2906-CDLF_DavidsonCountyCDLF_GWMReport_DIN26492_20160322

MARCH 2016 SEMI-ANNUAL GROUNDWATER
MONITORING REPORT
DAVIDSON COUNTY CONSTRUCTION AND DEMOLITION DEBRIS LANDFILL
NORTH CAROLINA SOLIDWASTE PERMIT NUMER 29-06
PREPARED FOR:
DAVIDSON COUNTY INTEGRATED SOLID WASTE
1242 OLD HIGHWAY 29
THOMASVILLE,NORTH CAROLINA 27360-0024
PREPARED BY:
PILOT ENVIRONMENTAL,INC
743 PARKLAWN COURT
KERNERSVILLE, NORTH CAROLINA 27285
MAY 18, 2016
PEI PROJECT NO.1761
Davidson County C&D Landfill
March 2016 Semi-Annual Groundwater Monitoring Report
May 18,2016
Davidson County Construction and Demolition Debris Landfill
NC Solid Waste Permit No 29-06
March 2016 Groundwater Monitoring Report
1.0 INTRODUCTION .....................................................................................................1
2.0 SITE GEOLOGY .......................................................................................................1
3.0 SAMPLING LOCATIONS...........................................................................................1
4.0 SAMPLING PROCEDURES........................................................................................2
5.0 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 STATISTICAL ANALYSIS
Error! Bookmark not defined.
7.0 GROUNDWATER CHARACTERIZATON .....................................................................3
8.0 CONCLUSIONS .......................................................................................................3
9.0 QUALIFICATIONS OF REPORT..................................................................................3
DRAWINGS
Drawing 1 Potentiometric Surface Map
TABLES
Table 1 Groundwater Elevations
Table 2 Field Parameters
Table 3 Summary of Analytical Results
APPENDIX
Appendix A Monitoring Well Logs
Appendix B Laboratory Data Sheets and Chain of Custody Documents
Davidson County C&D Landfill
Semi-Annual Groundwater Monitoring Report
May 18,2016
Page 1
1.0 INTRODUCTION
Pilot Environmental, Inc. (PEI)was contracted by Davidson County to conduct semi-annual
groundwater monitoring at the Davidson County Construction and Demolition Debris (C&D)
Landfill, permit number 29-06 as required by 15A NCAC 13B .0500. Sampling was conducted on
March 22, 2016. This report summarizes the sampling procedures, field and laboratory results
and groundwater characterization as required by North Carolina Solid Waste Regulations.
Drawings, summary tables and laboratory analytical reports are included.
2.0 SITE GEOLOGY
The Davidson County Construction and Demolition Debris (C&D)Landfill facility is located in the
Piedmont Physiographic Province of North Carolina.The Piedmont Physiographic Province
generally consists of hills and ridges which are dissected by a system of swales and streams. The
Piedmont Physiographic Province is predominantly underlain by metamorphic rock (formed by
heat, pressure and/or chemical action) and igneous rock (formed directly from molten material).
The topography and relief of the Piedmont Physiographic Province has developed from
differential weathering of the igneous and metamorphic rock. Ridges and hills have been
developed in areas of less weathered rock. Because of the continued chemical and physical
weathering, rock in the Piedmont Physiographic Province is generally covered with a mantle of
soil that has weathered in place from the parent bedrock. These soils vary in thickness and are
referred to as residuum or residual soils. The residuum is typically finer grained and has higher
clay content near the surface because of the advanced weathering. Similarly, the soils typically
become coarser grained with increasing depth because of decreased weathering. As the
weathering decreases, the residual soils generally retain the overall appearance, texture and
foliations of the parent rock.
According to the Geologic Map of North Carolina (USGS 1985), the site lies within the Carolina
Slate Belt in 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 and surrounding property appear to be underlain by
volcanic rocks from the Flat Swamp Member of the CID Formation and metavolcanic rocks of the
Battleground Formation.The encountered lithology includes sand, silts, partially weathered rock
and hard rock (granite).
