RA-3936_23651_CA_RMR_20160120

Active Remediation Monitoring Report (Subsequent) January 20, 2016
Duncan’s Mini Mart, Roxboro, North Carolina Progress Project 1015148.001
2
B BACKGROUND INFORMATION
The site is located at 1909 Burlington Road, Roxboro, Person County, North Carolina (Figures 1
and 2). The underground storage tanks (USTs) have been owned and operated by McLeod Oil
since 1985. NESCO, Inc. (NESCO) completed a Site Check as required by a Notice of Regulatory
Requirements (NORR) dated April 24, 2001 issued by the North Carolina Department of
Environment and Natural Resources (NCDEQ). Based on laboratory analysis of soil samples
collected during the Site Check, the soil in the vicinity of the UST system was impacted above the
North Carolina Action Levels. NESCO completed a Limited Site Assessment (LSA) in January of
2002. Based on the findings in the LSA, the NCDEQ required a Comprehensive Site Assessment
(CSA) be completed which NESCO completed in March 2003. Fuss and O’Neill, Inc. also
completed a Pre-CAP Monitoring Report, dated October 2003. Based on the available information
and historical groundwater data, several constituents exceeded their respective North Carolina 2L
Groundwater Quality Standards (NC2LGWQS) in groundwater samples collected from the on-site
monitoring wells. The detected concentrations of benzene and ethylene dibromide (EDB) also
exceeded the Gross Contamination Levels (GCLs). The site is classified as “high risk” based on
the presence of petroleum-related compounds in the groundwater samples collected from the
monitoring wells and the presence of numerous water-supply wells within 1,500 feet of the site.
Progress was contracted by McLeod Oil Company to collect groundwater samples from select
existing monitoring wells to evaluate the effectiveness of remedial efforts.
C FIELD ACTIVITIES
MMPE EVENTS
Progress conducted a MMPE event at the subject site from April 29 to May 3, 2013. The work
was pre-authorized for Trust Fund reimbursement by the Raleigh Regional Office-UST Section of
NCDEQ.
Progress extracted fluids and vapors from monitoring wells MW-1 and MW-14. Approximately
4,764 gallons of contaminated groundwater were removed from the extraction wells. Based on
mass removal calculations, Progress estimates that approximately 161.081 pounds (25.8 gallons)
of petroleum product were recovered (as emissions) during the MMPE event.
Progress conducted a second MMPE event at the subject site from September 23 to September 27,
2013. The work was pre-authorized for Trust Fund reimbursement by the Raleigh Regional
Office-UST Section of NCDEQ
Progress extracted fluids and vapors from monitoring wells MW-1 and MW-14. Approximately
6,708 gallons of contaminated groundwater were removed from the extraction wells. Based on
mass removal calculations, Progress estimates that approximately 124.15 pounds (19.9 gallons) of
petroleum product were recovered (as emissions) during the MMPE event.
Progress conducted a third MMPE event at the subject site from October 21 to October 25, 2013.
The work was pre-authorized for Trust Fund reimbursement by the Raleigh Regional Office-UST
Section of NCDEQ
Active Remediation Monitoring Report (Subsequent) January 20, 2016
Duncan’s Mini Mart, Roxboro, North Carolina Progress Project 1015148.001
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Progress extracted fluids and vapors from monitoring wells MW-1 and MW-14. Approximately
5,115 gallons of contaminated groundwater were removed from the extraction wells. Based on
mass removal calculations, Progress estimates that approximately 148.829 pounds (23.8 gallons)
of petroleum product were recovered (as emissions) during the MMPE event.
Progress conducted a fourth MMPE event at the subject site from December 2 to December 7,
2013. The work was pre-authorized for Trust Fund reimbursement by the Raleigh Regional
Office-UST Section of NCDEQ
Progress extracted fluids and vapors from monitoring wells MW-1 and MW-14. Approximately
3,786 gallons of contaminated groundwater were removed from the extraction wells. Based on
mass removal calculations, Progress estimates that approximately 133.537 pounds.
Progress conducted a fifth MMPE event at the subject site from March 16 to March 20, 2015. The
work was pre-authorized for Trust Fund reimbursement by the Raleigh Regional Office-UST
Section of NCDEQ
Progress extracted fluids and vapors from monitoring wells MW-1, MW-2, and MW-14.
Approximately 4,109 gallons of contaminated groundwater were removed from the extraction
wells. Based on mass removal calculations, Progress estimates that approximately 150.018 pounds
(24.0 gallons) of petroleum product were recovered (as emissions) during the MMPE event.
Progress measured stack velocity using an averaging Pitot tube installed across the two-inch
liquid-ring pump vapor discharge stack to determine flow in actual cubic feet per minute (ACFM).
For the purposes of our calculations we assume an average velocity through the system of 3,000
feet per minute. Progress employed the following equation to convert ACFM to standard cubic
feet per minute (SCFM):
SCFM=ACFM(TSTP / TActual)( PActual /PSTP)
TSTP - Standard temperature (68oF = 528oR)
TActual - Actual temperature (stack conditions (0F) +460oR)
PActual - Actual pressure (stack conditions - observed gauge value in inches of water)
PSTP - Standard pressure (29.92 inches of Hg = 646 inches of water)
The conversion equation was employed to correct the laboratory-reported vapor data for the stack
discharge temperature. The average liquid ring pump (LRP) stack temperature measured was
incorporated into the above equation to yield a correction factor applied to the data to calculate a
mass removal in vapor-phase. Average stack temperature, average vacuum applied, and airflow
effluent data were recorded.
