Groundwater System Modifaction Report

1

Winthrop, Shelby

To: Pearson, JenniferSubject: RE: USWRSWMD Groundwater System Mod Report

From: Pearson, Jennifer Sent: Thursday, May 03, 2018 4:10 PM To: Winthrop, Shelby Subject: FW: USWRSWMD Groundwater System Mod Report

Shelby,Will you please add this to the database for the Upper Southwest Class 1 Landfill?Thanks!

From: Hooper, Roy A [mailto:[email protected]]Sent: Thursday, May 03, 2018 4:02 PM To: Sadler, Bill; Pearson, Jennifer Cc: Jaros, David G.; Adams, Jody B. Subject: USWRSWMD Groundwater System Mod Report

Good afternoon Jenny,

Attached, please find the Groundwater System Modification Report for USWRSWMD detailing the decommissioning ofB 7 and B 8, and the installation of B 8R and B 15. Solid Waste Permit 265 S1 R1, AFIN 31 00107. As discussed in ourphone conversation, the certified survey will be submitted as soon as we receive it.

Thank you,

Adam Hooper, P.G. Hydrogeologist I Environmental Services

Terracon 25809 Interstate 30 South I Bryant, AR 72022P [501] 847 9292 I F [501] 847 [email protected] I terracon.com

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Rec’d Digitally

AFIN:_________________________

PMT#:_________________________S

W DOC ID#:______________________ M

DTO:___________________________

31-00107

73757

0265-S1-R1

By Shelby Winthrop at 9:23 am, May 04, 2018

BS>File <SW

Groundwater MonitoringSystem Modification

UPPER SOUTHWEST REGIONALSOLID WASTE MANAGEMENT DISTRICT LANDFILL

SOLID WASTE PERMIT 265-S1-R1AFIN 31-00107

TERRACON PROJECT 35177340May 3, 2018

Prepared for:Upper Southwest Regional

Solid Waste Management DistrictP.O. Box 909

Nashville, AR 71852

Prepared by:Terracon Consultants, Inc.

Little Rock, Arkansas

i

TABLE OF CONTENTS Page

1.0 INTRODUCTION ................................................................................................... 11.1 Site Location .............................................................................................. 11.2 Overview .................................................................................................... 1

2.0 PIEZOMETER DECOMMISSION AND INSTALLATION ...................................... 22.1 Piezometer Decommissioning .................................................................... 22.2 Piezometer Installation ............................................................................... 22.3 Piezometer Development ........................................................................... 3

3.0 SURVEY ............................................................................................................... 4

FIGURES

Figure 1 Site Location MapFigure 2 Site Layout Map

APPENDIX

APPENDIX A Field Boring LogsAPPENDIX B Piezometer Construction DiagramsAPPENDIX C Piezometer Development RecordsAPPENDIX D Survey

Reliable Responsive Convenient Innovative 1

GROUNDWATER MONITORING SYSTEM MODIFICATIONUPPER SW REGIONAL SOLID WASTE MANAGEMENT DISTRICT

ADEQ SOLID WASTE PERMIT 265-S1-R1TERRACON PROJECT 35177340

1.0 INTRODUCTION

The Upper Southwest Regional Solid Waste Management District (USWRSWMD)operates a Class 1 Municipal Solid Waste Landfill (Landfill) under Solid Waste PermitNumber 265-S1-R1 (Permit) issued by the Arkansas Department of EnvironmentalQuality (ADEQ) on August 27, 1993.

The Arkansas Department of Environmental Quality (ADEQ) issued a letter regardingthe ADEQ Review of the Alternate Groundwater Monitoring System Plan (Doc. 70010)dated July 22, 2016 and the ADEQ Review of the First Half 2016 GroundwaterMonitoring Report (Doc. 70955) dated February 6, 2017 requesting an additionalmonitoring well be installed at the facility. The ADEQ letters identified deficiencies withthe current groundwater monitoring system. This proposed groundwater monitoringsystem modification is to comply with Solid Waste Permit Number 265-S1-R1 and theADEQ correspondences.

