HomeMy WebLinkAbout2902-MSWLF-1985_DavidsonCountyLandfill_GWMReport_DIN26495_20160323MARCH 2016 SEMI-ANNUAL GROUNDWATER
MONITORING REPORT
DAVIDSON COUNTY HOLLY GROVE LANDFILL
NORTH CAROLINA SOLIDWASTE PERMIT NUMER 29-02
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.1763
Davidson County Holly Grove Landfill
March 2016 Semi-Annual Groundwater Monitoring Report
May 18, 2016
Davidson County Holly Grove Landfill
NC Solid Waste Permit No 29-02
March 2016 Semi-Annual Groundwater Monitoring Report
1.0 INTRODUCTION .....................................................................................................1
2.0 SITE GEOLOGY .......................................................................................................1
3.0 SAMPLING LOCATIONS...........................................................................................2
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
5.2.3 Surface Water..........................................................................................3
6.0 GROUNDWATER CHARACTERIZATON .....................................................................3
7.0 CONCLUSIONS .......................................................................................................4
8.0 QUALIFICATIONS OF REPORT..................................................................................4
DRAWINGS
Drawing 1 Potentiometric Surface Map
TABLES
Table 1 Groundwater Elevations
Table 2 Field Parameters
Table 3 Summary of Analytical Results
Table 4 Leachate Analytical Data
Table 5 Groundwater Velocity Calculations
APPENDIX
Appendix A Monitoring Well Logs
Appendix B Laboratory Data Sheets and Chain of Custody Documents
Davidson County Holly Grove 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 Holly Grove Landfill, permit number 29-02 as
required by 15A NCAC 13B .0500. Sampling was conducted on March 23 and 24, 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.
Three landfills are currently monitored under 29-02 as the Holly Grove Landfill due to their close
proximity to one another. Areas 1 and 2, located within the Holly Grove Landfill, were unlined
municipal solid waste facilities owned and operated by Davidson County Integrated Solid Waste.
The third area, the Scarlett Landfill located west of Areas 1 and 2, is a private landfill originally
owned and operated by Mr. Scarlett, then owned by Ms. Virginia White who sold the Scarlett
property to Hale Artificier, Inc. in 2001. This property is currently used to house storage
containers.
2.0 SITE GEOLOGY
The Davidson County Holly Grove 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.
Davidson County Holly Grove Landfill
Semi-Annual Groundwater Monitoring Report
May 18, 2016
Page 2
3.0 SAMPLING LOCATIONS
The groundwater monitoring network for the Davidson County Holly Grove Landfill includes
sixteen monitoring wells (MW-1A, MW-2, MW-3A, MW-4, MW-5, MW-6,MW-8, MW-9, MW-10,
MW-11,MW-12, MW-13, MW-14, MW-15, MW-16 and MW-17) and three surface water samples
(SW-1,SW-2 and SW-3).The upgradient well for the Holly Grove Landfill is MW-1S, the
background monitoring well for the Phase I Lined Landfill.That information is included as MW-
4.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.
4.0 SAMPLING PROCEDURES
Sampling procedures followed the protocols outlined in the Water Quality Monitoring 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.
Sampling wells and surface water sample locations 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 metals using EPA
Method 200.7 and Volatile Organic Compounds (VOCs) using EPA Method 8260B.
Davidson County Holly Grove Landfill
Semi-Annual Groundwater Monitoring Report
May 18, 2016
Page 3
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). Analytical
results of surface water samples were compared with the NCAC 2B Standard for Class C waters
(2B Standards)
Most constituents were reported below the method detection limit (MDL) or at non-quantifiable
values (J-value) defined by the laboratory as between the MDL and the SWL.
5.2.1 Inorganic Constituents
Laboratory analysis detected low solubility metal analytes at concentrations above their
respective 2L Standards, GWP Standards or SWSLs. Cobalt was detected at a concentration above
the 2L Standard in monitoring wells MW-9, MW-10, MW-11 and MW-13 and total chromium was
detected at a concentration above the 2L Standards in MW-9.A summary of laboratory analytical
results for inorganic constituents is provided in Table 3.