GROUNDWATER INVESTIGATION
Progress collected groundwater samples from monitoring wells MW-1 through MW-8, MW-10,
MW-11, MW-14, and DW-1 on November 11, 2015, Figure 3. Prior to sampling, the depth-to-
groundwater from the top of each well casing was measured in the monitoring wells using an
electric water level and oil/water interface indicator. The meter was decontaminated between uses
according to the following procedure:
Active Remediation Monitoring Report (Subsequent) January 20, 2016
Duncan’s Mini Mart, Roxboro, North Carolina Progress Project 1015148.001
4
• washed with potable water and phosphate-free detergent solution;
• rinsed with potable water; and
• rinsed with distilled water.
The wells were purged by bailing an equivalent of three volumes of water from the monitoring wells
using a one-liter capacity disposable polypropylene bailer. The monitoring wells were then sampled
using the dedicated, disposable bailer for each well.
The monitoring well samples were decanted into laboratory-prepared containers. The sample
containers were labeled with identifying numbers and information, preserved on ice, and delivered
under chain-of-custody to Research & Analytical Laboratories, Inc. (R&A) in Kernersville, North
Carolina for analysis for volatile organic compounds using Standard Method 6200B, plus methyl-tert
butyl ether (MTBE) and isopropyl ether (IPE).
The depth-to-groundwater measurements were converted to relative groundwater elevations and are
presented in Table B-7. Based on the groundwater data collected during the November 2015
sampling event, the groundwater beneath the site appears to be flowing generally to the southeast.
The relative groundwater elevations calculated during the November 2015 sampling event are
depicted on Figure 5.
D LABORATORY RESULTS
R&A analyzed the groundwater samples for volatile organic compounds (VOCs) by Standard
Method 6200B including methyl tert-butyl ether (MTBE) and isopropyl ether (IPE). A summary
of the groundwater analytical results is presented in Table B-4 and on Figure 4.
Laboratory analysis of the groundwater sample collected from monitoring well MW-1
detected benzene (5,100 µg/L), ethylbenzene (2,280 µg/L), MTBE (500 µg/L),
naphthalene (715 µg/L), n-propylbenzene (300 µg/L), toluene (23,800 µg/L), 1,2,4-
trimethylbenzene (2,430 µg/L), 1,3,5-trimethylbenzene (618 µg/L), and total xylenes
(10,400 µg/L) at concentrations that exceed their respective NC2LGWQS, with its
concentration of benzene exceeding the applicable Gross Contamination Level (GCL).
Laboratory analysis of the groundwater sample collected from monitoring well MW-2
detected benzene (8,080 µg/L), ethylbenzene (2,060 µg/L), MTBE (8,890 µg/L),
naphthalene (520 µg/L), n-propylbenzene (250 µg/L), toluene (52,700 µg/L), 1,2,4-
trimethylbenzene (2,060 µg/L), 1,3,5-trimethylbenzene (480 µg/L), and total xylenes
(9,850 µg/L) at concentrations that exceed their respective NC2LGWQS, with the
concentration of benzene exceeding its GCL.
Laboratory analysis of the groundwater sample collected from monitoring well MW-3
detected benzene (881 µg/L), ethylbenzene (1,090 µg/L), 2-hexanone (250 µg/L), MTBE
(596 µg/L), naphthalene (413 µg/L), n-propylbenzene (176 µg/L), toluene (14,600 µg/L),
1,2,4-trimethylbenzene (1,580 µg/L), 1,3,5-trimethylbenzene (504 µg/L), and total xylenes
(5,600 µg/L) at concentrations that exceed their respective NC2LGWQS; however, none
of targeted compounds were detected at concentrations that exceed the applicable GCLs.
Active Remediation Monitoring Report (Subsequent) January 20, 2016
Duncan’s Mini Mart, Roxboro, North Carolina Progress Project 1015148.001
5
Laboratory analysis of the groundwater sample collected from monitoring well MW-4
detected 1,2-dichloroethane (142 µg/L), benzene (323 µg/L), MTBE (7,540 µg/L), IPE
(103 µg/L), and naphthalene (48.0 µg/L) at concentrations that exceed their respective
NC2LGWQS; however, none of targeted compounds were detected at concentrations that
exceed the applicable GCLs.
Laboratory analysis of the groundwater sample collected from monitoring well MW-14
detected benzene (3,690 µg/L), ethylbenzene (1,510 µg/L), MTBE (650 µg/L),
naphthalene (545 µg/L), n-propylbenzene (250 µg/L), toluene (39,200 µg/L), 1,2,4-
trimethylbenzene (2,110 µg/L), 1,3,5-trimethylbenzene (575 µg/L), and total xylenes
(8,300 µg/L) at concentrations that exceed their respective NC2LGWQS; however, none
of targeted compounds were detected at concentrations that exceed the applicable GCLs.
Laboratory analysis of the groundwater sample collected from monitoring well DW-1 did
not detect targeted compounds above the NC2LGWQS.
A copy of the laboratory data sheets and chain-of-custody record is included in the Appendix.
E CONCLUSIONS
Based on the results of this assessment, Progress concludes the following:
Laboratory analysis of groundwater samples collected from monitoring wells MW-1
through MW-4 and MW-14 detected targeted compounds at concentrations that exceed
their respective NC2LGWQS. Laboratory analysis also detected benzene at concentrations
that exceed its GCL in the groundwater samples collected from monitoring wells MW-1
and MW-2. Since the implementation of remedial efforts free product has not been
measured in the site monitoring wells.
