3, below the geomembrane liner, to drain the groundwater during seasonal

high levels and maintain the regulatory 8 feet separation. The groundwater underdrains are

separate from the 48-inch diameter conduits, however both systems discharge into same area,

southeast of Area 3 (see Figure 2). Figure 3 provides an approximation of the groundwater

elevation contours that currently exist under Area 3. The general groundwater flow direction is to

the south.

2.3.2 Hydrogeologic Characteristics

Hydraulic gradients calculated from 2015 water levels range from 0.003 to 0.008, with an overall

average of 0.006. Hydraulic conductivity values for the site have been obtained from site specific


data collected as part of previous site evaluations. Hydraulic conductivities in soil range between

1.7xl0-6 cm/sec and 1.8xl0-8 cm/sec. Highly weathered fractured shale ranged from 2.2xl0-2 cm/sec

to 5.0xl0-3 cm/sec. Fractured competent bedrock range from 3.0xl0-3 cm/sec to l.0xl0-4 cm/sec.

Competent shale with very little to no fracturing ranged from 1.7x10-6 cm/sec to 5.0xl0-7 cm/sec.


3.0 GROUNDWATER MONITORING SYSTEM

3.1 MONITORING WELL SELECTION

The groundwater monitoring system consists of a sufficient number of wells at appropriate

locations and depths to provide groundwater samples from the uppermost aquifer that accurately

represent background groundwater quality and the quality of groundwater passing the waste

boundary of the CCR unit.

There are numerous monitoring wells around Area 3 that were installed for the Pennsylvania

Residual Waste Permit and for past investigations. The CCR Rule Groundwater Monitoring

System consists of one existing well (PZ3-31) that was used in a previous investigation, and five

new wells installed to meet the requirements of the CCR Rule. The well locations are shown on

Figure 2. Table 1 summarizes the wells included as the CCR Rule Groundwater Monitoring

System to meet the CCR Rule groundwater monitoring performance standard.

TABLE 1. CCR RULE GROUNDWATER MONITORING SYSTEM

Location Relative Location

Well Diameter

(in.)

Bottom of Screen (ft-

bgs)

Screen Length (ft)

PZ3-31 Downgradient 2 17.7 9.5 MW-3-100 Downgradient 4 15 10 MW-3-101 Downgradient 4 15 10 MW-3-102 Downgradient 4 17 10 MW-3-103 Upgradient 4 15 10 MW-3-104 Upgradient 4 14 10

Based on existing groundwater contours, locations MW-3-103 and MW-3-104 will provide

upgradient water quality for groundwater flowing toward Area 3. The remaining wells, PZ3-31,

MW-3-100, MW-3-101, and MW-3-102, will provide downgradient groundwater quality.


3.2 WELL CONSTRUCTION

The Area 3 monitoring wells were vertically placed to monitor the uppermost aquifer. Borings

were advanced through the overburden and weathered bedrock using hollow-stem augers. Each

monitoring well is constructed of two or four-inch diameter schedule 40 PVC casing with

approximately 10 feet of well screen and solid riser extended to a height of approximately 2.5 feet

above the ground surface. The annulus is filled with clean quartz sand to approximately 2 feet

above the screen. Wells installed in response to the CCR Rule (MW-3-100, MW-3-101, MW-3-

102, MW-3-103, and MW-3-104) contain a U-Pack screen, used in an effort to reduce turbidity.

U-Pack screens, manufactured by Campbell Monoflex, are double-walled screens that enable the

installation of the filter media (silica sand) along the length of the screen prior to lowering it into

the borehole. This eliminates installing filter sand through turbid water, which entrains sediment

in the filter pack. The remaining annulus above the filter pack is filled with hydrated bentonite.

Each well is completed with a locking steel protective cover and concrete pad. The protective

cover is marked with the well identification number. Each well is locked and durable well signs

are installed at each well location. Boring logs are provided in Attachment 1.

3.3 MONITORING WELL DEVELOPMENT

Following installation, each monitoring well was developed by surging, bailing, and/or

overpumping. Development was determined to be complete when the groundwater was visually

clear and at least 10 well volumes had been removed. Additionally for the recently installed wells,

development was determined complete when turbidity was at or less than 5 NTU.

