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Soil and Groundwater Assessment Report Former Knitronics Facility
1515 W Academy Street
Cherryville, North Carolina H&H Job No. MOH-001
Table of Contents
1.0 Introduction and Background .............................................................................................. 1
2.0 Assessment Activities ............................................................................................................. 4
2.1 Soil Sampling Activities ...................................................................................................... 4
2.2 Groundwater Assessment Activities .................................................................................... 5
2.3 Quality Control .................................................................................................................... 7
2.4 Investigation Derived Waste ................................................................................................. 7
3.0 Analytical Results................................................................................................................... 8
3.1 Soil Sample Results ............................................................................................................. 8
3.2 Groundwater Levels and Flow Direction ............................................................................. 8
3.3 Groundwater Sample Results ............................................................................................... 9
3.4 Extent of Groundwater Impacts ......................................................................................... 10
3.5 Quality Control Results...................................................................................................... 11
4.0 Summary ............................................................................................................................... 12
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List of Tables
Table 1 Summary of Groundwater Elevation Measurements
Table 2 Summary of Soil Analytical Data
Table 3 Summary of Groundwater Analytical Data
List of Figures
Figure 1 Site Location Map
Figure 2 Site Vicinity and Water Supply Well Location Map
Figure 3 Site Map
Figure 4 Soil Sample Locations Map
Figure 5 Potentiometric Map – Shallow Wells (February 18, 2016)
Figure 6 Potentiometric Map – Deeper Wells (February 18, 2016)
Figure 7 Groundwater Impacts – Shallow Wells
Figure 8 Groundwater Impacts – Deeper Wells
List of Appendices
Appendix A Boring Logs and Well Construction Diagrams
Appendix B Laboratory Analytical Reports
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Soil and Groundwater Assessment Former Knitronics Facility
1515 W Academy Street
Cherryville, North Carolina H&H Job No. MOH-001
1.0 Introduction and Background
This report presents the methods and results of limited soil and groundwater assessment
activities at the former Knitronics facility located at 1515 W Academy Street, in Cherryville,
North Carolina. A site location map is provided as Figure 1. The facility building is on a parcel
approximately 12.13 acres in size. An adjacent parcel containing 4.64 acres consists of
undeveloped wooded land to the east of the facility building. Both of these parcels are owned by
Mohican Mills, Inc. via merger with Travis Knits, Inc. The facility contains a 197,000 sq ft
warehouse building built in 1971, which was formerly used as a textile dyeing mill. The
warehouse building is currently partially vacant and partially used for warehouse space.
In July 2015, Phase II Environmental Site Assessment soil and groundwater samples were
collected by others for a potential purchase to assess for subsurface impacts in the eastern portion
of the developed property. The results of the soil analyses indicated that tetrachloroethene (PCE)
was detected above the North Carolina Department of Environmental Quality (DEQ) Soil-to-
Groundwater Maximum Soil Contaminant Concentration (MSCC). Additionally, PCE,
trichloroethene (TCE), cis,1,2-dichloroethene (1,2-DCE), chromium, and lead were detected in
groundwater above the DEQ 15A NCAC 2L Groundwater Quality Standards (2L Standards).
PCE was detected in groundwater at concentrations up to 110,000 µg/l. The metal detections are
likely naturally occurring as there is no mention in the Phase II ESA report that care was taken to
collect low turbidity samples, and the samples were collected using a direct push technology
(DPT) rig.
In October and November 2015, Hart & Hickman, PC (H&H) completed a preliminary potential
receptor survey for the area near the former Knitronics facility. H&H identified 64 potential
water supply wells within the 0.5-mile search radius. Water supply wells used for drinking water
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are located west and south of the subject property. Water supply wells WSW-1 through WSW-5
were sampled in October 2015 with results submitted to NC DEQ and mailed to the water supply
well owners. No analyzed compounds were detected above laboratory reporting limits in these
water supply well samples. After reviewing the receptor survey and initial water supply well
results, DEQ requested that water supply wells WSW-17, WSW-18, WSW-31, WSW-32, WSW-
33, and WSW-34 be sampled. The additional water supply wells were sampled in November
2015 for target volatile organic compounds (VOCs). No analyzed compounds were detected
above laboratory reporting limits in the additional water supply well samples. The second round
of water supply well results were also submitted to NC DEQ and mailed to the water supply well
owners. A Site Vicinity Map depicting nearby water supply wells is provided as Figure 2. Areas
served by public water lines are also indicated on this figure. Additional documentation for the
receptor survey and water supply well sampling is provided in H&H’s Potential Receptor Survey
Report dated November 16, 2015 and H&H’s Water Supply Well Sampling Report dated
December 1, 2015.
