2906_DavidsonCoMSW_GWMR_DIN28624_20170613

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March 2017 Semi-Annual Groundwater Monitoring Report

Davidson County Phase 1 Lined Landfill
NC Solid Waste Permit No. 29-06

Prepared for:

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

June 2017

Prepared by:

© 2017 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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6/13/2017
6/13/2017
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MW-1DSW-3-HGSW-1SW-2LINED MSW LANDFILL(PERMIT 29-06)CDMW-5SW-2MAINTENANCE BUILDINGSCALES/SCALEHOUSEC&D LANDFILL (INACTIVE)200' EXISTING RAILROADRIGHT OF WAY(NC RAILROAD)LEACHATESTORAGE PONDCLOSED PHASE 1MSW LANDFILLPROPERTY LINE (TYP.)DUKE POWERTRANSMISSION LINERIGHT OF WAYBORROW &STOCKPILEAREAACTIVE MSW LANDFILL(PHASES 2 AREA 1)G:\CAD\Davidson\Davdco 16-7\sheets\DAVDCO-B0834.dwg - 5/24/2017 11:05 AMSMITHGARDNER+DRAWN: APPROVED:PROJECT NO:SCALE:FILENAME:DATE:FIGURE NO. PREPARED BY:PREPARED FOR:© 2017 Smith Gardner, Inc.POTENTIOMETRIC SURFACE MAPMARCH 2017CLOSED PHASE 1 AND C&DDAVIDSON COUNTY, NCJ.A.L. M.M.G. AS SHOWN 1May 2017DAVDCO 16-7 DAVDCO-B0834*DocuSign Envelope ID: 0EEFE41D-28D9-4400-89AD-B5755D54353E
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Table 1Groundwater ElevationsDavidson County Phase 1 Lined LandfillMarch 20-24, 2017By: MGDate: 5/11/2017WellWell 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 GeologyMW-1S 6/19/1991 35.84160 80.17795 2.0 62.5 731.10 736.20 55.69 680.51 47.5-62.5 schistMW-2 5/5/1994 35.84139 80.18294 2.0 39.0 704.59 708.29 DRY DRY 24-39 dioriteMW-3 4/27/1994 35.84426 80.17685 2.0 20.0 663.89 666.72 12.40 654.32 7.5-17.5 sand, silt and clayMW-4 4/28/1994 35.84468 80.17803 2.0 20.0 682.10 673.68 19.35 654.33 10-20 sand, silt and clayMW-5 3/24/2008 35.84490 80.17870 2.0 38.0 676.29 678.23 25.83 652.40 28-38 clayey siltMW-6 6/7/1994 35.84419 80.17941 2.0 68.5 691.19 694.13 34.42 659.71 58.5-68.5 granite gneissMW-7S 4/25/1994 35.84409 80.18056 2.0 15.0 661.35 663.39 8.08 655.31 5-15 clay and silt or sandMW-7D 4/26/1994 35.84404 80.18064 2.0 46.0 661.13 663.59 8.45 655.14 36-46 sand and clayMW-8 4/27/1994 35.84438 80.18226 2.0 15.0 661.31 661.16 8.28 652.88 5-15 sand, silt and clayMW-9A 11/11/2010 35.84381 80.18290 2.0 33.0 691.34 692.60 26.94 665.66 23-33 silt and PWRMW-10 9/8/1999 35.84356 80.18383 2.0 27.5 667.00 671.64 22.28 649.36 17.5-27.5 dioriteMW-11 12/18/1997 35.84274 80.18392 2.0 33.0 689.22 692.10 27.05 665.05 23-33 rockMW-12 9/7/1999 35.84194 80.18391 2.0 80.0 709.29 711.66 49.40 662.26 70-80 granite pegmatiteNotes: Survey Data collected 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 TOC* MW-1 is the same well as MW-4 associated with Holly Grove Landfill.H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Davidson\24. Davidson 3-17\Mar-17 dav gw sampling tables.xlsxDocuSign Envelope ID: 0EEFE41D-28D9-4400-89AD-B5755D54353E
