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September 2017 Semi-Annual Groundwater Monitoring Report
Davidson County Construction and Demolition Debris Landfill
NC Solid Waste Permit No. 29-06
Prepared for:
Davidson County Integrated Solid Waste
1242 Old Highway 29
Thomasville, North Carolina 27360-0024
January 2018
Prepared by:
© 2018 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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September 2017 Semi-Annual Groundwater Monitoring Report
Davidson County Construction and Demolition Debris Landfill
NC Solid Waste Permit No. 29-06
Prepared For:
Davidson County Integrated Solid Waste
Thomasville, North Carolina 27360-0024
S+G Project No. DAVDCO 17-5
Madeline German P.G.
Project Geologist
Joan A. Smyth, P.G.
Senior Hydrogeologist
January 2018
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1/10/2018
1/10/2018
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Davidson County C&D Landfill September 2017 Groundwater Monitoring Report
January 2018 Table of Contents Page i
Davidson County Construction and Demolition Debris Landfill
NC Solid Waste Permit No. 29-06
September 2017 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
6.0 GROUNDWATER CHARACTERIZATION ...................................................................... 3
7.0 CONCLUSIONS .......................................................................................................... 3
FIGURE
Figure 1 Site Map
Figure 2 Potentiometric Surface Map
TABLES
Table 1 Groundwater Elevations
Table 2 Field Parameters
Table 3 Detected Inorganic Parameters
Table 4 Detected Organic Parameters
APPENDICES
Appendix A Monitoring Well Information
Appendix B Laboratory Analytical Report
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Davidson County C&D Landfill September 2017 Groundwater Monitoring Report
January 2018 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 Construction and Demolition (C&D) Debris
Landfill, permit number 29-06, as required by 15A NCAC 13B .0500. Sampling was conducted
September 18-21, 2017. 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. This region also has numerous intrusions of metagabbro and
metabasalt dikes and conformable sheets. This metagabbro typically crops out as round
residual boulders that show no foliation except in the Gold Hill/Silver Hill shear zone.
The encountered lithology includes sandy silt and partially weathered rock. For this report
partially weathered rock is defined as soils with a standard penetration test blow count of 100+
blows per foot.
3.0 SAMPLING LOCATIONS
Groundwater sampling at the Davidson County C&D Landfill was performed at five down-
gradient groundwater monitoring well locations (CDMW-2, CDMW-3, CDMW-5, CDMW-6 and
CDMW-7). Monitoring well MW-1S (associated with the Phase 1 lined landfill) is used as the
upgradient well for this site. No surface water monitoring locations have been established for
this site. CDMW-2 was damaged and unable to be sampled this event. A trip blank (TB) sample
was also submitted for quality control purposes.
Sampling locations are shown on Figure 1. Boring logs and construction records are provided
in Appendix A.
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Davidson County C&D Landfill September 2017 Groundwater Monitoring Report
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4.0 SAMPLING PROCEDURES
Sampling procedures followed the protocols set forth in the site’s Sampling and Analysis 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. Field measurements for pH, specific conductivity,
turbidity and temperature were recorded at each well. Groundwater elevations are provided in
Table 1.
Environment 1, Inc. (NC Laboratory Certification #10) provided laboratory prepared sample
containers for the specified analytical procedures. 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 C&D metals via EPA Test Methods 200.7, 200.8 and 245.1,
appendix I Volatile Organic Compounds (VOCs) via EPA Test Method 8260B and additional
C&D parameters for alkalinity, chloride, total dissolved solids and sulfate via SWS
approved methods listed in the laboratory report. Analytical results were compared to
the NC DWM Solid Waste Section Quantitation Limits (SWSLs), 15A NCAC 2L.0200 (2L
Standard) and Federal Maximum Contaminant Limits (MCLs). The laboratory report is
presented in Appendix B.
