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Home My WebLink About10036_South End Transit_Welders Supply Phase II Report FINAL-OCR DELIVERING SUSTAINABLE SOLUTIONS IN A MORE COMPETITIVE WORLD Phase II Environmental Site Assessment Welders Supply of Charlotte 2300 South Boulevard Charlotte, North Carolina December 2006 ERM NC, PC 8000 Corporate Center Drive Suite 200 Charlotte, North Carolina 28226 www.erm.com Cherokee Investment Partners Phase II Environmental Site Assessment Welders Supply of Charlotte 2300 South Boulevard Charlotte, Mecklenburg County, North Carolina December 2006 Project No. 55685 ________________________________ Alan Martin, P.G. Project Manager _________________________________ Thomas M. Wilson, P.G. Principal-In-Charge ERM NC, PC 8000 Corporate Center Drive Suite 200 Charlotte, North Carolina 28226 (704) 541-8345 (702) 541-8416 (fax) http://www.erm.com ERM NC, PC i WELDERS SUPPLY PHASE II REPORT FINAL.DOC TABLE OF CONTENTS 1.0 INTRODUCTION 1 1.1 BACKGROUND 1 2.0 ASSESSMENT ACTIVITIES 2 3.0 RESULTS 5 4.0 SUMMARY AND CONCLUSIONS 8 LIST OF FIGURES Figure 1 Topographic Site Location Map Figure 2 Site Layout Map Figure 3 Soil Sample Results Map Figure 4 Groundwater Sample Results Map LIST OF TABLES Table 1 Monitor Well Construction Table 2 Soil Sample Analytical Results Table 3 Groundwater Sample Analytical Results LIST OF APPENDICES APPENDIX A: Soil Boring Logs APPENDIX B: Laboratory Analytical Data Sheets ERM NC, PC 1 WELDERS SUPPLY PHASE II REPORT FINAL.DOC 1.0 INTRODUCTION On October 16 through 20, 2006, ERM NC, PC (ERM) performed a Phase II Environmental Site Assessment (ESA) on behalf of Cherokee Investment Partners at the Welders Supply of Charlotte property (hereafter referred to as “the subject site“ or “the subject property”) located at 2300 South Boulevard, in Charlotte, Mecklenburg County, North Carolina. The purpose of the Phase II ESA site investigation was to investigate potential areas of concern identified during a previous Phase I ESA of the site conducted by ERM in September 2006, as discussed below. 1.1 BACKGROUND A Phase I ESA was conducted by ERM at the subject property in September 2006. As indicated in the Phase I ESA report, a welding supply company operated at the subject property from 1960 through the late 1990s. Previous land use at the site consisted of single-family residences. The location of the subject property is presented on Figure 1. Figure 2 presents the current site layout. The Phase I ESA identified the following potential environmental concern: • Three underground storage tanks (USTs) were previously utilized at the subject property for storage of petroleum products. The first UST is reported to be a 2,000-gallon heating oil (fuel oil) UST installed in May 1956 and permanently closed in 1985. The second UST is reportedly a 1,500-gallon heating oil UST installed in May 1956 and permanently closed in 1985. The third UST is reported to be a 1,000-gallon gasoline UST installed in May 1956 and permanently closed in 1974. All of these tanks were closed or abandoned in place prior to the enactment of Federal UST regulations in 1988. No additional information was available regarding the closure of these tanks. It is possible that undocumented releases from these USTs may have affected soil or groundwater quality in these areas. • Several properties within a ¼-mile radius of the subject site were listed in the database search as sites with documented groundwater or soil contamination or possession of underground storage tanks. The topography and suspected regional shallow groundwater flow direction indicates contamination from these sites should migrate away from the subject site, however, there is potential for off-site contamination to adversely impact the subject site. ERM NC, PC 2 WELDERS SUPPLY PHASE II REPORT FINAL.DOC 2.0 PHASE II ASSESSMENT ACTIVITIES On October 17 and 19, 2006, ERM supervised the installation of ten direct push (Geoprobe®) soil borings. Seven of the direct push soil borings were converted to temporary monitor wells for purposes of collecting groundwater samples and identifying the depth to the water table. Six soil samples (WS-SB-3, 4, 6, 7, 9 and WS-HA-10) and seven groundwater samples (WS-SB-1, 2, 4, 5, 6, 8 and 9) were collected and submitted for laboratory analysis. The direct push soil borings and temporary monitor wells were installed by Probe Technology, Inc. of Concord, North Carolina, using direct push, or Geoprobe® drilling and sampling equipment. The direct push sampling method uses a small truck or all terrain vehicle mounted hydraulic jack mechanism to drive a 2-inch diameter hollow steel probe (macro-core) with a polyethylene soil-sampling sleeve into the