5901_MartinCDLF_20160525_GWMReport_DIN27943

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May 2016 Groundwater Monitoring Report

Martin County Landfill Facility
NC Solid Waste Permit No. 59-01

Prepared for:

Martin County Solid Waste Management
Williamston, North Carolina

July 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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Martin County Landfill May 2016 Groundwater Monitoring Report
July 2016 Table of Contents Page i
Martin County Landfill
NC Solid Waste Permit No. 59-01

May 2016 Groundwater Monitoring Report

Table of Contents
Page

1.0 INTRODUCTION ......................................................................................................... 1 
2.0 SITE GEOLOGY ........................................................................................................... 1 
3.0 SAMPLING LOCATIONS ............................................................................................. 1 
4.0 SAMPLING PROCEDURES ......................................................................................... 1 
5.0 FIELD AND LABORATORY RESULTS .......................................................................... 2 
5.1 Field Results .............................................................................................................. 2 
5.2 Laboratory Analysis ................................................................................................... 2 
5.3 Laboratory Results .................................................................................................... 2 
5.3.1 Inorganic Constituents .................................................................................. 2 
5.3.1.1 MSW Landfill ................................................................................... 2 
5.3.1.2 C&D Landfill .................................................................................... 2 
5.3.2 Organic Constituents .................................................................................... 3 
5.3.2.1 MSW Landfill ................................................................................... 3 
5.3.2.2 C&D Landfill .................................................................................... 3 
5.3.3 Surface Water Results .................................................................................. 3 
6.0 GROUNDWATER CHARACTERIZATION ...................................................................... 3 
7.0 CONCLUSIONS .......................................................................................................... 3 

FIGURES
Figure 1 Groundwater Potentiometric Map

TABLES
Table 1 Groundwater Elevations
Table 2 Field Parameters
Table 3 Detected Inorganic Constituents
Table 4 Detected Organic Constituents

APPENDICES
Appendix A Well Logs
Appendix B Laboratory Analytical Results

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Martin County Landfill May 2016 Groundwater Monitoring Report
July 2016 Page 1
1.0 INTRODUCTION
The Martin County Landfill, currently operating under Solid Waste Permit # 59-01. The facility
includes a closed, unlined MSW landfill and an active C&D landfill that are required to perform
semi-annual groundwater monitoring under rule 15A NCAC 13B .0510 and .0544 respectively.
This report presents the results from the groundwater monitoring event performed on May 25,
2016; and includes laboratory analyses, summary tables and laboratory analytical reports.
2.0 SITE GEOLOGY
The Martin Co. Landfill is located off McCaskey Road near Williamston in the Coastal Plain
physiographic province. According to the Geologic Map of North Carolina (1985) this area is
underlain by the Yorktown Formation. The Yorktown Formation is characterized by fossiliferous
clay with varying amounts of fine-grained sand, and bluish gray shell material commonly
concentrated in lenses.
3.0 SAMPLING LOCATIONS
Samples were collected from four groundwater monitoring wells (MW-1, MW-2, MW-3 and MW-
4) associated with the closed MSW landfill and from three groundwater monitoring wells (CDW-
2R, CDW-5 and CDW-6) for the active C&D landfill. Four surface water locations (SW-1, SW-2,
SW-3 and CDSW-2) are monitored for the facility. SW-2 was not sampled this event because it
was dry. MW-1 serves as the facility background well. Available well logs and related well
construction information are presented in Appendix A.
4.0 SAMPLING PROCEDURES
Environment 1 personnel conducted the monitoring network sampling event May 25, 2016.
Reported sampling methods followed the protocol outlined in the North Carolina Water Quality
Monitoring Guidance Document for Solid Waste Facilities (NCDENR, DWM) and the Site
Groundwater Monitoring Plan1. The depth to water in each well was gauged to determine
groundwater depth then purged three to five well volumes or until dry. Water table elevations
included in Table 1.

Samples were reportedly collected by Environment 1 personnel in laboratory prepared
containers for the specified analytical procedures. Groundwater samples were properly
preserved, placed on ice, and transported to the laboratory facility (Environment 1, Inc.
Wastewater ID: 10), within the specified hold times for each analysis.