1 Davidson County C&D Landfill Water Quality Monitoring Plan. Richardson Smith Gardner and Associates, April 2011.
2 New Guidelines for electronic submittal of environmental monitoring data memo, NCDENR DWM, Solid Waste Section, October 27,
2006.
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Davidson County C&D Landfill September 2017 Groundwater Monitoring Report
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5.2.1 Inorganic Constituents
Iron (CDMW-3, CDMW-6, and CDMW-7) was the only inorganic constituent
detected at concentrations above its 2L Standard in samples collected this event.
Two constituents were detected at concentrations above their GWP standards in
samples collected this event.
Cobalt (CDMW-3)
Vanadium (CDMW-3, CDMW-5, CDMW-6, and CDMW-7)
The indicator parameter total dissolved residue was also reported at
concentrations above its 2L standard (CDMW-3 and CDMW-7). This parameter is
similar to turbidity and indicates the presence of suspended solids which may
bias inorganic results high.
5.2.2 Organic Constituents
No organic constituents were detected above the established 2L Standard in
groundwater samples collected for the September 2017 sampling event.
Tetrahydrofuran was reported at concentrations above its MDL (CDMW-3,
CDMW-6, and CDMW-7). There is no established 2L standard for this
constituent.
6.0 GROUNDWATER CHARACTERIZATION
A potentiometric surface map was prepared from groundwater data from this sampling event.
Groundwater at the C&D landfill flows in a generally northern direction. The potentiometric
surface for the landfill property is shown on Figure 2.
7.0 CONCLUSIONS
C&D landfill analytical results indicate that iron, cobalt and vanadium were detected above their
standards in groundwater samples collected this event. These detections are likely due to
variations in these naturally occurring constituents and are not indicative of groundwater
impact from the landfill. The next groundwater monitoring event is scheduled for March 2018.
A monitoring report will be submitted to DEQ with analytical data and analysis following that
event.
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FIGURES
September 2017 Groundwater Monitoring Report
Davidson County C&D Landfill
NC Solid Waste Permit No. 29-06
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LINED MSW LANDFILL
(PERMIT 29-06)
MAINTENANCE BUILDING
SCALES/SCALEHOUSE
C&D LANDFILL (INACTIVE)
200' EXISTING RAILROAD
RIGHT OF WAY
(NC RAILROAD)
LEACHATE
STORAGE POND
CLOSED PHASE 1
MSW LANDFILL
PROPERTY LINE (TYP.)
DUKE POWER
TRANSMISSION LINE
RIGHT OF WAY
BORROW &
STOCKPILE
AREA
ACTIVE MSW LANDFILL
(PHASES 2 AREA 1)G:\CAD\Davidson\Davdco 17-7\sheets\DAVDCO-B0853.dwg - 12/1/2017 3:42 PMSMITH14 N. Boylan Avenue, Raleigh NC 27603NC LIC. NO. F-1370 (ENGINEERING)919.828.0577GARDNER+DRAWN:APPROVED:PROJECT NO:SCALE:FILENAME:DATE:FIGURE NO.PREPARED BY:PREPARED FOR:© 2017 Smith Gardner, Inc.SITE MAPSEPTEMBER 2017CLOSED PHASE 1 AND C&DDAVIDSON COUNTY, NCJ.A.L.M.M.G.AS SHOWN1Dec 2017DAVDCO 17-7DAVDCO-B0853DocuSign Envelope ID: 8BB0D122-C022-4F9D-A196-A2263D188DEA