3.0 SAMPLING LOCATIONS
The groundwater sampling for the Davidson County C&D Landfill includes five monitoring wells
(CDMW-2, CDMW-3, CDMW-5, CDMW-6 and CDMW-7).The upgradient well for the C&D Landfill
is MW-1S associated with the Phase I Lined Landfill.Surface water sample locations have not
been established for this facility.A trip blank was submitted for quality control purposes. Sample
locations are shown on Drawing 1. Available monitoring well logs are included in Appendix A.
Davidson County C&D Landfill
Semi-Annual Groundwater Monitoring Report
May 18,2016
Page 2
4.0 SAMPLING PROCEDURES
Sampling procedures followed the protocols outlined in the site’s Sampling and Analysis Plan and
the North Carolina Department of Environmental Quality (NCDEQ) Division of Waste
Management Water Quality Monitoring Guidance Document for Solid Waste Facilities.
Prior to sampling, PEI personnel measured the depth to groundwater in each well. Following
measurement of groundwater depth, each well was purged by removing three to five well volumes
or until dry twice.Groundwater elevations are provided in Table 1.
Laboratory prepared containers were provided by Research and Analytical Laboratories, Inc.in
Kernersville, North Carolina (North Carolina Laboratory Certification Number 34).After being
filled, the sample containers were appropriately labeled, placed into a cooler containing ice to
maintain temperature control and transported to the laboratory facility within the specified hold
time for each analysis.
Monitoring wells were inspected and observed to be in good condition and free of obstruction at
the time of sampling.
5.0 RESULTS
5.1 FIELD RESULTS
Temperature, pH, specific conductance and turbidity were measured in the field at the time of
sampling. The field parameter results are summarized in Table 2.
5.2 LABORATORY ANALYSIS
Samples were transported to R&A Laboratories where they were analyzed for C&D metals,
Volatile Organic Compounds (VOCs) using EPA Method 8260B and C&D parameters including
alkalinity, total dissolved solids, chloride and sulfate by approved Solid Waste Section (SWS)
methods.
Analytical results were compared to the NCDEQ DWM SWS Quantitation Limits (SWSLs), 15A
NCAC 2L.0200 Groundwater Quality Standards (2L Standards), SWS established Groundwater
Protection Standards (GWP) and the Federal Maximum Contaminant Limits (MCLs).
Davidson County C&D Landfill
Semi-Annual Groundwater Monitoring Report
May 19,2016
Page 3
5.2.1 Inorganic Constituents
Laboratory analysis detected two low solubility metal analytes including iron (CDMW-2, CDMW-
3 and CDMW-6) and manganese (CDMW-3 and CDMW-6)at concentrations above their
respective NC 2L Standards.Total dissolved residue was detected at a concentration above the
NC 2L Standard in monitoring well CDMW-3. Non-quantifiable (“J-value”) concentrations of
vanadium were detected above the GWP Standard in monitoring wells CDMW-2,CDMW-3,
CDMW-5, CDMW-6 and CDMW-7.A summary of laboratory analytical results is provided in Table
3.
5.2.2 Organic Constituents
Laboratory analysis did not detect VOCs at concentrations above the method reporting limits. A
summary of laboratory analytical results is provided in Table 3.
Tetrahydrofuran (THF) was detected at a concentration above the MDL in monitoring wells
CDMW-3 and CDMW-7. There is no established 2L Standard or MCL for this constituent.
6.0 GROUNDWATER CHARACTERIZATON
A potentiometric surface map was prepared from groundwater elevation data collected during
this sampling event. Based on groundwater elevation data measured during this sampling event,
the groundwater flow direction was determined to be to the northwest, consistent with historic
groundwater flow patterns at the site.The potentiometric surface is shown on Drawing 1.
7.0 CONCLUSIONS
Based on the results of the laboratory analysis,PEI concludes the following:
Laboratory analysis detected iron and manganese at concentrations above their respective 2L
Standards.The analytical results for the C&D Landfill are consistent with historic detections.
Concentrations detected are likely due to variations in naturally occurring constituents and are
not indicative of groundwater impact from the landfill.