The potential receptor survey identified vapor intrusion as a concern for the on-site building. On
November 5, 2015, subslab vapor (SSV) and indoor air assessment activities were completed by
H&H at the facility. Two SSV samples on the eastern end of the building contained PCE
concentrations above the NC DEQ Inactive Hazardous Sites Branch (IHSB) Non-Residential
Soil Gas Screening Level (SGSL) and one SSV sample on the eastern end of the building
contained TCE at a concentration above the Non-Residential SGSL. Four indoor air samples
collected in the central and eastern portion of the building contained PCE concentrations above
the NC DEQ IHSB Non-Residential Indoor Air and Crawlspace Screening Concentration
(IASL). These data indicate on-going volatilization of contaminants from the subsurface to the
indoor air. Only the western portion of the building is currently used and the eastern portion of
the building is vacant. The western portion of the building is used for warehousing purposes.
Based on the one indoor air dataset, a risk assessor with Hazardous Substance and Waste
Management Research, Inc. evaluated that data and concluded that the potential for increased
health risks from exposure to indoor air at the former Knitronics facility is low, particularly in
the active portion of the site. NC DEQ also conducted a Health Risk Evaluation and concluded
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that further assessment may be necessary (see January 22, 2016 letter from Mr. George Adams
of NC DEQ).
In the Notice of Request for Remedial Investigation letter dated January 19, 2016, DEQ IHSB
requested that a Remedial Investigation (RI) Work Plan for additional assessment activities be
submitted for the site. It is our understanding that Mohican has decided not to proceed with the
RI based on the history of the site. The assessment activities discussed in this report were
developed as an initial limited phase to better define the extent of soil and groundwater impacts
at the site and to assist in developing a Brownfields Agreement.
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2.0 Assessment Activities
2.1 Soil Sampling Activities
On January 28 and 29, 2016, H&H contracted with Geologic Exploration, Inc., as a NC Certified
Well Driller, to advance six soil borings at the site using a Direct Push technology (DPT) drill rig
or a hand auger. The soil boring locations are presented in Figure 4. The limited soil assessment
activities were intended to identify potential soil impacts in select areas. Other source areas may
be present on-site. Soil samples were collected from the following locations:
• Interior wastewater manhole/sewer line adjacent to a former “PCE washer” used by the
former Knitronics textile facility as reported by a former employee of the property
owner (SB-1).
• Reported location of former Knitronics PCE washer and certain dyeing machines
(SB-2 and SB-3).
• Former dyeing machine location (SB-4).
• Former exterior chemical tank containment area and wastewater sewer junction box
located near the loading dock (SB-5).
• Former aboveground fuel oil storage tank (AST) containment area adjacent to the
location where a PCE AST was reported by an employee of the property owner (SB-6).
During sampling, the recovered soil was screened in the field for the presence of odors, staining,
and/or elevated photoionization detector (PID) readings. Based on elevated field screening
readings, soil samples for laboratory analysis were collected at the following intervals: SB-1 at
7-9 feet (ft) below ground surface (bgs); SB-2 at 15-17 ft bgs and 25 to 27 ft bgs; SB-3 at 7-9 ft
bgs; SB-4 at 5-7 ft bgs and 27 to 30 ft bgs; SB-5 at 9-11 ft bgs and 25 to 27 ft bgs; and SB-6 at
7-10 ft bgs. These depths were based on field screening results and the anticipated depths of
subsurface features and/or likely depth of impacts associated with the building. Soil boring logs
are included in Appendix A.
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The soil samples collected from each boring were analyzed for VOCs by EPA Method 8260. In
addition, shallow soil samples collected from SB-1 through SB-5 were analyzed for Hazardous
Substance List (HSL) Metals by EPA Method 6010C/7471B and semi-volatile organic
compounds (SVOCs) by EPA Method 8270. The samples were collected into laboratory
supplied sample containers, placed on ice in a cooler, and sent to Prism Laboratories, Inc (Prism)
for analysis using standard chain of custody protocol.
Following boring advancement and sample collection, the soil borings were abandoned with
bentonite grout, and the surfaces were patched with concrete.
