2906_DavidsonCounty_MSWLF_GWMReport_April16/2015.pdf

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April 2015 Semi-Annual Groundwater Monitoring Report

Davidson County Phase 2 MSW Landfill
NC Solid Waste Permit No. 29-06

Prepared for:

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

August 2015

Prepared by:

© 2015 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 Phase 2 MSW Landfill April 2015 Groundwater Monitoring Report
August 2015 Table of Contents Page i
Davidson County Phase 2 MSW Landfill
NC Solid Waste Permit No. 29-06

April 2015 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 & LABORATORY RESULTS .............................................................................. 2 
5.1 Field Results .............................................................................................................. 2 
5.2 Laboratory Analysis ................................................................................................... 2 
5.2.1 Inorganic Constituents .................................................................................. 2 
5.2.2 Organic Constituents .................................................................................... 3 
5.2.3 Surface Water Results .................................................................................. 3 
5.2.4 Leachate Analysis ......................................................................................... 3 
6.0 STATISTICAL ANALYSIS ............................................................................................ 3 
7.0 GROUNDWATER CHARACTERIZATION ...................................................................... 3 
8.0 CONCLUSIONS .......................................................................................................... 4 

FIGURE
Figure 1 Potentiometric Surface Map

TABLES
Table 1 Groundwater Elevations
Table 2 Field Parameters
Table 3 Detected Constituents
Table 4 Leachate Analytical Data
Table 5 Aquifer Conductivity and Velocity Calculations

APPENDICES
Appendix A Monitoring Well Information
Appendix B Laboratory Analytical Report
Appendix C Time vs. Concentration Graphs

Davidson County Phase 2 MSW Landfill April 2015 Groundwater Monitoring Report
August 2015 Table of Contents Page ii

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Davidson County Phase 2 MSW Landfill April 2015 Groundwater Monitoring Report
August 2015 Page 1

1.0 INTRODUCTION
Smith Gardner, Inc. (S+G) was contracted by Davidson County to perform semi-annual
groundwater monitoring at the Davidson County Phase 2 Lined MSW Landfill, permit number
29-06, as required by 15A NCAC 13B .1600. Sampling was conducted April 16, 2015. 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.
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 groundwater network for Phase 2 at Davidson County includes eleven monitoring wells
(MW-1, MW-2, MW-3S, MW-4S, MW-5, MW-6S, MW-8, MW-9 and MW-10S), two surface water
locations (SW-1 and SW-2) and one leachate sampling point (Leachate). Monitoring wells MW-
3D, MW-4D and 10D are designated as water level only locations. MW-1 serves as the
background well for this site. A trip blank was submitted for quality control purposes. Available
well logs are presented in Appendix A.

Sampling locations are shown on Figure 1.
4.0 SAMPLING PROCEDURES
Sampling procedures followed the protocols set forth in the site’s Water Quality Monitoring
Plan1 and the 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.

1 Water Quality Monitoring Plan, Davidson County, Phase 2, Areas 1 and 2, Smith Gardner, Inc. January 2013, presented in the
Permit to Construct application.

Davidson County Phase 2 MSW Landfill April 2015 Groundwater Monitoring Report
August 2015 Page 2

Environment 1, Inc. (NC Laboratory Certification # 10) provided laboratory prepared sample
containers for the specified analytical procedures. Sample collection was performed using
factory sealed teflon bailers. 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, turbidity and specific conductance were measured in the field at the
time of sampling via direct read instruments. The field parameter results are
summarized in Table 2 and remain consistent with previously reported sampling events.
5.2 Laboratory Analysis
Samples were transported to Environment 1, Inc., in Greenville, NC, a North Carolina
certified laboratory (NC Wastewater ID #10). Laboratory analysis for groundwater
included metals via EPA Test Method 200.8 and Appendix I Volatile Organic Compounds
(VOCs) via EPA Test Method 8260B. Leachate samples were also analyzed for BOD, COD,
total suspended residue, ammonia nitrogen, nitrate nitrogen, total phosphorus and
sulfate via the SWS approved method noted in the laboratory analytical report.
Analytical results were compared to the NC Division of Waste Management Solid Waste
Section Quantitation Limits (SWSLs) and 15A NCAC 2L.0200 (2LStandard) or SWS
determined groundwater protection standard (GWP). Surface water results were
compared with the NCAC 2B Standard for Class C waters (2B Standards).

