WS-4653_15063_CA_MRP_20160909

GROUNDWATER MONITORING REPORT
WILLIAMS GROCERY, INCIDENT #15063
2425 US HIGHWAY 21
HAMPTONVILLE, YADKIN CO., NC
S&ME PROJECT # 4305-14-239B
SEPTEMBER 9, 2016
Prepared For:
North Carolina Department of Environmental Quality
Division of Waste Management
Underground Storage Tank Section
1646 Mail Service Center
Raleigh, North Carolina 27699-1646
Prepared by:
S&ME, Inc.
44 Buck Shoal Road, Suite C-3
Arden, North Carolina 28704
__________________________________________________________
Bradley S. Keyse, E.I.David R. Loftis, P.E.
Staff Professional Project Manager
S&ME is licensed to practice geology/engineering in North Carolina. Geology License Certification #C-145 and
S&ME, Inc. Engineering License Certification No. F-0176
Groundwater Monitoring Report, Williams Grocery. #15063 S&ME Project No. 4305-14-239B
2425 US Highway 21, Hamptonville, North Carolina September 9, 2016
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TABLE OF CONTENTS
1.STATE-LEAD MONITORING REPORT.............................................................. 1
2.EXECUTIVE SUMMARY....................................................................................... 2
3.SCOPE OF SERVICES ............................................................................................ 5
3.1 Contract Information........................................................................................... 5
3.2 Approved Scope of Services............................................................................... 5
4.SITE HISTORY AND CHARACTERIZATION................................................... 6
4.1 UST Owner and Operator Information............................................................... 8
4.2 UST Information................................................................................................. 8
4.3 Description of the UST Release.......................................................................... 8
4.4 Site Characteristics.............................................................................................. 8
4.5 Owners and Occupants of Adjoining/Nearby Properties and Land Use............. 9
4.6 Receptors/Potential Receptor Information.......................................................... 9
5.CURRENT SITE ASSESSMENT INFORMATION........................................... 11
5.1 Air Sparge Well Installation............................................................................. 11
5.2 Free Product Investigation/Recovery................................................................ 11
5.2.1 Free Product Investigation...................................................................11
5.2.2 MMPE Event.......................................................................................11
5.3 Air Sparge Summary......................................................................................... 12
5.4 Current Liquid Levels....................................................................................... 13
5.5 Groundwater Monitoring Events ...................................................................... 13
5.6 Summary of Groundwater and Free Product Assessment Information............ 14
5.7 Regional and Site Geology and Hydrogeology ................................................ 14
5.7.1 Soil and Bedrock .................................................................................14
5.7.2 Hydrogeology......................................................................................14
5.8 Evaluation of Soil, Groundwater, and Free Product Assessment Information. 14
5.8.1 Current Extent and Severity of Contamination...................................14
5.8.2 Cleanup Levels Achieved....................................................................15
6.CONCLUSIONS AND RECOMMENDATIONS ................................................ 16
FIGURES
Figure 1 Topographic Map
Figure 2 Site Plan
Figure 3 Water Supply Well Location Map
Figure 4 Groundwater Quality Map
Groundwater Monitoring Report, Williams Grocery. #15063 S&ME Project No. 4305-14-239B
2425 US Highway 21, Hamptonville, North Carolina September 9, 2016
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TABLES
Table 1 Water Supply Well Information
Table 2 Adjacent Property Owner Information
Table 3 Water Supply Well Information
Table 4 Monitoring Well Construction and Groundwater Level Data
Table 5A Historical and Current Groundwater Analytical Results
Table 5B Historical and Current Groundwater Analytical Results (Continued)
Table 5C Historical and Current Groundwater Analytical Results (Continued)
APPENDICES
Appendix I Well Construction Log and Record
Appendix II MMPE/Air Sparge Report
Appendix IV Field Forms
Appendix IV Laboratory Report
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2425 US Highway 21, Hamptonville, North Carolina September 9, 2016
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2.EXECUTIVE SUMMARY
On May 31, 2016, S&ME installed permanent air sparging well identified as AS-1 to a
depth of 45 feet below ground surface (bgs). From June 20, 2016 to June 24, 2016, a 96-
hour mobile multi-phase extraction (MMPE) event was performed on monitoring wells
MW-1, MW-3, and recovery well RW-1 coupled with simultaneous air sparging at air
sparge well AS-1. Prior to the MMPE event, on June 20, 2016, free product was not
detected in monitoring wells MW-1 and MW-3; however, free product was measured
recovery well RW-1 at a thickness of 0.01 feet. A total of 4,689 gallons of product/water
mix was recovered via MMPE activities. The MMPE contractor reported that
approximately 15 gallons of measurable free product was recovered as liquid.
Based on the recorded vapor emissions, approximately 1,446 pounds of vapor phase
hydrocarbons were removed, which corresponds to approximately 235 gallons of volatile
organic compounds (VOCs) (as gasoline). Thus, an equivalent of approximately 250
gallons of product was recovered as liquid and vapor. Based on the a review of past and
the more recent MMPE event data, in instances where the free product thicknesses in
monitoring wells are relatively low, the use of air sparging while performing MMPE
tends to be more effective at contaminant removal as VOC vapor emissions remain
elevated throughout the event, ultimately decreasing the cost per gallon of recovered
hydrocarbons.
On July 21, 2016, S&ME was on site to gauge depth-to-water and collect groundwater
samples from monitoring wells MW-1, MW-3, and RW-1. Free product was detected in
monitoring wells MW-1 at a thickness of 0.23 feet. Free product was not detected in
monitoring well MW-3 or recovery well RW-1. After purging each well, a groundwater
sample was collected from monitoring well MW-3 and recovery well RW-1 for analysis
of VOCs by SM 6200B.
The groundwater analytical results from the monitoring well MW-3 and recovery well
RW-1 indicated concentrations of benzene, 1,2- dibromoethane (EDB), and/or 1,2-
dichloroethane, greater than the corresponding GCLs. Target analytes, including but not
limited to, methyl tert-butyl ether (MTBE), naphthalene, toluene, 1,2,4-trimethylbenzene,
1,3,5-trimethlybenzene, and total xylenes were detected in monitoring well MW-3 and/or
recover well RW-1 at concentrations greater than the corresponding 2L Standards, but
less than the GCLs. The data suggests obvious reductions in the dissolved contaminant
concentrations in monitoring well MW-3 and recovery well RW-1 following the MMPE
and air sparging event.
1.Free product thickness:
Maximum thickness (ft):0.23
Monitor well:MW-1
Date:July 21, 2016
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2.Maximum concentrations of groundwater contaminants and 2L Standards:
Contaminant
2L
Standard
(µg/L)
Concentration
(µg/L)Well ID Date
Benzene 1 17,000 RW-1 7/21/16
n-Butylbenzene 70 320 MW-3 7/21/16
n-Butylbenzene 70 70 MW-3 7/21/16
1,2-Dibromoethane 0.02 850 MW-3 7/21/16
1,2- Dichloroethane 0.4 670 RW-1 7/21/16
Isopropylbenzene 70 260 MW-3 7/21/16
2-Hexanone 40 1,800 MW-3 7/21/16
Methyl tert-butyl ether 20 2,100 RW-1 7/21/16
Diisopropyl ether 70 300 RW-1 7/21/16
Ethylbenzene 600 3,500 MW-3 7/21/16
n-Propylbenzene 70 630 MW-3 7/21/16
Naphthalene 6 2,200 MW-3 7/21/16
Toluene 600 31,000 MW-3 7/21/16
1,2,4-Trimethylbenzene 400 5,000 MW-3 7/21/16
1,3,5-Trimethylbenzene 400 1,400 MW-3 7/21/16
Xylenes (total)500 19,400 MW-3 7/21/16
3.Current extents of free product and dissolved groundwater contamination and
compare to the historical extents:
Based on the July 2016 sampling events, contaminant concentrations have
generally decreased in monitoring well MW-3 and recovery well RW-1, when
compared to the previous data from February 2014.
The extent of free product appears to be limited to the area in the vicinity of MW-
1 at a thickness of 0.23 feet. Free product was not detected in the site’s
monitoring wells in February 2014 but was previously detected in June 2012 at a
thickness of 0.01 feet.
4.Potential receptors and risk of impact (list by receptor ID as appropriate):
Distance
from source
(ft)
Municipal
Water
Available
Active
Drinking
Water Well
Inactive
Drinking
Water Well
Irrigation
Well
Surface
Water
Body
0 – 500 No 5 0 0 0
500 – 1000 No 7 0 0 0
1000 - 1500 No 6 0 0 0
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5.Indicate possible pathway to closing the UST Incident.
a)Pursue a municipal water connection to the properties within 1,000 feet of
the subject property that utilize water supply wells as a drinking source. The
nearest municipal water source is approximately 1.75 miles north of the
subject property. Due to the distance to the municipal water system, this
option is cost prohibitive.
b)Remove free product from the groundwater.
c)Remediate the dissolved groundwater contamination to concentrations below
the GCLs.
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2425 US Highway 21, Hamptonville, North Carolina September 9, 2016
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3.SCOPE OF SERVICES
3.1 Contract Information
The scope of services for this report was performed in general accordance with S&ME’s
proposal number 43-1400903B, dated April 21, 2016. The scope of services was
authorized by the North Carolina Department of Environmental Quality (NCDEQ’s) Task
Authorization (TA)-3 dated April 22, 2016 and NCDEQ TA-3A dated May 3, 2016, and
within contract number N14005i.5
3.2 Approved Scope of Services
S&ME’s approved Scope of Services for this Task Authorization included the installation
of one 2-inch diameter air spare (AS) well to a depth of 45 feet bgs, perform a mobile
multi-phase extraction (MMPE) on up to three monitoring wells (MW-1, MW-3, and
RW-1), perform an air sparging event on the newly installed air sparge well AS-1 during
the 96-hour MMPE event, perform free product measurements and sample monitoring
wells MW-1 and MW-3 and recovery well RW-1 if the product thickness in less than
one-eighth of an inch.
These services were completed as proposed; with the exception that monitoring well
MW-1 was not sampled due to the presence of free product in excess of 0.01 feet.
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4.SITE HISTORY AND CHARACTERIZATION
Petroleum impacts were confirmed during the removal of one 2,000- gallon gasoline and
one 500-gallon kerosene underground storage tanks (USTs) during February 1994, based
on the analytical results of soil samples collected during UST closure activities. Each
sample collected during closure activities were reported to contain total petroleum
hydrocarbons (TPH) with concentrations ranging from 42 parts per million (ppm) as
gasoline range organics to 25,000 ppm as gasoline and diesel range organics. Three
additional 500-gallon gasoline USTs were reportedly filled with concrete.The site is
currently in residential use.Figure 1 indicates the location of the site. The site features
are presented on Figure 2.
The closed in-place USTs were removed during February 1997 along with 144 tons of
petroleum-impacted soil. Four of the six confirmation soil samples collected at the
horizontal or vertical extent of the soil excavation, representing two of the former UST
locations, ranged from 2,500 ppm to 13,000 ppm TPH as gasoline range organics.
During March and April 1997, ten soil samples were collected from 12 soil borings
performed to a depth of 24 feet below ground to assess the horizontal extent of impacts
from the release. TPH was not detected in the soil samples.
Groundwater monitoring wells MW-1 through MW-3 were installed on site and were first
sampled during November 1996.
•Multiple VOCs were detected at concentrations greater than the corresponding 2L
Groundwater Quality Standards (2L) in groundwater samples collected in
monitoring well MW-2 during eight sampling events performed from 1996 until
2012.
•Benzene, EDB, 1,2-dichloroethane, and MTBE were detected in groundwater
samples collected from monitoring well MW-1 and MW-3 at concentrations
greater than the corresponding Gross Contaminant Levels (GCL) during sampling
events performed in 2005, 2009, 2010 and 2011.
•Free product was detected in monitoring wells MW-1 and MW-3 during sampling
events performed in 1996, 1998, 2003, 2004, 2008, and during June 2012.
On-site monitoring well MW-4 and off-site monitoring wells MW-5 through MW-11
were installed and were first sampled during April 1998.
•Multiple VOCs were detected at concentrations greater than the corresponding 2L
levels in groundwater samples collected from monitoring well MW-5 during 10
