2902_DavidsonHollyGrove_GWMR_DIN28292_20160921

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September 2016 Semi-Annual Groundwater Monitoring Report

Davidson County Closed Holly Grove Landfill
NC Solid Waste Permit No. 29-02

Prepared for:

Davidson County Integrated Solid Waste
1242 Old Highway 29
Thomasville, North Carolina 27360-0024

December 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 upon by the client and Smith Gardner, Inc.

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Davidson County Holly Grove Landfill September 2016 Groundwater Monitoring Report
December 2016 Table of Contents Page i
Davidson County Holly Grove Landfill
NC Solid Waste Permit No. 29-02

September 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 ......................................................................................... 2 
5.0 FIELD & LABORATORY RESULTS .............................................................................. 2 
5.1 Field Results .............................................................................................................. 2 
5.2 Laboratory Analysis ................................................................................................... 2 
5.2.1 Inorganic Constituents .................................................................................. 3 
5.2.2 Organic Constituents .................................................................................... 3 
5.2.3 Surface Water Results .................................................................................. 3 
6.0 GROUNDWATER CHARACTERIZATION ...................................................................... 3 
7.0 CONCLUSIONS .......................................................................................................... 4 

FIGURE
Figure 1 Potentiometric Surface Map

TABLES
Table 1 Groundwater Elevations
Table 2 Field Parameters
Table 3 Detected Inorganic Parameters
Table 4 Detected Organic Parameters
Table 5 Groundwater Velocity Calculations

APPENDICES
Appendix A Well Logs
Appendix B Laboratory Analytical Report

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Davidson County Holly Grove Landfill September 2016 Groundwater Monitoring Report
December 2016 Page 1
1.0 INTRODUCTION
Smith Gardner, Inc. (S+G) was contracted by Davidson County to perform their semi-annual
groundwater monitoring at the Davidson County Closed Holly Grove Landfill, permit number 29-
02, as required by 15A NCAC 13B .0500. Sampling was conducted September 19-20, 2016. This
report summarizes the event sampling procedures, field and laboratory results and
groundwater characterization as required by NC Solid Waste Regulations. Summary tables, a
potentiometric map and the laboratory analytical report are also included.

Three landfills are currently monitored under permit 29-02, as the Holly Grove Landfill, due to
their waste margins close proximity to one another. Areas 1 and 2, located in the Holly Grove
Landfill, were unlined municipal solid waste facilities owned and operated by Davidson County
Integrated Solid Waste. The third area, the Scarlett Landfill located west of Areas 1 and 2, is a
private landfill originally owned and operated by Mr. Scarlett, then owned by Ms. Virginia White
who sold the Scarlett property to Hale Artificier Inc. in 2001; it is currently used to house
storage containers.
2.0 SITE GEOLOGY
The Davidson County Landfill facility is located in the Piedmont Physiographic Province of North
Carolina approximately three and a half miles northeast of the City of Lexington, NC. The
Geologic Map of North Carolina (USGS, 1985) indicates that the site lies at the western margin
of the Carolina Slate Belt; an area of predominantly volcanic and sedimentary rocks of Late
Proterozoic to Cambrian age that have been metamorphosed and intruded by numerous
igneous plutons. The boundary zone between the Carolina Slate Belt and the adjacent Charlotte
Belt is known as the Gold Hill/Silver Hill shear zone. The site vicinity is underlain by volcanic
rocks from the Flat Swamp Member of the Cid Formation and metavolcanic rocks of the
Battleground Formation.
3.0 SAMPLING LOCATIONS
The Holly Grove groundwater monitoring network includes sixteen monitoring wells (MW-1A,
MW-2, MW-3A, MW-4, MW-5, MW-6, MW-8, MW-9, MW-10, MW-11, MW-12, MW-13, MW-14,
MW-15, MW-16 and MW-17) and three surface water locations (SW-1, SW-2 and SW-3). SW-3
was not sampled this event because it was dry. A trip blank (TB) was also submitted for quality
control purposes. Available well records are provided in Appendix A.

