WS-5532_19272_CA_RMR_20141110

An Equal Opportunity Employer

November 10, 2014

Mr. Waddell Watters
Winston-Salem Regional Office
Division of Waste Management
Department of Environment and Natural Resources
585 Waughtown Street
Winston-Salem, North Carolina 27107

Subject: ACTIVE REMEDIATION AND FREE PRODUCT RECOVERY REPORT
WILCO STATION #175
653 EAST WEBB AVENUE
BURLINGTON, NORTH CAROLINA
FACILITY ID#: 0-004038
INCIDENT NO.: 19272
MID-ATLANTIC JOB NO. 097R0583.79

Dear Mr. Watters:

Speedway LLC. is pleased to present this report of environmental services for the Speedway
#6958 (formerly Wilco #175) facility located at 653 East Webb Avenue in Burlington, North
Carolina. The attached report provides a summary of the annual groundwater sampling
activities, two quarterly Mobile Multi-Phase Extraction (MMPE) events and continued operation
of a downgradient vapor recovery system at the site.

This work was completed under Pre-Approval Task Authorizations 19272-77, 19272-78 and
19272-79. If you have any questions, please feel free to contact me at 937-863-7642 or Chuck
Hoffman at [phone].

Sincerely,

SPEEDWAY LLC

Keith A. Hughes
Advanced Environmental Representative

Speedway LLC

Speedway Office
P.O. Box 1500
Springfield, OH 45501

ACTIVE REMEDIATION AND FREE
PRODUCT RECOVERY REPORT
WILCO STATION #175 (SPEEDWAY #6958)
653 WEBB AVENUE
BURLINGTON, NORTH CAROLINA
INCIDENT NO.: 19272

Prepared For:

Speedway LLC
500 Speedway Drive
Enon, Ohio 45323
937-863-7642

Prepared By:

Mid-Atlantic Associates, Inc.
409 Rogers View Court
Raleigh, North Carolina 27610
Mid-Atlantic Job No. 000R0583.79

November 10, 2014

TABLE OF CONTENTS

1.0 INTRODUCTION ..................................................................................................... 1

2.0 POTENTIAL RECEPTORS ..................................................................................... 2

3.0 FIELD ACTIVITIES ................................................................................................. 3
3.1 Mobile Multi-Phase Extraction Events ............................................................. 3
3.2 Liquid Level Measurements ............................................................................ 4
3.3 Monitoring Well Sample Collection ................................................................. 4
3.4 Vapor Recovery System Monitoring and Maintenance ................................... 4

4.0 DISCUSSION OF SAMPLING RESULTS .............................................................. 5

5.0 SUMMARY, CONCLUSIONS, AND RECOMMENDATIONS .................................. 6

DRAWINGS

Drawing 1.1 Topographic Site Map
Drawing 1.2 Site and Monitoring Well Location Map
Drawing 4.1 Estimated Isoconcentration Map - Benzene in Groundwater – April 2014
Drawing 4.2 Estimated Isoconcentration Map – Methyl-Tert-Butyl Ether (MTBE) in
Groundwater – April 2014
Drawing 4.3 Estimated Water Table Contour Map – April 28-29, 2014

TABLES

Table 3.1 Summary of Historical Free Product Recovery Events
Table 3.2 Historical Free Product Thickness Data
Table 3.3 Monitoring Well Construction Data
Table 4.1 Summary of Historical Groundwater Quality Data for Selected Compounds
Table 4.2 Summary of Historical Groundwater Elevation Data

APPENDICES

Appendix A Selected Historical Site Information
Appendix B Monitoring Well Construction Records – MW-19, MW-23 and MW-30
Appendix C Advanced Environmental’s “Mobile Multiphase Extraction Reports”
Appendix D Mid-Atlantic Field Procedures
Appendix E Laboratory Analytical Report and Chain-of-Custody Record for
Groundwater Samples

1.0 INTRODUCTION

The subject site is the Wilco #175 gasoline and convenience store located at 653 East
Webb Avenue in Burlington, North Carolina (Drawings 1.1 and 1.2). A release from a
gasoline underground storage tank (UST) system was reported on November 6, 1997.
WILCOHESS, LLC (WILCOHESS) was the owner/operators of the UST system at that
time. The site was acquired by Speedway LLC on October 1, 2014 and is currently in
use as a convenience store and retail petroleum dispensing facility. Speedway refers to
this location as Store #6958. The layout of the facility is shown on Drawing 1.2

The petroleum release was previously under remediation using a soil vapor extraction
(SVE) and vapor-enhanced groundwater recovery and treatment system, which was
permanently shut down in December 2004 under Session Law 2004-124. Groundwater
monitoring was not conducted following shutdown of the treatment system, but the
North Carolina Department of Environment and Natural Resources (NCDENR)
requested continued operation of a vapor recovery system at the downgradient
Willowbrook Hosiery facility. A Notice of Regulatory Requirements (NORR) dated
February 29, 2008 directed the renewal of assessment and remediation activities.

WILCOHESS decided to perform a renovation of the gasoline station at the subject site in
2005. The renovation included removal of the UST system and replacement with a new
system, as well as razing of site buildings and construction of a new building. The UST
system was closed by removal, including the removal of associated dispensers and
underground product lines. Remedial and monitoring wells were also abandoned and the
SVE system was removed for site renovation purposes. Documentation for the
abandonment of these wells was previously submitted to NCDENR.

Historically, there have been three off-site monitoring wells (MW-21, MW-23 and MW-
24) which have exhibited free product. The wells are located on the adjacent and
surrounding properties northwest of the subject site, hydraulically downgradient of the
source area of release. After free product was initially detected in the wells, passive
skimming devices (absorbent socks) were installed to recover the product. Manual free
product recovery activities were then conducted from February through December 2009
and, upon completion, a “Free Product Recovery Report” dated January 25, 2010 was
submitted to the UST Section. The report included the results of the free product recovery
activities and also provided an evaluation of more aggressive active free product recovery
methods. Based on this evaluation, three subsequent Mobile Multi-Phase Extraction
(MMPE) events were conducted at the site in June 2012, August 2012 and August 2013.

Based on historical free product recovery results and subsequent discussions with the
NCDENR, it was determined that additional MMPE events would be conducted at the
site on a quarterly basis. The quarterly MMPE events will be conducted over a period of
one year, at which time the results will be used to further evaluate the effectiveness of
MMPE as a remedial technology. This report documents the first two quarterly MMPE
events conducted at the site in April and July 2014, along with the results of the annual
groundwater sampling event (April 2014) and operation of the downgradient vapor

Active Remediation and Free Product Recovery Report November 10, 2014
Wilco Station #175 (Speedway #6958) Page 2
Burlington, North Carolina

recovery system during the O&M reporting period (January through June 2014).
Selected historical site information is provided in Appendix A.

2.0 POTENTIAL RECEPTORS

No receptor survey update was conducted during the recent monitoring event. No
changes in the receptors were noted during field activities. A summary of the CSA
receptor survey is presented below. Please refer to previous reports for additional
information.

Water-Supply Wells

• There were no water-supply wells identified within 1,500 feet of the site.

Public Water Supplies

• The City of Burlington's municipal water and sewer are available at the site as well as
to properties located within 1,500 feet of the subject site. The city obtains its water
from two surface water bodies, Lake MacIntosh and the Stoney Creek Reservoir.

Surface Water

• Based upon our review of the Burlington, North Carolina USGS topographic
quadrangle map (Drawing 1.1), the closest surface water bodies to the subject site
are an intermittent, unnamed tributary of Little Alamance Creek, located approximately
1,400 feet west of the site, and an intermittent, unnamed tributary of the Haw River
located approximately 1,000 feet east of the site.

Wellhead Protection Areas

• No Wellhead Protection Areas were discovered within 1,500 feet of the site.

Deep Aquifers in the Coastal Plain Physiographic Province

• The subject site is not located in the Coastal Plain physiographic region.

Subsurface Structures

• There are underground utility lines located in the vicinity of the former UST locations. It
is unknown if these lines may be acting as a preferential migration pathway for
contaminants. Typically, utilities are buried two to four feet in depth, and the depth to
groundwater at the site is greater than 10 feet below land surface (BLS).

• It appears that sanitary sewer pipes (and/or the trench in which they are situated)
located beneath East Davis Street may have intersected the water table in the past.
Active Remediation and Free Product Recovery Report November 10, 2014
Wilco Station #175 (Speedway #6958) Page 3
Burlington, North Carolina

Therefore, it is possible that migration of impacted groundwater could be influenced by
these utilities. The elevation (relative to the site benchmark) of the bottom of the sewer
pipe is approximately 80 feet.

• Free product and contaminated groundwater have historically been present in the
basement of the Willowbrook Hosiery building, located approximately 600 feet
downgradient of the Wilco 175 site. The free product has occasionally caused vapor
problems in the building. Other basements in this vicinity may also be subject to
vapor problems associated with free product and contaminated groundwater.

3.0 FIELD ACTIVITIES

3.1 Mobile Multi-Phase Extraction Events

The MMPE events were conducted at the site during the weeks of April 14 through 18,
2014 and July 14 through 18, 2014 (two of the four quarterly MMPE events to be
conducted at the site over a period of one year). Advanced Environmental Services,
Inc. (AES) provided the MMPE services. A summary of historical free product recovery
events conducted at the site is provided in Table 3.1.

Free Product Thicknesses

• Prior to each MMPE, wells MW-19, MW-21, MW-23, MW-24, MW-27 and MW-30
were gauged for gasoline free product thickness. The same wells were then gauged
approximately two to three weeks following conclusion of each MMPE event (on
5/9/14 and 8/1/14). The results of the MMPE gauging activities are summarized in
Table 3.1, with historical free product thickness data for wells MW-19, MW-21, MW-
23, MW-24, MW-27 and MW-30 provided in Table 3.2.

• Monitoring well MW-30 was installed in April 2010 for the purpose of conducting
MMPE events, since the property owner would not allow for hose connection to well
MW-21, which historically has contained free product. Well construction records for
monitoring wells MW-19, MW-24 and MW-30 (from which product was removed
during the MMPE event) are provided in Appendix B.

Recovered Free Product

• Results of the active free product recovery activities are documented in AES’
“Mobile Multi-Phase Extraction Reports” dated April 29, 2014 and July 22, 2014
(Appendix C). In total, approximately 12,902 gallons of product/water mix were
recovered during these activities, with an estimated 92.78 gallons of gasoline free
product removed as vapor. A historical summary of free product recovery events is
provided in Table 3.1.

• On-site or off-site effluent discharges: None
Active Remediation and Free Product Recovery Report November 10, 2014
Wilco Station #175 (Speedway #6958) Page 4
Burlington, North Carolina

• Disposition of recovered liquids: Zebra Environmental and Industrial Services, Inc.
facility (manifest included in reports provided in Appendix C)

Water Level Drawdown Measurements

During MMPE events, water levels were measured in selected site monitoring wells once
a day to evaluate the influence of each MMPE event in a lateral direction. The
measurements are provided on the MMPE Field Logs in the contractor’s reports in
Appendix C. Maximum draw-down is reported on the Event Summary page in each of
AES’ MMPE reports in Appendix C. These measurements indicate that lateral influence is
being extended to these wells. See Drawing 1.2 for the locations of the gauging wells
relative to the extraction wells.

3.2 Liquid Level Measurements

Mid-Atlantic personnel collected liquid levels from the wells on April 28 and 29, 2014
using an electronic water level indicator or oil/water interface probe. Liquid level
measurements were collected using the procedures described in Appendix D.
Monitoring well construction data is summarized in Table 3.3.

3.3 Monitoring Well Sample Collection

Mid-Atlantic personnel collected groundwater samples from the wells on April 28 and 29,
2014. Groundwater samples were collected from all monitoring wells (with the exception
of MW-19, which exhibited free product at the time of sampling) using the procedures
outlined in Appendix D. Monitoring well construction data is provided in Table 3.3.

Samples were shipped to Con-Test Analytical Laboratories, Inc. (Con-Test) in East
Longmeadow, Massachusetts for analysis. Samples were analyzed by methods shown
in the chain-of-custody record provided at the back of the laboratory’s report in
Appendix E.
.
3.4 Vapor Recovery System Monitoring and Maintenance

A vapor recovery (VR) system at the Willowbrook Hosiery facility operated throughout
the reporting period. The system consists of a vacuum blower connected to a series of
vapor extraction wells located adjacent to the Willowbrook Hosiery building. The system
is designed to prevent potential petroleum vapors from entering the building’s
basement. Maintenance of the VR system was conducted on an approximately twice-a-
month basis. Operation and maintenance logs are kept on file.

Inspection and replacement (when necessary) of free product absorbent pads in the
basement of the Willowbrook Hosiery facility was also conducted on an approximately
twice-a-month basis during the reporting period.

Active Remediation and Free Product Recovery Report November 10, 2014
Wilco Station #175 (Speedway #6958) Page 5
Burlington, North Carolina

4.0 DISCUSSION OF SAMPLING RESULTS

Summary of Analytical Results

The laboratory analytical report and chain-of-custody record for groundwater samples
collected during the April 2014 sampling event are provided in Appendix E. A summary of
historical groundwater sampling results for selected target compounds is also provided in
Table 4.1. Additional compounds (not included in the table) may have been detected in
the samples; please refer to the laboratory’s analytical report for complete results.

Groundwater samples collected from several site monitoring wells exhibited target
compound concentrations in excess of the North Carolina Groundwater Quality Standards
(NCGQS). The samples collected from wells MW-21, MW-24 and MW-27 also exhibited
benzene concentrations in excess of its Gross Contamination Level (GCL).

Description of Current Plume Size and Location

During the April 2014 annual sampling event, free product was detected at a measurable
thickness in one of the monitoring wells located hydraulically downgradient of the subject
site (MW-19). Free product has also historically been present in monitoring wells MW-23
and MW-24, but was not present during the recent sampling and gauging activities.
Based on these results, free product appears to be confined to a relatively small area,
and in a relatively thin layer, hydraulically downgradient of the site.

Isoconcentration maps for benzene and MTBE are provided as Drawings 4.1 and 4.2,
respectively. Compared with the results from the previous groundwater sampling events,
it appears the size and shape of the dissolved-phase groundwater contaminant plume
have remained relatively stable over time (historical isoconcentration maps are included in
Appendix A).

Future Remediation

Corrective action will be required at the site in the future to potentially reach groundwater
cleanup goals and ultimately move the incident towards closure. Due to the presence
free product, additional soil and/or groundwater treatment may need to be evaluated at
several areas hydraulically downgradient of the subject site. However, based on
previous discussions with adjacent property owners, installation of a SVE or other
dedicated remedial system would likely meet resistance. It is therefore unknown if this
is a viable option and, based on these discussions, MMPE continues to serve as an
alternative for free product recovery and groundwater remediation at this time. Two
additional quarterly MMPE events will be conducted in October 2014 and January 2015,
at which time the results will be used to further evaluate the efficacy of this technology.
Additionally, we are also evaluating the potential feasibility of a horizontal extraction
system, and negotiations are currently under way with off-site property owners in
support of this potential remedial technology.

Active Remediation and Free Product Recovery Report November 10, 2014
Wilco Station #175 (Speedway #6958) Page 6
Burlington, North Carolina

Additional Monitoring Information

• Proximity of Plume to Nearest Receptor

As discussed previously, free product and contaminated groundwater have been
intermittently present in the basement of the Willowbrook Hosiery building, located
approximately 600 feet downgradient of the subject site.

Based on the historical depth-to-water measurements at monitoring well MW-27
when compared to the typical basement depth (8 ft), it appears that there is the
potential for free product and/or vapors to enter basements located near free
product areas (MW-19, MW-21, MW-23, and MW-24, historically). The Bateman
residence is constructed with a basement, but previous evaluations have not
shown evidence of impact.