sampling events performed from 1998 until 2012, and in samples collected from
monitoring well MW-8 during eight events from 1998 until 2010. Monitoring
well MW-8 could not be located during the June 2012 sampling event.
•With few exceptions, VOCs were not detected in monitoring wells MW-4 and
MW-6 during the same monitoring events.
•VOCs were not detected in monitoring well MW-7 during 1998 and 2003;
however, benzene was reported at a concentration of 140 microgram per liter
(ug/L) in 2004. Monitoring well MW-7 could not be located during the 2005,
2008 or 2009 sampling events.
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•Benzene was detected in monitoring well MW-9 during 1998 and in monitoring
well MW-10 during 2003, and 1, 2-Dichloroethane was detected in monitoring
well MW-11 in 1998, each at concentrations greater than their 2L levels.
Monitoring wells MW-9 and MW-11 could not be located during monitoring
events performed since 2003. Monitoring well MW-10 has not been located since
2005.
Well RW-1 was installed in the source area and was first sampled in June 2010.
Benzene, EDB, 1,2-dichloroethane and MTBE were detected in groundwater samples
collected from well RW-1 at concentrations greater than the corresponding GCLs during
June 2010, and free product was reported in well RW-1 during June 2012.
The Groundwater Monitoring Report provided by TerraQuest (June 28, 2012)
documented the presence of 12 sole source water supply wells located within 1,000 feet
of the source area, including on-site water supply well WSW-1, and off-site water supply
wells WSW-2 through WSW-11 and WSW-18. S&ME noted references to the prior
installation of a Point-of-Entry (POE) filtration system on water supply well WSW-1 (on
the site), including analytical results for WSW1-PRE POE and WSW1-POST POE from
September 15, 2011 until June 2012.
Additional corrective actions performed in response to the release include approximately
18 Aggressive Fluid/Vapor Extraction (AFVR) events from June 1997 until November
1998, and approximately four Mobile Multi-Phase Extraction (MMPE) events performed
from July 2001 until August 2004.
On February 25, 2015, S&ME collected water samples from monitoring wells MW-1,
MW-2, MW-3, MW-4, MW-5, MW-6, recovery well RW-1, and water supply wells
WSW-1, WSW-2, WSW-3, WSW-4, WSW-5, WSW-6, and WSW-7 for analysis of
VOCs by SM 6200B. Target analytes were detected at concentrations that exceeded the
respective GCL standards in monitoring wells MW-1, MW-3, and recovery well RW-1.
No target constituents were detected above the laboratory reporting limit from the samples
collected from monitor wells MW-2, MW-4, MW-5 and MW-6 and water supply well
samples WSW-1 through WSW-7.
On October 3, 2015, S&ME was on site to gauge depth-to-water and collect groundwater
samples from monitoring wells MW-1, MW-2, MW-4, MW-5, and MW-6. Free product
was measured in monitoring wells MW-1, MW-3, and RW-1 at thicknesses of 0.02 feet,
0.28 feet, and 0.12 feet respectively; therefore, groundwater samples were not collected
from monitoring wells MW-1, MW-3, and MW-4. S&ME collected groundwater
samples from monitoring wells MW-1, MW-2, MW-4, MW-5, and MW-6. The
groundwater samples were analyzed for VOCs by SM 6200B and for natural attenuation
parameters including DO (field tested), REDOX potential, iron by EPA Method 6010,
nitrate by EPA Method 353.2, sulfate by EPA Method 300.0, and alkalinity by SM
2320B.
The groundwater analytical results from the monitoring well MW-1 indicated
concentrations of benzene, EDB, 1,2-dichloroethane, and MTBE greater than the
Groundwater Monitoring Report, Williams Grocery. #15063 S&ME Project No. 4305-14-239B
2425 US Highway 21, Hamptonville, North Carolina September 9, 2016
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corresponding GCLs. Target analytes including but not limited to, ethylbenzene, toluene,
1,2,4-trimethylbenzene, 1,3,5-trimethlybenzene, and total xylenes were detected in
monitoring wells MW-1 and/or MW-3 at concentrations greater than the corresponding
2L Standards, but less than the GCLs. 1,2-Dichloroethane was detected in the
groundwater sample collected monitoring well MW-5 at a concentration that exceeded
2L standard but not the GCL for 1,2-dichloroethane. No target VOCs were identified
above the method detection limits in groundwater samples collected from monitoring
wells MW-4 and MW-6. After evaluating the attenuation indicator parameters, the
information was inconclusive and S&ME is unable to verify or disprove that natural
attenuation is taking place beneath the surface.
On October 3, 2015, S&ME collected samples from water supply wells WSW-4, WSW-
5, and WSW-6. On October 19, 2015 S&ME returned to sample water supply wells
WSW-2 and WSW-7. The water samples were submitted to Pace for laboratory analysis
of VOCs by SM 6200B. No target analytes were detected in the water samples at
concentrations that exceeded the respective laboratory reporting limits.
4.1 UST Owner and Operator Information.
Two (2) of the five (5) USTs associated with the release at the site were removed in
February 1994. The remaining 3 were filled with concrete and later removed in February
1997. The former owner/operator of these tanks was J. Gwyn Gambill, Inc. The address
for J. Gwyn Gambill, Inc. according to the NCDEQ Registered UST Database is PO Box
360, West Jefferson, NC 28694. Information regarding the former UST system at the site
is summarized in Table 1.
4.2 UST Information
The former UST system at the site included one 2,000-gallon gasoline UST, three 500-
gallon gasoline USTs, and one 500-gallon kerosene UST. The USTs were permanently
closed by removal in February 1994 and February 1997. Information regarding these
USTs is summarized in Table 1.
4.3 Description of the UST Release
•Date discovered: February 1994
•Cause and Source: (1) 2,000-gallon gasoline UST; (1) 500 – gallon kerosene
UST.
4.4 Site Characteristics
•Land Use of Site: The site is currently contains vacant residential structures.
Historically the site was a gas station/grocery store (Williams Grocery).
•Land Use of Surrounding Area: The land use of the surrounding area includes a
mixture of residential and agricultural properties.
•Topography: The site is approximately 1,020 feet above the Nation Geodetic
Vertical Datum of 1929. Based upon the topographic map reviewed, the area of
Groundwater Monitoring Report, Williams Grocery. #15063 S&ME Project No. 4305-14-239B
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the subject property slopes predominantly to the east. Refer to Figure 1 for a
USGS Topographic Map.
•Vegetation/Surface Cover: The property consists mainly of vacant land with
scattered grassy areas and a few patches of deciduous trees. A few gravel
driveways also exist to access the existing structures.
•Surface Water: No surface water is present within 1500 feet of the property
according the Yadkin County GIS website.
•Wells: Water supply well WSW-1 exists on the site property, approximately 120
feet south of the source area. Eighteen water supply wells used for drinking water
are located within 1,500 feet of the source area.
•Buildings: The site contains 3 separate structures.
•Soil Type: Soils underlying the site are characterized as Clifford sandy clay loam
(two to six percent slopes) which are well drained and have a low frequency of
flooding.
•Depth to and Nature of Bedrock: According to the 1985 USGS Geologic Map of
North Carolina, the site is underlain by the Inner Piedmont Belt. Bedrock in this
area consists of metamorphosed Granite rock characterized as equigranular to
megacrystic, foliated to massive, which also includes Toluca Granite.
4.5 Owners and Occupants of Adjoining/Nearby Properties and Land
Use
Details regarding the adjacent properties are summarized in Table 2.The land use of the
surrounding area is a mixture of residential and agricultural properties.
4.6 Receptors/Potential Receptor Information
Details regarding the water supply wells near the source area are provided in Table 3 and
the locations of the select identified water supply wells are shown on Figure 3. Water
supply well WSW-4 is the nearest downgradient active water supply well and is located
approximately 820 feet from the source. The nearest active water supply well is well
WSW-1 (on-site) and is located 110 feet upgradient of the source area.
Municipal water is not available to properties within the site vicinity. On February 12,
2016, Mr. David Loftis, P.E. spoke by telephone with Mr. Perry L. Williams (336-679-
2990), Public Works Director with the Town of Yadkinville, North Carolina. According
to Mr. Williams, the nearest water line is located at the intersection of US Highway 21
and Old U.S. Highway 421, approximately 1.75 miles north of the subject property. The
water line is owned by Yadkin County and the water is supplied by the Town of
Jonesville.
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On September 8, 2016, Mr. Bradley Keyse with S&ME spoke to Mr. Derek Shore, the
owner of property addressed 2424 US Highway 21 and adjacent to the subject property.
Mr. Shore currently resides on the property and the house is provided water by the water
supply well (WSW-4) located approximately 500 feet northeast of the residence.
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5.CURRENT SITE ASSESSMENT INFORMATION
5.1 Air Sparge Well Installation
On May 31, 2016, Mr. Darren Cox with S&ME was present to observe the installation of
one (1) permanent air sparge well identified as AS-1. S&ME was present on-site with
driller, Mr. Stefan Smith, a North Carolina licensed well driller with South Atlantic
Environmental Drilling and Construction Company, Inc. (SAEDACCO). A truck-
mounted drill rig was used with 4 ¼-inch augers to complete the soil borings for the
installation of the air sparge well. The approximate location of the air sparge well is
depicted on Figure 2.
The permanent air sparge well consisted of 2-inch diameter schedule 40, flush-thread,
PVC pipe inserted into an approximate 8.5-inch diameter bore hole. The lower portion of
the pipe consists of a 5-foot long manufactured well screen with 0.010-inch slots,
installed to a depth of 45 feet bgs. Medium-to-fine grained, washed sand was placed in
the annular space of the well to a level approximately 2 feet above the top of the well
screen, with an approximate 2-foot thick bentonite seal positioned on top of the sand
pack. The annular space above the bentonite seal was grouted with portland cement to
the ground surface. The drill cuttings were placed on the ground surface near the well.
The new well was encased with a flush mount protective steel casing with a bolted
manhole cover. The well construction log and construction record for air sparge well
AS-1 is presented in Appendix I.
5.2 Free Product Investigation/Recovery
The MMPE event was conducted from June 20, 2016 to June 24, 2016. The free product
check was conducted on July 21, 2016.
5.2.1 Free Product Investigation
A MMPE/air sparge event was performed on monitoring wells MW-1, MW-3 and RW-1
in an effort to recover free product and dissolved VOCs. Prior to conducting the MMPE
Event, free product was not detected in monitor wells MW-1 and MW-3; however, free
product was measured in monitoring well RW-1 at a thickness of 0.01 feet.
5.2.2 MMPE Event
Advanced Environmental Services, Inc., (Advanced) conducted a 96-hour MMPE event
using monitor wells MW-1, MW-3 and RW-1. A copy of the Mobile Multi-Phase
Extraction Report provided by Advanced is included in Appendix II. A total of 4,689
gallons of product/water mix was recovered. This quantity corresponds to an
approximate flow rate of 0.814 gallons per minute per well. Advanced reported that
approximately 15 gallons of measurable free product was recovered as liquid.
Vacuum levels ranged from approximately 11 to 20 inches of Mercury. Air emissions
from the MMPE event were measured using a photoionization detector (PID). Based on
the recorded vapor emissions, 1,445.88 pounds of vapor phase hydrocarbons were
removed, which corresponds to 235.03 gallons of VOC’s (as gasoline). Thus, an
equivalent of 250.03 gallons of product was recovered as liquid and vapor.
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Following the MMPE event, free product was not detected in monitoring wells MW-1,
MW-3, and RW-1 on June 24, 2016.
Based on the subcontractor cost of the MMPE, including monitoring and reporting
(approximately $7,900), and the 250.03 gallons of measurable liquid product and
vaporous hydrocarbons removed, the approximate cost of hydrocarbons removed was
approximately $32 per gallon.
5.3 Air Sparge Summary
The June 20, 2016 to June 24, 2016, MMPE event started with MMPE only at monitor
wells MW-1, MW-3 and RW-1. The MMPE Field Log included in the Mobile Multi-
Phase Extraction Report provided in Appendix II summarizes the VOCs of vapors
measured at the exhaust stack measured concentrations up to 100,000 parts per million
(ppm).
Positive pressure was applied to air sparge well AS-1 beginning at 14:25pm on June 20,
2016. Air flow was set at 5 cfm at a pressure of 18 to 20 psi. The air flow was increased
to 6 cfm on June 20, 2016 and increased to 8 cfm on June 22, 2016. Air flow through
AS-1 continued at approximately 8 cfm until the well was disconnected from the air
compressor on June 24, 2016.
Average VOC measurements collected from the MMPE exhaust stack on June 22, 2016
