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Home My WebLink AboutRA-2070_12610_CA_MRP_20120703_CES GW_Monitoring_Reporti TABLE OF CONTENTS EXECUTIVE SUMMARY 1.0 SITE INFORMATION .................................................................................................................. 1 1.1 Site Identification ................................................................................................................ 1 1.2 Contact Information ............................................................................................................ 1 1.3 Release Information ............................................................................................................ 1 1.4 Certification ........................................................................................................................ 1 2.0 SITE HISTORY AND CHARACTERIZATION ....................................................................... 2 2.1 UST Information ................................................................................................................. 2 2.2 Description of Release ........................................................................................................ 2 2.3 Site Characteristics ............................................................................................................. 3 2.4 Current Receptor Information ............................................................................................. 4 3.0 CURRENT SITE ASSESSMENT INFORMATION .................................................................. 4 3.1 Groundwater Sampling Results .......................................................................................... 4 3.2 Hydrogeology ..................................................................................................................... 5 4.0 CONCLUSIONS AND RECOMMENDATIONS ....................................................................... 5 4.1 Conclusions ......................................................................................................................... 5 4.2 Recommendations ............................................................................................................... 6 TABLES Table 1 Water Supply Well Information Table 2 Property Owners/Occupants Table 3 Monitoring Well Construction Data Table 4 Summary of Groundwater Sample Analytical Results FIGURES Figure 1 Site Location Map Figure 2 Site Map Figure 3 Water Supply Well Locations Map Figure 4 Contiguous Properties Map Figure 5 Dissolved-Phase COC Map Figure 6 Benzene in Groundwater Isoconcentration Map Figure 7 Naphthalene in Groundwater Isoconcentration Map Figure 8 Potentiometric Map APPENDICES Appendix A Laboratory Analytical Report and Chain of Custody ii EXECUTIVE SUMMARY CES personnel were onsite on May 23, 2012, to conduct a groundwater and water supply well monitoring event. Groundwater samples were collected from monitoring wells MW-1 through MW-7 and MW-1D and a water sample from water supply well WSW-3. Based upon the results of these activities, CES determined the following:  Groundwater sampling results indicated targeted compounds exceeding 2L Standards in MW-1.  Impact to groundwater has been delineated.  The decreasing trend of targeted compounds contaminant concentrations in MW-1 indicate that remediation through natural attenuation is occurring at the site.  Two private potable water supply wells (WSW-1 and WSW-3) have been determined to currently exist within 1,000 feet of the site. Water supply well WSW-2 was reportedly abandoned in March of 2012. CES recommends the following:  Public water is not available in the vicinity of the site.  Classify the site as high risk due to potable wells located in the vicinity of the site and presence of impacted soil and groundwater at the site.  Continue groundwater and water supply well monitoring at the site.  