WS-9069_44302_CA_RPTS_20150731_WSW-LetRpt

TransmittalLetter
Incident Manager: Linda Estkowski
Incident Name: Pagetown Exxon
Incident Number: 44302
Facility ID: 0-004296
Document: Water-Supply Well Sampling Report
Document Date: 7/31/15
Jeff Ballsieper
Progress Environmental, Inc.
P.O. Box 5884
Winston-Salem, North Carolina 27113
Phone [phone]
Fax[phone]
Water-Supply Well Sampling Report
Pagetown Exxon
Reidsville, North Carolina
Progress Project No. 1015059.002
2
TABLE OF CONTENTS
A SITE IDENTIFICATION..........................................................................................................................1
B SITE HISTORY, CHARACTERIZATION AND PURPOSE...............................................................3
C HISTORIC FREE PRODUCT GAUGING.............................................................................................3
D MOBILE MULTI-PHASE EXTRACTION (MMPE) ACTIVITIES..................................................4
E GROUNDWATER ASSESSMENT ACTIVITIES.................................................................................4
F REGIONAL GEOLOGY AND HYDROGEOLOGY............................................................................4
G SITE GEOLOGY AND HYDROGEOLOGY.........................................................................................5
H DETERMINATION OF GROUNDWATER FLOW DIRECTION ....................................................5
I CONCLUSIONS.........................................................................................................................................5
J RECOMMENDATIONS...........................................................................................................................6
FIGURES AND TABLES
Figure 1 - Topographic Site Map
Figure 2 - Site Plan
Figure 3 - Water-Supply Well Location Map
Figure 4 - Potentiometric Surface Map
Table B-1 - UST/AST System Information
Table B-2 - UST Owener/Operator Information
Table B-4 - Summary of Groundwater Analytical Results
APPENDIX
Laboratory Data and Chain-of-Custody Documentation
Water-Supply Well Sampling Report
Pagetown Exxon
Reidsville, North Carolina
Progress Project No. 1015059.002
3
B SITE HISTORY, CHARACTERIZATION AND PURPOSE
The site is located at 8035 Cherry Grove Road in Reidsville, Caswell County, North Carolina. The
site consists of a convenience store which stores petroleum products in underground storage tanks
(USTs) and aboveground storage tanks (ASTs) for retail sale. Formerly the kerosene and diesel
fuel were stored in USTs. The kerosene and diesel fuel USTs were removed following the
discovery of a release in 2014. Three active USTs are present at the site and used to store gasoline.
The site is located in a commercial and residential area of rural Caswell County. The surrounding
properties are served by water-supply wells within 1,500 feet of the source area. Progress
previously completed an Initial Abatement Action Report, dated July 24, 2014 and a Phase II
Limited Site Assessment, report dated November 26, 2014. The NCDENR issued a Notice of
Regulatory Requirements (NORR), dated December 4, 2014 requiring that a Comprehensive Site
Assessment (CSA) be completed. Following discussions with the NCDENR, it was determined
that prior to completing a CSA, free product recovery activities were to be performed and the
nearby water-supply wells sampled. This Water-Supply Well Sampling Report summarizes the
remediation and water-supply well sampling activities recently completed by Progress. A
description of the former UST systems is listed in Table B-1 below. Figure 2 depicts the site and
the location of the monitoring wells.
Table B-1
Site History, UST/AST System Information
Tank No.Installation
Date
Capacity
(gallons)
Construction
Materials
Dimensions
(inches)
Removal
Date Contents Previous
Contents
1 4/30/1989 6,000 Steel 63” x 216”Present Gasoline Gasoline
2 4/30/1989 8,000 Steel 63” x 216”Present Gasoline Gasoline
3 4/30/1989 4,000 Steel 63” x 216”Present Gasoline Gasoline
4 4/30/1989 2,000 Steel (STP-3) 64” x 12’6/16/14 Diesel Diesel
5 4/30/1989 1,000 Steel (STP-3) 64” x 6’6/16/14 Kerosene Kerosene
6 2014 (AST)500 Steel 64” x 12’Present Kerosene Kerosene
7 2014 (AST)1,500 Diesel Diesel
Table B-2
Site History, UST Owner/Operator Information
Owner’s Name Address Phone Number Dates of Ownership
Eden Oil Company, Inc.P.O. Box 1375
Reidsville, NC 27323 [phone] 1989-Present
C HISTORIC FREE PRODUCT GAUGING
Approximately 0.69 feet of free product was detected in monitoring well MW-1 during the LSA
sampling event on November 11, 2014.
