WS-3748_12330_CA_RPTS_20150406

April 6, 2015

Mr. Herbert Berger
NCDENR, Division of Waste Management, UST Section
1637 Mail Service Center
Raleigh, North Carolina 27699-1637

Reference: Groundwater Monitoring Letter
Kodell’s Grocery
7150 NC Highway 89
Westfield, Stokes County, North Carolina
NCDENR Incident No. 12330
NCDENR Contract No. N14007i-C
ECS Project No. 09.25088

Dear Mr. Berger:

As authorized by Task Authorization Request (TAR) No. 2 dated January 21, 2015, ECS
Carolinas, LLP (ECS) recently installed one additional Type II groundwater monitoring well,
surveyed the new well’s relative elevation and collected a groundwater sample from the well
located at Kodell’s Grocery in Westfield, Stokes County, North Carolina (Figures 1 and 2). This
letter, with attachments, is the report of our sampling.

FIELD ACTIVITIES

On February 9, 2015, personnel from ECS mobilized to the site to install, survey and sample
one additional Type II groundwater monitoring well (MW-5) on the north downgradient side of
the site (Figure 2). The well was installed using a Geoprobe® drill rig equipped with solid stem
augers. The drilling contractor was 3D Environmental Investigations, LLC. The boring for the
well was driilled to a depth approximately 32 feet below ground surface (bgs). The Type II well was
constructed with two-inch I.D. Schedule 40 PVC flush-threaded casing and screen. The PVC
screen and casing was lowered into the open borehole. A 15-foot length of slotted well screen with
machined 0.010-inch slot widths and a threaded bottom plug was installed at the bottom of the
borehole. The screen was installed to a depth such that the screened interval intersected the
estimated groundwater surface as encountered during drilling activities. A solid section of PVC
casing was placed above the screened interval and extended to a point just below the ground
surface. The annular space around the well was filled with a washed and graded medium sand to
approximately two feet above the top of the screen. Copies of the boring log and well construction
diagram are attached.

A minimum two-foot thick seal of bentonite pellets was placed above the sand pack. After
placement in the well, the bentonite pellets were allowed to hydrate. After hydrating the bentonite
pellets, a bentonite/neat cement mixture was poured down the borehole to fill the annular space
from the bentonite seal to the ground surface. The top of the well casing was equipped with a
Groundwater Monitoring Letter
Kodell’s Grocery
7150 NC Highway 89
Westfield, Stokes County, North Carolina
NCDENR Incident No. 12330
ECS Project No. 09.25083
April 6, 2015

lockable, water-tight well plug and a flush-mounted protective steel cover was installed over the
well.
Approximately 4 hours following installation, the well was gauged and sampled. Prior to
sampling, the depth to water was measured in the monitoring well using an electronic water
level meter. The depth to water was measured approximately 22.69 feet, below the top of
casing. Well construction information and depth to groundwater are summarized in Table 1.
The Non Residential Well Construction Record (Form GW-1b) is attached

The monitoring well was purged by removing five well volumes with a disposable bailer and nylon
cord. After purging was completed, a groundwater sample was collected from the well and
transferred into sample containers provided by the laboratory. The Groundwater Monitoring Well
Sampling Data Sheet is attached. The sample containers were labeled with ECS project
number, sample identification, sample date and time, and requested analytical analysis. The
containers were placed into protective packaging material and placed into a cooler with ice to
maintain the samples at approximately 4 Celsius (C). The groundwater sample was submitted
to Research and Analytical Laboratories (R&A Labs) in Kernersville, North Carolina (NC
certification #34) for chemical analysis. The groundwater sample was analyzed for volatile
organic compounds (VOCs) using Standard Method 6200B plus IPE, MTBE, and EDB.
Proper chain-of-custody (COC) procedures were followed from sample collection through the
transportation process. A copy of the COC is attached.

The relative elevation of the top of the new well casing was measured to the nearest 0.01 feet
using a level and rod. The elevations were measured relative to an arbitrary benchmark, which
was assigned an elevation of 100 feet. The calculated well elevation is summarized in Table 1.