ground to the desired depth prior to sampling. Using the macro-core sampler, soil samples were collected continuously until the target soil sampling depth was reached or refusal was met. All downhole sampling equipment was cleaned via a high-temperature/high-pressure water wash (steam cleaner) before and between each boring. Soils were logged in the field by an ERM geologist and screened for the presence of volatile organic compounds (VOCs) via a photo-ionization detector (PID) and the headspace field screening method. In general, the shallow soils at the site were comprised of clayey silts grading to fine sandy silts at depth. Soil boring logs and field screening data and can be referenced in Appendix A. Soil samples intervals for laboratory analyses were chosen based on PID readings, visual and olfactory observations and the suspected depth of the potential concern. Soil samples were placed in laboratory-supplied sample containers and then placed in a cooler with ice for storage and delivery to Prism Laboratories of Charlotte, North Carolina for analyses. Soil samples collected from the site were analyzed for: volatile organic compounds (VOCs) by EPA Method 8260, polycyclic aromatic hydrocarbons (PAHs) by EPA Method 8270, Metals by EPA Methods 6010B and 7471, diesel range organics (DRO) and gasoline range organics (GRO) by TPH Method 8015B. ERM and Prism Laboratories adhered to appropriate chain-of- custody procedures. Soil boring WS-SB-3 and WS-SB-4 were advanced near the central portion of the subject property to assess potential impacts to soil from two heating ERM NC, PC 3 WELDERS SUPPLY PHASE II REPORT FINAL.DOC oil USTs located at the north side of the main warehouse. Two soil samples were collected at approximately 6 to 8 feet below ground surface in each of these borings and analyzed for DRO and GRO. Soil borings WS-SB-6 and WS-SB-7 were advanced adjacent to the former gasoline UST. A soil sample collected from the WS-SB-6 boring at a depth of 8 to 10 feet was analyzed for VOCs and PAHs. A soil sample from the WS-SB- 7 boring collected at a depth of 8 to 10 feet was analyzed for DRO and GRO. One soil sample (WS-SB-9) was collected adjacent to two 55-gallon drums north of the paint shed at a depth of 2 to 4 feet below ground surface and analyzed for VOCs. One hand auger boring (WS-HA-10) was advanced along the western edge of the warehouse to assess potential impacts due to releases from a 2-inch diameter steel drain outlet located on the warehouse wall and extending from the interior of the facility. A soil sample was collected from this hand auger boring from 0 to 2 feet and analyzed for VOCs and PAHs. Following the completion of soil sample collection, temporary monitor wells were installed in the WS-SB-1, 2, 3, 4, 5 6, 8, and 9 borings. The temporary monitor wells were installed at depths ranging from 24 to 40 feet below ground surface. These depths represent where the direct push probe encountered saturated soil for groundwater sampling. Each temporary monitor well was installed with 1-inch diameter PVC well screen and riser, filter sand and bentonite seal in general accordance with North Carolina Well Construction Standards (15A NCAC 2C). Each well was fitted with locking, expandable well caps. Following construction, all new monitor wells were developed by purging a minimum of five well bore volumes from the well utilizing a combination of a new, disposable bailer and previously decontaminated peristaltic pump. After development, all monitor wells were sampled using low-flow sampling methods to minimize turbidity present in the samples and to minimize the volume of groundwater potentially requiring special handling and disposal procedures. Prior to purging and sampling, depth-to- groundwater data were recorded for each monitor well. The top of well casing elevations were determined by surveying techniques and using a temporary benchmark located at well WS-GW-6. Monitor well construction details and groundwater elevation data are presented in Table 1. The depth-to-groundwater ranged from 17.9 feet below ground surface in WS-GW-5 to 28.9 feet in WS-GW-2. Based on the ground water elevation measurements and local land surface topography, the groundwater flow ERM NC, PC 4 WELDERS SUPPLY PHASE II REPORT FINAL.DOC direction beneath the subject property appears to be to the northwest toward the light rail line. Groundwater samples collected from WS-GW-1 and 2 were analyzed for VOCs by Method 8260B to evaluate ground water quality migrating onto the subject property from the east. Groundwater samples collected from WS-GW-4, 5, 6 and 8 were analyzed for VOCs by Method 8260B PAHs by Method 8270. The WS-GW-4 sample was collected immediately downgradient