2906_DavidsonCoPhase2MSW_GWMR_DIN28639_20170613

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March 2017 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

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-2
TOC=664.06
DTW=12.55
GWE=651.51
MW-1
TOC=734.16
DTW=21.50
GWE=712.66
MW-9
TOC=683.25
DTW=23.40
GWE=659.85
MW-4D
TOC=673.54
DTW=22.45
GWE=651.09
MW-4S
TOC=673.82
DTW=22.79
GWE=651.03
MW-3S
TOC=660.73
DTW=9.43
GWE=651.30
MW-3D
TOC=660.91
DTW=9.30
GWE=651.61
MW-5
TOC=687.31
DTW=32.82
GWE=654.49
MW-7
MW-8
TOC=711.14
DTW=50.91
GWE=660.23
MW-6S
TOC=703.25
DTW=38.74
GWE=664.51
MW-6d
SW-1
SW-2
SW-3
MW-10D
TOC=668.76
DTW=18.24
GWE=650.52
MW-10S
TOC=668.58
DTW=17.70
GWE=650.88
G:\CAD\Davidson\Davdco 16-4\sheets\DAVDCO-B0833.dwg - 5/23/2017 6:04 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 MAPMARCH 2017PHASE 2 LANDFILLDAVIDSON COUNTY, NCJ.A.L.M.M.G.AS SHOWN1May 2017DAVDCO 16-4DAVDCO-B0833(APPROX. 1,600 FT SW
AT RAILROAD BRIDGE)
N35° 50' 39.04"
W80° 11' 30.23"
(APPROX. 1,400 FT NE
AT OLD NC 29 BRIDGE)
N35° 51' 14.89"
W80° 10' 56.85"
N35° 51' 10.41"
W80° 10' 35.15"
(APPROX. 1,000 NE)
AREA 2
MW-1
TOC=
DTW=
GWE=
SW-1
PERIMETER
ACCESS ROAD
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Table 1Groundwater ElevationsDavidson County Phase 2 LandfillMarch 20-24, 2017By: MGDate: 5/11/2017WellWell Installation DateLatitude LongitudeWell Diameter (inches)Total Well Depth (feet bgs)Ground Surface Elevation (feet amsl)TOC Elevation (feet amsl)Depth to Water* (feet)Groundwater Elevation (feet)Screen Interval (feet bgs)Screen GeologyMW-1 3/25/2008 35.85289 80.17643 2.0 20.0 730.65 734.16 21.50 712.66 10-20 sandy siltMW-2 8/12/2008 35.84994 80.18351 2.0 14.5 661.05 664.06 12.55 651.51 9.5-14.5 sandy silt/graniteMW-3S 3/24/2008 35.84948 80.18486 2.0 18.0 657.87 660.73 9.43 651.30 8-18 clay and sandMW-3D 3/26/2008 35.84948 80.18484 2.0 40.5 658.08 660.91 9.30 651.61 35.5-40.5 graniteMW-4S 3/24/2008 35.84953 80.18559 2.0 21.0 670.74 673.82 22.79 651.03 11-21 sandy silt with clayMW-4D 3/26/2008 35.84952 80.18557 2.0 37.0 670.60 673.54 22.45 651.09 32-37 dioriteMW-5 3/24/2008 35.84863 80.18713 2.0 38.0 684.59 687.31 32.82 654.49 28-38 clayey siltMW-6S 3/25/2008 35.84681 80.18525 2.0 40.0 700.00 703.25 38.74 664.51 30-40 sandy silt with gravelMW-8 3/24/2008 35.84736 80.18404 2.0 58.6 708.21 711.14 50.91 660.23 48.6-58.6 dioriteMW-9 8/12/2008 35.84906 80.18614 2.0 30.5 683.68 683.25 23.40 659.85 20.5-30.5 dioriteMW-10S 9/21/2004 35.85083 80.18306 2.0 27.0 665.17 668.58 17.70 650.88 12-27 silty sand, clay & gravelMW-10D 9/21/2004 35.85082 80.18305 2.0 44.0 666.02 668.76 18.24 650.52 36-44 diabaseNote:Survey data from Michael Green and Associates, P.A.amsl = above mean sea levelbgs = below ground surfaceNA = water level data not availableWell construction information from well logs (provided in Appendix A)* Depth to water measured from Top of PVC Casing=H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Davidson\24. Davidson 3-17\Phase 2\3-17_Ph2 dav tables.xlsxDocuSign Envelope ID: B332CD6B-7875-4826-BC1C-CB62AC900C29
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Table 4
Leachate Analytical Data