Additionally, it was determined during an investigation (results were contained in a
“CSA Addendum Report” dated May 18, 2004) that the sanitary sewer line located
beneath East Davis Street could potentially intercept impacted groundwater during
high water table periods. We have no historical evidence to suggest that vapors
are accumulating in the sewer system. Additionally, FID measurements of the
sewer air spaces collected during the April 2013 sampling event did not exhibit
elevated readings.

• Groundwater Flow Direction

Groundwater flow direction across the site is generally to the southwest with a
hydraulic gradient (MW-18 towards MW-26) of approximately 0.015 ft/ft. An
Estimated Water Table Contour Map is provided as Drawing 4.3. Historical and
current depth-to-water measurements and groundwater elevations for the site
monitoring wells are provided in Table 4.2. Hydraulic gradient was calculated
using the procedure discussed in Appendix D.

• Predictive Rate of Contaminant Transport

Unknown. It appears that a preferential migration pathway (e.g., a former stream
bed, fracture zone, dike, etc.) may exist between the Wilco 175 site and the
Willowbrook Hosiery site. This pathway may be allowing accelerated transport of
contaminants.

5.0 SUMMARY, CONCLUSIONS, AND RECOMMENDATIONS

The activities conducted during the reporting period are summarized as follows:

• A vapor recovery system is currently operating at the Willowbrook Hosiery property to
remove potential petroleum vapors prior to entering the building;
Active Remediation and Free Product Recovery Report November 10, 2014
Wilco Station #175 (Speedway #6958) Page 7
Burlington, North Carolina

• Two MMPE events were conducted using monitoring wells MW-19, MW-24 and MW-
30 as extraction points. A total of approximately 12,902 gallons of product/water mix
were recovered during these activities, with an estimated 92.78 gallons of gasoline
free product removed as vapor; and

• Groundwater samples were collected from site monitoring wells and analyzed using
EPA Method 602 to provide information regarding contaminant plume movement and
attenuation.

Based on the results, Mid-Atlantic concludes the following:

• It appears that the groundwater directly beneath the Wilco 175 property no longer
contains free product; however, a relatively thin layer of free product appears to
remain on the water table in an area hydraulically downgradient of the site. The
fluctuating thicknesses of free product over time could be attributed to the potential
presence of free product in sand lenses associated with the surrounding geologic
formations;

• The groundwater contaminant concentrations detected in April 2014 appear to be
similar to those of sampling events conducted over the previous several years.
Corrective action will be required at the site in the future to potentially reach
groundwater cleanup goals and ultimately move the incident towards closure; and

• The effectiveness of MMPE in removing free product as vapor suggests that a
dedicated vapor extraction system may be an effective means of removing the
remaining free product from the water table. However, property owners have shown
reluctance in the past to allow access to install a dedicated system and, therefore, it is
unclear if this could be accomplished in the future.

Based on the conclusions, Mid-Atlantic recommends the following:

• Performance of the final two quarterly MMPE events at the site in October 2014 and
January 2015 (Note: the current scope of work includes performance of four MMPE
events over a period of one year);

• Evaluation of the need for additional soil and/or groundwater treatment in the areas
between the Wilco 175 facility and the Willowbrook Hosiery. The evaluation should
consider air sparging, dual-phase extraction, SVE, continued MMPE, or other
technology to address free product and potentially impacted soils in the smear zone.
At minimum, groundwater contaminant concentrations will need to be reduced to
below the GCLs for the incident to potentially be eligible for closure;

• Periodic monitoring of downgradient residential structures and sewers for petroleum
vapors (using an FID or similar device);

Active Remediation and Free Product Recovery Report November 10, 2014
Wilco Station #175 (Speedway #6958) Page 8
Burlington, North Carolina

• Continued operation and maintenance of the VR system at the Willowbrook Hosiery
facility; and

• Continued groundwater monitoring of the site on an annual basis.