Include MADEP VPH in analysis of monitoring wells as 2L Violations of the compounds detected under this analytical method have occurred historically at the site. 1 1.0 SITE INFORMATION 1.1 Site Identification Date of Report: July 3, 2012 Facility I.D.: Unknown UST Incident Number: 12610 Site Name: Four Corners Store Site Street Address: 6154 West Mount Drive City/Town: Rocky Mount Zip Code: 27803 County: Nash Description of Geographical Data Point: Center of Site Property Location Method: Topographic Map Latitude: 35º 54’ 18.86”N Longitude: 77º 54’ 13.15”W 1.2 Contact Information UST Owner: Unknown Address: Tel: UST Operator: Unknown Address: Tel: Property Owner: Loretta Langley Address: 529 1017 West Haven Blvd., Rocky Mount, NC 27803 Tel: Property Occupant: Claude’s Construction Address: 5332 NC HWY 158 Tel: 252-443-6788 Consultant Contractor: Crawford Environmental Services Address: 15 Church Avenue SW, Roanoke, VA 24011 Tel: 504-343-6256 Analytical Laboratory: Pace Analytical Address: 9800 Kincey Avenue, suite 100, Huntersville, NC 28078 Tel: 704-875-9092 1.3 Release Information Date Discovered: March 1994 Estimated Quantity of Release: Unknown Cause of Release: overfills of USTs, leaks from USTS and associated dispenser island Source of Release: 2- 6000 gallon USTs and associated dispenser system. Criteria Used to Classify Risk: High Risk due to WSWs located within 1,000 feet of the site. 1.4 Certification I, David P. Kwiatkowski, L.G. a Licensed Geologist for Crawford Environmental Services, do certify that the information contained in this report is correct and accurate to the best of my knowledge. 2 2.0 SITE HISTORY AND CHARACTERIZATION 2.1 UST Information Formerly 2-6000 gallon USTs (contents unknown) existed at the site for petroleum retail until 1994 when they were closed by removal. 2.2 Description of Release The USTs were closed by removal by removal in March 1994. During closure activities, a petroleum sheen was observed on groundwater encountered in the UST basin. Laboratory analyses performed on the soil samples collected from the UST basin, product lines and dispenser yielded total petroleum hydrocarbon concentrations in excess of the North Carolina State Action Level of 10.0 parts per million. A release was reported to the NCDENR at this time, but no soil samples were collected. 2005 to 2008: Due to the presence of residual-phase impacts observed during UST closure activities, NCDENR requested further investigation to evaluate the extent of the confirmed impacts and the potential risk to human health and the environment. Six two-inch monitoring wells (MW-1, MW-1D, MW-2, MW-3, MW-4, and MW-5 were installed at the site. According to the historical information obtained by CES, monitoring well MW-3 was installed proximal to the former UST basin. Monitoring wells MW-1 and MW-1D were installed west of the existing canopy. Monitoring wells MW-2, MW-4, and MW-5 were installed at various locations across the site to determine vertical and horizontal plume extents and to establish the hydraulic gradient. Subsequent chemical analyses revealed dissolved-phase petroleum compound concentrations in excess of the North Carolina 15A NCAC 2L .0202 (2L) groundwater standards in samples collected from monitoring wells MW-1, MW-1D, MW-3, MW4, and MW-5. The on-site supply well (WSW-1) and two adjacent supply wells (WSW-2 and WSW-3) also were sampled. Chloromethane was measured in excess of the 2L standard in samples collected from supply wells WSW-2 and WSW-3. No additional analytes were measured at, or in excess of, the respective laboratory method detection limits in samples collected from supply well WSW-1. July 2009 to February 2010: In accordance with regulatory directives, Terraine, Inc. (Terraine) performed multiple monitoring events in 2009 and 2010. Laboratory analytical results indicated elevated concentrations of dissolved- phase petroleum compounds in excess of the 2L groundwater standards in samples collected from monitoring wells MW-1, MW-3, and MW-4. A WellBoom™ manufactured by Universal Remediation, Inc. was installed in monitoring well MW-1 subsequent to sample collection. Samples collected from 3 water supply wells WSW-2 and WSW-3 did not reveal