of the heating oil USTs located at the north side of the main warehouse. The WS-GW-5 and WS-GW-6 samples were collected to evaluate groundwater quality downgradient of the former maintenance garage located at the north side of the property and evaluate any potential impacted groundwater migrating onto the subject property from the adjacent parcel to the north. The groundwater sample from WS-GW-9 were analyzed for VOCs by Method 8260B, PAHs by Method 8270 and Metals by Methods 6010 B and 7471 to evaluate groundwater quality downgradient of the former paint shed. Samples collected from each temporary well were labeled with an identification of GW, i.e., the sample collected and labeled WS-GW-4 is the groundwater from the boring labeled WS-SB-4. ERM NC, PC 5 WELDERS SUPPLY PHASE II REPORT FINAL.DOC 3.0 ASSESSMENT RESULTS Soil analytical results are summarized in Table 2 and groundwater analytical results are summarized in Table 3. Sample locations and analytical results are illustrated in Figures 3 and 4 for soil and groundwater, respectively. Soil boring logs including field screening values are presented in Appendix A. The laboratory analytical data reports are presented in Appendix B. For comparison purposes, the soil results are compared to the North Carolina Department of Environment and Natural Resources (NCDENR) Division of Water Quality – Aquifer Protection Section’s Soil-to- Groundwater Cleanup Levels, Division of Waste Management (DWM) UST Section’s Maximum Soil Contaminant Concentrations (MSCCs) or Division of Waste Management – Superfund Section’s Inactive Hazardous Sites Branch Remediation Goals (IHSB RG) levels. ERM also compared the metals concentrations in soils to the common range of naturally occurring metals in soils, as published in EPA’s Hazardous Waste Land Treatment, SW- 874, Table 6.46, dated April 1983. Also presented for comparison purposes are naturally occurring concentrations of common metals in the eastern United States as reported by the United States Geological Survey (USGS). These values are shown in Table 2 of this report, as applicable. Groundwater analytical results are compared to the North Carolina Groundwater Standards (NC 15A NCAC 2L 0.0202(g)) which are identified in Table 3. Soils Soil samples (WS-SB-3, WS-SB-7 and WS-SB-4) were submitted to the laboratory for DRO and GRO analysis. Diesel range organics were detected in the WS-SB-3 soil sample at 16 milligrams per kilogram (mg/kg) which is above the NCDENR DWM UST Section Action Level of 10 mg/kg. The presence of the elevated DRO in this soil sample may be attributed to undocumented releases from the nearby heating oil USTs. No GRO was detected in the WS-SB-3 soil sample and no DRO or GRO were detected in the WS-SB-4 soil sample. The soil sample from WS-SB-6 was submitted to the laboratory for VOC and PAH analyses and the soil sample from WS-SB-7 was submitted for DRO and GRO analyses. Low concentrations of acetone, cis-1,2 dichloroethene, and trichloroflouromethane were detected in the WS-SB-6 soil sample in concentrations below all applicable NCDENR cleanup levels. No PAHs were detected in the WS-SB-6 soil sample. No DRO or GRO was detected in the WS-SB-7 soil sample. The presence of the low ERM NC, PC 6 WELDERS SUPPLY PHASE II REPORT FINAL.DOC VOC concentrations in the WS-SB-6 soil sample may be attributable to minor spills during maintenance activities at the nearby garage facility. Soil sample WS-SB-9 was submitted to the laboratory for VOC and metals analyses. Acetone was detected at 0.19 mg/kg which is below the NCDENR Aquifer Protection Section Soil-to-Groundwater Cleanup Level of 2.81 mg/kg. Chromium was detected in the WS-SB-9 soil sample at 36 mg/kg which is slightly above the NCDENR Aquifer Protection Section Soil-to-Groundwater Cleanup Level of 27 mg/kg for this naturally occurring mineral. No potential source of chromium has been identified in this area and the concentration detected in the WS-SB-9 soil is within the range of naturally occurring concentrations in Piedmont soils. No other metals were detected at levels above the applicable NCDENR cleanup levels. The soil sample WS-HA-10 was submitted to the laboratory for VOC and PAH analysis. No VOCs were detected. Several PAHs were detected in the WS-HA-10 soil sample above the applicable NCDENR Aquifer Protection Section’s cleanup levels. Benzo(a)anthracene was detected at 2.1 mg/kg, compared to the NCDENR Aquifer Protection Section’s cleanup level for this compound of 0.34 mg/kg. Benzo(a)pyrene was detected at 1.9 mg/kg which exceeds the NCDENR Aquifer Protection Section’s cleanup level of 0.091 mg/kg. Benzo(b)fluoranthene was detected at 2.1 mg/kg which exceed the NCDENR Aquifer Protection