were 97,000 ppm. Average VOC measurements collected from the MMPE exhaust stack
on June 23, 2016 were 91,000 ppm. Average VOC measurements collected from the
MMPE exhaust stack on the morning of June 24, 2016 were 81,000 ppm.
VOC measurements collected during the MMPE event indicated high VOC readings in
the exhaust stack when MMPE was initiated (100,000 ppm). On the third, fourth, and
fifth days of the event, VOC concentrations in the exhaust stack decreased. This decrease
is not unusual, as VOCs are removed from the subsurface near the vacuum points at the
beginning of the event.
Based on a review of the two previous MMPE events conducted in November 2003 and
August 2004, the total volume of recovered hydrocarbons during the events were less
than the June 2016 MMPE; even though the initial free product measurements were
greater – suggesting that there was more free product available for recovery. Based on
the estimated cost (using trust fund rates) of the 2003 and 2004 MMPE events, the June
2016 MMPE event was approximately three times as cost effective when comparing cost
per gallon of hydrocarbons removed. The table below summarizes the cost comparison
of the previous MMPE events.
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MMPE
Date
Initial Thickness
(feet)
Average
Vapor
Emissions
(ppm)
Recovered
Hydro-
carbons as
Free
Product
(Gallons)
Recovered
Hydro-
carbons as
Vapors
(Gallons)
Approximate
Total
Hydrocarbons
Recovered
(Gallons)
Estimated
Total
Cost
Estimated
Cost Per
Gallon
MW-
1
MW-
3
RW-
1
Jul-01 >4 >4 >4 13,000 700 103 803 $8,0001 $10
Jan-02 3.74 3.78 3.34 >5000 8392 8 847 $8,4001 $10
Nov-
03 0.37 0.00 0.26 Unknown 75 16 91 $9,0001 $91
Aug-
04 0.20 0.05 0.24 3,320 10 67 77 $8,4001 $109
Jun-16 0.00 0.00 0.01 86,000 15 235 250 $7,900 $32
1Estimated using the reasonable rate document.
2The volume of recovered hydrocarbons as free product is unknown for the 2002 MMPE Event. Therefore,
the total gallons of free product was estimated by multiplying the total fluids recovered in the 2002 event
by the ratio of free product recovered to the total gallons of free product and water recovered during the
2001 MMPE event.
As is suggested by the data provided above, in instances where the free product
thicknesses are relatively low, air sparging significantly increases the volume of
hydrocarbons that are recovered; thus, reducing the overall cost per gallon for recovery.
5.4 Current Liquid Levels
On July 21, 2016, 27 days after the MMPE/air sparging event, S&ME was on site to
gauge depth-to-water and collect groundwater samples from monitoring wells MW-1,
MW-3, and RW-1.
Free product was detected in monitoring wells MW-1 at a thickness of 0.23 feet. Free
product was not measured in monitoring well MW-3 and recovery well RW-1. No
sample was taken from monitoring well MW-1 due to free product exceeding a thickness
of 0.01 ft.
5.5 Groundwater Monitoring Events
After measuring the depth-to-water, S&ME personnel purged approximately three well
volumes from monitoring well MW-3 and recovery well RW-1 with a disposable
polyethylene bailer. After completing the well purging, S&ME personnel collected
groundwater samples. The groundwater samples were placed in laboratory-supplied
containers, stored in a cooler with ice, and shipped under chain-of-custody procedures to
Con-Test Analytical Laboratory (Con-Test) for laboratory analysis. The groundwater
samples were analyzed for VOCs by SM 6200B. Field sampling data records are
included in Appendix III.
Groundwater Monitoring Report, Williams Grocery. #15063 S&ME Project No. 4305-14-239B
2425 US Highway 21, Hamptonville, North Carolina September 9, 2016
14
5.6 Summary of Groundwater and Free Product Assessment Information
Prior to the MMPE event, on June 20, 2016, free product was not detected in monitoring
wells MW-1 and MW-3; however, free product was measured recovery well RW-1 at a
thickness of 0.01 feet. Following the MMPE event, free product was measured in
monitoring wells MW-1 at thicknesses of 0.23 feet on July 21, 2016.
The groundwater analytical results from the monitoring well MW-3 and recovery well
RW-1 indicated concentrations of benzene, EDB, and/or 1,2-dichloroethane, greater than
the corresponding GCLs. Target analytes including but not limited to MTBE,
naphthalene, toluene, 1,2,4-trimethylbenzene, 1,3,5-trimethlybenzene, and total xylenes
were detected in monitoring well MW-3 and/or recover well RW-1 at concentrations
greater than the corresponding 2L Standards, but less than the GCLs.
Overall, the groundwater data suggests an obvious reduction in contaminant
concentrations in the monitoring well MW-3 and recovery well RW-1 following the
MMPE and air sparging event. Conversely, free product was measured in monitoring
well MW-1 following the MMPE and air sparging event– suggesting a greater level of
contamination than was detected prior to the MMPE and air sparging event (no free
product).
The monitoring well analytical results compared to the current NCDEQ regulatory
standards are included on Table 5A through Table 5C. Groundwater contamination is
illustrated on the Groundwater QualityMap included in this report as Figure 4.
A copy of the laboratory report is included in Appendix IV.
5.7 Regional and Site Geology and Hydrogeology
5.7.1 Soil and Bedrock
Soils underlying the site are characterized as Clifford sandy clay loam (two to six percent
slopes) well drained and low frequency of flooding. According to the 1985 USGS
Geologic Map of North Carolina, the site is underlain by the Inner Piedmont Belt.
Bedrock in this area consists of metamorphosed Granite rock characterized as
equigranular to megacrystic, foliated to massive, which also includes Toluca Granite.
5.7.2 Hydrogeology
Based upon measurements collected on October 3, 2015 by S&ME, groundwater at the
site appears to flow generally to the east with an average approximate gradient of 0.005
feet per foot.
5.8 Evaluation of Soil, Groundwater, and Free Product Assessment
Information
5.8.1 Current Extent and Severity of Contamination
Free product is present in the vicinity of wells MW-1 with dissolved groundwater
concentrations of benzene, 1,2-dichloroethane, EDB, and MTBE measured in October
2015 greater than corresponding GCLs. Benzene and EDB was measured in wells MW-
3, and RW-1 at concentrations greater than the corresponding GCLs. The analytical data
Groundwater Monitoring Report, Williams Grocery. #15063 S&ME Project No. 4305-14-239B
2425 US Highway 21, Hamptonville, North Carolina September 9, 2016
15
suggests that the downgradient portion of the plume does not extend beyond monitoring
wells MW-5 and MW-6.
5.8.2 Cleanup Levels Achieved
•Soil (soil-to-groundwater maximum soil contaminant concentrations)No
•Groundwater (2L standard concentrations)No
•Free Product (0.01 feet)No
Groundwater Monitoring Report, Williams Grocery. #15063 S&ME Project No. 4305-14-239B
2425 US Highway 21, Hamptonville, North Carolina September 9, 2016
16
6.CONCLUSIONS AND RECOMMENDATIONS
Based on the current and historical assessment information for the site, the following
conclusions are presented:
1.The UST Incident meets the following conditions for a High Risk classification:
a.There are 12 active drinking water supply wells within 1000 feet of the
source area, and an additional six active drinking water supply wells
located between 1,000 and 1,500 feet of the source area.
b.Five (5) active water supply wells are located within 500 feet of the source
area. No target compounds were detected in the samples collected from
water supply wells WSW-2, WSW-4, WSW-5, WSW-6, and WSW-7.
The nearest downgradient active water supply wells is identified as WSW-
4 and is located 820 feet from the source area.
c.Contaminant concentrations for select VOCs exceed the 2L Standards and
GCLs based on analysis of groundwater samples collected from
monitoring well MW-3 and recovery well RW-1 on July 21, 2016.
2.No Surface water bodies were located within 1,500 feet of the source area
3.Water supply wells are the only source of water in the area. Municipal water is
not currently available to the properties in the site vicinity.
4.Free Product was encountered in monitoring well MW-1 at a thickness of 0.23
feet – 27 days after completion of the MMPE event.
5.Approximately 250 gallons of hydrocarbons were recovered during the June 2016
MMPE/air sparge event. To date, an estimated 2,070 gallons of hydrocarbons
were removed from the subject property via MMPE events.
6.When comparing MMPE events conducted with less than three feet of free
product in the recovery points identified as monitoring wells MW-1, MW-3, and
RW-1 (2003 and 2004 events), the June 2016 MMPE/air sparge event was
approximately three times as cost effective. It should be noted that cost of the
2003 and 2004 MMPE events were approximated using the NCDEQ reasonable
rate document. With free product thickness greater than three feet in the recovery
points identified as monitoring wells MW-1, MW-3, and RW-1, a MMPE event
alone may be the most cost effective option. However, the utilization of air
sparging equipment and techniques increases the overall cost by less than 10
percent. Therefore, the use of air sparging events should still be considered
during MMPE events, to further increase the volume of recovered hydrocarbons,
regardless of the free product thicknesses measured in the recovery points.
Groundwater Monitoring Report, Williams Grocery. #15063 S&ME Project No. 4305-14-239B
2425 US Highway 21, Hamptonville, North Carolina September 9, 2016
17
Based on the above, the following recommendations are presented:
1.Sample monitoring wells on a semi-annual basis and to document the migration of
the contaminant plume.
2.Sample the active water supply wells within 500 feet of the source area on a semi-
annual basis.
3.Consider collecting natural attenuation data during the next scheduled
groundwater sampling event to further evaluate for evidence of natural
attenuation.
4.Consider “hot spot” remediation to reduce the dissolved constituent
concentrations and free product in the vicinity of MW-1, MW-3, and RW-1.
Based on our experience and the apparent effectiveness of air sparging in
generating elevated VOCs in the subsurface, S&ME recommends that a
temporary air sparging system be operated at the subject site for at least 6 months
or more to further the reduction of groundwater contamination in the “hot spot”
area.
As documented in S&ME’s New Technology Cleanup Plan report dated August
28, 2015, S&ME evaluated the costs associated with the implementation and
operation of air sparging equipment under two conditions – NCDEQ purchases or
NCDEQ leases the equipment to conduct “hot spot” remediation. S&ME
reviewed these projected costs again – this time removing costs associated with
the installation of one of the three air sparge wells.
If the air sparging equipment is purchased by NCDEQ, S&ME estimated an
implementation cost of $46,000 to $51,000 and operational costs for the first year
of approximately $17,200 annually or $1,433 monthly [total Year 1 estimated cost
$63,000 to $68,200]. If NCDEQ elects to lease the equipment, the
implementation cost would be reduced to approximately $26,000; however, the
operational costs (including the equipment lease costs) would be approximately
$35,000 to $39,000 annually or $2,900 to $3,250 monthly [total Year 1 estimated
cost $63,000 to $67,000].
FIGURES
0GRAPHIC SCALE600300600SCALE: 1" = 600'PROJECT NO.DATE:FIGURE NO.SCALE:WWW.SMEINC.COM3718 OLD BATTLEGROUND ROADGREENSBORO, NC 27410PH. 336-288-7180FAX. [phone]DRAWN BY:CHECKED BY:DRAWING PATH:Q:\4305\2014\14-239 - WILLIAMS GROCERY\A\11-15\Williams Grocery Site.dwgTOPOGRAPHIC MAPWILLIAMS GROCERY2425 U.S. HIGHWAY 214305-14-239A1OCT.2015AS SHOWNRDMALBHAMPTONVILLE, YADKIN COUNTY, NORTH CAROLINAINCIDENT No. 150631,500 'SITE/2&$7,21ƒ
1ƒ
:(Google Earth)SOURCE: BROOKS CROSSROADS, NC USGS TOPOGRAPHIC MAP, 7.5-MINUTE SERIES, DATED 2013 (www.usgs.gov)SCALE: 1" = 600'
MW2MW1MW4MW3MW5H
A
M
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T
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0GRAPHIC SCALE10050100SCALE: 1" = 100'PROJECT NO.DATE:FIGURE NO.SCALE:WWW.SMEINC.COM3718 OLD BATTLEGROUND ROADGREENSBORO, NC 27410PH. 336-288-7180FAX. [phone]DRAWN BY:CHECKED BY:DRAWING PATH:Q:\4305\2014\14-239 - WILLIAMS GROCERY\A\11-15\Williams Grocery Site.dwgSITE PLANWILLIAMS GROCERY2425 U.S. HIGHWAY 214305-14-239A2OCT.2015AS SHOWNRDMALBHAMPTONVILLE, YADKIN COUNTY, NORTH CAROLINAINCIDENT No. 15063Reference: "SITE LAYOUT MAP, FORMER WILLIAMS GROCERY", by Terraquest Environmental Consultants,Figure 3, dated 6/28/12, and 2010 aerial photograph obtained from www.nconemap.comFORMERWILLIAMSGROCERYLEGEND- MONITORING WELL LOCATION- WATER SUPPLY WELL LOCATION- SPARGE WELL LOCATION- FORMER UST LOCATIONNOTE: LOCATIONS SHOWN ARE APPROXIMATEPETTY ROADU.S. HIGHWAY 21HOUSEMW6WSW1WSW5(WALL)WSW3(CHURCH)RW1HOUSEHOUSEAPTFORMERSHELLSTATION &MOBILE HOMEAPTPROPERT
Y
BOUNDARYMW8(NOT FOUND)MW11(NOT FOUND)AS-1
0GRAPHIC SCALE500250500SCALE: 1" = 500'PROJECT NO.DATE:FIGURE NO.SCALE:WWW.SMEINC.COM3718 OLD BATTLEGROUND ROADGREENSBORO, NC 27410PH. 336-288-7180FAX. [phone]DRAWN BY:CHECKED BY:DRAWING PATH:Q:\4305\2014\14-166 - WILLIAMS GROCERY\Williams Grocery Site.dwgWATER SUPPLY WELLLOCATION MAPWILLIAMS GROCERY2425 U.S. HIGHWAY 214305-14-1663JUNE 2015AS SHOWNRDMDRLHAMPTONVILLE, YADKIN COUNTY, NORTH CAROLINAINCIDENT No. 150631,
0
0
0

