9404_WashingtonCounty_CDLF_GWMR_20170918

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September 2017 Groundwater Monitoring Report

Washington County C&D Landfill
Roper, North Carolina
NC Solid Waste No. 94-04 CDLF-1996

Prepared for:

Washington County
P.O. Box 1007
Plymouth, North Carolina 27962

December 2017

Prepared by:

© 2017 Smith Gardner, Inc.
This document is intended for the sole use of the client for which it was prepared and
for the purpose agreed on by the client and Smith Gardner, Inc.

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September 2017 Groundwater Monitoring Report

Washington County C&D Landfill
NC Solid Waste No. 94-04 CDLF-1996

Prepared For:
Washington County
Plymouth, North Carolina

S+G Project No. WASH 08-2

Madeline German, P.G.
Project Geologist

Joan A. Smyth, P.G.
Senior Hydrogeologist

December 2017

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12/14/2017
12/14/2017

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Washington County C&D Landfill September 2017 Groundwater Monitoring Report
December 2017 Table of Contents Page i
Washington County C&D Landfill
NC Solid Waste Permit No. 94-04-CDLF-1996

September 2017 Groundwater Monitoring Report

Table of Contents
Page

1.0 INTRODUCTION ......................................................................................................... 1 
2.0 REGIONAL GEOLOGY ................................................................................................. 1 
3.0 SAMPLING LOCATIONS ............................................................................................. 1 
4.0 SAMPLING PROCEDURES ......................................................................................... 1 
5.0 LABORATORY DATA ................................................................................................... 2 
5.1 Laboratory Analysis ................................................................................................... 2 
5.2 Laboratory Results .................................................................................................... 2 
6.0 GROUNDWATER CHARACTERIZATION ...................................................................... 2 
7.0 CONCLUSIONS .......................................................................................................... 3 

FIGURE
Figure 1 Site Map
Figure 2 Potentiometric Surface Map

TABLES
Table 1 Groundwater Elevation Data
Table 2 Field Parameters
Table 3 Detected Inorganic Constituents
Table 4 Groundwater Gradients and Velocities

APPENDICES
Appendix A Laboratory Analytical Report

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Washington County C&D Landfill September 2017 Groundwater Monitoring Report
December 2017 Table of Contents Page

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Washington County C&D Landfill September 2017 Groundwater Monitoring Report
December 2017 Page 1
1.0 INTRODUCTION
The Washington County Construction and Demolition (C&D) Landfill, operating under Solid
Waste Permit #94-04-CDLF-1996, is required to perform semi-annual groundwater monitoring
in accordance with Solid Waste Section Rule 15A NCAC 13B.0500 (et. seq.). This report presents
the semi-annual sampling results for the event conducted on September 18, 2017.

The Washington County Landfill is currently accepting C&D waste. The groundwater monitoring
network includes four wells located around the landfill perimeter. This report summarizes field
procedures, laboratory analyses and groundwater characterization for the site.
2.0 REGIONAL GEOLOGY
The Washington County Landfill is located near Roper, North Carolina. According to the
Geologic Map of North Carolina (USGS, 1985) this site is underlain by Quaternary surficial
deposits including sand, gravel, clay and peat deposited in marine, fluvial, aeolian and
lacustrine environments; typical for a coastal plain environment.
3.0 SAMPLING LOCATIONS
The groundwater monitoring network consists of four wells (CD-1 through CD-4) positioned
around the landfill perimeter (Figure 1). CD-4 serves as the background well for this site.
Wells were advanced to approximately 20 feet below ground surface. Boring logs could not be
located for these wells. Well construction details are provided in Table 1.
4.0 SAMPLING PROCEDURES
The sampling event, reportedly performed by Environment 1, Inc. on September 18, 2017,
included collecting samples from four groundwater wells (CD-1 through CD-4) in accordance
with the approved site Sampling and Analysis Plan1. No surface water sampling locations are
identified for this site.

The depth to water in each well was gauged prior to purging and sampling. Water table
elevation data is included in Table 1. Field measurements for pH, specific conductivity and
temperature were also recorded at each well. A field parameter summary is presented as
Table 2.