measurable concentrations above the respective laboratory method detection limits. Water supply well WSW-1 was not sampled during this timeframe. September 2010 to January 2012: In accordance with further regulatory directives, Terraine supervised the installation of two additional two-inch monitoring wells MW-6 and MW-7 in September 2010 to in an effort to define the northeast and southern edge of the dissolved-phase contaminant plume. Subsequent groundwater analyses revealed dissolved-phase petroleum impacts in excess of the 2L groundwater standards in samples collected from monitoring wells MW-1, MW-3, MW-4, MW-6, and MW-7. Lead was measured above the laboratory method detection limit in the samples collected from monitoring wells MW-1D and MW-2. Lead was detected above the 2L standard in the sample collected from supply well WSW-3. No additional analytes of concern were measured at, or in excess of, the respective laboratory method detection limits in the samples collected from supply wells WSW-1 and WSW-2. Terraine completed an additional monitoring event in May 2011. Analytical results revealed elevated dissolved-phase concentrations in excess of the 2L groundwater standards in samples collected from monitoring wells MW-1, MW-1D, MW-2, MW-3, MW-4, MW-6, and MW-7. Petroleum impacts were not identified in samples collected from supply wells WSW-1 and WSW-2. Water supply well WSW-3 was unable to be sampled during this monitoring event. CES mobilized to the site on December 13, 2011 to perform a receptor survey update and groundwater monitoring event to assess current dissolved-phase contaminant levels and to confirm the presence or absence of free-phase petroleum. CES was unable to locate the majority of the monitoring wells due to the large amount of gravel now covering the site. On January 16, 2012, CES returned to the site with a metal detector and was able to locate all site monitoring wells. Groundwater samples were collected from monitoring wells MW-1, MW-1D, MW-2, MW-3, MW-4, MW-5, MW-6, and MW-7. CES also collected groundwater samples from supply well WSW-3. Analytical results indicated targeted compounds above 2L Standards in MW-1. CES identified three private potable water supply wells located onsite (WSW-1) and within 1,000 feet of the site (WSW-2 and WSW-3). 2.3 Site Characteristics The subject property (site) is located at 6154 West Mount Drive in a mixed-use area within the jurisdictional limits of Rocky Mount, North Carolina (Figure 1). Currently two one-story buildings are present on site. Claude’s Construction, Inc. currently occupies one of the dwellings and the second 4 building is vacant. The site formerly maintained two 6,000-gallon underground storage tanks (USTs), both of which were removed from the ground in March 1994. Information referring to the contents of the USTs was not readily attainable in the UST closure report. Ground cover at the site further consists of asphalt, gravel, and concrete parking/access areas and a canopy cover. A chain link fence surrounds the rear of the property where a propane aboveground storage tank (AST) is located. According to the U.S. Geological Survey 7 ½ Minute Series Topographic Map of the Rocky Mount Quadrangle, North Carolina, the site elevation is approximately 176.0 feet above mean sea level. The property is bordered to the west by South Old Carriage Road and to the southeast by West Mount Drive. Residential and agricultural parcels are located in all directions from the site. The site obtains potable water from an on-site water supply well WSW-1. Water supply well WSW-1 also supplies potable water to a residence located at 6164 West Mount Drive. A site plan depicting pertinent features of the subject property is provided as Figure 2. 