The background well for the Holly Grove site is also the background well for the Phase 1 Lined
Davidson County Landfill (Permit 29-06). Since that well is located in the Phase 1 area, it was
sampled and laboratory analysis is included with the Phase 1 wells (Environment 1 Report
10/31/16, Client ID# 6038). The background well was recorded in the Phase 1 report as MW-1S
and that data is included in the Phase 1 Lined Davidson County Landfill’s respective
groundwater monitoring report.

Davidson County Holly Grove Landfill September 2016 Groundwater Monitoring Report
December 2016 Page 2
A map illustrating the sampling locations is provided as Figure 1.
4.0 SAMPLING PROCEDURES
Sampling procedures followed the protocols set forth in North Carolina Water Quality
Monitoring Guidance Document for Solid Waste Facilities (North Carolina Department of
Environment and Natural Resources, Division of Waste Management). S+G personnel gauged
each well to determine groundwater depth and purged three to five well volumes or until dry.
Groundwater elevations are provided in Table 1.

Environment 1, Inc. (NC Laboratory Certification #10) provided laboratory prepared sample
containers. Groundwater samples were properly preserved, placed on ice and transported to
the laboratory facility within the specified hold times for each analysis.

Sampling wells and locations were inspected and found to be in good condition and free of
obstructions.
5.0 FIELD & LABORATORY RESULTS
5.1 Field Results
Temperature, pH, specific conductance and turbidity were measured in the field at the
time of sampling via direct read instruments. The field parameter results are
summarized in Table 2 and have remained consistent with previously reported sampling
events.
5.2 Laboratory Analysis
Samples were transported to Environment 1, Inc., in Greenville, NC for analysis.
Laboratory analysis included metals via EPA Test Method 200.8 and Appendix I Volatile
Organic Compounds (VOCs) via EPA Test Method 8260B. Analytical results were
compared to the NC DWM Solid Waste Section Quantitation Limits (SWSLs), 15A NCAC
2L.0200 (2LStandard), Groundwater Protection (GWP) Standards and Federal Maximum
Contaminant Limits (MCL). Surface water results were compared with the NCAC 2B
Standard for Class C waters (2B Standard).

The laboratory defines constituent concentrations between the MDL and SWS as
estimated values and notes them with a “J” qualifier. This event, most constituents
were reported either below the method detection limit (MDL) or were reported as “J-
values” indicating a non-quantifiable value. The laboratory analysis is presented in
Appendix B.

Davidson County Holly Grove Landfill September 2016 Groundwater Monitoring Report
December 2016 Page 3
5.2.1 Inorganic Constituents
Total chromium (MW-15) was the only inorganic constituent reported above its
2L Standard this event. Arsenic (MW-13) and cadmium (MW-11) were reported at
concentrations equal to their 2L Standard in samples collected this event. Cobalt
(MW-10, MW-13 and MW-15) and vanadium (MW-15) were detected at
concentrations above their GWP Standards this event. Inorganic detections are
provided on Table 3.
5.2.2 Organic Constituents
The following six organic constituents were reported at concentrations above
their 2L Standards:

 1,1-Dichloroethane (MW-1A, MW-6, MW-8, and MW-17);
 1,2-Dichloroethane (MW-1A);
 1,2-Dichloropropane (MW-1A);
 1,4-Dichlorobenzene (MW-9, MW-12 and MW-13);
 Benzene (MW-1A, MW-8, MW-9 and MW-13);
 Vinyl Chloride (MW-1A, and MW-12).

Organic detections are provided on Table 4.
5.2.3 Surface Water Results
No inorganic or organic constituents were detected in surface water samples
above their 2B Standards.
6.0 GROUNDWATER CHARACTERIZATION
A potentiometric surface map was prepared from groundwater data from this sampling event.
Groundwater flow velocities for this sampling event were calculated for monitoring wells using
the equation:
V = Ki/n
where: K = hydraulic conductivity
i = groundwater gradient
n = porosity

Groundwater velocities in the uppermost aquifer at the Holly Grove Landfill ranged from 0.079
feet/day (MW-2) to 1.569 feet/day (MW-3A) and averaging 0.729 feet/day. Calculations are
included in Table 5. Flow direction is generally southwest across the site; which is consistent
with historically reported groundwater flow patterns. The potentiometric surface map for this
monitoring event is included as Figure 1.