RESULTS

Laboratory analysis detected benzene, ethylbenzene, naphthalene, styrene, toluene, 1,2,4-
trimethylbenzene, and total xylenes at concentrations exceeding their NC 2L Groundwater
Standards (NC2LGWQS) in MW-5. 1,3,5- trimethylbenzene and n-propylbenzene were
detected above the laboratory method detection limit but below their NC2LGWQSs. The
concentrations do not exceed the Gross Contamination Levels (GCLs). The analytical results
are summarized in Table 2 and the geochemical parameters are summarized in Table 3. The
laboratory report is attached.
SOURCE:
USGS TOPOGRAPHIC MAP
STEWART SE, DATE 1968 REVISED 1938; HANGING
ROCK, DATED 1964 REVISED 1977; PILOT
MOUNTAIN, DATE 1964 REVISED 1977,
CLAUDVILLE, DATED 1968 REVISED 1977;NC
QUADRANGLES
FIGURE 1
SITE LOCATION MAP
KODELL’S GROCERY
NC HIGHWAY 89
WESTFIELD, STOKES COUNTY, NORTH
CAROLINA
NCDENR INCIDENT # 12330
ECS PROJECT NO. 09-25088
SITE
APPROXIMATE SITE BOUNDARY
SCALE (IN FEET)
2,000 1,000 0 2,000
SOURCE:
STOKES COUNTY GIS DEPARTMENT
AERIAL PHOTOGRAPH, DATED 2010
FIGURE 2
MONITORING WELL LOCATION MAP
KODELL’S GROCERY
NC HIGHWAY 89
WESTFIELD, STOKES COUNTY, NORTH
CAROLINA
NCDENR INCIDENT # 12330
ECS PROJECT NO. 09-25088
APPROXIMATE SITE BOUNDARY
MW-3
MW-1
MW-4
MW-2
SCALE (IN FEET)
140 70 0 140
MW-5
KODELL'S GROCERY
WESTFIELD, NC
NCDENR INCIDENT #12330
ECS PROJECT # 09-25088
WELL ID #
DATE
WATER
LEVEL
MEASURED
TOP OF
CASING
ELEVATION
(ft.)
APPROXIMATE
CONSTRUCTED
WELL DEPTH
(ft.)
SCREENED
INTERVAL (ft
BLS)
DEPTH TO
WATER
FROM TOP
OF CASING
(ft.)
MEASURED
GROUNDWATER
ELEVATION (ft.)
6/14/2010 24.46 75.54
2/24/2012 25.79 74.21
6/7/2012 25.22 74.78
1/8/2013 26.43 73.57
9/19/2014 24.9 75.1
6/14/2010 24.7 76.32
2/24/2012 26.18 74.84
6/7/2012 27.86 73.16
1/8/2013 26.84 74.18
9/19/2014 25.35 75.67
6/14/2010 23.69 74.29
2/24/2012 24.8 73.18
6/7/2012 24.31 73.67
1/8/2013 25.37 72.61
9/19/2014 24.1 73.88
6/14/2010 21.38 74.5
2/24/2012 22.52 73.36
6/7/2012 21.97 73.91
1/8/2013 23.18 72.7
9/19/2014 21.6 74.28
MW-5 2/9/2015 95.75 32 17-32 22.69 73.06
Monitoring Well data and Top of Casing elevation was collected from Phase II LSA conducted by
TABLE 1: SUMMARY OF MONITORING WELL DATA
20-40
15-35
15-35
15-3535
35
35
MW-4
MW-2
95.88
40
101.02
MW-3 97.98
MW-1 100