2.2 Groundwater Assessment Activities
On January 25 through February 5, 2016, five permanent shallow groundwater monitoring wells
(MW-1, MW-2, MW-3S, MW-4S, and MW-5S) and four permanent deep monitoring wells
(MW-2D, MW-3D, MW-4D, and MW-5D) were installed at the site to help define the extent of
shallow and deeper groundwater impacts. Prior to well installation activities, H&H obtained a
well permit from Gaston County Health Department.
The shallow wells were installed using a hollow stem auger (HSA) and the deep wells were
installed using HSA, air rotary, and mud rotary drilling techniques. During well installation, a
stainless steel split-spoon soil sampler was utilized at five-to ten foot intervals (above rock) for
lithology review and for field screening for the presence of odors, staining, and/or elevated PID
readings. Soil boring logs and well construction logs are included in Appendix A. The locations
of the monitoring wells are presented in Figure 3.
Apart from the source area shallow well MW-3S, the shallow monitoring wells were constructed
with two-inch diameter PVC riser with 15 feet of 0.010-inch slotted screen installed to bracket
the water table. The shallow wells depths ranged from 28 to 37 ft bgs. Due to the high
concentrations of PCE near the source area (>100,000 ppb), MW-3S was constructed using a
galvanized steel riser and well screen.
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The deep monitoring wells were constructed of two-inch diameter PVC casing with 5 to 10 feet
of 0.010-inch slotted screen installed to interface the first water bearing zone in partially
weathered rock (PWR). With the exception of MW-3D, the deep wells were constructed with a
6-inch diameter outer PVC casing set into PWR. Due to potential high PCE concentrations near
the source area, the outer casing for MW-3D was constructed of galvanized steel. Surface casing
depths are provided in Table 1. The depth to partially weathered rock as determined by hollow-
stem auger refusal ranged from 55 ft bgs (MW-4D) to 105 ft bgs (MW-2D).
Site wells located in asphalt or grass were completed at the surface with locking flushed-
mounted steel vaults. Wells located in wooded areas were completed with locking steel stick-up
vaults. After installation, the well top-of-casing elevations were estimated using surveying
techniques in order to develop shallow and deep groundwater contour maps. Monitoring well
latitude/longitude coordinates were also mapped using a Trimble GPS unit. Top-of-casing
elevations and latitude/longitude coordinates are presented in Table 1.
Following installation, the monitoring wells were developed using standard protocols. Prior to
sample collection, the monitoring wells were purged with dedicated bailers or pump until pH,
temperature, and conductivity field measurements stabilized. Groundwater samples collected
from the monitoring wells were labeled and shipped under standard chain-of-custody procedures
to Prism for analysis of VOCs by EPA Method 8260.
To evaluate prior metal detections in groundwater, the source area shallow monitoring well
(MW-3S) also was sampled for Resource Conservation and Recovery Act (RCRA) metals by
EPA Method 6010C/7470A after attempting to reduce turbidity levels below 10 NTU using low
flow purging techniques with a submersible pump. The lowest turbidity level that H&H could
achieve for MW-3S was 18.6 NTUs, which is slightly above the EPA recommended turbidity
value of 10 NTU.
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2.3 Quality Control
For quality control purposes, one duplicate soil sample was collected from SB-5 (9-11’) and
analyzed for VOCs by EPA Method 8260, SVOCs by EPA Method 8270, and HSL Metals by
EPA Method 6010C/7471B. Additionally, one duplicate groundwater sample was collected
from MW-3D and analyzed VOCs by EPA Method 8260. The duplicate samples were collected
to allow determination of analytical repeatability. H&H also submitted one laboratory-prepared
trip blank sample (Trip Blank) and one field blank sample (Field Blank) for laboratory analysis
of VOCs by EPA Method 8260.
2.4 Investigation Derived Waste
Due to elevated compound concentrations near the source area, soil cuttings and
development/purge water generated during the installation and sampling of soil borings SB-1
through SB-6 and near source area shallow and deep wells MW-3S and MW-3D were
containerized in 55-gallon drums. Soil cuttings from the remaining wells were spread in the
vicinity of the wells. Development and purge water generated during the installation and
sampling of the monitoring wells were containerized in 55-gallon drums. Composite samples
were collected from the drum materials for waste disposal purposes. The investigation derived
waste (IDW) drums will be profiled and properly disposed at permitted facilities.