1 Water Quality Monitoring Plan, Martin County C&D Landfill, January 2012. Richardson Smith Gardner and
Associates, Inc.

Martin County Landfill May 2016 Groundwater Monitoring Report
July 2016 Page 2
5.0 FIELD AND LABORATORY RESULTS
5.1 Field Results
Field measurements for groundwater depth, pH, temperature and specific conductance
were collected for each location sampled during this monitoring event. Results are
generally consistent with previous monitoring events. Field measurements are included
in Table 2.
5.2 Laboratory Analysis
Samples were transported to the Environment 1 laboratory facility in Greenville, NC
under proper chain of custody and analyzed for Appendix I constituents VOCs using the
SWS approved methods indicated on the laboratory report. Samples related to the
closed MSW were analyzed for the Appendix I list of metals and VOCs; the active C&D
landfill samples were analyzed for Appendix I VOCs and the 8 RCRA metals. The
laboratory analytical report is included as Appendix B.
5.3 Laboratory Results
Analytical results were compared to the NCDWM Solid Waste Section Quantitation
Limits (SWSLs) 2, 15A NCAC 2L.0200 (2LStandard) and the EPA established Federal
Maximum Contaminant Limits (MCL) for groundwater samples; and the 15A NCAC 2B
Standard for Class C waters (2B Standards) for surface water samples.

Most constituents were reported either below the method detection limit (MDL) or were
laboratory identified “J-values” indicating an estimated or non-quantifiable value.
5.3.1 Inorganic Constituents
Detected inorganic constituents are presented in Table 3.
5.3.1.1 MSW Landfill
Arsenic in MW-4 was the only inorganic parameter detected above its 2L
Standard this event.
5.3.1.2 C&D Landfill
Arsenic was the only inorganic parameter reported above its 2L Standard
in the sample from CDW-2R.

2 New Guidelines for Electronic Submittal of Environmental Monitoring Data Memo, NCDENR – Solid Waste Section,
October 27, 2006

Martin County Landfill May 2016 Groundwater Monitoring Report
July 2016 Page 3
5.3.2 Organic Constituents
Detected organic parameters are presented in Table 4.
5.3.2.1 MSW Landfill
Laboratory analysis for the MSW landfill this monitoring event indicated
the organic constituents benzene and vinyl chloride were detected above
their 2L Standards in the samples collected from MW-3 and MW-4.
5.3.2.2 C&D Landfill
Tetrahydrofuran was reported above the MDL in the sample from CDW-6.
A 2L Standard has not been established for Tetrahydrofuran. No other
organics were reported detected in C&D samples collected this event.
5.3.3 Surface Water Results
No inorganic or organic parameters were reported at concentrations above their
2B Standards in facility surface water samples collected this event.
6.0 GROUNDWATER CHARACTERIZATION
A potentiometric surface map was prepared from groundwater elevation data collected during
this sampling event. The data indicates that groundwater is flowing generally to the north and
east across most of the site. Hydraulic conductivity data is not available for these wells;
therefore, groundwater velocities could not be calculated. The potentiometric surface map is
provided as Figure 1.
7.0 CONCLUSIONS
Results from this monitoring event indicate concentrations of arsenic were detected above the
2L Standard. This parameter is naturally occurring in North Carolina soils, and likely sample
turbidity influenced results to be “biased high” due to these naturally occurring constituents.
The organic constituents benzene and vinyl chloride were also detected in samples from the
MSW landfill site at concentrations similar to previous sampling events. The next groundwater
monitoring event is scheduled for November 2016. A report with laboratory analysis will be
submitted to NCDEQ in accordance with 15A NCAC 13B .0510 and .0544.