2.4 Current Receptor Information The subject site is situated in the Yorktown Formation and Duplin Formation, Undivided and located in the Pre-Mesozoic Basement of the Coastal Plain Physiographic Province. The nearest identified surface water body, an unnamed pond, is located approximately 750 feet east of the subject site. There are additional small ponds located in all directions from the site within 1,000 feet. Municipal water is not available to the area in the vicinity of the site. Three water supply wells (WSW-1 through WSW-3) have been identified within 1,000 feet of the site. Based upon interview of the property owner for WSW-2, WSW-2 was abandoned in March of 2012. A summary of the water supply well information is included in Table 1. The locations of the water supply wells are shown in Figure 3. The site is located in the Coastal Plain Physiographic Region. There are no Wellhead Protection Areas located in the vicinity of the site. The site is currently utilized as Claudes Construction Co. and is surrounded by residential property to the south and agricultural land to the north, east and west. A summary of the adjacent property owner information is included in Table 2. Figure 4 presents a map showing the adjacent properties. 3.0 CURRENT SITE ASSESSMENT INFORMATION 3.1 Groundwater Assessment Results CES collected groundwater samples from monitoring wells MW-1 through MW-7 and MW-1D on May 23, 2012. Prior to sampling, a depth to water measurements were collected from the monitoring wells using an electronic water level meter. The wells were then purged by removing at least three well volumes of groundwater using a new dedicated disposable bailers and new nylon cord. Upon purging, groundwater samples were collected from the wells using the dedicated bailers. In addition, CES 5 personnel collected water samples from water supply well WSW-3. The water supply well was purged by opening a tap and allowing water to flow for at least 10 minutes prior to sampling. The samples were transferred to laboratory prepared containers, immediately placed on ice in a cooler and transported under chain-of-custody to Pace Analytical, a NC Certified laboratory. The samples were analyzed for volatile organic compounds by EPA Method 6200B + IPE, MTBE and EDB by EPA Method 504.1. The depth to water measurements are included in Table 3. The well locations are presented in Figure 2. A copy of the chain of custody is included in Appendix A. Based upon the analytical reports targeted compounds were detected at concentrations exceeding 2L Standards in the samples collected from MW-1. Table 4 presents a summary of the analytical results. Figure 5 presents the sample location and results. Figure 6 and 7 present benzene and naphthalene in groundwater isoconcentration maps, respectively. A copy of the analytical report is included in Appendix A. 3.2 Hydrogeology On May 23, 2012 CES personnel collected depth to water measurements from each of the monitoring wells (MW-1, through MW-7 and MW-1D) using a decontaminated electronic water level meter. The depth to water measurements ranged from approximately 0.5 feet to 5 feet below land surface across the site. Based upon reduction of the depth to water measurements and relative well head survey data, groundwater flow direction was determined to be to the northeast with a hydraulic gradient of approximately 0.015. A summary of the depth to water measurements and relative groundwater elevation data is included in Table 3. Figure 8 presents a potentiometric map for the site. 4.0 CONCLUSIONS AND RECOMMENDATIONS 4.1 Conclusions  Groundwater sampling results indicated targeted compounds exceeding 2L Standards in MW-1.  Impact to groundwater has been delineated.  The decreasing trend of targeted compounds contaminant concentrations in MW-1 indicate that remediation through natural attenuation is occurring at the site.  Two private potable water supply wells (WSW-1 and WSW-3) have been determined to currently exist within 1,000 feet of the site. Water supply well WSW-2 was reportedly abandoned in March of 2012.  Public water is not available in the vicinity of the site. 6 4.2 Recommendations  Classify the site as high risk due to potable wells located in the vicinity of the site and presence of impacted soil and groundwater at the site.  Continue groundwater and water supply well monitoring at the site.  