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3.0 Analytical Results
3.1 Soil Sample Results
The results of the limited soil assessment activities indicate widespread low level PCE soil
impacts were detected in each assessed area. Impacts were detected below the floor of the
former dyehouse and also outside the eastern portion of the building. PCE was detected in the
soil samples SB-1 through SB-6 at concentrations above its IHSB Preliminary Soil Remediation
Goals (PSRGs) for Protection of Groundwater of 0.005 mg/kg (IHSB PSRG Table, September
2015). The concentrations of PCE ranged from 0.056 mg/kg (SB-6) to 57 mg/kg (SB-1). The
Residential PSRG for PCE (32 mg/kg) was also exceeded in SB-1. Additionally, 1,1,1,2-
tetrachloroethane (1,1,1,2-TCA) was detected in SB-1 (7-9’) and SB-5 (25-27’) at concentrations
above its Protection of Groundwater PSRG of 0.0059 mg/kg, but below its Residential PSRG of
2 mg/kg. No other VOCs were detected above their respective PSRGs.
No SVOC or metal impacts were detected in the soil samples, although metals consistent with
naturally occurring levels were detected. Based on these results, SVOCs and metals are not
considered to be constituents of concern for this site.
The analytical results are summarized on Table 2 and analytical detections in soil are shown on
Figure 4. The soil laboratory report along with chain-of-custody are included in Appendix B.
3.2 Groundwater Levels and Flow Direction
Water levels in site monitoring wells were gauged using an electronic water level meter on
February 9, 2016 (Table 1). After allowing ample time for water levels to reach static
equilibrium, water levels were again gauged on February 18, 2016. The estimated
potentiometric surface maps for the shallow and deeper aquifers for the February 2016
groundwater elevation data are presented in Figures 5 and 6, respectively. The groundwater flow
directions in the shallow (saprolite) and deeper (PWR) aquifers are generally to the east toward
an unnamed tributary of Muddy Fork Creek located approximately 700 ft southeast of the
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southeast corner of the site. The easterly flow direction is away from the locations of properties
with drinking water supply wells.
3.3 Groundwater Sample Results
The laboratory analytical results for the shallow wells indicated PCE was detected in MW-1 (97
µg/L), MW-2S (7.0 µg/L), MW-3S (120,000 µg/L), MW-4S (17 µg/L), and MW-5S (11 µg/L)
above its 2L Groundwater Standard of 0.7 µg/L. TCE (260 µg/L) and cis-1,2-DCE (140 µg/L)
were also detected in MW-3S at concentrations above the 2L Groundwater Standards of 3 µg/L
and 70 µg/L, respectively. No other compounds were detected above 2L Groundwater Standards
in the shallow monitoring wells.
Because of the detection of PCE in the upgradient monitoring well MW-1, this well was
resampled on February 18, 2016 to confirm the PCE concentration detected in this well on
February 5, 2016. Prior to sample collection, the monitoring well was thoroughly purged with a
dedicated bailer. Approximately thirty gallons of water were purged from the well. PCE was
detected in the sample at a concentration of 16 µg/L which is below but on the same order of
magnitude as the February 5, 2016 concentration. The presence of PCE in the upgradient well
may be related to the off-site property to the west, which was formerly occupied by a textile
operation.
Using low turbidity sampling methods, no RCRA metals were detected above the 2L
Groundwater Standards in near source area monitoring well MW-3S. Based on these results, the
metals detected by others during the July 2015 sampling event were not confirmed, and the prior
metal detections in groundwater are attributed to samples that were collected without attention to
turbidity.
The laboratory analytical results for the PWR (deeper aquifer) wells indicated PCE was detected
in MW-3D (460 µg/L), MW-4D (95 µg/L), and MW-5D (1,700 µg/L) above its 2L Groundwater
Standard. Additionally, TCE was detected in MW-3D (8.4 µg/L) and MW-5D (5.5 µg/L) above
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its 2L Groundwater Standard. No other compounds were detected above 2L Groundwater
Standards in the deeper wells.
PCE concentrations in monitoring wells MW-1 (2/5/16 sample), MW-3S, MW-3D, MW-4D, and
MW-5D exceeded its DEQ Division of Waste Management (DWM) Residential and Non-
Residential Vapor Intrusion Groundwater Screening Levels (GWSLs) of 48.4 µg/L and 11.5
µg/L. The PCE concentration in downgradient shallow well MW-4S only exceeds the
Residential GWSL. Additionally, the TCE concentration detected in MW-3S, MW-3D, and
MW-5D exceeded its Residential and Non-Residential GWSLs. There are no GWSLs specified
for cis-1,2-DCE.