On March 9, 2015, Progress gauged free product in monitoring well MW-1 prior to a Mobile
Multi-phase Extraction Event (MMPE). Approximately 2.92 feet of free product were detected.
Water-Supply Well Sampling Report
Pagetown Exxon
Reidsville, North Carolina
Progress Project No. 1015059.002
4
On April 13, 2015 Progress returned to the site to sample the surrounding water-supply wells and
gauge groundwater/free product levels in monitoring well MW-1, as appropriate. Approximately
1.71 feet of free product was detected in monitoring well MW-1.
D MOBILE MULTI-PHASE EXTRACTION (MMPE) ACTIVITIES
Progress previously completed a free product recovery event using MMPE from March 9 to March
13, 2015. Free product and groundwater were extracted from monitoring well MW-1. The event
extracted approximately 1,883 gallons of impacted groundwater and 96.060 pounds or 15.36
gallons of product as vapor.
E GROUNDWATER ASSESSMENT ACTIVITIES
On July 6, 2015 Progress returned to the site to sample the surrounding water-supply wells and
gauge groundwater/free product levels in monitoring well MW-1, as appropriate. Approximately
5.10 feet of free product was detected in monitoring well MW-1. Progress collected groundwater
samples from water-supply wells WSW-2, WSW-3, WSW-5, WSW-6, WSW-7, WSW-9, WSW-
10, WSW-12, WSW-13, WSW-14, WSW-15, WSW-16, WSW-17, WSW-20, WSW-22, WSW-23,
and WSW-24 (Figure 3). Water-supply wells WSW-4, WSW-8, and WSW-21 are no longer in
use. Information pertaining to the water-supply wells is included in Table B-5.
Prior to sampling, the water-supply wells were purged by allowing them to run for approximately
10 to 15 minutes. The groundwater samples were decanted into laboratory-supplied bottles and
placed into a cooler packed with ice. The cooler was delivered under chain-of-custody to Research
& Analytical Laboratories (R&A) for testing. R&A analyzed the groundwater samples for volatile
organic compounds (VOCs) by EPA Method 602 plus isopropyl ether (IPE) and methyl tert-butyl
ether (MTBE). Groundwater sample analytical results are included in Table B-4.
Laboratory analysis of the groundwater sample collected from water-supply wells WSW-2, WSW-
3, WSW-5, WSW-6, WSW-7, WSW-9, WSW-10, WSW-12, WSW-13, WSW-14, WSW-15,
WSW-16, WSW-17, WSW-20, WSW-22, WSW-23, and WSW-24 did not detect targeted
compounds above the laboratory detection limits. Laboratory analysis of the groundwater sample
collected from WSW-14 detected benzene (143 µg/L), total xylenes (225 µg/L), and naphthalene
(17.0 µg/L ). The concentrations of benzene and naphthalene exceed their respective North
Carolina 2L Groundwater Quality Standards (NC2LGWQS) of 1 µg/L and 6 µg/L, respectively. In
addition, the concentration of benzene exceeds the EPA Drinking Water Standard of 5 µg/L.
F REGIONAL GEOLOGY AND HYDROGEOLOGY
According to the Geologic Map of North Carolina, the subject site is located in the Carolina Stale
Belt of North Carolina. The rocks beneath the site have been characterized as metamorphosed
granitic rocks. Groundwater generally is stored in the pore space between individual grains of
residual soil and in the fractures within the underlying parent rock. Due to the intense shearing
associated with the thrust faulting in the area and the relatively shallow depths to bedrock, it can be
expected that the fractures playa major role in the flow of groundwater in the subsurface.
Recharge to the water table is primarily by precipitation infiltrating the upper soils and percolating
downward, under the influence of gravity, to the groundwater table. Typically, the water table is not a
Water-Supply Well Sampling Report
Pagetown Exxon
Reidsville, North Carolina
Progress Project No. 1015059.002
5
level surface, but a subdued reflection of the land surface. However, the depth to the water table is
not constant, and depends on many factors, which include the amount of rainfall, the permeability of
the soil, and the amount of groundwater being pumped in the area.
G SITE GEOLOGY AND HYDROGEOLOGY
Based on our review of the topographic map and on-site observation, the site is located on an east-
west trending ridge. Groundwater generally flows in directions sub-parallel to the ground surface
slopes and under the influence of gravity toward points of discharge such as creeks, swamps,
drainage swales, or pumped groundwater wells. Based on topographic inference, groundwater
beneath the site most likely flows to the southeast toward an intermittent tributary of Stony Creek.
(Figure 1).