The petroleum-related compounds detected in the groundwater samples collected from
monitoring wells MW-1, MW-2, and MW-14 during this sampling event and following a
series of MMPE events generally exhibit an overall decrease as compared to the previous
sampling event. Note that Progress extracted fluids and vapors from monitoring wells
MW-1, MW-2, and MW-14 during the March 2015 MMPE event. It appears that the
MMPE events reduced the dissolved-phase contamination in the groundwater in the
vicinity of the extraction wells.
The petroleum-related compounds detected in the groundwater samples collected from
monitoring wells MW-3 and MW-4 during this sampling event and following a series of
MMPE events generally exhibit general increase as compared to the previous sampling
event. It appears that the MMPE events may have promoted migration of dissolved-phase
contamination in the groundwater back toward the source area.
Based on this groundwater sampling event, the previous MMPE events, initiated in 2013,
have been successful at removing free product from the vicinity of monitoring well MW-
14. In addition, contaminant concentrations detected in the groundwater samples
collected from monitoring wells MW-1, MW-2, MW-3, and MW-4 have been reduced as
follows:
Active Remediation Monitoring Report (Subsequent) January 20, 2016
Duncan’s Mini Mart, Roxboro, North Carolina Progress Project 1015148.001
6
Benzene has been reduced in the groundwater sample collected from monitoring well
MW-1 by 62% as compared to the highest concentration (13,283 µg/L) detected in January
2003.
Benzene has been reduced in the groundwater sample collected from monitoring well
MW-2 by 31% as compared to the highest concentration (11,764 µg/L) detected in January
2003.
Benzene has been reduced in the groundwater sample collected from monitoring well
MW-3 by 43% as compared to the highest concentration (2,660 µg/L) detected in October
2008.
Benzene has been reduced in the groundwater sample collected from monitoring well
MW-4 by 36% as compared to the highest concentration (223 µg/L) detected in October
2011.
Benzene has been reduced in the groundwater sample collected from monitoring well
MW-14 (which formerly contained free product) by 44% as compared to the highest
concentration (6,560 µg/L) detected in May 2013.
F RECOMMENDATIONS
Based on the results of this assessment, Progress recommends the following:
Implement additional MMPE events to continue to reduce the dissolved-phase
contamination in the groundwater beneath the site. Following the completion of each
MMPE event, a groundwater sampling event should be completed to determine whether
the MMPE event was an effective remedial alternative for the removal of free product
and/or dissolved-phase petroleum contamination.
Based on access limitations and to aid in the removal of the impacted groundwater at the
site, it may be beneficial to install remote extraction points or manifold the existing
monitoring well network to facilitate groundwater remedial efforts and still allow
groundwater monitoring activities.
No further work will be performed pending pre-approval from the Raleigh Regional Office
of the NCDEQ-UST Section.
G QUALIFICATIONS OF REPORT
The activities and evaluative approaches used in this assessment are consistent with those normally
employed in assessment projects of this type. Our evaluation of site conditions has been based on
our understanding of the site project information and the data obtained during our field activities.
H FIGURES
Figure 1
Topographic Site Map
Duncan’s Mini Mart
1909 Burlington Road
Roxboro, North Carolina
P.O. Box 5884
Winston-Salem, NC 27113
Telephone: [phone]
Fax: [phone]
www.progressenvironmental.com
Hurdle Mills, N.C.
United States Department of the Interior
United States Geological Survey
7.5 Minute Series Topographic Map
Contour Interval: 10 feet
Scale: 1”=2000’
Date: 1968
Project: Duncan’s Mini Mart
Client: McLeod Oil
Progress Job #: 1015148.001
Date: January 2016
SITE
SITE
JAN2016
0'100'
REV
0
DRAWINGTITLE
DRAWINGNUMBER
BY DATEREV
DR.: JTR
CK.:
APP'D.:
SCALE: 1"=100'
GRAPHICSCALE
100'200'
PROGRESSNO.: 1015148.001
1"=100'
www.progressenvironmental.com %db("MAG-DATE")Figure2
120FayetteStreetWinston-Salem, NorthCarolina27101(336)722-9999
Progress
Environmental,Inc.
SiteMapDuncan'sMini Mart1909BurlingtonRoadRoxboro, NorthCarolina
SITE
LEGEND
SITE
0'100'
GRAPHICSCALE
100'200'
1"=100'
SITEBURLINGTONROAD
B
URLI
N
GT
ONHAL
L
RO
ADVANCEWRENNROADMW-1 MONITORING WELL LOCATION
WATER SUPPLY WELLLOCATION
MW-6
MW-7
MW-10
MW-11
MW-8
MW-9
MW-12
MW-13
MW-5
MW-4
MW-2
MW-1
MW-14
MW-3
DW-1
DW-1
TYPE III WELLLOCATION
FENCE
APPROXIMATE PROPERTY BOUNDARY
RESIDENCE OR STRUCTURE
Progress
ENVIRONMENTAL, INC.
JSL
1015148.001
JAN 2016
JTR
SHOWN
JAN 2016
Figure 3.SKF
P.O. Box 5884WINSTON-SALEM, NORTH CAROLINA 27113PHONE [phone] FAX [phone]
FIGURE 3MONITORINGWELLLOCATIONMAPDUNCAN'SMINI MART1909 BURLINGTONROAD
ROXBORO, NORTH CAROLINA%db("MAG-DATE")PROJECT
CHECKED BY
DRAWN BY
FILE NAME
SCALE
DATE
DATE
0'100'
GRAPHICSCALE
100'200'
1"=100'
SITEBURLINGTONROAD
B
URLI
N
GT
ONHAL
L
RO
ADVANCEWRENNROADMW-6 MONITORING WELL LOCATION BQL
WATER SUPPLY WELLLOCATION
MW-6
MW-7
MW-10
MW-11
MW-8
MW-9
(NF)
MW-12
(NF)
MW-13(Aban.)