'
50
0

'US Hwy 21Hamptonville RdLEGEND- WATER SUPPLY WELL1,500 'Pet
ty
RdWSW1WSW3(Church)WSW5(Wall)WSW6(Gardner)WSW8WSW17WSW18WSW2(Gail)WSW4(Shore)WSW7(Windsor)WSW9WSW10WSW11WSW16WSW15WSW12WSW14WSW13Reference: "SITE VICINITY MAP, FORMER WILLIAMS GROCERY", by Terraquest Environmental Consultants,Figure 2, dated 1/20/10 and 2010 aerial photograph obtained from www.nconemap.com. Parcel data obtained from Yadkin County GIS website
MW2MW1MW4MW3MW5H
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0GRAPHIC SCALE10050100SCALE: 1" = 100'PROJECT NO.DATE:FIGURE NO.SCALE:WWW.SMEINC.COM3718 OLD BATTLEGROUND ROADGREENSBORO, NC 27410PH. 336-288-7180FAX. [phone]DRAWN BY:CHECKED BY:DRAWING PATH:Q:\4305\2014\14-239 - WILLIAMS GROCERY\B\9-16\Williams Grocery Site.dwgGROUNDWATER QUALITY MAPWILLIAMS GROCERY2425 U.S. HIGHWAY 214305-14-239B4SEPT. 2016AS SHOWNRDMALBHAMPTONVILLE, YADKIN COUNTY, NORTH CAROLINAINCIDENT No. 15063Reference: "SITE LAYOUT MAP, FORMER WILLIAMS GROCERY", by Terraquest Environmental Consultants,Figure 3, dated 6/28/12, and 2010 aerial photograph obtained from www.nconemap.comFORMERWILLIAMSGROCERYLEGEND- MONITORING WELL LOCATION- WATER SUPPLY WELL LOCATION- SPARGE WELL LOCATION- FORMER UST LOCATIONNOTES·LOCATIONS SHOWN ARE APPROXIMATE.·ONLY TARGET ANALYTES DETECTED AT CONCENTRATIONS THATEXCEED THE RESPECTIVE 2L STANDARDS ARE PRESENTED IN THISFIGURE.PETTY ROADU.S. HIGHWAY 21HOUSEMW6WSW1WSW5(WALL)WSW3(CHURCH)RW1HOUSEHOUSEAPTFORMERSHELLSTATION &MOBILE HOMEAPTPROPERT
Y
BOUNDARYMW8(NOT FOUND)MW11(NOT FOUND)AS-1MW3ug/LBenzene5400JToluene31000Ethylbenzene3500Total xylenes19400Methyl tert-butyl ether (MTBE)300Diisopropyl ether95Jn-Butylbenzene320sec-Butylbenzene70J1,2-Dibromoethane8501,2-Dichloroethane3002-Hexanone (MBK)1800JIsopropylbenzene260n-Propylbenzene630Naphthalene22001,2,4-Trimethylbenzene50001,3,5,-Trimethylbenzene1400RW1ug/LBenzene17000Toluene29000Ethylbenzene3200Total xylenes16000Methyl tert-butyl ether (MTBE)2100Diisopropyl ether300n-Butylbenzene1401,2-Dibromoethane7801,2-Dichloroethane6702-Hexanone (MBK)880JIsopropylbenzene160Jn-Propylbenzene420JNaphthalene21001,2,4-Trimethylbenzene37001,3,5,-Trimethylbenzene920MW1Not Sampled (Free Product)MW2Not SampledMW4Not SampledMW5Not SampledMW6Not Sampled
TABLES
Table 1
UST System Information
2425 US Highway 21
Hamptonville, North Carolina
NCDEQ Incident No. 15063
SE Project No. 4305-14-239B
Tank ID Tank Closure
Date*
Capacity
(Gallons)Last Contents
T1 2/1/19941 2,000 Gasoline
T2 2/1/19941 500 Kerosene
T3 2/1/19942 500 Gasoline
T4 2/1/19942 500 Gasoline
T5 2/1/19942 500 Gasoline
Notes:
Unknown
Unknown
Information was obtained from Report of Well Installation and Groundwater Sampling
written by Engineering Consulting Services, Ltd. (ESC) and dated October 10, 1997.
1 Tanks were removed from the site.
2 Tanks were filled in place with concrete in February 1994 and later removed in February 1997.
Tank Installation
Date
Unknown
Unknown
Unknown
Table 2
Adjacent Property Owner Information
2425 US Highway 21
Hamptonville, North Carolina
NCDEQ Incident No. 15063
SE Project No. 4305-14-239B
Map ID Description Location Usage Contanct
(Telephone)
Distance from
Source Area of
Release (feet)
Site Residential
2425 US Highway 21
Hamptonville, NC
27020
Residential Ashley Enterprises
(Unknown)0
WSW-3 Residential
1704 Hamptonville Rd.
Hamptonville, NC
27020
Residential Delma Church
(Unknown)345
WSW-4 Residential
2424 US Highway 21
Hamptonville, NC
27020
Residential Derek A. Shores
(Unknown)820
WSW-5 Residential
1708, 1712
Hamptonville Rd.
Hamptonville, NC
27029
Residential Wesley Wall
(Unknown)400
WSW-6 Residential
1717 Hamptonville Rd.
Hamptonville, NC
27020
Residential John Gardner
(Unknown)300
WSW-7 Residential
2405 US Highway 21
Hamptonville, NC
27020
Residential Georgia Windsor
(Unknown)450488500081575
4875988942
4885081800
4875999073
Parcel Number
487500997117
488500093375
487500984615
487500985765
Table 3
Water Supply Well Information
2425 US Highway 21
Hamptonville, North Carolina
NCDEQ Incident No. 15063
SE Project No. 4305-14-239B
Well ID
No Well Owner/Address Well Address Well Use Well Depth
(feet BGS)
Type of
Well
Casing
Depth
(feet BGS)
Screen
Interval
(feet BGS)
Distance from
Source
Area of Release
(feet)
WSW-1
on site
Ashley Enterprises
2117 US HWY 21 S.
Hamptonville, NC 27020
2425 US Highway 21
Hamptonville, NC
27020
sole source unknown unknown unknown unknown 105
WSW-2
Gail
Sandra Gail
2508 US HWY 21
Hamptonville, NC 27020
2032 Petty Rd.
Hamptonville, NC
77020
sole source unknown Drilled unknown unknown 640
WSW-3
Church
Delma Church (deceased)
1704 Hamptonville Rd.
Hamptonville, NC 27020
1704 Hamptonville Rd.
Hamptonville, NC
27020
sole source unknown unknown unknown unknown 345
WSW-4
Shore
Derek A Shore
2424 US HWY 21
Hamptonville, NC 27020
2424 US Highway 21
Hamptonville, NC
27020
sole source unknown unknown unknown unknown 820
WSW-5
Wall
Wesley Wall
PO Box 206
Sullivan Island, SC 29482
1708, 1712
Hamptonville Rd.
Hamptonville, NC
27029
sole source unknown unknown unknown unknown 400
WSW-6
Gardner
John H. Gardner (deceased)
1717 Hamptonville Rd.
Hamptonville NC 27020
1717 Hamptonville Rd.
Hamptonville, NC
27020
sole source unknown unknown unknown unknown 300
WSW-7
Windsor
Terry Windsor
4139 Old US HWY 21
Hamptonville NC 27020
2405 US Highway 21
Hamptonville, NC
27020
sole source unknown unknown unknown unknown 450
WSW-8
Jerry Wall
PO Box 509
Hamptonville, NC 27020
1737 Hamptonville Rd.
Hamptonville, NC
27020
sole source unknown unknown unknown unknown 925
WSW-9
Willis Scowls
2401 US HWY 21
Hamptonville NC 27020
2401 US Highway 21
Hamptonville, NC
27020
sole source unknown unknown unknown unknown 655
WSW-10
Olen King
2345 US HWY 21
Hamptonville, NC 27020
2345 US Highway 21
Hamptonville, NC
27020
sole source unknown unknown unknown unknown 695
WSW-11
Charles Moorefield
2337 US HWY 21
Hamptonville, NC 27020
2337 US Highway 21
Hamptonville, NC
27020
sole source unknown unknown unknown unknown 945
WSW-12
Minnie Chappell
1308 Ruck Sholes Rd.
Hamptonville, NC 27020
1515 Dooley Rd.
Hamptonville, NC
27020
sole source unknown unknown unknown unknown 1,040
WSW-13
Undo S. Wall
2352 US HWY 21
Hamptonville, NC 27020
2352 US Highway 21
Hamptonville, NC
27020
sole source unknown unknown unknown unknown 1,465
WSW-14
Minnie Chappell
1308 Buck Sholes Rd.
Hamptonville, NC 27020
1515 Dooley Rd.
Hamptonville, NC
27020
sole source unknown unknown unknown unknown 1,120
WSW-15
Ralph Talley
7328 US HWY 21
Hamptonville, NC 27020
2328 US Highway 21
Hamptonville, NC
27020
sole source unknown unknown unknown unknown 1,320
WSW-16
Walter Durham
2329 US HWY 21
Hamptonville, NC 27020
2325 US Highway 21
Hamptonville, NC
27020
sole source unknown unknown unknown unknown 1,290
WSW-17
Glenn Wall
1744 Hamptonville Rd
Hamptonville, NC 27020
1744 Hamptonville Rd.
Hamptonville NC 27020 sole source unknown unknown unknown unknown 1,045
WSW-18
Bobby D. Church
2516 US HWY 21
Hamptonville, NC 27020
2516 US Highway 21
Hamptonville, NC
27020
sole source unknown unknown unknown unknown 690
Notes:
ft. BGS =feet below ground surface.
Information obtained from Terraquest Water Supply Well Information table (June 2012), telephone and field Interviews (February 2014) and Yadkin County GIS; revised
information shown in itlaics .
Well ID numbers are displayed on Figure 2.
Table 4
Monitoring Well Construction Information
2425 US Highway 21
Hamptonville, North Carolina
NCDEQ Incident No. 15063
SE Project No. 4305-14-239B
Well ID
Top of Casing
Elevation*
(ft.)
Depth to Water
from Top
of Casing (ft.)
October 3, 2015
Groundwater
Elevation
(ft.)
MW-1 23 to 33 498.82 25.21 473.61
MW-2 20 to 30 499.27 25.61 473.66
MW-3 23 to 33 499.47 25.84 473.63
MW-4 24 to 34 499.45 25.90 473.55
MW-5 24 to 34 498.34 25.49 472.85
MW-6 24 to 34 495.39 22.15 473.24
RW-1 499.38 25.72 473.66
Notes:
MW-7, MW-8, MW-9 and MW-10 were reported as "could not locate" in previous monitoring reports.
*Top of Casing Elevations provided from previous consultant reports.
ft. BGS - feet below ground surface
Screen
Interval
(ft. BGS)
unknown
Table 5A
Historical and Current Groundwater Analytical Results
2425 US Highway 21
Hamptonville, North Carolina
NCDEQ Incident No. 15063
SE Project No. 4305-14-239B
11/8/96
4/14/98
6/12/03
3/8/04
12/1/05 23,009 33,000 3,200 152,000 25000 560 --<250 -1,200 -5,100 --<250 --<250 <250 2,700 -3700 15,200
9/10/08
6/17/09
11/30/09 26,000 29,000 3,000 9,100 28,000 590 5,000 <3.2 25 -1,000 <2 <2 9700 190 110 2,700 -300 4,000 800 67 2,500 110