Section’s cleanup level of 1.0 mg/kg and dibenzo(a,h) anthracene was detected 0.31 mg/kg, compared to the NCDENR Aquifer Protection Section’s cleanup level of 0.17 mg/kg. Other PAHs were detected in this soil sample in concentrations below all applicable NCDENR Aquifer Protection Section cleanup levels. The source of these PAHs in the shallow soil has not been identified but appears to be from the discharge which previously emanated from the nearby drain from the interior of the facility. Groundwater The groundwater levels in temporary monitor wells at the site varied from 17.9 feet below ground surface to 28.9 feet below ground surface. Groundwater samples collected from WS-GW-1, WS-GW-2 and WS-GW-4 were submitted to the laboratory for VOC analyses. Chloroform was detected in the WS-GW-1 groundwater sample at 29 micrograms per liter (µg/L). The North Carolina Groundwater Standard for chloroform is 70 µg/L. No other VOCs were reported in the WS-GW-1, WS-GW-2 or ERM NC, PC 7 WELDERS SUPPLY PHASE II REPORT FINAL.DOC WS-GW-4 groundwater samples. No PAHs were detected in the WS-GW-4 sample. Groundwater samples from temporary monitor wells WS-GW-5, WS-GW-6 and WS-GW-8 were analyzed for VOC and SVOCs. Trichloroethene (TCE) was detected in the WS-GW-6 and WS-GW-8 groundwater samples at 3.9 µg/L and 3.0 µg/L, respectively. These concentrations slightly exceed the North Carolina Groundwater Standard for this compound of 2.8 µg/L. Cis-1,2 dichloroethene was detected in the WS-GW-6 and WS-GW-8 groundwater samples in concentrations below the applicable North Carolina Groundwater Standard. Trichoroflouromethane was detected in the WS-GW-6 sample at a concentration below the applicable North Carolina Groundwater Standard. No VOCs were reported in the WS-GW-5 ground water sample and no PAHs were detected in the WS-GW-5, WS-GW-6 and WS-GW-8 samples. The presence of the low VOC concentrations in the WS-SB-6 and WS-GW-8 groundwater samples may be attributable to minor spills during maintenance activities at the nearby garage facility. As noted above, cis-1,2 dichloroethene was also detected in the WS-SB-6 soil sample. The groundwater sample from temporary monitor well WS-GW-9 was analyzed for VOCs and metals. No VOCs were detected in this groundwater sample. Barium and lead were detected in the WS-GW-9 sample in concentrations below the applicable North Carolina Groundwater Standards. ERM NC, PC 8 WELDERS SUPPLY PHASE II REPORT FINAL.DOC 4.0 SUMMARY AND CONCLUSIONS On October 16-20, 2006, ERM conducted a Phase II ESA to evaluate subsurface conditions at the Welders Supply of Charlotte property located at 2300 South Boulevard, Charlotte, Mecklenburg County, North Carolina. A summary of the findings of the Phase II ESA is provided below. Six soil samples were collected via direct push and hand auger methods to evaluate soil quality at the subject property. Diesel range organics were detected in one sample (WS-SB-3) at 16 mg/kg which is above the NCDENR UST Section action level (10 mg/kg). The presence of the elevated DRO in this soil sample may be attributed to undocumented releases from the nearby heating oil USTs. No VOCs or PAHs were detected in a nearby groundwater sample (WS-SB-4). Additional investigation of the extent of petroleum-affected soil may be required by NCDENR. Slightly elevated concentrations of trichloroethene were detected in two groundwater samples (WS-GW-6 and WS-GW-8) collected from downgradient of the former garage near the northwest corner of the property. The maximum TCE concentration detected is 3.9 µg/L, compared to the North Carolina Groundwater Standard of 2.8 µg/L. Low concentrations of VOCs were also detected in one soil sample collected from this area at concentrations below all applicable NCDENR cleanup levels. The presence of the VOCs detected in the soil and groundwater in this area may be attributable to minor spills during maintenance activities at the nearby garage facility. Additional investigation of the extent of trichloroethene-affected groundwater may be required by NCDENR. Chromium was detected in one sample at 36 mg/kg which slightly exceeds the NCDENR Aquifer Protection Section’s Cleanup Level of 27 mg/kg. No potential source of chromium has been identified in this area and the detected concentration is within the range of naturally occurring concentrations of chromium in Piedmont soils. No additional investigation or remediation of the chromium detected in the soil in this area is warranted. No other metals or VOCs were identified in excess of the NCDENR Aquifer Protection Section’s Cleanup Levels. Elevated concentrations of PAHs, including benzo(a)anthracene, benzo(a)pyrene, benzo(b)flouranthene, and dibenzo(a,h)anthracene, were