MW-5
MW-4
MW-2
MW-1
MW-14
MW-3
DW-1
DW-1
TYPE III WELL LOCATION
FENCE
APPROXIMATE PROPERTY BOUNDARY
RESIDENCE OR STRUCTURE
MW-1 MONITORING WELL LOCATIONABOVE GCLs
MW-3 MONITORING WELL LOCATIONABOVE 2LSTANDARDS
BUT BELOW THE GCLs
Progress
ENVIRONMENTAL, INC.
JSL
1015148.001
JAN 2016
JTR
SHOWN
JAN 2016
Figure 4.SKF
P.O. Box 5884WINSTON-SALEM, NORTH CAROLINA 27113PHONE [phone] FAX [phone]
FIGURE 4GROUNDWATERANALYTICAL
RESULTSMAP
DUNCAN'SMINI MART1909 BURLINGTONROADROXBORO, NORTH CAROLINA%db("MAG-DATE")PROJECT
CHECKED BY
DRAWN BY
FILE NAME
SCALE
DATE
DATE
0'100'
GRAPHICSCALE
100'200'
1"=100'
SITE
MW-1 MONITORING WELL LOCATIONAND GROUNDWATER ELEVATION
WATER SUPPLY WELLLOCATION
DW-1 TYPE III WELL LOCATION
FENCE
APPROXIMATE PROPERTY BOUNDARY
RESIDENCE OR STRUCTURE
GROUNDWATER CONTOUR
GROUNDWATER CONTOUR ELEVATION
CALCULATED GROUNDWATER FLOW DIRECTION
GROUNDWATER CONTOUR INTERVAL
Progress
ENVIRONMENTAL, INC.
JSL
1015148.001
JAN 2016
JTR
SHOWN
JAN 2016
Figure 5.SKF
P.O. Box 5884WINSTON-SALEM, NORTH CAROLINA 27113PHONE [phone] FAX [phone]
FIGURE 5GROUNDWATERFLOWDIRECTIONMAPDUNCAN'SMINI MART1909 BURLINGTONROAD
ROXBORO, NORTH CAROLINA%db("MAG-DATE")BURLINGTONROADB
URLI
N
GT
ONHAL
L
RO
ADVANCEWRENNROADMW-6
MW-7 MW-10
MW-11
MW-8
MW-9
(NM)
MW-12
(NM)
MW-13
MW-5
PROJECT
CHECKED BY
DRAWN BY
FILE NAME
SCALE
DATE
DATE
628.00
0.10 ft.
Note: MW-14 was not used for the determination of groundwater flow direction.
(624.78)
(624.86)
(631.82)
(623.62)
(624.51)
(Aban.)
(627.82)
(632.14)
625.00
MW-3(624.67)
MW-14(NM)
(624.69)
MW-2(624.57)
MW-4
(624.42)
MW-1DW-1
624.50
624.00
I TABLES
ID Date Well Screened Well Well Depth of Product Groundwater
Number Installed Depth Interval Diameter Elevation Groundwater Thickness Elevation
(feet TOC) (feet TOC) (inches) (feet TOC) (feet TOC) (feet) (feet TOC)
11/11/2015 11/11/2015
MW-1 11/14/2001 35 15-35 2 649.22 24.53 N/a 624.69
MW-2 11/15/2001 35 15-35 2 649.49 24.92 N/a 624.57
MW-3 3/13/2002 40 20-40 2 649.39 24.72 N/a 624.67
MW-4 3/13/2002 40 20-40 2 649.32 24.90 N/a 624.42
MW-5 1/20/2003 35 10-35 2 643.41 18.90 N/a 624.51
MW-6 1/21/2003 40 6-40 2 648.94 24.16 N/a 624.78
MW-7 1/22/2003 40 15-40 2 649.75 24.89 N/a 624.86
MW-8 1/22/2003 40 15-40 2 640.88 17.26 N/a 623.62
MW-9 1/22/2003 35 6-35 2 636.18 Not Found N/a Not Found
MW-10 1/22/2003 40 10-40 2 650.05 17.91 N/a 632.14
MW-11 1/21/2003 40 10-40 2 648.62 16.80 N/a 631.82
MW-12 2/12/2003 35 10-35 2 634.10 Not Found N/a Not Found
MW-13 2/12/2003 35 10-35 2 636.20 Abandoned N/a Abandoned
MW-14 7/31/2003 45 3-45 6 -- 24.25 N/a NM
*DW-1 3/18/2002 90 85-90 2 649.75 25.07 N/a 624.68
* -- Monitoring well DW-1 is a deep Type III monitoring well and was not used for the determination of groundwater elevation contours.
N/a -- Not Applicable. Product was not present in the monitoring wells.