8.0 QUALIFICATIONS OF REPORT
The activities and evaluative approaches used in this assessment are consistent with those
normally employed in groundwater assessment projects of this type. Our evaluation of site
conditions has been based on our understanding of the site project information and the data
obtained during our field activities. This report was prepared for the exclusive use of Davidson
County Integrated Solid Waste.
DRAWINGS
Drawing 1 Potentiometric Map
LEGEND
Monitoring Well/Surface Water Sample TOC = Top of Casing
Waste Boundary DTW = Depth to Water
Groundwater Surface Contour GWE = Groundwater Elevation
Drawing 1
2015 Imagery from
Google Earth
Scale: 1” =200’
Date: May 9, 2016
Potentiometric Surface Map
Davidson County C&D Landfill
Lexington, Davidson County,
North Carolina
PEI Project 1761
MW-2
TOC = 708.29
DTW = 39.60
GWE = 668.69
MW-1s
TOC = 736.20
DTW = 54.30
GWE = 681.90
MW-1D
MW-12
TOC = 711.65
DTW = 46.60
GWE = 665.06
SW-1
SW-2
Leachate
Pond
MW-11
TOC = 692.10
DTW = 26.61
GWE = 665.49
MW-10
TOC = 671.64
DTW = 15.80
GWE = 665.84
MW-9a
TOC = 692.60
DTW = 24.70
GWE = 667.90
MW-8
TOC = 661.16
DTW = 7.48
GWE = 653.68
MW-7s
TOC = 663.39
DTW = 7.60
GWE = 655.79
MW-7D
TOC = 663.59
DTW = 7.63
GWE = 655.96
MW-6
TOC = 694.13
DTW = 33.98
GWE = 660.15
MW-5
TOC = 678.23
DTW = 25.53
GWE = 652.70
MW-4
TOC = 673.68
DTW = 19.12
GWE = 654.56
MW-3
TOC = 666.72
DTW = 12.18
GWE = 654.54
CDMW-5
TOC = 699.8
DTW = 24.04
GWE = 675.76
CDMW-3
TOC = 685.0
DTW = 13.60
GWE = 671.40
CDMW-2
TOC = 704.80
DTW = 38.05
GWE = 666.75
CDMW-7
TOC = 701.11
DTW = 28.58
GWE = 672.53
CDMW-6
TOC = 692.27
DTW = 10.37
GWE = 681.90
Phase I Lined Landfill C&D Landfill
Leachate
TABLES
Table 1 Groundwater Elevations
Table 2 Field Parameters
Table 3 Summary of Analytical Results
PEI Project 1761
Monitoring
Well
Well
Installation
Date
Latitude Longitude
Well
Diamter
(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 Geology
CDMW-2 7/16/1998 35.84298 80.17524 2.0 51.0 702.27 704.80 38.05 666.75 41.0-51.0 granite
CDMW-3 12/5/2000 35.84273 80.17615 2.0 27.0 681.02 685.00 13.60 671.40 17.0-27.0 clayey sand and PWR
CDMW-5 1/30/2006 35.84212 80.17707 2.0 47.0 696.79 699.80 24.04 675.76 32.0-47.0 granite
CDMW-6 11/15/2010 35.84076 80.17423 2.0 23.0 689.84 692.27 10.37 681.90 13.0-23.0 PWR
CDMW-7 11/15/2010 35.84128 80.17424 2.0 45.0 698.56 701.11 28.58 672.53 35.0-45.0 silt and granite
Notes:
amsl = above mean sea level
bgs = below ground surface
TOC = Top of casing
*Depth to water measured from TOC
MW-1 is the same well as MW-4 associasted with Holly Grove Landfill
Groundwater Elevations
March 22, 2016
TABLE 1
Davidson County C&D Landfill
PEI Project 1761
Monitoring
Well
pH (Standard
Units)
Conductivity
(umhos)
Temperature
(celsius)Turbity (NTU)
CDMW-2 6.21 109 19.1 7.83
CDMW-3 6.03 155 17.7 31.34
CDMW-5 6.38 204 19.1 1.56
CDMW-6 5.65 367 18.2 47.28
CDMW-7 6.33 463 19.5 5.27
Notes:
TABLE 2
Field Parameters
