HomeMy WebLinkAboutWA-1039_12716_CA_RPTS_20160418_MRP
April 18, 2016
Mr. Bill Crew
North Carolina Department of Environmental Quality
Division of Waste Management, UST Section
Washington Regional Office
943 Washington Square Mall
Washington, NC 27889
Re.: Transmittal Letter
March 2016 Groundwater Monitoring Report
Town of Edenton Street Department
Groundwater Incident #12716
Solutions-IES Project No. 2016.0013.TEDE
Dear Mr. Crew:
Solutions-IES, Inc. (SIES), on behalf of the Town of Edenton, is submitting the enclosed March 2016
Groundwater Monitoring Report for your review and files. The report summarizes the groundwater
monitoring activities conducted in March 2016 at the Edenton Street Department location at 120 West
Hicks Street. If you have any questions or need additional information, please call us at (919) 873-1060.
Truly yours,
Solutions-IES
Michael W. Branson, P.G.
Project Manager
cc: Anne-Marie Knighton, Town of Edenton
Enclosure
MARCH 2016 GROUNDWATER MONITORING REPORT
TOWN OF EDENTON STREET DEPARTMENT
120 WEST HICKS STREET
EDENTON, CHOWAN COUNTY, NORTH CAROLINA
GROUNDWATER INCIDENT # 12716
RISK, RANK AND ABATEMENT SCORE: H65R
Prepared for:
Town of Edenton
PO Box 300
Edenton, NC 27932
Prepared by:
Solutions-IES, Inc.
1101 Nowell Road
Raleigh, North Carolina 27607
Solutions-IES Project No. 2016.0013.TEDE
April 18, 2016
Michael W. Branson, P.G. James Y. Joyner, II, RSM
Project Manager Senior Consultant
i
TABLE OF CONTENTS
1.0 INTRODUCTION AND SITE BACKGROUND ................................................................................ 1
2.0 MARCH GROUNDWATER SAMPLING EVENT ............................................................................ 2
2.1 GROUNDWATER ELEVATIONS ................................................................................................ 2
2.2 GROUNDWATER SAMPLING .................................................................................................... 2
2.3 GROUNDWATER MONITORING RESULTS .............................................................................. 3
3.0 CONCLUSIONS ............................................................................................................................... 3
4.0 REFERENCES ................................................................................................................................. 4
FIGURES
Figure 1 Site Location Map
Figure 2 Site Map
Figure 3 Shallow Groundwater Contour Map
Figure 4 Contaminant Concentration Map
TABLES
Table 1 Summary of Groundwater Elevation Data
Table 2 Summary of Groundwater Field Parameters
Table 3 Summary of Detected Compounds in Groundwater
Table 4 Summary of Historical Groundwater Analytical Results
APPENDICES
Appendix A Groundwater Sampling Logs
Appendix B Laboratory Analytical Report and Chain of Custody Record
March 2016 Groundwater Monitoring Report Solutions-IES Project No. 2016.0013.TEDE
Town of Edenton Street Department April 18, 2016
Edenton, Chowan County, NC
1
1.0 INTRODUCTION AND SITE BACKGROUND
Solutions-IES, Inc. (SIES), has prepared this March 2016 Groundwater Monitoring Report for the Town of
Edenton (Edenton) to document the groundwater conditions at the Street Department facility (Site)
located at 120 West Hicks Street in Edenton, Chowan County, North Carolina (Figure 1). This report
provides information pertaining to relative groundwater elevations and groundwater contaminant
concentrations.
The Site is an active maintenance facility for Edenton’s Street Department and is also the location of
Edenton’s solid waste transfer station. In January 1994, two underground storage tanks (USTs) were
removed from the Site, one 550-gallon diesel fuel tank and one 1,000-gallon gasoline tank. During the
UST removal, soil contamination was detected and a release of petroleum was confirmed (Spangler,
2005). Subsequently, an assessment was conducted and a Corrective Action Plan (CAP) was
developed that recommended monitored natural attenuation (MNA) as the remediation method. NCDEQ
approved the CAP in November 1998. In September 2004, the NCDEQ completed a Risk, Rank and
Abatement Ranking Form for the site and assigned the site a high groundwater risk with a score of H65R.