Information obtained from Fuss & O'Neill, Inc.: Pre-Cap Groundwater Monitoring Report, dated October 2003
TABLE B-7
MONITORING WELL CONSTRUCTION INFORMATION
DUNCAN'S MINI MART
TABLE B-4
DUNCAN'S MINI MART
SUMMARY OF DETECTED GROUNDWATER ANALYTICAL RESULTS
ACTIVE REMEDIATION MONITORING REPORT
504.1
Lead by
Standard
Method3030C
Well ID DTW
(From TOC)Date Collected
31.68 11/26/2001 <1,000 6,430 2,241 NA NA NA NA 28,824 9,748 1,485 <1,000 NA NA 339 NA NA NA NA BQL NA NA NA NA NA NA <1 9 <5
27.39 1/27/2003 <2,000 13,283 2,740 NA NA NA NA 47,313 12,331 2,383 <2,000 NA NA 269 NA NA NA NA BQL NA NA NA NA NA NA <1 -- <5
19.17 8/12/2003 --7,708 2,060 NA NA NA NA 23,138 9,620 4,766 171 NA NA 632 NA NA NA NA BQL NA NA NA NA NA NA <1 83 --
19.51 9/4/2003 --9,630 1,904 NA NA NA NA 29,064 9,031 3,700 160 NA NA 532 NA NA NA NA BQL NA NA NA NA NA NA <1 79 --
28.11 10/14/2008 <1 11,400 3,170 NA NA NA NA 40,800 10,300 <5 <5 NA NA NA NA NA NA NA BQL NA NA NA NA NA NA <1 NA NA
29.60 10/27/2011 BQL 10,600 2,430 BQL BQL BQL 160 37,700 11,200 BQL 6.5J 100 BQL 550 33.3 280 BQL BQL BQL 2,200 508 BQL BQL BQL NA BQL NA NA
24.60 5/23/2013 BQL 7,890 1,890 BQL BQL BQL 148J 32,600 9,970 1,940 BQL 70J BQL 540 37.5J 238 BQL BQL BQL 2,180 598 BQL BQL BQL 4,370J BQL NA NA
25.10 1/8/2014 BQL 8,030 2,390 BQL BQL BQL BQL 35,200 12,700 2,370 BQL BQL BQL 560 BQL 250J BQL BQL BQL 2,590 680 BQL BQL BQL BQL BQL NA NA
21.40 4/23/2015 BQL 5,410 2,070 BQL BQL BQL BQL 33,000 12,200 1,750 BQL BQL BQL 1,190 BQL BQL BQL BQL BQL 2,810 690 BQL BQL BQL BQL BQL NA NA
24.53 11/11/2015 BQL 5,100 2,280 BQL BQL BQL BQL 23,800 10,400 500 BQL BQL BQL 715 BQL 300 BQL BQL BQL 2,430 618 BQL BQL BQL BQL BQL NA NA
31.76 11/26/2001 <2,000 10,168 2,568 NA NA NA NA 69,256 11,178 6,301 <2,000 NA NA 280 NA NA NA NA BQL NA NA NA NA NA NA <1 1.6 10
27.67 1/27/2003 <2,000 11,764 2,605 NA NA NA NA 75,998 11,245 9,002 <2,000 NA NA 236 NA NA NA NA BQL NA NA NA NA NA NA <1 -- <5
19.45 8/12/2003 --10,300 2,184 NA NA NA NA 54,500 9,938 8,600 491 NA NA 616 NA NA NA NA BQL NA NA NA NA NA NA <1 <50 --
19.75 9/4/2003 --11,300 2,170 NA NA NA NA 54,400 9,896 8,050 <50 NA NA 465 NA NA NA NA BQL NA NA NA NA NA NA <1 <50 --
28.36 10/14/2008 <1 10,900 5,050 NA NA NA NA 72,100 14,100 <5 <5 NA NA NA NA NA NA NA BQL NA NA NA NA NA NA <1 NA NA
29.74 10/27/2011 BQL 11,000 2,350 BQL BQL 1,680 290 69,700 11,000 8,040 33.3 99.8 127 535 BQL 280 21.8 BQL BQL 2,150 524 BQL BQL BQL NA BQL NA NA
24.95 5/23/2013 BQL 11,600 2,470 BQL BQL BQL BQL 88,100 11,400 12,800 50J 90J BQL 580 BQL 310 BQL BQL BQL 2,340 605 BQL BQL BQL 52,300 BQL NA NA
25.52 1/8/2014 BQL 9,580 2,420 BQL BQL BQL BQL 84,900 12,200 10,500 BQL BQL BQL 480J BQL 260J BQL BQL BQL 2,590 680 BQL BQL BQL 41,800J BQL NA NA
21.38 4/23/2015 BQL 9,900 2,260 BQL BQL BQL BQL 72,300 10,600 7,640 BQL BQL BQL 415 BQL 265 BQL BQL BQL 2,050 550 BQL BQL BQL BQL BQL NA NA
24.92 11/11/2015 BQL 8,080 2,060 BQL BQL BQL BQL 52,700 9,850 8,890 BQL BQL BQL 520 BQL 250 BQL BQL BQL 2,060 480 BQL BQL BQL BQL BQL NA NA
30.28 3/26/2002 <1,000 1,554 3,552 NA NA NA NA 57,427 15,341 <1,000 <1,000 NA NA 1,269 NA NA NA NA BQL NA NA NA NA NA NA <1 0.30 46
27.52 1/27/2003 <2,000 <2,000 3,600 NA NA NA NA 49,417 15,790 <2,000 <2,000 NA NA 881 NA NA NA NA BQL NA NA NA NA NA NA <1 -- <5
19.26 8/12/2003 --560 1,496 NA NA NA NA 14,908 5,699 134 78 NA NA 485 NA NA NA NA BQL NA NA NA NA NA NA <1 <10 --
19.55 9/4/2003 --1,399 2,017 NA NA NA NA 32,980 8,854 <10 160 NA NA 521 NA NA NA NA BQL NA NA NA NA NA NA <1 <10 --
