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t � <br /> HE EARNER OMPAN <br /> SCRAP <br /> }, METALS <br /> 2711 NAVY.DRIVE STOCKTON, CA 95206 <br /> (209)948.3498 <br /> Aril <br /> p 9, 2001 <br /> t Harlin Knoll, Senior REHS, <br /> LOP/Site Mitigation Unit IV <br /> Environmental Health Division <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California, 95202 <br /> r Subject: 2711 Navy Drive,Local Oversight Program Site Code: 1 <br /> �, g 204 <br /> f { t Limited Soil and Groundwater Sampling Report <br /> �J Dear Mr. Knoll: <br /> k Attached is the document entitled Limited Soil and Groundwater Sampling Report, <br /> prepared for The Learner Company by Kleinfelder, Inc., and dated January 12, 2001. <br /> During this phase of site activities, soil and groundwater samples were collected from <br /> within, and adjacent to, the former underground storage tank excavation. Review of this <br /> t document yields the following conclusions: <br />�` • Approximately 93 cubic yards of impacted soil that was excavated during the tank <br /> E removal process was characterized on December 19, 1996 and, with approval from <br /> the EHD, was used to backfill the excavation. The characterization samples indicated <br /> diesel range hydrocarbons ranging to 5,400 mg/kg, gasoline ranging to 100 mg/kg, <br /> ethylbenzene ranging to 1.5 mg/kg, and xylenes ranging to 7.1 mg/kg. Between <br /> December 19, 1996 and March 5, 1997, the soil was mixed several times in an effort k <br /> to enhance biodegradation of the hydrocarbons (Underground Storage Tank Site # <br /> Investigation Workplan—Clayton, <br /> June 1997). <br /> . <br /> During the recent site investigation, soil samples were collected within the horizon <br /> containing this soil (2' to 5.5' below ground surface (bgs)) at boreholes GP-1, GP-2 <br /> and GP-9. The analytical results for these samples indicated diesel range <br /> hydrocarbons ranging to a maximum of 39 mg/kg, and no detectable gasoline range <br /> t hydrocarbons, ethylbenzene or xylenes. These results indicate that biodegradation <br /> G <br /> has been effective and that limited concentrations of hydrocarbons remain. <br /> E • The recent site investigation detected moderate to elevated diesel range hydrocarbons <br /> j <br /> in two soil samples, each collected from within the boundaries of the former <br />` <br /> DAmer-EHDAHS44M1 doe <br /> r <br />