According to the rating form, the presence of a public water supply well within 1,000 feet of the source
area was the criterion causing the site to be classified as high risk. Other factors contributing to the
ranking included the potential for migration and the contaminant concentrations in the groundwater.
Following the groundwater monitoring event in April 2005, Edenton was advised that the NCDEQ
considered the Site a “non-directed” site, meaning further work and remedial efforts were not required
until it became a high enough priority to resume remedial activities. In a Notice of Regulatory
Requirements (NORR) dated February 25, 2015, the NCDEQ directed Edenton to resume groundwater
monitoring.
Five monitoring wells (MW-1 through MW-5) were installed at the site after the USTs were removed in
1994. Four of these wells were located during a May 2015, sampling event; however, well MW-4 was
buried under 1 to 1.5 feet of gravel and could not be located. Based on the sampling activities and
results, the NCDEQ issued an Acknowledgement of Groundwater Monitoring Report Receipt, which
required the following:
Re-install well MW-4;
Conduct a receptor survey update; and
Sample all monitoring wells, including new MW-4, and any water supply wells within 250 feet of
the contaminant plume as identified during the receptor survey.
In November 2015, SIES installed a replacement monitoring well, MW-4R. A receptor survey was
performed, which indicated that the site continued to be classified as high risk, based upon the presence
of a public water supply well in the vicinity.
March 2016 Groundwater Monitoring Report Solutions-IES Project No. 2016.0013.TEDE
Town of Edenton Street Department April 18, 2016
Edenton, Chowan County, NC
2
On November 18, 2015, SIES collected groundwater samples from five monitoring wells at the site (MW-1
through MW-3, MW-4R, and MW-5; Figure 2). The laboratory analytical results indicated that two
constituents, tetrachloroethene (PCE) and 1,2-dichloroethane (1,2-DCA) were reported at concentrations
above the 15A NCAC 2L Groundwater Standards (2L Standards). Based on these results, the NCDEQ
issued a NORR directing Edenton to “either file a Notice of Residual Petroleum (NRP) Contamination for
groundwater only, or resample all the monitoring wells using EPA Method 6200B and MADEP VPH and
EPH.” This monitoring report describes the activities related to the well resampling
2.0 MARCH GROUNDWATER SAMPLING EVENT
2.1 GROUNDWATER ELEVATIONS
Prior to collecting groundwater level measurements, SIES personnel opened each monitoring well to
allow the water level to equilibrate. SIES measured the depth-to-water (DTW) using an electronic water
level indicator and converted these measurements to elevations by subtracting the depth-to-water
measurement from the top-of-casing elevation that was referenced to a site datum with an assumed
elevation. When the replacement well was installed, SIES conducted a survey of all the monitoring wells
tying the top; of casing elevation to an assumed benchmark in order to provide an elevation for all the
wells from a consistent benchmark. Table 1 presents the March 2016 water level data with historical
water level measurements (Spangler, 2005).
SIES used the groundwater elevation data for wells screened in the shallow aquifer to develop a shallow
potentiometric surface map for March 2016, shown as Figure 3. The groundwater contour map prepared
suggests that shallow groundwater generally flows to the southwest towards a tributary of Pembroke
Creek. However, this flow direction was interpreted with data from a limited area and a relatively flat
water table. Local variations over time may influence the groundwater flow direction.
2.2 GROUNDWATER SAMPLING
Following the completion of DTW measurements, five monitoring wells (MW-1, -2, -3, -4R and -5) were
purged and sampled. Monitoring well purging was performed using a variable speed peristaltic pump and
dedicated polyethylene tubing with a YSI Model 556 multi-parameter water quality meter and flow-through
cell assembled in line with the discharge train. Wells were purged, to the extent possible, at a pumping
rate approximately less than or equal to the recharge rate of the well. Well purging continued until field
parameters (pH, temperature, specific conductivity, dissolved oxygen [DO], and oxidation-reduction
potential [ORP]) stabilized or until the wells were nearly purged dry. Table 2 summarizes the stabilized
field parameters measured during this sampling event and the groundwater sampling logs are provided in
Appendix A.
