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0�Clayloff 30 SITE BACKGROUND The site is an active scrap metal recycling facility Two underground storage tanks (UST) have been removed from the site The tanks were a 10,000-gallon diesel UST and a 4,000-gallon gasoline UST Limited impact to the groundwater was identified ' following tank removal operations 31 SITE PHYSICAL DESCRIPTION The Learner Company site is located at 2711 Navy Drive, in Stockton, California The local area is industrial in nature, with a number of large bulk fuel tank farms located close to the property The site is located within one-quarter mile of the San Joaquin River and the Port of Stockton Deep Water Channel 32 SITE HISTORY The UST Removal Report indicated that soil contained up to 4,300 mg/kg diesel fuel, with no gasoline, low benzene (maximum of 0 6 mg/kg), and total lead up to 35 mg/kg Groundwater samples from the tank excavation contained diesel at concentrations up to 4,300 ug/l, and MTBE at concentrations up to 3,200 ug/l The Learner Company rcontracted Kleinfelder to conduct a site investigation in October 2000 to evaluate impacts to the soil and groundwater outside of the excavation Kleinfelder presented the results of their investigation in the document entitled Limited Soil and Groundwater Sampling Report (Kleinfelder, January 12, 2001) The site investigation indicated that BTEX was not detected in groundwater samples collected outside the bounds of the former tank ' excavation The benzene concentrations in the groundwater beneath the former UST location show a marked decrease from those reported at the time of the tank removal Current benzene concentrations range to 8 6 ug/l, whereas, at the time of the tank removal, benzene was reported at 80 ug/l MTBE concentrations also show a significant decrease from the 3,200 ug/l reported at the ' time of the tank removal to a maximum of 36 ug/l during the Kleinfelder sampling The bulk of the MTBE concentrations is present within the tank excavation and immediate vicinity and do not appear to be migrating significantly The San Joaquin County Public Health Services, Environmental Health Division (PHD/EHD) reviewed the Kleinfelder report and subsequent transmittals from The Learner Company and requested that a limited groundwater investigation be conducted This investigation was to include installing three groundwater monitoring wells on the periphery of the zone of impact to determine if significant migration of fuel related compounds is occurring I r A_3 ' %\LOSA_NWOIUMTA\Et iWrojTC22671Hcalth&Safcty Plan doc