5.2.2 Organic Constituents
The following constituents were detected at concentrations above their 2L Standard.
1,1-dichloroethane (MW-1A, MW-6 and MW-12)
1,2-dichloropropane (MW-1A)
1,2-dichloroethane (MW-1A)
1,4-dichlorobenzene (MW-13)
Benzene (MW-1a, MW-8, MW-9 and MW-13)
Vinyl Chloride (MW-1A)
A summary of laboratory analytical results for organic constituents is provided in Table 4.
5.2.3 Surface Water
Laboratory analysis of surface water samples did not detect constituents at concentrations above
the 2B Standards.A summary of laboratory analytical results is provided in Tables 3 and 4.
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,
groundwater flow direction was determined to be to the northwest, consistent with historic
groundwater flow patterns at the site.The potentiometric surface map is included as Drawing 1.
Davidson County Holly Grove Landfill
Semi-Annual Groundwater Monitoring Report
May 18, 2016
Page 4
Groundwater flow velocities were also calculated for this sampling event. Groundwater flow
velocities were calculated for monitoring wells using the equation:
V = Ki/n
Where:V = average velocity of groundwater flow
K = hydraulic conductivity
i = groundwater gradient
n = porosity
Groundwater velocities ranged from 0.018 ft/day (MW-3a) to 1.365 ft/day (MW-15) with an
average of 0.557 ft/day. A summary of the measurements and calculations are provided in Table
5.
7.0 CONCLUSIONS
Based on the results of the laboratory analysis,PEI concludes the following:
Laboratory analysis detected cobalt at a concentration above the 2L Standard in monitoring wells
MW-9, MW-10, MW-11 and MW-13 and total chromium at a concentration above the 2L
Standards in MW-9.
The analytical results for the Holly Grove Landfill are consistent with historic detections.
Inorganic concentrations detected are likely due to variations in naturally occurring constituents
or elevated turbidity in the groundwater monitoring well at the time of sampling and are not
indicative of groundwater impact from the landfill.
Volatile organic compounds were detected in several monitoring wells at the site. The results
appear to be consistent with historical detections. Surface water samples did not detect
concentrations above 2B Standards.
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 express use of Davidson
County Integrated Solid Waste.
DRAWINGS
Drawing 1 Potentiometric Map
LEGEND
Monitoring Well/Surface Water Sample
Waste Boundary
Groundwater Surface Contour
TOC =Top of Casing
DTW = Depth to Water
GWE = Groundwater Elevation
Drawing 1
2015 Imagery from
Google Earth
Scale: 1”=400’
Date: May 9, 2016
Potentiometric Surface Map
Davidson County Holly Grove Landfill
Lexington, Davidson County,
North Carolina
PEI Project 1763
SW-3
MW-8
TOC = 737.6
DTW = 13.34
GWE = 724.26
Holly Grove
Landfills
MW-6
TOC = 781.25
DTW = 63.06
GWE = 718.19
MW-16