March 2016 Groundwater Monitoring Report Solutions-IES Project No. 2016.0013.TEDE
Town of Edenton Street Department April 18, 2016
Edenton, Chowan County, NC
3
Groundwater samples were placed directly into laboratory-supplied bottles. The samples were stored on
ice under chain-of-custody control and transported to Prism Laboratories, Inc., in Charlotte, North
Carolina for analysis. Samples were analyzed for volatile organic compounds (VOCs) by EPA Method
6200B, and for volatile petroleum hydrocarbons (VPH) and extractable petroleum hydrocarbons (EPH) by
the Massachusetts Department of Environmental Protection (MADEP) method.
2.3 GROUNDWATER MONITORING RESULTS
Table 3 summarizes the results of the target compounds detected in March 2016 and Table 4
summarizes the historical target compounds results, which includes the applicable 2L Standards for
comparison. The laboratory analytical report for the March 2016 monitoring event is included as
Appendix B. Figure 4 is a contaminant concentration map that shows the concentrations detected in
March 2016.
The laboratory analytical results indicated that the following VOCs were reported at concentrations above
the 2L Standards in groundwater samples collected from monitoring wells MW-2 and MW-4R:
1,2-DCA in MW-2 (1.1 micrograms per liter (µg/L)) and MW-4R (1.8 µg/L); and,
1,2,3-Trichloropropane in MW-4R (1.7 µg/L).
The 2L Standards for 1,2-DCA and 1,2,3-Trichloropropane are 0.4 µg/L and 0.005 µg/L , respectively.
Additional constituents were reported at concentrations above the laboratory analytical method detection
limits but below the NC 2L Standards in monitoring wells MW-1, MW-2, and MW-4R. No constituents
were detected in wells MW-3 and MW-5. The results are presented in Table 3.
The laboratory analytical results indicated that VPH/EPH carbon fractions were not reported at
concentrations above the 2L Standards in any of the groundwater samples collected from the site .
VPH/EPH carbon fractions were reported at concentrations above the laboratory analytical method
detection limits but below the 2L Standards in groundwater samples collected from MW-1, MW-2, and
MW-4R. Each of the detections was flagged with a “J” by the laboratory, indicating that the value was
detected above the method detection limit but below the reporting limit, and is considered estimated. The
results are presented in Table 3.
3.0 CONCLUSIONS
The presumed source area for the contamination is in the former location of the diesel fuel and gasoline
USTs that have been removed from the site. The available historical analytical results indicate that the
March 2016 Groundwater Monitoring Report Solutions-IES Project No. 2016.0013.TEDE
Town of Edenton Street Department April 18, 2016
Edenton, Chowan County, NC
4
petroleum constituents are decreasing with time, and petroleum constituents that have been detected in
the past are all below the 2L Standards. The only remaining constituents detected above the 2L
Standards are 1,2-DCA and 1,2,3-trichloropropane. It is unknown whether these constituents are related
to the petroleum release.
As such, SIES recommends that Edenton submit this report to the NCDEQ Division of Waste
Management, UST Section in the Washington Regional Office with a request for No Further Action for the
petroleum incident.
4.0 REFERENCES
Spangler Environmental Inc., 2005, Semi-Annual Monitoring Report, City of Edenton Street Department,
120 West Hicks Street, Edenton, North Carolina, prepared by Spangler Environmental, Inc.,
3961-B Market Street, Wilmington, North Carolina.
SIES, May 2015, May 2015 Groundwater Monitoring Report, Town of Edenton Street Department, 120
West Hicks Street, Edenton, Chowan County, North Carolina, Groundwater Incident # 12716,
Risk, Rank, and Abatement Score H65R, prepared by Solutions-IES, Inc., 1101 Nowell Road,
Raleigh, North Carolina.