FIGURES

www.cecinc.com333 Baldwin Road - Pittsburgh, PA 15205-9072

412-429-2324 800-365-2324

DRAWN BY:DATE:

APPROVED BY:PROJECT NO:

FIGURE NO: 1

MONTOUR, LLCCCR RULE GROUNDWATER MONITORING SYSTEMCERTIFICATION REPORTMONTOUR STEAM ELECTRIC STATIONWASHINGTONVILLE, PA

CBL4/24/2017 1 " = 4,000 '

SITE LOCATION MAP - AREA 3BSJ HTW*

132-065.1202CHECKED BY:SCALE:

0 4,000 8,000SCALE IN FEET

REFERENCEUSGS TOPOGRAPHIC MAP/ ARCGIS MAP SERVICE: HTTP://GOTO.ARCGISONLINE.COM/MAPS/USA_TOPO_MAPS, ACCESSED 4/24/2017

* Hand signature on file

Document Path: \\svr-pittsburgh\projects\2013\132-065\-GIS\Maps\Area3_CCR_Certification\132065_EN01_FIG1_SITE_LOC.mxd

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DUAL 48" DIAMETER CONDUIT

AREA 3 - EAST

AREA 3 - WEST(NOT CONSTRUCTED)

UNNAMEDTRIBUTARY

MP-3-6

LD-3-1

MP-3-7MP-3-9

MP-3-8

P-3-18

MP-3-5

MW-3-1

P-3-17

MW-3-15

MW-3-16

MW-3-17

PZ3-30

P-3-20

P-3-21

PZ3-31

MW-3-102

MW-3-101

MW-3-100

MW-3-103

MW-3-104


412-429-2324 800-365-2324

DRAWN BY:DATE:


FIGURE NO: 2

MONTOUR, LLCCCR RULE GROUNDWATER MONITORING SYSTEMCERTIFICATION REPORTMONTOUR STEAM ELECTRIC STATIONWASHINGTONVILLE, PACBL

5/2/2017

CCR RULE GROUNDWATER SAMPLING LOCATIONS - AREA 3BSJ

132-065.1202CHECKED BY:SCALE: 1 " = 300 '

LEGEND! AREA 3 PADEP QUARTERLY MONITORING POINT! OTHER EXISTING MONITORING POINT+ CCR RULE GROUNDWATER MONITORING POINT

CREEKCONDUITAREA 3 BOUNDARY

REFERENCEGOOGLE EARTH PRO IMAGERYIMAGE DATE: 9/26/2014

0 300 600SCALE IN FEET

* Hand signature on fileHTW*

Document Path: P:\2013\132-065\-GIS\Maps\Area3_CCR_Certification\132065_EN01_FIG2_MONITORING_LOCS_CCR.mxd


412-429-2324 800-365-2324

DRAWN BY:DATE:


FIGURE NO: 3

MONTOUR, LLCCCR RULE GROUNDWATER MONITORING SYSTEMCERTIFICATION REPORTMONTOUR STEAM ELECTRIC STATIONWASHINGTONVILLE, PA

CBL5/2/2017

FORUTH QUARTER 2015 GROUNDWATER CONTOUR MAP - AREA 3BJH HTW*

132-065.1202CHECKED BY:SCALE:P:\2

013\13

2-065\

-GIS\M

aps\Ar

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R_Certi

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/2017

2:56 P

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* Hand signature on file

NO DATE DESCRIPTION--

SUBMITTAL & REVISION RECORD

-- --

NORTH!a

N.T.S

ATTACHMENT 1

BORING LOGS

516.2

512.2512.0

505.2

DP1

DP2

AU3

AR4

Hole Plug

4" PVC Riser

BentonitePellets#1 CleanQuartz Sand

#0 CleanQuartz Sandwithin U-Pack

10' 4"x6"U-Pack PVC0.01-slotscreen

100

100

CL

CL

Brown CLAY, trace coal fragments, moist, soft, (RESIDUAL SOIL)

Brown and black CLAY, trace coal fragments, moist, soft to loose,(RESIDUAL SOIL)

Black highly weathered SHALE, moist, (WEATHERED ROCK)Black SHALE, highly weathered, soft, massive

Wet at 10'BGS. Auger refusal at 10' BGS.

