WA-855_11512_CA_RPTS_20190416_RMR

GROUNDWATER MONITORING
REPORT
AINSLEY'S SERVICE CENTER
203 US HIGHWAY 64
CRESWELL, WASHINGTON COUNTY
UST INCIDENT #: 11512
RISK CLASSIFICATION: HIGH (1900)
Latitude: N 35.8724
Longitude: W -76.3927
PREPARED FOR
Mr. Bryan Ainsley
2557 Newlands Road
Columbia, North Carolina 27925
Telephone: [phone]
PREPARED BY:
Groundwater Management Associates, Inc.
(Hydrogeology)
4300 Sapphire Court, Suite 100
Greenville, North Carolina 27834
Telephone: [phone]
(Engineering)
2205 Candun Drive, Suite A
Apex, North Carolina 27523
Telephone: [phone]
North Carolina Corporate Engineering License #: C-0854
North Carolina Corporate Geology License #: C-121
April 16, 2019
April 16, 2019
Ms. Sylvia Hunneke
NCDEQ, DWM, UST Section
Washington Regional Office
943 Washington Square Mall
Washington, North Carolina 27889
Re: Groundwater Monitoring Report
Groundwater Management Associates, Inc.
4300 Sapphire Court, Suite 100
Greenville, North Carolina 27834
Telephone: [phone]
www.qma-nc.com
Ainsley's Service Center, 203 US Highway 64, Creswell, Washington County, North Carolina
UST Incident Number: 11512 Risk Classification: High (H190D)
Dear Ms. Hunneke:
Enclosed is one copy of a Groundwater Monitoring Report, prepared by Groundwater Management
Associates, Inc., on behalf of Mr. Bryan Ainsley for the above referenced site. If you have any
questions or comments about the enclosed report, please do not hesitate to contact me at (252) 758-
3310. Thank you.
Sincerely,
Groundwater Management Associates, Inc.
Samantha Kofroth
Staff Hydrogeologist
Enclosure: Groundwater Monitoring Report
cc: Mr. Bryan Ainsley, owner
Katie T. Hackney, P.G. GMA-Greenville
Z:\GMA\111601-Ainsley Service Center\Mon Rpts\Mon Rpt-32019\Letter-032019.docx
The Groundwater Experts

TABLE OF CONTENTS
Page
1.0 SITE INFORMATION .............................................................................................. 1
1.1 Site Identification ........................................................................................... 1
1.2 Contact Information ........................................................................................ 1
1.3 Release Information ........................................................................................ 1
1.4 Report Certification ......................................................................................... 2
2.0 INTRODUCTION AND SITE HISTORY .................................................................... 2
3.0 POTENTIAL RECEPTORS ........................................................................................ 3
4.0 PUBLIC WATER SUPPLY SAMPLING AND TESTING .............................................. 3
5.0 SURFACE WATER SAMPLING AND TESTING ......................................................... 4
6.0 FREE PRODUCT RECOVERY ................................................................................... 4
7.0 GROUNDWATER INVESTIGATION ........................................................................ 5
7.1 Water Level Measurements and Hydraulic Gradients .......................................... 5
7.2 Groundwater Sample Collection and Analytical Methods ..................................... 5
7.3 Groundwater Contaminant Analytical Data ........................................................ 5
8.0 SUMMARY .............................................................................................................. 6
9.0 RECOMMENDATIONS ............................................................................................ 7
10.0 REFERENCES CITED ............................................................................................... 7

LIST OF FIGURES
1. Topographic Map (USGS 7.5 Minute Series, Creswell Quadrangle, Washington Co., NC)
2. Properties and Water-Supply Wells Within 1500 Feet of the Site
3. Location of Monitoring Wells and Surface Water Samples
4. Equipotential Map, 3/20/2019
5. Benzene Plume Map, 3/20/2019
6. MTBE Plume Map, 3/20/2019
7. Digital Elevation Model

LIST OF TABLES
1. List of Adjacent Properties and Properties with Water-Supply Wells Within 1500 Feet of
the Site
2. Summary of Surface Water Sampling Analytical Results
3. Well Construction and Water Level Measurements
4. Summary of Monitoring Well Sampling Analytical Results

LIST OF APPENDICES
I. NCDEQ Correspondence
II. Technical Methods and Standard Procedures
III. Copy of Laboratory Report and Chain-of-Custody Records
GROUNDWATER MONITORING REPORT

1.0 SITE INFORMATION

1.1 SITE IDENTIFICATION
Date of Report: April 16, 2019
Facility I.D.: 0-005657 UST Incident Number: 11512
Site Name: Ainsley’s Service Center Site Location: 203 US Highway 64
Nearest City/Town: Creswell ZIP: 27928 County: Washington
Risk Classification: High Ranking: 190 D Land Use: Residential
Latitude: N 35.8724 Longitude: W -76.3927

1.2 CONTACT INFORMATION
UST Owner/Operator: Mr. Bryan Ainsley
Address: 2557 Newlands Road, Columbia, North Carolina 27925
Phone: [phone]

Property Owner: Mr. Bryan Ainsley
Address: 2557 Newlands Road, Columbia, North Carolina 27925
Phone: [phone]

Property Occupant: Mr. Scott Patrick, Patrick’s Auto
Address: 203 Old Highway 64, Creswell, North Carolina 27928
Phone: [phone]

Consultant/Contractor: Groundwater Management Associates, Inc. (GMA)
Address: 4300 Sapphire Court, Suite 100, Greenville, North Carolina 27983
Phone: [phone]

Analytical Laboratory: Prism Laboratories, Inc. State Certification #: 402
Address: 449 Springbrook Road, P.O. Box 240543, Charlotte, North Carolina 28224-0543
Phone: [phone]

1.3 RELEASE INFORMATION
Date Discovered: On December 30, 1993, four underground storage tanks (USTs) were
removed from Ainsley’s Service Center (Figures 1 and 2) in Creswell, Washington County.
Reportedly, 265 cubic yards of soil were excavated from beneath the tanks, and groundwater
was encountered within the excavation (Landmark, 2002). Soil samples were collected from
beneath the tanks and analytical results confirmed the presence of total petroleum
hydrocarbons (TPH) exceeding the 10 milligrams per kilogram (mg/kg) Reportable
Concentration for soil (CES, 1994).
Groundwater Monitoring Report
Ainsley's Service Center (UST Incident #: 11512)
April 16, 20 19 Page 2 of 8
Estimated Quantity of Release: The quantity of the petroleum release is not known.
Cause of Release: The cause of the release is assumed to be deterioration of the former
USTs, and associated dispenser islands and piping.
Source of Release (e.g" Pipingj UST): The former USTs and dispenser islands appear to be
the source of the release.
Sizes and contents of UST system(s) from which the release occurred: Ainsley's
Service Center previously maintained two 4000-gallon gasoline USTs, one SOOO-galion gasoline
UST, and one 2000-gallon diesel UST. Tank closure procedures were completed on December
30, 1993. Reportedly, two 10,OOO-galion gasoline USTs were installed at the site in November
of 1993 to replace the older USTs. Ainsley's Service Center reportedly stopped selling gasoline
in 2005 and the two 10,000 gallon USTs were emptied at approximately the same time (GMA,
2008).
1.4 REPORT CERTIFICATION
I, Katie T. Hackney, a Licensed Geologist for Groundwater Management Associates, Inc. (GMA),
do certify that the information contained in this report is correct and accurate to the best of my
knowledge. GMA is a professional corporation licensed to practice geology (Greenville & Apex,
NC #C-121) and engineering (Apex, NC #,~;,~nCl;A~rJn,,~~,e state of North Carolina. ~
", ,..\ R '" ~~ry . ~$~;'.~~:E:'N·S~(j·~~}"'~ J2 ~ ~ . ~O'~ \~~ . . --. l L ). {~l#1 SEAL \\;Y: \ WntL .
. -~I 2101 ()~:w::
Katie T. Hackney, P.G. \~S ~~ ./ ~ J Samantha Kofroth .. ~\ Q ~,. CJ ... Senior Hydrogeologist '\ ~··" ... fOLOG~;"<~~/ Staff Hydrogeologist ~ '/tI~ I ................. ~ ~ ... ...
"""1 rARLE,10\ \.,\,\""
2.0 INTRODUCTION AND SITE HISt~RiY.II''''''''
On December 30, 1993, four USTs were removed from Ainsley's Service Center (Figures 1 and
2) in Creswell, Washington County. Soil samples were collected from beneath the tanks during
closure activities, and analytical results confirmed the presence of TPH exceeding the 10 mg/kg
Reportable Concentration for soil (CES, 1994).
A Comprehensive Site Assessment (CSA) was prepared in March of 1995 (CES, 1995a) and a
CSA Addendum in July of 1995 (CES, 1995b). An initial Corrective Action Plan (CAP) was
prepared in November of 1995 (ENSCI, 1995), followed by two CAP Addendums in February of
1996 (ENSCI, 1996) and July of 1996 (Triangle, 1996), respectively. The CAP was approved by
the North Carolina Department of Environment and Natural Resources, predecessor of the North
Carolina Department of Environmental Quality (NCDEQ), in September of 1996. A remediation
system pilot test was performed in March of 2002 (Landmark, 2002), and approved by NCDEQ
in October of 2002. A remediation system consisting of groundwater pump-and-treat (P& T)
Groundwater Monitoring Report
Ainsley’s Service Center (UST Incident #: 11512)
April 16, 2019 Page 3 of 8
and soil vapor extraction (SVE) technologies was installed and activated in June of 2003. A
total of 616,926 gallons of petroleum-contaminated groundwater was reportedly recovered and
treated by the remediation system through June of 2005 (CES, 2005). The date that the P&T
and SVE system was shut down and removed from the site is unknown.

Assessment and remedial efforts at the site were suspended by NCDEQ in September of 2005,
but the incident was reactivated in September of 2007. Groundwater Management Associates,
Inc. (GMA), completed a sensitive receptor survey, performed three aggressive fluid-vapor
recovery (AFVR) events, deployed absorbent socks to recover free product, expanded the
monitoring-well network, delineated the extent of soil contamination, and conducted 13
groundwater monitoring events since reactivation of the incident. As requested in the Notice of
Regulatory Requirements dated December 14, 2018, and e-mail correspondence from NCDEQ,
GMA has performed a limited groundwater monitoring event (Appendix I). The remainder of
this report summarizes the completion of the groundwater monitoring event conducted on
March 20, 2019.

3.0 POTENTIAL RECEPTORS
In 2008, GMA performed a sensitive receptor survey update by investigating all properties
within 1500 feet of the source area (Figure 2). Two inactive water-supply wells were identified
within 500 feet of the source area. Two active municipal water-supply wells, one active non-
potable well, one inactive well, and one well of unknown status were identified between 500
and 1000 feet from the source area. The two municipal wells serving the Town of Creswell
(PWSID 04-94-020) are located approximately 930 feet southeast (WSW2) and 975 feet
southeast (WSW1) of the source area (Table 1). The source area lies within the designated
wellhead protection area for the two municipal wells (Figures 1 and 2). Municipal wells WSW1
and WSW2 are screened within the Yorktown Aquifer from 89 to 119 feet and from 90 to 110
feet below land surface (BLS), respectively (GMA, 2008).

An intermittent drainage ditch is located approximately 125 feet south of the source area, along
the southern property boundary of the site (Figure 3). This drainage ditch connects to a
channelized tributary of the Scuppernong River (Figures 1, 2, and 3).

4.0 PUBLIC WATER SUPPLY SAMPLING AND TESTING
On December 15, 2015, GMA collected water samples from the public water-supply system at
the Ainsley’s Service Center shop (PWS203) and the neighboring Washington County property
(PWS207) and the residential property owned by Dr. Charles Payne Jr. (PWS211) to investigate
if the dissolved petroleum contaminants had impacted the water-supply lines on those
properties. The samples were submitted to a North Carolina certified laboratory, Prism
Laboratories, Inc. (Prism) for analysis of volatile organic compounds (VOCs) by EPA Method
6200B. None of the targeted petroleum-related VOCs were detected in the three samples
(GMA, 2016a).

Groundwater Monitoring Report
Ainsley’s Service Center (UST Incident #: 11512)
April 16, 2019 Page 4 of 8
Each of the public-water supply samples contained a detectable concentration of three or more
of the following; bromodichloromethane, bromoform, chloroform, and dibromochloromethane
(GMA, 2016a). These four compounds make up the group collectively known as
trihalomethanes (THMs) and are formed when disinfectants are used to control microbial
contaminants in drinking water. The United States Environmental Protection Agency’s (EPA’s)
primary drinking water standard for total THMs is 80 micrograms per liter (µg/L; EPA, 2011).
The total concentration of THMs in each of the three samples was less than 80 µg/L.

5.0 SURFACE WATER SAMPLING AND TESTING
An intermittent drainage ditch is located along the southern property line of the site, south of
monitoring wells MW11, MW13, MW22, MW27, and MW30, and north of monitoring wells
MW15, MW24, and MW25 (Figure 3). In February of 2009, GMA measured the elevation of the
bottom of the ditch south of monitoring wells MW11 and MW18 relative to the monitoring-well
network. The water levels in nearby monitoring wells MW11, MW13, MW22, MW24, and MW25
during recent and previous groundwater monitoring events indicated the water table was above
the bottom of the ditch and groundwater was discharging to the ditch.

On March 15, 2018, GMA collected surface water samples from the intermittent drainage ditch
located along the southern property boundary of the site and the channelized tributary the
intermittent drainage ditch discharges into to investigate if the petroleum-contaminated
groundwater is discharging to surface waters. A total of three surface water samples were
collected in areas upgradient (SW1), within (SW2), and downgradient (SW3) of the area where
the petroleum-contaminated groundwater is anticipated to discharge to the ditch. Surface
water sample SW3 was collected at the confluence of the channelized tributary and intermittent
drainage ditch (Figure 3).

Methyl tert-butyl ether (MTBE) was detected in surface water sample SW3, but the
concentrations did not exceed either 15A NCAC 2B surface water standard (690 µg/L) or the
15A NCAC 2L groundwater standard (20 µg/L; Table 2). Table 2 summarizes results from
previous surface water sampling events.

GMA did not collect surface water samples during the March 20, 2019 sampling event.

6.0 FREE PRODUCT RECOVERY
On January 24, 1995, liquid-phase gasoline (free product) was first discovered at the site in
monitoring well MW3. Monitoring well MW1 contained free product on May 17 and December
21, 2004, but none has been detected since. Well RW3 contained free product on September
5, 2002, but none has been detected since. Six AFVR events have been conducted on
monitoring well MW3 since 2001, and totals of approximately 9.78 gallons of liquid and vapor-
equivalent gasoline and 15,693 gallons of contaminated groundwater were recovered (GMA,
2011).