detected in the WS-HA-10 soil sample in concentrations above the applicable NCDENR Aquifer Protection Section clean up levels. A potential source for these SVOCs could be a drain exiting the warehouse building interior adjacent to the sample location. The source of these SVOCs in the shallow soil has not been identified but appears to be from the discharge which previously emanated from the nearby drain from the interior of the facility. No ground water sample was collected in the vicinity of the SVOC-affected soil. Additional investigation of the extent of PAH-affected soil may be required by NCDENR. ERM NC, PC 9 WELDERS SUPPLY PHASE II REPORT FINAL.DOC Figures Source: Charlotte East, NC 7.5 Minute Topographic Quadrangle; 1988; Contour Interval = 10 feet Figure ERM NC, PC CHARLOTTE, NORTH CAROLINA FORMER WELDERS SUPPLY FACILITY 2300 SOUTH BOULEVARD SITE LOCATION MAP 1 0 0.1 0.2 0.3 0.4 0.5 mi SITE Source: Google Earth Satellite Imagery, Circa 2005 Figure ERM NC, PC CHARLOTTE, NORTH CAROLINA FORMER WELDERS SUPPLY FACILITY 2300 SOUTH BOULEVARD SITE LAYOUT MAP 2 LIGHT RAIL CONSTRUCTION FORMER LIDA MANUFACTURING SOUTH BOULEVARD FORMER GEORGIA CAROLINA CHEMICALS PARKING OFFICES WAREHOUSE GARAGE FORMER COMPRESSED GAS ASTs FORMER GASOLINE UST RA I L R O A D S P U R PAINT SHED FORMER COMPRESSED GAS ASTs CYLINDER STORAGE BUILDING HEATING OIL USTs Source: Google Earth Satellite Imagery, Circa 2005 Figure ERM NC, PC SOIL SAMPLE LOCATIONS & RESULTS FORMER WELDERS SUPPLY FACILITY 32300 SOUTH BOULEVARD CHARLOTTE, NORTH CAROLINA SOUTH BOULEVARD PARKING OFFICES WAREHOUSE WS-SB-4 (6-8) RG Diesel Range Organics ND 10 Gasoline Range Organics ND 10 WS-SB-3 (6-8) RG Diesel Range Organics 16 10 Gasoline Range Organics ND 10 WS-SB-6 (8-10) RG VOCs Acetone 0.065 2.81 cis-1,2 Dichloroethene 0.045 0.35 Trichlorofluoromethane 0.0053 J NE All Other Compounds ND NE PAHs ND NE WS-SB-7 (8-10) RG Diesel Range Organics ND 10 Gasoline Range Organics ND 10 WS-SB-9 (2-4) RG VOCs Acetone 0.19 2.81 All Other Compounds ND NE Metals Mercury 0.03 NE Barium 110 848 Arsenic 2.1 NE Cadmium 0.40 NE Chromium 36 27 Lead 26 270 Silver 0.12 NE WS-HA-10 (0-2) RG VOCs ND NE PAHs 2-Methylnaphthalene 0.13 J 3 Acenaphthene 0.72 8 Anthracene 1.1 995 Benzo(a)anthracene 2.1 0.34 Benzo(a)pyrene 1.9 0.091 Benzo(b)fluoranthene 2.1 1.0 Benzo(g,h,l)perylene 0.78 6,720 Benzo(k)fluoranthene 1.4 12 Chrysene 2.3 38 Dibenzo(a,h)anthracene 0.31 0.17 Fluoranthene 3.9 276 Fluorene 0.51 44 Indeno(1,2,3-od)pyrene 1.0 3.0 Naphthalene 0.49 0.58 Phenanthrene 3.7 60 Pyrene 3 286 All Other Compounds ND NE WS-SB-1 (Depth in Feet) RG Detected soil contaminant concentrations in mg/kg with regulatory standards (Maximum Soil Contaminant Concentrations). Concentrations above regulatory standards shown in bold font. Soil Sample Location ND Not Detected NE Not Established Figure ERM NC, PC GROUNDWATER SAMPLE LOCATIONS & RESULTS FORMER WELDERS SUPPLY FACILITY 42300 SOUTH BOULEVARD CHARLOTTE, NORTH CAROLINA LIGHT RAIL CONSTRUCTION SOUTH BOULEVARD PARKING OFFICES WAREHOUSE WS-GW-1 Results Summary 2L STD Detected groundwater contaminant concentrations in µg/L with regulatory standards. Concentrations above regulatory standards shown in bold font. WS-GW-1 2L STD VOCs Chloroform 29 70 All other VOCs ND NE WS-GW-2 2L STD VOCs ND NE WS-GW-4 2L STD VOCs ND NE PAHs ND NE WS-GW-5 2L STD VOCs ND NE PAHs ND NE WS-GW-9 2L STD VOCs ND NE Metals Barium 46 2,000 Lead 2.0 15 All other metals ND NE WS-GW-8 2L STD VOCs cis-1,2 Dichloroethene 3.5 70 Trichloroethene 3.0 2.8 All other VOCs ND NE PAHs ND NE WS-GW-6 2L STD VOCs cis-1,2 Dichloroethene 31 70 Trichloroethene 3.9 2.8 Trichlorofluromethane 0.76 2,100 All other VOCs ND NE PAHs ND NE Groundwater Sample Location ND Not Detected NE Not Established Tables TA B L E 1 MO N I T O R W E L L C O N S T R U C T I O N FO R M E R W E L D E R S S U P P L Y F A C I L I T Y 23 0 0 S O U T H B O U L E V A R D CH A R L O T T E , M E C K L E N B U R G C O U N T Y , N O R T H C A R O L I N A Mo n i t o r We l l I D Da t e In s t a l l e d Da t e W a t e r Le v e l Me a s u r e d We l l C a s i n g De p t h (f e e t B G S ) Sc r e e n e d In t e r v a l (f e e t B G S ) Bo t t o m o f We l l (f e e t B G S ) Gr o u n d Su r f a c e Ele v a t i o n (f e e t ) To p - o f - C a s i n g Ele v a t i o n (f e e t ) De p t h t o Wa t e r (f e e t B G S ) De p t h t o Wa t e r (f e e t B T O C ) Gr o u n d w a t e r El e v a t i o n (f e e t ) Fr e e Pr o d u c t Th i c k n e s s (f e e t ) C o m m e n t s WS - G W - 1 1 0 / 1 7 / 0 6 1 0 / 1 9 / 0 6 1 9 1 9 - 3 4 3 4 1 0 6 . 6 6 1 0 7 . 3 6 2 6 . 6 7 2 7 . 3 7 7 9 . 9 9 N o n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l WS - G W - 2 1 0 / 1 7 / 0 6 1 0 / 1 8 / 0 6 2 0 2 0 - 4 0 4 0 1 0 9 . 