Vapor intrusion sampling and risk calculations for the on-site building were addressed in H&H’s
Sub-Slab/Indoor Air Assessment report dated December 16, 2015. No buildings are currently
located within 500 ft downgradient of the well pairs MW-4S/D and MW-5S/D which are located
near the downgradient property line. In addition, PCE levels in shallow groundwater near the
downgradient property line are close to or below residential GSWLs. Additionally, Residential
GWSLs were not exceeded in the cross-gradient wells MW-2S and MW-2D, which are situated
between the site building and residences to the south. Based on these results, the potential for a
vapor intrusion risk to off-site properties is considered to be low.
Groundwater sample results are summarized on Table 3. Groundwater analytical concentrations
detected in the shallow and deeper monitoring wells are shown on Figures 7 and 8, respectively.
The groundwater laboratory report along with chain-of-custody are included in Appendix B.
3.4 Extent of Groundwater Impacts
The horizontal and vertical extent of groundwater impacts was not defined by this assessment
work. PCE was detected above its groundwater standard in both shallow (saprolite) groundwater
and deeper (PWR) groundwater. Low concentrations were detected in upgradient shallow
groundwater (MW-1) and cross-gradient shallow groundwater (MW-2S). The detection of PCE
in the upgradient monitoring well may indicate an off-site source of PCE to the west of the site.
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Importantly, no PCE impacts were detected in the PWR well MW-2D which is situated between
the source area and off-site bedrock water supply wells to the south. Relatively higher levels of
PCE in shallow and deeper groundwater extend downgradient and likely beyond the property
limits in the east and southeast directions.
Source area PCE concentrations (120,000 µg/L) are relatively high in shallow groundwater just
east of the facility building. Groundwater impacts have migrated from the source area in a
hydraulically downgradient direction to the east and southeast. The highest downgradient
concentration is 1,700 µg/L in PWR well MW-5D. These concentrations compare to the
groundwater standard for PCE of 0.7 µg/L. Monitoring well MW-5D is situated approximately
500 ft downgradient of the source area. The relatively higher PCE levels in the deeper well of
the MW-5S/D well pair indicates that PWR is likely a more transmissive zone in the area which
is common in the Piedmont. In addition, because MW-5D is slightly cross-gradient of the flow
direction based on the potentiometic surface, the impacts may be moving by fracture controlled
flow and under the influence of the stream to the southeast.
3.5 Quality Control Results
The quality control sample results indicate good quality datasets were collected. The soil and
groundwater duplicate sample results were similar to the original samples. No constituents were
detected in the field blank or trip blank samples at concentrations above the laboratory reporting
limits. Duplicate, field blank, and trip blank sample results are summarized in Tables 2 and 3.
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4.0 Summary
H&H completed limited soil and groundwater sampling activities at the former Knitronics
facility located in Cherryville, North Carolina. The assessment activities included the collection
of nine soil samples from six soil borings, and the installation and sampling of nine permanent
groundwater monitoring wells. The results of the assessment activities are summarized below.
• VOC impacts were detected in each soil sample collected and the primary VOC detected
was PCE. PCE was detected in the nine soil samples at concentrations above the PSRGs
for Protection of Groundwater. Additionally, the Residential PSRG for PCE was also
exceeded one soil sample. The Industrial PSRG for PCE was not exceeded in the
analyzed soil samples. The extent of soil impacts is not defined and other source areas
may be present.
• No SVOC or metal impacts were detected in the soil samples. These compounds are not
considered to be constituents of concern for the site.
• PCE was detected at concentrations exceeding its 2L Groundwater Standard in five
shallow monitoring wells and three deeper monitoring wells. Compound concentrations
in two shallow monitoring wells and three deeper monitoring exceeded Non-Residential
Vapor Intrusion GWSLs. The extents of shallow and deeper groundwater impacts are not
defined and appear to be migrating off-site to the east and southeast. PCE detected in
upgradient well MW-1 may indicate the existence of an upgradient off-site source.
• The shallow and deeper groundwater flow direction is to the east which is away from the
drinking water supply wells.
• No RCRA metals were detected above the 2L Groundwater Standards in near source area
monitoring well MW-3S and metals are not considered to be constituents of concern for
site groundwater.