1.1 SITE LOCATION

The USWRSWMD Landfill is located in a mined out portion of the existing BoralGypsum mine located north of Nashville, Arkansas. The Landfill is located west ofNathan Corinth Road, north of Arkansas State Highway 26 and east of the UnionPacific Railroad tracks. More specifically, the site lies in portions of Section 13 and 14of Township 8 South and Range 27 West in Howard County. The permitted acreagecorresponding to the Landfill consists of approximately 125 acres.

1.2 OVERVIEW

Site activities were conducted in accordance with the Revised Groundwater MonitoringModification Workplan, dated August 17, 2017 (document ID 72661) and approved byADEQ on October 10, 2017 (document ID 72648). Terracon decommissioned twopiezometers (B-7 and B-8). The two piezometers were not located within theUSWRSWMD property boundary and were in a low lying area that frequently floods.Terracon constructed one new piezometer, designated B-15, in a location formerlymonitored by B-7. The location of the new piezometer was chosen based on the July22, 2016 and February 6, 2017 ADEQ letters. In addition, Terracon installed a

Groundwater Monitoring System ModificationUpper Southwest Regional Solid Waste Management DistrictMay 3, 2018 Terracon Project No. 35137203


replacement piezometer for B-8 located southeast of the decommissioned piezometer.The replacement piezometer is designated B-8R.FIGURE 2 provides the locations of the two piezometers that were decommissionedand the two piezometers that were installed at the site.

2.0 PIEZOMETER DECOMMISSION AND INSTALLATION

2.1 PIEZOMETER DECOMMISSIONING

A Terracon registered professional geologist oversaw the decommissioning ofpiezometers B-7 and B-8. Decommissioning was performed in accordance with theADPC&E Interim Policy No. PRCR 96-4. Decommissioning activities occurred onJanuary 31 and February 1, 2018. Access to piezometer B-7 was restricted due to poorground conditions. In addition, the piezometer was observed to be significantly burieddue to its location in a low lying, frequently flooded area. Based on site conditions, B-7was plugged and abandoned in-place per verbal approval from ADEQ. The piezometerwas filled with bentonite chip “holeplug” from bottom of the piezometer to the top ofcasing (TOC). The bentonite chips were then hydrated to ensure the casing was fullyplugged.

Piezometer B-8 was plugged and abandoned by utilizing the following methodology:

The metal protective collar and concrete pad was removed; The PVC casing and screen were pulled from the boring; The boring was overdrilled with 6.25-inch outside diameter augers to the total depth

of 40 feet bgs; The boring was filled with bentonite chip “holeplug” from the bottom of the boring to

approximately 0.5 feet bgs. The hole plug was then be hydrated with potable water;and,

The boring was filled with clean fill material (soil) from approximately 0.5 feet bgs toground surface.

2.2 PIEZOMETER INSTALLATION

On January 30 and 31, 2018 the soil borings were advanced at the approved locationsand subsequently converted into piezometers.

Drilling services were performed by Anderson Engineering of Little Rock, Arkansas.Soil borings were advanced utilizing an ATV mounted CME drill rig with 8.25-inchoutside diameter hollow stem augers. Soil samples were collected using a 5-footcontinuous barrel sampler in order to log the site lithology. Drilling was stopped every



five feet within the estimated groundwater zone to observe potential groundwaterinfiltration. Drilling and well construction methodology were conducted in accordancewith ASTM D5092 Standard Practice for Design and Installation of GroundwaterMonitoring Wells in Aquifers under the supervision of a qualified geologist. Boring Logsare included in APPENDIX A.

During field activities, the two new piezometers were constructed as follows:

Installation of 15 feet of 2-inch diameter, 0.010-inch machine-slotted PVC screenwith a threaded bottom cap;

Installation of 2-inch diameter, threaded, flush-joint PVC riser pipe to bring thecasing approximately 3 feet above ground surface;

Addition of pre-sieved 16/30 grade silica sand for annular sand pack around thescreen from the bottom of the boring to approximately 2 feet above the top of thescreen;

Placement of 3 to 5 feet of hydrated bentonite pellets above the sand pack; Addition of bentonite chips to the surface; and, A lockable cap was installed over the top of the casing. A 3-foot X 3-foot cement

surface pad with a steel or aluminum protective casing was set 12-inches into thecement surface pad. The piezometer was installed with a minimum of 2-feet ofstickup. Each well has a fixed label outside of the well casing as required by Reg22.1103(d). Protective post were installed around the piezometer in accordancewith Reg 22.1103(e).

