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f� <br /> kn KLEINFELDER <br /> • Other sources of petroleum hydrocarbons and known releases are present in the <br /> vicinity of the site Three underground diesel storage tanks and a waste oil <br /> storage tank were removed from the site in December 1994 Soil borings and <br /> eight groundwater monitoring wells have been installed and sampled to assess <br /> these underground fuel storage tanks and petroleum hydrocarbon contamination <br /> has been detected Underground fuel storage tanks were also removed from an <br /> adjacent property <br /> • Although groundwater was not encountered in the excavation, in past years it has <br /> fluctuated and is thought to have been present between 15 and 20 feet below the <br /> ground surface Groundwater monitoring wells are present in the area and have <br /> documented groundwater contamination from other sources Petroleum <br /> hydrocarbons from other sources may have been introduced by shallow <br /> groundwater conditions in the past ` <br /> Independent Trucking Company has assessed the May 1995 fuel release and excavated impacted <br /> soil At this point it appears that soil contamination remaining in the excavation is not related to <br /> the May 1995 release <br /> Kleinfelder recommends that a copy of this report be submitted to the Regional Water Quality <br /> Control Board and the San Joaquin County Public Health Service for review As the rainy <br /> season is approaching, Kleinfelder recommends that the excavation be backfilled and closed <br /> li <br /> 23-482276-BOO/CR96S276 Page 9 of I 1 October 17, 1996 <br /> Copyright 1996 Kleinfelder,Inc <br />