Include MADEP VPH in analysis of monitoring wells as 2L Violations of the compounds detected under this analytical method have occurred historically at the site. TABLES TABLE 1WATER SUPPLY WELL INFORMATIONFOUR CORNERS STORENASHVILLE, NCINCIDENT No. 12610WELL IDWELL OWNER/USERADDRESS*WELL USEDISTANCE FROM SOURCE AREA (FT)UP OR DOWN GRADIENTUSAGEWSW‐1 Troy L. Langley6154 & 6164 West Mount Drive Potable 100 Down Gradient ActiveWSW‐2 Troy L. Langley 6232 West Mount Drive Potable 450 Down Gradient InactiveWSW‐3 Floyd Thompson 6191 West Mount Drive Potable 400 Up Gradient ActiveAll Properties are located in Rocky Mount, NC 27803. TABLE 2 PROPERTY OWNERS/OCCUPANTS FOUR CORNERS STORE NASHVILLE, NC INCIDENT No. 12610 TAX PARCEL NUMBER/ MAP ID OWNER/OCCUPANT NAME (Last, First MI)MAILING ADDRESS PROPERTY ADDRESS Site Langley, Loretta C.1017 West Haven Blvd. Rocky Mount, NC 27803 6154 West Mount Drive, Rocky Mount, NC 27803 1 Cobb, Henry N. & Shirley W.4486 S. Old Carriage Rd. Rocky Mount, NC 27803 4625 S. Old Carriage Rd. Rocky Mount, NC 27803 2 Whitby, Beatrice P.5491 West Mount Drive Nashville, NC 27856 Parcel ID #021078 (S. Old Carriage Rd.) 3 Moore, John S.6917 Raspberry Plain Pl. Springfield, VA 22153 4934 S. Old Carriage Rd. Rocky Mount, NC 27803 4 Mosley, Wilbur T. & Gloria P.8159 Bend of the River Rd. Rocky Mount, NC 27803 Parcel ID #020308 (S. Old Carriage Rd.) 5 Eason, Will W.713 Nichole Lane Rocky Mount, NC 27803 5076 S. Old Carriage Rd. Rocky Mount, NC 27803 6 Thompson, Floyd C. & Audrey J.6191 West Mount Dr. Rocky Mount, NC 27803 6135 West Mount Drive Rocky Mount, NC 27803 7 Thompson, Floyd C. & Audrey J.6191 West Mount Dr. Rocky Mount, NC 27803 6191 West Mount Drive Rocky Mount, NC 27803 8 Daughtridge, Marie J.6243 West Mount Drive Rocky Mount, NC 27803 Parcel ID #020516 (S. Old Carriage Rd.) 9 Daughtridge, Marie J.6243 West Mount Drive Rocky Mount, NC 27803 6243 West Mount Drive Rocky Mount, NC 27803 10 Moore, John S.6917 Raspberry Plain Pl. Springfield, VA 22153 6517 West Mount Drive Rocky Mount, NC 27803 11 Langley, Roscoe H. & Stella K.1617 Hammond St. Rocky Mount, NC 27803 6570 West Mount Drive Rocky Mount, NC 27803 TABLE 3MONITORING WELL CONSTRUCTION INFORMATIONFOUR CORNERS STORENASHVILLE, NCINCIDENT No. 12610Well IDDate InstalledWell Casing depth (ft.)Screened Interval (ft BLS)Depth of Well (BLS)Top of Casing Elevation* (ft.)Date Water Level MeasuredDepth to WaterFree Product Thickness(ft.)**Groundwater Elevation*Comments100.00 5/13/2007 1.75 NA 98.25100.00 2/23/2010 0.90 NA 99.10100.00 10/6/2010 1.99 NA 98.01100.00 5/9/2011 1.84 NA 98.16100.00 5/23/2012 1.17 NA 98.83100.02 5/13/2007 2.36 NA 97.66100.022/23/2010 0.15 NA 99.87100.0210/6/2010 6.72 NA 93.30100.025/9/2011 9.90 NA 90.12100.025/23/2012 4.19 NA 95.8399.24 5/13/2007 1.88 NA 97.3699.2410/6/2010 2.07 NA 97.1799.245/9/2011 2.39 NA 96.8599.245/23/2012 1.17 NA 98.07100.04 5/13/2007 2.22 NA 97.82100.042/23/2010 2.53 NA 97.51100.0410/6/2010 1.84 NA 98.20100.045/9/2011 1.31 NA 98.73100.045/23/2012 0.54 NA 99.50100.96 5/13/2007 2.47 NA 98.49100.96 10/6/2010 2.75 NA 98.21100.96 5/9/2011 2.70 NA 98.26100.965/23/2012 1.98 NA 98.9899.88 5/13/2007 2.97 NA 96.9199.88 10/6/2010 4.73 NA 95.1599.88 5/9/2011 3.31 NA 96.5799.885/23/2012 3.29 NA 96.59100.9910/6/2010 2.25 NA 98.74100.995/9/2011 2.83 NA 98.16100.995/23/2012 1.96 NA 99.0399.21 10/6/2010 6.34 NA 92.8799.21 5/9/2011 4.63 NA 94.5899.21 5/23/2012 3.82 NA 95.39In a GWM report dated October 5th, 2009 by Terraine, Inc. the installation dates for MW‐1, MW‐1D and MW‐2 were incorrectly listed as 2/1/06.* ‐ Reference Point for Elevation Measurements is the Top of Casing of MW‐1. Assumed Elevation of 100.00 ft.