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• Ro zc; z !� • <br /> Advanced p � � <br /> Geo Environmental , Inc . - - <br /> 10 February 2012 <br /> AGE-NC Project No. 11-2006 RECEIVED <br /> Ms. Adrienne Ellsaesser FEB 10 2012 <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street ENVIRONMENTALPERMIT/SERICEALTFI <br /> PERMIT/SERVICES <br /> Stockton, CA 95202 <br /> Subject: Request for Regulatory Review - Subsurface Investigation Reports <br /> WARNER PROPERTY <br /> 520 North EI Dorado Street, Stockton, California <br /> Dear Ms. Ellsaesser: <br /> At the request of Dr. P. Babu Sagireddy, Advanced GeoEnvironmental, Inc. (AGE) is <br /> providing the following reports for the property located at 520 North EI Dorado Street, <br /> Stockton, California for your review: <br /> • Certified Sanborn Map Report, dated 17 October 2011 . <br /> • Phase 11 Limited Subsurface Investigation, dated 22 November 2011. <br /> • Additional Site Assessment Report- January 2012, dated 19 January 2012. <br /> All reports were prepared by AGE as part of a possible property transfer and to establish <br /> if any gross contamination is present at the site as a result of historical usage. Specifically, <br /> the 1950 Sanborn Map identified a portion of the site as occupied by gasoline service <br /> station ("gas & oils"). The gasoline station is no longer identified on the site in the 1972 <br /> Sanborn Map. Additionally, in the early part of the 1900s, the site (and surrounding <br /> properties) was occupied by a tannery. <br /> As a result of the historical usage of the property, AGE performed a limited subsurface <br /> investigation, including the advancement and sampling of several soil borings. The borings <br /> were advanced under permit from the San Joaquin County Environmental Health <br /> Department(EHD). Results of the initial investigation identified groundwater contamination <br /> near the center of the present day parking area (southern portion of the property), as <br /> evidenced in the water sample from boring 131(131-W: 3,400 ug/I using EPA Method <br /> 8015M). <br /> Additional borings, a soil vapor evaluation and a ground penetrating radar (GPR) survey <br /> of the parking area were subsequently performed (December 2011 and January 2012). <br /> 837 Shaw Road • Stockton,CA 95215 <br /> Telephone (209)467-1006 • Fax (209)467-1118 <br />