Groundwater Monitoring Report
Ainsley’s Service Center (UST Incident #: 11512)
April 16, 2019 Page 5 of 8
On February 24, 2012, GMA deployed absorbent socks in monitoring well MW3 to recover free
product, and a total of 4.68 gallons (~25.43 pounds) of free product has been recovered
through September 29, 2016. A combined total of approximately 14.5 gallons of gasoline
(including vapor equivalent) have been recovered by absorbent sock deployment and
maintenance and the six AFVR events (GMA, 2017). Free product measurement tables and
figures can be found in GMA’s Remediation Monitoring Report dated July 5, 2017 (GMA, 2017).

7.0 GROUNDWATER INVESTIGATION
7.1 WATER-LEVEL MEASUREMENTS AND HYDRAULIC GRADIENTS
On March 20, 2019, GMA collected water-level measurements (Table 3) from thirteen wells
(MW1, MW3, MW5, MW7, MW9, MW10, MW11, MW12, MW14, MW16, MW18, MW30 and
RW4). The average depth to groundwater near the former UST basin was approximately 2.8
feet below land surface (BLS). The equipotential map (Figure 4) indicates that the horizontal
component of groundwater flow was directed toward the west-southwest along an average
horizontal hydraulic gradient of approximately 0.003 feet per foot (ft/ft). GMA calculated a
downward-directed vertical hydraulic gradient of 0.001 ft/ft, using water level data from
monitoring wells MW11 and MW18.

7.2 GROUNDWATER SAMPLE COLLECTION AND ANALYTICAL METHODS
On March 20, 2019, GMA collected groundwater samples from thirteen wells (MW1, MW3,
MW5, MW7, MW9, MW10, MW11, MW12, MW14, MW16, MW18, MW30 and RW4). GMA could
not locate monitoring well MW13, as the site occupants have placed an old truck over the well.
GMA could not collect a sample monitoring well MW15. This well was last sampled in July of
2012, the property owner was not home to grant permission for GMA to access the well. GMA
submitted the samples to Prism for analysis of VOCs by EPA Method 6200B. Sample collection,
storage, and transportation methods complied with state recommendations (NCDWM, 2013)
and GMA’s standard practices (Appendix II).

7.3 GROUNDWATER CONTAMINANT ANALYTICAL DATA
Table 4 summarizes new and historical groundwater analytical results. A copy of the laboratory
report and chain-of-custody forms for the groundwater samples collected on March 20, 2019
are provided in Appendix III.

Seven of the thirteen samples contained at least one petroleum-related contaminant at a
concentration greater than the 15A NCAC 2L groundwater standard, including benzene, toluene,
ethylbenzene, total xylenes, MTBE, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene,
naphthalene, n-propylbenzene, isopropyl-benzene and n-butyl-benzene (Table 4). Gross
Contaminant Levels (GCLs) were not detected in any of the groundwater samples.

GMA prepared isoconcentration maps for the March 20, 2019 sampling event. Isoconcentration
maps of benzene and MTBE are provided as Figures 5 and 6, respectively.

Groundwater Monitoring Report
Ainsley’s Service Center (UST Incident #: 11512)
April 16, 2019 Page 6 of 8
Concentrations of benzene, toluene, ethyl-benzene, total xylenes, and MTBE in source-area well
MW1 and downgradient well MW14, decreased during this monitoring period (September 26,
2018 through March 20, 2019). Contaminant concentrations have generally decreased in
monitoring wells MW1, MW3 and MW14. Remediation well RW4 showed an increase of
contaminant concentrations (Table 4). Laboratory analysis detected several petroleum related
contaminants in monitoring wells MW5, MW7, MW12, MW16, and MW30, and it should be noted
that some of these wells have not been sampled and analyzed since 2015. Contaminants
detected for the first time in downgradient well MW30 during this sampling event include:
benzene, toluene, total xylenes, IPE, 1,2,4-trimethylbenzene, naphthalene, and others (Table
4). MTBE has occurred in MW30 since 2013. Laboratory analysis did not detect contaminants in
monitoring wells MW9, MW10, MW11, and MW18 which is a result of groundwater flow
directed generally to the west-southwest. Topography seems to be the major control on the
direction of contaminant migration (Figure 7).

8.0 SUMMARY
This Groundwater Monitoring Report describes activities performed at the Ainsley’s Service
Center site (UST Incident # 11512) during the period of September 26, 2018 through March 20,
2019, and are described below:

 On March 20, 2019, GMA collected water-level measurements and groundwater samples
from thirteen monitoring wells (MW1, MW3, MW5, MW7, MW9, MW10, MW11, MW12,
MW14, MW6, MW18, MW30 and RW4).
 The horizontal component of groundwater flow in the surficial aquifer was directed
toward the southwest along an average horizontal hydraulic gradient of approximately
0.003 feet per foot.
 Seven out of the thirteen monitoring well samples contained a detectable concentration
of at least one petroleum-related contaminant at a concentration greater than the 15A
NCAC 2L groundwater standards.
 GCLs did not occur during this sampling event.
 Contaminant concentrations in well RW4 increased during this monitoring period.
 Contaminant concentrations in wells MW1, MW3 and MW14 decreased during this
monitoring period.
 Several petroleum related contaminants were detected in monitoring wells MW5, MW7,
MW12, and MW16, these wells have not been analyzed since 2015
 Several petroleum related contaminants appeared for the first time in downgradient
monitoring well MW30 and historical surface water data for surface water sample SW3.
 The contaminant plume is migrating down gradient and is discharging to the surface
water drainage, as is evident by contaminant concentrations detected in monitoring well
MW30.

Groundwater Monitoring Report
Ainsley’s Service Center (UST Incident #: 11512)
April 16, 2019 Page 7 of 8
9.0 RECOMMENDATIONS
GMA recommends the continuation of semi-annual groundwater monitoring; to include, at a
minimum, the wells that were sampled during this sampling event MW1, MW3, MW5, MW7,
MW9, MW10, MW11, MW12, MW14, MW16, MW18, MW30 and RW4, as well as MW15. GMA
would also like to sample town wells (Well#1 and Well#2), if possible. GMA recommends
continued monitoring of the surface water in the ditch along the southern property line of the
site due to the presence of petroleum-related contaminants in previous surface water samples.
The next semi-annual groundwater monitoring event is scheduled for September of 2019. GMA
will submit all surface water and groundwater samples to a North Carolina certified laboratory
(Prism) for analysis of VOCs by EPA Method 6200B.

10.0 REFERENCES CITED
Coastal Environmental Services, Inc., 1994, Phase I Groundwater Quality Assessment, Ainsley’s
Service Center, Creswell, Washington County, North Carolina, 5 pages.
Coastal Environmental Services, Inc., 1995a, Comprehensive Site Assessment Report, Ainsley’s
Service Center, Creswell, Washington County, North Carolina, 7 pages.
Coastal Environmental Services, Inc., 1995b, Comprehensive Site Assessment Addendum,
Ainsley’s Service Center, Creswell, Washington County, North Carolina, 5 pages.
Coastal Environmental Services, Inc., 2005, Quarterly Monitoring Report, Ainsley’s Service
Center, Creswell, Washington County, North Carolina, 4 pages.
ENSCI Engineering Group, P.A., 1995, Corrective Action Plan, Ainsley’s Service Center, Creswell,
Washington County, North Carolina, 23 pages.
ENSCI Engineering Group, P.A., 1996, Review of Corrective Action Plan, Ainsley’s Service
Center, Creswell, Washington County, North Carolina, 5 pages.
Environmental Protection Agency, U.S., 2011, Drinking Water Contaminants; National Primary
Drinking Water Regulations, retrieved on November 14, 2011,
http://water.epa.gov/drink/contaminants/index.cfm.
Groundwater Management Associates, Inc., 2008, Sensitive Receptor Survey Update and
Remediation Monitoring Report, Ainsley’s Service Center, Creswell, Washington County,
North Carolina, 7 pages.
Groundwater Management Associates, Inc., 2011, Free Product Recovery Report, Ainsley’s
Service Center, Creswell, Washington County, North Carolina, 6 pages.
Groundwater Management Associates, Inc., 2016a, Remediation Monitoring Report, Ainsley’s
Service Center, Creswell, Washington County, North Carolina, 10 pages.
Groundwater Management Associates, Inc., 2016b, New Technology Cleanup Plan, Ainsley’s
Service Center, Creswell, Washington County, North Carolina, 18 pages.
Groundwater Management Associates, Inc., 2017, Remediation Monitoring Report, Ainsley’s
Service Center, Creswell, Washington County, North Carolina, 7 pages.
Groundwater Management Associates, Inc., 2018a, Remediation Monitoring Report, Ainsley’s
Service Center, Creswell, Washington County, North Carolina, 8 pages.
Groundwater Management Associates, Inc., 2018b, Remediation Monitoring Report, Ainsley’s
Service Center, Creswell, Washington County, North Carolina, 7 pages.
Groundwater Monitoring Report
Ainsley’s Service Center (UST Incident #: 11512)
April 16, 2019 Page 8 of 8
Landmark Engineering and Environmental, P.C., 2002, Pilot Testing Report, Ainsley’s Service
Center, Creswell, Washington County, North Carolina, 4 pages.
North Carolina Division of Waste Management, 2013, Guidelines for Assessment and Corrective
Action for UST Releases: North Carolina Department of Environment and Natural
Resources, Underground Storage Tank Section, Raleigh, North Carolina, 198 pages.
Triangle Environmental Inc., 1996, Corrective Action Plan Addendum, Ainsley’s Service Center,
Creswell, Washington County, North Carolina, 21 pages.

FIGURES
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LEGEND
Date: 7/29/2015
Project No.111601
TOPOGRAPHIC MAP
AINSLEY SERVICE CENTER, CRESWELL, WASHINGTON CO., NC
File: DRAWINGS/111601 TOPO2015729 Figure 1
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FeetCRESWELL QUADRANGLENORTH CAROLINA - WASHINGTON COUNTY7.5 MINUTE SERIES (TOPOGRAPHIC)CONTOUR INTERVAL=5 FEETMAP DATED 1954 (PHOTOREVISED 1974)
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LOCATION OF MONITORING WELLSANDSURFACE WATER SAMPLES
- LEGEND -
PROJECT: 111601
AINSLEY SERVICE CENTERCRESWELL, WASHINGTON CO., NC
FIGURE 3 DATE 1/14/2016
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- LEGEND -
PROJECT: 111601
AINSLEY SERVICE CENTERCRESWELL, WASHINGTON CO., NC
FIGURE 4 DATE 3/21/2019
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NM
NM
4.4
NM
NM
NM NM
1,500
NM
NM
NM
NM
74
NM
NM
NM
NM
<0.5
NM
NM
NM
?
?
?
?
1.0 1,000?N SEVENTH STUS HWY 64 WEST - SR 1219
CHESSON S T
0 6030'
BENZENE PLUME MAP,3/20/2019
$
- LEGEND -
PROJECT: 111601
AINSLEY SERVICE CENTERCRESWELL, WASHINGTON CO., NC
FIGURE 5 DATE 4/10/2019
SCALE IN FEET
@A MONITORING WELL, TYPE II
@A(MONITORING WELL, TYPE III
!A P&T/SVE RECOVERY WELL
SW SAMPLE LOCATIONS
AD INACTIVEWSW
BENZENE PLUME
INTERMITTENT DITCH
UNNAMED CANAL
ROAD CENTERLINES
PARCELS
ESTIMATED HORIZONTAL EXTENT OF BENZENE AT CONCENTRATIONSGREATER THAN 15A NCAC 2L GROUNDWATER STANDARDS.
Concentrations of Benzene in parts per billion (ppb) are listed beside each well.Benzene standard (per 15A NCAC 2L) is 1.0 ppb. Value inside ( ) not used to construct map.
FILE: DRAWINGS/111601/BENZENE201904
AD
@A
@A
@A
@A
@A
@A
@A @A
@A@A
@A
@A
@A@A@A
@A
@A
@A @A
@A
@A
@A @A
@A
@A
@A
@A
@A
@A
@A
@A @A
!A
!A
!A
!A
!A
@A(
@A(
MW21
MW14MW28
MW12
MW16
MW18
MW11 MW13MW22
MW23
MW26MW27
MW29
MW30
MW31
MW32
MW19
MW20
MW15
MW25 MW24
MW2
RW4
MW7
MW8
RW2
MW9
MW10
MW6
MW5
MW17
MW4
MW3
RW5
RW1
MW1
RW3
MW33MW34
SW1
SW2
SW3
(<1.0)
430
NM
1.9
NM
<1.0
<1.0
<1.0
0.29 J
NM
150
NM
0.60 J NM
(<1.0)
NM
NM
NM
NM
NMNM
NM
NM
31
NM
NM
NM NM
<1.0
NM
NM
NM
NM
NM
NM
NM
NM
NM
NM
NM
NM
0.58 J
?
2 0 .0
?
?
2 0 .0
N SEVENTH STUS HWY 64 WEST - SR 1219
CHESSON ST
0 60'
MTBE PLUME MAP,3/20/2019
$
- LEGEND -
PROJECT: 111601
AINSLEY SERVICE CENTERCRESWELL, WASHINGTON CO., NC
FIGURE 6 DATE 4/10/2019
SCALE IN FEET
@A MONITORING WELL, TYPE II
@A(MONITORING WELL, TYPE III
!A P&T/SVE RECOVERY WELL
SW SAMPLE LOCATIONS
AD INACTIVEWSW
MTBE PLUME
INTERMITTENT DITCH
UNNAMED CANAL
ROAD CENTERLINES
PARCELS
ESTIMATED HORIZONTAL EXTENT OF METHYL TERT-BUTYL ETHER (MTBE) AT CONCENTRATIONSGREATER THAN 15A NCAC 2L GROUNDWATER STANDARDS,
Concentrations of MTBE in parts per billion (ppb) are listed beside each well.MTBE standard (per 15A NCAC 2L) is 20 ppb. Value inside ( ) not used to construct map.
FILE: DRAWINGS/111601/MTBE20180926
^
US HWY 64 WEST
US HWY 64 EAST
2
8
468
68 86848
68
8
6
8
8 84
488
8
8 8888
84
8
88
8
8
4 84
6
NCCGIA
$LEGEND
DATE: 8/29/2018
Project No. 111601
WASHINGTON COUNTY, NC DIGITAL ELEVATION MODEL
AINSLEY SERVICE CENTER, CRESWELL, WASHINGTON CO.,NC
File: DRAWINGS/111601/ DEMnew
FIGURE 7
0 400200FeetSCALE IN FEET^SITE
SITE BOUNDARIESROAD CENTERLINESTOPOGRAPHIC CONTOUR- 2 FOOT INTERVAL
STREAMUNNAMED CANALINTERMITTENT DITCHPARCELS
ELEVATION (FEET AMSL) High : 9752Low : 0