** ‐ Groundwater elevation calculated by [Top of Casing Elevation ‐ Depth to water] + [Free Product Thickness x 0.8581]4 ‐ 141444 ‐ 14 14422 ‐ 12 1222 ‐ 12 1222 ‐ 12 1222 ‐ 12 12133 ‐ 13340 40 ‐ 45 45MW‐3 5/23/2006MW‐7 9/15/2010MW‐1 10/25/2005MW‐1D 10/25/2005MW‐2 10/25/2005MW‐5 5/23/2006MW‐4 5/23/2006MW‐6 9/15/2010 TABLE 4SUMMARY OF GROUNDWATER SAMPLING ANALYTICAL RESULTSFOUR CORNERS STORENASHVILLE, NCINCIDENT No. 126105/13/20081030 3620 2810 9750ND ND ND828ND ND ND163ND389ND2930 735ND NA NA NA NA NA7/1/20091310 1930 2490 7332ND ND ND766 93.8ND ND ND ND298ND2400 607ND NA1510 3860181 ND12/10/2009 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA ND ND ND ND2/23/20101320 1570 2380 582412.0 ND ND706ND 12.6 ND130ND285ND1900 524ND ND15400 34900 59505.010/6/2010892 1700 2540 8020ND ND ND1200ND ND ND133 55.0 40557.23530 982ND199 13100 82545 11630 15.75/9/2011990 2480 2390 8070ND ND ND1020 89.5ND ND94.7ND323ND2500 685ND785 18100 83700 3168 16.61/16/2012801 1120 1920 5588ND ND ND743ND ND ND106ND266ND1910 576ND NA NA NA NA NA5/23/201212782.9 331978.8ND ND ND208ND ND ND 23.959.060.5 ND568176 ND ND NA NA NA NA5/13/2008 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA7/1/2009 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA ND ND ND ND2/23/2010 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA ND ND ND ND10/6/2010 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 7.55/9/201152320.5 184 336.7 10.4 4.3 ND82.2ND ND ND 18.0 ND 29.3 ND 98.3 1.6 10.6 22.22680 5720 1034 29.31/16/2012 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA5/23/20123.1ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA5/13/2008 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA7/1/200910/6/2010 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 11.85/9/2011 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND19.71/16/2012 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA5/23/2012 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA5/13/2008 ND ND ND ND 3.2 ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA7/1/2009 ND ND ND ND 5.0 3.2 ND ND ND ND ND ND ND ND ND ND ND ND NA ND ND ND37.42/23/2010 ND ND ND ND 1.8 ND ND ND ND ND ND ND ND ND ND ND ND ND NA ND ND ND ND10/6/2010 ND ND ND ND 0.57 ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA32.35/9/2011ND ND ND ND 0.59 ND ND ND ND ND ND ND ND ND ND ND ND ND NA ND ND ND75.11/16/2012 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA5/23/2012 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA1 600 600 500 20 70 0.02 6 70 70 NL 70 5 70 NL 400 400 0.4 30 400 700 200 155000 260000 84500 85500 20000 70000 50 6000 6900 8500 NL 25000 5000 30,000 NL 28,500 25,000 400 12,500 NL NL NL 15,000NA ‐ Not AnalyzedND ‐ Not Detected J ‐ Estimated ConcentrationBold ‐ Concentration exceeds 2L Standard. Shaded ‐ Concentration exceeds GCL.ANALYTICAL METHOD6200BWELL ID Date CollectedCONTAMINANTS OF CONCERN/CONCENTRATION (µg/L)1,2,4‐Trimethylbenzene1,3,5‐TrimethylbenzeneLeadBenzeneEthylbenzeneEDB (504.1)TolueneXylenes (Total)C5‐C8 AliphaticsC9‐C18 AliphaticsC9‐C22 Aromatics1,2‐Dichloroethane2‐Methylnapthalene1,2,3‐TrichlorobenzeneMTBE2L Standard (µg/L)GCL (µg/L)n‐PropylbenzeneNaphthaleneIPEn‐Butylbenzenesec‐butylbenzeneIsopropylbenzeneMW‐1DMethylene ChlorideMW‐2MW‐3MW‐1BromomethaneNOT SAMPLED TABLE 4 (Cont)SUMMARY OF GROUNDWATER SAMPLING ANALYTICAL RESULTSFOUR CORNERS STORENASHVILLE, NCINCIDENT No. 126105/13/2008 ND ND NDNDND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA7/1/2009 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA ND ND ND64.510/6/2010 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND41.05/9/2011 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND1091/16/2012 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA5/23/2012 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA5/13/2008 ND ND NDND11.5 ND ND ND ND ND ND ND ND ND ND ND ND0.98NA NA NA NA NA7/1/200910/6/2010 ND ND ND ND 9.8 ND ND ND ND ND ND ND ND ND ND ND ND0.64ND NA NA NA NA5/9/2011 ND ND ND ND 8.0 ND ND ND ND ND ND ND ND ND ND ND ND ND NA ND ND ND NA1/16/2012 ND ND ND ND 5.5 ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA5/23/2012 ND ND ND ND 6.9 ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA10/6/2010 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND84.55/9/2011 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND28.51/16/2012 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA5/23/2012 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA10/6/2010 