Table 1 (Page 1 of 1) Hart & Hickman, PC
Table 1
Summary of Groundwater Elevation Measurements
Former Knitronics Facility
Cherryville, North Carolina
H&H Job No. MOH-001
Monitoring
Well ID
MW-1 35 Saprolite N/A 20-35 900.00 866-881 35.36882513 -81.40399212 29.83 870.17 29.63 870.37
MW-2S 33 Saprolite N/A 20-35 894.99 860-875 35.36862052 -81.40202866 26.19 868.80 26.18 868.81
MW-2D 120 PWR 105 115-120 894.74 775-780 35.36861309 -81.40206154 25.55 869.19 25.45 869.29
MW-3S 37 Saprolite N/A 22-37 894.34 858-873 35.36987441 -81.40084700 30.76 863.58 30.49 863.85
MW-3D 102 PWR 92 97-102 893.90 792-797 35.36975209 -81.40052283 30.22 863.68 29.90 864.00
MW-4S 28 Saprolite N/A 13-28 883.46 852-867 35.37057144 -81.39922473 21.21 862.25 21.23 862.23
MW-4D 67 PWR 56 57-67 883.37 813-823 35.37055682 -81.39921518 21.39 861.98 21.43 861.94
MW-5S 28 Saprolite N/A 13-28 883.18 852-867 35.36914936 -81.39925070 20.70 862.48 20.75 862.43
MW-5D 84 PWR 74 79-84 883.04 796-801 35.36915859 -81.39925809 20.87 862.17 20.80 862.24
Notes:TOC = Top of PVC well casing; DTW = Depth to water from TOC
ft bgs = Feet below ground surface; MSL = mean sea level; N/A = Not ApplicableMW-1 through MW-3D were constructed with lockable flush-mounted well pads
MW-4S through MW-5D constructed with lockable steel stick-up covers
TOC measurements completed by H&H on February 9, 2016TOC elevation referenced to estimated location of 900 ft msl topograohic contour
February 18, 2016
Total Depth
(ft bgs)
Screened
Interval (ft bgs)
TOC Elevation
(ft msl)
Groundwater
Elevation (ft msl)
Approximate
Screened
Interval
(ft msl)
Lithology
of
Screened
Interval
DTW (ft)
February 9, 2016
DTW (ft)
Groundwater
Elevation (ft msl)
Latitude LongitudeSurface
Casing Depth (ft bgs)
Table 2
Summary of Soil Analytical Data
Former Knitronics Facility
Cherryville, North Carolina
H&H Job No. MOH-001
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3/10/2016
Table 2 (Page 1 of 1)
Hart & Hickman, PC
Sample Location
Adjacent to
Wastewater
Manhole
Adjacent to
Former PCE
Washer Area
Adjacent to
Former PCE
Washer Area
Adjacent to
Former PCE
Washer Area
East Portion
Near Former
Dye Area
East Portion
Near Former
Dye Area
Near Exterior
Loading Dock
Near Exterior
Loading Dock
Near Exterior
Loading Dock
AST
Containment
Area
Sample ID SB-1 7-9'SB-2 15-17'SB-2 25-27'SB-3 7-9'SB-4 5-7'SB-4 27-30'SB-5 9-11'Dup-1
(SB-5 9-11')SB-5 25-27'SB-6 7-10
Depth (ft bgs)7-9 15-17 25-27 7-9 5-7 27-30 9-11 9-11 25-27 7-10
Sample Date 1/28/2016 1/28/2016 1/28/2016 1/28/2016 1/28/2016 1/28/2016 1/29/2016 1/29/2016 1/29/2016 1/29/2016 Protection of
Groundwater Residential Industrial Range Mean
Units (mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)
VOCs (8260B)
Acetone <0.072 0.099 0.083 0.067 <0.066 <0.062 <0.064 <0.082 <0.057 <0.061 24 12,000 100,000 NS NS
1,1,1,2-Tetrachloroethane 0.020 <0.0089 <0.0082 <0.0059 <0.0066 <0.0062 <0.0064 <0.0082 0.0086 <0.0061 0.0059 2.0 8.8 NS NS
1,2,3-Trichlorobenzene 0.11 <0.0089 <0.0082 <0.0059 <0.0066 <0.0062 <0.0064 <0.0082 0.0064 <0.0061 NS 13 190 NS NS
1,2,4-Trichlorobenzene 0.11 <0.0089 <0.0082 <0.0059 <0.0066 <0.0062 <0.0064 <0.0082 0.013 <0.0061 2.2 12 52 NS NS