Most inorganic constituents were either below the method detection limit (MDL) or were
‘‘J-values’’ indicating a non-quantifiable value, reported by the laboratory as between the
MDL and the SWSL. The laboratory results are presented in Appendix B.
5.2.1 Inorganic Constituents
Chromium (MW-1, MW-2, MW-4S and MW-10S) was the only inorganic
constituent with concentrations reported above its 2L Standard.

Two inorganic constituents cobalt (MW-1, MW-4S and MW-6S), and vanadium
(MW-1, MW-2, MW-4S, MW-6S, MW-9 and MW-10S) had concentrations in
samples above their respective GWP standards.

Davidson County Phase 2 MSW Landfill April 2015 Groundwater Monitoring Report
August 2015 Page 3

These inorganic constituents are naturally occurring in North Carolina and may
also have been influenced by high sample turbidity. A summary of inorganic
laboratory results is presented in Table 3.

5.2.2 Organic Constituents
No organic constituents were detected in samples above their MDL values for the
April monitoring event.
5.2.3 Surface Water Results
No inorganic or organic constituents were detected above 2B Standards in
surface water samples. Surface water results are shown in Table 3.
5.2.4 Leachate Analysis
Leachate samples were collected from the leachate collection system. A
summary of constituents detected in the leachate is included as Table 4.
6.0 STATISTICAL ANALYSIS
No statistical analyses were performed on the analytical data based on the latest version of 15A
NCAC 13B.1632 and .1633 effective April 1, 2011. Time vs. concentration graphs are included in
Appendix C.
7.0 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 Phase 2 MSW Landfill ranged from
0.0038 feet/day (MW-6S) to 0.252 feet/day (MW-9) and averaging 0.0938 feet/day. Calculations
are included in Table 5. Groundwater elevations indicate the flow direction is generally
northwest across the site; which is consistent with historically reported ground water flow
patterns. The potentiometric surface map is included as Figure 1.

Davidson County Phase 2 MSW Landfill April 2015 Groundwater Monitoring Report
August 2015 Page 4

8.0 CONCLUSIONS
Laboratory results indicate the water quality at the Davidson County Phase 2 Landfill is
generally consistent with reported historical detections. Inorganic constituent detections are
likely due to natural occurrence and their presence in the soil and rock formations, not impact
from the landfill. In general, detected groundwater concentrations at the site have remained
stable. The next groundwater monitoring event will be performed in October 2015; results will
be reported to NCDENR in accordance with 15A NCAC 13B.1600 et seq.

FIGURES

April 2015 Groundwater Monitoring Report
Davidson County Phase 2 MSW Landfill
NC Solid Waste Permit No. 29-06

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April 2015 Groundwater Monitoring Report
Davidson County Phase 2 MSW Landfill
Solid Waste Permit No. 29-06

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Table 4
Leachate Analytical Data
Davidson County Phase 2 Landfill
April 16, 2015
By: LMH
Date: 06/30/2015
Parameter Unit Leachate
BOD mg/l 734
COD mg/l 1000
Total Suspended Residue mg/l 81
Ammonia Nitrogen as N mg/l 42.5
Total Phosphorus mg/l 2.2
Sulfate mg/l 19.8 J
Antimony ug/l 3.3 J
Arsenic ug/l 8 J
Barium ug/l 158
Beryllium ug/l 0.09 J
Cadmium ug/l 1
Cobalt ug/l 12
Total Chromium ug/l 25
Copper ug/l 52
Lead ug/l 2.2 J
Nickel ug/l 96
Selenium ug/l 7 J
Silver ug/l 0.16 J
Vanadium ug/l 29
Zinc ug/l 2222
1,1-Dichloroethane ug/l 2.50 J
1,2-Dichloroethane ug/l 4.5
1,2-Dichloropropane ug/l 12.7
1,4-Dichlorobenzene ug/l 4.5
2-Butanone ug/l 948
2-Hexanone ug/l 42.10 J
Acetone ug/l 862
Benzene ug/l 13.2
Bromodichloromethane ug/l 24.3
Chlorobenzene ug/l 0.60 J
Chloroethane ug/l 2.70 J
Cis-1,2-Dichloroethene ug/l 1.50 J
Ethylbenzene ug/l 13.9
Methylene Chloride ug/l 2.3
Styrene ug/l 0.90 J
trans-1,2-Dichloroethene ug/l 1.80 J
Trichloroethene ug/l 0.80 J
Vinyl Chloride ug/l 1.9
Xylenes ug/l 32.6
Note:J-values are laboratory defined between the SWSL and MDL.
Z:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Davidson\4-15 dav gw sampling tables
This page intentionally left blank.
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Appendix A
Monitoring Well Information
April 2015 – Groundwater Monitoring Report
Davidson County Phase 2 MSW Landfill
Solid Waste Permit No. 29-06

This page intentionally left blank.

