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V FNVIF ONVIENTAL HEALTH KLEINFELDER PFR�4'1-- SERVICE 96 OCT 21 AH I I: 10 October 17, 1996 File 23-482276-B00 Mr Joel Weiss California Regional Water Quality Control Board 3443 Routier Road Suite A Sacramento, California 95827-3098 Subject: Soil Excavation Assessment Report Independent Trucking Company Site 1145 West Charter Way Stockton, California Dear Mr Weiss Attached is the Soil Excavation Assessment Report for the Independent Trucking Company facility in Stockton Independent Trucking Company has accepted responsibility to remediate petroleum hydrocarbon contaminated soil associated with a May 1995 diesel fuel release On August 21, 22 and 23, Independent Trucking Company excavated an additional 900 cubic yards of petroleum impacted soil to a maximum depth of 21 feet It appears that Independent Trucking Company has removed . the bulk, if not all, of the fuel released in May 1995 This conclusion is based on the following information • Independent Trucking Company excavated 500 cubic yards of impacted soil initially after the release occurred Confirmation samples were collected from the initial excavation with no detectable petroleum hydrocarbon concentrations • Kleinfelder drilled and sampled six soil borings that indicated that the extent of migration was limited to less than a depth of 10 feet with the exception of one boring which had petroleum hydrocarbons detected at 10 feet, but not at 15 feet • An additional 900 cubic yards of soil were excavated to a depth of 21 feet • Forensic hydrocarbon analysis of a sample from the bottom of the second excavation (21 feet) indicates that two materials are present in the soil One is a weathered diesel #1/kerosene which appears to be older that 10 years based on weathering patterns The second is a diesel #2/home heating oil that appears to have been released within the last five years • TPH purgeable was detected in all three samples analyzed up to 630 mg/kg This would indicate a petroleum hydrocarbon such as gasoline which was not stored in the aboveground storage tanks • Other sources of petroleum hydrocarbons and known releases are present in the vicinity of the site Three underground diesel storage tanks and a waste oil storage tank were removed from the site in December 1994 Soil borings and eight groundwater monitoring wells have been installed and sampled to assess these underground fuel storage tanks and petroleum hydrocarbon contamination has been 23-482276-BOO/CR96S276 Page i of n October 17, 1996 Copyright 1996 Kleinfelder, Inc KLEINFFLDER 3077 Fite Circle, Sacramento, CA 95827 (916) 366-1701