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�ClatW(�ri <br /> GROLIP Sr ERVICES <br /> 2.0 DESCRIPTION OF WORK TO BE PERFORMED <br /> ' Task 1) Install three groundwater monitoring wells <br />' Task 2) Quarterly groundwater sampling <br /> Task 3) Abandon three groundwater monitoring wells <br /> r <br /> 3.0 SITE BACKGROUND <br /> The site is an active scrap metal recycling facility Two underground storage tanks (UST)have <br /> been removed from the site The tanks were a 10,000-gallon diesel UST and a 4,000-gallon <br /> gasoline UST Limited impact to the groundwater was identified following tank removal <br /> operations <br /> 3.1 Site Physical Description <br /> The Learner Company site is located at 2711 Navy Street, in Stockton, California The local area <br /> is industrial in nature, with a number of large bulk fuel tank farms located close to the property <br /> The site is located within one-quarter mile of the San Joaquin River and the Port of Stockton <br /> Deep Water Channel <br /> 3.2 Site History <br /> The UST Removal Report indicated that soil contained up to 4,300 mg/kg diesel fuel, with no <br /> gasoline, low benzene (maximum of 0 6 mg/kg), and total lead up to 35 mg/kg Groundwater <br />' samples contained diesel at concentrations up to 4,300 ug/l, and MTBE at concentrations up to <br /> 3,200 ug/1 The Learner Company contracted Kleinfelder to conduct a site investigation in <br /> October 2000 Kleinfelder presented the results of their investigation in the document entitled <br />' Limited Soil and Groundwater Sampling Report (Klemfelder, January 12, 2001) The site <br /> investigation indicated that BTEX was not detected in groundwater samples collected outside the <br /> bounds of the former tank excavation The benzene concentrations in the groundwater beneath <br /> the former UST location show a marked decrease from those reported at the time of the tank <br /> removal Current benzene concentrations range to 8 6 ug/l, whereas, at the time of the tank <br /> removal, benzene was reported at 80 ug/1 <br />' MTBE concentrations also show a significant decrease from the 3,200 ug/l reported at the time of <br /> S`n � P <br /> the tank removal to a maximum of 36 ug/1 during the Klemfelder sampling The bulk of the <br /> MTBE concentrations are present within the tank excavation and immediate vicinity and also do <br /> not appear to be migrating significantly <br /> The San Joaquin County Public Health Services, Environmental Health Division (PHD/EHD) <br /> reviewed the Kleinfelder report and subsequent transmittals from The Learner Company and <br />' S Troj\P02263\2263 hsp_Oct 02 doc A-3 <br />