KODELL'S GROCERYWESTFIELD, NCNCDENR INCIDENT # 12330ECS PROJECT #09-25088Sample IdentificationMW-5Sample Date 03/04/10 06/14/10 02/24/12 06/07/12 01/08/13 09/19/14 06/14/10 02/24/12 06/07/12 01/08/13 09/19/14 06/14/10 02/24/12 06/07/12 01/08/13 09/19/14 06/14/10 02/24/12 06/07/12 01/08/13 09/19/14 02/09/15Benzene<4.0 <5.4ND22 4.5<0.5 ND ND ND ND <0.51,600 1,800 2,000 802 460ND ND ND ND <0.5381 5,000Toluene3,900 2,500 6,200 4,100 3,200435 ND ND ND ND <0.526,000 40,000 46,000 22,600 21,600ND ND ND ND <0.55,600600 260,000Ethylbenzene6,200 3,700 2,200 1900 1,190280 ND ND ND ND <0.51,600 2,600 28,00 2,060 2,040ND ND ND ND <0.5830600 84,500Total Xylenes30,000 18,500 9,100 7,400 5,460 1,540ND ND ND ND <19,100 13,000 15,000 10,840 9,490ND ND ND ND <14,000500 85,500Methyl Tertbutyl Ether ND 79J ND ND 3.3 <0.5 ND ND ND ND <0.5 ND ND ND 2.9 <.5 ND ND ND ND <0.5 <0.5 20 20,000Isopropyl Ether NA NA NA ND ND <0.5 NA NA ND ND <0.5 NA NA 13 13 <.5 NA NA ND ND <0.5 <0.5 70 70,000EDB (504.1) NA NA NA ND ND <0.5 NA NA ND ND <0.5 NA NA ND ND <.5 NA NA ND ND <0.5 <0.5 0 50Styrene440 210 210 110ND 19.7 ND ND ND ND <0.5300 430 560ND360ND ND ND ND <0.510470 70,000AcetoneNA NA NA ND ND <25 NA NA ND ND <25 NA NA100ND <25 NA NA ND ND <25 <25 6 6MNaphthalene NA NA NA550 472 83.7NA NA ND ND <0.5 NA NA400 371J 265NA NA ND ND <0.51006 6,000n-Butylbenzene84J54 61 46 ND 8.1 ND ND ND ND <0.5 ND 20 15 ND <.5 ND ND ND ND <0.5 <0.5 70 6,900sec-Butylbenzene 51 ND 49J 26 ND 6.8 ND ND ND ND <0.5 ND 17 7.5 ND <.5 ND ND ND ND <0.5 <0.5 70 8,500Isopropyl Benzene380 280 190 180 13931.8 ND ND ND ND <0.5 41 7071 70.646.8 ND ND ND ND <0.5 <0.5 70 25,000p-Isopropyltoluene NA NA NA30ND 12.5 NA NA ND ND <0.5 NA NA 12 ND <.5 NA NA ND ND <0.5 <0.5 25 1,700n-Propylbenzene1,200 820 520 540 369 107ND ND ND ND <0.5120 170 200 192 135ND ND ND ND <0.5 69.5 70 30,0001,2,4-Trimethylbenzene9,500 5,700 3,400 2,400 2,310 522ND ND ND ND <0.51,1006.71,300 1,340 987ND ND ND ND <0.5488400 28,5001,3,5-Trimethylbenzene2,600 1,700 1,000 1,000 2,490188 ND ND ND ND <0.5 330 390510 1,260299 ND ND ND ND <0.5 149 400 25,000Naphthalene1,900 1,300 770NA NA NA ND NA NA NA NA250 430NA NA NA ND ND NA NA NA NA 6 6,0002-Methylnaphthalene1,100 370ND NA NA NA ND NA NA NA NA30JND NA NA NA ND ND NA NA NA NA 30 12,500Lead75 55NA NA NA NA ND NA NA NA NA20NA NA NA NA ND NA NA NA NA NA 15 15,000C5-C8 Aliphatics12,000 12,000NA NA NA NA ND NA NA NA NA50,000NA NA NA NA ND NA NA NA NA NA 400 NLC9-C12 Aliphatics91,000 41,000NA NA NA NA ND NA NA NA NA23,000NA NA NA NA ND NA NA NA NA NA 700 NLC9-C18 Aliphatics1,900590 NA NA NA NA ND NA NA NA NA ND NA NA NA NA ND NA NA NA NA NA 700 NLC19-C36 Aliphatics ND ND NA NA NA NA ND NA NA NA NA ND NA NA NA NA ND NA NA NA NA NA 10,000 NLC9-C10 Aromatics29,000 22,000NA NA NA NA ND NA NA NA NA5,100NA NA NA NA ND NA NA NA NA NA 200 NLC11-C22 Aromatics3,000 1,500NA NA NA NA ND