FIELD BOREHOLE LOG
BOREHOLE NUMBER
PROJECT NAME:
LOACATION:
DRILLING CO:
DRILLING METHOD:
FIELD PARTY:
GEOLOGIST:
DATE BEGUN: COMPLETED:
TOTAL DEPTH:
GROUND SURFACE ELEVATION:
Depth (ft)
Time
Date
STATIC WATER LEVEL (BLS)
DE
P
T
H
BL
O
W

C
O
U
N
T
SA
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P
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H
O
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R
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DR
I
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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
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
20.0
21.0
22.0
23.0
24.0
25.0
26.0
27.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
20.0
21.0
22.0
23.0
24.0
25.0
26.0
27.0
DE
P
T
H
G. N. Richardson & Associates, Inc.
14 North Boylan Avenue, Raleigh NC 27603
[phone] Page 1 of 1
TOP OF CASING ELEVATION:
PZ-37
HSA
Davidson County - Phase 2
Lexington, NC
Engineering Tectonics, P.A.
R. Barron
J. Smyth
9/21/04 9/21/04
27
SS
SS
SS
SS
SS
18"
10"
8"
3"
2"
HSA SILTY SAND: Dry to moist, tan and black, silty sand
granitic sarprolite with Mn staining.
CLAYEY SANDY GRAVEL: Moist red brown clayey
sandy gravel sarprolite.
CLAYEY GRAVEL: Wet clayey gravel saprolite with
large quartz grains. Boring terminated at 27 feet below
grade.
11,21,37
6,9,15
4,8,28
50/3
50/2
19
2 pm
9/21/04
16.98
10/12/04
4:15
FIELD BOREHOLE LOG
BOREHOLE NUMBER
PROJECT NAME:
LOACATION:
DRILLING CO:
DRILLING METHOD:
FIELD PARTY:
GEOLOGIST:
DATE BEGUN: COMPLETED:
TOTAL DEPTH:
GROUND SURFACE ELEVATION:
Depth (ft)
Time
Date
STATIC WATER LEVEL (BLS)
DE
P
T
H
BL
O
W

C
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N
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DESCRIPTION LI
T
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O
G
Y
WE
L
L
IN
S
T
A
L
L
A
T
I
O
N
0.0
1.0
2.0
3.0
4.0
5.06.07.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.018.019.020.0
21.0
22.0
23.0
24.0
25.0
26.0
27.0
28.0
29.0
30.031.032.033.0
34.0
35.0
36.0
37.0
38.0
39.0
40.0
41.0
42.0
43.044.0
0.0
1.0
2.0
3.0
4.0
5.06.07.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.018.019.020.0
21.0
22.0
23.0
24.0
25.0
26.0
27.0
28.0
29.0
30.031.032.033.0
34.0
35.0
36.0
37.0
38.0
39.0
40.0
41.0
42.0
43.044.0
DE
P
T
H
G. N. Richardson & Associates, Inc.
14 North Boylan Avenue, Raleigh NC 27603
[phone] Page 1 of 1
TOP OF CASING ELEVATION:
PZ-37d
HSA
Davidson County - Phase 2
Lexington, NC
Engineering Tectonics, P.A.
R. Barron
J. Smyth
9/21/04 10/14/06
44
SS
SS
SS
SS
SS
18"
10"
8"
3"
2"
HSA
AH/RC
SILTY SAND: Dry to moist, tan and black, silty sand
granitic sarprolite with Mn staining.
CLAYEY SANDY GRAVEL: Moist red brown clayey
sandy gravel sarprolite.
CLAYEY GRAVEL: Wet clayey gravel saprolite with
large quartz grains. AR at 30'. Air hammer to 34' to
set outer casing in rock.
DIABASE: Rock cored from 34' to 44' REC=95%,
RQD=39%. Weathered diabase. Boring terminated at
44 feet.
11,21,37
6,9,15
4,8,28
50/3
50/2

Appendix B
Laboratory Analytical Report
April 2015 Groundwater Monitoring Report
Davidson County Phase 2 MSW Landfill
NC Solid Waste Permit No. 29-06

This page intentionally left blank.

Appendix C
Time vs. Concentration Graphs
April 2015 Groundwater Monitoring Report
Davidson County Phase 2 MSW Landfill
NC Solid Waste Permit No. 29-06

This page intentionally left blank.

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