Davidson County C&D Landfill
March 22, 2016
PEI Project 1761
Parameter
Sample ID CDMW-2 CDMW-3 CDMW-5 CDMW-6 CDMW-7 MDL MRL SWSL 2L or GWP
Standard MCL
1,1-dichloroethane BDL 0.46J BDL BDL BDL 0.2 0.5 5 6 5
benzene BDL 0.30J BDL BDL BDL 0.1 0.5 1 1 5
cis-1,2-dichloroethene BDL 0.11J BDL BDL BDL 0.1 0.5 5 70 70
tetrahydrofuran BDL 44.7 BDL BDL 3.1 5 5 NE NE NE
total alkalinity 29,400 236,000 68,400 41,800 148,000 1,000 1,000 NE NE NE
chloride 3,740 54,300 43,000 15,000 18,700 1,000 1,000 NE 250,000 250,000
total dissolved residue 213,000 606,000 286,000 264,000 290 25,000 25,000 NE 500,000 500,000
sulfate 51,400 99,300 47,600 91,500 62,400 1.7 10,000 250,000 250,000 250,000
antimony BDL BDL BDL BDL BDL 1.9 5 6 1#6
arsenic BDL BDL BDL BDL BDL 2.4 10 10 10 10
barium 47.5J 208 56.3J 10.7J 5.90J 1.3 40 100 700 2,000
beryllium BDL BDL BDL BDL 0.975J 0.4 1 1 4#4
cadmium BDL 0.300J BDL BDL BDL 0.3 1 1 2 5
cobalt BDL BDL BDL 3.25J BDL 1.5 10 10 1#NE
copper 2.65J 5.53J 3.56J BDL 1.46J 1.1 10 10 1,000 1,300
chromium (total)3.74J BDL BDL BDL BDL 1.3 10 10 10 100
iron 376 1,130 BDL 1,580 188J 15.4 50 300 300 300
manganese 12 150 23.2J 94.8 8.59J 1.6 10 50 50 50
lead BDL BDL BDL BDL BDL 1.7 5 10 15 15
nickel BDL 10.5J 2.98J 7.58J 1.84J 1.7 10 50 100 NE
selenium BDL BDL BDL BDL BDL 2.5 10 10 20 50
silver BDL BDL BDL BDL BDL 2.8 10 10 20 100
vanadium 2.35J 5.82J 3.74J 4.78J 6.67J 1.8 10 25 0.3#NE
zinc 22 17.9 21.6 21.8 14.4 2.9 10 10 1,000 5,000
Notes:
MRL = Method Reporting Limit
SWSL = Solid Waste Section Quantitation Limits
2L= NCDEQ Groundwater Standards (15A NCAC 2L 0200)
GWP = Solid Waste Section Groundwater Protection Standards (noted by#)MCL = Federal Maximum Contaminant Limit2B = NCAC 2B Standards for Class C watersNE = Standard Not EstablishedResults presented in ug/l, analogous to parts per billion (ppb)BDL = Compound not detected at a concentration above the MRLBold denotes concentration exceeds the 2L StandardJ = Estimated concentration detected at concentration between the MDL and SWSL
Comparison CriteriaGROUNDWATER SAMPLING
Volatile Organic Compounds
Inorganic Consituents
TABLE 3Summary of Analytical ResultsDavidson County Phase I Lined LandfillMarch 22, 2016
APPENDIX
Laboratory Data Sheets and Chain of Custody Documents
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
0.0
5.0
10.0
15.0
20.0
DE
P
T
H
Smith Gardner, Inc.
14 North Boylan Avenue, Raleigh NC 27603
[phone] Page 1 of 1
GROUND ELEV.:
NORTHING:EASTING:762991.614 1651988.624
Pe
r

6
"
Fe
e
t
In
c
h
e
s
Fe
e
t
CDMW-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
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
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
DE
P
T
H
Smith Gardner, Inc.
14 North Boylan Avenue, Raleigh NC 27603
[phone] Page 1 of 1
GROUND ELEV.:
NORTHING:EASTING:763182.755 1651989.107
Pe
r

6
"
Fe
e
t
In
c
h
e
s
Fe
e
t
CDMW-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