TABLES
Table 1. List of Adjacent Properties and Properties with Water-Supply Wells Within 1500 Feet of the Site
Ainsley's Service Center Creswell, Washington County UST Incident #: 11512
PO Box 68
Creswell, NC 27928
WSW2, municipal,
active, and potable 930 ft SE
7147 David Davenport 213 N. 6th St.
Creswell, NC 27928
212 N. 6th St.
Creswell, NC 27928 active nonpotable WSW 530 ft SE
2120 Gerald Woodley 118 W. Palmetto St.
Creswell, NC 27928
0093
3002 Town of Creswell Leigh St.
Creswell, NC 27928
Property Owner's
Address
Distance and Direction
from the Site*
203 US Hwy 64 W Bus.
Creswell, NC 27928
2557 Newlands Rd.
Columbia, NC 27925
Well Number
and Status
* The distance (in feet) is measured from the well, if one is present, or from the closest corner of the property, as shown on Figure 2.
5236 David & Patricia
Davenport
212 N. 6th St.
Creswell, NC 27928
206 N. 7th St.
Creswell, NC 27928
7579 Palmetto St.
Creswell, NC 27928
150 ft SE
Town of Creswell 975 ft SE
same
4204 Ronald & Daphne
Barnes 200 ft S
WSW1, municipal,
active, and potable
PO Box 68
Creswell, NC 27928
N. 7th St.
Creswell, NC 27928
PO Box 7
Creswell, NC 27928
207 US Hwy 64 E
Creswell, NC 27928
PO Box 1007
Plymouth, NC 27962
180 ft SW
Site
120 ft E
US Hwy 64 E
Creswell, NC 27928
9346 Mount Vernon Cr.
Alexandria, VA 22309 170 ft N
160 ft W
PO Box 305
Creswell, NC 27928
305 N. 7th St.
Creswell, NC 27928
PO Box 98
Creswell, NC 27928
Property Owner Property Address
Cleo Hill
3594
Parcel
Number
2534
2312
Bryan & Susan
Ainsley
Washington County
6526 East Carolina Bank
7.30 Clyde Smithson, Jr.
260 ft E
0268 Timothy & Deborah
Payne
202 N. 7th St.
Creswell, NC 27928
PO Box 156
Creswell, NC 27928 inactive WSW 450 ft SW
101 US Hwy 64 W.
Creswell, NC 27928
2956 Ambrose Rd.
Creswell, NC 27928 inactive WSW7525Charles & Tina Broome
PO Box 71
Creswell, NC 27928 inactive WSW 560 ft SW
William White, Jr.115 N. 7th St.
Creswell, NC 27928
PO Box 116
Creswell, NC 27928 1 WSW, status unknown 640 ft SW
Table 2. Summary of Surface-Water Sampling Analytical Results
Ainsley's Service Center Creswell, Washington County UST Incident #: 11512
Well Sample Date benzene toluene ethyl-
benzene
total
xylenes MTBE EDB IPE
1,2,4-
trimethyl-
benzene
1,3,5-
trimethyl-
benzene
naph-
thalene acetone 4-isopropyl-
toluene
tetrachloro-
ethylene
cis-1,2-
dichlor-
ethylene
2/25/2009 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 <10 < 0.5 < 0.5 < 0.5
10/1/2014 1 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 71 < 0.5 1.7 0.97
6/16/2015 < 0.5 380 1.6 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 1.9 < 1.0 36 15 < 0.5 < 0.5
12/15/2015 2 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 <10 < 0.5 < 0.5 < 0.5
9/29/2016 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 12 < 0.5 < 0.5 < 0.5
3/15/2018 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 6.1 J < 0.5 < 0.5 < 0.5
2/25/2009 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 <10 < 0.5 < 0.5 < 0.5
10/1/2014 < 0.5 0.98 < 0.5 < 0.5 10 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 <10 < 0.5 < 0.5 < 0.5
6/17/2015 3 < 0.5 < 0.5 < 0.5 < 0.5 1.6 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 6.4 J < 0.5 < 0.5 < 0.5
12/15/2015 < 0.5 < 0.5 < 0.5 < 0.5 2.9 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 <10 < 0.5 < 0.5 < 0.5
9/29/2016 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 <10 < 0.5 < 0.5 < 0.5
3/15/2018 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 7.1 J < 0.5 < 0.5 < 0.5
10/1/2014 1.5 0.95 < 0.5 < 0.5 2.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 <10 < 0.5 < 0.5 < 0.5
6/17/2015 < 0.5 < 0.5 < 0.5 < 0.5 8.6 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 <10 < 0.5 < 0.5 < 0.5
12/15/2015 < 0.5 < 0.5 < 0.5 < 0.5 0.77 J < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 <10 < 0.5 < 0.5 < 0.5
9/29/2016 < 0.5 < 0.5 < 0.5 < 1.5 0.74 J < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 6.3 J < 0.5 < 0.5 < 0.5
3/15/2018 < 0.5 < 0.5 < 0.5 < 1.5 1.1 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 <10 < 0.5 < 0.5 < 0.5
51 11 97 670 690 0.31 13,000 390 630 330 6,000 330 3.3 4900
1.0 600 600 500 20 0.02 70 400 400 6.0 6,000,000 25 0.70 70
All concentrations are expressed in micrograms per liter (ug/L), which is equivalent to parts per billion (ppb).1 10/1/2014 - SW1 - Carbon Tetrachloride (1.3 ug/L, 2B Std. = 1.6 ug/L)
J = Analyte was positively identified, but the concentration is estimated below the reporting limit 2 12/15/2015 - SW1 - Chloroform (0.73 ug/L, 2B Std. = 70 ug/L)
MTBE = Methyl tert-butyl ether 3 6/17/2015 - SW2 - Acetone (6.4 J ug/L, 2B Std. = 2000 ug/L)
EDB = Ethylene dibromide NA = Not analyzed IPE = Isopropyl ether NSE = No standard established
15A NCAC 2B Standards
15A NCAC 2L Standards
SW1
SW2
SW3