H DETERMINATION OF GROUNDWATER FLOW DIRECTION
The tops of casing of each of the monitoring wells were previously surveyed to an accuracy of 0.01
foot referenced to an arbitrarily assigned benchmark (top of casing of monitoring well MW-3),
which was assigned an elevation of 100 feet above mean sea level. The elevations of the
monitoring wells and the water table are both relative to that benchmark. A groundwater elevation
map depicting the measured depths to the water table as measured in each of the wells was
constructed for the Phase II LSA and is provided as Figure 4. The map depicts the estimated
groundwater flow beneath the site to be generally towards the south-southwest.
I CONCLUSIONS
Based on the results of the groundwater sampling event, Progress makes the following
conclusions:
Approximately 5.10 feet of free product was detected in monitoring well MW-1 on July 6,
2015. Note that free product thickness has increased by approximately 3.39 feet since the
April 13, 2015 free product measurement.
Laboratory analysis of the groundwater sample collected from water-supply wells WSW-2,
WSW-3, WSW-5, WSW-6, WSW-7, WSW-9, WSW-10, WSW-12, WSW-13, WSW-14,
WSW-15, WSW-16, WSW-17, WSW-20, WSW-22, WSW-23, and WSW-24 did not
detect targeted compounds above the laboratory detection limits. Laboratory analysis of
the groundwater sample collected from WSW-14 detected benzene (143 µg/L), total
xylenes (225 µg/L), and naphthalene (17.0 µg/L). The concentrations of benzene and
naphthalene exceed their respective North Carolina 2L Groundwater Quality Standards
(NC2LGWQS) of 1 µg/L and 6 µg/L, respectively. In addition, the concentration of
benzene exceeds the EPA Drinking Water Standard of 5 µg/L.
The source of the petroleum-related compounds in water-supply well WSW-14 is not
known. Multiple potential sources of contamination are present within 500 feet of water-
supply well WSW-14. Water-supply well WSW-14 is located approximately 285 feet to
the east of the subject kerosene release. The groundwater flow direction beneath the
subject site has been calculated to be to the south-southwest. Furthermore, laboratory
analysis of a groundwater sample collected from monitoring well MW-2, located generally
Water-Supply Well Sampling Report
Pagetown Exxon
Reidsville, North Carolina
Progress Project No. 1015059.002
6
in the direction of WSW-14, did not detect targeted petroleum-related compounds above
the laboratory quantitation limits during the Phase II LSA sampling event.
J RECOMMENDATIONS
Based on the remaining amount of free product, Progress recommends the following:
The current property owner should be notified and a copy of this report should be submitted
to the NCDENR for their review;
the laboratory results for water-supply well WSW-14 should be evaluated by the State
Toxicologist and the propertyowner/tenant notified; and,
continuing active remediation using MMPE to reduce free product beneath the site.
Progress will not complete additional activities at the site until pre-approved bythe NCDENR.
FIGURES
Figure 1
Topographic Site Map
Pagetown Exxon
8035 Cherry Grove Road
Reidsville, Caswell County, North Carolina
P.O. Box 5884
Winston-Salem, NC 27113
Telephone: [phone]
Fax: [phone]
www.progressenvironmental.com
United States Department of the Interior
USGS 7.5 Minute Series Topographic MapContour Interval: 10 feet
Scale: 1”=2000’
Cherry Grove, North Carolina
Date: 1997
Project: Pagetown Exxon
Client: Eden Oil Company
Progress Job #: 1015059.002
Date: July 2015
SITE
Site
REV
0
DRAWINGTITLE
DRAWINGNUMBER
FIGURE2
LEGEND
ApproximateMonitoring
WellLocation
DispenserCanopy
Product Dispenser
SitePlanPagetownExxon
8035 CherryGroveRoadReidsville, NorthCarolina
DR.: JAB JULY15
CK.:
APP'D.:
SCALE:SHOWN
PROGRESSNO.: 1015059.002
www.progressenvironmental.com
P.O. Box5884Winston-Salem,NorthCarolina27113(336)722-9999
Progress
Environmental,Inc.
N
EW
MW-1
MW-4
MW-3
MW-2
MW-4
ProgressENVIRONMENTAL,INC.JSL1015059.002JULY2015JABASSHOWNJULY2015Figure2.SKFP.O.Box5884WINSTON-SALEM,NORTHCAROLINA27113PHONE[phone]FAX[phone]FIGURE3WATER-SUPPLYWELLLOCATIONMAP8035CHERRRYGROVEROADREIDSVILLE,NORTHCAROLINAPROJECTAPPROXIMATE OBSERVED WATER-SUPPLY WELLLOCATION
PLEASE NOTE: BASED ON MUNICIPAL WATER NOT BEING PRESENT IN THE VICNITY OF THE SITE,EACH RESIDENCE OR BUSINESS IS CONSIDERED TO UTILIZEAWATER-SUPPLY WELL FOR ITS SOURCE OF DRINKING WATER.THE OWNER INFORMATION IS PROVIDED IN TABLE B-5AS OBTAINED FROMTHE CASWELL COUNTY GIS.