Groundwater monitoring well construction diagrams are included in APPENDIX B.

TABLE 1Groundwater Monitoring Well Construction Details

USWRSWMD

PiezometerI.D.

TotalDepth (ft)1

Screen Lengthand Bottom Cap

(ft)

Riser Lengthand Stick-up

(ft)

Depth toSand (ft)2

Depth toBentoniteSeal (ft)2

B-15 42.50 15.3 27.20 22 19B-8R 27.54 15.3 12.24 7 4

Ft1 – Depth from top of casingFt2 – Depth below ground surface

2.3 PIEZOMETER DEVELOPMENT

Upon completion of piezometer installation, the new piezometers were developed witha submersible pump. Development water was discharged to the surface. Field



measurements of turbidity were accomplished with the use of a portable meter duringdevelopment. The volume of water removed and water quality readings were recordedduring piezometer development. This information was recorded on standardGroundwater Monitoring Sampling Records presented in APPENDIX C.

3.0 SURVEY

Following installation of the new piezometers, the locations and elevations of all wells inthe network were surveyed by Butler and Associates, Inc. Elevations were recorded tothe nearest 100th of a foot above mean sea level (fmsl) from the high side of PVCcasing and relative to the North American Vertical Datum of 1988 (NAVD 88).Horizontal control is referenced to the approved site grid system which corresponds tothe Arkansas State Plane coordinate system, North American Datum of 1983 (NAD 83).The top of PVC casing elevation, surface elevation, and location coordinates arepresented in APPENDIX D.

FIGURES

BM1

BM3

BM2

APPR

OX. P

ROPE

RTY

BOUN

DARY

B-1

B-2

B-5

B-4

B-3

B-9R

B-10

R

B-6R

B-13

B-11

B-12

B-14

ACCE

SS RO

AD

DRY

588.8

957

6.60

570.7

1

C-1R

518.0

1

533.2

4

551.1

7

S-UDN-

UD

GGP

-1

GGP

-2

GGP

-3

GGP

-4

GGP

-5

GGP

-6

SEDI

MENT

ATIO

N PO

ND

CLAS

S I LA

NDFIL

L

577.7

3

512.3

4

513.5

7

518.4

2

513.1

2

515.1

1

511.5

9 539.2

4

B-7

B-15

B-8

B-8R

DESI

GNED

BY:

SCAL

E:AP

PVD.

BY:

DRAW

N BY

:

DATE

:

SHEE

T NO

.:

JOB

NO.

OF

BYDE

SCRI

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NDA

TERE

V.

ACAD

NO.

2580

9 I-3

0 SOU

THBR

YANT

, AR

7202

2FA

X. (5

01) 8

47-9

210

PH. (

501)

847-

9292

Con

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and

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GROU

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ATER

MON

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REPO

RTUP

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T RE

GION

AL S

OLID

WAS

TE M

ANAG

EMEN

T DI

STRI

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GROU

NDW

ATER

MON

ITOR

ING

WEL

L LOC

ATIO

N MA

P

HOW

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TYAR

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PTG

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USW

RSW

MD S

ANIT

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LAND

FILL

N

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SCAL

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FEE

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125

250

500

LEGE

ND:

GROU

NDW

ATER

MON

ITOR

ING

WEL

L

GROU

NDW

ATER

SUR

FACE

ELE

VATI

ON (f

msl)

588.8

9

B-11

GAS

MONI

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NG P

ROBE

GGP

-1

NEW

GRO

UNDW

ATER

MON

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ING

WEL

L

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DECO

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DWAT

ERB-

7

B-8R

APPENDIX A

Depth

5

0

DESCRIPTIONBGS

SAMPLING METHOD:N: E:

DRILLING METHOD:

G.S. ELEV.