DRAWINGS

TABLES
FREE PRODUCT
REMOVAL METHOD DATE
TOTAL FLUID
RECOVERED
(GALLONS)
FREE PRODUCT
RECOVERED
(GALLONS)
FREE PRODUCT
OFF-GAS
EMISSIONS
(GALLONS)
TOTAL FREE
PRODUCT
RECOVERED
(GALLONS)
Absorbent Socks 2/24/2009 --0.625 --0.625
Absorbent Socks 3/3/2009 --0.28 --0.28
Absorbent Socks 3/10/2009 --0.28 --0.28
Absorbent Socks 3/17/2009 --0.34 --0.34
Absorbent Socks 3/27/2009 --0.28 --0.28
Absorbent Socks 4/7/2009 --0.38 --0.38
Absorbent Socks 4/17/2009 --0.22 --0.22
Absorbent Socks 4/21/2009 --0.25 --0.25
Absorbent Socks 4/28/2009 --0.0625 --0.0625
Absorbent Socks 5/12/2009 --0.0625 --0.0625
Absorbent Socks 5/22/2009 --0.09 --0.09
Absorbent Socks 6/2/2009 --0.0625 --0.0625
Absorbent Socks 6/10/2009 --0.0625 --0.0625
Absorbent Socks 6/19/2009 --0.05 --0.05
Absorbent Socks 6/30/2009 --0.0625 --0.0625
Absorbent Socks 7/7/2009 --0.05 --0.05
Absorbent Socks 7/21/2009 --0.08 --0.08
Absorbent Socks 7/28/2009 --0.05 --0.05
Absorbent Socks 8/6/2009 --0.08 --0.08
Absorbent Socks 8/18/2009 --0.08 --0.08
Absorbent Socks 8/26/2009 --0.0625 --0.0625
Absorbent Socks 9/8/2009 --0.125 --0.125
Absorbent Socks 9/15/2009 --0.14 --0.14
Absorbent Socks 9/25/2009 --0.08 --0.08
Absorbent Socks 10/2/2009 --0.09 --0.09
Absorbent Socks 10/12/2009 --0.09 --0.09
Absorbent Socks 10/20/2009 --0.09 --0.09
Absorbent Socks 10/26/2009 --0.22 --0.22
Absorbent Socks 11/2/2009 --0.11 --0.11
Absorbent Socks 11/11/2009 --0.22 --0.22
Absorbent Socks 11/17/2009 --0.19 --0.19
Absorbent Socks 11/24/2009 --0.11 --0.11
Absorbent Socks 12/1/2009 --0.09 --0.09
Absorbent Socks 12/8/2009 --0.05 --0.05
Absorbent Socks 12/22/2009 --0.0625 --0.0625
Absorbent Socks 12/1/2009 --0.05 --0.05
MMPE No. 1 6/14-18/2012 7,528 --132.82 132.82
MMPE No. 2 8/6-10/2012 5,294 --217.27 217.27
MMPE No. 3 8/26-30/2013 7,232 --96.33 96.33
MMPE No. 4 4/14-18/2014 9,911 --52.54 52.54
MMPE No. 5 7/14-18/2014 2,991 --40.24 40.24
32,956 5.23 539.20 544.43TOTAL:
TABLE 3.1
SUMMARY OF HISTORICAL FREE PRODUCT RECOVERY EVENTS
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
MID-ATLANTIC JOB 097R0583.79
Page 1 of 1
WELL NUMBER DATE (ft)(ft)
FP THICKNESS
(ft)(ft)
CORRECTED
DTW (ft)(ft)
MW-19 3/15/2000 90.10 -- 0.00 11.11 --78.99
MW-19 12/10/2001 90.10 --0.00 15.06 --75.04
MW-19 5/14/2002 90.10 --0.00 13.76 --76.34
MW-19 8/29/2002 90.10 --0.00 16.85 --73.25
MW-19 11/11/2002 90.10 --0.00 12.98 --77.12
MW-19 2/26/2003 90.10 --0.00 10.84 --79.26
MW-19 5/15/2003 90.10 --0.00 10.17 --79.93
MW-19 8/14/2003 90.10 --0.00 10.19 --79.91
MW-19 11/5/2003 90.10 --0.00 10.99 --79.11
MW-19 5/5/2004 90.10 --0.00 11.82 --78.28
MW-19 11/18/2004 90.10 --0.00 11.77 --78.33
MW-19 4/29/2008 90.10 --0.00 11.31 --78.79
MW-19 4/21/2009 90.10 --0.00 10.31 --79.79
MW-19 4/27/2010 90.10 --0.00 10.61 --79.49
MW-19 6/14/2010 90.10 --0.00 11.41 --78.69
MW-19 4/18/2011 90.10 --0.00 11.34 --78.76
MW-19 4/10/2012 90.10 --0.00 11.57 --78.53
MW-19 8/6/2012 90.10 --0.00 12.83 --77.27
MW-19 8/29/2012 90.10 --0.00 12.96 --77.14
MW-19 8/26/2013 90.10 --0.00 10.25 --79.85
MW-19 9/18/2013 90.10 11.35 0.05 11.40 11.36 78.74
MW-19 4/14/2014 90.10 --0.00 9.58 --80.52
MW-19 4/28/2014 90.10 9.33 0.28 9.61 9.41 80.69
MW-19 5/9/2014 90.10 9.80 0.41 10.21 9.91 80.19
MW-19 7/14/2014 90.10 12.27 0.51 12.78 12.41 77.69
MW-19 8/1/2014 90.10 --0.00 12.78 --77.32
0
MW-21 4/4/2003 89.31 --0.00 9.21 --80.10
MW-21 5/15/2003 89.31 --0.00 9.82 --79.49
MW-21 8/14/2003 89.31 --0.00 9.36 --79.95
MW-21 11/5/2003 89.31 --0.00 10.39 --78.92
MW-21 5/5/2004 89.31 --0.00 11.10 --78.21
MW-21 11/18/2004 89.31 --0.00 11.02 --78.29
MW-21 4/29/2008 89.31 10.71 0.08 10.79 10.73 78.58
MW-21 4/21/2009 89.31
MW-21 4/27/2010 89.31 10.34 0.02 10.36 10.35 78.96
MW-21 6/14/2010 89.31
MW-21 4/18/2011 89.31 10.34 0.47 10.81 10.47 78.84
MW-21 4/10/2012 89.31 10.99 0.07 11.06 11.01 78.30
MW-21 8/6/2012 89.31 12.26 0.50 12.51 12.15 77.17
MW-21 8/29/2012 89.31 12.44 0.01 12.45 12.44 76.87
MW-21 8/26/2013 89.31 --0.00 9.81 --79.50
MW-21 9/18/2013 89.31 --0.00 10.91 --78.40
MW-21 4/14/2014 89.31 --0.00 9.11 --80.20
MW-21 4/29/2014 89.31 0.00 9.03 --80.28
MW-21 5/9/2014 89.31 --0.00 9.47 --79.84
MW-21 7/14/2014 89.31 --0.00 11.24 --78.07
MW-21 8/1/2014 89.31 --0.00 12.20 --77.11
0
MW-23 4/4/2003 85.97 --0.00 6.04 --79.93
MW-23 5/15/2003 85.97 --0.00 7.06 --78.91
MW-23 8/14/2003 85.97 --0.00 6.05 --79.92
MW-23 11/5/2003 85.97 --0.00 7.86 --78.11
MW-23 5/5/2004 85.97 --0.00 8.24 --77.73
MW-23 11/18/2004 85.97 --0.00 8.28 --77.69
MW-23 4/29/2008 85.97 8.30 0.18 8.48 8.35 77.62
MW-23 4/21/2009 85.97
MW-23 4/27/2010 85.97 --0.00 7.49 --78.48
MW-23 6/14/2010 85.97 --0.00 8.40 --77.57
MW-23 4/18/2011 85.97 --0.00 8.31 --77.66
MW-23 4/10/2012 85.97 8.14 0.65 8.79 8.32 77.65
MW-23 8/6/2012 85.97 9.79 0.70 10.49 9.98 75.99
MW-23 8/29/2012 85.97 --0.00 10.08 75.89
MW-23 8/26/2013 85.97 --0.00 7.73 78.24
MW-23 9/18/2013 85.97 8.56 0.02 8.58 8.57 77.40
MW-23 4/14/2014 85.97 --0.00 7.40 --78.57
MW-23 4/28/2014 85.97 --0.00 6.21 --79.76
MW-23 5/9/2014 85.97 --0.00 6.48 --79.49
MW-23 7/14/2014 85.97 --0.00 9.26 --76.71
MW-23 8/1/2014 85.97 --0.00 9.94 --76.03
TABLE 3.2
HISTORICAL FREE PRODUCT THICKNESS DATA
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
Free Product Absorbent Socks Currently in Well
Equipment malfunction - no reading available
Free Product Absorbent Socks Currently in Well
Page 1 of 2
WELL NUMBER DATE (ft)(ft)
FP THICKNESS
(ft)(ft)
CORRECTED
DTW (ft)(ft)
TABLE 3.2
HISTORICAL FREE PRODUCT THICKNESS DATA
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
MW-24 4/4/2003 87.52 --0.00 7.63 --79.89
MW-24 5/15/2003 87.52 --0.00 8.24 --79.28
MW-24 8/14/2003 87.52 --0.00 7.49 --80.03
MW-24 11/5/2003 87.52 --0.00 8.86 --78.66
MW-24 5/5/2004 87.52 --0.00 9.47 --78.05
MW-24 11/18/2004 87.52 --0.00 9.37 --78.15
MW-24 4/29/2008 87.52 9.10 0.19 9.29 9.15 78.37
MW-24 4/21/2009 87.52
MW-24 4/27/2010 87.52 --0.00 8.64 --78.88
MW-24 6/14/2010 87.52 --0.00 9.30 --78.22
MW-24 4/18/2011 87.52 --0.00 9.20 --78.32
MW-24 4/10/2012 87.52 9.33 0.36 9.69 9.43 78.09
MW-24 8/6/2012 87.52 10.54 0.50 11.04 10.68 76.85
MW-24 8/29/2012 87.52 10.79 0.03 10.82 10.80 76.72
MW-24 8/26/2013 87.52 --0.00 8.22 --79.30
MW-24 9/18/2013 87.52 --0.00 9.29 --78.23
MW-24 4/14/2014 87.52 --0.00 7.58 --79.94
MW-24 4/28/2014 87.52 --0.00 7.41 --80.11
MW-24 5/9/2014 87.52 --0.00 8.90 --78.62
MW-24 7/14/2014 87.52 --0.00 10.24 --77.28
MW-24 8/1/2014 87.52 --0.00 10.68 --76.84
MW-27 5/5/2004 87.88 --0.00 9.83 --78.05
MW-27 11/18/2004 87.88 --0.00 9.75 --78.13
MW-27 4/30/2008 87.88 --0.00 9.47 --78.41
MW-27 4/22/2009 87.88 --0.00 8.63 --79.25
MW-27 4/27/2010 87.88 --0.00 8.94 --78.94
MW-27 4/18/2011 87.88 --0.00 9.56 --78.32
MW-27 4/10/2012 87.89 --0.00 9.81 --78.08
MW-27 8/6/2012 87.89 --0.00 11.06 --76.83
MW-27 8/29/2012 87.89 --0.00 11.21 --76.68
MW-27 8/26/2013 87.89 --0.00 8.59 --79.30
MW-27 9/18/2013 87.89
MW-27 4/14/2014 87.89 --0.00 7.88 --80.01
MW-27 4/29/2014 87.89 --0.00 7.82 --80.07
MW-27 5/9/2014 87.89
MW-27 7/14/2014 87.89 --0.00 10.60 --77.29
MW-27 8/1/2014 87.89 --0.00 11.03 --76.86
MW-30 4/27/2010 90.23 --0.00 11.14 --79.09
MW-30 6/14/2010 90.23 --0.00 11.80 --78.43
MW-30 4/18/2011 90.23 --0.00 11.71 --78.52
MW-30 8/6/2012 90.23 --0.00 13.18 --77.05
MW-30 8/29/2012 90.23 --0.00 13.29 --76.94
MW-30 8/26/2013 90.23 --0.00 10.72 --79.51
MW-30 9/18/2013 90.23 --0.00 11.78 --78.45
MW-30 4/29/2014 90.23 --0.00 9.94 --80.29
MW-30 4/14/2014 90.23 --0.00 10.00 --80.23
MW-30 5/9/2014 90.23 --0.00 10.38 --79.85
MW-30 7/14/2014 90.23 --0.00 12.71 --77.52
MW-30 8/1/2014 90.23 --0.00 13.11 --77.12
Notes:
Shaded cells indicate that the water level has been corrected for the presence of free product (see next page)
DTW - Depth-to-Water in feet
SWLE - Static Water Elevation in feet
Free Product Absorbent Socks Currently in Well
Restricted access to well (could not gauge)
Restricted access to well (could not gauge)
All elevations based on relative elevation to SW concrete pedestal of the Wilco sign - Assumed datum 100.00 feet
Measuring point is top of well (TOC) casing unless otherwise noted.
DTP - Depth-to-Free Product in feet
FP - Free Product in feet
Page 2 of 2
WATER LEVEL CORRECTION CALCULATION FOR WELL WITH FREE PRODUCT
The static water level is corrected for the weight of the overlying free product using the following calculation:
GASOLINE AND DIESEL
Corrected Depth to Water (CDTW) = DTW - (Gp X APT)
where:
DTW = depth to water (as measured)
Gp = specific gravity of gasoline = 0.73
APT = apparent free product thickness (as measured)
As an example, for MW-19 on 9/18/13, the following calculation is made for gasoline free product:
CDTW = 11.40 - (0.73 X 0.05 ft)
= 11.36
Static water level therefore equals 100.00 - 24.28 = 75.72
This formula is embedded in the Groundwater Elevation Data table when appropriate
TABLE 3.2 ADDENDUM
MW-1*4 11/10/1997 28 8 – 28
MW-2*4 12/11/1997 18 8 – 18
MW-3*4 12/11/1997 18 8 – 18
MW-4*4 12/11/1997 20 10 – 20
MW-5*4 12/11/1997 20 10 – 20
MW-6*4 12/11/1997 21 11 – 21
MW-7*4 1/9/1998 20 10 – 20
MW-8*4 1/9/1998 23.5 13.5 – 23.5
MW-9*2 4/29/1998 18 8 – 18
MW-10*2 4/29/1998 17 7 – 17
MW-11D*2 4/29&30/98 60 55 - 60
MW-12*2 4/29/1998 18 8 – 18
MW-13*2 4/29/1998 18 8 – 18
MW-14*2 4/29/1998 18 8 – 18
MW-15 2 7/27/1998 18 8 – 18
MW-16 2 7/27/1998 18 8 – 18
MW-17*2 7/27/1998 18 8 – 18
MW-18 2 8/21/1998 18 8 – 18
MW-19 2 3/9/2000 18 8 – 18
MW-20 2 3/31/2003 19 4 – 19
MW-21 2 4/1/2003 21 6 – 21
MW-22 2 4/1/2003 19 4 – 19
MW-23 2 4/1/2003 19 5 – 20
MW-24 2 4/2/2003 20 5 – 20
MW-25 2 3/6/2004 13 3 - 13
MW-26 2 3/6/2004 12.5 2.5 - 12.5
MW-27 2 4/2/2004 14 4 - 14
MW-28 2 4/2/2004 20 5 – 20
MW-29 2 4/16/2009 22 7 - 22
MW-30 2 4/27/2010 20 5 – 20
VE-1*4 3/23/1999 20 5 – 20
VE-2*4 3/23/1999 20 5 – 20
VE-3 4 3/23/1999 20 5 – 20
VE-4*4 3/23/1999 20 5 – 20
VE-5*4 3/24/1999 20 5 – 20
VE-6*4 3/24/1999 20 5 – 20
VE-7*4 3/24/1999 20 5 – 20
MWWB-1 2 12/18/2001 18 3 – 18
MWWB-2 2 12/18/2001 20 5 – 20
MWWB-3 2 12/18/2001 20 5 – 20
MWWB-4 2 12/18/2001 20 5 – 20
MW-2R 2 4/15/2008 22 7 – 22
MW-6R 2 4/15/2008 22 7 – 22
MW-10R 2 4/15/2008 22 7 – 22
MW-13R 2 4/15/2008 22 7 – 22
* Removal during site redevelopment activities in 2005
BLS - Below Land Surface
TABLE 3.3
MONITORING WELL CONSTRUCTION DATA
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
MID-ATLANTIC JOB NO. 097R0583.79
WELL NUMBER DIAMETER
(INCHES)
CONSTRUCTION
DATE BLS)
SCREENED INTERVAL
(FEET BLS)
5,000 260,000 84,500 85,500 NL 20,000 70,000 50 400 NL NL NL 15,000
1 600 600 500 NL 20 70 0.02 0.4 420 4,200 210 15
4/2/98 FP FP FP FP FP FP FP FP FP FP FP FP FP
5/5/98 FP FP FP FP FP FP FP FP FP FP FP FP FP
7/29/98 FP FP FP FP FP FP FP FP FP FP FP FP FP
3/15/00 FP FP FP FP FP FP FP FP FP FP FP FP FP
12/10/01 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/14/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
8/29/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/11/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
2/26/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/15/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
8/14/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/5/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/5/04 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/18/04 NS NS NS NS NS NS NS NS NS NS NS NS NS
4/2/98 ND ND ND ND ND ND ND ND ND NR NR NR ND
5/5/98 NS NS NS NS NS NS NS NS NS NS NS NS NS
7/29/98 ND ND ND ND ND ND ND NR ND ND ND ND ND
3/15/00 ND ND ND ND ND ND ND NR NR NR NR NR NR
12/11/01 ND ND ND ND ND ND ND ND ND ND ND ND ND
5/14/02 ND ND ND ND ND ND ND ND ND ND ND ND ND
8/29/02 ND ND ND ND ND ND ND ND ND ND ND ND 14.6
11/11/02 ND ND ND ND ND ND ND ND ND ND ND ND ND
2/26/03 ND ND ND ND ND ND ND ND ND ND ND ND 5.03
