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mg/kg). Ethylene Dibromide concentrations in soil samples submitted were reported to be below analytical method detection limits. Total lead content for the soil samples was reported to range from non-detection to a maximum of 8 mg/kg. Significant soil petroleum hydrocarbon contamination was reportedly present under the former 10,000 gallon UST (Figure 5) (Applied GeoSystems, 1988). Apparently RAMCON conducted a limited over-excavation of the petroleum hydrocarbon contaminated soil and stockpiled the soil on site during February 1988. Although definitive documentation is lacking it is believed that approximately 50 to 150 cubic yards of soil were removed from the former UST location during this time period. During this 1988 exploratory excavation effort six soil samples were reportedly collected by RAMCON from the floor of the excavation and analyzed for TPH. These soil samples were reportedly collected from a depth of 18 feet below ground surface (bgs). These samples were submitted to an analytical laboratory for analysis and were reported to contain up to 1,300 mg/kg TPH. Additional exploratory excavation advanced the floor of the excavation to a depth of about 27 feet below ground surface (bgs). Soil samples were reportedly collected from the floor of the excavation at 27 feet bgs and submitted to a state certified analytical laboratory. The samples were reported to contain petroleum hydrocarbon contaminants at concentrations below analytical method detection limits (Applied GeoSystems. 1988). No laboratory analytical report or map of the soil sample locations are available. The 1988 excavation was reportedly backfilled with clean soil to grade (Dana Booth,verbal communication, 2003). No written documentation regarding backfill of the excavation has been found in the PHSEHD records available. We understand from statements from PHSEHD staff providing oversight of the site during 1988 that a significant volume of concrete associated with 1 Numerous attempts th e USTs was also laced back into the former UST pit as backfill material. p p to drill through the former UST pit have been attempted but concrete material has prevented soil borings to be advanced more than several feet deep. The approximate 50 to 150 cubic yards of petroleum hydrocarbon contaminated soil was mediated on the weste rn end of theproperty. 8 and More reportedly stockpiled on site Burin 198 i� p Y p g Based on the soil sampling and laboratory analytical results during the UST removal,PHSEHD issued an Unauthorized Release Report(UAR) and directed the property owner, Mr. Carl Yearing to conduct a site assessment investigation to determine the vertical and horizontal extent of gasoline and other volatile organic compounds released into the soil and groundwater beneath the site. Litigation apparently occurred from 1988 to 1991 between RAMCON and Yearing over the responsibility of who should conduct and pay for the PHSEHD-directed investigation and remediation costs. RAMCON retained Applied GeoSystems. Inc.to investigate soil and groundwater contamination at the site during August, 1988. In August 1988. Applied GeoSystems drilled four borings (PT-SB 1 to PT-SB4, Figure 6). After drilling PT-SB4, Applied GeoSystems converted Parmar\Site Assessment Workplan\02152018.wpd 3