FIELD BORING LOG

TOTAL DEPTH: FEET BELOW GROUND SURFACE (BGS)CLIENT: PROJECT:

LOGGED BY:DATE DRILLED:

JOB NO.:DRILLER:RIG TYPE:

DRILLING CO.:

BORING NO.: PAGE:

10

15

20

25

30

25809 I-30 South BRYANT, AR. 72022FAX. (501) 847-9210PH. (501) 847-9292

Consulting Engineers and Scientists

Litho.Symbol Remarks

CONTINUOUSNA NA

HOLLOW STEM AUGER

NA

ANDERSON ENGINEERING

GROUNDWATER MONITORING WELL INSTALLATIONUPPER SOUTHWEST REGIONAL SOLID WASTE

ADAM HOOPER

1/31/2018

061-001-35177340-001

GARY MOYERS

CME-55 ATV

25

B-8R 1 of 1

0'-0.5' Topsoil/Organics

Total Depth of Boring at 25' bgs

Wet zones at 10.5' bgs, 19' bgs, and 20'-25' bgs

0.5'-6' SILTY CLAYbrown and gray, soft, moist

6'-25' SILTY CLAYgray, mottled with zones of limestone fragments andhard clay layers

Groundwater at 10' bgs after approx. 30 mins

BORING NO.:

DESCRIPTIONN: E:

FIELD BORING LOGPAGE:

TOTAL DEPTH: FEET BELOW GROUND SURFACE (BGS)CLIENT: PROJECT:JOB NO.:LOGGED BY:DATE DRILLED: RIG TYPE:

SAMPLING METHOD:DRILLING METHOD:

DRILLER:DRILLING CO.:

0

G.S. ELEV.

10

DepthBGS

Litho.Symbol Remarks

20

30

5

15

25

35

25809 Interstate-30 BRYANT, AR. 72022FAX. (501) 847-9210PH. (501) 847-9292


40

NANANACONTINUOUS

HOLLOW STEM AUGER

CME-55 ATV

GARY MOYERS

ANDERSON ENGINEERING

1/30/2018

ADAM HOOPER

061-001-35177340-002

GROUNDWATER MONITORING WELL INSTALLATIONUPPER SOUTHWEST REGIONAL SOLID WASTE

40

1 of 1B-15

0'-1' Topsoil

Total Depth of Boring at 40' bgs

reddish brown clay1'-9' CLAYgray with gypsum fragments, soft, possible fill

Groundwater encountered at 34' bgs

Groundwater at 12.4' bgs approx. 1 hour afterdrilling

material

9'-17' SILTY CLAYreddish tan to gray, mottled with limestone andgypsum fragments

17'-17.5' Fill material (gypsum wall board)17.5'-34' SILTY CLAYdark gray, loose, dry with limestone and gypsumfragments and zones with brown clay mottles

34'-35.5' CLAYwith weathered limestone, brittle, greenish gray, wet35.5'-40' CLAYred, tan, and gray, mottled with thin zones of silty clay, very stiff, trace gravel

APPENDIX B

Granular Backfill MaterialRiser Diameter & MaterialScreen Diameter & MaterialDatum for Water Level Measurement

Drilling Method

Datum ElevationJob NumberJob Name

Slot Size

Terracon RepresentativeBorehole Diameter

Drilling Contractor

LocationWell Number

Installation DateSurface Elevation

PIEZOMETER INSTALLATION RECORD




Granular Backfill MaterialRiser Diameter & MaterialScreen Diameter & MaterialDatum for Water Level Measurement

Drilling Method

Datum ElevationJob NumberJob Name

Slot Size

Terracon RepresentativeBorehole Diameter

Drilling Contractor

LocationWell Number

Installation DateSurface Elevation





APPENDIX C

PROJECT: USWRWMDSAMPLING LOCATION: B-15WEATHER CONDITIONS: Clear, 65FMONITORING WELL CONDITION:

WELL LOCKED? Yes WELL NUMBER LABELED? YesCASING CONDITION: OKDATUM FOR WATER DEPTH MEASUREMENT: T.O.C.GENERAL WELL EXTERIOR/INTERIOR CONDITIONS: OK

DECON FIELD EQUIPMENT: Distilled WaterWATER DEPTH (WD): 13.54 TOTAL DEPTH OF WELL (TD): 42.50VOLUME OF WATER IN WELL:

V = 0.0408 x [TD-WD(feet)] x [Well Diameter (inches)]2 = 4.72 GallonsWATER CONDITION BEFORE WELL PURGING:

APPEARANCE: Turbid ODOR: YesWELL PURGING DATE: 3-27-18 PURGING METHOD: Submersible pump