SIES, November 2015 Groundwater Monitoring, Town of Edenton Street Department, 120 West Hicks
Street, Edenton, Chowan County, North Carolina, prepared by Solutions-IES, Inc., 1101 Nowell
Road, Raleigh, North Carolina.
FIGURES
SITE
2000 40000
SCALE IN FEETPROJECTNUMBERDRAFTERCHECKEDBYPROJECTMANAGERDATEFILE
FIGURE:
RALEIGH, NORTH CAROLINA 27607
1101 NOWELL ROAD
TEL.: (919) 873-1060 FAX.: (919) 873-1074
Industrial & Environmental ServicesIndustrial & Environmental Services2016.0013.TEDEKTSCEMWB3/25/2016TownofEdentonStDept.dwg1
EDENTON, NORTH CAROLINA
EDENTON STREET DEPARTMENT
SITE LOCATION MAP
J:\Project Files\Edenton\Town of Edenton Street Dept\Current Drawings\Town of Edenton St Dept.dwg
REFERENCE:
USGS TOPOGRAPHIC MAP
EDENTON, NC 2010
WESTHICKSSTREET
CHAINLINKFENCE
FORMER
DISPENSER
AREA
MW-5
MW-1MW-3
MW-2
MW-4R
30 600
SCALE IN FEETPROJECTNUMBERDRAFTERCHECKEDBYPROJECTMANAGERDATEFILE
FIGURE:
RALEIGH, NORTH CAROLINA 27607
1101 NOWELL ROAD
TEL.: (919) 873-1060 FAX.: (919) 873-1074
Industrial & Environmental ServicesIndustrial & Environmental Services2016.0013.TEDEKTSCEMB3/25/2016TownofEdentonStDept.dwg2
EDENTON, NORTH CAROLINA
EDENTON STREET DEPARTMENT
SITE LAYOUT
J:\Project Files\Edenton\Town of Edenton Street Dept\Current Drawings\Town of Edenton St Dept.dwg
LEGEND
MONITORING WELL
GASOLINE UST
DIESEL UST
NOTE:
BASEMAP BASED ON SPANGLER
ENVIRONMENTAL INC, MAP 2005
WESTHICKSSTREET
CHAINLINKFENCE
FORMER
DISPENSER
AREA
MW-5
MW-1MW-3
MW-2
MW-4R
MW-1
ETHYLBENZENE 2.3
TOLUENE 0.61
TOTAL XYLENES 2.0
C5-C8 ALIPHATICS 26 J
C9-C18 ALIPHATICS 28 J
C9-C22 AROMATICS 1.8 J
MW-2
1,2-DICHLOROETHANE 1.1
MTBE 7.6
C5-C8 ALIPHATICS 6.1 J
MW-4R
1,2-DICHLOROETHANE 1.8
1,2,3-TRICHLOROPROPANE 1.7
MTBE 12
NAPHTHALENE 1.0
C5-C8 ALIPHATICS 30 J
C9-C18 ALIPHATICS 16 J
PROJECTNUMBERDRAFTERCHECKEDBYPROJECTMANAGERDATEFILEFIGURE:
RALEIGH, NORTH CAROLINA 27607
1101 NOWELL ROAD
TEL.: (919) 873-1060 FAX.: (919) 873-1074
Industrial & Environmental ServicesIndustrial & Environmental Services2016.0013.TEDEKTSCEMB3/25/2016TownofEdentonStDept.dwg4
EDENTON, NORTH CAROLINA
EDENTON STREET DEPARTMENT
MARCH 2016
CONTAMINANT CONCENTRATION MAP
J:\Project Files\Edenton\Town of Edenton Street Dept\Current Drawings\Town of Edenton St Dept.dwg
NOTES:
1) BASEMAP BASED ON SPANGLER ENVIRONMENTAL INC, MAP 2005
2) SHADED COMPOUNDS ARE ABOVE THE NC 2L STANDARDS
3) CONCENTRATIONS IN µg/L.
4) J = CONCENTRATION IS ESTIMATED BELOW THE REPORTING LIMIT.