Samples were collected in laboratory prepared containers for the specified analytical
procedures. Groundwater samples were properly preserved, placed on ice and transported to
the laboratory facility within the specified holding times for each analysis.

1 Water Quality Monitoring Plan, S&ME, August 1, 1994.
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Washington County C&D Landfill September 2017 Groundwater Monitoring Report
December 2017 Page 2
5.0 LABORATORY DATA
5.1 Laboratory Analysis
The groundwater samples were transported to Environment 1, Inc., in Greenville, NC, a
North Carolina certified laboratory (NC Wastewater ID #10). Samples were analyzed for
the Appendix I volatile organic compounds (VOCs) plus tetrahydrofuran per United States
Environmental Protection Agency (EPA) Test Method 8260B, and Appendix I and C&D
metals via EPA Test Method 200.7 or 200.8. Iron, total alkalinity, chloride, total dissolved
residue and sulfate were analyzed by the Solid Waste Section (SWS) approved method
listed in the lab report. The laboratory analytical report is included as Appendix A.
5.2 Laboratory Results
Cobalt (CD-1 and CD-2) was reported at concentrations, in collected samples above its
GWP Standard. Iron (CD-1, CD-2, and CD-3) and manganese (CD-1, CD-2 and CD-3)
were reported at concentrations above their respective 2L standards in samples
collected this event. Additional dissolved inorganic analysis was performed for these
three parameters. Concentrations in dissolved analysis decreased, however not below
the 2L or GWP Standards.

No VOCs were reported above the laboratory method detection limit (MDL) in samples
collected this event.

Constituents reported between the MDL and the Solid Waste Section Quantitation Limit
(SWSL) are defined by the laboratory as “J” qualified values. Detected constituents are
presented in Table 3.
6.0 GROUNDWATER CHARACTERIZATION
A single-day potentiometric surface map was prepared from groundwater data collected from
both the C&D landfill and the adjacent MSW landfill during this sampling event. The data
indicate that groundwater flows generally in a northern direction.

Groundwater flow velocities were calculated for site monitoring wells using the equation:

V = Ki/n

where K = hydraulic conductivity
i = groundwater gradient
n = porosity

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Washington County C&D Landfill September 2017 Groundwater Monitoring Report
December 2017 Page 3
Groundwater flow average velocities were 4.67x10-3ft/day. Hydraulic conductivity data
interpreted from November 2011 Design Hydrogeologic Report2. Well gradients and velocities
are presented in Table 4. The potentiometric surface map is presented as Figure 2.
7.0 CONCLUSIONS
The analytical data show relatively stable groundwater quality at the Washington County C&D
Landfill. The inorganic constituents detected are potentially naturally occurring due to their
presence in the soils across North Carolina.

The next groundwater monitoring event is tentatively scheduled for March 2018. Results will be
reported to North Carolina Department of Environmental Quality (NCDEQ) after receipt of
laboratory analysis.

2 Design Hydrogeologic Report, Washington County C&D Landfill (Permit 94-04), prepared by Richardson Smith
Gardner and Associates, November 2011.
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FIGURE