1,2-Dichlorobenzene 0.013 <0.0089 <0.0082 <0.0059 <0.0066 <0.0062 <0.0064 <0.0082 <0.0057 <0.0061 0.24 360 380 NS NS
1,4-Dichlorobenzene 0.0094 <0.0089 <0.0082 <0.0059 <0.0066 <0.0062 <0.0064 <0.0082 <0.0057 <0.0061 0.070 2.6 11 NS NS
Chlorobenzene 0.0076 <0.0089 <0.0082 <0.0059 <0.0066 <0.0062 <0.0064 <0.0082 <0.0057 <0.0061 0.44 56 260 NS NS
cis-1,2-Dichloroethene <0.0072 <0.0089 0.017 0.041 0.013 0.024 <0.0064 <0.0082 0.0078 <0.0061 0.36 32 460 NS NS
Tetrachloroethene 57 5.4 0.92 7.1 1.8 2.9 0.072 0.049 1.9 0.056 0.0050 16 78 NS NS
Trichloroethene 0.0090 <0.0089 <0.0082 0.0078 <0.0066 <0.0062 <0.0064 <0.0082 0.012 <0.0061 0.018 0.82 3.8 NS NS
SVOCs (8270C)
SVOC Analytes BRL BRL NA BRL BRL NA BRL BRL NA NA ---------------
HSL Metals (6010C/7471B)
Antimony 3.9 <0.38 NA <0.36 <0.33 NA <0.30 <0.40 NA NA 0.9 6.2 94 <1.0 - 8.8*0.76
Arsenic 2.7 1.5 NA 5.0 4.6 NA 5.5 7.7 NA NA 5.8 0.68 3 1.0 - 18 4.80
Beryllium <0.36 0.58 NA 0.59 0.97 NA 1.5 2.4 NA NA 63 32 460 ND-2.0 0.11
Chromium 16 6.0 NA 20 41 NA 32 42 NA NA 360,000 24,000 100,000 7.0-300 65
Copper 27 3.5 NA 14 40 NA 38 60 NA NA 700 620 9,400 3.0-100 34
Lead 11 42 NA 30 14 NA 30 42 NA NA 270 400 800 ND - 50 16
Manganese 99 570 NA 21 31 NA 78 240 NA NA 65 360 5,200 8.0-3,394 594
Mercury <0.026 <0.028 NA 0.036 0.036 NA <0.026 <0.030 NA NA 1 1.9 3.1 0.03-0.52 0.121
Nickel 4.3 20 NA 10 6.3 NA 6.2 8.5 NA NA 130 300 4,400 ND-150 23
Silver <0.36 <0.38 NA 0.37 0.66 NA 0.49 0.85 NA NA 3.4 78 1,200 ND - 5.0 NS
Zinc 25 14 NA 14 21 NA 36 45 NA NA 1,200 4,600 70,000 500-50,000 7,800
Notes:
1) NC DEQ Inactive Hazardous Sites Branch (IHSB) Protection of Groundwater and Residential and Industrial Health Based Preliminary Soil Remediation Goals (PSRGs) - September 2015Range and Mean background values for North Carolina or Southeast soils taken from Elements in North American Soils by Dragun and Chekiri, 2005
* = Range and mean values of background metals for Southeastern USA soils.
Method number follows parameter in parenthesis
Bold concentration indicates exceedance of IHSB Protection of Groundwater PSRG (or exceedance of an IHSB PSRG and Background Range in the case of metals)Bold and highlighted concentration indicates exceedance of IHSB Residential PSRGVOCs = volatile organic compounds; SVOCs = semi-volatile organic compounds; HSL = Hazardous Substance List
NA = Not Analyzed; BRL = Below Laboratory Reporting Limit; --- = Not Applicable; NS = Screening Criteria Not Specified
IHSB PSRGs1
Screening Criteria
Background*
Table 3Summary of Groundwater Analytical Data
Former Knitronics FacilityCherryville, North Carolina
H&H Job No. MOH-001
S:\AAA-Master Projects\Mohican Mills - MOH\MOH-001 Knitronics\SoilGWAssessment\GWSoil Table3/10/2016
Table 3 (Page 1 of 1) Hart & Hickman, PC
Sample ID MW-2S MW-2D MW-3S MW-3D Dup-1 (MW-3D)MW-4S MW-4D MW-5S MW-5D Field Blank
Sample Date 2/5/2016 2/18/2016 2/5/2016 2/5/2016 2/5/2016*2/5/2016 2/5/2016 2/5/2016 2/5/2016 2/5/2016 2/5/2016 2/5/2016
Units (µg/L)(µg/L)(µg/L)(µg/L)(µg/L)(µg/L)(µg/L)(µg/L)(µg/L)(µg/L)(µg/L)(µg/L)(µg/L)(µg/L)
VOCs (8260B)Acetone <5.0 <5.0 <5.0 <5.0 <500 <5.0 <5.0 <5.0 6.7 <5.0 <50 <5.0 6,000 4,520,000 19,000,000