5/15/03 ND ND ND ND ND ND ND ND ND ND ND ND ND
8/14/03 ND ND ND ND ND ND ND NR NR NR NR NR NR
11/5/03 ND ND ND ND ND ND ND NR NR NR NR NR NR
5/5/04 ND ND ND ND ND ND ND NR NR NR NR NR NR
11/18/04 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/30/08 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/21/09 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/27/10 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/18/11 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/10/12 ND ND ND ND ND 0.483J ND NR NR NR NR NR NR
4/16/13 ND ND ND ND ND 2.5J ND NR NR NR NR NR NR
4/28/14 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/2/98 6.3 ND ND ND 6.3 37 16 ND 22 NR NR NR ND
5/5/98 NS NS NS NS NS NS NS NS NS NS NS NS NS
7/29/98 20 2.5 4.5 5.1 32.1 52 25 NR 26 200 202 61 ND
3/15/00 160 31 57 89 337 59 36 NR NR NR NR NR NR
12/11/01 270 8 46 37 361 220 83 ND 28 1,200 190 ND 24.4
5/14/02 4 ND 3 ND 7 2 1 ND ND 120 ND ND 31.9
8/29/02 15 1 15 8 39 17 12 ND 2 ND ND ND 587
11/11/02 1 1 2 ND 4 10 4 ND 3 ND ND ND 12.2
2/26/03 1.3 320 5.5 8.9 335.7 9.4 10 ND 5.7 300 ND ND 17
5/15/03 ND 870 ND ND 870 ND ND ND ND 1,100 450 ND 134
8/14/03 ND 51 ND ND 51 ND ND NR NR NR NR NR NR
11/5/03 0.25J 6.7 0.68J ND 7.63 16 8 NR NR NR NR NR NR
5/5/04 0.487J ND ND ND 0.487J 35.9 22.3 NR NR NR NR NR NR
11/18/04 ND 1,090 ND ND 1,090 62J ND NR NR NR NR NR NR
MW-1
0
MW-2
MW-2R
MW-3
Well destroyed during construction activities
TABLE 4.1
SUMMARY OF HISTORICAL GROUNDWATER QUALITY DATA FOR SELECTED COMPOUNDS
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
EDB (ug/L)Ethylbenzene
(ug/L)
Total Xylenes
(ug/L)
Well
Number
Sample
Date
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
C5-C8 Aliph
(ug/L)
C9-C12 Aliph
(ug/L)
C9-C10 Arom
(ug/L)
GCL
Benzene (ug/L)1,2-DCA (ug/L)Total BTEX
(ug/L)MTBE (ug/L)(ug/L)DIPE (ug/L)
NCGQS
Toluene (ug/L)
Page 1 of 10
5,000 260,000 84,500 85,500 NL 20,000 70,000 50 400 NL NL NL 15,000
1 600 600 500 NL 20 70 0.02 0.4 420 4,200 210 15
TABLE 4.1
SUMMARY OF HISTORICAL GROUNDWATER QUALITY DATA FOR SELECTED COMPOUNDS
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
EDB (ug/L)Ethylbenzene
(ug/L)
Total Xylenes
(ug/L)
Well
Number
Sample
Date
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
C5-C8 Aliph
(ug/L)
C9-C12 Aliph
(ug/L)
C9-C10 Arom
(ug/L)
GCL
Benzene (ug/L)1,2-DCA (ug/L)Total BTEX
(ug/L)MTBE (ug/L)(ug/L)DIPE (ug/L)
NCGQS
Toluene (ug/L)
4/30/08 8.27 1.32 9.29 39.45 58.33 ND ND NR NR NR NR NR NR
4/21/09 19.9 4.86 24.3 77.7 126.76 ND ND NR NR NR NR NR NR
4/27/10 24.4 3.58 53.3 108.5 189.78 32.9 5.58 NR NR NR NR NR NR
4/18/11
4/10/12 47.6 69.3 616 2,740 3,472.9 1,240 53.0 NR NR NR NR NR NR
4/16/13 65 59 890 3,700 4,714.0 2,200 25J NR NR NR NR NR NR
4/28/14 49 85 1,700 6,800 8,634.0 280 L ND NR NR NR NR NR NR
4/2/98 FP FP FP FP FP FP FP FP FP FP FP FP FP
5/5/98 FP FP FP FP FP FP FP FP FP FP FP FP FP
7/29/98 FP FP FP FP FP FP FP FP FP FP FP FP FP
3/15/00 FP FP FP FP FP FP FP FP FP FP FP FP FP
12/10/01 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/14/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
8/29/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/11/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
2/26/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/15/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
8/14/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/5/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/5/04 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/18/04 NS NS NS NS NS NS NS NS NS NS NS NS NS
4/2/98 2,100 1,400 330 2,000 5,830 900 380 0.8 15 NR NR NR ND
5/5/98 NS NS NS NS NS NS NS NS NS NS NS NS NS
7/29/98 2,200 530 150 820 3,700 790 260 NR ND 9,600 9,050 2,880 5.3
3/15/00 2,000 1,300 240 1,720 5,260 690 93 NR NR NR NR NR NR
12/10/01 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/14/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
8/29/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/11/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
2/26/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/15/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
8/14/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/5/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/5/04 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/18/04 NS NS NS NS NS NS NS NS NS NS NS NS NS
4/2/98 FP FP FP FP FP FP FP FP FP FP FP FP FP
5/5/98 FP FP FP FP FP FP FP FP FP FP FP FP FP
7/29/98 FP FP FP FP FP FP FP FP FP FP FP FP FP
3/15/00 FP FP FP FP FP FP FP FP FP FP FP FP FP
12/10/01 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/14/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
8/29/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/11/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
2/26/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/15/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
8/14/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/5/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/5/04 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/18/04 NS NS NS NS NS NS NS NS NS NS NS NS NS
VE-3
MW-4
Well destroyed during construction activities
MW-5
Well destroyed during construction activities
MW-6
Well destroyed during construction activities
0
0
Well could not be located - no sample collected
Page 2 of 10
5,000 260,000 84,500 85,500 NL 20,000 70,000 50 400 NL NL NL 15,000
1 600 600 500 NL 20 70 0.02 0.4 420 4,200 210 15
TABLE 4.1
SUMMARY OF HISTORICAL GROUNDWATER QUALITY DATA FOR SELECTED COMPOUNDS
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
EDB (ug/L)Ethylbenzene
(ug/L)
Total Xylenes
(ug/L)
Well
Number
Sample
Date
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
C5-C8 Aliph
(ug/L)
C9-C12 Aliph
(ug/L)
C9-C10 Arom
(ug/L)
GCL
Benzene (ug/L)1,2-DCA (ug/L)Total BTEX
(ug/L)MTBE (ug/L)(ug/L)DIPE (ug/L)
NCGQS
Toluene (ug/L)
4/30/08 6,600 ND 848 J 9,380 J 16,828 50,000 650 J NR NR NR NR NR NR
4/21/09 6,440 ND ND 5,170 J 11,610 42,900 ND NR NR NR NR NR NR
4/27/10 5,540 ND 1330 7640J 15,136 29,800 ND NR NR NR NR NR NR
4/18/11 5,210 ND 424 3599J 9,233 16,700 360J NR NR NR NR NR NR
4/10/12 3,450 ND 390 3,765J 7,605 10,200 157 J NR NR NR NR NR NR
4/16/13 1,800 66 540 4,700 7,106 7,700 56 J NR NR NR NR NR NR
4/28/14 620 ND 750 6,000 7,370 2,300 ND NR NR NR NR NR NR
4/2/98 3,700 13,000 840 4,300 21,840 18,000 270 33 64 NR NR NR ND
5/5/98 NS NS NS NS NS NS NS NS NS NS NS NS NS
7/29/98 14,000 19,000 1,900 11,000 45,900 94,000 1,300 NR ND 109,000 26,300 8,810 ND
3/15/00 FP FP FP FP FP FP FP FP FP FP FP FP FP
12/10/01 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/14/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
8/29/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/11/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
2/26/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/15/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
8/14/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/5/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/5/04 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/18/04 NS NS NS NS NS NS NS NS NS NS NS NS NS
4/2/98 FP FP FP FP FP FP FP FP FP FP FP FP FP
5/5/98 FP FP FP FP FP FP FP FP FP FP FP FP FP
7/29/98 FP FP FP FP FP FP FP FP FP FP FP FP FP
3/15/00 FP FP FP FP FP FP FP FP FP FP FP FP FP
12/10/01 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/14/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
8/29/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/11/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
2/26/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/15/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
8/14/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/5/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/5/04 NS NS NS NS NS NS NS NS NS NS NS NS NS
11/18/04 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/5/98 FP FP FP FP FP FP FP FP FP FP FP FP FP
7/29/98 FP FP FP FP FP FP FP FP FP FP FP FP FP
3/15/00 NS NS NS NS NS NS NS NS NS NS NS NS NS
12/10/01 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/14/02 FP FP FP FP FP FP FP FP FP FP FP FP FP
8/29/02 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY
11/11/02 12,000 22,000 2,200 15,400 51,600 5,000 ND ND 180 41,000 29,000 ND 25.1
2/26/03 690 4,400 1,300 13,300 19,690 2,000 46 ND 15 8,800 19,000 4,900 37.8
5/15/03 1,100 640 230 2,970 4,940 13,000 180 J 2.5 72 9,100 4,900 ND 5.57
8/14/03 790 430 140 3,700 5,060 3,300 69 NR NR NR NR NR NR
11/5/03 5,900 J 220 J 200 3,390 9,710 38,000 460J NR NR NR NR NR NR
5/5/04 4,000 J 262 596 3,662 8,520 23,200 465J NR NR NR NR NR NR
11/18/04 2,360 ND J 314 1,690 4,364 20,300 321J NR NR NR NR NR NR
MW-9
Well destroyed during construction activities
0
0
MW-6R
MW-7
Well destroyed during construction activities
MW-8
Well destroyed during construction activities
Page 3 of 10
5,000 260,000 84,500 85,500 NL 20,000 70,000 50 400 NL NL NL 15,000
1 600 600 500 NL 20 70 0.02 0.4 420 4,200 210 15
TABLE 4.1
SUMMARY OF HISTORICAL GROUNDWATER QUALITY DATA FOR SELECTED COMPOUNDS
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
EDB (ug/L)Ethylbenzene
(ug/L)
Total Xylenes
(ug/L)
Well
Number
Sample
Date
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
C5-C8 Aliph
(ug/L)
C9-C12 Aliph
(ug/L)
C9-C10 Arom
(ug/L)
GCL
Benzene (ug/L)1,2-DCA (ug/L)Total BTEX
(ug/L)MTBE (ug/L)(ug/L)DIPE (ug/L)
NCGQS
Toluene (ug/L)
5/5/98 ND ND ND ND ND 7.3 ND ND ND NR NR NR ND
7/29/98 ND ND ND ND ND 2.7 ND NR ND ND ND ND ND
3/15/00 ND ND ND ND ND ND ND NR NR NR NR NR NR
12/11/01 1 4 2 12 19 20 4 ND ND ND ND ND ND
5/14/02 ND ND ND ND ND 270 46 ND 5 160 ND ND ND
8/29/02 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY
11/11/02 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY
2/26/03 13 160 400 620 1,193 ND ND ND ND 2,100 1,500 300 ND
5/16/03 10 33 250 204 497 ND ND ND ND 1,600 800 ND ND
8/15/03 5.1 10 87 36 138.1 ND ND NR NR NR NR NR NR
11/5/03 ND ND 5.6 ND 5.6 240 26 NR NR NR NR NR NR
5/5/04 J 0.936 ND ND J 1.06 J 1.996 236 34.9 NR NR NR NR NR NR
11/18/04 11.2 ND ND ND 11.2 393 27.9 NR NR NR NR NR NR
4/30/08 ND ND 0.449 J ND 0.449 16.5 0.801 J NR NR NR NR NR NR
4/21/09 ND ND 0.372 J 0.662 J 1.034 12.4 ND NR NR NR NR NR NR
4/27/10 ND ND ND ND ND 23.9 ND NR NR NR NR NR NR
4/18/11 ND ND ND ND ND 14.4 ND NR NR NR NR NR NR
4/10/12 ND ND ND ND ND 18.4 ND NR NR NR NR NR NR
4/16/13 ND ND ND ND ND 20 ND NR NR NR NR NR NR
4/28/14 ND ND ND ND ND 19 ND NR NR NR NR NR NR
5/5/98 8.2 20 2.7 14 44.9 ND ND 0.29 ND NR NR NR 11.0
7/29/98 120 260 17 94 491 62 4.1 NR ND 774 236 62.5 ND
3/15/00 ND ND ND ND ND ND ND NR NR NR NR NR NR
12/11/01 ND ND ND ND ND ND ND ND ND ND ND ND ND
5/14/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
8/29/02 ND ND ND ND ND ND ND ND ND ND ND ND ND
11/11/02 ND ND ND ND ND ND ND ND ND ND ND ND ND
2/26/03 ND ND ND ND ND ND ND ND ND ND ND ND ND
5/16/03 ND ND ND ND ND ND ND ND ND ND ND ND ND
8/14/03 ND ND ND ND ND ND ND NR NR NR NR NR NR
11/5/03 ND ND ND ND ND ND ND NR NR NR NR NR NR
5/5/04 ND ND ND ND ND ND ND NR NR NR NR NR NR
11/18/04 ND ND ND ND ND ND ND NR NR NR NR NR NR
5/5/98 16,000 15,000 2,500 9,500 43,000 ND 750 220 970 NR NR NR 0.19
7/29/98 14,000 14,000 2,200 8,500 38,700 ND 1,900 NR 730 36,300 20,300 5,078 44
3/15/00 6,300 3,800 2,200 7,500 19,800 ND 1,300 NR NR NR NR NR NR
12/10/01 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY
5/14/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
8/29/02 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY
11/11/02 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY
2/26/03 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY
5/16/03 10 2.8 5.5 37 55.3 ND 13 ND 2.3 320 450 120 5.85