Bottom of boring at 15.0 feet.

4.0

8.08.2

15.0

KEY # Talen #119

BACKFILL 4" PVC Monitoring Well

WATER LEVELS

NOTES

WELL INSTALLED Yes

AT END OF DRILLING 3.1 ft / Elev 517.1 ft

BEFORE CORING ---

STICKUP 2.21 ft above

CASING ELEVATION 522.37 ft

Estimated Well Recovery Rate = <0.5 feet per minute

AFTER DRILLING 2.8 ft / Elev 517.3 ft

DRILLING METHOD Macrocore, HSA & Air Rotary

DRILLING CONTRACTOR Eichelbergers

OUTER CASING 6", Steel

DEVELOPMENT METHOD overpumpingCEC REP JLB

ELEVATION 520.16 ft

CORE SIZE

DATE STARTED 4/4/16 COMPLETED 4/5/16

DRILLER Shane Albert

WELL ON

EASTING 2268665.56

4/19/2016 8:21:00 AM 3.0 ft / Elev 517.2 ft

NORTHING 328700.179

DIAMETER 8.25" RESULTS clear

YIELD 45 gal

MONITORING EQUIPMENT None

DE

PT

H(f

t)

0

5

10

15

SA

MP

LE ID

SA

MP

LE T

YP

E

PAGE 1 OF 1WELL NUMBER MW-3-100

CLIENT Talen Generation, LLC

PROJECT NUMBER 132-065

PROJECT NAME Area 3

PROJECT LOCATION Washingtonville, PA

CE

C G

EN

ER

AL

BH

/ T

P /

WE

LL 1

32-

065

AR

EA

3.G

PJ

NE

W C

EC

.GP

J 4

/29/

16Civil & Environmental Consultants, Inc.333 Baldwin RoadPittsburgh, PA 15205

WELL DIAGRAM

RE

CO

VE

RY

%

U.S

.C.S

.

MATERIAL DESCRIPTION

GR

AP

HIC

LOG

NA

bjacoby

Stamp

518.5

513.5

509.5

505.0

DP1

DP2

DP3

AR4

Hole Plug

4" PVC Riser




100

100

100

CL

CL

Brown CLAY, and vegetation, moist, soft, (RESIDUAL SOIL)

Brown and black CLAY, some shale fragments, moist, soft, (RESIDUALSOIL)

Black weathered SHALE, moist, very soft, (WEATHERED ROCK)

Auger refusal at 10.5'BGSBlack SHALE, highly weathered, very soft, thinly laminated


1.5

6.5

10.5

15.0

KEY # Talen #119


WATER LEVELS

NOTES

WELL INSTALLED Yes


BEFORE CORING ---



Estimated Well Recovery Rate = >1 feet per minute






ELEVATION 520.04 ft

CORE SIZE



WELL ON

EASTING 2268909.435

4/19/2016 8:26:00 AM 5.0 ft / Elev 515.1 ft

NORTHING 328281.275


YIELD 70 gal


DE

PT

H(f

t)

0

5

10

15

SA

MP

LE ID

SA

MP

LE T

YP

E




PROJECT NAME Area 3


CE

C G

EN

ER

AL

BH

/ T

P /

WE

LL 1

32-

065

AR

EA

3.G

PJ

NE

W C

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.GP

J 4

/29/


WELL DIAGRAM

RE

CO

VE

RY

%

U.S

.C.S

.