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MW-1S
TOC= 736.20
DTW= 55.65
GWE= 680.55
MW-1D
CDMW-2
CDMW-3
TOC= 685.00
DTW= 14.71
GWE= 670.29
*MW-2TOC= 708.29
DTW= DRY
MW-3
TOC= 666.72
DTW= 13.43
GWE= 653.29
MW-4
TOC= 673.68
DTW= 20.07
GWE= 653.61
MW-5
TOC= 678.23
DTW= 26.35
GWE= 651.88
MW-6
TOC= 694.13
DTW= 35.25
GWE= 658.88
MW-7S
TOC= 663.39
DTW= 9.62
GWE= 653.77
MW-7D
TOC= 663.59
DTW= 9.58
GWE= 654.01
MW-8
TOC= 661.16
DTW= 9.32
GWE= 651.84
MW-9A
TOC= 692.60
DTW= 29.55
GWE= 663.05
MW-10
TOC= 671.64
DTW= 25.20
GWE= 646.44
MW-11
TOC= 692.10
DTW= 29.23
GWE= 662.87
MW-12
TOC= 711.66
DTW= 50.02
GWE= 661.64
SW-3-HG
SW-1
SW-2
CDMW-5
TOC= 699.80
DTW= 26.44
GWE= 673.36
CDMW-6
TOC= 692.27
DTW= 16.11
GWE= 676.16
CDMW-7
TOC= 701.11
DTW= 34.50
GWE= 666.61
LINED MSW LANDFILL
(PERMIT 29-06)
MW-2
CDMW-5
SW-2
MAINTENANCE BUILDING
SCALES/SCALEHOUSE
C&D LANDFILL (INACTIVE)
200' EXISTING RAILROAD
RIGHT OF WAY
(NC RAILROAD)
LEACHATE
STORAGE POND
CLOSED PHASE 1
MSW LANDFILL
PROPERTY LINE (TYP.)
DUKE POWER
TRANSMISSION LINE
RIGHT OF WAY
BORROW &
STOCKPILE
AREA
ACTIVE MSW LANDFILL
(PHASES 2 AREA 1)
TOC
DTW
GWE
G:\CAD\Davidson\Davdco 17-7\sheets\DAVDCO-B0853.dwg - 12/1/2017 3:07 PMSMITH14 N. Boylan Avenue, Raleigh NC 27603NC LIC. NO. F-1370 (ENGINEERING)919.828.0577GARDNER+DRAWN:APPROVED:PROJECT NO:SCALE:FILENAME:DATE:FIGURE NO.PREPARED BY:PREPARED FOR:© 2017 Smith Gardner, Inc.POTENTIOMETRIC SURFACE MAPSEPTEMBER 2017CLOSED PHASE 1 AND C&DDAVIDSON COUNTY, NCJ.A.L.M.M.G.AS SHOWN2Dec 2017DAVDCO 17-7DAVDCO-B0853DocuSign Envelope ID: 8BB0D122-C022-4F9D-A196-A2263D188DEA
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TABLES
September 2017 Groundwater Monitoring Report
Davidson County C&D Landfill
Solid Waste Permit No. 29-06
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Table 1Groundwater ElevationsDavidson County C&D LandfillSeptember 18-21, 2017By: WWDate: 10/5/2017WellWell Installation DateLatitude LongitudeWell Diameter (inches)Total Well Depth (ft bgs)Ground Surface Elevation (ft amsl)TOC Elevation (ft amsl)Depth to Water* (ft)Groundwater Elevation (ft amsl)Screen Interval (ft bgs)Screen GeologyCDMW-2 7/16/1998 35.84298 80.17524 2.0 51.0 702.27 704.80brokenbroken 41-51 graniteCDMW-3 12/5/2000 35.84273 80.17615 2.0 30.0 681.02 685.0014.71670.29 17-27 clayey sand & PWRCDMW-5 1/30/2006 35.84212 80.17707 2.0 50.1 696.79 699.8026.44673.36 32-47 graniteCDMW-6 11/15/2010 35.84076 80.17423 2.0 26.3 689.84 692.2716.11676.16 13-23 PWRCDMW-7 11/15/2010 35.84128 80.17424 2.0 47.8 698.56 701.1134.50666.61 35-45 silt & graniteNOTE: Survey data reported by Michael Green and Associates.amsl = above mean sea levelbgs = below ground surfaceWell construction information from well logs (provided in Appendix A)* Depth to water measured from TOCCDMW-2 was damaged by heavy equipment and could not be sampled this event.H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Davidson\25. Davidson 9-17\Sep-17 dav gw sampling tables.xlsxDocuSign Envelope ID: 8BB0D122-C022-4F9D-A196-A2263D188DEA