TOC = 757.54
DTW = 10.79
GWE = 746.75
MW-1A
TOC = 781.39
DTW = 27.45
GWE = 753.94 MW-17
TOC = 737.99
DTW = 9.88
GWE = 728.11
MW-15
TOC = 697.33
DTW = 9.77
GWE = 687.56
MW-14
TOC = 666.04
DTW = 10.91
GWE = 655.13
MW-5
TOC = 664.29
DTW = 8.68
GWE = 655.61
SW-1
MW-3A
TOC = 662.49
DTW = 5.41
GWE = 657.08
MW-2
TOC = 665.81
DTW = 5.41
GWE = 660.40
MW-12
TOC = 671.48
DTW = 15.37
GWE = 656.11
MW-13
TOC = 671.31
DTW = 13.24
GWE = 658.07
MW-11
TOC = 680.07
DTW = 25.26
GWE = 654.81
SW-2
MW-10
TOC = 678.24
DTW = 4.60
GWE = 673.64
MW-9
TOC = 719.03
DTW = 11.25
GWE = 707.78
MW-4
TOC = 736.20
DTW = 54.30
GWE = 681.90
710
700
690680
670
660
71
0
70
0
69
0
TABLES
Table 1 Groundwater Elevations
Table 2 Field Parameters
Table 3 Summary of Groundwater Analytical Results
Inorganic Parameters
Table 4 Summary of Groundwater Analytical Results
Organic Parameters
Table 5 Groundwater Velocity Calculations
PEI Project 1763
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
MW-1A 1/23/1990 35.83753 80.17098 2.0 37.5 778.68 781.39 27.45 753.94 27.5-37.5 metavolcanic bedrock
MW-2 9/22/1987 35.84139 80.18294 2.0 16.8 704.59 665.81 5.41 660.40 11.8-16.8 diorite
MW-3A 1/23/1990 35.83236 80.17402 2.0 32.0 659.80 662.49 5.41 657.08 22.0-32.0 metavolcanic bedrock
MW-4**6/19/1991 35.84160 80.17795 2.0 62.5 731.10 736.20 54.30 681.90 47.5-62.5 schist
MW-5 10/27/1992 35.84468 80.17803 2.0 25.0 682.10 664.29 8.68 655.61 10.0-25.0 metavolcanic bedrock
MW-6 7/30/1997 35.84490 80.17870 2.0 65.0 676.29 781.25 63.06 718.19 55.0-65.0 diorite
MW-8 7/29/1997 35.84438 80.18226 2.0 57.0 661.31 737.60 13.34 724.26 47.0-57.0 diorite
MW-9 7/25/1997 35.83928 80.17440 2.0 21.0 717.65 719.03 11.25 707.78 11.0-21.0 clayey silty sand & diorite
MW-10 7/30/1997 35.84356 80.18383 2.0 13.0 667.00 678.24 4.60 673.64 5.5-13.0 clayey silt and diorite
MW-11 7/29/1997 35.84274 80.18392 2.0 38.0 689.22 680.07 25.26 654.81 28.0-38.0 diorite
MW-12 7/30/1997 35.84194 80.18391 2.0 65.0 709.29 671.48 15.37 656.11 55.0-65.0 diorite
MW-13 7/29/1997 35.83406 80.17554 2.0 22.5 668.59 671.31 13.24 658.07 12.5-22.5 sandy silt and granite
MW-14 7/24/1997 35.83152 80.17106 2.0 42.0 664.78 666.04 10.91 655.13 32.0-42.0 diorite
MW-15 7/25/1997 35.83310 80.17147 2.0 23.5 696.01 697.33 9.77 687.56 8.5-23.5 silty clay and granite
MW-16 12/7/2000 35.83744 80.17023 2.0 50.0 755.47 757.54 10.79 746.75 30.0-50.0 diorite
MW-17 12/7/2000 35.83656 80.17076 2.0 39.5 734.74 737.99 9.88 728.11 29.5-39.5 diorite
Notes:
amsl = above mean sea level
bgs = below ground surface
TOC = Top of casing
*Depth to water measured from TOC
**MW-4 is the same well as MW-1S associasted with Phase I Lined Landfill
Groundwater Elevations
March 23, 2016
TABLE 1
Davidson County Holly GroveLandfill
PEI Project 1763
Monitoring
Well
pH (Standard
Units)
Conductivity
(umho)
Temperature
(celsius)Turbity (NTU)
MW-1A 6.58 159 17.1 7.1