8/14/03 3.8 2.8 10 32 48.6 ND 5.8 NR NR NR NR NR NR
11/5/03 10 4.8 10 41 65.8 ND 20 NR NR NR NR NR NR
5/5/04 5.36 J 0.572 2.88 18.99 27.802 0.465J 11 NR NR NR NR NR NR
11/18/04 J 0.925 J 0.373 ND J 1.43 2.728 ND 3.37 NR NR NR NR NR NR
MW-10
Well destroyed during construction activities
MW-10R
MW-11D
Well destroyed during construction activities
0
0
Well destroyed during construction activities
MW-12
Page 4 of 10
5,000 260,000 84,500 85,500 NL 20,000 70,000 50 400 NL NL NL 15,000
1 600 600 500 NL 20 70 0.02 0.4 420 4,200 210 15
TABLE 4.1
SUMMARY OF HISTORICAL GROUNDWATER QUALITY DATA FOR SELECTED COMPOUNDS
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
EDB (ug/L)Ethylbenzene
(ug/L)
Total Xylenes
(ug/L)
Well
Number
Sample
Date
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
C5-C8 Aliph
(ug/L)
C9-C12 Aliph
(ug/L)
C9-C10 Arom
(ug/L)
GCL
Benzene (ug/L)1,2-DCA (ug/L)Total BTEX
(ug/L)MTBE (ug/L)(ug/L)DIPE (ug/L)
NCGQS
Toluene (ug/L)
5/5/98 ND ND ND ND ND ND ND ND ND NR NR NR ND
7/29/98 ND ND ND ND ND ND ND NR ND ND ND ND ND
3/15/00 ND ND ND ND ND ND ND NR NR NR NR NR NR
12/11/01 ND ND ND ND ND ND ND ND ND ND ND ND ND
5/14/02 ND ND ND ND ND ND ND ND ND ND ND ND ND
8/29/02 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY
11/11/02 ND ND ND ND ND ND ND ND ND ND ND ND ND
2/26/03 ND ND ND ND ND ND ND ND ND ND ND ND ND
5/16/03 ND ND ND ND ND ND ND ND ND ND ND ND ND
8/14/03 ND ND ND ND ND ND ND NR NR NR NR NR NR
11/5/03 ND ND ND ND ND ND ND NR NR NR NR NR NR
5/5/04 ND ND ND ND ND ND ND NR NR NR NR NR NR
11/18/04 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/30/08 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/21/09 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/27/10 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/18/11 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/10/12 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/16/13 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/28/14 ND ND 0.17 J ND ND ND ND NR NR NR NR NR NR
5/5/98 ND ND ND ND ND ND ND ND ND NR NR NR ND
7/29/98 ND ND ND ND ND 1.4 ND NR ND ND ND ND ND
3/15/00 ND ND ND ND ND ND ND NR NR NR NR NR NR
12/11/01 ND ND ND ND ND ND ND ND ND ND ND ND ND
5/14/02 ND ND ND ND ND ND ND ND ND ND ND ND ND
8/29/02 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY
11/11/02 ND ND ND ND ND ND ND ND ND ND ND ND ND
2/26/03 ND ND ND ND ND ND ND ND ND ND ND ND ND
5/15/03 NS NS NS NS NS NS NS NS NS NS NS NS NS
8/14/03 ND ND ND ND ND 2.3 ND NR NR NR NR NR NR
11/5/03 ND ND ND ND ND J 1.2 ND NR NR NR NR NR NR
5/5/04 ND ND ND ND ND J 1.35 ND NR NR NR NR NR NR
11/18/04 ND ND ND ND ND 3.44 ND NR NR NR NR NR NR
4/2/98 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/5/98 NS NS NS NS NS NS NS NS NS NS NS NS NS
7/29/98 1.5 1 1.5 11.9 15.9 ND 4 ND ND 270 87.9 89 ND
3/15/00 3,900 13,000 2,300 13,400 32,600 ND ND NR NR NR NR NR NR
12/10/01 FP FP FP FP FP FP FP FP FP FP FP FP FP
5/14/02 FP FP FP FP FP FP FP FP FP FP FP FP FP
8/29/02 FP FP FP FP FP FP FP FP FP FP FP FP FP
11/11/02 FP FP FP FP FP FP FP FP FP FP FP FP FP
2/26/03 6,300 14,000 2,900 21,100 44,300 53 75 ND 48 22,000 24,000 4,700 14.3
5/16/03 3,400 5,400 1,400 8,300 18,500 72 110 ND 46 10,000 12,000 1,900 5.5
8/14/03 11,000 5,900 1,700 11,000 29,600 ND ND NR NR NR NR NR NR
11/5/03 4,500 2,000 780 4,900 12,180 ND J 50 NR NR NR NR NR NR
5/5/04 8,860 2,460 961 6,080 18,361 ND 207J NR NR NR NR NR NR
11/18/04 9,580 2,050 845 5,540 18,015 ND 554 NR NR NR NR NR NR
4/29/08 301 30.1 299 876 1,506.1 ND 30.0 NR NR NR NR NR NR
4/21/09 254 9.20 J 237 541 1,041.2 ND 27.4 NR NR NR NR NR NR
4/27/10 313 10.9 175 313.4 812.3 17 13.5 NR NR NR NR NR NR
4/18/11 395 26.7 384 810 1,615.7 ND ND NR NR NR NR NR NR
4/10/12 123 4.24J 160 314.4 601.64 ND ND NR NR NR NR NR NR
4/16/13 120 6.1 160 320 606.10 ND 3.2J NR NR NR NR NR NR
4/28/14 97 5.5 J 99 170 371.50 ND ND NR NR NR NR NR NR
MW-15
MW-13
Well destroyed during construction activities
MW-13R
MW-14
Well destroyed during construction activities
0
0
Page 5 of 10
5,000 260,000 84,500 85,500 NL 20,000 70,000 50 400 NL NL NL 15,000
1 600 600 500 NL 20 70 0.02 0.4 420 4,200 210 15
TABLE 4.1
SUMMARY OF HISTORICAL GROUNDWATER QUALITY DATA FOR SELECTED COMPOUNDS
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
EDB (ug/L)Ethylbenzene
(ug/L)
Total Xylenes
(ug/L)
Well
Number
Sample
Date
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
C5-C8 Aliph
(ug/L)
C9-C12 Aliph
(ug/L)
C9-C10 Arom
(ug/L)
GCL
Benzene (ug/L)1,2-DCA (ug/L)Total BTEX
(ug/L)MTBE (ug/L)(ug/L)DIPE (ug/L)
NCGQS
Toluene (ug/L)
7/29/98 ND ND ND ND ND ND ND ND ND ND ND ND ND
3/15/00 40 6 31 8 85 ND ND NR NR NR NR NR NR
12/11/01 ND ND 1 ND 1 ND ND ND ND ND ND ND ND
5/14/02 ND ND ND ND ND ND ND ND ND ND ND ND ND
8/29/02 ND 12 7 47 66 ND ND ND ND ND ND ND 17.3
11/11/02 ND ND 2 7 9 ND ND ND ND ND ND ND 5
2/26/03 ND ND 1.7 ND 1.7 ND ND ND ND ND ND ND ND
5/16/03 ND ND ND ND ND ND ND ND ND ND ND ND 13.2
8/14/03 ND ND ND ND ND ND ND NR NR NR NR NR NR
11/5/03 ND ND ND ND ND ND ND NR NR NR NR NR NR
5/5/04 ND ND ND ND ND ND ND NR NR NR NR NR NR
11/18/04 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/29/08 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/21/09 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/27/10 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/18/11 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/10/12 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/16/13 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/28/14 ND ND ND ND ND ND ND NR NR NR NR NR NR
7/29/98 27,000 15,000 2,100 8,400 52,500 67,000 4,300 65 1,800 120,000 30,500 7,160 17
3/15/00 FP FP FP FP FP FP FP FP FP FP FP FP FP
12/10/01 NS NS NS NS NS NS NS NS NS NS NS NS NS
5/14/02 NS NS NS NS NS NS NS NS NS NS NS NS NS
8/29/02 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY
11/11/02 14,000 27,000 2,600 17,500 61,100 4,100 ND ND 310 68,000 47,000 6,800 15.8
2/26/03 3,200 11,000 1,800 13,900 29,900 4,400 190 ND 56 18,000 22,000 4,400 9.6
5/15/03 250 1,300 460 4,200 6,210 470 ND ND 5.1 4,300 9,500 2,000 5.28
8/15/03 120 640 480 4,900 6,140 1,200 ND NR NR NR NR NR NR
11/5/03 560 720 360 4,000 5,640 12,000 160J NR NR NR NR NR NR
5/5/04 4,320 1,340 J 519 5,030 11,209 63,800 589J NR NR NR NR NR NR
11/18/04 6,180 J 988 ND 6,290 13,458 48,100 1,030J NR NR NR NR NR NR
8/21/98 570 2,500 490 2,870 6,430 ND ND 0.05 ND 9,300 13,000 2,900 79
3/15/00 1,000 460 370 1,670 3,500 ND 54 NR NR NR NR NR NR
12/11/01 560 330 320 1,290 2,500 33 ND ND ND 3,900 1,900 460 78.1
5/14/02 16 7 2 29 54 14 8 ND ND 480 120 ND ND
8/29/02 ND ND ND ND ND 8 4 ND ND ND ND ND 30.8
11/11/02 1 ND ND ND 1 12 3 ND ND ND ND ND 30.2
2/26/03 ND ND ND ND ND 15 3.3 ND ND ND ND ND 11.5
5/16/03 13 2.5 2.4 32.7 50.6 8.4 3.4 ND ND ND 150 ND ND
8/14/03 3.9 ND 1.3 5.5 10.7 19 4.2 NR NR NR NR NR NR
11/5/03 1.9 ND 1.2 ND 3.1 13 2.7 NR NR NR NR NR NR
5/5/04 ND ND ND ND ND 11.5 3.18 NR NR NR NR NR NR
11/18/04 ND ND ND ND ND 22.2 2.63 NR NR NR NR NR NR
4/29/08 ND ND ND ND ND 4.58 0.684 J NR NR NR NR NR NR
4/21/09 ND ND ND ND ND 6.00 0.595 J NR NR NR NR NR NR
4/27/10 ND ND ND ND ND 3.59 ND NR NR NR NR NR NR
4/18/11 ND ND ND ND ND 3.92 ND NR NR NR NR NR NR
4/10/12 ND ND ND ND ND 4.12 ND NR NR NR NR NR NR
4/16/13 ND ND ND ND ND 7.4 ND NR NR NR NR NR NR
4/28/14 ND ND ND ND ND 9.5 ND NR NR NR NR NR NR
MW-16
Well destroyed during construction activities
MW-17
0
0
MW-18
Page 6 of 10
5,000 260,000 84,500 85,500 NL 20,000 70,000 50 400 NL NL NL 15,000
1 600 600 500 NL 20 70 0.02 0.4 420 4,200 210 15
TABLE 4.1
SUMMARY OF HISTORICAL GROUNDWATER QUALITY DATA FOR SELECTED COMPOUNDS
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
EDB (ug/L)Ethylbenzene
(ug/L)
Total Xylenes
(ug/L)
Well
Number
Sample
Date
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
C5-C8 Aliph
(ug/L)
C9-C12 Aliph
(ug/L)
C9-C10 Arom
(ug/L)
GCL
Benzene (ug/L)1,2-DCA (ug/L)Total BTEX
(ug/L)MTBE (ug/L)(ug/L)DIPE (ug/L)
NCGQS
Toluene (ug/L)
3/15/00 24,000 22,000 2,300 10,700 59,000 77,000 2,700 NR NR NR NR NR NR
12/11/01 30,000 25,000 3,700 16,600 75,300 68,000 2,800 ND 1,000 ND ND ND ND
5/14/02 1,800 1,900 120 3,900 7,720 3,100 170 6 ND 7,300 5,300 1,000 ND
8/29/02 5,000 1,400 530 2,950 9,880 8,800 750 ND 310 11,000 950 ND ND
11/11/02 9,400 4,300 880 2,800 17,380 21,000 1,200 ND 630 40,000 9,800 ND 7
2/26/03 15,000 8,100 730 5,400 29,230 33,000 1,600 ND 720 50,000 9,800 1,400 7.2
5/16/03 7,700 6,400 630 4,400 19,130 17,000 720 J 13 550 33,000 23,000 ND ND
8/14/03 4,700 3,500 640 4,100 12,940 4,300 270 NR NR NR NR NR NR
11/5/03 8,800 4,900 810 4,400 18,910 13,000 830 NR NR NR NR NR NR
5/5/04 16,000 9,610 1,210 5,840 32,660 18,900 1,270 NR NR NR NR NR NR
11/18/04 19,000 8,430 1,270 5,460 34,160 49,600 1,710 NR NR NR NR NR NR
4/29/08 23,000 10,300 2,180 8,120 J 43,600 36,300 2,030 NR NR NR NR NR NR
4/21/09 18,400 10,900 1,860 7,910 J 39,070 23,100 1,480 J NR NR NR NR NR NR
4/27/10 18,000 11,600 1,970 9,580 41,150 16,300 1,010 NR NR NR NR NR NR
4/18/11 22,600 6,170 2,320 9,130 40,220 27,500 1,650 NR NR NR NR NR NR
4/10/12 22,900 3,890 1,990 6,120 34,900 28,000 1,070 NR NR NR NR NR NR
4/16/13 21,000 8,100 2,700 11,000 42,800 20,000 1,000 NR NR NR NR NR NR
4/28/14 FP FP FP FP FP FP FP FP FP FP FP FP FP
4/4/03 5,700 8,500 1,200 5,700 21,100 ND ND ND 240 6,300 2,500 240 ND
5/15/03 12,000 13,000 910 6,500 32,410 ND 790 J 36 360 34,000 15,000 ND 9.55
8/14/03 18,000 13,000 1,000 5,600 37,600 ND 550 NR NR NR NR NR NR
11/5/03 12,000 6,600 720 2,530 21,850 ND J 450 NR NR NR NR NR NR
5/5/04 16,600 8,880 1,150 3,490 30,120 ND J 406 NR NR NR NR NR NR
11/18/04 12,600 3,410 587 J 1,324 17,921 ND 500 NR NR NR NR NR NR
4/29/08
4/4/03 11,000 15,000 2,000 9,200 37,200 ND ND ND 160 16,000 7,800 980 7.62
5/15/03 16,000 17,000 1,800 7,900 42,700 120 1,300 26 300 49,000 17,000 ND 26.4
8/14/03 20,000 19,000 2,200 9,800 51,000 ND 930 NR NR NR NR NR NR
11/5/03 18,000 18,000 J 1,500 7,100 44,600 ND J 780 NR NR NR NR NR NR
5/5/04 23,500 22,000 2,460 11,190 59,150 ND 1,290 NR NR NR NR NR NR
11/18/04 20,000 15,500 1,620 6,820 43,940 ND 1,250 NR NR NR NR NR NR
4/29/08 FP FP FP FP FP FP FP FP FP FP FP FP FP
4/21/09 FP FP FP FP FP FP FP FP FP FP FP FP FP
4/27/10 FP FP FP FP FP FP FP FP FP FP FP FP FP
4/18/11 16,400 18,700 2,810 13,590 51,500 371J 690 NR NR NR NR NR NR
4/10/12 FP FP FP FP FP FP FP FP FP FP FP FP FP
4/16/13 FP FP FP FP FP FP FP FP FP FP FP FP FP
4/28/14 7,700 4,900 2,100 12,000 26,700 ND 210 NR NR NR NR NR NR
4/4/03 ND ND ND ND ND ND ND ND ND ND ND ND ND
5/16/03 ND ND ND ND ND ND ND ND ND ND ND ND 12.4
8/14/03 ND ND ND ND ND ND ND NR NR NR NR NR NR
11/5/03 ND ND ND ND ND ND ND NR NR NR NR NR NR
5/5/04 ND ND ND ND ND ND ND NR NR NR NR NR NR
11/18/04 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/29/08 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/21/09 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/27/10 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/18/11 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/10/12 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/16/13 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/28/14 ND ND ND ND ND ND ND NR NR NR NR NR NR
Well covered by concrete slab
0
MW-20
MW-21
MW-22
MW-19
0
Page 7 of 10
5,000 260,000 84,500 85,500 NL 20,000 70,000 50 400 NL NL NL 15,000
1 600 600 500 NL 20 70 0.02 0.4 420 4,200 210 15
TABLE 4.1
SUMMARY OF HISTORICAL GROUNDWATER QUALITY DATA FOR SELECTED COMPOUNDS
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
EDB (ug/L)Ethylbenzene
(ug/L)
Total Xylenes
(ug/L)
Well
Number
Sample
Date
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
C5-C8 Aliph
(ug/L)
C9-C12 Aliph
(ug/L)
C9-C10 Arom
(ug/L)
GCL
Benzene (ug/L)1,2-DCA (ug/L)Total BTEX
(ug/L)MTBE (ug/L)(ug/L)DIPE (ug/L)