GR

AP

HIC

LOG

NA

bjacoby

Stamp

510.5

501.3

DP1

DP2

AU3

AR4

Hole Plug

4" PVC Riser




100

100

CL

Brown and black CLAY, some shale fragments, moist, soft, (RESIDUALSOIL)

Black SHALE, highly weathered, soft, laminated

Auger refusal at 8.5'BGS


7.8

17.0

KEY # Talen #119


WATER LEVELS

NOTES

WELL INSTALLED Yes

AT END OF DRILLING ---

BEFORE CORING 5.6 ft / Elev 512.7 ft



Estimated Well Recovery Rate = 0.5 feet per minute






ELEVATION 518.29 ft

CORE SIZE



WELL ON

EASTING 2269399.482

4/19/2016 8:31:00 AM 5.6 ft / Elev 512.7 ft

NORTHING 327692.877


YIELD 190 gal


DE

PT

H(f

t)

0

5

10

15

SA

MP

LE ID

SA

MP

LE T

YP

E




PROJECT NAME Area 3


CE

C G

EN

ER

AL

BH

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P /

WE

LL 1

32-

065

AR

EA

3.G

PJ

NE

W C

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.GP

J 4

/29/


WELL DIAGRAM

RE

CO

VE

RY

%

U.S

.C.S

.


GR

AP

HIC

LOG

NA

bjacoby

Stamp

528.6

526.6

520.7

514.6

DP1

DP2

AR3

Hole Plug

4" PVC Riser




100

100

CL

CL

Brown CLAY, and organics, moist, soft, (RESIDUAL SOIL)

Brown CLAY, trace iron staining, moist, soft, (RESIDUAL SOIL)

Brown and black weathered SHALE, moist, soft, (WEATHERED ROCK)

Trace of iron staining 5.0'-7.0' BGS

Wet

Auger refusal at 8.9'BGS.Black SHALE, highly weathered to moderately weathered, soft to mediumhard, trace of iron staining


1.0

3.0

8.9

15.0

KEY # Talen #119


WATER LEVELS

NOTES

WELL INSTALLED Yes


BEFORE CORING ---









ELEVATION 529.56 ft

CORE SIZE


DRILLER Chris Brennenman

WELL ON

EASTING 2268933.966

4/19/2016 8:15:00 AM 4.1 ft / Elev 525.5 ft

NORTHING 329515.568


YIELD 112 gal


DE

PT

H(f

t)

0

5

10

15

SA

MP

LE ID

SA

MP

LE T

YP

E




PROJECT NAME Area 3


CE

C G

EN

ER

AL

BH

/ T

P /

WE

LL 1

32-

065

AR

EA

3.G

PJ

NE

W C

EC

.GP

J 4

/29/


WELL DIAGRAM

RE

CO

VE

RY

%

U.S

.C.S

.


GR

AP

HIC

LOG

NA

bjacoby

Stamp

532.4

529.8

522.4

DP1

DP2

AR3

Hole Plug

4" PVC RiserBentonitePellets#1 CleanQuartz Sand



Cave-in

100

100

CL

Light brown to brown CLAY, some iron staining, trace shale fragments,moist to moist-, soft, (RESIDUAL SOIL)

Auger refusal at 5'BGS

Black and gray highly weathered SHALE, soft, some iron staining,(WEATHERED ROCK)

Black and gray SHALE, highly weathered, soft


5.0

7.6

15.0

KEY # Talen #119


WATER LEVELS

NOTES

WELL INSTALLED Yes


BEFORE CORING ---








DEVELOPMENT METHOD bailingCEC REP JLB

ELEVATION 537.4 ft

CORE SIZE



WELL ON

EASTING 2269433.448

4/19/2016 8:34:00 AM 7.1 ft / Elev 530.3 ft

NORTHING 329351.825


YIELD 120 gal


DE

PT

H(f

t)

0

5

10

15

SA

MP

LE ID

SA

MP

LE T

YP

E




PROJECT NAME Area 3


CE

C G

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/ T

P /

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32-

065

AR

EA

3.G

PJ

NE

W C

EC

.GP

J 4

/29/


WELL DIAGRAM

RE

CO

VE

RY

%

U.S

.C.S

.


GR

AP

HIC

LOG

NA

bjacoby

Stamp

GROUNDWATER MONITORING SYSTEM …AA3/...2017/10/17 · GROUNDWATER MONITORING SYSTEM CERTIFICATION...

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Transcript of GROUNDWATER MONITORING SYSTEM …AA3/...2017/10/17 · GROUNDWATER MONITORING SYSTEM CERTIFICATION...