6/14/10 30000 35,000 2,900 16,400 54,000 600 10,000 <2 82 34 1,300 <1.5 2,900 <1,700 580 160 7,400 <1.9 420 -1,100 72 1400 1,100
9/15/11 35000 38,000 2,700 19500 75000 940 14,000 <3.1 <5.9 <5.4 1,800 <3.8 4,300 <4,200 450 190 9,800 250 320 96 660 170 2,100 550
6/13/12
2/25/14 24,800 32,900 2,890 19,280 66,200 744 NA <25.0 <25.0 <25.0 1,440 <25.0 2860 NA NA 144 NA NA 438 NA 1,090 103 3,880 1,110
10/3/151 23,400 30,700 2,550 14,090 35,900 549 NA <250 250 <250 1,350 <250 2,500 NA NA <250 NA NA <250 NA <1,000 <250 2,170 588
7/21/16
11/8/96 1,200 3,100 400 1,580 ND 170 --NS -11.3 -NS --NS --NS NS NS -NS NS
4/14/98 640 1,100 56 350 ND 81 --NS -ND -NS --NS --NS NS ND -NS NS
6/12/03 ND 1.3 ND 12 ND ND --NS -ND -ND --ND --ND NS ND -ND 5
3/8/04 1.4 2.6 ND 27.1 ND ND --NS -ND -ND --ND --ND NS ND -ND 10
12/1/05 ND ND ND ND ND ND --ND -<.5 -<.5 --ND --ND ND ND -ND ND
9/10/08 142 494 92.7 386 <.5 <.5 --<.5 -1.7 -<5 --3.4 --6.3 <.5 15.7 -44.1 24
6/17/09 41 120 16 79 <1 <1 --<1 -<1 -<1 --<1 --1.4 <1 <5 -8.3 4.60
11/30/09 22 39 8 91 <0.11 <0.080 <0.62 <0.080 <0.24 -<0.11 <0.050 <0.070 <42 <0.19 <0.10 <0.90 -0.52 <0.14 1.6 <0.050 4.7 <0.080
6/14/10 <0.054 <0.057 <0.054 <0.174 <0.056 <0.034 <1.5 <0.031 <0.059 <0.054 <0.041 <0.038 <0.054 <42 <0.11 <0.034 <0.83 <0.048 <0.059 -<0.094 <0.034 <0.038 <0.038
9/15/11 10 110 20 214 <0.056 <0.042 <1.5 <0.031 0.57 <0.054 <0.041 <0.038 <0.054 <42 3.9 2.8 <0.83 4 4.4 1.7 16 <0.034 140 38
6/13/12 710 5,200 480 2,900 <0.056 <0.042 49 J <0.031 22 <0.054 <0.041 <0.038 <0.054 <42 3.9 23 <0.83 4 22 12 130 16 580 210
2/24/14 <0.50 <0.50 <0.50 <1.5 <0.50 <0.50 NA <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA <0.50 NA NA <0.50 NA <2.0 <0.50 <0.50 <0.50
10/3/15 51.7 233 2550 188.6 <0.50 549 NA <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA 1.5 NA NA 2.3 NA 8.0 0.75 19.7 12.7
11/8/96
4/14/98
6/12/03
3/8/04
12/1/05 23,000 34,000 2,300 313,500 2,900 570 --ND -1,100 -1,200 --88 --220 ND 760 -2,100 460
9/10/08
6/17/09 11,000 26,000 4,300 22,200 <100 <100 --210 -470 -310 --260 --990 <100 610 -6,300 2,000
11/30/09 9.200 13,000 1,700 9,000 <4.4 <3.2 <25 <3.2 33 ----<1,700 <7.6 90 350 -250 <5.6 570 ---
6/14/10 14,000 23,000 2,100 11,500 410 87 7,500 <1.2 31 <2.2 510 <1.5 410 <1,700 790 110 6,800 340 280 -870 70 2,200 620
9/15/11 31,000 44,000 2,900 15,200 590 300 10,000 <3.1 <5.9 <5.4 1,200 <3 8 1,100 <4,200 1,200 210 6,200 420 370 95 890 210 2,700 670
6/13/12
2/25/14 17,500 37,500 3,570 23,020 598 149 NA <50.0 <50.0 <50.0 1,030 <50.0 607 NA NA 192 NA NA 624 NA 1,340 176 4,980 1,400
10/3/15
7/21/16 5400J 31,000 3,500 19,400 300 95J 5,400 <150 320 70J 850 <79 300 NA 1800J 260 NA <730 630 <75 2,200 <75 5,000 1,400
1 600 600 500 20 70 6,000 0.6 70 70 0.02 6 0.4 NE 40 70 4,000 NE 70 25 6 70 400 400
5,000 260,000 84,500 85,500 20,000 70,000 6,000,000 NE 6,900 8,500 50 6,000 400 NE 280,000 25,000 4,000,000 NE 30,000 NE 6,000 70,000 28,500 25,000
Notes:
Information prior to February 24, 2014 was obtained from Groundwater Monitoing Report written by TERRAquest Environmental Consultants, P.C. report and dated June 28, 2012.
Concentrations are reported in micrograms per liter (ug/L) or parts per billion (ppb).
Only contaminants detected above the method detection limits are shown.
Concentrations shown in BOLD exceed the corresponding North Carolina groundwater quality standard (2L Standard).
Concentrations SHADED exceed the Gross Contamination Levels (GCLs).
< - less than sample detection limit.
ND - None Detected
NE - Not Established.
"-" - Below Reporting Limit
NA - Not Analyzed
1Free product thickness was measured at 0.02 feet
Not Sampled - Free Product
Not Sampled - Free Product
Not Sampled - Free Product
Not Sampled - Free Product
Not Sampled - Free Product
Not Sampled - Free Product
2L Standard
GCL
MW-3 n-ButylbenzeneEthylbenzeneVolatile Organic Compounds (VOCs) by 6200B
1,2,4-TrimethylbenzeneStyreneMethylethylketoneMethylIsobutylketone(MIBK)EthanolIsopropylbenzeneNot Sampled - Free Product
Not Sampled - Free Product
Not Sampled - Free Product
Not Sampled - Free Product
Not Sampled - Free Product
Analytical Method
TotalXylenesMTBEDiisopropyletherAcetoneMW-2 sec-ButylbenzeneNot Sampled - Could Not Locate n-Propylbenzene1,2-DichloroethaneDate Collected
1,2-Dibromoethanep-Isopropyltoluene1,1-DichloroethaneNaphthaleneNot Sampled - Free Product
Well ID
Not Sampled - Free Product (0.23 feet)
MW-1 BromodichloromethaneBenzeneToluene1,3,5,-Trimethylbenzene2-Hexanone(MBK)Not Sampled - Free Product
Table 5B
Historical and Current Groundwater Analytical Results
2425 US Highway 21
Hamptonville, North Carolina
NCDEQ Incident No. 15063
SE Project No. 4305-14-239B
4/14/98 6 2 1 4 ND ND --NS -ND -NS --NS --NS NS NS -NS NS
6/12/03 ND ND ND ND ND ND --NS -ND -ND --ND --ND NS ND -ND ND
3/8/04 ND ND ND ND ND ND --NS -ND -ND --ND --ND NS ND -ND ND
12/1/05 ND ND ND ND ND ND --ND -<.5 -<.5 --ND --ND ND ND -ND ND
9/10/08 <.5 0.58 <.5 <1 <.5 <.5 --<.5 -<.5 -<.5 --<.5 --<.5 <.5 <2 -<.5 <.5
6/17/09 <1 <5 <1 <3 <1 <1 --<1 -<1 -<1 --<1 --<1 <1 <5 -<1 <1
11/30/09 <0.040 <0.060 <0.090 <0.19 <0.11 <0.080 <0.62 <0.080 <0.24 -<0.11 <0.050 <0.070 <42 -<0.10 <0.090 <0.090 <0.14 <0.23 <0.050 <0.14 <0.080
6/14/10 <0.054 <0.057 <0.054 <0.174 <0.056 <0.034 <1.5 <0.031 <0.059 <0.054 <0.041 <0.038 <0.054 <42 <0.11 <0.034 <0.83 <0.048 <0.059 -<0.094 <0.034 <0.038 <0.038
9/15/11 <0.054 <0.057 <0.054 <0.17 <0.056 <0.034 <1.5 <0.031 <0.059 <0.054 <0.041 <0.038 <0.054 <42 <0.11 <0.034 <0.83 <0.048 <0.059 -<0.094 <0.034 <0.038 <0.038
6/13/12 <0.054 <0.057 <0.054 <0.17 <0.056 <0.034 <1.5 <0.031 <0.059 <0.054 <0.041 <0.038 <0.054 <42 <0.11 <0.034 <0.83 <0.048 <0.059 -<0.094 <0.034 <0.038 <0.038
2/24/14 <0.50 <0.50 <0.50 <1.5 <0.50 <0.50 NA <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA <0.50 NA NA <0.50 NA <2.0 <0.50 <0.50 <0.50
10/3/15 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA <0.50 NA NA <0.50 NA <2.0 <0.50 <0.50 <0.50
4/14/98 2,200 1,200 120 820 ND ND --NS -54 -NS --NS --NS NS NS -NS NS
6/12/03 3200 700 190 1,220 ND ND --NS -ND -450 --ND --ND NS ND -170 62
3/8/04 140 5 7.1 68 ND ND --NS -3.8 -47 --ND --ND NS ND -9.4 2.7
12/1/05 200 2.6 5.4 98 3.5 4 --ND -2.1 -52 --0.7 --ND ND 5.1 -16 4.5
9/10/08 520 3.6 3 155.8 8.2 5.1 --< 5 -3.4 -88.4 --1.1 --001 <.5 6.6 -30 9.9
6/17/09 2,900 < 500 110 1,140 <100 < 100 --< 100 -< 100 -320 --< 100 --< 100 <100 <500 -220 <100
11/30/09 3,300 58 150 1,570 60 22 <25 <3.2 <9.6 -<4.4 <2 270 <1,700 <7.6 <4 <36 -<3.6 <5.6 <9.2 <2 290 54
6/14/10 42 <0.057 <0.057 8.2 3.4 0.63 <1.5 <0.031 <0.059 <0.054 <0.041 <0.038 19 <42 <0.11 <0.034 <0.83 <0.048 <0.059 -1.7 <0.034 1.5 0.59
9/15/11 110 <0.057 1 19.3 1.8 0.72 <1.5 <0.031 <0.059 <0.054 <0.041 <0.038 13 <42 <0.11 <0.034 <0.83 <0.043 <0.059 <0.059 2.1 <0.034 5.9 1.60
6/13/12 370 2 7.8 75 7.5 2.2 <1.5 <0.031 1.5 0.85 <0.041 <0.038 31 <42 <0.11 <0.034 <0.83 <0.043 <0.059 <0.059 2.2 <0.034 15 5.9
2/24/14 <0.50 <0.50 <0.50 <1.5 <0.50 <0.50 NA <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA <0.50 NA NA <0.50 NA <2.0 <0.50 <0.50 <0.50
10/3/15 0.56 <0.50 <0.50 <1.0 1.8 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 6.5 NA NA <0.50 NA NA <0.50 NA <2.0 <0.50 <0.50 <0.50
4/14/98 ND ND ND ND ND ND --NS -ND -NS --NS --NS NS NS -NS NS
6/12/03 ND ND ND ND ND ND --NS -ND -ND --ND --ND NS ND -ND ND
3/8/04 1.1 ND ND ND ND ND --NS -ND -ND --ND --ND NS ND -ND ND
12/1/05 ND ND ND ND ND ND --ND -<.5 -<.5 --ND --ND ND ND -ND ND
9/10/08 <.5 <.5 <.5 <1 <.5 <.5 --<.5 -<.5 -<.5 --<.5 --<.5 <.5 <2 -<.5 <.5
6/17/09 <1 <5 <1 <3 <1 <1 --<1 -<1 -<1 --<1 --<1 <1 <5 -<1 <1
11/30/09 <0.040 <0.060 <0.090 <0.19 <0.11 <0.080 <0.62 <0.080 <0.24 -<0.11 <0.050 <0.070 <42 <0.19 <0.10 <0.90 -<0.090 <0.14 <0.23 <0.050 <0.14 <0.080
6/13/12 <0.040 <0.060 <0.090 <0.19 <0.11 <0.080 <0.62 <0.080 <0.24 -<0.11 <0.050 <0.070 <42 <0.19 <0.10 <0.90 -<0.090 <0.14 <0.23 <0.050 <0.14 <0.080
2/24/14 <0.50 <0.50 <0.50 <1.5 <0.50 <0.50 NA <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA NA NA NA <0.50 NA <2.0 <0.50 <0.50
10/3/15 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 NA <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA <0.50 NA NA <0.50 NA <2.0 <0.50 <0.50 <0.50
1 600 600 500 20 70 6,000 0.6 70 70 0.02 6 0.4 NE 40 70 4,000 NE 70 25 6 70 400 400
5,000 260,000 84,500 85,500 20,000 70,000 6,000,000 NE 6,900 8,500 50 6,000 400 NE 280,000 25,000 4,000,000 NE 30,000 NE 6,000 70,000 28,500 25,000
2L Standard
GCL
Notes:
Information prior to February 24, 2014 was obtained from Groundwater Monitoing Report written by TERRAquest Environmental Consultants, P.C. report and dated June 28, 2012.
Concentrations are reported in micrograms per liter (ug/L) or parts per billion (ppb).
Only contaminants detected above the method detection limits are shown.
Concentrations shown in BOLD exceed the corresponding North Carolina groundwater quality standard (2L Standard).
Concentrations SHADED exceed the Gross Contamination Levels (GCLs).
< - less than sample detection limit.
ND - None Detected
NE - Not Established.
"-" - Below Reporting Limit
NA - Not Analyzed
1Free product thickness was measured at 0.02 feet
MW-4
MW-5
MW-6 1,3,5,-TrimethylbenzeneMethylethylketoneMethylIsobutylketone(MIBK)n-Propylbenzenep-IsopropyltolueneNaphthalene1,2-DichloroethaneEthanol2-Hexanone(MBK)IsopropylbenzeneStyrene1,2,4-TrimethylbenzeneAcetoneBromodichloromethanen-Butylbenzenesec-Butylbenzene1,2-Dibromoethane1,1-DichloroethaneAnalytical Method Volatile Organic Compounds (VOCs) by 6200B
Well ID Date
Collected
BenzeneTolueneEthylbenzeneTotalXylenesMTBEDiisopropylether
Table 5C
Historical and Current Groundwater Analytical Results
2425 US Highway 21
Hamptonville, North Carolina
NCDEQ Incident No. 15063
SE Project No. 4305-14-239B
4/14/98 ND ND ND ND ND ND --NS ND -NS --NS ---NS NS -NS NS
6/12/03 ND ND ND ND ND ND --NS -ND -ND --ND --ND ND ND -ND ND
3/8/04 1.40 ND ND 9.6 ND ND --NS -ND -ND --ND --ND ND ND -1.6 ND
12/1/05
9/10/08
6/17/09
4/14/98 240 2 ND 24 ND ND --NS -ND -NS --NS --NS NS NS -NS NS
6/12/03 2,300 ND ND 310 ND ND --NS -ND -ND --ND --ND NS ND -ND ND
3/8/04 1,200 ND ND 160 ND ND --NS -ND -140 --ND --ND NS ND -ND ND
12/1/05 1,600 1.9 ND ND 28 14 --ND -<.5 -140 --6.6 --ND ND 54 -ND 4.8
9/10/08 1,130 1 <.5 76 34 10 --1.8 -<.5 -116 --8 --<.5 3.2 65.3 -<.5 3.2
6/17/09 610 <5 <1 90 22 6.1 --<1 -<1 -66 --3.5 --<1 1.2 7.7 -<1 1.4
11/30/09 890 0.60 <0.90 161.3 30 8.8 <6.2 <0.80 <2.4 -<1.1 <0.50 77 <420 <1.9 <1 <9 -<0.90 <1.4 44 <0.50 <1.4 <0.80
6/14/10 970 <0.57 <0.54 101.1 30 7.6 <15 <0.31 <0.59 <0.54 <0.41 <0.38 80 <420 <1.1 <0.34 <8.3 <0.48 <0.59 -30 <0.34 <0.38 <0.38
6/13/12
4/14/98 5 ND ND 4 ND ND --NS -ND -NS --NS --NS NS NS -NS NS
6/12/03
3/8/04
9/21/05
9/10/08
6/17/09
4/14/98 ND ND ND ND ND ND --NS -ND -NS --NS --NS NS NS -NS NS
6/12/03 3.8 ND ND ND 4.1 ND --NS -ND -ND --ND --ND NS ND -ND ND
3/8/04 ND ND ND ND ND ND --ND -ND -ND --ND --ND ND ND -ND ND
12/1/05 ND ND ND ND ND ND --ND -<.5 -<.5 --ND --ND ND ND -ND ND
9/10/08
6/17/09
4/14/98 ND ND ND ND ND ND --NS -0.07 -NS --NS --NS NS NS -NS NS
6/12/03
3/8/04
9/21/05
9/10/08
6/17/09
6/14/10 31,000 46,000 3,500 16,800 23,000 560 2,400 <1.2 110 42 860 <1.5 1,800 <1,700 -200 2,900 <1.9 560 -1,300 150 4,000 1,200
6/13/12
2/25/14 30,200 47,100 3,350 12,900 7,980 590 NA <50.0 <50.0 <50.0 998 <50.0 1,620 NA NA 118 NA NA 343 NA 1,040 202 2,900 653
10/3/15
7/21/16 17,000 29,000 3,200 16,600 2,100 300 <2,400 <150 140 <65 780 <79 670 NA 880J 160J NA 880 420J NA 2,100 <75 3,700 920
1 600 600 500 20 70 6,000 0.6 70 70 0.02 6 0.4 NE 40 70 4,000 NE 70 25 6 70 400 400
5,000 260,000 84,500 85,500 20,000 70,000 6,000,000 NE 6,900 8,500 50 6,000 400 NE 280,000 25,000 4,000,000 NE 30,000 NE 6,000 70,000 28,500 25,000
RW-1
Not Sampled - Free Product
2L Standard
GCL
Notes:
Information prior to February 24, 2014 was obtained from Groundwater Monitoing Report written by TERRAquest Environmental Consultants, P.C. report and dated June 28, 2012.
Concentrations are reported in micrograms per liter (ug/L) or parts per billion (ppb).
Only contaminants detected above the method detection limits are shown.
Concentrations shown in BOLD exceed the corresponding North Carolina groundwater quality standard (2L Standard).
Concentrations SHADED exceed the Gross Contamination Levels (GCLs).
< - less than sample detection limit.
ND - None Detected
NE - Not Established.
"-" - Below Reporting Limit
NA - Not Analyzed
1Free product thickness was measured at 0.02 feet
Not Sampled - Free Product
MW-10
Not Sampled - Could Not Locate
Not Sampled - Could Not Locate
MW-11
Not Sampled - Could Not Locate
Not Sampled - Could Not Locate
Not Sampled - Could Not Locate
Not Sampled - Could Not Locate
Not Sampled - Could Not Locate MethylIsobutylketone(MIBK)NaphthaleneMW-8
Not Sampled - Could Not Locate
MW-9
Not Sampled - Could Not Locate
Not Sampled - Could Not Locate
Not Sampled - Could Not Locate
Not Sampled - Could Not Locate
Not Sampled - Could Not Locate 2-Hexanone(MBK)IsopropylbenzeneMW-7 Not Sampled - Could Not Locate
Not Sampled - Could Not Locate
Not Sampled - Could Not Locate Styrene1,2,4-Trimethylbenzene1,3,5,-TrimethylbenzeneMethylethylketoneAcetoneBromodichloromethanen-Butylbenzenesec-Butylbenzenen-Propylbenzenep-Isopropyltoluene1,2-Dibromoethane1,1-Dichloroethane1,2-DichloroethaneEthanolAnalytical Method Volatile Organic Compounds (VOCs) by 6200B
Well ID Date
Collected
BenzeneTolueneEthylbenzeneTotalXylenesMTBEDiisopropylether
Table 6
Summary of Water Supply Well Analytical Results
2425 US Highway 21
Hamptonville, North Carolina
NCDEQ Incident No. 15063
SE Project No. 4305-14-239B
Well ID Date
BenzeneTolueneXylenes(Total)Methyltert-butyletherNaphthaleneDiisopropyletherChloromethane1,2-DichloroethaneIsopropylbenzene1,2,4-Trimethylbenzene1,3.5-Trimethylbenzene6/14/2010 63 0.95 13.84J 28 2.6 0.69 0.97 1.3 <0.034 <0.038 0.80
9/13/2010 55 0.79 16 24 3.4 0.63 <0.032 1 0.67 1.2 1.1
2/25/2014 <0.50 <0.50 <1.0 <0.50 <2.0 <0.50 <1.0 <0.50 <0.50 <0.50 <0.50
2/25/2014 <0.50 <0.50 <1.0 <0.5 <2.0 <0.50 <1.0 <0.50 <0.50 <0.50 <0.50
10/19/2015 <0.50 <0.50 <1.0 <0.50 <2.0 <0.50 <1.0 <0.50 <0.50 <0.50 <0.50
WSW-3 2/25/2014 <0.50 <0.50 <1.0 <0.50 <2.0 <0.50 <1.0 <0.50 <0.50 <0.50 <0.50
2/25/2014 <0.50 <0.50 <1.0 <0.50 <2.0 <0.50 <1.0 <0.50 <0.50 <0.50 <0.50
10/3/2015 <0.50 <0.50 <1.0 <0.50 <2.0 <0.50 <1.0 <0.50 <0.50 <0.50 <0.50
2/25/2014 <0.50 <0.50 <1.0 <0.50 <2.0 <0.50 <1.0 <0.50 <0.50 <0.50 <0.50
10/3/2015 <0.50 <0.50 <1.0 <0.50 <2.0 <0.50 <1.0 <0.50 <0.50 <0.50 <0.50
2/25/2014 <0.50 <0.50 <1.0 <0.50 <2.0 <0.50 <1.0 <0.50 <0.50 <0.50 <0.50
10/3/2015 <0.50 <0.50 <1.0 <0.50 <2.0 <0.50 <1.0 <0.50 <0.50 <0.50 <0.50
11/30/2009 <0.040 <0.060 <0.19 <0.11 <0.23 <0.080 NA 0.63 <0.10 <0.14 <0.080
12/6/2011 <0.054 <0.057 <0.17 <0.056 <0.094 <0.042 <0.032 0.52 <0.034 <0.038 <0.038
6/13/2012 <0.054 <0.057 <0.17 <0.056 <0.094 <0.042 <0.032 0.52 <0.034 <0.038 <0.038
2/25/2014 <0.50 <0.50 <1.0 <0.50 <2.0 <0.50 <1.0 <0.50 <0.50 <0.50 <0.50
10/19/2015 <0.50 <0.50 <1.0 <0.50 <2.0 <0.50 <1.0 <0.50 <0.50 <0.50 <0.50
1 600 500 20 6 70 3 0.4 70 400 400
Note:
Concentrations are reported in micrograms per liter (ug/L) or parts per billion (ppb)
Only contaminants detected above the method detection limits in water supply wells during previous monitoring events are shown
(Historical analytical results for the water supply wells shown and wells WSW-8 through WSW-11 and WSW-18 are included in Appendix II.)
Concentrations shown inbold exceed the corresponding North Carolina groundwater quality standard (2L Standard)
NA - Not Analyzed
J - Estimated Concentration
WSW-1
WSW-7
WSW-5
WSW-6
2L Standard
WSW-4
WSW-2
APPENDICES
APPENDIX I
Well Construction Log and Record
SILTY CLAY
tannish red
GRAVELLY SILT
SILTY CLAY
red
SILTbrownish tan, petroleum
odor
SILT
brown, petroleum odorstong
SILT
brown, wet, petroleumodor
36.00
38.00
45.00
Diameter:
Type:
Interval:
DRILLING CONTRACTOR:
DRILLING METHOD:
DATE COMPLETED:
Type:
Interval:
RISER CASING
0.00
Portland Cement
0-36'
Type:
Interval:
4¼" H.S.A.
5/31/16
GS
COMPLETION REPORT OF WELL No. AS-1
LATITUDE:
LONGITUDE:
TOP OF CASING ELEVATION:
DATUM:
LOGGED BY:
2"
0.010 PVC
40'-45'
Diameter:
Type:
Interval:
#2 sand
38'-45'
SEAL
Diameter:
Type:
Interval:
FILTERPACK
Bentonite36'-38'
Darren Cox
PROTECTIVE CASING
2"
PVC
0-45'
Type:
Interval:
SCREEN
GROUT
STRATA
WELL CONSTRUCTION DETAILS
DEPTH(ft.)ELEVATION(ft.)LEGENDDESCRIPTION
SYMBOLWELL
DETAILS
DEPTH(ft.)PROJECT:
PROJECT NO:
PROJECT LOCATION:
Williams Grocery
4305-14-239B
Hamptonville, North Carolina
Sheet 1 of 1
WATER LEVEL:
0
5
10
15
20
25
30
35
40
TOCGSBS
BOCTSC
BSC
TDCG
TOP OF CASINGGROUND SURFACEBENTONITE SEAL
BASE OF OUTER CASINGTOP OF SCREEN
BOTTOM OF SCREEN
TOTAL DEPTHCEMENT GROUT
LEGEND
FILTER PACK
BENTONITE
CEMENT GROUT
CUTTINGS / BACKFILL
STATIC WATER LEVEL
COMPLETION REPORT OF
WELL No. AS-1
MONITORING WELL WILLIAMS GROCERY 4305-14-239B.GPJ WITH CPT.GDT 6/16/16Sheet 1 of 1
APPENDIX II
MMPE/Air Sparge Report