Chloroform <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 0.62 <0.50 <0.50 <5.0 <0.50 70 8.14 35.5
cis-1,2-Dichloroethene <0.50 <0.50 <0.50 <0.50 140 1.2 1.2 <0.50 <0.50 <0.50 <5.0 <0.50 70 NS NSTetrachloroethene97167.0 <0.50 120,000 460 450 17 95 11 1,700 <0.50 0.7 11.5 48.4
Toluene <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <0.50 2.2 <0.50 <5.0 <0.50 600 3,840 16,100
Trichloroethene <0.50 <0.50 <0.50 <0.50 260 8.4 8.4 <0.50 <0.50 <0.50 5.5 <0.50 3 1.04 4.35Trichlorofluoromethane<0.50 <0.50 <0.50 3.7 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 2,000 36.8 155
RCRA Metals (6010C/7470A)Mercury NA NA NA NA <0.20 NA NA NA NA NA NA NA 1 NS NSArsenicNANANANA<10 NA NA NA NA NA NA NA 10 NS NS
Barium NA NA NA NA 25 NA NA NA NA NA NA NA 700 NS NSCadmiumNANANANA<1.0 NA NA NA NA NA NA NA 2 NS NSChromiumNANANANA<5.0 NA NA NA NA NA NA NA 10 NS NS
Lead NA NA NA NA <5.0 NA NA NA NA NA NA NA 15 NS NSSeleniumNANANANA<20 NA NA NA NA NA NA NA 20 NS NSSilverNANANANA<5.0 NA NA NA NA NA NA NA 20 NS NS
Notes:
Only those compounds detected in at least one sample shown above
1) 15A North Carolina Administrative Code 2L Groundwater Standards
2) Division of Waste Management Residential and Non-Residential Vapor Intrusion Groundwater Screening Levels* - RCRA Metals collected from MW-3S on 2/9/16
Bold indicates an exceedance of the NCAC 2L Standard
Bold Italic indicates an exceedance of the NCAC 2L Standard and the Division of Waste Management Residential Vapor Intrusion Groundwater Screening Level.
Bold Italic and highlighted indicates an exceedance of NCAC 2L Standard and the Division of Waste Management Residential and Non-Residential Vapor Intrusion Groundwater Screening Levels.
Method number follows parameter in parenthesis
VOCs = volatile organic compounds; RCRA = Resource Conservation and Recovery Act; NS = screening criteria not specified; NA = Not Analyzedµg/L = micrograms per liter
15A NCAC 2L1
DWM VI Non-Residential Groundwater Screening
Level2
Screening Critera
MW-1
DWM VI Residential Groundwater Screening
Level2
SITE
0 2000 4000
APPROXIMATE
SCALE IN FEET
N
U.S.G.S. QUADRANGLE MAP
QUADRANGLE
7.5 MINUTE SERIES (TOPOGRAPHIC)
WACO, NORTH CAROLINA, 1976
TITLE
PROJECT
SITE LOCATION MAP
FORMER KNITRONICS
1515 WEST ACADEMY STREETCHERRYVILLE, NC
DATE:
JOB NO:
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FIGURE:
3-8-16 0
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GROUNDWATERIMPACTS DETECTED
2923 South Tryon Street-Suite 100Charlotte, North Carolina 28203704-586-0007(p) 704-586-0373(f)License # C-1269 / #C-245 Geology
JOB NO. MOH-001
REVISION NO. 0DATE: 3-8-16
FIGURE NO. 2
FORMER KNITRONICS FACILITY
1515 WEST ACADEMY STREET
CHERRYVILLE, NC
SITE VICINITY AND WATER SUPPLY WELL
LOCATION MAPLEGEND
SITE PROPERTY BOUNDARY
WATER SUPPLY WELL OBSERVED
CITY WATER NOT AVAILABLE;
SUPPLY WELL LOCATION UNKNOWN
PROPERTY ON CITY WATER;SUPPLY WELL NOT USED
CITY WATER AVAILABLE ON STREET
APPENDIX A
Boring Logs and Well Construction Diagrams
APPENDIX B
Laboratory Analytical Reports
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