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND78.15/9/2011 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND28.61/16/2012 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA5/23/2012 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA1 600 600 500 20 70 0.02 6 70 70 NL 70 5 70 NL 400 400 0.4 30 400 700 200 155,000 260,000 84,500 85,500 20,000 70,000 50 6,000 6,900 8,500 NL 25,000 5,000 30,000 NL 28,500 25,000 400 12,500 NL NL NL 15,000NA ‐ Not AnalyzedND ‐ Not Detected J ‐ Estimated ConcentrationBold ‐ Concentration exceeds 2L Standard. Shaded ‐ Concentration exceeds GCL.Date CollectedCONTAMINANTS OF CONCERN/CONCENTRATION (µg/L)LeadC5‐C8 AliphaticsC9‐C18 AliphaticsC9‐C22 Aromatics1,2,4‐Trimethylbenzene1,3,5‐Trimethylbenzene1,2‐DichloroethaneEDB (504.1)1,2,3‐Trichlorobenzene2‐MethylnapthaleneXylenes (Total)MTBEIPEMW‐4MW‐5Naphthalenen‐Butylbenzenen‐Propylbenzenesec‐butylbenzeneIsopropylbenzeneMethylene ChlorideBenzeneTolueneEthylbenzeneANALYTICAL METHOD6200BWELL IDNOT SAMPLEDMW‐6MW‐7GCL (µg/L)2L Standard (µg/L)Bromomethane TABLE 4 (Cont)SUMMARY OF GROUNDWATER SAMPLING ANALYTICAL RESULTSFOUR CORNERS STORENASHVILLE, NCINCIDENT No. 126105/13/20087/1/20092/23/2010 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA ND ND ND ND10/6/2010 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND5/13/2008 ND ND NDNDND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA7/1/2009 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA ND ND ND ND10/6/2010 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND5/13/2008ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NANA7/1/2009ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA ND ND ND ND2/23/2010ND ND ND ND ND ND ND ND ND ND 1.3 J ND ND ND ND ND ND ND NA ND ND ND 12.310/6/2010ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND24.35/9/20111/16/2012ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA5/23/2012ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA1 600 600 500 20 70 0.02 6 70 70 NL 70 5 70 NL 400 400 0.4 30 400 700 200 155,000 260,000 84,500 85,500 20,000 70,000 50 6,000 6,900 8,500 NL 25,000 5,000 30,000 NL 28,500 25,000 400 12,500 NL NL NL 15,000NA ‐ Not AnalyzedND ‐ Not Detected J ‐ Estimated ConcentrationBold ‐ Concentration exceeds 2L Standard. Shaded ‐ Concentration exceeds GCL.ANALYTICAL METHOD6200BWELL ID Date CollectedCONTAMINANTS OF CONCERN/CONCENTRATION (µg/L)BenzeneTolueneEthylbenzeneXylenes (Total)MTBEIPEEDB (504.1)Naphthalenen‐ButylbenzeneIsopropylbenzeneNOT SAMPLEDNOT SAMPLED2L Standard (µg/L)GCL (µg/L)BromomethaneLeadWSW‐1WSW‐2WSW‐3Methylene Chloride1,2,3‐Trichlorobenzene2‐MethylnapthaleneC5‐C8 AliphaticsC9‐C18 AliphaticsC9‐C22 Aromaticsn‐Propylbenzene1,2,4‐Trimethylbenzene1,3,5‐Trimethylbenzene1,2‐Dichloroethanesec‐butylbenzeneNOT SAMPLED FIGURES FIGURE 1 Site Location Map Former Four Corners Store 6154 West Mount Drive Rocky Mount, North Carolina 27803 515 S. New Hope Rd., Suite 104 Raleigh, North Carolina 27610 540-343-6256 (office) 540-343-6259 (fax) NASHVILLE, NORTH CAROLINA Source: Delorme Topo USA ver. 7 Scale: 1:12,000 Contour Interval: 250 Feet Vertical Datum: National Geodetic Vertical Datum 1929 Horizontal Datum: North American Datum 1927 Project: 05-2012 GMR Latitude:35o 54’ 18.86” N Longitude: 77o 54’ 13.15” W Client: NCDENR CES Job #: 16.134 Date: 07/04/2012 SITE SITE MW-4REV0Site PlanFour Corners Store6154 West Mount Drive Rocky Mount, North Carolina 27803Figure TitleDRAWING NUMBERBYDATEREVCK.: APP'D.: DPKSCALE: 1" = 45'CES PROJ. NO.: 16.13405-2012 GMR515 S. New Hope Rd., Suite 104Raleigh, North Carolina 27610540-343-6256540-343-6259 (fax)Figure 207/04/2012DR.: KBBINCIDENT # 12610LEGENDMonitoring Well MW-1MW-1D MW-3 MW-6 MW-7 MW-2 MW-5Claude's Construction, Inc.VacantFormer Tank BasinWater Supply WellMobileHomeSepticTankPropaneASTWESTMOUNTDRIVES.OLDCARRIAGEROAD FIGURE 3 Potential Receptor Map Four Corners Store 6154 West Mount Drive Rocky Mount, North Carolina 27803 Note: WSW-2 was abandoned in March 2012. 