ADVANCED
ENVIRONMENTAL SERVICES, INC.
“Your Environmental Solutions Partner”

MOBILE
MULTI-PHASE
EXTRACTION REPORT

Site Location:

Williams Grocery
2425 Highway 21
Hamptonville, NC

Prepared for:

S&ME Inc.
44 Buck Shoals Road, Suite C-3
Arden, NC 28704
PM – Mr. David R. Loftis, PE

July 3, 2016

TABLE OF CONTENTS

EVENT SUMMARY

MMPE FIELD LOG

MASS-REMOVAL CALCULATION

FIELD NOTES

DISPOSAL MANIFESTS

MOBILE MULTI-PHASE EXTRACTION
EVENT SUMMARY

July 3, 2016

Location: Williams Grocery
2425 Highway 21
Hamptonville, NC

Client: S&ME Inc.
44 Buck Shoals Road, Suite C-3
Arden, NC 28704

Event Dates: June 20 - June 24, 2016
Advanced Job # 06 - 1640

Advanced Personnel: Lee Heilig and Jason Johnson

MMPE System: MMPE system rated 21” hg at 130 CFM
4’ discharge stack - 2” diameter
5,000 - gallon tanker
120 ft. piping 1 1/2” hose to 3 wells

Extraction Well: MW-1, MW-3 and RW-1

Well Initial FP / WL(ft) Final FP / WL(ft) Stinger depth(ft) Run Time
/ Changed To
MW-1 22.25 22.04 24/20 96.0 hours
MW-3 22.77 24.22 24/20 96.0 hours
RW-1 22.74/22.75 25.33 24/19 96.0 hours

Description of Event:
The MMPE event ran from 11:05 June 20, through 11:05 June 24, 2016. The MMPE system was
active for 96.0 hours. During the event vacuum at the recovery pump ranged from 11.0 to 20.0
inches of mercury (hg) and stabilized at approximately 15.0 inches of mercury. Airflow rates
ranged from 3,200 to 4,200 feet per minute and stabilized at approximately 3,700 feet per
minute. System temperature ranged from 88.0 – 115.0 degrees F and humidity maintained at 99
percent. Field gauged volatile organic compounds (VOC’s) emissions decreased from 100,000 to
78,000 parts per-million (PPM) throughout the event.

Groundwater / Product Mix Recovered:
During the event a total of 4,689 gallons of product/water mix were removed from the site and
properly disposed at a certified North Carolina disposal facility. An estimated 15.0 gallons of
free product was recovered as liquid. Total fluids recovered, was measured based on stick
readings conducted during and following the event. Based on 96.0 hours of operation and a total
of 4,689 gallons recovered, the average groundwater recovery rate was calculated to be
approximately 48.84 gallons per hour.

Events Results:
Based on mass-removal calculations 1,445.88 pounds or 235.03 gallons of VOC’s were
removed as vapor. An additional 15.0 gallons of free product was recovered as liquid. Using
Dwyer magnehelic gauges, vacuum influence (inches of water) was measured at monitoring
points MW-2 and MW-4. No measurable vacuum influence was observed at any monitoring
point. Draw-down was not identified at any monitoring point, groundwater mounding was
identified. Following the event no free product was identified in any well.