28.25 10/14/2008 <1 2,660 3,950 NA NA NA NA 32,500 10,400 <5 <5 NA NA NA NA NA NA NA BQL NA NA NA NA NA NA <1 NA NA
29.54 10/27/2011 BQL 619 2,940 BQL BQL BQL 545 31,800 13,500 BQL BQL 159 BQL 786 BQL 469 39.8 BQL BQL 3,730 797 BQL BQL BQL NA BQL NA NA
24.66 5/23/2013 BQL 41J 62 BQL BQL BQL BQL 522 425 BQL BQL BQL BQL 30J BQL 24J BQL BQL 188 274 115 BQL BQL BQL BQL BQL NA NA
25.38 1/8/2014 BQL 1.12 1.85 BQL BQL BQL BQL 20.4 23.5 BQL BQL BQL BQL 0.61 BQL 0.25J BQL BQL BQL 7.51 2.85 BQL BQL BQL BQL BQL NA NA
21.25 4/23/2015 BQL 6.6 25.6 BQL BQL BQL BQL 58.2 107 BQL BQL 2.8 BQL 10.1 BQL 7.7 BQL BQL BQL 81.8 15.3 BQL BQL BQL BQL BQL NA NA
24.72 11/11/2015 BQL 881 1,090 BQL BQL BQL 225 14,600 5,600 596 BQL 57 BQL 413 BQL 176 19.5 BQL BQL 1,580 504 BQL BQL BQL BQL BQL NA NA
30.40 3/26/2002 35 297 <20 NA NA NA NA 56 221 53 21 NA NA <10 NA NA NA NA BQL NA NA NA NA NA NA <1 10.3 11
26.57 1/27/2003 <50 1,143 <50 NA NA NA NA <50 282 59 <50 NA NA 31 NA NA NA NA BQL NA NA NA NA NA NA <1 -- <5
19.46 8/12/2003 --477 <1 NA NA NA NA 3.7 70.4 17 9.9 NA NA 38 NA NA NA NA BQL NA NA NA NA NA NA <1 1.9 --
19.71 9/4/2003 --454 <1 NA NA NA NA 3.7 78.9 79 13 NA NA 28 NA NA NA NA BQL NA NA NA NA NA NA <1 4.4 --
28.30 10/14/2008 <1 2,910 186 NA NA NA NA 142 563 2,130 <5 NA NA NA NA NA NA NA BQL NA NA NA NA NA NA <1 NA NA
29.68 10/27/2011 223 2,790 63.2 3.14 8.0 BQL BQL 9.29 122 4,490 120 79.9 BQL 175 BQL 27.4 3.42 9.0 BQL 18.1 BQL BQL BQL BQL NA BQL NA NA
24.87 5/23/2013 148 540 671 2.1J 3.2J BQL BQL BQL 101 5,990 83.6 42 BQL 52.5 BQL 17.3 2.20J 6.80 8.2 30.7 6.4 BQL BQL 1.6J 7,620 BQL NA NA
25.52 1/8/2014 211 1,160 71.0 BQL BQL BQL BQL BQL 86.0 8,530 107 52.0 BQL 81.0 BQL 21.0J BQL BQL BQL 33.0J BQL BQL BQL BQL 8,210 BQL NA NA
21.37 4/23/2015 101 43.2 BQL BQL BQL BQL BQL BQL BQL 4,610 63.2 18.5 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL NA NA
24.90 11/11/2015 142 323 11.7 BQL 2.75 BQL BQL 2.90 19.1 7,540 103 42.3 BQL 48.0 BQL 12.1 BQL 6.05 6.50 10.3 10.9 BQL BQL BQL BQL BQL NA NA
21.64 1/27/2003 <1 1.2 <1 NA NA NA NA 6 <3 2 <1 NA NA <10 NA NA NA NA BQL NA NA NA NA NA NA <1 <10 <5
14.08 9/4/2003 -- <1 <1 NA NA NA NA <1 <3 <1 <1 NA NA <1 NA NA NA NA BQL NA NA NA NA NA NA <1 <1 --
22.38 10/14/2008 <1 <1 <1 NA NA NA NA <1 <1 <5 <5 NA NA NA NA NA NA NA BQL NA NA NA NA NA NA <1 NA NA
24.04 10/27/2011 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL NA 0.59 NA NA
18.90 11/11/2015 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL NA NA
26.49 1/27/2003 <1 <1 <1 NA NA NA NA <1 <3 <1 <1 NA NA <10 NA NA NA NA BQL NA NA NA NA NA NA <1 <10 <5
18.63 9/4/2003 -- <1 <1 NA NA NA NA <1 <3 <1 <1 NA NA <1 NA NA NA NA BQL NA NA NA NA NA NA <1 <1 --
27.72 10/14/2008 <1 <1 <1 NA NA NA NA <1 <1 <5 <5 NA NA NA NA NA NA NA BQL NA NA NA NA NA NA <1 NA NA
29.10 10/27/2011 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL NA BQL NA NA
24.16 11/11/2015 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL NA NA
0.4 1 600 6 7 4,000 40 600 500 20 70 70 NE 6 0.02 70 25 70 70 400 400 70 0.7 3 40 70 0.02 15
400 5,000 84,500 6,000 7,000 4,000,000 40,000 260,000 85,500 20,000 70,000 25,000 NE 6,000 50 30,000 11,700 6,900 8,500 28,500 25,000 70,000 700 3,000 40,000 70,000 50 15,000
= Values are those that exceed the North Carolina 2L Groundwater Quality Standard (NC2LGWQS)
= Values are those that exceed the Gross Contaminant Levels
NA -- Not Analyzed
NS -- Not Sampled
NF -- Not Found
NE -- Not Established