5 6 1 0 9 . 8 6 2 8 . 8 6 2 9 . 1 6 8 0 . 7 0 N o n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l WS - G W - 4 1 0 / 1 7 / 0 6 1 0 / 1 9 / 0 6 1 4 1 4 - 2 4 2 4 1 0 0 . 7 8 1 0 2 . 2 8 2 0 . 5 1 2 2 . 0 1 8 0 . 2 7 N o n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l WS - G W - 5 1 0 / 1 9 / 0 6 1 0 / 2 3 / 0 6 1 6 . 5 1 6 . 5 - 2 6 . 5 2 6 . 5 2 9 7 . 4 9 9 8 . 8 9 1 7 . 8 5 1 9 . 2 5 7 9 . 6 4 N o n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l WS - G W - 6 1 0 / 1 7 / 0 6 1 0 / 2 3 / 0 6 1 9 . 8 1 9 . 8 - 2 9 . 8 2 9 . 8 5 9 9 . 7 5 1 0 0 . 0 0 2 0 . 1 4 2 0 . 3 9 7 9 . 6 1 N o n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l WS - G W - 8 1 0 / 1 9 / 0 6 1 0 / 2 3 / 0 6 1 6 . 6 1 6 . 6 - 2 6 . 6 2 6 . 6 0 9 7 . 9 6 9 9 . 2 1 1 8 . 5 3 1 9 . 7 8 7 9 . 4 3 N o n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l WS - G W - 9 1 0 / 1 7 / 0 6 1 0 / 2 3 / 0 6 1 5 . 4 1 5 . 4 - 2 5 . 4 2 5 . 4 4 9 7 . 7 9 9 9 . 6 9 1 9 . 1 3 2 1 . 0 3 7 8 . 6 6 N o n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l El e v a t i o n s r e f e r e n c e d t o t e m p o r a r y b e n c h m a r k a s s i g n e d a n e l e v a t i o n o f 1 0 0 . 0 0 f e e t a b o v e m e a n s e a l e v e l . Te m p o r a r y b e n c h m a r k l o c a t e d a t W S - G W - 6 / W S - S B - 6 W e l d e r S u p p l y T a b l e s . x l s \ W e l l C o n s t Pa g e 1 o f 1 TA B L E 2 SO I L S A M P L E A N A L Y T I C A L R E S U L T S FO R M E R W E L D E R S S U P P L Y F A C I L I T Y 23 0 0 S O U T H B O U L E V A R D CH A R L O T T E , M E C K L E N B U R G C O U N T Y , N O R T H C A R O L I N A Page 1 of 2 Sa m p l e I D Da t e De p t h (f e e t B G S ) Acetone cis-1-2-Dichloroethene Trichlorofluromethane All Other Compounds Barium Arsenic Cadmium ChromiumLeadSilver WS - S B - 3 1 0 / 1 7 / 0 6 6 - 8 < 1 16 ND -- - - - - - - - - - - - - - - - - - - -- WS - S B - 4 1 0 / 1 7 / 0 6 6 - 8 < 1 N D N D -- - - - - - - -- -- - - - - - - - - -- WS - S B - 6 1 0 / 1 7 / 0 6 8 - 1 0 2 . 0 - - - - 0 . 0 6 5 0 . 0 4 5 0 . 0 0 5 3 J N D - - -- - - - - - - - - -- WS - S B - 7 1 0 / 1 7 / 0 6 8 - 1 0 < 1 N D N D -- - - - - - - -- -- - - - - - - - - -- WS - S B - 9 1 0 / 1 7 / 0 6 2 - 4 < 1 0 - - - - 0 . 1 9 N D N D N D 1 1 0 2 . 1 0 . 4 0 J 36 26 0 . 1 2 J 0 . 0 3 WS - H A - 1 0 1 0 / 1 7 / 0 6 0 - 2 < 1 - - - - N D N D N D N D - - - - - - - - - - - - - - 10 1 0 2 . 8 0 . 3 5 3 1 N E 8 4 8 N E N E 2 7 2 7 0 N E N E 40 1 0 2 . 8 1 0 . 6 9 N E N E 8 4 8 N E N E 2 7 2 7 0 N E N E NE N E 1 4 , 1 2 7 4 2 . 9 3 8 6 N E 5 , 3 7 5 0 . 3 9 0 3 7 . 0 2 1 1 4 0 0 3 9 1 6 . 1 1 NE N E 5 4 , 3 2 1 1 4 6 2 , 0 0 0 N E 6 6 , 5 7 7 1 . 5 9 4 5 1 4 4 8 8 0 0 5 , 1 1 0 6 1 . 6 -- - - - - - - - - - - 0 . 5 2 4 . 8 N E 3 3 1 4 0 . 3 0 . 0 8 1 Na t u r a l l y O c c u r r i n g M e t a l s C o n c e n t r a t i o n 4 - R a n g e -- - - - - - - - - - - < 1 - 3 . 3 < 0 . 1 - 7 3 N E 1 - 1 , 0 0 0 < 1 0 - 3 0 0 < 0 . 1 - 3 . 9 0 . 0 1 - 3 . 4 Tr a c e E l e m e n t C o n t e n t o f N a t u r a l S o i l s 5 - A v e r a g e -- - - - - - - - - - - N E 5 0 . 0 6 1 0 0 1 0 0 . 3 0 . 0 3 Tr a c e E l e m e n t C o n t e n t o f N a t u r a l S o i l s 5 - R a n g e -- - - - - - - - - - - 2 - 1 0 1 - 5 0 0 . 0 1 - 0 . 7 1 - 1 , 0 0 0 2 - 2 0 0 < 0 . 1 - 2 0 . 0 1 - 0 . 3 On l y d e t e c t e d c o m p o u n d s a r e s h o w n i n t a b l e 1 - N C D E N R U S T S e c t i o n A c t i o n L e v e l mg / k g = M i l l i g r a m s p e r k i l o g r a m 2 - A q u i f e r P r o t e c t i o n S e c t i o n C l e a n U p L e v e l BG S = B e l o w g r o u n d s u r f a c e 3 - N C R i s k A n a l y s i s F r a m e w o r k ( d r a f t , 1 9 9 6 ) ND - N o t D e t e c t e d a t M e t h o d D e t e c t i o n L i m i t 4 - U S G S P r o f e s s i o n a l P a p e r 1 2 7 0 " E l e m e n t a l C o n c e n t r a t i o n s I n S o i l s a n d S u r f i c i a l M a t e r i a l s o f t h e C o n t e r m i n o u s NE = N o t e s t a b l i s h e d Un i t e d S t a t e s " , H . T . S h a c k l e t t e a n d J . G . B o e r n g e n , 1 9 8 4 . V a l u e s f o r E a s t e r n U n i t e d S t a t e s p r e s e n t e d J - E s t i m a t e d v a l u e b e t w e e n R e p o r t i n g L i m i t a n d M e t h o d D e t e c t i o n L i m i t 5 - B a c k g r o u n d c o n c e n t r a t i o n s o f m e t a l s p e r T a b l e 6 . 