9402_WashingtonCountyMSWLF_GWMR_DIN27631_20161122

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September 2016 Groundwater Monitoring Report

Washington County Closed MSW Landfill
Roper, North Carolina
NC Solid Waste Permit No. 94-02 – MSWLF-1980

Prepared for:

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

November 2016

Prepared by:

© 2016 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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Washington County Closed MSW Landfill September 2016 Groundwater Monitoring Report
November 2016 Table of Contents Page i

Washington County Closed MSW Landfill
NC Solid Waste Permit No. 94-02-MSWLF 1980

September 2016 Groundwater Monitoring Report

Table of Contents
Page

1.0 INTRODUCTION ......................................................................................................... 1 
2.0 REGIONAL GEOLOGY ................................................................................................. 1 
3.0 SAMPLING PROCEDURES ......................................................................................... 1 
4.0 FIELD & LABORATORY DATA ..................................................................................... 1 
4.1 Laboratory Analysis ................................................................................................... 1 
4.2 Field Parameter Results .......................................................................................... 2 
4.3 Laboratory Results .................................................................................................... 2 
5.0 GROUNDWATER CHARACTERIZATION ...................................................................... 2 
6.0 CONCLUSIONS .......................................................................................................... 2 

FIGURE
Figure 1 Washington County Landfill Site Map

TABLES
Table 1 Groundwater Elevation Data
Table 2 Field Parameter Results
Table 3 Detected Constituents

APPENDICES
Appendix A Well Logs
Appendix B Laboratory Analytical Reports
Appendix C Organic Constituent Results - Graphs

Washington County Closed MSW Landfill September 2016 Groundwater Monitoring Report
November 2016 Table of Contents Page ii

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Washington County Closed MSW Landfill September 2016 Groundwater Monitoring Report
November 2016 Page 1
1.0 INTRODUCTION
The Washington County Closed unlined, Municipal Solid Waste (MSW) Landfill, operating under
Solid Waste Permit #94-02-MSWLF-1980, is required to conduct 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 19,
2016; and includes a field procedure summary, laboratory analyses and groundwater
characterization for the site. The laboratory analytical results and a single-day potentiometric
surface map are also included.
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 that include sand, gravel, clay and peat deposited in marine, fluvial, eolian and
lacustrine environments; typical for a coastal plain environment.
3.0 SAMPLING PROCEDURES
The sampling event, reportedly performed by Environment 1, Inc. on September 19, 2016,
included sample collection from four groundwater monitoring wells (MW-1 through MW-4).
Well logs are presented in Appendix A. No surface water monitoring locations are identified for
this site. A trip blank was analyzed for Appendix I volatile organic compounds (VOCs) for quality
control purposes.

Sampling methods followed the protocol outlined in the North Carolina Water Quality
Monitoring Guidance Document for Solid Waste Facilities (North Carolina Department of
Environment and Natural Resources, Division of Waste Management1). The depth to water in
each well was gauged prior to purging and sampling. Field measurements for pH, specific
conductivity and temperature were recorded for each well.

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.
4.0 FIELD & LABORATORY DATA
4.1 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 VOCs via United States Environmental Protection Agency (EPA) Test

1 Solid Waste Section Guidelines for Groundwater. Soil, and Surface Water Sampling, NC DENR, DWM, SWS, Rev 4-
08.

Washington County Closed MSW Landfill September 2016 Groundwater Monitoring Report
November 2016 Page 2
Method 8260B and metals via EPA Test Method 200.8. Constituents detected between
the Method Detection Limit (MDL) and Solid Waste Section Quantitation Limit (SWSL) are
defined by the laboratory as “J” qualified values; indicating they are not quantifiable
values. The laboratory analytical report is included as Appendix B.
4.2 Field Parameter Results
Temperature, pH and specific conductance were measured in the field at the time of
sampling. The field parameter results are summarized in Table 2 and have remained
consistent with previously reported sampling events.
4.3 Laboratory Results
No inorganic constituents were reported above their 15A NCAC 2L.0100 et seq Standard
(2L) this event. Only arsenic in MW-2 was reported at its 2L Standard. The majority of
inorganic parameters were non-detectable or J-qualified.

No organic constituents were reported above their 2L Groundwater Standards from
samples collected this event. Chlorobenzene and 1,4-dichlorobenzene were reported as
detected in MW-2 at concentrations below their 2L Groundwater Standards.