MW-2 7.24 149 21.1 2.02
MW-3A 7.23 328 16.4 3.13
MW-4*6.28 65.4 17.4 4.69
MW-5 6.73 266 18.9 3.41
MW-6 7.58 486 16.2 14.4
MW-8 6.89 460 20.3 5.49
MW-9 6.55 570 13.7 103.5
MW-10 6.74 704 12.4 22.9
MW-11 6.58 480 14.7 5.59
MW-12 6.82 622 15.4 7.09
MW-13 6.36 586 13.9 5.8
MW-14 6.71 250 17.6 2.45
MW-15 6.97 295 18.2 8.2
MW-16 7.28 405 22.8 17.4
MW-17 6.82 702 17.1 6.84
SW-1 6.87 296 12.2 9.3
SW-2 7.65 322 12.9 5.2
Notes:
* MW-4 is the same well as MW-1S associated with the Phase I Lined Landfill
TABLE 2
Field Parameters
Davidson County Holly Grove Landfill
March 23, 2016
PEI Project 1763
Parameter
Sample ID MW-1A MW-2 MW-3A MW-4*MW-5 MW-6 MW-8 MW-9 MW-10 MW-11 MW-12 MW-13 MW-14 MW-15 MW-16 MW-17 SW-1 SW-2 SW-3 MDL MRL SWSL 2L or GWP
Standard MCL 2B Standard
antimony BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 1.9 5 6 1#6 640
arsenic BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 2.4 10 10 10 10 10
barium 98.6J 111 24.7J 47.0J 41.9J 31.3J 39.8J 187 157 123 67.4J 180 30.8J 31.6J 29.6J 212 15.9J 20.8J 70.2J 1.3 40 100 700 2,000 2,000,000
beryllium BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 0.4 1 1 4#4 6.5
cadmium 0.505J 0.395J 0.440J BDL BDL BDL 0.425J BDL 0.415J 0.770J 0.470J BDL 0.335J 0.370J 0.450J 0.355J BDL BDL 0.035J 0.3 1 1 2 5 2
cobalt BDL 6.78J BDL BDL BDL BDL BDL 20.5 12.6 44.1 BDL 27.5 BDL 4.14J BDL 4.10J BDL BDL BDL 1.5 10 10 1#NE 270
copper BDL BDL BDL 3.26J BDL 1.82J 3.64J 22.3 8.64J BDL 1.82J BDL BDL 3.36J BDL 1.56J 1.14J 1.26J 1.72J 1.1 10 10 1,000 1,300 7
chromium (total)6.49J 4.44J BDL BDL BDL 6.82J 4.38J 19.9 5.35J 0.421J 1.38J 8.40J BDL 3.44J BDL 1.40J BDL BDL BDL 1.3 10 10 10 100 50
lead BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 1.93J BDL 1.7 5 10 15 15 28
nickel BDL BDL BDL BDL BDL BDL 6.46 10.9J 25.1J 14.3J 6.04J 31.4J BDL 2.85J BDL BDL 2.16J 2.27J 3.08J 1.7 10 50 100 NE 88
selenium 8.16J 6.39J BDL BDL BDL BDL BDL 3.0J 4.64J 4.11J BDL 5.98J BDL BDL BDL BDL BDL BDL BDL 2.5 10 10 20 50 5
silver BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 2.8 10 10 20 100 0.06
vanadium BDL BDL BDL 3.03J BDL 2.59J BDL 15.7J 6.51J BDL BDL 1.90J 2.07J 3.76J 2.59J BDL BDL BDL BDL 1.8 10 25 0.3#NE NE
zinc 18.3 14.7 23 14.8 14.2 30.6 16.1 44.1 19 16.5 13.2 22.4 17.6 21 18.7 19.1 22.5 17.6 37.2 2.9 10 10 1,000 5,000 50
Notes:
MDL = Method Detection Limit
MRL = Method Reporting LimitSWSL = Solid Waste Section Quantitation Limits2L= 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 Established
Results presented in ug/l, analogous to parts per billion (ppb)
BDL = Compound not detected at a concentration above the MDLBold denotes concentration exceeds the 2L or GWP StandardJ = Estimated concentration detected at concentration between the MDL and SWSL*MW-4 is the same well as MW-1S associated with the Phase I Lined Landfill
GROUNDWATER SAMPLING
Inorganic Consituents