Table 2Field ParametersDavidson County Phase 1 Lined LandfillMarch 20-24, 2017By: MGDate: 5/11/2017pH Conductivity Temperature Turbidity(Std. Units) (umhos) (celsius) (NTU)MW-1S 5.72 180 18.2 2.82MW-3 5.35 150 15.8 26.9MW-4 5.22 110 15.8 34.2MW-5 5.85 120 16.6 3.89MW-6 6.26 120 16.7 5.68MW-7S 5.11 90 15.1 60.6MW-7D 5.56 70 16.4 13.7MW-8 5.61 130 13.6 57.8MW-9A 5.79 160 16 15.4MW-10 5.82 150 14.6 9.91MW-11 5.60 130 14.6 117MW-12 5.92 180 14.4 6.02SW-1 6.71 140 13.2 8.71SW-2 6.68 130 16.7 6.33Notes:Data Collected by S+G personel* MW-1S is the same well as MW-4 associated with Holly Grove Landfill.WellH:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Davidson\24. Davidson 3-17\Mar-17 dav gw sampling tables.xlsxDocuSign Envelope ID: 0EEFE41D-28D9-4400-89AD-B5755D54353E
Table 3Detected ConstituentsDavidson County Phase 1 Lined LandfillMarch 20-24, 2017By: JMDate:5/29/2017Parameter MDL SWSL2L or GWPMCL 2B MW-1S* MW-3 MW-4 MW-5 MW-6 MW-7D MW-7S MW-8 MW-9A MW-10 MW-11 MW-12 SW-1 SW-2Inorganic Constituentstotal alkalinity (mg CACO3/l) 1 NE NE NE NE240 NA NA NA NA NA NA NA NA NA NA NA NA NAchloride (mg/l) 5 NE 250 250**23094 NA NA NA NA NA NA NA NA NA NA NA NA NAtotal dissolved residue (mg/l) 1 NE 500 500**500486 NA NA NA NA NA NA NA NA NA NA NA NA NAsulfate 5 250 250 250**25029.2 J NA NA NA NA NA NA NA NA NA NA NA NA NAantimony 0.0561 §6 640<0.05 <0.05 <0.05 <0.05 0.06 J <0.05 <0.05 0.09 J 0.06 J <0.05 <0.05 <0.05 <0.05 <0.05barium 0.02100 700 2000 2000000 40.7 J 44.7 J 40.6 J 36.1 J 12.3 J 8.6 J 22.8 J 20.9 J 5 J 3 J 17.4 J 0.93 J 24.7 J 23.4 Jberyllium 0.0414 §4 6.5 <0.04 0.04 J <0.04 <0.04 <0.04 <0.04 <0.04 0.1 J <0.04 <0.04 0.29 J <0.04 <0.04 <0.04cadmium 0.051 2 5 2 <0.05 <0.05 <0.05 <0.05 0.1 J <0.05 <0.05 <0.05 <0.05 <0.05 0.1 J <0.05 <0.05 <0.05cobalt 0.04101 §NE 270 0.15 J 0.51 J 1.3 J 0.1 J 0.08 J 0.26 J 1.4 J 1.6 J 0.11 J 0.46 J 1.5 J 0.19 J 0.6 J 0.49 Jchromium, total 0.0610 10 100 50 <0.06 0.35 J 2 J <0.06 <0.06 <0.06 0.08 J 2 J 2.9 J 0.56 J 9.1 J 0.27 J 0.77 J 0.29 Jcopper 0.0710 1000 1300 7 0.63 J 3.1 J 6.3 J 0.52 J 0.19 J 1.5 J 0.7 J 7.5 J 0.65 J 0.88 J 12 0.32 J 0.93 J 0.79 Jiron 5.23300 300 300 1000 102 J NA NA NA NA NA NA NA NA NA NA NA NA NAlead 0.0610 151525 0.08 J 0.24 J 1.3 J 0.08 J 0.06 J 0.2 J 1.4 J 1.1 J 0.09 J 0.18 J 1.6 J <0.06 0.24 J 0.14 Jmanganese 0.0650 5050200 11 NA NA NA NA NA NA NA NA NA NA NA NA NAnickel 0.0650 100NE88 1.7 J 1.1 J 1.6 J 0.45 J 0.56 J 0.1 J 1.8 J 2.0 J 0.95 J 1.1 J 5.6 J 1.4 J 0.73 J 0.77 Jselenium 0.5410 20505 0.9 J <0.54 <0.54 <0.54 <0.54 <0.54 <0.54 <0.54 0.57 J <0.54 <0.54 <0.54 <0.54 <0.54vanadium 0.36250.3 §NE NE 2 J 7.2 J 6.3 J 3 J <0.36 1.3 J 1.7 J 8.2 J 6.5 J 7.1 J 23.8 J 4.9 J 1.2 J 0.67 Jzinc 1.6110 1000 5000 50 <1.61 5.2 J 12 6 J 21 3.2 J 3 J 11 4.1 J 2.3 J 13 <1.61 <1.61 8.4 JOrganic Constituentscarbon disulfide0.23 100 700 NE 20000 <0.23 <0.23 <0.23 <0.23 <0.23 <0.23 <0.23 <0.23 <0.23 <0.23 <0.23 <0.23 2.5 J 1.3 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 Standard2B-NCAC 2B Standard for Class C watersJ-Laboratory defined detection between MDL and SWSL<MDL -Not detected at or above MDLNA -Sample Not AnalyzedNE - Standard Not EstablishedBold -Above 2L or GWP Standard* MW-1S is the same well as MW-4 associated with Holly Grove Landfill.Table units are presented in ug/l, unless otherwise notedLab data analysis by Environment 1, Inc. report dated 4/20/2017, Client ID#6038.H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Davidson\24. Davidson 3-17\Mar-17 dav gw sampling tables.xlsxDocuSign Envelope ID: 0EEFE41D-28D9-4400-89AD-B5755D54353E