September 2017 Groundwater Monitoring Report
Washington County C&D Landfill
NC Solid Waste Permit No. 94-04-CDLF-1996
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G:\CAD\Washington County\Wash 08-2\sheets\WASH-B0061.dwg - 11/21/2017 11:15 AMDRAWN:APPROVED:PROJECT NO:SCALE:FILENAME:DATE:FIGURE NO.PREPARED BY:PREPARED FOR:SMITH14 N. Boylan Avenue, Raleigh NC 27603NC LIC. NO. F-1370 (ENGINEERING)919.828.0577GARDNER+© 2017 Smith Gardner, Inc.WASHINGTON COUNTYMSW AND C&D LANDFILLSSITE MAPSEPTEMBER 2017J.A.L.M.M.G.AS SHOWN1Nov 2017WASH 08-2WASH-B0061DocuSign Envelope ID: 639D5F31-5A95-442D-B245-0D52B5E9009F
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CD-1
TOC=7.81
DTW=6.21
GWE=1.60
CD-2TOC=7.68
DTW=5.81
GWE=1.87
CD-3
TOC=7.77
DTW=5.51
GWE=2.26
CD-4
TOC=9.11
DTW=6.69
GWE=2.42
MW-1
TOC=10.01
DTW=7.48
GWE=2.53
MW-2
TOC=9.70
DTW=9.50
GWE=0.20
MW-3
TOC=11.30
DTW=8.95
GWE=2.35
MW-4
TOC=9.02
DTW=6.31
GWE=2.71
G:\CAD\Washington County\Wash 08-2\sheets\WASH-B0061.dwg - 11/27/2017 1:58 PMDRAWN:APPROVED:PROJECT NO:SCALE:FILENAME:DATE:FIGURE NO.PREPARED BY:PREPARED FOR:SMITH14 N. Boylan Avenue, Raleigh NC 27603NC LIC. NO. F-1370 (ENGINEERING)919.828.0577GARDNER+© 2017 Smith Gardner, Inc.WASHINGTON COUNTYMSW AND C&D LANDFILLSPOTENTIOMETRIC SURFACE MAPSEPTEMBER 2017J.A.L.M.M.G.AS SHOWN1Nov 2017WASH 08-2WASH-B0061MW-1
TOC=
DTW=
GWE=
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TABLES

