ARCHIVED REPORTS_XR0007769 CASE 2

Home Browse Search

' KLEIN FELDER File No 20-1008-52 A03 . July 6, 1994 1 I3 BACKGROUND The site is located at 444 South Wilson Way in Stockton, California Two underground ' diesel storage tanks and the associated dispensers were excavated and removed from the site on November 5, 1993 Analysis of a soil sample obtained from 3 feet beneath the former dispenser location revealed concentrations of 0 01 mg/kg ethylbenzene, 0 011 mg/kg toluene, 0 075 mg/kg total xylenes, and 3,200 mg/kg Total Petroleum Hydrocarbons as referenced to Diesel (TPH-D) ' In a March 3, 1994 letter, Mr Doug Wilson of the San Joaquin County Environmental Health Division (SJCEHD) indicated that the County will not recommend "final closure without further investigation to determine the full extent of the soil and/or groundwater ' problem " Currently, groundwater is approximately 70 to 80 feet below the ground surface, as indicated on the Fall 1993 Groundwater Depth Map published by the San Joaquin County Flood Control and Water Conservation District At the req , uest of the SJCEHD additional soil was removed from beneath the former dispenser on April 26, 1994 At that time a soil sample was obtained from the bottom at a Idepth of approximately 10 feet below ground surface (bgs) Chemical analysis of the sample obtained, revealed a concentration of 15,000 mg/kg Total Petroleum Hydrocarbons as diesel rBased on the concentrations of Total Petroleum Hydrocarbons as diesel (TPH-D) in the soil at a depth of 10 feet, further assessment was necessary to determine the full extent of diesel- affected soil Klemfelder was contracted by San Joaquin County Public Works Department Solid Waste Division to attempt to further define the diesel-affected soil beneath the former dispenser location Those services were to be addressed in this assessment of diesel in soil This report presents the results of Kleinfelder's Assessment of Diesel in Soil of the former Diesel Dispenser Area 1 Copyright 1994 Kleinfelder Inc Page 6 of 11