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Table 4
Leachate Analytical Data
Davidson County Phase 1 Lined Landfill
March 20-24, 2017
By: JM
Date: 5/29/2017
Parameter Unit Leachate
BOD mg/l 8
COD mg/l 79
Nitrate Nitrogen as N mg/l 0.17 J
Total Phosphorus as P mg/l 0.12
Sulfate mg/l 32.8 J
Antimony ug/l 0.8 J
Arsenic ug/l 0.98 J
Barium ug/l 46.2 J
Beryllium ug/l 0.05 J
Cobalt ug/l 1.2 J
Total Chromium ug/l 1.0 J
Copper ug/l 2.1 J
Lead ug/l 0.1 J
Nickel ug/l 14.2 J
Selenium ug/l 1.4 J
Vanadium ug/l 2.6 J
Zinc ug/l 1.9 J
NOTES:
Lab data analysis by Environment 1, Inc. report dated 4/20/2017, Client ID#6038A.
p
laboratory MDL and the SWSL. These are estimated
concentrations.
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Table 5
Aquifer Conductivity and Velocity Calculations
Davidson County Phase 1 Lined Landfill
March 20-24, 2017
By: BR
Date: 12/15/2016
Well Number Aquifer
Conductivity
(ft/day)
Conductivity
(ft/min)
Assumed
Porosity (n)Gradient (I)Velocity
(ft/day)
MW-1S Bedrock 0.14 9.72E-05 0.1 0.010 0.0143
MW-2 Bedrock 0.17 1.18E-04 0.1 NM NM
MW-3 Unconsolidated 0.62 4.31E-04 0.2 0.062 0.1913
MW-4 Unconsolidated 1.31 9.10E-04 0.2 0.062 0.4052
MW-6 Bedrock 0.02 1.39E-05 0.1 0.059 0.0118
MW-7S Unconsolidated 0.38 2.64E-04 0.15 0.059 0.1485
MW-8 Unconsolidated 0.57 3.96E-04 0.15 0.035 0.1343
MW-9A Unconsolidated 2.65 1.84E-03 0.1 0.094 2.4998
MW-10 Unconsolidated 0.88 6.11E-04 0.2 0.081 0.3545
MW-11 Unconsolidated 4.13 2.87E-03 0.2 0.144 2.9647
MW-12 Unconsolidated 0.58 4.03E-04 0.2 0.046 0.1324
Average 0.6857
Notes: Velocity Calculated from V=K*I/n where:
V = velocity
K = Hydraulic Conductivity
I = Gradient
n = Porosity
Hydraulic Conductivity data from slug tests performed in 1994
Porosity values assumed from Groundwater & Wells (Driscoll)
Survey Data collected by Michael Green and Associates.
Gradient calculated from March 2017 potentiometric surface.
NM - Not Measured
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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 (BLS)DEPTHBLOW COUNTSAMPLING METHODRECOVERYDRILL METHODDESCRIPTION LITHOLOGYWELLINSTALLATION0.0
5.0
10.0
15.0
20.0
25.0
30.0
0.0
5.0
10.0
15.0
20.0
25.0
30.0DEPTHRichardson Smith Gardner & Assoc
14 North Boylan Avenue, Raleigh NC 27603
[phone] Page 1 of 1
GROUND ELEV.:
NORTHING:EASTING:764126.597 1649351.338
Per 6"FeetInchesFeetMW-9a
AH
Davidson Co Phase 1 Landfill
Davidson County
Geologic Explorations
Johnny Burr
Lindsay Quant
11/11/10 11/11/10
33
Grab
Grab
Grab
Grab
Grab
Grab
AH SILT: Dry tan silt.
SILTY CLAY: Dry tan silty clay.
SANDY SILT: Dry tan sandy silt.
SILT: Dry to moist gray silt.
PWR: Moist to wet gray silty partially weathered
granitic rock. Boring terminated at 33 feet.
686.32
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