Table 3. Well Construction and Water Level Measurements
Ainsley's Service Center Creswell, Washington County UST Incident #: 11512
MW1 13 2 3 - 13 100.00 4.29 95.71 2.84 97.16 4.03 95.97 3.43 96.57
MW2 13 2 3 - 13 99.38 3.66 95.72 2.36 97.02
MW3 13 2 3 - 13 99.68 3.93 95.75 2.47 97.21 3.67 96.01 3.04 96.64
MW4 30 2 25 - 30 99.49
MW5 13 2 3 - 13 99.78 3.25 96.53
MW6 13 2 3 - 13 100.08
MW7 13 2 3 - 13 99.60 4.25 95.35 2.9 96.70 3.53 96.07
MW8 13 2 3 - 13 99.21
MW9 13 2 3 - 13 99.17 2.52 96.65
MW10 13 2 3 - 13 99.92 3.04 96.88
MW11 12 2 2 - 12 98.90 2.95 95.95
MW12 12 2 2 - 12 98.80 2.85 95.95
MW13 12 2 2 - 12 99.20
MW14 12 2 2 - 12 99.09 3.67 95.42 2.43 96.66 3.45 95.64 3.02 96.07
MW15 11 2 6 - 11 97.84
MW16 15 2 3 - 15 98.26 2.34 95.92
MW17 15 2 3 - 15 100.28
MW18 40 2 35 - 40 98.40 2.49 95.91
MW19 15 2 3 - 15 98.43
MW20 15 2 3 - 15 98.29
MW21 15 2 3 - 15 98.41
MW22 20 2 5 - 20 101.48
MW23 20 2 5 - 20 100.74 5.65 95.09 4.6 96.14
MW24 20 2 5 - 20 98.40
MW25 20 2 5 - 20 97.97
MW26 12 2 2 - 12 100.94
MW27 27 2 17 - 27 100.88 5.90 94.98 4.98 95.90
MW28 23 2 3 - 23 98.58 3.36 95.22 2.27 96.31
MW29 25 2 5 - 25 101.44
MW30 25 2 5 - 25 100.07 3.3 1.86 94.91
MW31 25 2 5 - 25 96.74
MW32 25 2 5 - 25 97.63
MW33 25 2 5 - 25 98.59
MW34 25 2 5 - 25 101.47
RW1 24 4 unknown 99.61
RW2 23 4 unknown 100.78
RW3 8 2 3 - 8 98.93 2.70 96.23 1.01 97.92
RW4 7.5 2 unknown 99.40 3.49 95.91 2.09 97.31 3.25 96.15 2.68 96.72
RW5 8 2 3 - 8 99.64
All measurements are in feet except for well diameter, which is in inches.
Well depths and screened intervals are relative to land surface.
Top of well casing elevations are relative to an arbitrary benchmark, the top of well casing of monitoring well MW1.
Depth to water measured from the top of the well casing.
* = Free Product was present in the monitoring well
3/20/2019
Depth to
Water
Elevation
of Water
9/26/2018
Depth to
Water
Elevation
of Water
3/15/2018
Depth to
Water
Elevation
of Water
6/7/2017
Depth to
Water
Elevation
of Water
Height of
stickup (ft)
Well
Number
Well
Depth
Well
Diameter
(inches)
Screened
Interval
Elevation
of
Casing
Table 4. Summary of Monitoring Well Sampling Analytical Results (Page 1 of 7)
Ainsley's Service Center Creswell, Washington County UST Incident #: 11512
Well Sample Date benzene toluene ethyl-benzene total xylenes MTBE EDB IPE 1,2-DCA 1,2,4-trimethyl-benzene
1,3,5-trimethyl-benzene naphthalene 2-methyl-naphthalene isopropyl-benzene n-propyl-benzene n-butyl-benzene sec-butyl-benzene tert-butyl-benzene 4-isopropyl-toluene styrene 2-chloro-toluene tetrachloro-ethylene trichloro-ethylene
cis-1,2-dichlor-ethylene
trans-1,2-dichloro-ethylene
vinyl chloride lead C5-C8aliphatics C9-C18aliphatics C19-C36aliphatic C9-C22aromatic
7/27/1994 4600 4000 1500 3900 1300 < 5.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
1/24/1995 21,000 30,000 1400 15,000 < 50 < 50 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
7/17/1995 3000 2800 630 1200 660 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
12/26/2001 1500 2900 490 2500 200 NA 74 NA NA NA 78 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 64 NA NA NA NA
3/24/2002 3700 3900 860 4300 1000 NA < 50 NA NA NA 100 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 89 NA NA NA NA
6/5/2002 7000 7200 1400 7000 1500 NA < 50 NA NA NA 340 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 130 NA NA NA NA
9/5/2002 5500 12,000 2100 8200 < 200 NA < 200 NA NA NA 53 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 27 NA NA NA NA
12/19/2002 8100 6500 1900 8000 2400 NA 32 NA NA NA 220 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 12 NA NA NA NA
4/1/2003 10,000 11,000 1600 7500 1800 NA < 500 NA NA NA 210 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 19 NA NA NA NA
6/23/2003 9600 14,000 2700 15,000 < 250 NA < 1200 NA NA NA 130 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 53 NA NA NA NA
9/11/2003 5600 11,000 1800 8700 < 50 NA < 250 NA NA NA 190 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 110 NA NA NA NA
5/17/2004
12/21/2004
5/21/2008 6500 5300 1400 5900 580 < 50 < 50 < 50 1600 500 490 110 < 50 170 < 100 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 NA 24,000 14,700 < 100 6300
2/25/2009 6400 2900 1100 3830 620 < 50 < 50 < 50 1100 340 450 100 61 170 < 100 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 NA 8500 7300 < 100 890
9/15/2009 4400 4500 1400 6600 340 < 50 < 50 < 50 1900 650 590 250 < 50 120 < 100 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 NA NA NA NA NA
6/8/2010 3400 7300 1500 6900 2300 < 50 < 50 < 50 1800 550 630 NA 56 160 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 NA NA NA NA NA
2/1/2011 1100 2600 750 3200 2000 < 5.0 14 < 5.0 890 270 470 NA 74 210 27 14 < 5.0 5.7 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
11/8/2011 1500 1200 570 1900 460 < 5.0 6.4 < 5.0 570 140 400 NA 61 160 25 9.8 < 5.0 9.9 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA 11,000 3000 NA 3600
7/10/2012 150 39 58 130 120 < 5.0 < 5.0 < 5.0 25 7.1 98 NA 6.0 60 < 5.0 5.6 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
4/24/2013 130 330 220 650 12 < 2.5 < 2.5 < 2.5 220 61 110 NA 20 60 11 7.8 < 2.5 4.8 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 NA 2700 1300 NA 1100
12/10/2013 300 770 400 1500 6.7 < 2.5 < 2.5 < 2.5 370 130 140 NA 18 57 24 7.8 < 2.5 6.7 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 NA NA NA NA NA
10/1/2014 520 870 700 1500 < 10 < 5.0 < 5.0 < 5.0 820 210 260 NA 46 110 29 21 < 5.0 20 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
6/16/2015 460 910 740 2300 < 20 < 10 < 10 < 10 950 280 300 NA 59 180 39 16 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 NA NA NA NA NA
12/15/2015 160 340 280 830 < 10 < 5.0 < 5.0 < 5.0 290 85 110 NA 17 48 8.9 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
9/29/2016 460 730 680 1900 < 10 < 5.0 < 5.0 < 5.0 910 290 340 NA 46 150 23 11 < 5.0 6.6 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
6/7/2017 660 1200 1200 3900 < 10 < 5.0 < 5.0 < 5.0 1400 540 710 NA 80 250 27 15 0.6 11.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
3/15/2018 330 600 680 1710 < 10 < 5.0 < 5.0 < 5.0 650 240 350 NA 34 96 15 7 < 5.0 5.6 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
9/26/2018 320 360 560 1400 <10 <5.0 0.31 J <5.0 610 180 270 NA 32 89 35 8 0.44 J 5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 NA NA NA NA NA
3/20/2019 74 160 210 570 <1.0 <5.0 <0.5 <0.5 220 63 84 NA 20 67 13 5.4 0.34 J 3.1 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NA NA NA NA NA
7/27/1994 5800 500 640 1800 6200 < 50 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
1/24/1995 17,000 20,000 1900 9000 4800 < 100 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
7/17/1995 14,000 6000 1900 5000 16,000 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
12/26/2001 6800 2900 1400 4890 6900 NA < 200 NA NA NA 86 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 51 NA NA NA NA
3/24/2002 3100 1000 920 2700 3400 NA < 100 NA NA NA 110 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 11 NA NA NA NA
6/5/2002 4200 1400 950 2610 5200 NA < 50 NA NA NA 190 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 17 NA NA NA NA
9/5/2002 3900 2000 1000 3120 3400 NA 58 NA NA NA 42 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 11 NA NA NA NA
12/19/2002 4700 1900 1200 2910 3500 NA 20 NA NA NA 150 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 10 NA NA NA NA
4/1/2003 5900 3900 1200 2900 4400 NA < 500 NA NA NA 150 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 10 NA NA NA NA
6/23/2003 7700 3100 1200 3000 7400 NA < 500 NA NA NA 100 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 12 NA NA NA NA
9/11/2003 3100 3400 1200 4100 1500 NA < 250 NA NA NA 180 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 41 NA NA NA NA
5/17/2004 36 21 8.8 22 25 NA < 5.0 NA NA NA 160 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 18 NA NA NA NA
12/21/2004 4.5 < 5.0 < 1.0 < 3.0 40 NA < 1.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 37 NA NA NA NA
5/21/2008 4300 370 410 1000 2400 < 50 < 50 < 50 240 58 320 11 < 50 < 50 < 100 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 NA 3700 2400 < 100 4150
2/25/2009 4400 200 320 640 2200 < 50 < 50 < 50 170 < 50 160 32 < 50 67 < 100 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 NA 11,000 3010 < 100 391
9/14/2009 7600 290 1100 1880 2300 < 50 < 50 < 50 420 < 50 490 29 < 50 < 50 < 100 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 NA NA NA NA NA
6/9/2010 6800 980 810 1390 1200 < 50 < 50 < 50 260 < 50 400 NA < 50 120 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 NA NA NA NA NA
1/31/2011 3100 210 420 670 600 < 5.0 28 < 5.0 200 28 240 NA 35 91 10 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
11/7/2011 6300 130 670 850 530 < 5.0 31 < 5.0 210 31 330 NA 49 120 16 5.4 < 5.0 9.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA 12,000 3200 NA 1200 J
7/11/2012 6700 110 840 910 550 < 5.0 35 < 5.0 260 37 280 NA 42 110 14 6.5 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
4/24/2013 5900 91 670 280 600 < 2.5 45 < 2.5 56 8.8 430 NA 72 200 15 11 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 NA 13,000 1300 NA 1400
12/10/2013 8000 63 710 640 650 < 5.0 39 < 5.0 49 8.1 420 NA 70 200 16 8.8 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
10/1/2014 1 6000 68 850 790 210 < 5.0 24 < 5.0 63 26 570 NA 85 230 31 22 < 5.0 16 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
6/16/2015 5900 130 720 510 360 < 5.0 32 < 5.0 140 26 560 NA 110 290 27 14 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
12/15/2015 3100 3000 670 3000 700 < 5.0 16 < 5.0 740 200 290 NA 43 130 20 10 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
9/29/2016 6900 86 560 390 140 < 5.0 30 < 5.0 78 13 460 NA 68 190 18 8.4 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
6/7/2017 7700 85 880 480 250 < 5.0 39 < 5.0 150 21 640 NA 78 220 25 9.9 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
3/15/2018 1300 56 210 120 27 < 5.0 5 < 5.0 48 5.1 170 NA 28 83 8.7 < 50 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
7/27/1994 4800 3500 780 3000 7000 < 250 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
1/24/1995
7/17/1995
12/26/2001
3/24/2002
6/5/2002
9/5/2002
12/19/2002
4/1/2003 7400 22,000 3300 17,100 6400 NA < 500 NA NA NA 460 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 25 NA NA NA NA
6/23/2003
9/11/2003
5/17/2004
12/21/2004
5/21/2008
2/25/2009
9/14/2009
6/7/2010
1/31/2011 4000 16,000 2400 9300 2100 < 20 29 < 20 2800 810 940 NA 140 430 44 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 NA NA NA NA NA
11/7/2011
7/11/2012 8200 13,000 2300 9900 4000 < 10 40 < 10 2600 1100 900 NA 170 580 150 58 < 10 26 < 10 < 10 < 10 < 10 < 10 < 10 < 10 NA NA NA NA NA
4/23/2013 3800 4000 1000 3100 1400 < 10 20 < 10 740 210 280 NA 56 140 33 25 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 NA 14,000 2200 NA 3400
12/11/2013 1700 3200 440 2800 240 < 25 < 25 < 25 540 140 150 NA < 25 62 < 25 < 25 < 25 < 25 < 25 < 25 < 25 < 25 < 25 < 25 < 25 NA NA NA NA NA
9/30/2014 5400 7300 1900 12,000 1600 < 25 26 < 25 2400 640 680 NA 160 310 93 82 < 25 83 < 25 < 25 < 25 < 25 < 25 < 25 < 25 NA NA NA NA NA
6/16/2015 4900 8700 1800 6800 2200 < 25 40 < 25 2200 610 580 NA 120 330 44 < 25 < 25 < 25 < 25 < 25 < 25 < 25 < 25 < 25 < 25 NA NA NA NA NA
12/15/2015 4600 49 340 330 100 < 5.0 19 < 5.0 66 10 450 NA 62 180 20 8.5 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
9/29/2016 4500 6300 1500 7100 750 < 5.0 < 5.0 < 5.0 2200 930 740 NA 140 470 150 52 < 5.0 26 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
6/7/2017 8200 12,000 2300 13,000 3100 < 5.0 47 < 5.0 3900 1100 1300 NA 150 480 80 38 < 5.0 22 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
3/15/2018 5100 3,000 940 4,900 690 < 5.0 22 < 5.0 1400 380 470 NA 60 190 32 15 < 5.0 7.8 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
9/26/2018 8600 8,300 2200 11,000 1700 <5.0 37 <5.0 3400 770 750 NA 110 320 110 23 <5.0 17.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 NA NA NA NA NA
3/20/20192 1800 1,300 350 1,400 430 <0.5 11 <0.5 500 160 190 NA 26 68 <0.5 6.3 <0.5 3.9 J <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NA NA NA NA NA
1.0 600 600 500 20 0.02 70 0.40 400 400 6.0 30 70 70 70 70 70 25 70 100 0.70 3.0 70 100 0.03 15 400 700 10,000 200
5000 260,000 84,500 85,500 20,000 50 70,000 400 28,500 25,000 6000 12,500 25,000 30,000 6900 8500 15,000 11,700 70,000 NSE 700 3000 70,000 100,000 30 15,000 NSE NSE NSE NSE
510 110 970 6700 6900 3.1 130,000 370 3900 6300 3300 800 3200 800 39 NSE NSE 3300 NSE NSE 33 300 49,000 100,000 24 250 12,000 NSE NSE NSE
All concentrations are expressed in micrograms per liter (ug/L), which is equivalent to parts per billion (ppb).MTBE = Methyl tert-butyl ether
GCL = gross contamination level EDB = Ethylene dibromide
Shaded = Concentration exceeds the 15A NCAC 2L groundwater standard IPE = Isopropyl ether
Red = Concentration exceeds the GCL 1,2-DCA = 1,2-Dichloroethane
NA = Not analyzed H = Estimated concentration with a high bias
NSE = No standard established 1 10/1/2014 - MW2 - Acetone (22 J ug/L, 2L Std. = 6000 ug/L)
J = Analyte was positively identified, but the concentration is estimated below the reporting limit 2 3/20/2019-MW3 - Methyl Isobutyl Ketone (8.4 J µg/L, 2L Std. = 100 µg/L)
Well not sampled, 0.15 feet of free product present
Well not sampled, 0.35 feet of free product present
Well not sampled, 0.95 feet of free product present
Well not sampled, 0.24 feet of free product present
Well not sampled, 0.40 feet of free product present
Well not sampled, 0.55 feet of free product present
Well not sampled, 2.28 feet of free product present
15A NCAC 2L Standards
GCL
10X 15A NCAC 2B Standards
Well not sampled, 0.08 feet of free product present
Well not sampled, 0.02 feet of free product present
Well not sampled, 1.34 feet of free product present
Well not sampled, 0.71 feet of free product present
Well not sampled, 0.28 feet of free product present
Well not sampled, 0.21 feet of free product present
Well not sampled, 0.20 feet of free product present
Well not sampled, 0.50 feet of free product present
Well not sampled, 0.04 feet of free product present
Well not sampled, 1.30 feet of free product present
Well not sampled, 2.47 feet of free product present
MW1
MW3
MW2
Table 4. Summary of Monitoring Well Sampling Analytical Results (Page 2 of 7)
Ainsley's Service Center Creswell, Washington County UST Incident #: 11512
Well Sample Date benzene toluene ethyl-benzene total xylenes MTBE EDB IPE 1,2-DCA 1,2,4-trimethyl-benzene
1,3,5-trimethyl-benzene naphthalene 2-methyl-naphthalene isopropyl-benzene n-propyl-benzene n-butyl-benzene sec-butyl-benzene tert-butyl-benzene 4-isopropyl-toluene styrene 2-chloro-toluene tetrachloro-ethylene trichloro-ethylene
cis-1,2-dichlor-ethylene
trans-1,2-dichloro-ethylene
vinyl chloride lead C5-C8aliphatics C9-C18aliphatics C19-C36aliphatic C9-C22aromatic
1/24/1995 22 15 5.0 17 21 < 5.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
7/17/1995 2.5 < 1.0 < 1.0 < 1.0 < 5.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
12/26/2001 < 1.0 9.5 4.2 42 7.9 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 11 NA NA NA NA
3/24/2002 5.9 64 50 280 7.5 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 11 NA NA NA NA
6/5/2002 < 1.0 2.9 1.4 5.7 6.5 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 11 NA NA NA NA
9/5/2002 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 15 NA NA NA NA
12/19/2002 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 10 NA NA NA NA
4/1/2003 2.2 1.2 < 1.0 < 1.0 98 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 10 NA NA NA NA
6/23/2003 < 1.0 < 5.0 < 1.0 < 3.0 93 NA < 5.0 NA NA NA 120 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 5.0 NA NA NA NA
9/11/2003 < 1.0 < 5.0 < 1.0 < 3.0 45 NA < 5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 42 NA NA NA NA
5/17/2004 < 1.0 < 5.0 < 1.0 < 3.0 38 NA < 1.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 32 NA NA NA NA
12/21/2004 4.5 < 5.0 < 1.0 < 3.0 40 NA < 1.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 37 NA NA NA NA
5/21/2008 < 0.5 < 0.5 < 0.5 < 1.5 51 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 < 150
2/25/2009 < 0.5 < 0.5 < 0.5 < 1.5 30 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 42 J < 150 < 100 < 150
9/15/2009 < 0.5 < 0.5 < 0.5 < 1.5 9.9 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 9.8 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/9/2010 < 0.5 < 0.5 < 0.5 < 1.5 2.7 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
1/31/2011 < 0.5 < 0.5 < 0.5 < 1.5 2.6 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/7/2011 < 0.5 < 0.5 < 0.5 < 1.5 2.2 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
7/11/2012 < 0.5 < 0.5 < 0.5 < 1.5 1.2 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/24/2013 < 0.5 < 0.5 < 0.5 < 1.5 0.68 J < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
12/11/2013 < 0.5 < 0.5 < 0.5 < 1.5 0.52 J < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
10/1/2014 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/16/2015 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
12/15/2015 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/29/2016 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
1/24/1995 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 5.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
7/17/1995 < 1.0 < 1.0 < 1.0 < 1.0 5.3 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
12/26/2001 < 1.0 < 1.0 < 1.0 < 1.0 24 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 74 NA NA NA NA
3/24/2002 < 1.0 < 1.0 < 1.0 3.3 39 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 14 NA NA NA NA
6/5/2002 < 1.0 < 1.0 < 1.0 < 1.0 25 NA < 1.0 NA NA NA 42 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 32 NA NA NA NA
9/5/2002 < 1.0 < 1.0 < 1.0 < 1.0 90 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 31 NA NA NA NA
12/19/2002 < 1.0 < 1.0 < 1.0 < 1.0 90 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 21 NA NA NA NA
4/1/2003 < 1.0 < 1.0 < 1.0 < 1.0 77 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 18 NA NA NA NA
6/23/2003 < 1.0 < 5.0 < 1.0 < 3.0 39 NA < 5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 21 NA NA NA NA
9/11/2003 < 1.0 < 5.0 < 1.0 < 3.0 34 NA < 5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 43 NA NA NA NA
5/17/2004 < 1.0 < 5.0 < 1.0 < 3.0 20 NA < 5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 17 NA NA NA NA
12/21/2004 < 1.0 < 5.0 < 1.0 < 3.0 40 NA < 1.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 5.0 NA NA NA NA
5/21/2008 1 < 0.5 < 0.5 < 0.5 < 1.5 91 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 0.76 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 < 150