NCGQS
Toluene (ug/L)
4/4/03 12,000 12,000 1,700 8,100 33,800 ND ND ND 93 10,000 3,900 480 ND
5/15/03 16,000 13,000 1,400 4,800 35,200 ND 46 ND 140 45,000 20,000 ND ND
8/14/03 20,000 8,700 1,700 7,500 37,900 ND 1,100 NR NR NR NR NR NR
11/5/03 16,000 3,800 1,300 5,000 26,100 ND 810 NR NR NR NR NR NR
5/5/04 18,100 3,540 1,350 3,076 26,066 ND ND NR NR NR NR NR NR
11/18/04 15,700 2,410 1,430 2,648 22,188 ND 664 NR NR NR NR NR NR
4/29/08 FP FP FP FP FP FP FP FP FP FP FP FP FP
4/21/09 FP FP FP FP FP FP FP FP FP FP FP FP FP
4/27/10 6,330 1,140 1,350 3,475 12,295 ND 228 NR NR NR NR NR NR
4/18/11 6,790 1,960 2,170 6,312 17,232 ND 317 NR NR NR NR NR NR
4/10/12 FP FP FP FP FP FP FP FP FP FP FP FP FP
4/16/13 7,000 1,300 2,400 5,900 16,600 ND 95J NR NR NR NR NR NR
4/28/14 4,900 700 1,800 3,300 10,700 ND ND NR NR NR NR NR NR
4/4/03 10,000 6,600 890 3,400 20,890 ND 940 29 45 11,000 3,300 390 36
5/15/03 25,000 37,000 2,300 8,800 73,100 ND ND 180 290 74,000 26,000 ND 879
8/14/03 27,000 43,000 3,300 11,000 84,300 ND ND NR NR NR NR NR NR
11/6/03 21,000 27,000 J 1,900 8,200 58,100 ND ND NR NR NR NR NR NR
5/5/04 24,200 27,700 J 1,890 7,950 61,740 ND ND NR NR NR NR NR NR
11/18/04 20,500 28,500 2,130 9,500 60,630 ND J 530 NR NR NR NR NR NR
4/29/08 FP FP FP FP FP FP FP FP FP FP FP FP FP
4/21/09 FP FP FP FP FP FP FP FP FP FP FP FP FP
4/27/10 FP FP FP FP FP FP FP FP FP FP FP FP FP
4/18/11 16,000 32,700 3,380 16,230 68,310 ND ND NR NR NR NR NR NR
4/10/12 FP FP FP FP FP FP FP FP FP FP FP FP FP
4/16/13 14,000 31,000 4,100 19,100 68,200 ND 90J NR NR NR NR NR NR
4/28/14 7,900 9,500 2,000 9,200 28,600 ND 170 NR NR NR NR NR NR
5/5/04 930 394 152 2,832 4,308 ND 88.4 ND 3.04 3,400 3,300 570 J 1.33
11/19/04 141 32.4 10.3 734 917.7 ND ND NR NR NR NR NR NR
4/30/08 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/21/09 2.84 0.559 J 2.14 3.08 J 8.619 ND ND NR NR NR NR NR NR
4/27/10 10.6 ND 3.51 1.9J 16.01 1.49J 3.14 NR NR NR NR NR NR
4/18/11 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/10/12 0.241J ND ND ND 0.241J 3.20 6.30 NR NR NR NR NR NR
4/16/13 ND ND ND ND ND 2.8 J 2.3J NR NR NR NR NR NR
4/29/14 ND ND ND ND ND ND ND NR NR NR NR NR NR
5/5/04 16 ND ND ND 16 0.719J J 0.585 ND ND ND ND ND 6.5
11/19/04 5.29 ND ND ND 5.29 2.87 1.42 NR NR NR NR NR NR
4/30/08 ND ND ND ND ND 12.2 5.06 NR NR NR NR NR NR
4/21/09 ND ND ND ND ND 20.6 6.64 NR NR NR NR NR NR
4/27/10 ND ND ND ND ND 32.3 9.56 NR NR NR NR NR NR
4/18/11 ND ND ND ND ND 14.1 3.58 NR NR NR NR NR NR
4/10/12 ND ND ND ND ND 23.4 6.71 NR NR NR NR NR NR
4/16/13 ND ND ND ND ND 30 3.9J NR NR NR NR NR NR
4/29/14 ND ND ND ND ND 48 3.2 NR NR NR NR NR NR
5/5/04 29,000 30,800 2,110 10,360 72,270 2,860 1,790 320 1,600 150,000 31,000 ND 130
11/18/04 29,800 31,800 2,270 11,440 75,310 8,170 2,200 NR NR NR NR NR NR
4/30/08 29,400 35,200 2,650 13,190 80,440 1,770 1,420 NR NR NR NR NR NR
4/22/09 28,800 35,000 2,850 15,630 82,280 3,000 2,610 NR NR NR NR NR NR
4/27/10 23,000 27,100 3,340 16,240 69,680 3,280 1270J NR NR NR NR NR NR
4/18/11 13,100 15,100 1,850 18,410 48,460 1,460 1,560 NR NR NR NR NR NR
4/10/12 15,800 19,600 2,160 15,970 53,530 570J 783J NR NR NR NR NR NR
4/16/13 18,000 19,000 2,500 17,000 56,500 2,200 910 NR NR NR NR NR NR
4/29/14 13,000 14,000 2,100 14,000 43,100 1,300 580 NR NR NR NR NR NR
0
MW-25
MW-26
MW-27
MW-23
MW-24
Page 8 of 10
5,000 260,000 84,500 85,500 NL 20,000 70,000 50 400 NL NL NL 15,000
1 600 600 500 NL 20 70 0.02 0.4 420 4,200 210 15
TABLE 4.1
SUMMARY OF HISTORICAL GROUNDWATER QUALITY DATA FOR SELECTED COMPOUNDS
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
EDB (ug/L)Ethylbenzene
(ug/L)
Total Xylenes
(ug/L)
Well
Number
Sample
Date
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
C5-C8 Aliph
(ug/L)
C9-C12 Aliph
(ug/L)
C9-C10 Arom
(ug/L)
GCL
Benzene (ug/L)1,2-DCA (ug/L)Total BTEX
(ug/L)MTBE (ug/L)(ug/L)DIPE (ug/L)
NCGQS
Toluene (ug/L)
5/5/04 9.23 1.52 6.41 13.72 30.88 7.48 ND ND ND 1,100 230 140 9.63
11/18/04 6.89 ND 1.96 ND 8.85 ND ND NR NR NR NR NR NR
4/30/08 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/21/09 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/27/10 0.758J ND 0.372J ND 1.13J ND ND NR NR NR NR NR NR
4/18/11 0.759J ND ND ND ND ND ND NR NR NR NR NR NR
4/10/12 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/16/13 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/28/14 ND ND 0.33 J ND ND ND ND NR NR NR NR NR NR
4/21/09 22.7 ND 13.1 285 320.8 ND ND NR NR NR NR NR NR
4/27/10 24.6 3.28 5.58 47.8 81.26 ND ND NR NR NR NR NR NR
4/18/11 25.5 6.2 3.42 16.604 51.724 ND ND NR NR NR NR NR NR
4/10/12 ND 6.11 2.34 10.9 19.35 ND ND NR NR NR NR NR NR
4/16/13 ND ND 2.1 8.5 10.6 ND ND NR NR NR NR NR NR
4/28/14 ND ND 1.0 3.5 4.5 ND ND NR NR NR NR NR NR
4/27/10 17,900 5,230 2,410 8,310 33,850 ND ND NR NR NR NR NR NR
4/18/11 4,890 4,070 1,250 5,130 15,340 205J 370 NR NR NR NR NR NR
4/10/12 11,000 3,420 1,480 4,970 20,870 a 431 NR NR NR NR NR NR
4/16/13 8,300 2,000 1,300 3,800 15,400 200J 320J NR NR NR NR NR NR
4/29/14 4,100 930 880 2,300 8,210 300 180 NR NR NR NR NR NR
12/21/01 150 250 53 232 685 ND ND ND ND NR NR NR NR
5/14/02 290 33 ND 69 392 ND ND ND ND 540 120 ND ND
8/29/02 110 45 23 28 206 ND ND ND ND 290 ND ND 15.7
11/11/02 210 75 26 55 366 ND ND ND ND 360 100 ND 6.8
2/27/03 390 99 32 122 643 ND ND ND ND 730 260 ND ND
5/15/03 360 220 64 140 784 ND ND ND 1.3 850 410 ND ND
8/15/03 460 300 76 215 1,051 ND ND NR NR NR NR NR NR
11/6/03 540 210 60 143 953 ND ND NR NR NR NR NR NR
5/6/04 938 556 164 397 2,055 ND ND NR NR NR NR NR NR
11/19/04 978 298 130 209.9 1615.9 ND J 16.3 NR NR NR NR NR NR
4/30/08 379 112 64.6 74.5 J 630.1 ND ND NR NR NR NR NR NR
4/21/09 759 293 144 248 1,444 ND ND NR NR NR NR NR NR
4/27/10 347 128 74.7 117.2 667 ND ND NR NR NR NR NR NR
4/18/11 3,140 3,290 788 2,314 9,532 ND 57.8 NR NR NR NR NR NR
4/11/12 355 127 113 121.1 716.1 ND ND NR NR NR NR NR NR
4/18/13 380 210 170 210 970 ND ND NR NR NR NR NR NR
4/29/14 320 210 160 240 930 ND ND NR NR NR NR NR NR
12/21/01 23 140 35 172 370 ND 10 ND ND NR NR NR NR
5/14/02 36 30 2 146 214 5 15 ND ND 180 180 ND ND
8/29/02 ND ND ND ND ND 3 16 ND ND ND ND ND ND
11/11/02 26 12 11 37 86 8 22 ND ND ND ND ND ND
2/27/03 18 4.9 19 23.2 65.1 14 21 ND ND ND ND ND ND
5/15/03 24 4.7 25 22.9 76.6 11 11 ND ND ND ND ND ND
8/15/03 34 6.2 28 44 112.2 14 22 NR NR NR NR NR NR
11/6/03 14 2.6 17 9.7 43.3 4.2 6.9 NR NR NR NR NR NR
5/6/04 11.5 1.55 22.1 15.62 51 2.1 5.85 NR NR NR NR NR NR
11/19/04 5.86 3.06 9.49 12.31 30.72 J 1.51 7.18 NR NR NR NR NR NR
4/30/08 9.36 0.334 J 18.9 3.66 32.254 2.64 7.49 NR NR NR NR NR NR
4/22/09 10.4 1.05 28.2 22.55 J 62.2 ND 7.67 NR NR NR NR NR NR
4/27/10 3.02 ND 2.34 ND 5.36 ND 2.06 NR NR NR NR NR NR
4/18/11 ND ND ND ND ND 1.88J 0.876J NR NR NR NR NR NR
4/10/12 1.42 ND 1.82 0.746J 3.986J 1.81J 5.55 NR NR NR NR NR NR
4/18/13 0.56 ND 1.3 3.1 4.96 2.3J 3.4J NR NR NR NR NR NR
4/29/14 0.98 0.18 J 3.0 6.3 10.46 ND ND NR NR NR NR NR NR
0
MW-29
MW-30
MWWB-1
MWWB-2
MW-28
Page 9 of 10
5,000 260,000 84,500 85,500 NL 20,000 70,000 50 400 NL NL NL 15,000
1 600 600 500 NL 20 70 0.02 0.4 420 4,200 210 15
TABLE 4.1
SUMMARY OF HISTORICAL GROUNDWATER QUALITY DATA FOR SELECTED COMPOUNDS
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
EDB (ug/L)Ethylbenzene
(ug/L)
Total Xylenes
(ug/L)
Well
Number
Sample
Date
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
C5-C8 Aliph
(ug/L)
C9-C12 Aliph
(ug/L)
C9-C10 Arom
(ug/L)
GCL
Benzene (ug/L)1,2-DCA (ug/L)Total BTEX
(ug/L)MTBE (ug/L)(ug/L)DIPE (ug/L)
NCGQS
Toluene (ug/L)
12/21/01 1,400 2,300 410 2,060 6,170 ND ND 2 11 NR NR NR NR
5/14/02 1,800 1,100 320 1,420 4,640 ND ND 3 ND 4,500 1,800 370 ND
8/29/02 1,500 2,600 550 2,200 6,850 ND ND ND 4 4,900 2,700 490 20.1
11/11/02 290 340 120 380 1130 ND ND ND 4 1,100 660 100 ND
2/27/03 180 130 81 205 596 ND 19 ND 2.3 630 400 ND ND
5/15/03 330 120 84 191 725 ND 19 ND 4.8 1,400 570 ND ND
8/15/03 220 120 68 155 563 ND 30 NR NR NR NR NR NR
11/6/03 370 130 83 176 759 ND 34 NR NR NR NR NR NR
5/6/04 290 101 93.2 171.6 656 ND 31.2 NR NR NR NR NR NR
11/19/04 689 199 147 285 1320 ND 72.5 NR NR NR NR NR NR
4/30/08 256 15.1 37.0 49.2 357.3 ND 20.4 NR NR NR NR NR NR
4/22/09 246 21.9 44.9 60.35 J 373.15 ND 28.5 NR NR NR NR NR NR
4/27/10 337 78.2 52.8 56.18 524.18 ND 6.64J NR NR NR NR NR NR
4/18/11 1,390 416 323 395.4J 2129 46.8J 41.9J NR NR NR NR NR NR
4/10/12 165 9.01 32.6 29.5 236.11 ND 6.70J NR NR NR NR NR NR
4/16/13 210 50 66 83 409 4.3J 7.0 NR NR NR NR NR NR
4/29/14 150 34 38 64 286 5.1 L 6.4 NR NR NR NR NR NR
12/21/01 310 6 16 25 357 ND 170 ND 3 NR NR NR NR
5/14/02 64 13 4 56 137 ND 43 ND ND 290 100 ND ND
8/29/02 480 ND ND ND 480 ND 170 ND ND 220 ND ND ND
11/11/02 4 ND ND ND 4 ND 4 ND ND ND ND ND ND
2/27/03 290 54 21 ND 365 ND 22 ND ND 320 100 ND ND
5/15/03 620 81 ND ND 701 ND 36 ND ND 1,300 210 ND ND
8/15/03 24 2.4 2.6 ND 29 ND 2 NR NR NR NR NR NR
11/6/03 1,400 J 19 J 15 ND 1,434 ND 110 NR NR NR NR NR NR
5/6/04 962 31 J 13.3 ND 1,006.3 ND 88 NR NR NR NR NR NR
11/19/04 104 J 2.94 J 3.86 J 3.97 114.77 ND 15.9 NR NR NR NR NR NR
4/30/08 10.5 1.35 0.742 J 2.624 J 15.216 ND 3.77 NR NR NR NR NR NR
4/22/09 22.0 3.38 7.56 6.215 39.155 ND 6.86 NR NR NR NR NR NR
4/27/10 32.9 2.74 4.23 3.0J 42.87 1.65J 10.8 NR NR NR NR NR NR
4/18/11 ND ND ND ND ND ND ND NR NR NR NR NR NR
4/10/12 5.10 0.546J 2.58 0.537J 8.763 ND 3.78 NR NR NR NR NR NR
4/16/13 0.89 ND ND ND 0.89 ND 1.4J NR NR NR NR NR NR
4/29/14 1.8 0.90 1.2 1.3 J 5.2 ND 0.89 NR NR NR NR NR NR
Notes:
ug/L - micrograms per liter BTEX - Benzene, toluene, ethylbenzene, and xylenes C5-C8 Aliph - C5-C8 Aliphatics
NL - not listed MTBE - methyl tert-butyl ether C9-C12 Aliph - C9-C12 Aliphatics
NR - laboratory analysis not requested DIPE - diisopropyl ether C9-C10 Arom - C9-C10 Aromatics
NS - not sampled EDB - 1,2-dibromoethane 1,2-DCA - 1,2-dichloroethane
FP - well not sampled due to the presence of free product Bold values exceed NC Groundwater Quality Standards (NCGQS)
J - estimated value Shaded values exceed Gross Contamination Level (GCL)
Note the following NCGQS changes effective 1/13/10: Ethylbenzene 550 ug/L to 600 ug/L, Toluene 1000 ug/L to 600 ug/L, Total Xylenes 550 ug/L to 500 ug/L, MTBE 200 ug/L to 20 ug/L, Ethylene Dibromide (EDB) 0.0004 ug/L
to 0.02 ug/L and 1,2-Dichloroethane (1,2-DCA) 0.38 ug/L to 0.4 ug/L
ND - Not detected at or above laboratory PQL
NDa - Not detected at or above laboratory PQL and laboratory PQL exceeds the NCGQS
L - Laboratory fortified blank/laboratory control sample recovery and duplicate recovery are outside of control limits. Reported value for this compound is likely to be biased on the high side.
MWWB-4
MWWB-3
Page 10 of 10
WELL
NUMBER DATE (ft)(ft)
FP THICKNESS
(ft)(ft)
CORRECTED
DTW (ft)(ft)
MW-1 4/2/1998 96.69 7.44 4.50 11.94 8.66 88.04
MW-1 5/5/1998 96.69 8.01 3.94 11.95 9.07 87.62
MW-1 7/29/1998 96.69 11.81 1.26 13.07 12.15 84.54
MW-1 3/15/2000 96.69 11.62 1.09 12.71 11.91 84.78
MW-1 12/10/2001 96.69 NM NM NM NM NM
MW-1 5/14/2002 96.69 NM NM NM NM NM
MW-1 8/29/2002 96.69 NM NM NM NM NM
MW-1 11/11/2002 96.69 NM NM NM NM NM
MW-1 2/26/2003 96.69 NM NM NM NM NM
MW-1 5/28/2003 96.69 8.55 0.90 9.45 8.79 87.90
MW-1 8/14/2003 96.69 NM NM NM NM NM
MW-1 11/5/2003 97.69 NM NM NM NM NM
MW-1 5/5/2004 97.69 --0.00 13.75 --83.94
MW-1 11/18/2004 97.69 NM NM NM NM NM
MW-2 4/2/1998 95.53 --0.00 7.40 --88.13
MW-2 5/5/1998 95.53 NM NM NM NM NM
MW-2 7/29/1998 95.53 --0.00 11.08 --84.45
MW-2 3/15/2000 95.53 --0.00 11.15 --84.38
MW-2 12/10/2001 95.53 --0.00 16.23 --79.30
MW-2 5/14/2002 95.53 --0.00 14.72 --80.81
MW-2 8/29/2002 95.53 --0.00 17.41 --78.12
MW-2 11/11/2002 95.53 --0.00 13.69 --81.84
MW-2 2/26/2003 95.53 --0.00 11.33 --84.20
MW-2 5/15/2003 95.53 --0.00 9.67 --85.86