September 2017 Groundwater Sampling Report
Washington County C&D Landfill
NC Solid Waste Permit No. 94-04-CDLF-1996
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Table 1Groundwater Elevation DataWashington County C&D LandfillSeptember 18, 2017By: CGDate: 12/6/2017WellWell Installation DateLatitude LongitudeWell Diameter (inches)Total Well Depth (feet bgs)Ground Surface Elevation (feet amsl)TOC Elevation (feet amsl)Depth to Water (feet)Groundwater Elevation (feet)Screen Interval* (feet bgs)Screen Geology** (comparison boring)CD-1 NA 35.92306 76.66425 2.0 22.90 3.16 7.81 6.21 1.6 13-23 sand (B-2)CD-2 NA 35.92324 76.66343 2.0 19.90 4.48 7.68 5.81 1.87 10-20 sand (B-3)CD-3 NA 35.92353 76.66247 2.0 21.45 5.47 7.77 5.51 2.26 11.5-21.5 sand (B-3)CD-4 NA 35.92184 76.66252 2.0 20.67 5.19 9.11 6.69 2.42 11-21 sand (B-7)Note:1. Well locations and elevations provided by Sanborn, Charlotte, NC from field survey conducted on 4/8/09.2. Depth to water measured from top of PVC casing.3. *Screen interval assumed as 10 feet for all locations4. ** Nearby soil borings were used to determine geology in monitoring wells.5. Total Well Depth and Depth to Water from Environmental 1. Report date 11/1/2017, Client ID# 6030 NA = not availableH:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Washington Co, NC\C&D\20. Sept 2017\sept17-washington co. CD_tables.xlsxDocuSign Envelope ID: 639D5F31-5A95-442D-B245-0D52B5E9009F
Table 2Field ParametersWashington County C&D LandfillSeptember 18, 2017By:CG Date:11/14/2016WellpHstd units)Specific Conductivity(umhos/cm)Temperature(celsius)Turbidity(NTU)CD-1 4.1 312 22 3.23CD-2 4.9 439 22 2.39CD-3 5.1 80 22 <1CD-4 5.1 57 22 <1Note: Lab data from Environmental 1, Inc. Report 11/1/2017, Client ID# 6030 H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Washington Co, NC\C&D\20. Sept 2017\sept17-washington co. CD_tables.xlsxDocuSign Envelope ID: 639D5F31-5A95-442D-B245-0D52B5E9009F
Table 3Detected Inorganic ConstituentsWashington County C&D LandfillSeptember 18, 2017BY: CGDate: 4/18/2017Parameter MDL SWSL2L or GWP* StandardMCL CD-1 CD-2 CD-3 CD-4Alkalinity (mg CaCo3/l) 1.0 NE NE NE 4.1 4.9 5.1 5.1Chloride (mg/l) 5.0 5 250 250 11 26 9 11Sulfate (mg/l) 1.04 250 250 250 218J 243J 21.4J 9.4JTotal Dissolved Residue (mg/l 1 NE 500 500 375 469 112 46Arsenic 0.07 10 10 10 0.41J 0.41J <0.07 0.15JBarium 0.07 100 700 200 14.4J 25.7J 28.1J 18.1JBeryllium 0.07 1 4* 4 3 0.37J 0.18J 0.21JCadmium 0.08 1 2 5 0.61J 0.16J <0.08 <0.08Cobalt 0.24 10 1* NE17 100.69J 1.1JCobalt Filtered 0.02 10 1* NE158.3J ns 0.97JCopper 0.09 10 1000 1300 0.46J 0.46J 0.22J <0.09Iron 13.27 300 300 3009117 8128 56888JIron Filtered 13.6 300 300 3008401 6528 490nsLead 0.08 10 15 15 0.27J <0.08 <0.08 <0.08Manganese 1.28 50 50 50341 1160 20036JManganese Filtered0.0250 50 50317 1086 192nsNickel 0.08 50 100 NE 4.1J 3.0J 0.29J <0.08Selenium 0.51 10 20 50 4.2J 1.0J <0.51 <0.51Thallium 0.08 5.5 NE 2 <0.08 0.11J <0.08 <0.08Vanadium 0.24 25 0.3* NE 0.25J 2.7J 0.35J 0.74JVanadium Filtered 0.24 25 0.3* NE <0.24 <0.24 <0.24 <0.24Zinc 0.66 10 1000 5000 21 8.1J 1.1J 1.1JNote: MDL -Method Detection LimitSWSL -Solid Waste Section Quantitation Limit2L-Groundwater Standard (15A NCAC 2L 0200)GWP*-Groundwater Protection Standard (indicated with *)MCL -Federal Maximum Contaminant Limit<MDL -Not detected at or above the MDLBold -Detected above 2L or GWP StandardJ-Laboratory defined as a constituent concentration between the MDL and the SWSLNE -Standard Not Establishedns - not sampledLab data from Environmental 1, Inc. Report 11/1/2017, Client ID# 6030 Results are presented in ug/l (ppb), unless otherwise noted.H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Washington Co, NC\C&D\20. Sept 2017\sept17-washington co. CD_tables.xlsxDocuSign Envelope ID: 639D5F31-5A95-442D-B245-0D52B5E9009F
Table 4Groundwater Gradients and VelocitiesWashington County C&D LandfillSeptemnber 18, 2017By: MGDate: 12/11/2017WellGroundwater Elevation (feet)Hydraulic Conductivity (cm/sec)Porosity (%) GradientVelocity (cm/sec)Velocity (ft/day)CD-1 1.6 1.31E-04 0.184 0.0023 1.6553E-06 4.69E-03CD-2 1.87 1.31E-04 0.184 0.0033 2.35658E-06 6.68E-03CD-3 2.26 1.31E-04 0.184 0.0034 2.39146E-06 6.78E-03CD-4 2.42 1.31E-04 0.184 0.0003 1.89238E-07 5.36E-04Avg V (ft/day) 4.67E-03Note: Velocity Calculated from V=K*i/nV = velocityK = Hydraulic Conductivityi = Gradientn = PorosityWater level data collected by Environment 1 personnel.Hydraulic Conductivity and porosity values averaged from November 2011 Richardson Smith Gardner and Associates, Inc. Design Hydrogeologic ReportH:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Washington Co, NC\C&D\20. Sept 2017\sept17-washington co. CD_tables.xlsxDocuSign Envelope ID: 639D5F31-5A95-442D-B245-0D52B5E9009F

Appendix A
Laboratory Analytical Report

September 2017 Groundwater Monitoring Report
Washington County C&D Landfill
NC Solid Waste Permit No. 94-04-CDLF-1996
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