2/25/2009 < 0.5 < 0.5 < 0.5 < 1.5 32 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 40 J < 150 < 100 < 150
9/14/2009 < 0.5 < 0.5 < 0.5 < 1.5 37 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 0.60 < 0.5 < 0.5 5.5 < 0.5 < 0.5 NA NA NA NA NA
6/9/2010 2 < 0.5 < 0.5 < 0.5 < 1.5 8.9 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 NA < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 0.67 < 0.5 < 0.5 78 < 0.5 < 0.5 NA NA NA NA NA
1/31/2011 < 0.5 < 0.5 < 0.5 < 1.5 23 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 0.81 6.6 5.2 120 1.2 < 0.5 NA NA NA NA NA
11/7/2011 < 0.5 < 0.5 < 0.5 < 1.5 25 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 1.9 0.64 1.0 120 < 0.5 < 0.5 NA 63 < 50 NA 2.1 J
7/11/2012 < 0.5 < 0.5 < 0.5 < 1.5 6.6 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 200 1.0 0.60 NA NA NA NA NA
4/24/2013 < 0.5 < 0.5 < 0.5 < 1.5 4.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 130 0.73 < 0.5 NA 45 J < 50 NA < 50
12/11/2013 < 0.5 < 0.5 < 0.5 < 1.5 2.1 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 91 0.54 < 0.5 NA NA NA NA NA
10/1/2014 < 0.5 < 0.5 < 0.5 < 1.5 1.6 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 64 0.56 < 0.5 NA NA NA NA NA
6/17/2015 < 0.5 < 0.5 < 0.5 < 1.5 2.1 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 92 1.0 < 0.5 NA NA NA NA NA
3/20/2019 0.43 J <0.5 <0.5 <1.5 1.9 <0.5 <0.5 <0.5 <0.5 <0.5 <1.0 NA <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 61 0.8 <0.5 NA NA NA NA NA
1/24/1995 3500 490 830 2500 < 100 < 100 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
7/17/1995 7300 660 1000 3000 1600 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
12/26/2001 970 29 880 1121 110 NA < 10 NA NA NA 72 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 40 NA NA NA NA
3/24/2002 1000 35 980 1023 310 NA < 10 NA NA NA 41 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 14 NA NA NA NA
6/5/2002 890 28 740 840 290 NA < 10 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 40 NA NA NA NA
9/5/2002 4100 < 50 1200 410 4800 NA < 50 NA NA NA 120 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 11 NA NA NA NA
12/19/2002 1500 8.2 670 142 1600 NA 11 NA NA NA 97 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 11 NA NA NA NA
4/1/2003 1300 < 10 420 58 1800 NA < 10 NA NA NA 140 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 10 NA NA NA NA
6/23/2003 610 < 5.0 220 75 380 NA 9.2 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 11 NA NA NA NA
9/11/2003 460 < 25 120 30 1100 NA < 25 NA NA NA 39 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 30 NA NA NA NA
5/17/2004 960 < 250 450 < 150 1500 NA < 250 NA NA NA 65 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 12 NA NA NA NA
12/21/2004 400 < 120 180 < 75 740 NA < 25 NA NA NA 28 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 5.6 NA NA NA NA
5/21/2008 500 7.2 7.2 20 100 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 170 47 23 71 < 10 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA 860 797 < 100 950
2/25/2009 480 6.6 < 5.0 30 210 < 5.0 < 5.0 < 5.0 < 5.0 5.9 140 24 29 86 6.1 J < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA 1800 780 < 100 260
9/15/2009 350 12 95 331 15 < 5.0 < 5.0 < 5.0 46 < 5.0 110 24 16 20 < 10 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
6/8/2010 430 7.1 13 24 11 < 5.0 < 5.0 < 5.0 5.4 < 5.0 120 NA 14 44 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
2/1/2011 250 < 5.0 10 22 11 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 120 NA 26 78 5.1 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
11/8/2011 430 7.0 9.9 51 370 < 5.0 < 5.0 < 5.0 < 5.0 9.8 240 NA 46 140 13 6.8 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA 3600 820 NA 810
7/11/2012 10 < 2.5 < 2.5 7.2 J 110 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 53 NA 12 37 3.4 4.0 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 NA NA NA NA NA
4/24/2013 < 0.5 < 0.5 < 0.5 < 1.5 9.9 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 2.8 NA < 0.5 1.3 < 0.5 1.1 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 96 J 76 J NA 45 J
12/10/2013 < 0.5 < 0.5 < 0.5 < 1.5 12 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 2.4 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
10/1/2014 < 0.5 < 0.5 < 0.5 < 1.5 1.6 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 2.4 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/17/2015 < 0.5 < 0.5 < 0.5 < 1.5 2.6 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 0.73 < 0.5 < 0.5 NA NA NA NA NA
1.0 600 600 500 20 0.02 70 0.40 400 400 6.0 30 70 70 70 70 70 25 70 100 0.70 3.0 70 100 0.03 15 400 700 10,000 200
5000 260,000 84,500 85,500 20,000 50 70,000 400 28,500 25,000 6000 12,500 25,000 30,000 6900 8500 15,000 11,700 70,000 NSE 700 3000 70,000 100,000 30 15,000 NSE NSE NSE NSE
510 110 970 6700 6900 3.1 130,000 370 3900 6300 3300 800 3200 800 39 NSE NSE 3300 NSE NSE 33 300 49,000 100,000 24 250 12,000 NSE NSE NSE
All concentrations are expressed in micrograms per liter (ug/L), which is equivalent to parts per billion (ppb).MTBE = Methyl tert-butyl ether
GCL = gross contamination level EDB = Ethylene dibromide
Shaded = Concentration exceeds the 15A NCAC 2L groundwater standard IPE = Isopropyl ether
Red = Concentration exceeds the GCL 1,2-DCA = 1,2-Dichloroethane
NA = Not analyzed H = Estimated concentration with a high bias
NSE = No standard established 1 5/21/2008 - MW5 - 4-Chlorotoluene (0.76 ug/L, 2L Std. = 24 ug/L)
J = Analyte was positively identified, but the concentration is estimated below the reporting limit 2 6/9/2010 - MW5 - Ethanol (310 ug/L, 2L Std. = 4000 ug/L)
GCL
10X 15A NCAC 2B Standards
MW6
MW5
15A NCAC 2L Standards
MW4
"deep"
Type IIIwell
Table 4. Summary of Monitoring Well Sampling Analytical Results (Page 3 of 7)
Ainsley's Service Center Creswell, Washington County UST Incident #: 11512
Well Sample Date benzene toluene ethyl-
benzene
total
xylenes MTBE EDB IPE 1,2-DCA
1,2,4-
trimethyl-
benzene
1,3,5-
trimethyl-
benzene
naphthalene 2-methyl-
naphthalene
isopropyl-
benzene
n-propyl-
benzene
n-butyl-
benzene
sec-butyl-
benzene
tert-butyl-
benzene
4-isopropyl-
toluene styrene 2-chloro-
toluene
tetrachloro-
ethylene
trichloro-
ethylene
cis-1,2-
dichlor-
ethylene
trans-1,2-
dichloro-
ethylene
vinyl
chloride lead C5-C8
aliphatics
C9-C18
aliphatics
C19-C36
aliphatic
C9-C22
aromatic
1/24/1995 680 25 36 150 850 < 100 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
7/17/1995 240 < 1.0 5.0 13 570 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
3/24/2002 37 < 10 13 20 600 NA < 10 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 25 NA NA NA NA
6/5/2002 24 < 10 12 28 620 NA < 10 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 52 NA NA NA NA
9/5/2002 <2.0 < 2.0 < 2.0 4.7 180 NA < 2.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 11 NA NA NA NA
5/21/2008 < 0.5 < 0.5 < 0.5 < 1.5 42 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 < 150
2/25/2009 < 0.5 < 0.5 < 0.5 < 1.5 73 < 0.5 1.1 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 97 < 150 < 100 < 150
9/14/2009 36 < 0.5 < 0.5 < 1.5 240 < 0.5 2.3 < 0.5 < 0.5 < 0.5 < 2.0 < 9.8 0.81 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/9/2010 12 1.2 < 0.5 9.2 44 < 0.5 1.0 < 0.5 0.86 < 0.5 21 NA 6.1 11 0.73 1.2 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
2/1/2011 3.3 < 0.5 < 0.5 2.6 13 < 0.5 0.66 < 0.5 4.2 0.50 2.3 NA 1.2 1.6 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/7/2011 13 10 < 0.5 15 5.0 < 0.5 0.77 < 0.5 0.72 < 0.5 0.95 J NA 0.77 0.55 < 0.5 0.58 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 430 120 NA 72
7/11/2012 0.53 < 0.5 < 0.5 1.5 4.9 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/24/2013 13 1.4 < 0.5 15 3.4 < 0.5 < 0.5 < 0.5 1.4 < 0.5 6.6 NA 3.7 4.6 < 0.5 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 310 180 J NA 96 J
12/11/2013 25 0.71 < 0.5 2.6 4.4 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 2.0 NA 0.78 0.57 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
10/1/2014 1.9 < 0.5 < 0.5 0.64 J 3.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA 0.60 < 0.5 < 0.5 0.54 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/17/2015 6.0 < 0.5 < 0.5 < 1.5 0.92 J < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 0.61 J NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
12/15/2015 0.93 < 0.5 < 0.5 0.56 J 2.3 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 0.95 J NA 0.52 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/29/2016 < 0.5 < 0.5 < 0.5 < 1.5 0.97 J < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/7/2017 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
3/15/2018 4.0 0.67 < 0.5 1.2 J 1.2 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 6.5 NA 2.3 2.4 < 0.5 0.99 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
3/20/2019 <0.5 <0.5 <0.5 0.30 J 0.58 J <0.5 0.41 J <0.5 <0.5 <0.5 0.47 J NA <0.5 0.32 J <0.5 0.47 J <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NA NA NA NA NA
1/24/1995 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 5.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
7/17/1995 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
12/26/2001 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 44 NA NA NA NA
3/24/2002 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 20 NA NA NA NA
6/5/2002 < 1.0 < 1.0 < 1.0 1.4 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 24 NA NA NA NA
9/5/2002 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 11 NA NA NA NA
12/19/2002 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 10 NA NA NA NA
4/1/2003 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 10 NA NA NA NA
6/23/2003 < 1.0 < 5.0 < 1.0 < 3.0 < 1.0 NA < 5.0 NA NA NA 94 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 5.0 NA NA NA NA
9/11/2003 < 1.0 < 5.0 < 1.0 < 3.0 < 1.0 NA < 5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 17 NA NA NA NA
5/17/2004 < 1.0 < 5.0 < 1.0 < 3.0 < 1.0 NA < 5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 5.0 NA NA NA NA
12/21/2004 < 1.0 < 5.0 < 1.0 < 3.0 < 1.0 NA < 1.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 5.0 NA NA NA NA
5/21/2008 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 < 150
2/25/2009 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 < 150
9/14/2009 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 11 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
2/1/2011 < 0.5 < 0.5 < 0.5 < 1.5 22 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/7/2011 < 0.5 < 0.5 < 0.5 < 1.5 16 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
7/11/2012 < 0.5 < 0.5 < 0.5 < 1.5 4.6 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/24/2013 < 0.5 < 0.5 < 0.5 < 1.5 11 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 3.5 J 12 J NA 1.4 J
12/11/2013 < 0.5 < 0.5 < 0.5 < 1.5 2.7 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
10/1/2014 < 0.5 < 0.5 < 0.5 < 1.5 4.3 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/17/2015 < 0.5 < 0.5 < 0.5 < 1.5 2.1 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
1/24/1995 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 5.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
7/17/1995 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
12/26/2001 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 12 NA NA NA NA
3/24/2002 < 1.0 2.8 1.5 7.6 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 11 NA NA NA NA
6/5/2002 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 11 NA NA NA NA
9/5/2002 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 11 NA NA NA NA
12/19/2002 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 49 NA NA NA NA
4/1/2003 < 1.0 2.1 < 1.0 1.7 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 35 NA NA NA NA
6/23/2003 1.1 < 5.0 < 1.0 < 3.0 < 1.0 NA < 5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 15 NA NA NA NA
9/11/2003 < 1.0 < 5.0 < 1.0 < 3.0 < 1.0 NA < 5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 22 NA NA NA NA
5/17/2004 < 1.0 < 5.0 < 1.0 < 3.0 < 1.0 NA < 5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 160 NA NA NA NA
12/21/2004 < 1.0 < 5.0 < 1.0 < 3.0 < 1.0 NA < 1.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 15 NA NA NA NA
5/21/2008 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 < 150
2/25/2009 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 < 150
9/15/2009 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/8/2010 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
2/1/2011 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/8/2011 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
7/10/2012 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/24/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
12/10/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
10/1/2014 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/17/2015 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
3/20/2019 <0.5 <0.5 <0.5 <1.5 <1.0 <0.5 <0.5 <0.5 <0.5 <0.5 <1.0 NA <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NA NA NA NA NA
1.0 600 600 500 20 0.02 70 0.40 400 400 6.0 30 70 70 70 70 70 25 70 100 0.70 3.0 70 100 0.03 15 400 700 10,000 200
5000 260,000 84,500 85,500 20,000 50 70,000 400 28,500 25,000 6000 12,500 25,000 30,000 6900 8500 15,000 11,700 70,000 NSE 700 3000 70,000 100,000 30 15,000 NSE NSE NSE NSE
510 110 970 6700 6900 3.1 130,000 370 3900 6300 3300 800 3200 800 39 NSE NSE 3300 NSE NSE 33 300 49,000 100,000 24 250 12,000 NSE NSE NSE
All concentrations are expressed in micrograms per liter (ug/L), which is equivalent to parts per billion (ppb).MTBE = Methyl tert-butyl ether
GCL = gross contamination level EDB = Ethylene dibromide
Shaded = Concentration exceeds the 15A NCAC 2L groundwater standard IPE = Isopropyl ether
Red = Concentration exceeds the GCL 1,2-DCA = 1,2-Dichloroethane
NA = Not analyzed H = Estimated concentration with a high bias
NSE = No standard established
J = Analyte was positively identified, but the concentration is estimated below the reporting limit
MW8
GCL
10X 15A NCAC 2B Standards
MW9
15A NCAC 2L Standards
MW7
Table 4. Summary of Monitoring Well Sampling Analytical Results (Page 4 of 7)
Ainsley's Service Center Creswell, Washington County UST Incident #: 11512
Well Sample Date benzene toluene ethyl-benzene total xylenes MTBE EDB IPE 1,2-DCA 1,2,4-trimethyl-benzene
1,3,5-trimethyl-benzene naphthalene 2-methyl-naphthalene isopropyl-benzene n-propyl-benzene n-butyl-benzene sec-butyl-benzene tert-butyl-benzene 4-isopropyl-toluene styrene 2-chloro-toluene tetrachloro-ethylene trichloro-ethylene
cis-1,2-dichlor-ethylene
trans-1,2-dichloro-ethylene
vinyl chloride lead C5-C8aliphatics C9-C18aliphatics C19-C36aliphatic C9-C22aromatic
1/24/1995 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 5.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
7/17/1995 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
12/26/2001 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 28 NA NA NA NA
3/24/2002 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 16 NA NA NA NA
6/5/2002 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 31 NA NA NA NA
9/5/2002 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 11 NA NA NA NA
12/19/2002 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 10 NA NA NA NA
4/1/2003 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 10 NA NA NA NA
6/23/2003 < 1.0 < 5.0 < 1.0 < 3.0 1.4 NA <5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 5.0 NA NA NA NA
9/11/2003 < 1.0 < 5.0 < 1.0 < 3.0 1.4 NA <5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 24 NA NA NA NA
5/17/2004 < 1.0 < 5.0 < 1.0 < 3.0 < 1.0 NA <5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 5.0 NA NA NA NA
12/21/2004 < 1.0 < 5.0 < 1.0 < 3.0 1.4 NA < 1.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 5.0 NA NA NA NA
5/21/2008 < 0.5 < 0.5 < 0.5 < 1.5 4.8 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 < 150
2/25/2009 < 0.5 < 0.5 < 0.5 < 1.5 1.3 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 < 150
9/15/2009 < 0.5 < 0.5 < 0.5 < 1.5 6.1 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/8/2010 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
2/1/2011 < 0.5 < 0.5 < 0.5 < 1.5 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/8/2011 < 0.5 < 0.5 < 0.5 < 1.5 0.59 J < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
7/11/2012 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/24/2013 < 0.5 < 0.5 < 0.5 < 1.5 0.89 J < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 17 J NA 4.1 J
12/10/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
10/1/2014 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/17/2015 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
3/20/2019 <0.5 <0.5 <0.5 <1.5 <1.0 <0.5 <0.5 <0.5 <0.5 <0.5 <.0 NA <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NA NA NA NA NA
7/17/1995 42 < 1.0 5.2 < 1.0 41 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
12/26/2001 2500 120 900 1800 270 NA < 25 NA NA NA 37 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 62 NA NA NA NA
3/24/2002 260 < 25 120 200 26 NA < 25 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 11 NA NA NA NA
6/5/2002 790 22 310 466 140 NA < 5.0 NA NA NA 41 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 37 NA NA NA NA
9/5/2002 120 < 10 70 49 59 NA < 10 NA NA NA 48 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 11 NA NA NA NA
12/19/2002 14 < 1.0 11 3.3 35 NA 1.9 NA NA NA 19 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 11 NA NA NA NA
4/1/2003 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 10 NA NA NA NA
6/23/2003 < 1.0 < 5.0 < 1.0 < 3.0 < 1.0 NA < 5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 14 NA NA NA NA
9/11/2003 160 < 25 79 38 < 5.0 NA < 25 NA NA NA 42 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 33 NA NA NA NA
5/21/2008 920 10 5.1 39 350 < 5.0 7.2 H < 5.0 < 5.0 < 5.0 110 5.3 J 21 64 < 10 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA 900 487 < 100 650
2/25/2009 160 < 2.0 < 2.0 5.2 190 < 2.0 2.8 < 2.0 6.9 < 2.0 27 < 10 4.5 11 < 4.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 NA 1000 260 < 100 < 100
9/15/2009 780 6.3 4.4 36 92 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 140 16 24 68 < 4.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 NA NA NA NA NA
6/8/2010 250 2.6 11 11 9.8 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 66 NA 10 29 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 NA NA NA NA NA
2/1/2011 < 0.5 < 0.5 < 0.5 < 1.5 1.2 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/8/2011 52 0.78 < 0.5 4.1 9.2 < 0.5 0.79 < 0.5 0.75 0.94 19 NA 2.9 6.6 0.76 0.57 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 290 120 NA 130