BQL -- Below Quantitation Limits
Analytical Method
Contaminant of Concern
EDBLeadBenzeneIsopropyletherNaphthaleneMethyltert-butyletherTolueneXylenesEthylbenzeneEDB2-HexanoneI-Propylbenzene1,1-Dichloroethane1,1-DichloroetheneVOCs by USEPA Method 601/602 or Standard Method 6200B
Chloroform1,3,5-Trimethylbenzene2-Butanone4-Methyl-2-Pentanonep-Isopropyltoluenen-Butylbenzenen-Propylbenzene1,2,4-TrimethylbenzeneMW-2
MW-3
NC2LGWQS (ug/L)
GCLs (ug/L)
Information prior to 2008 obtained from Fuss & O'Neill, Inc.: Pre-Cap Groundwater Monitoring Report, dated October 2003 Trichloroethenecis-1,2-DichloroetheneTetrachloroetheneMW-1
MW-4
MW-5
MW-6 Tert-amylAlcoholsec-Butylbenzene1,2-Dichloroethane
TABLE B-4
DUNCAN'S MINI MART
SUMMARY OF DETECTED GROUNDWATER ANALYTICAL RESULTS
ACTIVE REMEDIATION MONITORING REPORT
504.1
Lead by
Standard
Method
3030C
Well ID DTW
(From TOC)Date Collected
Analytical Method
Contaminant of Concern
EDBLeadBenzeneIsopropyletherNaphthaleneMethyltert-butyletherTolueneXylenesEthylbenzeneEDB2-HexanoneI-Propylbenzene1,1-Dichloroethane1,1-DichloroetheneVOCs by USEPA Method 601/602 or Standard Method 6200B
Chloroform1,3,5-Trimethylbenzene2-Butanone4-Methyl-2-Pentanonep-Isopropyltoluenen-Butylbenzenen-Propylbenzene1,2,4-TrimethylbenzeneTrichloroethenecis-1,2-DichloroetheneTetrachloroetheneTert-amylAlcoholsec-Butylbenzene1,2-Dichloroethane27.40 1/27/2003 <1 <1 <1 NA NA NA NA <1 <3 <1 <1 NA NA <10 NA NA NA NA BQL NA NA NA NA NA NA <1 <10 <5
19.70 9/4/2003 -- <1 <1 NA NA NA NA <1 <3 <1 <1 NA NA <1 NA NA NA NA BQL NA NA NA NA NA NA <1 <1 --
28.51 10/14/2008 <1 <1 <1 NA NA NA NA <1 <1 <5 <5 NA NA NA NA NA NA NA BQL NA NA NA NA NA NA 2.8 NA NA
29.97 10/27/2011 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL 0.23J BQL BQL BQL BQL BQL BQL BQL BQL BQL NA 1.84 NA NA
25.00 5/23/2013 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL 1.5 NA NA
24.89 11/11/2015 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL NA NA
21.11 1/27/2003 <1 <1 <1 NA NA NA NA <1 <3 <1 <1 NA NA <10 NA NA NA NA BQL NA NA NA NA NA NA <1 <10 <5
14.28 9/4/2003 -- <1 <1 NA NA NA NA <1 <3 <1 <1 NA NA <1 NA NA NA NA BQL NA NA NA NA NA NA <1 <1 --
21.54 10/14/2008 <1 <1 <1 NA NA NA NA <1 <1 <5 <5 NA NA NA NA NA NA NA BQL NA NA NA NA NA NA <1 NA NA
25.57 10/27/2011 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL NA BQL NA NA
17.26 11/11/2015 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL NA NA
16.35 1/27/2003 <10 49 105 NA NA NA NA 405 408 <10 <10 NA NA 22 NA NA NA NA BQL NA NA NA NA NA NA <1 0.061 <5
9.59 9/4/2003 -- <1 <1 NA NA NA NA <1 <3 <1 <1 NA NA <1 NA NA NA NA BQL NA NA NA NA NA NA <1 <1 --
Not Found 10/14/2008 NF NF NF NF NF NF NF NF NF NF NF NF NF NF NF NF NF NF BQL NF NF NF NF NF NA NF NF NF
Not Found 10/27/2011 NF NF NF NF NF NF NF NF NF NF NF NF NF NF NF NF NF NF BQL NF NF NF NF NF NA NF NF NF
19.62 1/27/2003 <1 <1 <1 NA NA NA NA <1 <3 <1 <1 NA NA <10 NA NA NA NA BQL NA NA NA NA NA NA <1 <0.02 <5
12.21 9/4/2003 -- <1 <1 NA NA NA NA <1 <3 <1 <1 NA NA <1 NA NA NA NA BQL NA NA NA NA NA NA <1 <1 --
22.19 10/14/2008 <1 <1 <1 NA NA NA NA <1 <1 <5 <5 NA NA NA NA NA NA NA BQL NA NA NA NA NA NA <1 NA NA
23.36 10/27/2011 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL NA BQL NA NA
17.91 11/11/2015 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL NA NA
18.58 1/27/2003 <1 <1 <1 NA NA NA NA <1 <3 <1 <1 NA NA <10 NA NA NA NA BQL NA NA NA NA NA NA <1 <10 <5
11.49 9/4/2003 -- <1 <1 NA NA NA NA <1 <3 <1 <1 NA NA <1 NA NA NA NA BQL NA NA NA NA NA NA <1 <1 --