4 6 o f E P A S W - 8 7 4 , p a g e 2 7 3 . Re s u l t s s h o w n i n b o l d e x c e e d U S T s e c t i o n a c t i o n l e v e l s o r S o i l - G r o u n d w a t e r Cl e a n u p L e v e l , w h e r e a p p l i c a b l e -- = N o t A n a l y z e d Na t u r a l l y O c c u r r i n g M e t a l s C o n c e n t r a t i o n 4 - M e a n ME T A L S M e t h o d 6 0 1 0 B ( m g / k g ) So i l - G r o u n d w a t e r C l e a n u p L e v e l 2 VO L A T I L E O R G A N I C C O M P O U N D S b y E P A 8 2 6 0 B ( m g / k g ) Field Screening Volatile organic compounds - ppm (PID) Diesel Range Organics (DRO) TPH Method 8015B (mg/kg) Gasoline Range Organics (GRO) TPH Method 8015B (mg/kg) US T S e c t i o n A c t i o n L e v e l 1 MERCURY by EPA Method 7471 (mg/kg) EP A R e g i o n 9 P R G I n d u s t r i a l / C o m m e r c i a l 3 EP A R e g i o n 9 P R G R e s i d e n t i a l 3 TA B L E 2 ( C o n t i n u e d ) SO I L S A M P L E A N A L Y T I C A L R E S U L T S FO R M E R W E L D E R S S U P P L Y F A C I L I T Y 23 0 0 S O U T H B O U L E V A R D CH A R L O T T E , M E C K L E N B U R G C O U N T Y , N O R T H C A R O L I N A Page 2 of 2 Sa m p l e I D D a t e De p t h (f e e t B G S ) 2-Methylnaphthalene Acenaphthene Anthracene Benzo(a)anthracene Benzo(a)pyrene Benzo(b)fluoranthene Benzo(g,h,l)perylene Benzo(k)fluoranthene Chrysene Dibenzo(a,h)anthracene Fluoranthene Fluorene Indeno(1,2,3,-od)pyreneNaphthalenePhenanthrenePyreneAll Other Compounds WS - S B - 3 1 0 / 1 7 / 0 6 6 - 8 < 1 -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - WS - S B - 4 1 0 / 1 7 / 0 6 6 - 8 < 1 -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - WS - S B - 6 1 0 / 1 7 / 0 6 8 - 1 0 2 . 0 N D N D N D N D N D N D N D N D N D N D N D N D N D N D N D N D N D WS - S B - 7 1 0 / 1 7 / 0 6 8 - 1 0 < 1 -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - WS - S B - 9 1 0 / 1 7 / 0 6 2 - 4 < 1 0 -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - WS - H A - 1 0 1 0 / 1 7 / 0 6 0 - 2 < 1 0 . 1 3 J 0 . 7 2 1 . 1 2. 1 1 . 9 2 . 1 0. 7 8 1 . 4 2 . 3 0. 3 1 J 3. 9 0 . 5 1 1 0 . 4 9 3 . 7 3 N D 1. 7 8 . 2 1 0 0 0 0 . 3 4 0 . 0 9 1 1 . 2 6 , 7 0 0 1 2 3 8 0 . 1 7 2 8 0 4 4 3 . 3 0 . 5 8 6 0 2 9 0 N E 3 8 9 9 5 0 . 3 4 0 . 0 9 1 1 6 , 7 2 0 1 2 3 8 0 . 1 7 2 7 6 4 4 3 0 . 5 8 6 0 2 8 6 N E NE 3 , 6 8 2 2 1 , 8 9 6 0 . 6 2 1 0 . 0 6 2 0 . 6 2 1 N E 6 . 2 1 6 2 . 1 0 . 0 6 2 2 , 2 9 4 2 , 7 4 7 0 . 6 2 1 5 5 . 9 N E 2 , 3 1 6 N E NE 2 9 , 2 1 9 1 0 0 , 0 0 0 2 . 1 1 0 . 2 1 1 2 . 1 1 N E 2 1 . 1 2 1 1 0 . 2 1 1 2 2 , 0 0 0 2 6 , 2 8 1 2 . 1 1 1 8 8 N E 2 9 , 1 2 6 N E mg / k g = M i l l i g r a m s p e r k i l o g r a m J - E s t i m a t e d v a l u e b e t w e e n R e p o r t i n g L i m i t a n d M e t h o d D e t e c t i o n L i m i t BG S = B e l o w g r o u n d s u r f a c e 1 - N C D E N R U S T S e c t i o n A c t i o n L e v e l ND - N o t D e t e c t e d a t M e t h o d D e t e c t i o n L i m i t 2 - A q u i f e r P r o t e c t i o n S e c t i o n C l e a n U p L e v e l NE = N o t e s t a b l i s h e d 3 - E P A R e g i o n 9 P r e l i m i n a r y R e m e d i a t i o n G o a l TP H = T o t a l P e t r o l e u m H y d r o c a r b o n s R e s u l t s s h o w n i n b o l d e x c e e d R G l e v e l s o r S o i l - G r o u n d w a t e r C l e a n u p L e v e l , w h e r e a p p l i c a b l e - - = N o t A n a l y z e d PO L Y C Y C L I C A R O M A T I C H Y D R O C A R B O N S Me t h o d 8 2 7 0 ( m g / k g ) Field Screening Volatile organic compounds - ppm (PID) EP A R e g i o n 9 P R G I n d u s t r i a l / C o m m e r c i a l 3 So i l - G r o u n d w a t e r C l e a n u p L e v e l 2 EP A R e g i o n 9 P R G R e s i d e n t i a l 3 US T S e c t i o n A c t i o n L e v e l 1 TA B L E 3 SU M M A R Y O F G R O U N D W A T E R S A M P L I N G R E S U L T S FO R M E R W E L D E R S S U P P L Y F A C I L I T Y 23 0 0 S O U T H B O U L E V A R D CH A R L O T T E , M E C K L E N B U R G C O U N T Y , N O R T H C A R O L I N A Sa m p l e ID D a t e WS - G W - 1 1 0 / 1 9 / 0 6 2 9 N D N D N D N D - - - - - - - - - - WS - G W - 2 1 0 / 1 9 / 0 6 N D N D N D N D N D - - - - - - - - - - WS - G W - 4 1 0 / 1 9 / 0 6 N D N D N D N D N D N D - - - - - - - - WS - G W - 5 1 0 / 2 3 / 0 6 N D N D N D N D N D N D - - - - - - - - WS - G W - 6 1 0 / 2 3 / 0 6 N D 3 1 3. 9 0. 7 6 J N D N D - - - - - - - - WS - G W - 8 1 0 / 2 3 / 0 6 N D 3 . 5 3. 0 ND N D N D - - - - - - - - WS - G W - 9 1 0 / 2 3 / 0 6 N D N D N D N D N D - - 4 6 2 N D N D NC G r o u n d w a t e r 2 L S t a n d a r d 7 0 7 0 2 . 8 2 , 1 0 0 N E N E 2 , 0 0 0 1 5 N E 1 . 