30 600
SCALE IN FEET
LEGEND
MONITORING WELL
GASOLINE UST
DIESEL UST
TABLES
Well Casing Screened Bottom Top of Casing Depth to Groundwater
Depth Interval of Well Elevation Water Elevation
(ft btoc) (ft bgs) (ft bgs) (feet) (ft btoc) (feet)
3/2/2016 6.40 89.92
11/18/2015 7.17 89.15
5/7/2015 6.94 93.24
2/7/2005 7.72 92.46
7/19/2004 7.35 92.83
1/15/2004 6.86 93.32
7/28/2003 7.02 93.16
7/11/2002 8.20 91.98
6/29/1999 8.13 92.05
2/26/1999 8.20 91.98
5/14/1998 7.68 92.50
3/2/2016 6.89 89.92
11/18/2015 7.68 89.13
5/7/2015 7.43 92.73
2/7/2005 8.17 91.99
7/19/2004 7.85 92.31
1/15/2004 NA NA
7/28/2003 7.53 92.63
7/11/2002 8.52 91.64
6/29/1999 8.38 91.78
2/26/1999 8.10 92.06
5/14/1998 7.62 92.54
3/2/2016 6.68 89.81
11/18/2015 7.37 89.12
5/7/2015 7.22 92.78
2/7/2005 7.91 92.09
7/19/2004 7.54 92.46
1/15/2004 NA NA
7/28/2003 7.06 92.94
7/11/2002 8.29 91.71
6/29/1999 8.06 91.94
2/26/1999 8.10 91.90
5/14/1998 7.62 92.38
5/7/2015 NA NA
2/7/2005 8.01 92.30
7/19/2004 7.58 92.73
1/15/2004 6.58 93.73
7/28/2003 7.18 93.13
7/11/2002 8.35 91.96
6/29/1999 8.11 92.20
2/26/1999 7.90 92.41
5/14/1998 7.69 92.62
3/2/2016 7.19 90.27
11/18/2015 8.11 89.35
MW-3 12.96 Unknown 12.96
MW-4R 15 5 - 15 15
Unknown
9.41
96.32
MW-2 8.33 Unknown 8.33
96.81
EDENTON, CHOWAN COUNTY, NORTH CAROLINA
INCIDENT # 12716
SOLUTIONS-IES PROJECT NUMBER 2016.0013.TEDE
UnknownMW-4
100.16
MW-1
TABLE 1
SUMMARY OF GROUNDWATER ELEVATION DATA
TOWN OF EDENTON STREET DEPARTMENT
120 WEST HICKS STREET
Well ID
100.18
Date
Measured
9.41 Unknown
100.00
100.31
96.49
97.46
Unknown
1 of 2
Well Casing Screened Bottom Top of Casing Depth to Groundwater
Depth Interval of Well Elevation Water Elevation
(ft btoc) (ft bgs) (ft bgs) (feet) (ft btoc) (feet)
EDENTON, CHOWAN COUNTY, NORTH CAROLINA
INCIDENT # 12716
SOLUTIONS-IES PROJECT NUMBER 2016.0013.TEDE
TABLE 1
SUMMARY OF GROUNDWATER ELEVATION DATA
TOWN OF EDENTON STREET DEPARTMENT
120 WEST HICKS STREET
Well ID Date
Measured
3/2/2016 6.19 90.20
11/18/2015 6.86 89.53
5/7/2015 6.65 93.55
2/7/2005 7.29 92.91
7/19/2004 7.22 92.98
1/15/2004 7.12 93.08
7/28/2003 6.71 93.49
7/11/2002 8.11 92.09
6/29/1999 7.90 92.30
2/26/1999 7.50 92.70
5/14/1998 7.38 92.82
Notes:
2. ft bgs: feet below ground surface
3. ft btoc: feet below top of casing
4. NA - Information not available. MW-4 could not be located during the 5/7/2015 sampling event.
5. Well elevations re-surveyed with rod and level by Solutions-IES on November 9, 2015.
6. Well MW-4R installed November 9, 2015.
1. Data before 5/1/2015 are from the Semi-Annual Monitoring Report dated April 7, 2005 prepared by Spangler Environmental, Inc.