TABLE 3Summary of Analytical Results - Inorganic ParametersDavidson County Holly Grove LandfillMarch 23, 2016
Comparison Criteria
PEI Project 1763
Parameter
Sample ID MW-1A MW-2 MW-3A MW-4*MW-5 MW-6 MW-8 MW-9 MW-10 MW-11 MW-12 MW-13 MW-14 MW-15 MW-16 MW-17 SW-1 SW-2 SW-3 MDL MRL SWSL 2L Standard MCL
1,1-dichloroethene 0.17J BDL 0.15J BDL BDL BDL 0.32J BDL BDL BDL 0.90J 0.15J BDL BDL BDL BDL BDL BDL BDL 0.1 0.5 5 7 7
1,1-dichloroethane 21.3 BDL 4.23J BDL 0.30J 10.2 19.8 0.36J BDL 2.15J 9.39 4.87J BDL BDL BDL 4.1J BDL BDL BDL 0.2 0.5 5 6 NE
1,2-dichloropropane 4.12 BDL BDL BDL BDL 0.63J 0.26J BDL BDL 0.28J 0.37J BDL 1.81J BDL BDL 0.28J BDL BDL BDL 0.1 0.5 1 0.6 5
1,1,2-trichloroethane BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 0.87J BDL BDL BDL BDL BDL BDL BDL 0.2 0.5 1 200 5
1,2-dichloroethane 1.66 BDL BDL BDL BDL BDL 0.24J BDL BDL BDL 0.48J 0.12J BDL BDL BDL BDL BDL BDL BDL 0.1 0.5 1 0.4 5
1,2-dichlorobenzene BDL BDL BDL BDL BDL BDL BDL 0.26J BDL 0.61J 0.48J 0.91J BDL BDL BDL BDL BDL BDL BDL 0.1 0.5 5 20 600
1,3-dichlorobenzene BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 0.22J BDL BDL BDL BDL BDL BDL BDL 0.1 0.5 5 200 NE
1,4-dichlorobenzene 4.9 0.46J 0.54J BDL BDL BDL 0.26J 4.19 BDL 1.86 4.91 6.02 BDL BDL BDL BDL BDL BDL BDL 0.1 0.5 1 6 75
cis-1,2-dichloroethene 41 BDL 0.56J BDL 0.43J BDL 0.86J 0.29 BDL 0.39J 0.35J BDL 0.24J BDL BDL 0.93J BDL BDL BDL 0.1 0.5 5 70 70
Acetone BDL BDL BDL BDL BDL BDL BDL BDL BDL 2.10J BDL 6.57J BDL BDL BDL BDL BDL BDL BDL 1.2 25 100 6,000 NE
benzene 4.78 BDL 0.31J BDL 0.11J BDL 1.33 2.86 BDL 0.26J 0.96J 3.2 BDL BDL BDL BDL BDL BDL BDL 0.1 0.5 1 1 5
chlorobenzene 0.57J 1.51J 0.32J BDL BDL BDL BDL 6.18 BDL 4.1 4.62 20.6 BDL BDL BDL BDL BDL BDL BDL 0.1 0.5 3 50 100
chloroethane 5.11J BDL 0.56J BDL 0.94J BDL 1.49J 0.84J BDL 0.36J 9.50J 44 0.32J BDL BDL 0.26J BDL BDL BDL 0.1 1 10 3,000 NE
trans-1,2-dichloroethene 0.66J BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 0.1 0.5 5 100 100
toulene BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 0.42J BDL BDL BDL BDL BDL BDL BDL 0.3 0.5 1 600 1,000
tetrachloroethene BDL BDL BDL BDL BDL 0.58J BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 0.2 0.5 1 0.7 5
trichloroethene 0.57J BDL BDL BDL BDL BDL 2.4 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 0.1 0.5 1 3 5
trichloroflouromethane BDL 0.28J BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 2.39 BDL BDL BDL BDL BDL BDL 0.1 0.5 1 2,000 NE
vinyl chloride 1.72 BDL 0.30J BDL BDL BDL 0.35J BDL BDL 0.45J BDL 0.40J 0.1J BDL BDL BDL BDL BDL BDL 0.1 0.5 1 0.3 2
xylenes BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 0.95J BDL BDL BDL BDL BDL BDL BDL 0.3 1 5 500 10,000
Notes:MDL = Method Detection LimitMRL = Method Reporting Limit
SWSL = Solid Waste Section Quantitation Limits
2L= NCDEQ Groundwater Standards (15A NCAC 2L 0200)MCL = Federal Maximum Contaminant LimitNE = Standard Not Established