Davidson County Phase 2 Landfill
March 20-24, 2017
By: JM
Date: 5/29/2017
Parameter Unit Leachate
BOD mg/l 154
COD mg/l 561
Total Suspended Residue mg/l 96
Ammonia Nitrogen as N mg/l 218
Total Phosphorus mg/l 1.37
Antimony ug/l 4.1
Arsenic ug/l 5
Barium ug/l 335
Beryllium ug/l 0.24 J
Cadmium ug/l 0.26 J
Cobalt ug/l 5.2 J
Total Chromium ug/l 21
Copper ug/l 8.5 J
Lead ug/l 4.2 J
Nickel ug/l 38.7 J
Selenium ug/l 6.7 J
Vanadium ug/l 29
Zinc ug/l 78
1,4-Dichlorobenzene ug/l 2.5
2-Butanone ug/l 454
2-Hexanone ug/l 2.11 J
4-Methyl-2-pentanone ug/l 115
Acetone ug/l 119
Benzene ug/l 5.2
Chloroethane ug/l 0.9 J
Cis-1,2-Dichloroethene ug/l 1.4 J
Ethylbenzene ug/l 27.2
Styrene ug/l 0.7 J
trans-1,2-Dichloroethene ug/l 1.7 J
Toluene ug/l 147
Vinyl Chloride ug/l 3.9
Xylenes ug/l 29.3
Note:J-values are laboratory defined between the SWSL and MDL.
=H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Davidson\24. Davidson 3-17\Phase 2\3-17_Ph2 dav tables.xlsx
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Table 5Aquifer Conductivity and Velocity CalculationsDavidson County Phase 2 LandfillMarch 20-24, 2017By: BRDate: 11/08/2016Well Number AquiferConductivity (ft/day)Conductivity (ft/min)Assumed Porosity (n)Gradient (I)Velocity (ft/day)MW-2Sandy Silt6.75E-02 4.69E-05 0.18 0.0201 0.0075MW-3sSand8.60E-02 5.97E-05 0.20 0.0260 0.0112MW-5Clayey Silt4.31E-01 2.99E-04 0.18 0.0255 0.0611MW-6sSand and Gravel4.64E-01 3.22E-04 0.22 0.0113 0.0238MW-8Diorite4.90E-01 3.40E-04 0.10 0.0018 0.0090MW-9Diorite7.20E-01 5.00E-04 0.10 0.0693 0.4989Average: 0.5488Notes:NA = Well had insufficient water to perform Slug Test, or insuffienent data to complete calculation.Porosity assumed based upon soil type from monitoring well boring log. Velocity Calculated by equation V = KI/nGradient for bedrock wells assumed to be the same as for unconsolidated aquifer in Gradient calculated from March 2017 potentiometric surface.+H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Davidson\24. Davidson 3-17\Phase 2\3-17_Ph2 dav tables.xlsxDocuSign Envelope ID: B332CD6B-7875-4826-BC1C-CB62AC900C29
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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)DEPTHBLOW COUNTSAMPLING METHODRECOVERYDRILL METHODDESCRIPTION LITHOLOGYWELLINSTALLATION0.0
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
27.0DEPTHG. 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
Converted to MW-10S
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HSA
Davidson County - Phase 2
Lexington, NC
Engineering Tectonics, P.A.
R. Barron
J. Smyth
9/21/04 10/14/06
44
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.
Converted to MW-10D
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Page 1 Cadmium, total Time-Series Graph of MW-9 Sample DateConcentration (ppb)0510152025308/26/200811/16/20092/6/20114/28/20127/20/201310/10/201412/31/20153/23/2017DocuSign Envelope ID: B332CD6B-7875-4826-BC1C-CB62AC900C29
Page 1 Vanadium Multi-Well Time-Series Graph Sample DateConcentration (ppb)0100200300400500600700800MW-5MW-9MW-4S8/26/200811/16/20092/6/20114/28/20127/20/201310/10/201412/31/20153/23/2017DocuSign Envelope ID: B332CD6B-7875-4826-BC1C-CB62AC900C29