NA NA NA NA230NA NA NA NA ND NA NA NA NA NA 200 NLNotes:NC2LGWQS = North Carolina 2L Groundwater Quality Standard GCL = Gross Contaminant Level NL = No GCL EstablishedND = Not Detected Above the laboratory Method Detection LimitNA = Not Analyzed for This Compoundµg/l = micrograms per liter = ppb (parts per billion)J-Value = Estimated value between laboratory reporting limit and method detection limit BOLD = Concentration Exceeds NC2LGWQS6200B6106010BMW-2MADEP VPH/EPHMW-4 TABLE 2: SUMMARY OF GROUNDWATER ANALYTICAL RESULTS (MONITORING WELLS)MW-1NC2LGWQS GCLMW-3
CALIBRATED PENETROMETER
TONS/FT.
1 2 3 4 5+
SITE LOCATION
7950 NC Highway 89 West, Westfield, North Carolina
FID = 3.20
FID = 2.66
FID = 9.22
FID = 8.28
FID = 19.45
FID = NA
PLASTIC WATER LIQUID
LIMIT % CONTENT % LIMIT %
X----------------------------------------------------------
ROCK QUALITY DESIGNATION & RECOVERY
ROD % REC. % .
20% 40% 60% 80% 100%
STANDARD PENETRATION
BLOWS/FT.
10 20 30 40 50+ .
SHEET
1 OF 1
DRILLING METHOD – Geoprober
CAVE IN DEPTH @
BORING #
MW-5
RIG FOREMAN24 HOUR WL – NA
BORING COMPLETED – February 9, 2015WL(BCR) WL(ACR)
THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES IN-SITU THE TRANSITION MAY BE GRADUAL
BORING STARTED – February 9, 2015WL -NA WS OR WD
Light Brown Silt, Moist
1860SS5
Brown Silt
1860SS4
Boring Terminated at 32’ - Refusal
1860SS6
Same
1860SS3
Same
1860SS2
Red-brown Clayey Silt
1860SS1
SURFACE ELEVATION
DESCRIPTION OF MATERIAL ENGLISH UNITS
BOTTOM OF CASING LOSS OF CIRCULATION 100%
PROJECT GEOLOGIST
Randy H. Cavallier
PROJECT NAME
Kodell’s Grocery
JOB #
09.25088
CLIENT
NCDENR – State Leads
DEPTH (FT)SAMPLE NO.SAMPLE TYPESAMPLE DIST. (IN)RECOVERY (IN)WATER LEVELS ELEVATION (FT)0
5
10
15
20
25
Same, Wet
Project
Owner
Locking Cap Well No.
Location
MD Coordinators
State Permit No.
inch diameter Topography Setting
Ground Elevation
Drilled By
Well casing, Drilling Started
Drilling Completed
Method of Drilling
Type of Rig
Grout
Well No. MW-5
Hole Diameter 4.25 inches
Hole Depth 32 feet
Casing Diameter 2 inch
Casing Length 17 feet
Screen Diameter 2 inch
Screen Slot 0.01
Screen Type PVC
Surface Elevation
Screen Top El.
Screen Bottom El.
Well Status
Sand Pack
All Measuring Points are from the Ground
Surface Unless Otherwise Noted.
Kodell's Grocery
MW-5
GROUND SURFACE Westfield
MONITORING WELL CONSTRUCTION DIAGRAM
4 ft
15 ft
32 ft.
3D
0.01 slot
32.5 ft.
17 ft
Well Screen,
2 inch diamter
2/9/2015
Auger
Geoprobe
MONITORING WELL DATA
REMARKS
2/9/2015
4.25 inch diameter
2 inch diameter,
drilled hole
Bentonite
Well Diagram