Detected constituents are presented in Table 3. Historical detected organic constituent
graphs are included in Appendix C.
5.0 GROUNDWATER CHARACTERIZATION
A single-day potentiometric surface map was prepared from groundwater data collected during
this sampling event; from both the closed MSW landfill and the adjacent Construction and
Demolition (C&D) landfill. The groundwater elevations indicate that groundwater flows in a
general north - northwesterly direction. Hydraulic conductivity data is not available for these
wells so groundwater velocities could not be calculated. The potentiometric surface map is
presented as Figure 1.
6.0 CONCLUSIONS
Laboratory results indicate that water quality at the Washington County Closed MSW Landfill is
generally consistent with reported historical detections. No organic constituents were reported
above their 2L values this event. Chlorobenzene, 1,4-dichlorobenzene and benzene
concentrations are below their 2L groundwater standards and are within the range of historical
detections in MW-2 and MW-3.

The next groundwater monitoring event is scheduled for March 2017. Results will be reported
to NCDEQ following laboratory analysis.

FIGURE

September 2016 Groundwater Monitoring Report
Washington County Closed MSW Landfill
NC Solid Waste Permit No. 94-02-MSWLF-1980

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CD-1
TOC=7.81
DTW=5.82
GWE=1.99
CD-2
TOC=7.68
DTW=5.26
GWE=2.42
CD-3
TOC=7.77
DTW=4.83
GWE=2.94
CD-4
TOC=9.11DTW=5.44
GWE=3.67
MW-1
TOC=10.01
DTW=6.66
GWE=3.35
MW-2
TOC=9.70
DTW=7.50
GWE=2.20
MW-3
TOC=11.30
DTW=8.53
GWE=2.77
MW-4
TOC=9.02
DTW=5.13
GWE=3.89
3.0
3.5
2.0
2.0
3.5
2.5
3.0
2.5
NOTES
1.THE TIRE MONOFILL IS NO LONGER USED BY THE COUNTY. THIS
AREA WAS PREVIOUSLY INCORPORATED INTO THE C & D
LANDFILL FOOTPRINT.
PHASE 2 C&D
LANDFILL AREA
PHASE 1 C&D
LANDFILL AREA
APPROXIMATE PROPERTY
LINE (SEE REFERENCE 1)
PHASE 1 TIRE MONOFILL
(SEE NOTE 1)
REFERENCES
1.OVERALL SITE BASE TOPOGRAPHY WETLAND, STREAM, AND DITCH
BOUNDARIES PROVIDED BY SANBORN, BASED ON MARCH 28, 2009 AERIAL
SURVEY.
2.COORDINATE SYSTEM IS STATE PLANE GRID.
3.WELL LOCATIONS OBTAINED FROM THE WASHINGTON COUNTY LANDFILL
MONITOR WELL SURVEY REPORT, PREPARED BY SANBORN, DATED APRIL 24,
2009.
4.DATA FROM ENVIRONMENT 1 LABORATORY REPORTS DATED OCTOBER 31,
2016.
0 250'500'
LEGEND
STREAM/POND/DITCH B0UNDARY
WETLANDS BOUNDARY AREA (SEE REFERENCE 1)
GROUNDWATER FLOW DIRECTION
POTENTIOMETRIC CONTOUR
(DASHED WHERE INFERRED)
MW-1
TOC=
DTW=
GWE=
MONITORING WELL DESIGNATION
TOP OF CASING
DEPTH TO WATER
GROUNDWATER ELEVATION
PROPERTY LINE
CLOSED MSW
LANDFILL
LCID AREA
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September 2016 Groundwater Monitoring Report
Washington County Closed MSW Landfill
NC Solid Waste Permit No. 94-02-MSWLF-1980

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Appendix A
Well Logs

September 2016 Groundwater Monitoring Reports
Washington County Closed MSW Landfill
NC Solid Waste Permit No. 94-02-MSWLF-1980

This page intentionally left blank.

Appendix B
Laboratory Analytical Reports

September 2016 Groundwater Monitoring Reports
Washington County Closed MSW Landfill
NC Solid Waste Permit No. 94-02-MSWLF-1980

This page intentionally left blank.
This page intentionally left blank.

Appendix C
Historical Organic Constituent Graphs

September 2016 Groundwater Monitoring Report
Washington County Closed MSW Landfill
NC Solid Waste Permit No. 94-02-MSWLF-1980

This page intentionally left blank.

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