WORK PLANS - Laserfiche WebLink

Home Browse Search

rt N..d Y 1.0 INTRODUCTION SECOR International Incorporated(SECOR)has prepared this work plan for the Jackpot Food Mart at 14000 East Highway 88 in Lockeford, California (the Site, Figure 1). This work plan has been prepared at the request of Time Oil Co., the property owner. The objective of the proposed work is to install four air sparge wells to remediate petroleum hydrocarbons in groundwater at the Site. The proposed remediation of both soil and groundwater at the Site is described in a Corrective Action Plan(CAP)dated September 8, 1998. Implementation of the CAP was approved by the San Joaquin County Environmental Health Division in faxed correspondence dated September 29, 1998. 2.0 BACKGROUND The Site is located on East Highway 88 on the east side of the community of hockeford in San Joaquin County, California at an elevation of approximately 100 feet above mean sea level. The Site is currently an operating Jackpot Food Mart/Exxon gas station. The former and current Site features are shown on the Site Plan(Figure 2)- The surrounding properties are both residential and commercial real estate. An active Beacon service station is located north of the Site across Highway 88. Residential dwellings are located east and west of the Site, and a dirt road, beyond which is a vacant field, borders the southern property boundary of the Site. In September 1991 as part of a facility upgrade, three USTs were removed from the Site by Scott Company. In addition, pump islands and dispensers were removed and replaced. After removal of USTs and pump islands, soil samples were collected from the tank and pump island excavations. The highest levels of petroleum hydrocarbons were found beneath the 6,000 gallon and the 8,000 gallon USTs at 8,900 parts per million (ppm) and 6,700 ppm total petroleum hydrocarbons as gasoline (TPHg), respectively. Soil samples analyzed for total lead were below the laboratory detection limit. Approximately 150 cubic yards of soil was removed from the UST and pump island excavations. Soil samples collected from the excavated soil after it was stockpiled indicated it contained levels of petroleum hydrocarbons up to 2,700 ppm TPHg and 0.98 ppm benzene. This soil was returned to the excavation as backfill to be remediated concurrently with the rest of the Site. In September 1992, a preliminary assessment was conducted by Canonie Environmental to further evaluate subsurface conditions at the Site. This investigation involved drilling a total of nine soil borings. Three of the borings were completed as 4-inch diameter vapor extraction wells (W-1, W- 2,and W-3) and three of the borings were completed as 2-inch diameter vapor-inlet wells (W-4, W- Lwkspar,wp I SECOA Job No.7GOOS-001-02 June 7,1999 1