Table 2Field ParametersDavidon County C&D LandfillSeptember 18-21, 2017By: WWDate: 10/5/2017pH Conductivity Temperature(Std Units) (uhmos/cm) (Celsius)CDMW-3 6.24 319 20.88 55.4CDMW-5 6.11 411 19.19 27.1CDMW-6 5.62 581 18.64 23.9CDMW-7 6.44 633 17.26 14.4NOTE:Data Collected by S+G personnel.CDMW-2 was damaged and could not be sampled this event.Turbidity (NTU)WellField parameters for background well MW-1S, associated with the Phase 1 landfill, are presented in the Phase 1 report.H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Davidson\25. Davidson 9-17\Sep-17 dav gw sampling tables.xlsxDocuSign Envelope ID: 8BB0D122-C022-4F9D-A196-A2263D188DEA
Table 3Detected Inorganic ParametersDavidson County C&D LandfillSeptember 18-21, 2017By:MGDate:1/3/18Constituent MDL SWSL 2L or GWPMCLCDMW-3 CDMW-5 CDMW-6 CDMW-7total alkalinity (mg CaCO3/l) 1NENE NE342 75 48 187chloride (mg/l) 5 NE 250 250** 66 41 35 38total dissolved residue (mg/l)1 NE 500 500**793293 445533sulfate (mg/l) 1.04 250 250 250** 139 J 47 J 156 J 133 Jarsenic 0.07 10 10 10 0.76 J 0.18 J 0.23 J 0.14 Jbarium 0.07 100 700 2000 346 50.5 J 7.5 J 12.3 Jberyllium 0.07 1 4* 4 0.19 J <0.07 0.08 J <0.07cadmium 0.08 1 2 5 0.09 J <0.08 <0.08 <0.08cobalt 0.24 10 1* NE4 J0.44 J 0.39 J 0.63 Jtotal chromium 0.08 10 10 100 6.3 J <0.08 <0.08 0.54 Jcopper0.09 10 1000 1300 54 1.5 J 1.1 J 6.8 Jiron 13.27 300 300 3001462584 J504 2253manganese 1.28 50 50 50 371 24 J 143 38 Jlead 0.08 10 15 15 3 J <0.08 0.24 J 0.8 Jnickel 0.08 50 100 NE 9.8 J 2.4 J 8.9 J 3.3 Jselenium 0.51 10 20 50 2.4 J 0.58 J 0.94 J <0.51silver0.20 10 20 100 0.28 J <0.2 <0.2 <0.2vanadium 0.24 25 0.3* NE49 3 J 3.6 J 7.5 Jzinc 0.66 10 1000 5000 35 4 J 3.3 J 5.9 JNOTE:MDL -Method Detection LimitSWSL -Solid Waste Section Quantitation Limits2L-Groundwater Standards (15A NCAC 2L 0200)GWP-SWS Groundwater Protection Standards (noted by *)MCL - Federal Maximum Contaminant Limit** - National Secondary Drinking Water StandardBOLD-Detection above 2L or GWP StandardJ-Laboratory defined between MDL and SWSL<MDL -Not detected at or above MDLNE - Standard Not EstablishedTable units are presented in ug/l unless otherwise noted.Lab data for background well MW-1S, associated with the Phase 1 landfill, are presented in the Phase 1 reportMW-1S, associated with Phase 1, is the bacground well for the C&DCDMW-2 was damaged and unable to be sampled this event.Lab data analysis by Environment 1, Inc. report dated 11/1/2017, Client ID#6050.H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Davidson\25. Davidson 9-17\Sep-17 dav gw sampling tables.xlsxDocuSign Envelope ID: 8BB0D122-C022-4F9D-A196-A2263D188DEA