MMPE FIELD LOG:
CLIENT: S&ME Inc.
JOB NAME: Williams Grocery
LOCATION: Hamptonville, NC
MMPE EVENT DATES: June 20 - June 24, 2016
EXTRACTION POINTS: MW-1, MW-3 and RW-1
AES JOB NUMBER: 06 - 1640
DATE TIME FLOW (f/m) HUM.(%) TEMP. (F)VOC's(ppm)VAC. (hg")GALLONS STINGER/WL's EXTRACTION POINTS (hg")
MW-1 MW-3 RW-1
Stinger(ft)24,20 24,20 24,19
Start 11:05 Initial WL's 22.25 22.77 22.74/22.75
06/20/16 11:35 3,200 99.0 88 100,000 20.0 11.0 12.0 10.0
15:10 3,500 99.0 105 92,000 18.0 389 gal.8.0 8.0 10.0
06/21/16 8:30 3,600 99.0 115 100,000 15.0 645 gal.10.0 7.0 13.0
13:30 3,500 99.0 108 100,000 16.0 11.0 8.0 13.0
06/22/16 8:45 3,700 99.0 108 100,000 14.0 1,546 gal.11.0 9.0 13.0
13:30 3,500 99.0 115 94,000 15.0 11.0 9.0 13.0
06/23/16 8:00 4,000 99.0 108 100,000 13.0 3,005 gal.11.0 8.0 13.0
13:30 3,800 99.0 113 82,000 14.0 11.0 8.0 13.0
06/24/16 8:30 4,100 99.0 103 78,000 11.0 4,102 gal.11.0 9.0 13.0
10:00 4,200 99.0 105 84,000 11.0 12.0 10.0 13.0
End 11:05 Final WL's 22.04 24.22 25.33
Total fluids: 4,689 gal.
Total free product:15 gal.
DATE TIME STINGER/WL's EXTRACTION POINTS (hg") cont. VACUUM INFLUENCE (h2o") WELL GAUGING (ft)
MW-2 MW-4 MW-2 MW-4
Start 11:05 Stinger(ft)
Initial WL's
06/20/16 11:35 0.00 0.00 22.53 22.86
06/21/16 8:30 0.00 0.00 22.55 22.63
06/22/16 8:45 0.00 0.00 22.56 22.73
06/23/16 8:00 0.00 0.00 22.44 22.78
06/24/16 8:30 0.00 0.00 22.48 22.79
Final Wl's
End 11:05
Page 1 of 1
MOBILE MULTI-PHASE EXTRACTION EVENT
SITE NAME: WILLIAMS GROCERY CLIENT: S&ME INC.
INCIDENT NUMBER:
AVERAGE DEPTH TO GROUNDWATER: 22 - 23 FEET
DESCRIBE SOIL IN THE SATURATED ZONE:
AVERAGE HYDRAULIC CONDUCTIVITY (if known):
EXTRACTION WELLS USED FOR MMPE: MW-1, MW-3 AND RW-1
SPECIFICATIONS OF THE MMPE SYSTEM (cfm @ in Hg): 130 cfm @ 21.0"Hg
DRY STANDARD CUBIC FEET PER MINUTE (DSCFM) AIR FLOW CALCULATIONS (Qstd)
Date Hours Vacuum Velocity Pipe ID Temp Rel Humid Water Water Qstd(inches of Hg)(ft/min)(in)(°F)(%)Vapor (Wt%)Vapor (Vol%)(flow)
6/20/16 24.00 19.00 3350.00 2 97 99.0 0.038 0.026 67
6/21/16 48.00 15.50 3550.00 2 112 99.0 0.062 0.024 70
6/22/16 72.00 14.50 3600.00 2 112 99.0 0.062 0.024 71
6/23/16 96.00 12.00 4025.00 2 108 99.0 0.054 0.027 79
6/24/16
NOTES
Qstd = Flow at DSCFM
Vacuum = The level of vacuum being applied should be recorded from the MMPE system (inches of Hg)
Velocity = The rate at which air flows is measured at the blower discharge piping (anemometer or pitot tube)
Pipe ID = The inside diameter of the blower discharge piping (from the MMPE system)
Temperature = The temperature of the air stream exiting the blower discharge piping (dry bulb temp., in deg.°F)
Relative humidity = The % relative humidity of the air stream exiting the blower discharge piping
Bwsw = water vapor % by weight, i.e., pounds of water per pound of dry air, derived from the Psychrometric chart (temp Vs relative humidity)
Bws = water vapor % by volume
EQUATIONS
Bws = (Bwsw/18 lb-mole H20)/[(1/28.84 lb-mole dry air) + (Bwsw/18 lb-mole H2O)]
Qstd = (1-Water Vapor) * velocity * (PI * (diameter/24)2) * (528°R/(Temp + 460))
EMISSION CALCULATIONS
Elapsed
Time Flow PPMmeasured PPMwet PPMdry K PPMconc Cc:m Cc PMRc PMRg PMR
(hour)(DSCFM)(ppm)(#C - gas)(mg/dsm3)(lb/dscf)(lb/hour)(lb/hour)(lb)
24 67 96000 96000 98563 1 98563 49179 0.003070241 12.43 14.39 345.26
48 70 100000 100000 102459 1 102459 51123 0.003191615 13.36 15.46 371.13
72 71 97000 97000 99385 1 99385 49589 0.003095866 13.14 15.21 365.06
96 79 86000 86000 88386 1 88386 44101 0.002753251 13.12 15.18 364.42
Total emissions in pounds 1445.88
Total emissions as gallons (pounds / 6.152)235.03
NOTES
PPMmeasured = Actual measurements (ppm) taken with a OVA or TVA at the blower discharge piping
PPMwet = "wet" concentration
PPMdry = "dry" concentration
K = Number of carbons in calibration gas: (Methane K = 1, or Propane K = 3, or Hexane K = 6)
PPMc= PPMv, Volumetric concentration of VOC emissions as carbon, dry basis at STP
Cc:m = mg/dsm3, mass concentration of VOC emissions as carbon
Mc = 12.01 mg/mg-mole, molecular weight of carbon
K3 = 24.07 dsm3/106 mg-mole, mass to volume conversion factor at STP
Cc = lb/dcsf, mass concentration of VOC emissions as carbon, dry basis at STP
PMRc = lb/hr, pollutant mass removal rate of VOC's as carbon
PMRg = lb/hr, pollutant mass removal rate of of VOC's as gasoline
PMR = lb, pollutant mass removal of VOC's as gasoline
EQUATIONS
PPMwet = PPMmeasuredPPMdry = (PPMwet)/(1-Bws)
PPMc = (PPMd)(K)
Cc:m = (PPMc)(Mc / K3)
Cc = (Cc:m)(62.43x10-9 lb-m3/mg-ft3)
PMRc = (Cc)(Qstd)(60 minute/hour)
PMRg = (PMRc)(Mg/Mcg)
PMR = (PMRg)(#hours)
APPENDIX III
Field Forms

TO:

THE FOLLOWING WAS NOTED:

Project

Location

Date

Job No.

Weather Temp.
Present at Site:

PAGE _____ of _____
NOTES:
FIELD REPORT
S&ME, Inc.
9751 Southern Pine Blvd.
Charlotte, North Carolina 28273
[phone] Fax [phone]

ATTACHMENTS: _____________________
COPIES TO: _________________________ SIGNED: _____________________________ The presence of S&ME in the field shall not be construed as an acceptance or approval of activities at the site. S&ME is in the field to perform specific services and has certain responsibilities which are limited to those specifically authorized in our agreement with our Client. In no event shall S&ME be responsible for the safety or the means and methods of other parties in the field.

S&ME SFP-001 (REV. 6/2014)
Williams Grocery
2425 US HWY 21 Hamptonvile, N.C.
6-20-16 4305-14-239B
Clear 90s
M Brundage and AES personnel
David Loftis
1 1
0945 MB on site. Gauge wells MW-1, MW-3 and RW-1.
Well ID. DTP. DTW Well ID. DTP. DTW
MW-1. NP. 22.25. MW-4. NP. 22.91
MW-3. NP. 22.77. MW-2. NP. 22.86
RW-1. 22.74. 22.75
1010 AES on site. Assist AES in set up of hoses, lines and traffic control.
Conduct brief tailgate safety meeting. Discuss hazards of all equipment and site.
Start Vac on wells at 11:05. All stingers set at approx 24.0 fbg
Well ID. Vac. Sparge data. EFF VOCs
MW-1. 15hg SP-1 18psi/ 6CFM Pre sparge start =. >100,000ppm
MW-3. 15hg
RW-1. 15hg. Post sparge start up =. >100,000ppm
Wells generating lots of foam, foam causing floats on system to not activate. Need to watch pump.
Waiting to start sparge, until foam settles out.
Start sparge get at 14:25 . Running at 18/20 psi and getting 5 scfm. Approx 180 degrees f.
Will slowly increase air sparging every 30 min until its increased to approx 8 cfm
Could only get maximum of 6 CFM.
MB off site at 1730
S&ME, INC. / 3718 Old Battleground Road / Greensboro, NC 27410 /p 336.288.7180 /f 336.288.8980/ www.smeinc.com
On site at 1200 hrs.
On site to check product levels in three monitor wells and sample wells without any free
product.. I opened the wells and let the levels equilibrate before recording. MW-1 had
free product and was not sampled. MW-3 and RW-1 were purged and sampled with
disposable plastic bailers and nylon twine. I stored the samples in a cooler on ice as they
were collected.
Location Product Level Water Level Product Thickness
MW-1 22.26 22.49 .23
Off site at 1400 hrs.
Time Billed: 3.0 hrs Mileage Billed: 100
Environmental Field Report
Date 7-21-16 Job Number 4305-14-239B
Project Name / Location Williams Groceryt
Notes taken by
Gary Simcox
Weather/Temp Sunny 90*F
Present at site Gary Simcox
Monitor Well Sampling Form
Client:S&ME Project No.:Weather Conditions:
Site Name:
Site Address:
Well ID / Diameter
Collection Order
Total Well Depth (ft)
Depth to Water (ft)
Water Column (ft)
Well Volume (X3)
Volume Purged (gal)
Purge Time Interval
pH v1 5.30 v4 v1 4.59 v4 v1 v4 v1 v4 v1 v4
v2 4.98 v5 v2 4.61 v5 v2 v5 v2 v5 v2 v5
v3 4.83 v6 v3 4.68 v6 v3 v6 v3 v6 v3 v6
Temp.oC v1 18.90 v4 v1 18.10 v4 v1 v4 v1 v4 v1 v4
v2 18.60 v5 v2 17.90 v5 v2 v5 v2 v5 v2 v5
v3 18.80 v6 v3 18.00 v6 v3 v6 v3 v6 v3 v6
Specific v1 370.00 v4 v1 146.00 v4 v1 v4 v1 v4 v1 v4
Conductivity v2 358.00 v5 v2 147.00 v5 v2 v5 v2 v5 v2 v5
v3 345.00 v6 v3 150.00 v6 v3 v6 v3 v6 v3 v6
Purge Rate In.Fin.In.0.59 Fin.In.Fin.In.Fin.In.Fin.
Final Turbidity (ntu)4.61
Well Condition
Date/Time Collected 1305 1350
Field Calibration Date/Time:Date/Time:18 Date/Time:Date/Time:Date/Time:
pH pH pH pH pH
C C C C C
DO DO 150 DO DO DO
Tur.Tur.Tur.Tur.Tur.
Preservative
Sampler's Name:
Comments:Well Dia.(in) Gal/ft1.25 0.0642 0.163
4 0.6538 2.61110 4.08
Well Vol. (gal.) = 3.141(dia.(ft)/2)2 X Water Col. X 7.48 gal/ft3
Sampler Signature(s):
Sunny 90*F
MW-3 2"
Well cover is broken
4,7
NCDENR 4305-14-239B
Williams Grocery
2425 US Highway 21, Hamptonville, NC
32.4 28.4
RW-1 4"
07/21/16
9.62
22.75
11.14.7
5.65
22.78
4.6818.1
01/17/00
Gary Simcox
07/20/16 07/20/16
5/25/1900
147
Gary Simcox
1413
Gary Simcox
APPENDIX IV
Laboratory Report
Page 1 of 20
Table of Contents
Table of Contents
Sample Summary 3
Hits Only Report 4
Case Narrative 5
Sample Results 6
16G1106-01 6
16G1106-02 8
Sample Preparation Information 10
QC Data 11
Volatile Organic Compounds by GC/MS 11
B154718 11
Flag/Qualifier Summary 15
Certifications 16
Chain of Custody/Sample Receipt 18
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