9404_WashingtonCoCDLF_GWMR_DIN27632_20161123

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September 2016 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

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 C&D Landfill September 2016 Groundwater Monitoring Report
November 2016 Table of Contents Page i
Washington County C&D Landfill
NC Solid Waste Permit No. 94-04-CDLF-1996

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 and Laboratory Results .................................................................................... 2 
5.0 GROUNDWATER CHARACTERIZATION ...................................................................... 2 
6.0 CONCLUSIONS .......................................................................................................... 2 

FIGURE
Figure 1 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

Washington County C&D Landfill September 2016 Groundwater Monitoring Report
November 2016 Table of Contents Page

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Washington County C&D Landfill September 2016 Groundwater Monitoring Report
November 2016 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 19, 2016.

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 PROCEDURES
The sampling event, reportedly performed by Environment 1, Inc. on September 19, 2016,
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.
4.0 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 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

1 Water Quality Monitoring Plan, S&ME, August 1, 1994.

Washington County C&D Landfill September 2016 Groundwater Monitoring Report
November 2016 Page 2
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.
4.2 Laboratory Results
The inorganic constituent cobalt (CD-1 and CD-2) was reported above its GWP Standard.
Iron (CD-1, CD-2 and CD-3) and manganese (CD-1, CD-2 and CD-3) were reported above
their respective 2L standards in samples collected this event.

The indicator parameters sulfate (CD-2) and total dissolved residue (CD-2) were
reported above their 2L 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; which are not quantifiable
values. Detected constituents are presented in Table 3.
5.0 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

Groundwater flow average velocities were 5.87x10-3ft/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 1.
6.0 CONCLUSIONS
The analytical data show relatively stable groundwater quality at the Washington County C&D
Landfill. The inorganic constituents detected are potentially due to turbidity in the sample as
these constituents are generally found to be naturally occurring in the soils across North
Carolina.

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

Washington County C&D Landfill September 2016 Groundwater Monitoring Report
November 2016 Page 3
The next groundwater monitoring event is tentatively scheduled for March 2017. Results will be
reported to North Carolina Department of Environmental Quality (NCDEQ) after receipt of
laboratory analysis.

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FIGURE

September 2016 Groundwater Monitoring Report
Washington County C&D Landfill
NC Solid Waste Permit No. 94-04-CDLF-1996

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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
EXISTING COVER SOIL
BORROW AREA
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September 2016 Groundwater Sampling Report
Washington County C&D Landfill
NC Solid Waste Permit No. 94-04-CDLF-1996

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CD_tables.xlsx
Ta
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By: MG Date: 5/23/2016
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.

CD_tables.xlsx

Appendix A
Laboratory Analytical Report

September 2016 Groundwater Monitoring Report
Washington County C&D Landfill
NC Solid Waste Permit No. 94-04-CDLF-1996

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