21.40 10/14/2008 <1 <1 <1 NA NA NA NA <1 <1 <5 <5 NA NA NA NA NA NA NA BQL NA NA NA NA NA NA <1 NA NA
22.75 10/27/2011 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL 0.43J 1.88 0.18J NA BQL NA NA
17.88 5/23/2013 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL 0.29J BQL BQL BQL NA NA
16.80 11/11/2015 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL NA NA
15.72 2/13/2003 <1 <1 <1 NA NA NA NA <1 <1 <1 <1 NA NA <5.4 NA NA NA NA BQL NA NA NA NA NA NA <1 <0.019 31
11.24 9/4/2003 -- <1 <1 NA NA NA NA <1 <3 <1 <1 NA NA <1 NA NA NA NA BQL NA NA NA NA NA NA <1 <1 --
Not Found 10/14/2008 NF NF NF NA NA NA NA NF NF NF NF NA NA NF NA NA NA NA BQL NA NA NA NA NA NA <1 NF NF
Not Found 10/27/2011 NF NF NF NF NF NF NF NF NF NF NF NF NF NF NF NF NF NF BQL NF NF NF NF NF NA NF NF NF
15.20 2/13/2003 <1 <1 <1 NA NA NA NA <1 <1 <1 <1 NA NA <5.4 NA NA NA NA BQL NA NA NA NA NA NA <1 <0.019 8
8.41 9/4/2003 -- <1 <1 NA NA NA NA <1 <3 <1 <1 NA NA <1 NA NA NA NA BQL NA NA NA NA NA NA <1 <1 --
17.57 10/14/2008 <1 <1 <1 NA NA NA NA <1 <1 <5 <5 NA NA NA NA NA NA NA BQL NA NA NA NA NA NA <1 NA NA
19.41 10/27/2011 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL NA BQL NA NA
NS 10/14/2008 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS BQL NS NS NS NS NS NA NS NS NS
-- 10/27/2011 FP FP FP FP FP FP FP FP FP FP FP FP FP FP FP FP FP FP BQL FP FP FP FP FP NA FP FP FP
24.35 5/23/2013 BQL 6,560 2,870 BQL BQL BQL BQL 70,100 13,200 2,650 BQL 130J BQL 730 BQL 490J BQL BQL BQL 3,630 900 BQL BQL BQL 9,110J BQL NA NA
24.94 1/8/2014 BQL 5,580 2,740 BQL BQL BQL BQL 78,100 13,700 3,730 BQL 100J BQL 760 BQL 440J BQL BQL BQL 3,980 970 BQL BQL BQL BQL BQL NA NA
24.94 1/8/2014 BQL 3,430 1,970 BQL BQL BQL BQL 45,100 10,700 930 BQL BQL BQL 695 BQL 390 BQL BQL BQL 3,280 895 BQL BQL BQL BQL BQL NA NA
24.25 11/11/2015 BQL 3,690 1,510 BQL BQL BQL BQL 39,200 8,300 650 BQL BQL BQL 545 BQL 250 BQL BQL BQL 2,110 575 BQL BQL BQL BQL BQL NA NA
30.75 3/26/2002 <1 8.6 <1 NA NA NA NA 2 10.4 <1 <1 NA NA <10 NA NA NA NA BQL NA NA NA NA NA NA <1 0.04 <5
27.90 1/27/2003 <1 <1 <1 NA NA NA NA <1 <3 <1 <1 NA NA <10 NA NA NA NA BQL NA NA NA NA NA NA <1 -- <5
20.24 9/4/2003 -- <1 <1 NA NA NA NA <1 <3 <1 <1 NA NA <1 NA NA NA NA BQL NA NA NA NA NA NA <1 <1 --
28.72 10/14/2008 <1 1 <1 NA NA NA NA 1.4 <1 <5 <5 NA NA NA NA NA NA NA BQL NA NA NA NA NA NA <1 NA NA
30.31 10/27/2011 BQL BQL BQL BQL BQL BQL BQL 0.38J 0.11J BQL BQL BQL BQL 0.43J BQL BQL BQL BQL BQL 0.15J BQL BQL BQL BQL NA BQL NA NA
21.65 1/8/2014 BQL BQL BQL BQL BQL BQL BQL 1.14 BQL 0.97 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL NA BQL NA NA
25.07 11/11/2015 BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL BQL NA NA
0.4 1 600 6 7 4,000 40 600 500 20 70 70 NE 6 0.02 70 25 70 70 400 400 70 0.7 3 40 70 0.02 15
400 5,000 84,500 6,000 7,000 4,000,000 40,000 260,000 85,500 20,000 70,000 25,000 NE 6,000 50 30,000 11,700 6,900 8,500 28,500 25,000 70,000 700 3,000 40,000 70,000 50 15,000
= Values are those that exceed the North Carolina 2L Groundwater Quality Standard (NC2LGWQS)
= Values are those that exceed the Gross Contaminant Levels
NA -- Not Analyzed
NS -- Not Sampled
NF -- Not Found
NE -- Not Established
BQL -- Below Quantitation Limits
MW-14
DW-1
MW-9
MW-8
MW-12
MW-13
MW-10
MW-11
Information prior to 2008 obtained from Fuss & O'Neill, Inc.: Pre-Cap Groundwater Monitoring Report, dated October 2003
GCLs (ug/L)
NC2LGWQS (ug/L)
MW-7
J APPENDIX