TIME START PURGING: 1140 TIME END PURGING: 1226VOLUME PURGED (Try for 3 Volumes): 25 galAPPEARANCE: N/A ODOR: N/AWELL PURGED DRY? No

SAMPLING DATE: N/A SAMPLING METHOD: N/ATIME START SAMPLING: N/A TIME END SAMPLING: N/A

FIELD MEASUREMENTS: (Need at least 3 consecutive readings w/in 10% for stabilization)TIME RATE GALLONS TEMP pH CONDUCTANCE TURBIDITY1140 1.0 >1000 NTU1148 5.0 >1000 NTU1158 10.0 >1000 NTU1206 15.0 >1000 NTU1215 20.0 >1000 NTU1226 25.0 120 NTU

FIELD SAMPLE PRESERVATION:CONTAINER HANDLING:COMMENTS:

PROJECT: USWRWMDSAMPLING LOCATION: B-8RWEATHER CONDITIONS: Clear, 65FMONITORING WELL CONDITION:

WELL LOCKED? Yes WELL NUMBER LABELED? YesCASING CONDITION: OKDATUM FOR WATER DEPTH MEASUREMENT: T.O.C.GENERAL WELL EXTERIOR/INTERIOR CONDITIONS: OK

DECON FIELD EQUIPMENT: Distilled WaterWATER DEPTH (WD): 13.84 TOTAL DEPTH OF WELL (TD): 27.54VOLUME OF WATER IN WELL:

V = 0.0408 x [TD-WD(feet)] x [Well Diameter (inches)]2 = 2.20 GallonsWATER CONDITION BEFORE WELL PURGING:

APPEARANCE: Turbid ODOR: NoneWELL PURGING DATE: 3-27-18 PURGING METHOD: Submersible pump

TIME START PURGING: 1236 TIME END PURGING: 1247VOLUME PURGED (Try for 3 Volumes): 7.2 galAPPEARANCE: N/A ODOR: N/AWELL PURGED DRY? Yes

SAMPLING DATE: N/A SAMPLING METHOD: N/ATIME START SAMPLING: N/A TIME END SAMPLING: N/A

FIELD MEASUREMENTS: (Need at least 3 consecutive readings w/in 10% for stabilization)TIME RATE GALLONS TEMP pH CONDUCTANCE TURBIDITY1236 2.0 >1000 NTU1239 3.0 >1000 NTU1241 4.0 >1000 NTU1243 5.0 >1000 NTU1245 6.0 >1000 NTU1247 Dry at 7.2

FIELD SAMPLE PRESERVATION:CONTAINER HANDLING:COMMENTS:

APPENDIX D

Well ID Northing Easting Top of CasingElevation

Adj. GroundElevation

Total Depth(from ToC)

B-1 1827307.4600 757940.6550 591.67 589.06 16.15B-2 1826345.2010 757940.5050 614.60 612.06 39.05B-3 1825520.2130 756205.4900 589.71 586.95 17.70B-4 1826209.4820 757201.3600 604.27 601.88 41.65B-5 1826183.1030 757579.5100 609.62 607.18 43.65B-6R 1825918.6820 756574.6590 576.27 573.12 37.30B-8R 1827122.0810 755586.8360 528.95 525.86 27.54B-9R 1825188.9940 754533.9150 546.92 543.86 27.80B-10R 1825401.2590 754745.7060 526.86 524.03 27.60B-11 1825835.6350 754127.8480 533.69 530.50 31.18B-12 1826018.5970 753212.0100 554.21 550.93 73.00B-13 1826809.1290 755034.1170 531.96 528.86 47.90B-14 1826487.9350 755909.2700 545.03 542.23 40.90B-15 1826520.6930 754388.8160 525.13 522.08 42.50C-1R 1826061.2060 756149.6560 527.13 524.22 22.70

Note:

Survey of Monitoring WellsUSWRSWMD

Howard County, Arkansas

1. Northing and Easting Locations are at top of well PVC casing.2. Top of PVC casing elevation (ToC) measured on north side of pipe.3. Top of adjacent ground elevation measured at north side of well just beyond concrete pad.

4. Field measurements collected by Butler & Associates on April 2, 2018 using the State Plane Projection,Arkansas South, NAD83.

Documents

Groundwater System Modifaction Report