18
19
1
2
3
22
5
6
7
9
10
11
12 13
1415
16
17
20
23
24
18
19
REV
0
DRAWINGTITLE
DRAWINGNUMBER
FIGURE4
LEGEND
Approximate MonitoringWellLocationandCalculatedGroundwater Elevation
Dispenser Canopy
Product Dispenser
PotentiometricSurfaceMapPagetownExxon
8035CherryGroveRoadReidsville, NorthCarolina
DR.: JAB JULY15
CK.:
APP'D.:
SCALE:SHOWN
PROGRESSNO.: 1015059.002
Pleasenote: MW-1was not usedinthecalculationduetothepresenceof freeproduct.
Groundwater ContourandElevation
CalculatedGroundwater FlowDirection
Contour Interval =1.00feet
InferredGroundwater Contour Elevation
www.progressenvironmental.com
P.O. Box5884Winston-Salem,NorthCarolina27113(336)722-9999
Progress
Environmental,Inc.
N
EW
MW-1
MW-4
MW-3
MW-2
MW-4
78.24
77.46
75.95
FP
75.95
76.00
76.00
77.00
78.00
TABLE
Well ID Date Collected
(m/dd/yy)
Depth to Water
(Ft. Below TOC)
11/11/2014 FP (0.69') FP FP FP FP FP FP FP FP FP FP
4/13/2015 FP (1.71') FP FP FP FP FP FP FP FP FP FP
7/6/2015 FP (5.10') FP FP FP FP FP FP FP FP FP FP
MW-2 11/12/2014 21.61 BQL BQL BQL BQL BQL See Data BQL BQL 111 BQL
MW-3 11/12/2014 22.54 BQL BQL BQL BQL BQL See Data BQL BQL BQL BQL
MW-4 11/12/2014 23.15 BQL 1.94 2.15 12.3 BQL See Data BQL 402 109 BQL
WSW-2 7/6/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
WSW-3 7/6/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
4/13/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
7/6/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
4/13/2015 -- NA NA NA NA BQL NA NA NA NA NA
7/6/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
4/13/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
7/6/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
WSW-9 7/6/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
WSW-10 7/6/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
4/13/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
7/6/2015 --BQL BQL BQL BQL BQL NA NA NA NA NAEthylbenzeneTolueneMW-1
WSW-5
WSW-6
Table B-4
Summary of Groundwater Analytical Results
Pagetown Exxon
EPH & VPH
Water-Supply Well Sampling Report
C9-C22AromaticsC19-C36AliphaticsTotalXylenesAnalytical Method
TICsDetected602
Benzene625BNA+10 TICs
WSW-7 NaphthaleneC9-C18AliphaticsC5-C8AliphaticsContaminant of Concern
WSW-12 7/6/2015 --BQL BQL BQL BQL BQL NA NA NA NA NA
WSW-13 7/6/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
4/13/2015 --21.7 BQL BQL 31.6 BQL NA NA NA NA NA
7/6/2015 --143 BQL BQL 225 17.0 NA NA NA NA NA
4/13/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
7/6/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
WSW-16 7/6/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
WSW-17 7/6/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
4/13/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
7/6/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
4/13/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
7/6/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
WSW-23 7/6/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
WSW-24 7/6/2015 -- BQL BQL BQL BQL BQL NA NA NA NA NA
1 600 600 500 6 N/A 400 700 200 10,000
5,000 84,500 260,000 85,500 5,000 N/A NS NS NS NS
5 700 1,000 10,000 NS N/A NS NS NS NS
= Detected Concentration Exceeds the North Carolina 2L Groundwater Quality Standards (NC2LGWQS) or the EPA Drinking Water Standard
BQL = Below Quantitation Limits
Results are reported in µg/l
µg/L = micrograms per liter
GCL = gross contamination level
TOC = top of casing
NS = No Standard
N/A = Not Applicable
EPH and VPH = Extractable and Volatile Petroleum Hydrocarbons
FP = Free Product
NA = Not Analyzed
NC2LGWQS Standard (µg/l)
WSW-22
EPA Drinking Water Standard (µg/l)
GCL (µg/l)
WSW-14
WSW-15
WSW-12
WSW-20
APPENDIX
LABORATORY DATA AND CHAIN-OF-CUSTODY DOCUMENTATION