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FIGURES

May 2016 Groundwater Monitoring Report
Martin County Landfill
Solid Waste Permit No. 59-01

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CDW-2R
TOC = 47.51
DTW = 9.85
GWE = 37.66
MW-4
TOC = 50.81
DTW = 12.50
GWE = 38.31
CDW-5
TOC = 37.58
DTW = 8.38
GWE = 29.20
CDW-6
TOC = 44.41
DTW = 4.19
GWE = 40.22
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TOC = 47.51
DTW = 9.85
GWE = 37.66
MW-4
TOC = 50.81
DTW = 12.50
GWE = 38.31
MW-1
TOC = 66.96
DTW = 7.44
GWE = 59.52
MW-2
TOC = 31.88
DTW = 0.08
GWE = 31.80
MW-3
TOC = 38.01
DTW = 1.37
GWE = 36.64
CDW-5
TOC = 37.58
DTW = 8.38
GWE = 29.20
CDW-6
TOC = 44.41
DTW = 4.19
GWE = 40.22
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May 2016 Groundwater Monitoring Report
Martin County Landfill
Solid Waste Permit No. 59-01

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APPENDIX A
Well Logs

May 2016 Groundwater Monitoring Report
Martin County Landfill
Solid Waste Permit No. 59-01

This page intentionally left blank.
FIELD BOREHOLE LOG
BOREHOLE NUMBER
PROJECT NAME:
LOCATION:
DRILLING CO:
DRILLING METHOD:
FIELD PARTY:
GEOLOGIST:
DATE BEGUN: COMPLETED:
TOTAL DEPTH:
TOP OF CASING ELEV.:
Depth (ft)
Time
Date
STATIC WATER LEVEL (from TOC)
DE
P
T
H
BL
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W

C
O
U
N
T
SA
M
P
L
I
N
G

M
E
T
H
O
D
RE
C
O
V
E
R
Y
DR
I
L
L

M
E
T
H
O
D
DESCRIPTION LI
T
H
O
L
O
G
Y
WE
L
L
IN
S
T
A
L
L
A
T
I
O
N
0.0
5.0
10.0
15.0
0.0
5.0
10.0
15.0
DE
P
T
H
Smith Gardner, Inc.
14 North Boylan Avenue, Raleigh NC 27603
[phone] Page 1 of 1
GROUND ELEV.:
NORTHING:EASTING:0 0
Pe
r

6
"
Fe
e
t
In
c
h
e
s
Fe
e
t
CDW-5
AIR ROTARY
Martin County
Williamston, NC
Geologic Explorations, Inc.
Vince Federle
Madeline German
08/16/12 08/16/2012
15 feet bgs
HSA SILTY SAND: brown silty sand
SILTY SAND: light orange brown, silty sand with
some clay, moist,
SILTY SAND: light orange brown, silty sand,
moist
17.5 feet
1315
08/16/2012
stick up estimated
FIELD BOREHOLE LOG
BOREHOLE NUMBER
PROJECT NAME:
LOCATION:
DRILLING CO:
DRILLING METHOD:
FIELD PARTY:
GEOLOGIST:
DATE BEGUN: COMPLETED:
TOTAL DEPTH:
TOP OF CASING ELEV.:
Depth (ft)
Time
Date
STATIC WATER LEVEL (from TOC)
DE
P
T
H
BL
O
W

C
O
U
N
T
SA
M
P
L
I
N
G

M
E
T
H
O
D
RE
C
O
V
E
R
Y
DR
I
L
L

M
E
T
H
O
D
DESCRIPTION LI
T
H
O
L
O
G
Y
WE
L
L
IN
S
T
A
L
L
A
T
I
O
N
0.0
5.0
10.0
15.0
0.0
5.0
10.0
15.0
DE
P
T
H
Smith Gardner, Inc.
14 North Boylan Avenue, Raleigh NC 27603
[phone] Page 1 of 1
GROUND ELEV.:
NORTHING:EASTING:0 0
Pe
r

6
"
Fe
e
t
In
c
h
e
s
Fe
e
t
CDW-6
AIR ROTARY
Martin County
Williamston, NC
Geologic Explorations, Inc.
Vince Federle
Madeline German
08/16/12 08/16/2012
15 feet bgs
HSA SILTY SAND: grey brownish orange, soft, moist
SILTY SAND: light brownish orange, silty clay,
moist
SILTY SAND: grey brown, silty sand, wet
17.5 feet
1130
08/16/2012
stick up estimated
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APPENDIX B
Laboratory Analytical Results

May 2016 Groundwater Monitoring Report
Martin County Landfill
Solid Waste Permit No. 59-01

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