7/10/2012 < 0.5 < 0.5 < 0.5 < 1.5 2.4 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/24/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 4.5 J 11 J NA 2.5 J
12/10/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
10/1/2014 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/17/2015 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
3/20/2019 <0.5 <0.5 <0.5 <1.5 <1.0 <0.5 <0.5 <0.5 <0.5 <0.5 <1.0 NA <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NA NA NA NA NA
7/17/1995 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
12/26/2001 < 10 < 10 < 10 < 10 690 NA < 10 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 12 NA NA NA NA
3/24/2002 < 10 < 10 < 10 < 10 110 NA < 10 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 11 NA NA NA NA
6/5/2002 21 < 5.0 < 5.0 11 350 NA < 5.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 17 NA NA NA NA
9/5/2002 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 11 NA NA NA NA
12/19/2002 < 1.0 < 1.0 < 1.0 < 1.0 2.5 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 10 NA NA NA NA
4/1/2003 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 10 NA NA NA NA
6/23/2003 < 1.0 < 5.0 < 1.0 < 3.0 < 1.0 NA < 5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 5.0 NA NA NA NA
9/11/2003 < 1.0 < 5.0 < 1.0 < 3.0 3.3 NA < 5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 6.5 NA NA NA NA
5/17/2004 < 1.0 < 5.0 < 1.0 < 3.0 11 NA < 5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 5.0 NA NA NA NA
12/21/2004 < 1.0 < 5.0 < 1.0 < 3.0 < 1.0 NA < 1.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 5.0 NA NA NA NA
5/21/2008 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 < 150
2/25/2009 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 < 150
9/14/2009 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/8/2010 < 0.5 < 0.5 < 0.5 < 1.5 5.3 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
1/31/2011 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/7/2011 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
7/11/2012 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/23/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
12/11/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
10/1/2014 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/17/2015 < 0.5 0.63 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 0.88 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
3/20/2019 <0.5 <0.5 <0.5 0.42 J 0.29 J <0.5 <0.5 <0.5 <0.5 <0.5 <1.0 NA <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NA NA NA NA NA
1.0 600 600 500 20 0.02 70 0.40 400 400 6.0 30 70 70 70 70 70 25 70 100 0.70 3.0 70 100 0.03 15 400 700 10,000 200
5000 260,000 84,500 85,500 20,000 50 70,000 400 28,500 25,000 6000 12,500 25,000 30,000 6900 8500 15,000 11,700 70,000 NSE 700 3000 70,000 100,000 30 15,000 NSE NSE NSE NSE
510 110 970 6700 6900 3.1 130,000 370 3900 6300 3300 800 3200 800 39 NSE NSE 3300 NSE NSE 33 300 49,000 100,000 24 250 12,000 NSE NSE NSE
All concentrations are expressed in micrograms per liter (ug/L), which is equivalent to parts per billion (ppb).MTBE = Methyl tert-butyl ether
GCL = gross contamination level EDB = Ethylene dibromide
Shaded = Concentration exceeds the 15A NCAC 2L groundwater standard IPE = Isopropyl ether
Red = Concentration exceeds the GCL 1,2-DCA = 1,2-Dichloroethane
NA = Not analyzed H = Estimated concentration with a high bias
NSE = No standard established
J = Analyte was positively identified, but the concentration is estimated below the reporting limit
MW12
MW10
MW11
15A NCAC 2L Standards
GCL
10X 15A NCAC 2B Standards
Table 4. Summary of Monitoring Well Sampling Analytical Results (Page 5 of 7)
Ainsley's Service Center Creswell, Washington County UST Incident #: 11512
Well Sample Date benzene toluene ethyl-benzene total xylenes MTBE EDB IPE 1,2-DCA 1,2,4-trimethyl-benzene
1,3,5-trimethyl-benzene naphthalene 2-methyl-naphthalene isopropyl-benzene n-propyl-benzene n-butyl-benzene sec-butyl-benzene tert-butyl-benzene 4-isopropyl-toluene styrene 2-chloro-toluene tetrachloro-ethylene trichloro-ethylene
cis-1,2-dichlor-ethylene
trans-1,2-dichloro-ethylene
vinyl chloride lead C5-C8aliphatics C9-C18aliphatics C19-C36aliphatic C9-C22aromatic
7/17/1995 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
12/26/2001 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 56 NA NA NA NA
6/5/2002 <1.0 < 1.0 62 < 1.0 2.7 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 66 NA NA NA NA
9/5/2002 320 350 270 500 92 NA 25 NA NA NA 27 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 11 NA NA NA NA
12/19/2002 310 210 180 420 18 NA 1.4 NA NA NA 53 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 10 NA NA NA NA
4/1/2003 6.6 2.0 4.2 4.4 < 1.0 NA < 1.0 NA NA NA 33 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 11 NA NA NA NA
6/23/2003 80 < 120 31 < 75 < 25 NA < 120 NA NA NA 25 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 5.2 NA NA NA NA
9/11/2003 16 < 5.0 10 13 < 1.0 NA < 5.0 NA NA NA 28 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 37 NA NA NA NA
5/17/2004 < 1.0 < 5.0 3.1 < 3.0 1.8 NA < 5.0 NA NA NA 1.4 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 5.4 NA NA NA NA
12/21/2004 < 1.0 < 5.0 < 1.0 < 3.0 2.3 NA < 1.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 8.0 NA NA NA NA
5/21/2008 < 0.5 < 0.5 < 0.5 < 1.5 2.9 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 < 150
2/25/2009 < 0.5 < 0.5 4.2 < 1.5 1.3 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 2.2 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 < 150
9/15/2009 < 0.5 < 0.5 < 0.5 < 1.5 0.79 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 9.4 1.2 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
2/1/2011 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/8/2011 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
7/10/2012 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/24/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
12/11/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
10/1/2014 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/17/2015 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
3/20/2019
7/17/1995 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
12/26/2001 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 48 NA NA NA NA
3/24/2002 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 11 NA NA NA NA
6/5/2002 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 26 NA NA NA NA
9/5/2002 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 11 NA NA NA NA
12/19/2002 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 10 NA NA NA NA
4/1/2003 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA < 1.0 NA NA NA < 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 10 NA NA NA NA
6/23/2003 < 1.0 < 5.0 < 1.0 < 3.0 < 1.0 NA < 5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 6.6 NA NA NA NA
9/11/2003 < 1.0 < 5.0 < 1.0 < 3.0 < 1.0 NA < 5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 27 NA NA NA NA
5/17/2004 < 1.0 < 5.0 < 1.0 < 3.0 < 1.0 NA < 5.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 24 NA NA NA NA
12/21/2004 < 1.0 < 5.0 < 1.0 < 3.0 < 1.0 NA < 1.0 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA < 5.0 NA NA NA NA
5/21/2008 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 < 150
2/25/2009 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 < 150
9/14/2009 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/8/2010 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
1/31/2011 < 0.5 < 0.5 < 0.5 < 1.5 5.4 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/7/2011 < 0.5 < 0.5 < 0.5 < 1.5 20 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 21 J < 50 NA < 50
7/11/2012 < 0.5 < 0.5 < 0.5 < 1.5 55 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/24/2013 0.76 < 0.5 < 0.5 0.89 J 1100 < 0.5 4.6 < 0.5 < 0.5 < 0.5 < 1.0 NA 1.6 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 590 76 J NA 29 J
12/11/2013 240 6.0 2.8 110 1600 < 2.5 14 < 2.5 52 15 24 NA 9.0 12 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 NA NA NA NA NA
10/1/2014 390 6.6 3.6 53 1100 < 2.5 14 < 2.5 39 11 37 NA 10 16 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 NA NA NA NA NA
6/17/2015 1000 14 10 72 1100 < 2.5 15 < 2.5 40 14 72 NA 29 41 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 < 2.5 NA NA NA NA NA
12/15/2015 630 12 6.0 60 840 < 5.0 17 < 5.0 18 11 110 NA 26 56 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
9/29/2016 310 8.7 2.6 50 390 < 5.0 17 < 5.0 4.6 3.5 78 NA 14 29 1.0 1.5 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
6/7/2017 120 4.2 1.8 30 290 < 5.0 13 < 5.0 4.2 2.8 120 NA 15 31 1.2 1.4 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
3/15/2018 850 13.0 9.0 130 200 < 5.0 17 < 5.0 5.6 1.4 160 NA 41 51 1.8 2.4 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
9/26/2018 570 12.0 10.0 79 120 <5.0 12 <5.0 2.6 1.3 140 NA 38 47 2.3 3.2 0.29 J 0.54 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 NA NA NA NA NA
3/20/2019 440 9.5 3.0 66 150 <5.0 18 <0.5 1.9 1.0 130 NA 30 46 2.5 2.6 <0.5 0.33 J <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NA NA NA NA NA
6/23/2003 67 < 250 < 50 < 150 190 NA < 250 NA NA NA 1.2 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 370 NA NA NA NA
9/11/2003 170 < 25 29 26 120 NA < 25 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 140 NA NA NA NA
12/21/2004 120 < 5.0 1.3 10 360 NA 16 NA NA NA < 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 77 NA NA NA NA
5/21/2008 < 0.5 < 0.5 < 0.5 < 1.5 43 < 0.5 0.91 H < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 46 J < 100 17 J
2/25/2009 < 0.5 < 0.5 < 0.5 < 1.5 5.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 < 150
9/14/2009 < 0.5 < 0.5 < 0.5 < 1.5 46 < 0.5 0.72 < 0.5 < 0.5 < 0.5 < 2.0 < 10 1.4 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/8/2010 < 0.5 < 0.5 < 0.5 < 1.5 25 < 0.5 1.1 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
1/31/2011 < 0.5 < 0.5 < 0.5 < 1.5 3.6 < 0.5 0.52 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/8/2011 < 0.5 < 0.5 < 0.5 < 1.5 0.69 J < 0.5 0.60 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 32 J < 50 NA < 50
7/11/2012 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/23/2013 < 0.5 < 0.5 < 0.5 < 1.5 1.2 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 9.8 J < 50 NA < 50
12/11/2013 < 0.5 < 0.5 < 0.5 < 1.5 1.7 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/30/2014 < 0.5 < 0.5 < 0.5 < 1.5 9.6 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/16/2015 < 0.5 < 0.5 < 0.5 < 1.5 4.2 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
3/20/2019
2/25/2009 < 0.5 < 0.5 < 0.5 < 1.5 45 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 <150
9/15/2009 < 0.5 < 0.5 < 0.5 < 1.5 110 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 9.7 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/8/2010 160 2.3 0.80 16 190 < 0.5 2.0 < 0.5 0.97 < 0.5 28 NA 6.7 13 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
2/1/2011 130 2.2 0.76 11 230 < 0.5 3.0 < 0.5 0.84 < 0.5 37 NA 9.0 17 < 0.5 0.67 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/8/2011 1 160 4.6 2.9 43 120 < 0.5 1.6 < 0.5 2.0 < 0.5 84 NA 18 37 0.93 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 1700 220 NA 260
7/10/2012 820 21 27 120 160 < 0.5 5.9 < 0.5 6.3 3.1 180 NA 42 97 3.3 3.9 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/24/2013 180 3.3 2.3 35 120 < 0.5 2.5 < 0.5 1.4 1.1 94 NA 17 40 2.7 2.9 < 0.5 0.84 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 880 350 NA 290
12/10/2013 1.4 < 0.5 < 0.5 1.8 80 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 4.2 NA 0.87 0.52 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
10/1/2014 < 0.5 < 0.5 < 0.5 1.2 J 35 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 30 NA 3.3 0.88 0.75 1.1 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/17/2015 < 0.5 < 0.5 < 0.5 < 1.5 1.6 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
3/20/2019 1.1 <0.5 <0.5 <1.5 0.60 J <0.5 <0.5 <0.5 <0.5 <0.5 <1.0 NA <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 3.8 <0.5 <0.5 NA NA NA NA NA
2/25/2009 530 190 150 860 40 < 5.0 < 5.0 < 5.0 180 55 68 < 10 16 29 < 10 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA < 5.0 < 5.0 < 5.0 < 5.0 NA 2300 1989 < 100 140
9/14/2009 52 0.98 < 0.5 14 490 < 0.5 < 0.5 < 0.5 2.4 1.8 7.2 < 9.7 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/8/2010 2 < 0.5 < 0.5 < 0.5 < 1.5 39 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA 0.53 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
1/31/2011 < 0.5 < 0.5 < 0.5 < 1.5 34 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA 0.61 < 0.5 < 0.5 0.71 < 0.5 < 0.5 < 0.5 < 0.5 NA < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/7/2011 < 0.5 < 0.5 < 0.5 < 1.5 25 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA 0.83 < 0.5 < 0.5 0.79 < 0.5 < 0.5 < 0.5 < 0.5 NA < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
7/11/2012 < 0.5 < 0.5 < 0.5 < 1.5 12 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 1.1 < 0.5 < 0.5 < 0.5 < 0.5 NA < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/24/2013 < 0.5 < 0.5 < 0.5 < 1.5 12 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 0.92 2.5 34 < 0.5 < 0.5 NA 12 J 14 J NA < 50
12/11/2013 < 0.5 < 0.5 < 0.5 < 1.5 5.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 2.8 4.1 53 < 0.5 < 0.5 NA NA NA NA NA
10/1/2014 < 0.5 < 0.5 < 0.5 < 1.5 2.1 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 0.53 J NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 3.9 5.2 85 < 0.5 < 0.5 NA NA NA NA NA
6/17/2015 < 0.5 < 0.5 < 0.5 < 1.5 0.74 J < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 1.4 5.0 100 < 0.5 < 0.5 NA NA NA NA NA
1.0 600 600 500 20 0.02 70 0.40 400 400 6.0 30 70 70 70 70 70 25 70 100 0.70 3.0 70 100 0.03 15 400 700 10,000 200
5000 260,000 84,500 85,500 20,000 50 70,000 400 28,500 25,000 6000 12,500 25,000 30,000 6900 8500 15,000 11,700 70,000 NSE 700 3000 70,000 100,000 30 15,000 NSE NSE NSE NSE
510 110 970 6700 6900 3.1 130,000 370 3900 6300 3300 800 3200 800 39 NSE NSE 3300 NSE NSE 33 300 49,000 100,000 24 250 12,000 NSE NSE NSE
All concentrations are expressed in micrograms per liter (ug/L), which is equivalent to parts per billion (ppb).J = Analyte was positively identified, but the concentration is estimated below the reporting limit 1 11/8/2011 - MW16 - 1,2-Dichloropropane (0.51 ug/L, 2L Std. = 0.6 ug/L)
GCL = gross contamination level MTBE = Methyl tert-butyl ether 2 6/8/2010 - MW17 - Ethanol (220 ug/L, 2L Std. = 4000 ug/L)
Shaded = Concentration exceeds the 15A NCAC 2L groundwater standard EDB = Ethylene dibromide
Red = Concentration exceeds the GCL IPE = Isopropyl ether
NA = Not analyzed 1,2-DCA = 1,2-Dichloroethane
NSE = No standard established H = Estimated concentration with a high bias
could not locate
15A NCAC 2L Standards
GCL
MW16
10X 15A NCAC 2B Standards
MW17
could not sample
MW14
MW13
MW15
Table 4. Summary of Monitoring Well Sampling Analytical Results (Page 6 of 7)
Ainsley's Service Center Creswell, Washington County UST Incident #: 11512
Well Sample Date benzene toluene ethyl-benzene total xylenes MTBE EDB IPE 1,2-DCA 1,2,4-trimethyl-benzene
1,3,5-trimethyl-benzene naphthalene 2-methyl-naphthalene isopropyl-benzene n-propyl-benzene n-butyl-benzene sec-butyl-benzene tert-butyl-benzene 4-isopropyl-toluene styrene 2-chloro-toluene tetrachloro-ethylene trichloro-ethylene
cis-1,2-dichlor-ethylene
trans-1,2-dichloro-ethylene
vinyl chloride lead C5-C8aliphatics C9-C18aliphatics C19-C36aliphatic C9-C22aromatic
2/25/2009 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 <150
9/15/2009 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 9.7 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/9/2010 1 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
1/31/2011 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/8/2011 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
7/11/2012 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/23/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
12/11/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
10/1/2014 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/17/2015 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
3/20/2019 <0.5 <0.5 <0.5 <1.5 <1.0 <0.5 <0.5 <0.5 <0.5 <0.5 <.0 NA <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NA NA NA NA NA
2/24/2009 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 31 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 <150
9/15/2009 < 0.5 2.9 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 9.8 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 5.2 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/8/2010 < 0.5 0.73 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 1.4 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
2/1/2011 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 1.2 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/8/2011 < 0.5 0.66 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 5.8 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
7/12/2012 < 0.5 0.51 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 8.2 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/23/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
12/11/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/30/2014 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/16/2015 2 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
2/25/2009 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 6.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 <150
9/14/2009 < 0.5 0.55 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 9.7 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/8/2010 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
1/31/2011 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/8/2011 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
7/11/2012 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/23/2013 3 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
12/11/2013 4 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/30/2014 5 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/16/2015 6 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
2/25/2009 < 0.5 < 0.5 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 0.92 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 150 < 100 <150
9/14/2009 < 0.5 8.7 < 0.5 < 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 2.0 < 10 < 0.5 < 0.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/8/2010 < 0.5 0.81 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