0 5 On l y d e t e c t e d c o m p o u n d s a r e s h o w n i n t a b l e µg / L = M i c r o g r a m s p e r l i t e r BG S = B e l o w g r o u n d s u r f a c e ND - N o t D e t e c t e d a t M e t h o d D e t e c t i o n L i m i t NE = N o t e s t a b l i s h e d - - = N o t A n a l y z e d J - E s t i m a t e d v a l u e b e t w e e n R e p o r t i n g L i m i t a n d M e t h o d D e t e c t i o n L i m i t *R e s u l t s s h o w n i n b o l d e x c e e d N o r t h C a r o l i n a G r o u n d w a t e r S t a n d a r d ( 2 L ) POLYCYCLIC AROMATIC HYDROCARBONS Method 8270 (µg/L) Trichlorofluromethane All Other Compounds VO L A T I L E O R G A N I C C O M P O U N D S b y E P A 8 2 6 0 B ( µ g / L ) Chloroform cis-1-2-Dichloroethene Trichloroethene MERCURY by EPA Method 7471 (µg/L) Barium Lead All Other Compounds ME T A L S Me t h o d 6 0 1 0 B ( µ g / L ) Appendix A Soil Boring Logs Stratigraphy Legend Abbreviations Asphalt/Gravel HA - Hand auger silty CLAY GP - Geoprobe clayey SILT TD - Total Depth of Boring silty SAND BGS - Below Ground Surface clayey SAND DTW- Depth to Water sandy SILT - Designates location of soil sample for lab analysis CLAY Water table level Logged by:Thomas Fisher - ERM Boring I.D. Depth Interval (feet) VOCs (ppm)Gr a p h i c L o g Sample Description WS-SB-1 0-0.5 <1 Grass and roots 10/17/2006 0.5-10 <1 Reddish orange clayey SILT 0-4' HA <1 4'-35' GP <1 <1 10-17 <1 Lt reddish orange clayey SILT 17-30 <1 Tan fine sandy SILT with weathered manganese fractures <1 <1 moisture at 28' BGS <1 <1 <1 <1 Boring terminated 25' BGS direct push well screen to 34' BGS. DTW = 22.71' on October 20, 2006. WS-SB-2 0-0.25' <1 Asphalt 10/19/2006 0.25'-15'<1 Red to orange fine sandy clayey SILT slightly moist, slightly plastic 0-4' HA <1 4'-34' GP <1 <1 Screen <1 manganese deposits Interval <1 20' - 40'15'-20'<1 Yellow to brown fine/medium sandy micaceous SILT, moist, loose, manganese <1 deposits, saprolite <1 20'-28'<1 Orange brown sandy SILT slightly moist, slightly plastic, manganese deposits <1 moisture at 24' <1 <1 Boring terminated at 28' BGS direct push well screen to 40' BGS. DTW = 29.16 on October 18, 2006. SOIL BORING LOGS - Welders Supply, Charlotte, Mecklenburg County, North Carolina Mo n i t o r W e l l Screen Interval 19'-34' Welder Supply boring.xls:Boring Log Page 1 of 2 1/4/2007 Boring I.D. Depth Interval (feet) VOCs (ppm)Gr a p h i c L o g Sample DescriptionMo n i t o r W e l l WS-SB-3 0-0.25'<1 Asphalt 10/19/2006 0.25'-4'<1 orange CLAY fill plastic, slightly moist 0-4' HA 4'-12'<1 orange silty CLAY, plastic, slightly moist, manganese deposits. 4'-20' GP <1 <1 Screen <1 Interval 12'-14'<1 orange brown clayey SILT moist plastic, manganese deposits. 10' - 20'14'-20'<1 Greyish brown micaceous fine sandy SILT, slightly moist and plastic; <1 Saprolite <1 Geoprobe Refusal at 20 feet BGS. Temporary well installed Gauged well on October 20, 2006 and the well was DRY. WS-SB-4 0-0.25 <1 Asphalt10/17/2006 0.25-4 <1 Red clayey sandy SILT slightly moist slightly plastic 0-4' HA 4-10 <1 Lt. Brown fine sandy SILT loose, dry, manganese deposits; 4' - 24' GP <1 saprolite at 6' <1 Screen <1 coarse/medium sand unit 1" thick at 11' bgs., becoming micaceous Interval 12-16 <1 Grey to light brown med sandy SILT, dry loose, manganese deposits 14' - 24'<1 micaceous, saprolite. 16-18 <1 grey medium sandy SILT moist to wet, loose, Boring terminated at 18' BGS direct push well screen to 24'. DTW = 22.01 on October 19, 2006. WS-SB-5 0-0.5 <1 Asphalt/Gravel 10/19/2006 0.5-5 <1 Brown fine sandy SILT 0-4' HA <1 slightly plastic moist 4'-27' GP 5-9 <1 White clayey SILT slightly stiff and plastic <1 Screen 9-14 <1 orange, red, white fine sandy SILT with a trace of clay and weathered Interval <1 manganese deposits 16.5-26.5'14-20 <1 Tan fine sandy SILT <1 <1 Boring terminated at 20' bgs direct push well screen to 26.5' bgs. DTW = 19.25 on October 23, 2006. WS-SB-6 0-1 <1 Suficial asphalt and Gravel Welder Supply boring.xls:Boring Log Page 2 of 2 1/4/2007 Appendix B Laboratory Analytical Data Sheets PRISM LABORATOR!ES,tNC. Date: 11/09/06 Company: ERM NC, PC Contact: Jennifer Gliem Address: Suite 200 8000 Corporate Center Drive Charlotte, NC 28226 #: Result outside of the QC limits. DO: Compound diluted out. E: Estimated concentration, calibration range exceeded. Client Project ID: Prism COC Group No: Collection Date(s): Lab Submittal Date(s): J: The analyte was positively identified but the value is estimated below the reporting limit. H: Estimated concentration with a high bias. L: Estimated concentration with a low bias. M: A matrix effect is present. Case Narrative (Revised) S.Blvd. G1006530 10/17/06 10/19/06 Notes: This report should not be reproduced, except in its entirety, without the writtten consent of Prism Laboratories, Inc. The results in this report relate only to the samples submitted for analysis. 449 Springbrook Road, P.O. Box 240543, Chartotte NC 28224--0403 Phone: 704/529-6364 Toll Free: 800/529-6354 Fax: 704/529-0409 This report should not be reproduced, except in its entirety, without the written consent of Prism Laboratories, Inc. 449 Springbrook Road -P.O. Box 240543 -Charlotte, NC 28224-0543 Phone: 704/529-6364 -Toll Free Number: 1-800/529-6364 -Fax: 704/525-0409 Page 2 of 8