MW-2 8/14/2003 95.53 --0.00 7.36 --88.17
MW-2 11/5/2003 96.53 --0.00 10.08 --86.45
MW-2 5/5/2004 96.53 --0.00 11.69 --84.84
MW-2 11/18/2004 96.53 --0.00 11.4 --85.13
MW-2R 4/29/2008 95.84 --0.00 12.59 --83.25
MW-2R 4/21/2009 95.84 --0.00 11.15 --84.69
MW-2R 4/27/2010 95.84 --0.00 10.69 --85.15
MW-2R 4/18/2011 95.84 --0.00 12.17 --83.67
MW-2R 4/10/2012 95.84 --0.00 12.59 --83.25
MW-2R 4/16/2013 95.84 --0.00 11.86 --83.98
MW-2R 4/28/2014 95.84 --0.00 9.08 --86.76
MW-3 4/2/1998 95.94 --0.00 7.84 --88.10
MW-3 5/5/1998 95.94 NM NM NM NM NM
MW-3 7/29/1998 95.94 --0.00 11.50 --84.44
MW-3 3/15/2000 95.94 --4/28/2014 11.36 --84.58
MW-3 12/10/2001 95.94 --0.00 16.19 --79.75
MW-3 5/14/2002 95.94 --0.00 14.88 --81.06
MW-3 8/29/2002 95.94 --0.00 17.46 --78.48
MW-3 11/11/2002 95.94 --0.00 14.43 --81.51
MW-3 2/26/2003 95.94 --0.00 12.11 --83.83
MW-3 5/15/2003 95.94 --0.00 10.02 --85.92
MW-3 8/14/2003 95.94 --0.00 7.76 --88.18
MW-3 11/5/2003 95.94 --0.00 10.46 --85.48
MW-3 5/5/2004 95.94 --0.00 12.08 --83.86
MW-3 11/18/2004 95.94 --0.00 12.22 --83.72
Well destroyed during construction activities in 2005
Well destroyed during construction activities in 2005
Well destroyed during construction activities in 2005
TABLE 4.2
SUMMARY OF HISTORICAL GROUNDWATER ELEVATION DATA
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
Page 1 of 10
WELL
NUMBER DATE (ft)(ft)
FP THICKNESS
(ft)(ft)
CORRECTED
DTW (ft)(ft)
SUMMARY OF HISTORICAL GROUNDWATER ELEVATION DATA
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
MW-4 4/2/1998 96.63 9.54 3.37 12.91 10.45 86.18
MW-4 5/5/1998 96.63 10.17 2.60 12.77 10.87 85.76
MW-4 7/29/1998 96.63 13.80 1.09 14.89 14.09 82.54
MW-4 3/15/2000 96.63 13.21 0.59 13.80 13.37 83.26
MW-4 12/10/2001 96.63 NM NM NM NM NM
MW-4 5/14/2002 96.63 NM NM NM NM NM
MW-4 8/29/2002 96.63 NM NM NM NM NM
MW-4 11/11/2002 96.63 NM NM NM NM NM
MW-4 2/26/2003 96.63 NM NM NM NM NM
MW-4 5/28/2003 96.63 10.48 0.30 10.78 10.56 86.07
MW-4 8/14/2003 96.63 NM NM NM NM NM
MW-4 11/5/2003 96.63 NM NM NM NM NM
MW-4 5/5/2004 96.63 --0.00 17.03 --79.60
MW-4 11/18/2004 96.63 NM NM NM NM NM
0
MW-5 4/2/1998 96.84 --0.00 9.13 --87.71
MW-5 5/5/1998 96.84 NM NM NM NM NM
MW-5 7/29/1998 96.84 --0.00 12.15 --84.69
MW-5 3/15/2000 96.84 --0.00 12.23 --84.61
MW-5 12/10/2001 96.84 NM NM NM NM NM
MW-5 5/14/2002 96.84 NM NM NM NM NM
MW-5 8/29/2002 96.84 NM NM NM NM NM
MW-5 11/11/2002 96.84 NM NM NM NM NM
MW-5 2/26/2003 96.84 NM NM NM NM NM
MW-5 5/28/2003 96.84 8.54 0.01 8.55 8.54 88.30
MW-5 8/14/2003 96.84 NM NM NM NM NM
MW-5 11/5/2003 96.84 NM NM NM NM NM
MW-5 5/5/2004 96.84 --0.00 14.15 --82.69
MW-5 11/18/2004 96.84 NM NM NM NM NM
0
MW-6 4/2/1998 96.69 11.42 2.90 14.32 12.20 84.49
MW-6 5/5/1998 96.69 11.92 2.71 14.63 12.65 84.04
MW-6 7/29/1998 96.69 15.41 1.41 16.82 15.79 80.90
MW-6 3/15/2000 96.69 14.92 2.05 16.97 15.47 81.22
MW-6 12/10/2001 96.69 NM NM NM NM NM
MW-6 5/14/2002 96.69 NM NM NM NM NM
MW-6 8/29/2002 96.69 NM NM NM NM NM
MW-6 11/11/2002 96.69 NM NM NM NM NM
MW-6 2/26/2003 96.69 NM NM NM NM NM
MW-6 5/28/2003 96.69 --0.00 11.84 --84.85
MW-6 8/14/2003 96.69 NM NM NM NM NM
MW-6 11/5/2003 96.69 NM NM NM NM NM
MW-6 5/5/2004 96.69 --0.00 16.92 --79.77
MW-6 11/18/2004 96.69 NM NM NM NM NM
MW-6R 4/29/2008 96.41 --0.00 14.85 --81.56
MW-6R 4/21/2009 96.41 --0.00 13.30 --83.11
MW-6R 4/27/2010 96.41 --0.00 12.61 --83.80
MW-6R 4/18/2011 96.41 --0.00 14.46 --81.95
MW-6R 4/10/2012 96.41 --0.00 14.51 --81.90
MW-6R 4/16/2013 96.41 --0.00 13.73 --82.68
MW-6R 4/28/2014 96.41 --0.00 11.23 --85.18
Well destroyed during construction activities in 2005
Well destroyed during construction activities in 2005
Well destroyed during construction activities in 2005
Page 2 of 10
WELL
NUMBER DATE (ft)(ft)
FP THICKNESS
(ft)(ft)
CORRECTED
DTW (ft)(ft)
SUMMARY OF HISTORICAL GROUNDWATER ELEVATION DATA
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
MW-7 4/2/1998 96.68 --0.00 9.39 --87.29
MW-7 5/5/1998 96.68 NM NM NM NM NM
MW-7 7/29/1998 96.68 NM NM NM NM NM
MW-7 3/15/2000 96.68 12.35 0.58 12.93 12.51 84.17
MW-7 12/10/2001 96.68 NM NM NM NM NM
MW-7 5/14/2002 96.68 NM NM NM NM NM
MW-7 8/29/2002 96.68 NM NM NM NM NM
MW-7 11/11/2002 96.68 NM NM NM NM NM
MW-7 2/26/2003 96.68 NM NM NM NM NM
MW-7 5/28/2003 96.68 --0.00 9.30 --87.38
MW-7 8/14/2003 96.68 NM NM NM NM NM
MW-7 11/5/2003 96.68 NM NM NM NM NM
MW-7 5/5/2004 96.68 --0.00 16.85 --79.83
MW-7 11/18/2004 96.68 NM NM NM NM NM
0
MW-8 4/2/1998 97.09 11.34 0.03 11.37 11.35 85.74
MW-8 5/5/1998 97.09 12.04 0.02 12.06 12.05 85.04
MW-8 7/29/1998 97.09 15.06 0.24 15.30 15.12 81.97
MW-8 3/15/2000 97.09 13.98 0.57 14.55 14.13 82.96
MW-8 12/10/2001 97.09 NM NM NM NM NM
MW-8 5/14/2002 97.09 NM NM NM NM NM
MW-8 8/29/2002 97.09 NM NM NM NM NM
MW-8 11/11/2002 97.09 NM NM NM NM NM
MW-8 2/26/2003 97.09 NM NM NM NM NM
MW-8 5/28/2003 97.09 11.40 0.02 11.42 11.41 85.68
MW-8 8/14/2003 97.09 NM NM NM NM NM
MW-8 11/5/2003 97.09 NM NM NM NM NM
MW-8 5/5/2004 97.09 --0.00 21.29 --75.80
MW-8 11/18/2004 97.09 NM NM NM NM NM
0
MW-9 5/5/1998 93.33 10.55 0.56 11.11 10.70 82.63
MW-9 7/29/1998 93.33 13.51 1.25 14.76 13.85 79.48
MW-9 3/15/2000 93.33 NM NM NM NM NM
MW-9 12/10/2001 93.33 NM NM NM NM NM
MW-9 5/14/2002 93.33 14.08 0.02 14.10 14.09 79.24
MW-9 8/29/2002 93.33 DRY DRY DRY DRY DRY
MW-9 11/11/2002 93.33 --0.00 16.13 --77.20
MW-9 2/26/2003 93.33 --0.00 13.74 --79.59
MW-9 5/15/2003 93.33 --0.00 11.94 --81.39
MW-9 8/14/2003 93.33 --0.00 13.10 --80.23
MW-9 11/5/2003 93.33 --0.00 12.59 --80.74
MW-9 5/5/2004 93.33 --0.00 14.03 --79.30
MW-9 11/18/2004 93.33 --0.00 14.07 --79.26
--
MW-10 7/29/1998 93.38 --0.00 11.99 --81.39
MW-10 3/15/2000 93.38 --0.00 11.02 --82.36
MW-10 12/10/2001 93.38 --0.00 15.82 --77.56
MW-10 5/14/2002 93.38 --0.00 15.66 --77.72
MW-10 8/29/2002 93.38 DRY DRY DRY DRY DRY
MW-10 11/11/2002 93.38 DRY DRY DRY DRY DRY
MW-10 2/26/2003 93.38 --0.00 13.74 --79.64
MW-10 5/15/2003 93.38 --0.00 10.04 --83.34
Well destroyed during construction activities in 2005
Well destroyed during construction activities in 2005
Well destroyed during construction activities in 2005
Page 3 of 10
WELL
NUMBER DATE (ft)(ft)
FP THICKNESS
(ft)(ft)
CORRECTED
DTW (ft)(ft)
SUMMARY OF HISTORICAL GROUNDWATER ELEVATION DATA
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
MW-10 8/15/2003 93.38 --0.00 12.81 --80.57
MW-10 11/5/2003 93.38 --0.00 10.89 --82.49
MW-10 5/5/2004 93.38 --0.00 14.24 --79.14
MW-10 11/18/2004 93.38 --0.00 12.35 --81.03
MW-10R 4/29/2008 95.11 --0.00 13.81 --81.30
MW-10R 4/21/2009 95.11 --0.00 12.22 --82.89
MW-10R 4/27/2010 95.11 --0.00 12.12 --82.99
MW-10R 4/18/2011 95.11 --0.00 13.27 --81.84
MW-10R 4/10/2012 95.11 --0.00 13.63 --81.48
MW-10R 4/16/2013 95.11 --0.00 12.92 --82.19
MW-10R 4/28/2014 95.11 --0.00 10.71 --84.40
0
MW-11D 7/29/1998 97.07 --0.00 14.00 --83.07
MW-11D 3/15/2000 97.07 --0.00 13.58 --83.49
MW-11D 12/10/2001 97.07 --0.00 18.35 --78.72
MW-11D 5/14/2002 97.07 NM NM NM NM NM
MW-11D 8/29/2002 97.07 --0.00 19.67 --77.4
MW-11D 11/11/2002 97.07 --0.00 17.57 --79.5
MW-11D 2/26/2003 97.07 --0.00 15.30 --81.77
MW-11D 5/15/2003 97.07 --0.00 12.36 --84.71
MW-11D 8/14/2003 97.07 --0.00 12.71 --84.36
MW-11D 11/5/2003 97.07 --0.00 12.83 --84.24
MW-11D 5/5/2004 97.07 --0.00 14.68 --82.39
MW-11D 11/18/2004 97.07 --0.00 14.43 --82.64
0
MW-12 7/29/1998 96.98 --0.00 14.01 --82.97
MW-12 3/15/2000 96.98 --0.00 13.56 --83.42
MW-12 12/10/2001 96.98 --0.00 18.04 --78.94
MW-12 5/14/2002 96.98 --0.00 17.82 --79.16
MW-12 8/29/2002 96.98 DRY DRY DRY DRY DRY
MW-12 11/11/2002 96.98 DRY DRY DRY DRY DRY
MW-12 2/26/2003 96.98 DRY DRY DRY DRY DRY
MW-12 5/15/2003 96.98 --0.00 11.85 --85.13
MW-12 8/14/2003 96.98 --0.00 17.30 --79.68
MW-12 11/5/2003 96.98 --0.00 12.64 --84.34
MW-12 5/5/2004 96.98 --0.00 15.25 --81.73
MW-12 11/18/2004 96.98 --0.00 15.91 --81.07
MW-13 7/29/1998 95.48 --0.00 13.53 --81.95
MW-13 3/15/2000 95.48 --0.00 12.72 --82.76
MW-13 12/10/2001 95.48 --0.00 17.27 --78.21
MW-13 5/14/2002 95.48 --0.00 16.19 --79.29
MW-13 8/29/2002 95.48 DRY DRY DRY DRY DRY
MW-13 11/11/2002 95.48 --0.00 15.7 --79.78
MW-13 2/26/2003 95.48 --0.00 13.43 --82.05
MW-13 5/15/2003 95.48 --0.00 11.59 --83.89
MW-13 8/14/2003 95.48 --0.00 11.00 --84.48
MW-13 11/5/2003 95.48 --0.00 12.13 --83.35
MW-13 5/5/2004 95.48 --0.00 13.67 --81.81
MW-13 11/18/2004 95.48 --0.00 13.52 --81.96
Well destroyed during construction activities in 2005
Well destroyed during construction activities in 2005
Well destroyed during construction activities in 2005
Well destroyed during construction activities in 2005
Page 4 of 10
WELL
NUMBER DATE (ft)(ft)
FP THICKNESS
(ft)(ft)
CORRECTED
DTW (ft)(ft)
SUMMARY OF HISTORICAL GROUNDWATER ELEVATION DATA
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
MW-13R 4/29/2008 95.88 --0.00 12.40 --83.48
MW-13R 4/21/2009 95.88 --0.00 11.81 --84.07
MW-13R 4/27/2010 95.88 --0.00 11.85 --84.03
MW-13R 4/18/2011 95.88 --0.00 12.95 --82.93
MW-13R 4/10/2012 95.88 --0.00 13.39 --82.49
MW-13R 4/16/2013 95.88 --0.00 12.68 --83.20
MW-13R 4/28/2014 95.88 --0.00 10.43 --85.45
MW-14 7/29/1998 96.64 --0.00 12.19 --84.45
MW-14 3/15/2000 96.64 --0.00 12.12 --84.52
MW-14 12/10/2001 96.64 --0.00 17.05 --79.59
MW-14 5/14/2002 96.64 --0.00 15.62 --81.02
MW-14 8/29/2002 96.64 DRY DRY DRY DRY DRY
MW-14 11/11/2002 96.64 --0.00 14.94 --81.70
MW-14 2/26/2003 96.64 --0.00 12.59 --84.05
MW-14 5/15/2003 96.64 --0.00 10.63 --86.01
MW-14 8/14/2003 96.64 --0.00 9.15 --87.49
MW-14 11/5/2003 96.64 --0.00 11.03 --85.61
MW-14 5/5/2004 96.64 --0.00 12.77 --83.87
MW-14 11/18/2004 96.64 --0.00 12.35 --84.29
MW-15 7/29/1998 88.82 --0.00 11.48 --77.34
MW-15 3/15/2000 88.82 --0.00 9.60 --79.22
MW-15 12/10/2001 88.82 13.41 1.49 14.90 13.81 75.01
MW-15 5/14/2002 88.82 12.49 0.11 12.60 12.52 76.30
MW-15 8/29/2002 88.82 15.21 0.95 16.16 15.47 73.35
MW-15 11/11/2002 88.82 11.42 0.05 11.47 11.43 77.39
MW-15 2/26/2003 88.82 --0.00 9.04 --79.78
MW-15 5/15/2003 88.82 --0.00 8.79 --80.03
MW-15 8/14/2003 88.82 --0.00 12.09 --76.73
MW-15 11/5/2003 88.82 --0.00 9.55 --79.27
MW-15 5/5/2004 88.82 --0.00 10.77 --78.05
MW-15 11/18/2004 88.82 --0.00 13.32 --75.50
MW-15 4/29/2008 88.82 --0.00 8.84 --79.98
MW-15 4/21/2009 88.82 --0.00 8.43 --80.39
MW-15 4/27/2010 88.82 --0.00 9.11 --79.71
MW-15 4/18/2011 88.82 --0.00 9.64 --79.18
MW-15 4/10/2012 88.82 --0.00 10.05 --78.77
MW-15 4/16/2013 88.82 --0.00 9.50 --79.32
MW-15 4/28/2014 88.82 --0.00 7.48 --81.34
0
MW-16 7/29/1998 87.05 --0.00 9.78 --77.27
MW-16 3/15/2000 87.05 --0.00 8.76 --78.29
MW-16 12/10/2001 87.05 --0.00 12.28 --74.77
MW-16 5/14/2002 87.05 --0.00 10.83 --76.22
MW-16 8/29/2002 87.05 --0.00 14.33 --72.72
MW-16 11/11/2002 87.05 --0.00 9.94 --77.11
MW-16 2/26/2003 87.05 --0.00 7.44 --79.61
MW-16 5/15/2003 87.05 --0.00 7.01 --80.04
MW-16 8/14/2003 87.05 --0.00 6.51 --80.54
MW-16 11/5/2003 87.05 --0.00 7.99 --79.06
MW-16 5/5/2004 86.97 --0.00 7.73 --79.24
MW-16 11/18/2004 86.97 --0.00 8.14 --78.83
MW-16 4/29/2008 86.97 --0.00 4.71 --82.26
MW-16 4/21/2009 86.97 --0.00 2.71 --84.26
Well destroyed during construction activities in 2005
Page 5 of 10
WELL
NUMBER DATE (ft)(ft)
FP THICKNESS
(ft)(ft)
CORRECTED
DTW (ft)(ft)
SUMMARY OF HISTORICAL GROUNDWATER ELEVATION DATA
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
MW-16 4/27/2010 86.97 --0.00 5.39 --81.58
MW-16 4/18/2011 86.97 --0.00 3.77 --83.20
MW-16 4/10/2012 86.97 --0.00 4.02 --82.95
MW-16 4/16/2013 86.97 --0.00 3.91 --83.06
MW-16 4/28/2014 86.97 --0.00 3.87 --83.10
MW-17 7/29/1998 91.83 --0.00 13.86 --77.97
MW-17 3/15/2000 91.83 12.24 0.33 12.57 12.33 79.50
MW-17 12/10/2001 91.83 NM NM NM NM NM
MW-17 5/14/2002 91.83 12.60 0.02 12.62 12.61 79.22
MW-17 8/29/2002 91.83 DRY DRY DRY DRY DRY
MW-17 11/11/2002 91.83 --0.00 15.21 --76.62
MW-17 2/26/2003 91.83 --0.00 13.10 --78.73