1/31/2011 < 0.5 1.8 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/8/2011 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
7/11/2012 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/23/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
12/11/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/30/2014 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/16/2015 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/8/2011 7 98 2.6 < 0.5 11 550 < 0.5 5.5 < 0.5 < 0.5 < 0.5 0.78 J NA 2.9 0.99 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
7/10/2012 8 86 4.7 < 0.5 27 320 < 0.5 6.1 < 0.5 1.8 0.57 9.9 NA 12 11 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/24/2013 21 1.7 < 0.5 11 180 < 0.5 4.6 < 0.5 1.6 < 0.5 22 NA 6.4 15 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 410 120 NA 120
12/10/2013 26 2.3 < 0.5 9.8 680 < 0.5 6.2 < 0.5 1.3 < 0.5 27 NA 4.8 12 < 0.5 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
10/1/2014 1.6 0.70 < 0.5 20 760 < 0.5 7.2 < 0.5 1.0 < 0.5 31 NA 6.2 5.6 < 0.5 0.86 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/16/2015 < 0.5 < 0.5 < 0.5 < 1.5 210 4.8 < 0.5 < 0.5 < 0.5 3.8 NA 1.2 < 0.5 < 0.5 0.50 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/8/2011 7 < 0.5 < 0.5 < 0.5 < 1.5 21 < 0.5 < 0.5 1.3 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
7/10/2012 < 0.5 < 0.5 < 0.5 < 1.5 62 < 0.5 0.60 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/23/2013 < 0.5 < 0.5 < 0.5 < 1.5 110 < 0.5 1.1 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 55 < 50 NA < 50
12/11/2013 30 0.66 < 0.5 0.90 J 190 < 0.5 1.8 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/30/2014 160 2.7 0.56 17 110 < 0.5 4.1 1.5 0.53 < 0.5 5.6 NA 5.4 4.7 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/16/2015 460 4.8 1.7 15 520 < 0.5 6.5 2.0 0.74 < 0.5 15 NA 10 10 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
12/15/2015 8 520 6.8 3.9 29 500 < 0.5 4.7 < 0.5 0.74 < 0.5 30 NA 13 20 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/29/2016 49 3.2 0.91 18 35 < 0.5 0.57 < 0.5 < 0.5 < 0.5 35 NA 9.4 18 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/7/2017 9.9 1.8 0.75 9.0 8.7 < 0.5 < 0.5 < 0.5 0.64 < 0.5 32 NA 5.5 11 < 0.5 0.59 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
3/15/2018 4.6 0.95 < 0.5 5.1 4.8 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 26 NA 4.4 9 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
7/10/2012 < 0.5 < 0.5 < 0.5 < 1.5 11 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 0.64 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
4/23/2013 < 0.5 < 0.5 < 0.5 < 1.5 17 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 0.97 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 5.4 J < 50 NA < 50
12/11/2013 < 0.5 < 0.5 < 0.5 < 1.5 22 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 0.81 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/30/2014 < 0.5 < 0.5 < 0.5 < 1.5 5.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 1.9 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/16/2015 < 0.5 < 0.5 < 0.5 < 1.5 1.2 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 2.4 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
7/10/2012 < 0.5 < 0.5 < 0.5 < 1.5 26 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 3.1 < 0.5 0.56 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 15 J 13 J NA 5.8 J
4/24/2013 < 0.5 < 0.5 < 0.5 < 1.5 13 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 0.60 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 7.3 J < 50 NA < 50
12/10/2013 < 0.5 < 0.5 < 0.5 < 1.5 13 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 0.65 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
10/1/2014 < 0.5 < 0.5 < 0.5 < 1.5 10 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 1.3 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/16/2015 < 0.5 < 0.5 < 0.5 < 1.5 6.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 1.9 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
7/10/2012 9 < 0.5 < 0.5 < 0.5 < 1.5 89 < 0.5 0.91 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
4/23/2013 < 0.5 < 0.5 < 0.5 < 1.5 350 < 0.5 3.3 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 190 12 J NA 1.6 J
12/11/2013 3.2 < 0.5 < 0.5 < 1.5 170 < 0.5 1.8 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/30/2014 < 0.5 < 0.5 < 0.5 < 1.5 17 < 0.5 0.57 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/16/2015 < 0.5 < 0.5 < 0.5 < 1.5 10 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
7/10/2012 < 0.5 < 0.5 < 0.5 < 1.5 100 < 0.5 5.2 0.60 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 10 J < 50 NA < 50
4/24/2013 < 0.5 < 0.5 < 0.5 < 1.5 170 < 0.5 6.3 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 71 < 50 NA < 50
12/10/2013 < 0.5 < 0.5 < 0.5 0.59 J 180 < 0.5 6.7 < 0.5 1.0 < 0.5 0.57 J NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
10/1/2014 < 0.5 < 0.5 < 0.5 < 1.5 180 < 0.5 6.5 0.58 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/16/2015 < 0.5 < 0.5 < 0.5 < 1.5 210 < 0.5 6.7 0.64 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
12/15/2015 < 0.5 < 0.5 < 0.5 < 1.5 250 < 0.5 7.8 0.62 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/29/2016 10 < 0.5 < 0.5 < 0.5 < 1.5 310 < 0.5 9.9 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/7/2017 < 0.5 < 0.5 < 0.5 < 1.5 270 < 0.5 8.3 0.56 < 0.5 < 0.5 0.78 J NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
3/15/2018 < 0.5 < 0.5 < 0.5 < 1.5 270 < 0.5 9.2 0.54 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
1.0 600 600 500 20 0.02 70 0.40 400 400 6.0 30 70 70 70 70 70 25 70 100 0.70 3.0 70 100 0.03 15 400 700 10,000 200
5000 260,000 84,500 85,500 20,000 50 70,000 400 28,500 25,000 6000 12,500 25,000 30,000 6900 8500 15,000 11,700 70,000 NSE 700 3000 70,000 100,000 30 15,000 NSE NSE NSE NSE
510 110 970 6700 6900 3.1 130,000 370 3900 6300 3300 800 3200 800 39 NSE NSE 3300 NSE NSE 33 300 49,000 100,000 24 250 12,000 NSE NSE NSE
All concentrations are expressed in micrograms per liter (ug/L), which is equivalent to parts per billion (ppb).MTBE = Methyl tert-butyl ether 3 4/23/2013 - MW20 - 1,1-Dichloroethane (1.4 ug/L, 2L Std. = 6.0 ug/L)8 12/15/2015 - MW23 - Acetone (13 ug/L, 2L Std. = 6000 ug/L)
GCL = gross contamination level EDB = Ethylene dibromide 4 12/11/2013 - MW20 - 1,1-Dichloroethane (1.7 ug/L, 2L Std. = 6.0 ug/L)9 7/10/2012 - MW26 - Acetone (16 ug/L, 2L Std. = 6000 ug/L)
Shaded = Concentration exceeds the 15A NCAC 2L groundwater standard IPE = Isopropyl ether 5 9/30/2014 - MW20 - 1,1-Dichloroethane (2.7 ug/L, 2L Std. = 6.0 ug/L)10 9/29/2016- MW27- 1,2-Dichloroethane (0.81 ug/L, 2L Std. = 0.4 ug/L)
Red = Concentration exceeds the GCL 1,2-DCA = 1,2-Dichloroethane 6 6/16/2015 - MW20 - 1,1-Dichloroethane (1.7 J ug/L, 2L Std. = 6.0 ug/L)
NA = Not analyzed H = Estimated concentration with a high bias 7 11/8/2011 - MW22 - Acetone (4.7 J ug/L, 2L Std. = 6000 ug/L)
NSE = No standard established 1 6/9/2010 - MW18 - Ethanol (310 ug/L, 2L Std. = 4000 ug/L) 8 7/10/2012 - MW22 - Acetone (6.8 J ug/L, 2L Std. = 6000 ug/L)
J = Analyte was positively identified, but the concentration is estimated below the reporting limit 2 6/16/2015 - MW19 - 1,1-Dichloroethane (0.50 ug/L, 2L Std. = 6.0 ug/L)7 11/8/2011 - MW23 - Methyl ethyl ketone (5.8 ug/L, 2L Std. = 4000 ug/L) & Methyl butyl ketone (1.5 ug/L, NSE)
MW18 "deep"
Type III well
MW25
MW19
MW26
MW27
MW23
15A NCAC 2L Standards
GCL
10X 15A NCAC 2B Standards
MW22
MW20
MW21
MW24
Table 4. Summary of Monitoring Well Sampling Analytical Results (Page 7 of 7)
Ainsley's Service Center Creswell, Washington County UST Incident #: 11512
Well Sample Date benzene toluene ethyl-
benzene
total
xylenes MTBE EDB IPE 1,2-DCA 1,2,4-trimethyl-
benzene
1,3,5-trimethyl-
benzene
naphthalene 2-methyl-
naphthalene
isopropyl-
benzene
n-propyl-
benzene
n-butyl-
benzene
sec-butyl-
benzene
tert-butyl-
benzene
4-isopropyl-
toluene styrene 2-chloro-
toluene
tetrachloro-
ethylene
trichloro-
ethylene
cis-1,2-dichlor-
ethylene
trans-1,2-dichloro-
ethylene
vinyl
chloride lead C5-C8
aliphatics
C9-C18
aliphatics
C19-C36
aliphatic
C9-C22
aromatic
4/23/2013 < 0.5 < 0.5 < 0.5 < 1.5 1.9 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 14 J NA < 50
12/11/2013 < 0.5 < 0.5 < 0.5 < 1.5 100 < 0.5 0.53 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/30/2014 4.4 < 0.5 < 0.5 < 1.5 190 < 0.5 2.6 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/17/2015 43 0.94 < 0.5 13 96 < 0.5 1.8 < 0.5 3.7 1.1 0.68 J NA 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
12/15/2015 110 2.0 < 0.5 26 190 < 0.5 6.2 < 0.5 17 4.4 2.8 NA 2.5 1.4 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/29/2016 140 2.6 0.59 15 130 < 0.5 7.2 < 0.5 7.1 1.4 3.1 NA 3.5 2.2 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/7/2017 200 3.2 1.4 22 74 < 0.5 5.3 < 0.5 2.8 0.76 7.8 NA 7.2 7.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
3/15/2018 17 1.1 < 0.5 11 10 < 0.5 1.3 < 0.5 1.1 < 0.5 14 NA 8.4 16.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/23/2013 < 0.5 < 0.5 < 0.5 < 1.5 4.6 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
12/11/2013 < 0.5 < 0.5 < 0.5 < 1.5 31 < 0.5 < 0.5 < 0.5 1.8 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/30/2014 < 0.5 < 0.5 < 0.5 < 1.5 11 < 0.5 < 0.5 < 0.5 2.9 0.72 < 1.0 NA 0.60 0.62 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/16/2015 < 0.5 < 0.5 < 0.5 < 1.5 5.7 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/23/2013 < 0.5 < 0.5 < 0.5 < 1.5 6.4 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 0.88 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
12/11/2013 < 0.5 < 0.5 < 0.5 < 1.5 43 < 0.5 0.51 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
10/1/2014 < 0.5 < 0.5 < 0.5 < 1.5 130 < 0.5 1.1 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/16/2015 < 0.5 < 0.5 < 0.5 < 1.5 76 < 0.5 1.0 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
3/20/2019 4.4 1.2 <0.5 11 31 <0.5 0.7 <0.5 0.52 0.32 J 20 NA 7.5 11 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NA NA NA NA NA
4/23/2013 1 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 13 J NA < 50
12/11/2013 2 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/30/2014 3 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/16/2015 4 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/23/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 3.8 J < 50 NA < 50
12/11/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/30/2014 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/16/2015 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
12/10/2013 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
10/1/2014 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/17/2015 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
12/10/2013 < 0.5 < 0.5 < 0.5 < 1.5 0.51 J < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA < 50 < 50 NA < 50
10/1/2014 < 0.5 < 0.5 < 0.5 < 1.5 0.51 J < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/16/2015 < 0.5 < 0.5 < 0.5 < 1.5 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 1.0 NA < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
5/21/2008 470 8.2 74 142 750 < 0.5 3.9 H < 0.5 28 5.5 11 < 10 4.1 7.8 0.80 J 0.90 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 370 460 < 100 167
2/25/2009 63 1.7 11 18 78 < 0.5 0.68 < 0.5 5.0 0.70 2.2 < 10 0.87 1.6 < 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 240 94 < 100 < 150
5/21/2008 360 8.6 280 57 52 < 0.5 2.5 < 0.5 4.4 0.60 110 16 28 67 6.3 3.7 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 700 1100 < 100 830
2/25/2009 390 8.3 140 22 42 < 0.5 1.8 < 0.5 15 0.51 110 14 18 42 3.6 2.2 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 2100 880 < 110 274
5/21/2008 1200 480 250 1400 4700 < 50 < 50 < 0.5 1300 510 380 110 < 50 130 < 100 < 50 < 50 52 < 50 < 50 < 50 < 50 < 50 < 50 < 50 NA 4900 7900 1300 6500
2/25/2009 850 540 160 1090 1600 < 5.0 < 5.0 < 0.5 460 170 83 12 11 18 28 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA 5600 8800 1000 1620
9/15/2009 620 150 64 213 900 < 5.0 < 5.0 < 0.5 330 130 73 110 < 5.0 < 5.0 < 10 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
6/8/2010 220 51 49 182 200 < 0.5 < 0.5 < 0.5 110 34 18 NA 3.6 6.0 < 0.5 0.62 < 0.5 0.85 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
1/31/2011 5 530 750 60 270 720 < 0.5 1.4 < 0.5 73 41 11 NA 2.4 5.3 < 0.5 0.63 < 0.5 2.1 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
11/7/2011 6 1000 660 92 470 2000 < 0.5 3.8 < 0.5 350 200 46 NA 7.9 19 < 0.5 2.5 < 0.5 4.4 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 4900 1800 NA 1800
7/12/2012 7 16 5.2 13 64 23 < 0.5 < 0.5 < 0.5 51 3.8 7.6 NA 1.7 4.1 1.1 0.74 < 0.5 0.70 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
4/23/2013 8 580 80 50 180 460 < 0.5 3.3 1.2 54 41 32 NA 5.8 13 4.6 2.0 < 0.5 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 3600 430 NA 660
12/11/2013 75 16 16 58 88 < 0.5 < 0.5 < 0.5 18 2.7 6.2 NA 1.3 1.5 1.4 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/30/2014 9 530 45 170 380 500 < 0.5 1.1 < 0.5 250 46 36 NA 13 27 3.5 2.3 < 0.5 1.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/16/2015 10 640 m.,69 140 830 < 0.5 1.5 < 0.5 56 5.8 19 NA 3.0 4.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
12/15/2015 70 1.1 1.5 6.8 52 < 0.5 < 0.5 < 0.5 9.5 1.9 4.4 NA 0.61 0.54 1.0 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/29/2016 180 7.2 19 72 130 < 0.5 < 0.5 < 0.5 150 23 20 NA 6.0 9.60 5.9 2.2 < 0.5 1.4 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
6/7/2017 450 44 59 110 230 < 0.5 0.74 < 0.5 33 3.6 11 NA 1.8 2.80 0.96 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
3/15/2018 470 89 110 190 410 < 0.5 1.4 < 0.5 72 13 16 NA 3.8 9.70 2.0 0.96 < 0.5 0.66 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
5/21/2008 5100 2000 1600 3760 < 50 < 50 < 50 < 0.5 1600 410 530 140 59 230 86 J < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 NA 10,000 12,900 240 6800
2/25/2009 4500 1100 1700 2540 < 50 < 50 < 50 < 0.5 1300 200 440 210 67 200 < 100 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 NA 5600 8800 320 1650
9/15/2009 3000 130 1800 1148 48 < 5.0 < 5.0 < 0.5 870 110 420 94 72 210 43 15 < 5.0 16 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
6/8/2010 520 67 500 698 < 10 < 5.0 < 5.0 < 0.5 990 140 260 NA 54 170 39 14 < 5.0 7.6 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
1/31/2011 160 120 240 280 < 10 < 5.0 < 5.0 < 0.5 330 36 120 NA 30 120 58 19 < 5.0 8.6 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
11/7/2011 980 52 950 220 26 < 5.0 < 5.0 < 0.5 240 25 310 NA 54 160 32 12 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA 6700 2800 NA 2700
7/12/2012 11 890 45 730 200 < 10 < 5.0 < 5.0 < 5.0 52 7.3 190 NA 32 93 12 6.2 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
4/23/2013 290 34 370 110 < 10 < 5.0 < 5.0 < 5.0 62 < 5.0 110 NA 26 90 28 16 < 5.0 8.2 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA 3100 300 NA 940
12/11/2013 230 26 450 79 5.3 J < 5.0 < 5.0 < 5.0 40 < 5.0 140 NA 27 96 28 15 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
9/30/2014 1500 37 700 130 140 < 5.0 < 5.0 < 5.0 82 12 230 NA 41 130 33 12 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
6/16/2015 540 29 490 100 < 10 < 5.0 < 5.0 < 5.0 29 < 5.0 170 NA 36 110 30 11 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
12/15/2015 1100 48 760 180 160 < 0.5 1.9 < 0.5 60 6.5 310 NA 39 160 28 9.2 < 0.5 1.8 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA NA NA NA NA
9/29/2016 480 29 570 110 <10 < 0.5 < 5.0 < 5.0 37 2.6 340 NA 39 190 31 10.0 < 5.0 2.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
6/7/2017 910 37 680 170 <10 < 0.5 < 5.0 < 5.0 32 2.2 360 NA 43 160 27 9.9 < 5.0 1.7 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
3/15/2018 900 170 680 200 <10 < 0.5 0.81 < 5.0 36 3.6 330 NA 44 170 31 11.0 0.66 1.8 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA NA NA NA NA
9/26/2018 1300 40 800 150 53 <5.0 1.4 <5.0 72 5 350 NA 58 240 32 13.0 0.43 J 2.8 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 NA NA NA NA NA
3/20/2019 1500 92 790 200 <1.0 <0.5 1.1 <0.5 32 2.5 270 NA 50 160 29 10.0 0.32 J 1.8 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NA NA NA NA NA
5/21/2008 530 94 110 230 < 5.0 < 5.0 < 5.0 < 0.5 77 22 36 < 10 5.8 13 < 10 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 NA 670 690 < 100 190
2/25/2009 200 8.1 47 34 2.9 < 0.5 1.1 < 0.5 34 5.1 9.8 < 10 4.5 8.2 0.84 J 0.92 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 NA 660 290 94 J 170
1.0 600 600 500 20 0.02 70 0.40 400 400 6.0 30 70 70 70 70 70 25 70 100 0.70 3.0 70 100 0.03 15 400 700 10,000 200
5000 260,000 84,500 85,500 20,000 50 70,000 400 28,500 25,000 6000 12,500 25,000 30,000 6900 8500 15,000 11,700 70,000 NSE 700 3000 70,000 100,000 30 15,000 NSE NSE NSE NSE
510 110 970 6700 6900 3.1 130,000 370 3900 6300 3300 800 3200 800 39 NSE NSE 3300 NSE NSE 33 300 49,000 100,000 24 250 12,000 NSE NSE NSE
All concentrations are expressed in micrograms per liter (ug/L), which is equivalent to parts per billion (ppb).MTBE = Methyl tert-butyl ether 4 6/16/2015 - MW31 - 1,4-Dichlorobenzene (0.64 ug/L, 2L Std. = 6.0 ug/L) & Chlorobenzene (0.51 ug/L, 2L Std. = 50 ug/L)
GCL = gross contamination level EDB = Ethylene dibromide 5 1/31/2011 - RW3 - Bromoform (0.66 ug/L, 2L Std. = 4.0 ug/L) & Ethanol (270,000 ug/L, 2L Std. = 4000 ug/L)
Shaded = Concentration exceeds the 15A NCAC 2L groundwater standard IPE = Isopropyl ether 6 11/7/2011 - RW3 - Acetone (10 ug/L, 2L Std. = 6000 ug/L) & Methyl isobutyl ketone (6.9 ug/L, 2L Std. = 100 ug/L)
Red = Concentration exceeds the GCL 1,2-DCA = 1,2-Dichloroethane 7 7/12/2012 - RW3 - Methyl isobutyl ketone (0.71 ug/L, 2L Std. = 100 ug/L)
NA = Not analyzed H = Estimated concentration with a high bias 8 4/23/2013 - RW3 - Methyl isobutyl ketone (3.1 ug/L, 2L Std. = 100 ug/L)
NSE = No standard established 1 4/23/2013 - MW31 - 1,4-Dichlorobenzene (0.69 ug/L, 2L Std. = 6.0 ug/L) & Chlorobenzene (1.9 ug/L, 2L Std. = 50 ug/L) 9 9/30/2014 - RW3 - Acetone (11 ug/L, 2L Std. = 6000 ug/L)
J = Analyte was positively identified, but the concentration is estimated below the reporting limit 2 12/11/2013 - MW31 - 1,4-Dichlorobenzene (1.1 ug/L, 2L Std. = 6.0 ug/L) & Chlorobenzene (5.0 ug/L, 2L Std. = 50 ug/L) 10 6/16/2015 - RW3 - Acetone (11 ug/L, 2L Std. = 6000 ug/L) 3 9/30/2014 - MW31 - 1,4-Dichlorobenzene (0.74 ug/L, 2L Std. = 6.0 ug/L) & Chlorobenzene (1.2 ug/L, 2L Std. = 50 ug/L) 11 7/12/2012 - RW4 - Methyl isobutyl ketone (26 ug/L, 2L Std. = 100 ug/L), Methyl ethyl ketone (23 J ug/L, 2L Std. = 4000 ug/L), & Methyl butyl ketone (27 ug/L, NSE)
MW29
MW30
RW2
10X 15A NCAC 2B Standards
MW34
MW31
MW32
RW4
RW3
RW5
RW1
MW33
GCL
15A NCAC 2L Standards
MW28

