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Ms.Lori Duncan <br /> January 19,2011 <br /> RE:2911 E.Fremont St,Stockton,CA <br /> Page 2 of 6 <br /> have been deposited by major to minor west-flowing drainages and their tributaries. In general, these <br /> sediments consist of poorly cemented, interbedded sands, silts,and clays deposited as a result of lacustrine <br /> and fluvial processes associated with the San Joaquin River system. <br /> Shallow groundwater beneath the site is expected to occur at a depth of approximately 50 to 55 feet below <br /> ground surface(bgs),with variable flow direction,based upon nearby sites listed on the State's Geotracker <br /> database. Regional groundwater flow in the area is highly influenced by large volume agricultural pumping <br /> and in the Stockton area is generally northeast,toward a large groundwater pumping depression northeast <br /> of Stockton. <br /> Previous Subsurface Investigations <br /> According to the Geotracker database,a previous occupant of the site(A&A Tool Rentals)utilized several <br /> underground fuel storage tanks(USTs),including a 550-gallon waste oil UST,a 550-gallon kerosene UST,a <br /> 2,000-gallon gasoline UST, a 2,000-gallon diesel UST, and a 3,000-gallon UST that alternately contained <br /> kerosene and gasoline. According to limited information provided by the San Joaquin County Environmental <br /> Health Department (EHD) the USTs were removed in 1992. WHF Environmental Consultants, Inc. <br /> conducted an over-excavation of the former 2,000-gallon USTs to remove impacted soil to a depth of <br /> approximately 17 feet and collected confirmation samples. The site was subsequently closed by EHD. Figure <br /> 2 shows the locations of the former USTs. <br /> Krazan & Associates, Inc. (Krazan) conducted a subsurface investigation at the site in April 2010 to <br /> investigate recognized environmental conditions identified in a Phase I Report dated April 6,2010,which <br /> was prepared by Krazan. The subsurface investigation consisted of drilling and sampling ten soil borings <br /> throughout the property, including drilling three soil borings (B 1, B2, and 133) near the inactive wash <br /> rack/drain/clarifier area in the southern portion of the building. Soil samples collected from borings B2 <br /> and B3 contained petroleum hydrocarbons at depths of 10, 15, and 20 feet bgs. No samples were <br /> collected beneath 20 feet bgs. Figure 3 presents site plan detail near the inactive clarifier,which shows <br /> the approximate locations of borings B1, B2, and B3. <br /> Additional Investigation <br /> The area investigated by L&P is near the inactive clarifier and wash drains in the southernmost %s of <br /> the building, <br /> L&P supervised the drilling and sampling of four(4)soil borings(LPB-1 through LPB-4)on October 27h <br /> and 281h,2010 under Permit No.61289,which was issued by EHD. Fisch Environmental(C57-683865) <br /> conducted the drilling utilizing a Geoprobe Model 6600 direct-push drilling rig. John Lane,a California <br /> Registered Geologist, supervised the drilling and sampling. Figure 3 presents site detail showing the <br /> locations of the soil borings. <br /> 10759-SUMMARY LTR <br />