MW-17 5/15/2003 91.83 --0.00 11.76 --80.07
MW-17 8/15/2003 91.83 --0.00 12.72 --79.11
MW-17 11/5/2003 91.83 --0.00 12.42 --79.41
MW-17 5/5/2004 91.83 --0.00 13.31 --78.52
MW-17 11/18/2004 91.83 --0.00 13.53 --78.30
0
MW-18 3/15/2000 95.56 --0.00 10.68 --84.88
MW-18 12/10/2001 95.56 --0.00 15.69 --79.87
MW-18 5/14/2002 95.56 --0.00 14.33 --81.23
MW-18 8/29/2002 95.56 --0.00 17.10 --78.46
MW-18 11/11/2002 95.56 --0.00 13.45 --82.11
MW-18 2/26/2003 95.56 --0.00 11.28 --84.28
MW-18 5/15/2003 95.56 --0.00 9.05 --86.51
MW-18 8/14/2003 95.56 --0.00 7.53 --88.03
MW-18 11/5/2003 95.56 --0.00 9.56 --86.00
MW-18 5/5/2004 95.56 --0.00 11.28 --84.28
MW-18 11/18/2004 95.56 --0.00 11.06 --84.50
MW-18 4/29/2008 95.56 --0.00 11.73 --83.83
MW-18 4/21/2009 95.56 --0.00 10.23 --85.33
MW-18 4/27/2010 95.56 --0.00 9.60 --85.96
MW-18 4/18/2011 95.56 --0.00 11.22 --84.34
MW-18 4/10/2012 95.56 --0.00 11.60 --83.96
MW-18 4/16/2013 95.56 --0.00 10.83 --84.73
MW-18 4/28/2014 95.56 --0.00 8.05 --87.51
0
MW-19 3/15/2000 90.10 --0.00 11.11 --78.99
MW-19 12/10/2001 90.10 --0.00 15.06 --75.04
MW-19 5/14/2002 90.10 --0.00 13.76 --76.34
MW-19 8/29/2002 90.10 --0.00 16.85 --73.25
MW-19 11/11/2002 90.10 --0.00 12.98 --77.12
MW-19 2/26/2003 90.10 --0.00 10.84 --79.26
MW-19 5/15/2003 90.10 --0.00 10.17 --79.93
MW-19 8/14/2003 90.10 --0.00 10.19 --79.91
MW-19 11/5/2003 90.10 --0.00 10.99 --79.11
MW-19 5/5/2004 90.10 --0.00 11.82 --78.28
MW-19 11/18/2004 90.10 --0.00 11.77 --78.33
MW-19 4/29/2008 90.10 --0.00 11.31 --78.79
MW-19 4/21/2009 90.10 --0.00 10.31 --79.79
MW-19 4/27/2010 90.10 --0.00 10.61 --79.49
MW-19 4/18/2011 90.10 --0.00 11.34 --78.76
MW-19 4/10/2012 90.10 --0.00 11.57 --78.53
Well destroyed during construction activities in 2005
Page 6 of 10
WELL
NUMBER DATE (ft)(ft)
FP THICKNESS
(ft)(ft)
CORRECTED
DTW (ft)(ft)
SUMMARY OF HISTORICAL GROUNDWATER ELEVATION DATA
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
MW-19 4/16/2013 90.10 --0.00 11.02 --79.08
MW-19 4/28/2014 90.10 9.33 0.28 9.61 9.41 80.69
0
MW-20 4/4/2003 86.02 --0.00 5.94 --80.08
MW-20 5/15/2003 86.02 --0.00 6.70 --79.32
MW-20 8/14/2003 86.02 --0.00 6.15 --79.87
MW-20 11/5/2003 86.02 --0.00 7.32 --78.70
MW-20 5/5/2004 86.02 --0.00 8.05 --77.97
MW-20 11/18/2004 86.02 --0.00 7.91 --78.11
MW-21 4/4/2003 89.31 --0.00 9.21 --80.10
MW-21 5/15/2003 89.31 --0.00 9.82 --79.49
MW-21 8/14/2003 89.31 --0.00 9.36 --79.95
MW-21 11/5/2003 89.31 --0.00 10.39 --78.92
MW-21 5/5/2004 89.31 --0.00 11.10 --78.21
MW-21 11/18/2004 89.31 --0.00 11.02 --78.29
MW-21 4/29/2008 89.31 10.71 0.08 10.79 10.73 78.58
MW-21 4/21/2009 89.31
MW-21 4/27/2010 89.31 10.34 0.02 10.36 10.35 78.96
MW-21 4/18/2011 89.31 10.34 0.47 10.81 10.47 78.84
MW-21 4/10/2012 89.31 10.99 0.07 11.06 11.01 78.30
MW-21 4/16/2013 89.31 10.59 0.04 10.63 10.60 78.71
MW-21 4/29/2014 89.31 --0.00 9.03 --80.28
0
MW-22 4/4/2003 89.66 --0.00 7.38 --82.28
MW-22 5/15/2003 89.66 --0.00 8.53 --81.13
MW-22 8/14/2003 89.66 --0.00 7.83 --81.83
MW-22 11/5/2003 89.66 --0.00 9.07 --80.59
MW-22 5/5/2004 89.66 --0.00 10.38 --79.28
MW-22 11/18/2004 89.66 --0.00 10.00 --79.66
MW-22 4/29/2008 89.66 --0.00 6.51 --83.15
MW-22 4/21/2009 89.66 --0.00 8.46 --81.20
MW-22 4/27/2010 89.66 --0.00 8.84 --80.82
MW-22 4/18/2011 89.66 --0.00 9.41 --80.25
MW-22 4/10/2012 89.66 --0.00 9.91 --79.75
MW-22 4/16/2013 89.66 --0.00 9.29 --80.37
MW-22 4/28/2014 89.66 --0.00 7.14 --82.52
0
MW-23 4/4/2003 85.97 --0.00 6.04 --79.93
MW-23 5/15/2003 85.97 --0.00 7.06 --78.91
MW-23 8/14/2003 85.97 --0.00 6.05 --79.92
MW-23 11/5/2003 85.97 --0.00 7.86 --78.11
MW-23 5/5/2004 85.97 --0.00 8.24 --77.73
MW-23 11/18/2004 85.97 --0.00 8.28 --77.69
MW-23 4/29/2008 85.97 8.30 0.18 8.48 8.35 77.62
MW-23 4/21/2009 85.97
MW-23 4/27/2010 85.97 --0.00 7.49 --78.48
MW-23 4/18/2011 85.97 --0.00 8.31 --77.66
MW-23 4/10/2012 85.97 8.14 0.65 8.79 8.32 77.65
MW-23 4/16/2013 85.97 --0.00 7.81 --78.16
MW-23 4/28/2014 85.97 --0.00 6.21 --79.76
0
MW-24 4/4/2003 87.52 --0.00 7.63 --79.89
MW-24 5/15/2003 87.52 --0.00 8.24 --79.28
MW-24 8/14/2003 87.52 --0.00 7.49 --80.03
Well covered by concrete slab
Free Product Absorbent Socks Currently in Well
Free Product Absorbent Socks Currently in Well
Page 7 of 10
WELL
NUMBER DATE (ft)(ft)
FP THICKNESS
(ft)(ft)
CORRECTED
DTW (ft)(ft)
SUMMARY OF HISTORICAL GROUNDWATER ELEVATION DATA
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
MW-24 11/5/2003 87.52 --0.00 8.86 --78.66
MW-24 5/5/2004 87.52 --0.00 9.47 --78.05
MW-24 11/18/2004 87.52 --0.00 9.37 --78.15
MW-24 4/29/2008 87.52 9.10 0.19 9.29 9.15 78.37
MW-24 4/21/2009 87.52
MW-24 4/27/2010 87.52 --0.00 8.64 --78.88
MW-24 4/18/2011 87.52 --0.00 9.20 --78.32
MW-24 4/10/2012 87.52 9.33 0.36 9.69 9.43 78.09
MW-24 4/16/2013 87.52 --0.00 9.01 --78.51
MW-24 4/28/2014 87.52 --0.00 7.41 --80.11
MW-25 5/5/2004 85.15 --0.00 8.45 --76.70
MW-25 11/18/2004 85.15 --0.00 8.13 --77.02
MW-25 4/30/2008 85.15 --0.00 4.11 --81.04
MW-25 4/21/2009 85.15 --0.00 7.13 --78.02
MW-25 4/27/2010 85.15 --0.00 7.87 --77.28
MW-25 4/18/2011 85.15 --0.00 8.32 --76.83
MW-25 4/10/2012 85.15 --0.00 8.57 --76.58
MW-25 4/16/2013 85.15 --0.00 8.12 --77.03
MW-25 4/29/2014 85.15 --0.00 6.70 --78.45
MW-26 5/5/2004 78.56 --0.00 3.20 --75.36
MW-26 11/18/2004 78.56 --0.00 3.15 --75.41
MW-26 4/30/2008 78.56 --0.00 2.84 --75.72
MW-26 4/21/2009 78.56 --0.00 2.40 --76.16
MW-26 4/27/2010 78.56 --0.00 3.00 --75.56
MW-26 4/18/2011 78.56 --0.00 3.18 --75.38
MW-26 4/10/2012 78.56 --0.00 3.37 --75.19
MW-26 4/16/2013 78.56 --0.00 3.14 --75.42
MW-26 4/29/2014 78.56 --0.00 2.20 --76.36
MW-27 5/5/2004 87.88 --0.00 9.83 --78.05
MW-27 11/18/2004 87.88 --0.00 9.75 --78.13
MW-27 4/30/2008 87.88 --0.00 9.47 --78.41
MW-27 4/22/2009 87.88 --0.00 8.63 --79.25
MW-27 4/27/2010 87.88 --0.00 8.94 --78.94
MW-27 4/18/2011 87.88 --0.00 9.56 --78.32
MW-27 4/10/2012 87.89 --0.00 9.81 --78.08
MW-27 4/16/2013 87.89 --0.00 9.36 --78.53
MW-27 4/29/2014 87.89 --0.00 7.82 --80.07
MW-28 5/5/2004 88.61 --0.00 11.52 --77.09
MW-28 11/18/2004 88.61 --0.00 11.47 --77.14
MW-28 4/30/2008 88.61 --0.00 11.11 --77.50
MW-28 4/21/2009 88.61 --0.00 10.20 --78.41
MW-28 4/27/2010 88.61 --0.00 10.73 --77.88
MW-28 4/18/2011 88.61 --0.00 11.33 --77.28
MW-28 4/10/2012 88.61 --0.00 11.56 --77.05
MW-28 4/16/2013 88.61 --0.00 11.11 --77.50
MW-28 4/28/2014 88.61 --0.00 9.50 --79.11
MW-29 4/21/2009 92.47 --0.00 12.54 --79.93
MW-29 4/27/2010 92.47 --0.00 12.97 --79.50
MW-29 4/18/2011 92.47 --0.00 13.68 --78.79
MW-29 4/10/2012 92.47 --0.00 13.86 --78.61
Free Product Absorbent Socks Currently in Well
Page 8 of 10
WELL
NUMBER DATE (ft)(ft)
FP THICKNESS
(ft)(ft)
CORRECTED
DTW (ft)(ft)
SUMMARY OF HISTORICAL GROUNDWATER ELEVATION DATA
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
MW-29 4/16/2013 92.47 --0.00 13.40 --79.07
MW-29 4/28/2014 92.47 --0.00 11.75 --80.72
MW-30 4/27/2010 90.23 --0.00 11.14 --79.09
MW-30 4/18/2011 90.23 --0.00 11.71 --78.52
MW-30 4/10/2012 90.23 --0.00 11.91 --78.32
MW-30 4/16/2013 90.23 --0.00 11.49 --78.74
MW-30 4/29/2014 90.23 --0.00 9.94 --80.29
MWWB-1 12/10/2001 79.02 --0.00 6.00 --73.02
MWWB-1 5/14/2002 79.02 --0.00 5.01 --74.01
MWWB-1 8/29/2002 79.02 --0.00 7.34 --71.68
MWWB-1 11/11/2002 79.02 --0.00 4.51 --74.51
MWWB-1 2/26/2003 79.02 --0.00 3.25 --75.77
MWWB-1 5/15/2003 79.02 --0.00 3.43 --75.59
MWWB-1 8/15/2003 79.02 --0.00 2.69 --76.33
MWWB-1 11/5/2003 79.02 --0.00 3.62 --75.40
MWWB-1 5/5/2004 79.02 --0.00 3.66 --75.36
MWWB-1 11/18/2004 79.02 --0.00 3.86 --75.16
MWWB-1 4/29/2008 79.02 --0.00 3.83 --75.19
MWWB-1 4/21/2009 79.02 --0.00 3.46 --75.56
MWWB-1 4/27/2010 79.02 --0.00 4.02 --75.00
MWWB-1 4/18/2011 79.02 --0.00 4.11 --74.91
MWWB-1 4/11/2012 79.02 --0.00 4.35 --74.67
MWWB-1 4/16/2013 79.02 --0.00 4.06 --74.96
MWWB-1 4/29/2014 79.02 --0.00 3.46 --75.56
MWWB-2 12/10/2001 85.07 --0.00 10.41 --74.66
MWWB-2 5/14/2002 85.07 --0.00 9.31 --75.76
MWWB-2 8/29/2002 85.07 --0.00 11.83 --73.24
MWWB-2 11/11/2002 85.07 --0.00 8.64 --76.43
MWWB-2 2/26/2003 85.07 --0.00 6.64 --78.43
MWWB-2 5/15/2003 85.07 --0.00 6.64 --78.43
MWWB-2 8/15/2003 85.07 --0.00 5.88 --79.19
MWWB-2 11/5/2003 85.07 --0.00 7.04 --78.03
MWWB-2 5/5/2004 85.07 --0.00 7.28 --77.79
MWWB-2 11/18/2004 85.07 --0.00 7.37 --77.70
MWWB-2 4/29/2008 85.07 --0.00 7.09 --77.98
MWWB-2 4/22/2009 85.07 --0.00 6.62 --78.45
MWWB-2 4/27/2010 85.07 --0.00 7.21 --77.86
MWWB-2 4/18/2011 85.07 --0.00 7.69 --77.38
MWWB-2 4/10/2012 85.07 --0.00 7.59 --77.48
MWWB-2 4/16/2013 85.07 --0.00 7.30 --77.77
MWWB-2 4/29/2014 85.07 --0.00 6.07 --79.00
0
MWWB-3 12/10/2001 83.29 --0.00 9.97 --73.32
MWWB-3 5/14/2002 83.29 --0.00 8.81 --74.48
MWWB-3 8/29/2002 83.29 --0.00 11.33 --71.96
MWWB-3 11/11/2002 83.29 --0.00 8.17 --75.12
MWWB-3 2/26/2003 83.29 --0.00 6.48 --76.81
MWWB-3 5/15/2003 83.29 --0.00 6.51 --76.78
MWWB-3 8/15/2003 83.29 --0.00 5.67 --77.62
MWWB-3 11/5/2003 83.29 --0.00 7.00 --76.29
MWWB-3 5/5/2004 83.29 --0.00 7.46 --75.83
MWWB-3 11/18/2004 83.29 --0.00 7.31 --75.98
Page 9 of 10
WELL
NUMBER DATE (ft)(ft)
FP THICKNESS
(ft)(ft)
CORRECTED
DTW (ft)(ft)
SUMMARY OF HISTORICAL GROUNDWATER ELEVATION DATA
WILCO STATION #175
BURLINGTON, NORTH CAROLINA
INCIDENT NO. 19272
MID-ATLANTIC JOB NO. 097R0583.79
MWWB-3 4/29/2008 83.29 --0.00 7.03 --76.26
MWWB-3 4/22/2009 83.29 --0.00 6.71 --76.58
MWWB-3 4/27/2010 83.29 --0.00 7.07 --76.22
MWWB-3 4/18/2011 83.29 --0.00 7.44 --75.85
MWWB-3 4/10/2012 83.29 --0.00 7.56 --75.73
MWWB-3 4/16/2013 83.29 --0.00 7.26 --76.03
MWWB-3 4/29/2014 83.29 --0.00 6.21 --77.08
0
MWWB-4 12/10/2001 84.27 --0.00 10.63 --73.64
MWWB-4 5/14/2002 84.27 --0.00 9.29 --74.98
MWWB-4 8/29/2002 84.27 --0.00 12.41 --71.86
MWWB-4 11/11/2002 84.27 --0.00 8.70 --75.57
MWWB-4 2/26/2003 84.27 --0.00 6.70 --77.57
MWWB-4 5/15/2003 84.27 --0.00 6.65 --77.62
MWWB-4 8/15/2003 84.27 --0.00 5.76 --78.51
MWWB-4 11/5/2003 84.27 --0.00 7.27 --77.00
MWWB-4 5/5/2004 84.27 --0.00 7.93 --76.34
MWWB-4 11/18/2004 84.27 --0.00 7.55 --76.72
MWWB-4 4/29/2008 84.27 --0.00 6.96 --77.31
MWWB-4 4/22/2009 84.27 --0.00 6.61 --77.66
MWWB-4 4/27/2010 84.27 --0.00 7.08 --77.19
MWWB-4 4/18/2011 84.27 --0.00 7.42 --76.85
MWWB-4 4/10/2012 84.27 --0.00 7.76 --76.51
MWWB-4 4/16/2013 84.27 --0.00 7.27 --77.00
MWWB-4 4/29/2014 84.27 --0.00 5.91 --78.36
Notes:
Shaded cells indicate that the water level has been corrected for the presence of free product (see next page)
Measuring point is top of well (TOC) casing unless otherwise noted.
MW-16 manhole was replaced and re-surveyed in May 2004
NM - Not Measured
DTP - Depth-to-Free Product in feet
FP - Free Product in feet
SWLE - Static Water Elevation in feet
All elevations based on relative elevation to SW concrete pedestal of the Wilco sign - Assumed datum 100.00 feet
Page 10 of 10
WATER LEVEL CORRECTION CALCULATION FOR WELL WITH FREE PRODUCT
The static water level is corrected for the weight of the overlying free product using the following calculation:
GASOLINE AND DIESEL
Corrected Depth to Water (CDTW) = DTW - (Gp X APT)
where:
DTW = depth to water (as measured)
Gp = specific gravity of gasoline = 0.73
APT = apparent free product thickness (as measured)
As an example, for MW-19 on 9/18/13, the following calculation is made for gasoline free product:
CDTW = 11.40 - (0.73 X 0.05 ft)
= 11.36
Static water level therefore equals 100.00 - 24.28 = 75.72
This formula is embedded in the Groundwater Elevation Data table when appropriate
TABLE 4.2 ADDENDUM

APPENDIX A

SELECTED HISTORICAL SITE INFORMATION

APPENDIX B

MONITORING WELL CONSTRUCTION RECORDS –
MW-19, MW-23 AND MW-30

APPENDIX C

ADVANCED ENVIRONMENTAL’S “MOBILE
MULTIPHASE EXTRACTION REPORTS”

APPENDIX D

MID-ATLANTIC FIELD PROCEDURES

APPENDIX E

LABORATORY ANALYTICAL REPORT AND
CHAIN-OF-CUSTODY RECORD FOR
GROUNDWATER SAMPLES