APPENDIX I

NCDEQ CORRESPONDENCE
ROY COOPER
Governor
MICHAEL S. REGAN
Secre/my
Waste Management
ENVIRONMENTAL QUALITY
MICHAEL SCOTT
Mr. Brian Ainsley
2557 Newlands Rd.
Creswell, NC 27925
December 14, 2018
Re: Notice of Regulatory Requirements
15A NCAC 2L .0407
Dil'eclor
Risk-based Assessment and Corrective Action
for Petroleum Underground Storage Tanks
Acknowledgement of Report Receipt
Dear Mr. Ainsley:
Ainsley's Service Center
203 Old Hwy 64, Creswell
Washington County, NC
Incident Number: 11512
Risk Classification: Intermediate
Ranking: I 185 D
The Division of Waste Management (DWM) Underground Storage Tank (UST), received the GWMR
for the subject site dated October 26, 2018. Please complete the following;
• AFVR (February 2019) on MW-3 and RW-4.
• Groundwater monitoring (March 2019) limited to only the recommended monitoring wells
• Document vertical gradient conditions at the site.
Because a release or discharge has been confirmed, a Licensed Geologist or a Professional Engineer,
certified by the State ofN011h Carolina, is required to prepare and cel1ify all rep011s submitted to the
Department in accordance with Title 15A NCAC 2L .0103(e) and 2L .0111(b).
Please note that before you sell, transfer, or request a "No Further Action" determination for a property
that has not been remediated to below "unrestricted use" standards, you must file a Notice of Residual
Petroleum ("Notice") with the Register of Deeds in the county where the property is located (NCGS
143B-279.9 and 143B-279.11).
Failure to comply with the State's rules in the manner and time specified may result in the assessment of
civil penalties and/or the use of other enforcement mechanisms.
State of North Carolina 1 Environmental Quality 1 Waste Management
UST Section Central Office 1 1646 Mail Service Center 1 Raleigh, NC 27699-16461 [phone]
If you have any questions regarding the actions or the rules mentioned in this letter, please contact me at
the address or telephone number listed below. If you have any questions regarding trust fund eligibility
or reimbursement, please contact the UST Section Trust Fund Branch at [phone].
Sincerely,
6'cJCWohi
Conrad J. Welti
Hydrogeologist
Washington Regional Office
cc: GMA -4300 Sapphire Ct. Suite 100, Greenville, NC 27834
Washington Regional Office 1943 Washington Square MaIl IWashirigton.NC 278891 [phone]

APPENDIX II

TECHNICAL METHODS AND STANDARD PROCEDURES

TECHNICAL METHODS AND STANDARD PROCEDURES

I. COLLECTION OF SURFACE WATER SAMPLES
Surface water samples SW1, SW2, and SW3 were collected using a stainless-steel pitcher and
new disposable nitrile gloves. The stainless-steel pitcher was decontaminated between each
sample location. Prior to sample collection the stainless-steel pitcher was rinsed with surface
water by submerging it into standing water within the surface water feature, then removing it
from the water and dumping its contents on the bank of the surface water feature. The
stainless-steel pitcher was then used to collect standing water within the surface water feature
and transferred to sample containers provided by the North Carolina certified laboratory. Each
sample was added slowly to their respective sample containers in order to minimize the loss of
volatile compounds. All sample containers were stored in plastic Ziploc® bags and were
immediately placed in a cooler with ice. Samples were delivered by a courier to a North
Carolina certified laboratory, Prism Laboratories, Inc., for analysis under chain-of-custody
protocol.

II. WATER-LEVEL MEASUREMENTS
Depths to water within wells were measured with an electronic water-level indicator that is
accurate to within 0.01 feet. Standard practice is to measure the water level after an adequate
period of time has elapsed after removing the well seal to allow the water level in the well to
equilibrate. Water-level measurements are collected throughout the monitoring-well network
within the minimum possible time, and the electronic water-level indicator is decontaminated
between wells to minimize the risk of cross contamination.

III. WELL PURGING AND COLLECTION OF GROUNDWATER SAMPLES
The monitoring wells were purged of three well volumes prior to groundwater sampling using
new, decontaminated, disposable bailers and new vinyl rope. Fresh, disposable nitrile gloves
were worn during the purging and sampling of each well. The groundwater samples were
collected immediately after purging in order to minimize the loss of volatile compounds.

Groundwater samples collected for volatile organic compound analysis by EPA Method 6200B
were collected in a bailer and subsequently transferred to 40 milliliter, zero-headspace glass
vials. Each groundwater sample was added slowly to the vial to minimize the loss of volatile
compounds. Air bubbles were not allowed to be present in the sample container once the
Teflon®-lined cap was fitted to the vial. Samples were also collected from wells MW1, MW2,
MW6, MW9, MW10, MW11, MW16, MW22, MW25, MW27, and MW30 for analysis of dissolved
iron, nitrate, sulfate, alkalinity, and dissolved methane. All sample containers were stored in
plastic Ziploc® bags and were immediately placed in a cooler with ice. Samples were delivered
by a courier to a North Carolina certified laboratory, Prism Laboratories, Inc., for analysis under
chain-of-custody protocol.

APPENDIX III

COPY OF LABORATORY REPORT AND CHAIN-OF-CUSTODY RECORDS

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