Table 4Detected Organic ParametersDavidson County C&D LandfillSeptember 18-21, 2017By: MMDate: 1/3/2018Constituent MDL SWSL 2L MCL CDMW-3 CDMW-6 CDMW-71,1-dichloroethane 0.20 5 6 NE 0.6 J <0.2 <0.2benzene 0.24 1 1 5 0.4 J <0.24 <0.24tetrahydrofuran 0.39 NE NE NE 55.2 2 2.9NOTE:MDL -Method Detection LimitSWSL -Solid Waste Section Quantitation Limits2L-Groundwater Standards (15A NCAC 2L 0200)MCL - Federal Maximum Contaminant LimitBOLD-Detection above 2L StandardJ-Laboratory defined between MDL and SWSLNE -Standard Not EstablishedTable units are presented in ug/l.CDMW-2 was damaged and unable to be sampled this event.MW-1S, associated with Phase 1, is the bacground well for the C&DLab data analysis by Environment 1, Inc. report dated 11/1/2017, Client ID#6050.H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Davidson\25. Davidson 9-17\Sep-17 dav gw sampling tables.xlsxDocuSign Envelope ID: 8BB0D122-C022-4F9D-A196-A2263D188DEA
Appendix A
Monitoring Well Information
September 2017 Groundwater Monitoring Report
Davidson County C&D Landfill
NC Solid Waste Permit No. 29-06
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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)DEPTHBLOW COUNTSAMPLING METHODRECOVERYDRILL METHODDESCRIPTION LITHOLOGYWELLINSTALLATION0.0
5.0
10.0
15.0
20.0
0.0
5.0
10.0
15.0
20.0DEPTHSmith Gardner, Inc.
14 North Boylan Avenue, Raleigh NC 27603
(919) 828-0577 Page 1 of 1
GROUND ELEV.:
NORTHING:EASTING:762991.614 1651988.624
Per 6"FeetInchesFeetCDMW-6
GP/AH
Davidson County C&D Landfill
Lexington, NC
Geologic Exploration
John Burr
Lindsay Quant
11/15/10 11/15/10
23
MC
MC
MC
MC
MC
GP
AH
SANDY CLAY: Dry red fine to medium sandy
clay.
SANDY SILT: Dry white to tan fine to medium
sandy silt. Geoprobe refusal at 7 feet.
PWR: Dry to wet partially weathered granite.
Boring terminated at 23 feet.
14.95
10 am
3/30/11
686.32
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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)DEPTHBLOW COUNTSAMPLING METHODRECOVERYDRILL METHODDESCRIPTION LITHOLOGYWELLINSTALLATION0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0DEPTHSmith Gardner, Inc.
14 North Boylan Avenue, Raleigh NC 27603
(919) 828-0577 Page 1 of 1
GROUND ELEV.:
NORTHING:EASTING:763182.755 1651989.107
Per 6"FeetInchesFeetCDMW-7
GP/AH
Davidson County C&D Landfill
Lexington, NC
Geologic Exploration
John Burr
Lindsay Quant
11/15/10 11/15/10
45
MC
MC
GP
AH
SANDY SILT: Dry red to tan fine to medium
sandy silt.
SAND: Dry white to tan medium coarse sand with
some relict rock texture. Geoprobe refusal at 7
feet.
SILTY SAND: Dry tan silty sand partially
weathered rock (PWR) with some hard lenses.
GRANITE: Dry gray granite.
SILT: Dry brown silt.
GRANITE: Dry to moist gray granite.
SILT: Wet brown silt. Boring terminated at 45
feet.
31.02
11 am
3/30/11
698.58
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Appendix B
Laboratory Analytical Report
September 2017 Groundwater Monitoring Report
Davidson County C&D Landfill
NC Solid Waste Permit No. 29-06
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