Davidson County Holly Grove Landfill September 2016 Groundwater Monitoring Report
December 2016 Page 4
7.0 CONCLUSIONS
Overall reported detections remain consistent with historically reported results. Monitoring
event results indicate detections of both inorganic and organic constituents above the 2L
Standards. The inorganic detections can be attributed to natural occurrence in the soils in this
area of North Carolina and turbidity; and are not due to landfill impact. Organic constituent
detections are consistent with historical results. Surface water samples indicated no 2B
exceedances for this event indicating surface waters remain un-impacted.

The next groundwater monitoring event is tentatively scheduled for March 2017. Sampling
results will be reported to NCDEQ with laboratory analysis.

FIGURES

September 2016 Groundwater Monitoring Report
Davidson County Holly Grove Landfill
NC Solid Waste Permit No. 29-02

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MW-11
TOC= 680.07
DTW= 25.50
GWE= 654.57
MW-13
TOC= 671.31
DTW= 14.59
GWE= 656.72
MW-12
TOC= 671.48
DTW= 17.11
GWE= 654.37
MW-2
TOC= 665.81
DTW= 6.34
GWE= 659.47
MW-3A
TOC= 662.49
DTW= 8.00
GWE= 654.49
MW-14
TOC= 666.04
DTW= 13.02
GWE= 653.02
MW-5
TOC= 664.29
DTW= 11.39
GWE= 652.90
MW-15TOC= 697.33
DTW= 17.14
GWE= 680.19
MW-17
TOC= 737.99
DTW= 12.86
GWE= 725.13
MW-1A
TOC= 781.39
DTW= 31.12
GWE= 750.27
MW-6*
TOC= 781.25
DTW= 62.81
GWE= 718.44
MW-16
TOC= 757.54
DTW= 17.42
GWE= 740.12
MW-8
TOC= 737.60
DTW= 15.70
GWE= 721.90
MW-10
TOC= 678.24
DTW= 6.00
GWE= 672.24
SW-1-HG
SW-2-HG
MW-9
TOC= 719.03
DTW= 15.19
GWE= 703.84
HOLLY GROVE
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September 2016 Groundwater Monitoring Report
Davidson County Holly Grove Landfill
Solid Waste Permit No. 29-02

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x

Appendix A
Well Logs

September 2016 Groundwater Monitoring Report
Davidson County Holly Grove Landfill
NC Solid Waste Permit No. 29-02

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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
20.0
25.0
30.0
35.0
40.0
45.0
50.0
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
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
MW-16
HSA/AH
Davidson County - Holly Grove Landfills
Lexington, NC
Engineering Tectonics, P.A.
R. Barron
P. May
12/7/00 1/11/00
50
SS
SS
6"
0"
HSA
AH
PWR: Dry tan-orange partially weathered rock w/
white mottles throughout.
DIORITE: Competent diorite.
DIORITE: Competent diorite. Boring terminated at
50'.
26,50/5"
50/0"
38.0
16:00
1/11/00
41.69
1/24/01
10:00
NA
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
20.0
25.0
30.0
35.0
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
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
MW-17
HSA/AH
Davidson County - Holly Grove Landfills
Lexington, NC
Engineering Tectonics, P.A.
R. Barron
P. May
12/7/00 12/8/00
39.5
SS
SS
SS
12"
10"
0"
HSA
AH
SILTY SAND: Dry tan-orange fine silty sand w/
iron & manganese mottles
CLAYEY SILTY SAND: Slightly moist brown
clayey fine silty sand with iron & manganese
mottles and some light gray clay seams.
DIORITE: Competent diorite.
DIORITE: Competent diorite. Boring terminated at
39.5'.
17,34,37
11,13,17
50/0"
38.5
16:00
12/7/00
22.5
12/8/00
8:00
NA

Appendix B
Laboratory Analytical Report

September 2016 Groundwater Monitoring Report
Davidson County Holly Grove Landfill
NC Solid Waste Permit No. 29-02

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