MW-5 24.87 Unknown 24.87
96.39
100.20
2 of 2
Well pH
Specific
Conductivity ORP Temperature DO
ID (SU) (µS/cm) (mV) (ºC) (mg/L)
MW-1 6.08 225 -66.8 16.33 0.90
MW-2 4.98 236 96.8 16.43 0.90
MW-3 5.34 167 69.3 16.06 5.15
MW-4R 5.25 414 107.8 15.99 0.33
MW-5 6.75 279 -99.4 19.24 0.23
Notes:
1. SU = Standard units
2. µS/cm = Microsiemens per centimeter
3. ORP = Oxidation Reduction Potential
4. mV = Millivolts
5. ºC = degrees centigrade
6. DO = Dissolved oxygen
7. mg/L = milligrams per liter
MONITORING WELLS
TABLE 2
SUMMARY OF GROUNDWATER FIELD PARAMETERS - MARCH 2016
EDENTON, CHOWAN COUNTY, NORTH CAROLINA
INCIDENT # 12716
TOWN OF EDENTON STREET DEPARTMENT
120 WEST HICKS STREET
SOLUTIONS-IES PROJECT NUMBER 2016.0013.TEDE
VOCs by EPA Method 6200B
15A NCAC 2L
Groundwater Standards MW-1 MW-2 MW-3 MW-4R MW-5
1,2-Dichloroethane 0.4 <0.5 1.1 <0.5 1.8 <0.5
1,2,3-Trichloropropane 0.005 <0.5 <0.5 <0.5 1.7 <0.5
1,2,4-Trimethylbenzene 400 <0.5 <0.5 <0.5 <0.5 <0.5
Benzene 1 <0.5 <0.5 <0.5 <0.5 <0.5
Ethylbenzene 600 2.3 <0.5 <0.5 <0.5 <0.5
MTBE 20 <2.0 7.6 <1.0 12 <1.0
IPE 70 <0.5 <0.5 <0.5 <0.5 <0.5
Toluene 600 0.61 <0.5 <0.5 <0.5 <0.5
Total Xylenes 500 2.0 <1.5 <1.5 <1.5 <1.5
Isopropylbenzene 70 <0.5 <0.5 <0.5 <0.5 <0.5
n-Propylbenzene 70 <0.5 <0.5 <0.5 <0.5 <0.5
Naphthalene 6 <1.0 <1.0 <1.0 1.0 <1.0
Tetrachloroethylene 0.7 <0.5 <0.5 <0.5 <0.5 <0.5
Trichloroethylene 3 <0.5 <0.5 <0.5 <0.5 <0.5
VPH/EPH by MADEP Method
C5-C8 Aliphatics 400 26 J 6.1 J <50 30 J <50
C9-C18 Aliphatics 700 28 J <400 <400 16 J <400
C-19-C36 Aliphatics 10,000 <500 <500 <500 <500 <500
C9-C22 Aromatics 200 1.8 J <150 <150 <150 <150
Notes:
1. Bolded cells indicate detected constituents; shaded cells exceed the NCAC 2L Groundwater Standards.
2. All concentrations expressed as micrograms per liter (ug/L)
3. NCAC 2L Standards: 15A NCAC 2L Groundwater Standards
4. VOCs: Volatile Organic Compounds
5. VPH/EPH: Volatile Petroleum Hydrocarbons/ Extractible Petroleum Hydrocarbons
6. MADEP: Massachusetts Department of Environmental Protection
7. J: Estimated concentration
SOLUTIONS-IES PROJECT NUMBER 2016.0013.TEDE
TABLE 3
SUMMARY OF DETECTED COMPOUNDS IN GROUNDWATER - MARCH 2016
TOWN OF EDENTON STREET DEPARTMENT
120 WEST HICKS STREET
EDENTON, CHOWAN COUNTY, NORTH CAROLINA
INCIDENT # 12716
Well ID Date
Collected
Benzene
(ug/L)
Toluene
(ug/L)
Ethylbenzene
(ug/L)
Total
Xylenes
(ug/L)
MTBE
(ug/L)
IPE
(ug/L)
Naphthalene
(ug/L)
TCE
(ug/L)
PCE
(ug/L)
1,2,3-
Trichloropropane
1,2-DCA
(ug/L)
1 600 600 500 20 70 6 3 0.7 0.005 0.4
3/2/2016 <0.5 0.61 2.3 2.0 <2.0 <0.5 <1.0 <0.5 <0.5 <0.5 <0.5
11/18/2015 <0.5 <0.5 <0.5 0.67J <1.0 <0.5 0.82J <0.5 1.2 <0.5 <0.066
5/7/2015 <0.5 <0.5 0.51 <1.5 <1.0 <0.5 14 <0.5 0.74 <0.5 <0.5
2/7/2005 95.8 139 1400 3111 ND ND NA NA NA NA NA
7/19/2004 39.1 140 612 1274 ND ND NA NA NA NA NA
1/15/2004 ND ND 1300 3300 ND ND NA NA NA NA NA
7/28/2003 ND 130 1200 4620 ND ND NA NA NA NA NA
7/11/2002 ND 130 1200 2860 ND ND NA NA NA NA NA
6/29/1999 140 840 1200 4600 NA NA NA NA NA NA NA
2/26/1999 160 870 910 3420 NA NA NA NA NA NA NA
5/14/1998 <200 480 1100 4500 NA NA NA NA NA NA NA
3/2/2016 <0.5 <0.5 <0.5 <1.5 7.6 <0.5 <1.0 <0.5 <0.5 <0.5 1.1
11/18/2015 <0.5 <0.5 <0.5 <1.5 16 <0.5 <1.0 0.59 1.5 <0.5 2.2
5/7/2015 <0.5 <0.5 <0.5 <1.5 14 <0.5 <1.0 0.65 0.57 <0.5 2.8
2/7/2005 1.22 ND ND ND ND ND NA NA NA NA NA
7/19/2004 ND ND ND ND ND ND NA NA NA NA NA
1/15/2004 ND ND ND ND ND ND NA NA NA NA NA
7/28/2003 ND ND ND ND ND ND NA NA NA NA NA
7/11/2002 15 ND ND ND 3 ND NA NA NA NA NA
6/29/1999 ND ND ND ND NA NA NA NA NA NA NA
2/26/1999 ND ND ND ND NA NA NA NA NA NA NA
5/14/1998 ND ND ND ND NA NA NA NA NA NA NA
3/2/2016 <0.5 <0.5 <0.5 <1.5 <1.0 <0.5 <1.0 <0.5 <0.5 <0.5 <0.5
11/18/2015 <0.5 <0.5 <0.5 <1.5 16 <0.5 <1.0 <0.5 1.4 <0.5 <0.066
5/7/2015 <0.5 <0.5 <0.5 <1.5 <0.5 <0.5 <1.0 <0.5 <0.5 <0.5 <0.5
2/7/2005 ND ND ND ND ND ND NA NA NA NA NA
7/19/2004 ND ND ND ND ND ND NA NA NA NA NA
1/15/2004 ND ND ND ND ND ND NA NA NA NA NA
7/28/2003 ND ND ND ND ND ND NA NA NA NA NA
7/11/2002 ND ND ND ND ND ND NA NA NA NA NA
6/29/1999 ND ND ND ND NA NA NA NA NA NA NA
2/26/1999 ND ND ND ND NA NA NA NA NA NA NA
5/14/1998 ND ND ND ND NA NA NA NA NA NA NA
5/7/2015 NA NA NA NA NA NA NA NA NA NA NA
2/7/2005 6.51 ND ND ND 33.8 ND NA NA NA NA NA