515 S. New Hope Rd., Suite 104 Raleigh, North Carolina 27610 540-343-6256 (office) 540-343-6259 (fax) ROCKY MOUNT, NORTH CAROLINA Source: Geoeye Imagery Date: 08/10/2009 Latitude: 35o 54’ 18.86” N Longitude: 77o 54’ 13.15” W Project: 05-2012 GMR Client: NCDENR CES Job #: 16.134 Date: 07/04/ 2012 WSWͲ4 SITE WSW-1 WSW-2 WSW-3 5 REV0Contiguous Properties MapFour Corners Store6154 West Mount Drive Rocky Mount, North Carolina 27803Figure TitleDRAWING NUMBERBYDATEREVCK.: APP'D.: CFCSCALE: 1" = 300'CES PROJ. NO.: 16.13405-2012 GMR515 S. New Hope Rd., Suite 104Raleigh, North Carolina 27610540-343-6256540-343-6259 (fax)Figure 4JAN 18 2012DR.: DJFINCIDENT # 12610WESTS.OLDC O U N T R Y CARRIAGEROADDRIVEMOUNTWESTMOUNTDRIVES.OLDCARRIAGEROADSITE 4 3 2 1 6 7 8 9 11 10 R O A DROSCOE LANEREFERENCE: NASH COUNTY CONNECTGIS GEOGRAPHIC INFORMATION SYSTEM REV0Dissolved-Phase COC Map (ug/L)Four Corners Store6154 West Mount Drive Rocky Mount, North Carolina 27803Figure TitleDRAWING NUMBERBYDATEREVCK.: APP'D.: DPKSCALE: 1" = 45'CES PROJ. NO.: 16.13405-2012 GMR515 S. New Hope Rd., Suite 104Raleigh, North Carolina 27610540-343-6256540-343-6259 (fax)Figure 507/04/2012DR.: KBBINCIDENT # 12610LEGENDMonitoring WellClaude's Construction, Inc.VacantFormer Tank BasinWater Supply WellMobileHomeSepticTankPropaneASTBenzene 127Toluene 82.9Ethylbenzene 331Xylenes 978.8MTBE NDNaphthalene 208IPE NDEDB NDMWͲ1Benzene NDToluene NDEthylbenzene NDXylenes NDMTBE NDNaphthalene NDIPE NDEDB NDMWͲ2Benzene NDToluene NDEthylbenzene NDXylenes NDMTBE NDNaphthalene NDIPE NDEDB NDMWͲ7Benzene NDToluene NDEthylbenzene NDXylenes NDMTBE 6.9Naphthalene NDIPE NDEDB NDMWͲ5Benzene NDToluene NDEthylbenzene NDXylenes NDMTBE NDNaphthalene NDIPE NDEDB NDMWͲ6Benzene NDToluene NDEthylbenzene NDXylenes NDMTBE NDNaphthalene NDIPE NDEDB NDMWͲ3Benzene NDToluene NDEthylbenzene NDXylenes NDMTBE NDNaphthalene NDIPE NDEDB NDMWͲ4Benzene 3.1Toluene NDEthylbenzene NDXylenes NDMTBE NDNaphthalene NDIPE NDEDB NDMWͲ1DWESTMOUNTDRIVES.OLDCARRIAGEROAD MW-4REV0Benzene in Groundwater Isoconcentration Map (ug/L)Four Corners Store6154 West Mount Drive Rocky Mount, North Carolina 27803Figure TitleDRAWING NUMBERBYDATEREVCK.: APP'D.: DPKSCALE: 1" = 45'CES PROJ. NO.: 16.13405-2012 GMR515 S. New Hope Rd., Suite 104Raleigh, North Carolina 27610540-343-6256540-343-6259 (fax)Figure 607/04/2012DR.: KBBINCIDENT # 12610LEGENDMonitoring Well MW-1MW-1D MW-3 MW-6 MW-7 MW-2 MW-5Claude's Construction, Inc.VacantFormer Tank BasinWater Supply WellMobileHomeSepticTankPropaneASTWESTMOUNTDRIVES.OLDCARRIAGEROADBenzene Concentration (ug/L)Not Detected(ND)(ND)(ND)(ND)(ND)(ND)(13.1)(127)1.0ESTIMATED EXTENTOF BENZENECONTAMINATION(13.1)(ND) MW-4REV0Naphthalene in Groundwater Isoconcentration Map (ug/L)Four Corners Store6154 West Mount Drive Rocky Mount, North Carolina 27803Figure TitleDRAWING NUMBERBYDATEREVCK.: APP'D.: DPKSCALE: 1" = 45'CES PROJ. NO.: 16.13405-2012 GMR515 S. New Hope Rd., Suite 104Raleigh, North Carolina 27610540-343-6256540-343-6259 (fax)Figure 707/04/2012DR.: KBBINCIDENT # 12610LEGENDMonitoring Well MW-1MW-1D MW-3 MW-6 MW-7 MW-2 MW-5Claude's Construction, Inc.VacantFormer Tank BasinWater Supply WellMobileHomeSepticTankPropaneASTWESTMOUNTDRIVES.OLDCARRIAGEROADNaphthalene Concentration (ug/L)Not Detected(ND)(ND)(ND)(ND)(ND)(ND)(ND)(743)6.0ESTIMATED EXTENTOF NAPHTHALENECONTAMINATION(743)(ND) MW-4REV0Groundwater Potentiometric Surface Map (ft)Four Corners Store6154 West Mount Drive Rocky Mount, North Carolina 27803Figure TitleDRAWING NUMBERBYDATEREVCK.: APP'D.: DPKSCALE: 1" = 45'CES PROJ. NO.: 16.13405-2012 GMR515 S. New Hope Rd., Suite 104Raleigh, North Carolina 27610540-343-6256540-343-6259 (fax)Figure 807/04/2012DR.: KBBINCIDENT # 12610LEGENDMonitoring Well MW-1MW-1D MW-3 MW-6 MW-7 MW-2 MW-5Claude's Construction, Inc.VacantFormer Tank BasinWater Supply WellMobileHomeSepticTankPropaneASTWESTMOUNTDRIVES.OLDCARRIAGEROADGroundwater Elevation (ft)05/23/2012Implied GroundwaterElevation (ft)Implied GroundwaterFlow(98.98)(96.59)(98.07)(99.50)(95.39)(99.03)(95.83)(98.83)(99.50)9896.0 97.0 98.0 9 9 .0 9 9 .0 98.0 97.0 9 6 .0 97.0 APPENDICES APPENDIX A Laboratory Certificates of Analysis and Chain-of-Custody Documentation