Results presented in ug/l, analogous to parts per billion (ppb)
BDL = Compound not detected at a concentration above the MDLBold denotes concentration exceeds the 2L StandardJ = Estimated concentration detected at concentration between the MDL and SWSL*MW-4 is the same well as MW-1S associated with the Phase I Lined Landfill
Organic Consituents
TABLE 4Summary of Analytical Results - Organic ParametersDavidson County Holly Grove LandfillMarch 23, 2016
GROUNDWATER SAMPLING Comparison Criteria
PEI Project 1763
Monitoring
Well Aquifer Conductivity
(ft/day)
Conductivity
(ft/min)
Assumed
Porosity (n)Gradient (i)Velocity
(ft/day)
MW-2 Uncosolidated 1.440 1.00E-03 0.20 0.076 0.547
MW-3A Bedrock 0.105 7.27E-05 0.15 0.026 0.018
MW-5 Bedrock 1.814 1.26E-05 0.20 0.031 0.281
MW-9 Uncosolidated 3.787 2.63E-03 0.20 0.020 0.379
MW-11 Bedrock 1.440 1.00E-03 0.15 0.038 0.365
MW-13 Uncosolidated 5.890 4.09E-03 0.20 0.032 0.942
MW-15 Uncosolidated 5.688 3.95E-03 0.20 0.048 1.365
Notes:
Velocity calculated from V=Ki/n
V = Velocity
K= Hydrulic Conductivity
i= gradient
n= porosity
Hydraulic conductivity data from slug testing performedin 1994.
Porosity values assumed from Groundwater & Wells (Driscoll).
Gradient calculated from March 2016 potentiometric surface.
TABLE 5
Groundwater Velocity Calculations
Davidson County Holly Grove Landfill
March 23, 2016
APPENDIX
Monitoring Well Logs
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
25.0
30.0
35.0
40.0
45.0
50.0
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
DE
P
T
H
Smith Gardner, Inc.
14 North Boylan Avenue, Raleigh NC 27603
(919) 828-0577 Page 1 of 1
GROUND ELEV.:
NORTHING:EASTING:0 0
Pe
r
6
"
Fe
e
t
In
c
h
e
s
Fe
e
t
MW-16
HSA/AH
Davidson County - Holly Grove Landfills
Lexington, NC
Engineering Tectonics, P.A.
R. Barron
P. May
12/7/00 1/11/00
50
SS
SS
6"
0"
HSA
AH
PWR: Dry tan-orange partially weathered rock w/
white mottles throughout.
DIORITE: Competent diorite.
DIORITE: Competent diorite. Boring terminated at
50'.
26,50/5"
50/0"
38.0
16:00
1/11/00
41.69
1/24/01
10:00
NA
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
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
DE
P
T
H
Smith Gardner, Inc.
14 North Boylan Avenue, Raleigh NC 27603
(919) 828-0577 Page 1 of 1
GROUND ELEV.:
NORTHING:EASTING:0 0
Pe
r
6
"
Fe
e
t
In
c
h
e
s
Fe
e
t
MW-17
HSA/AH
Davidson County - Holly Grove Landfills
Lexington, NC
Engineering Tectonics, P.A.
R. Barron
P. May
12/7/00 12/8/00
39.5
SS
SS
SS
12"
10"
0"
HSA
AH
SILTY SAND: Dry tan-orange fine silty sand w/
iron & manganese mottles
CLAYEY SILTY SAND: Slightly moist brown
clayey fine silty sand with iron & manganese
mottles and some light gray clay seams.
DIORITE: Competent diorite.
DIORITE: Competent diorite. Boring terminated at
39.5'.
17,34,37
11,13,17
50/0"
38.5
16:00
12/7/00
22.5
12/8/00
8:00
NA