7/19/2004 27 ND ND ND 24.9 ND NA NA NA NA NA
1/15/2004 17 ND ND ND 29 ND NA NA NA NA NA
7/28/2003 3.2 ND ND ND 38 1.2 NA NA NA NA NA
7/11/2002 1 ND ND ND 32 ND NA NA NA NA NA
6/29/1999 ND ND ND ND 38 NA NA NA NA NA NA
2/26/1999 ND ND ND ND 26 NA NA NA NA NA NA
5/14/1998 ND ND ND ND 22 NA NA NA NA NA NA
EDENTON, CHOWAN COUNTY, NORTH CAROLINA
SOLUTIONS-IES PROJECT NUMBER 2016.0013.TEDE
MW-2
MONITORING WELLS
2L Standard
MW-1
MW-4
120 WEST HICKS STREET
TABLE 4
SUMMARY OF HISTORICAL GROUNDWATER ANALYTICAL RESULTS
Analytical Method VOCs by Method 6200B
TOWN OF EDENTON STREET DEPARTMENT
MW-3
INCIDENT # 12716
1 of 2
Well ID Date
Collected
Benzene
(ug/L)
Toluene
(ug/L)
Ethylbenzene
(ug/L)
Total
Xylenes
(ug/L)
MTBE
(ug/L)
IPE
(ug/L)
Naphthalene
(ug/L)
TCE
(ug/L)
PCE
(ug/L)
1,2,3-
Trichloropropane
1,2-DCA
(ug/L)
1 600 600 500 20 70 6 3 0.7 0.005 0.4
EDENTON, CHOWAN COUNTY, NORTH CAROLINA
SOLUTIONS-IES PROJECT NUMBER 2016.0013.TEDE
2L Standard
120 WEST HICKS STREET
TABLE 4
SUMMARY OF HISTORICAL GROUNDWATER ANALYTICAL RESULTS
Analytical Method VOCs by Method 6200B
TOWN OF EDENTON STREET DEPARTMENT
INCIDENT # 12716
3/2/2016 <0.5 <0.5 <0.5 <1.5 12 <0.5 1 <0.5 <0.5 1.7 1.8
11/18/2015 <0.5 <0.5 <0.5 <1.5 17 <0.5 <1.0 <0.5 <0.5 <0.5 2.0
3/2/2016 <0.5 <0.5 <0.5 <1.5 <1.0 <0.5 <1.0 <0.5 <0.5 <0.5 <0.5
11/18/2015 <0.5 <0.5 <0.5 <1.5 16 <0.5 <1.0 <0.5 <0.5 <0.5 <0.066
5/7/2015 <0.5 <0.5 <0.5 <1.5 <0.5 <0.5 <1.0 <0.5 <0.5 <0.5 <0.5
2/7/2005 ND ND ND ND ND ND NA NA NA NA NA
7/19/2004 ND ND ND ND ND ND NA NA NA NA NA
1/15/2004 ND ND ND ND ND ND NA NA NA NA NA
7/28/2003 ND ND ND ND ND ND NA NA NA NA NA
7/11/2002 ND ND ND ND ND ND NA NA NA NA NA
6/29/1999 ND ND ND ND NA NA NA NA NA NA NA
2/26/1999 ND ND ND ND NA NA NA NA NA NA NA
5/14/1998 ND ND ND ND NA NA NA NA NA NA NA
Notes:
1. Bolded cells indicate detected constituents; shaded cells exceed the NCAC 2L Groundwater Standards.
2. Compounds not listed were below the quantitation limit.
4. J - Estimated concentration between the method detection limit and the reporting limit.
5. ND - Not Detected
6. NA - Not Analyzed
7. ug/L = micrograms per liter
9. Prior to March 2015, the analytical method used was EPA Method 602.
3. Data before 5/1/2015 are from the Semi-Annual Monitoring Report dated April 7, 2005 prepared by Spangler Environmental, Inc.
MW-4R
8. 2L Standard: 15A NCAC 2L Groundwater Standard
MW-5
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APPENDIX A
GROUNDWATER SAMPLING LOGS
APPENDIX B
LABORATORY ANALYTICAL REPORT AND CHAIN OF CUSTODY RECORD
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