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04/18/2002 16:43 209467 AGE STOCKTON 0 PAGE 02/02 <br /> Advanced <br /> GeoEnvironmental, Inc. <br /> 18 April 2002 <br /> AGE-NC Project No. 9570144 <br /> Ms. Lisa Middleton <br /> San Joaquin Valley Air Pollution Control District <br /> 4230 Kiernan Avenue <br /> Modesto, California 95256 <br /> Subject: Soil Vapor Extraction System Modification <br /> Former CHASE CHEVROLET Facilities <br /> 424 North Van Buren Street,Stockton,California <br /> Dear Ms. Middleton: <br /> As,part of ongoing remediation at the former Chase Chevrolet facility located at 424 North Van Buren <br /> Street, Stockton, California,Advanced GeoEnviromnental, Inc. (AGE)proposes to continue to extract, <br /> hydrocarbons utilizing an active vacuum blower and two carbon canisters (400 pounds each). This <br /> modification of the soil vapor extraction (SVE) system will continue to allow for the recovery and <br /> destruction of hydrocarbon vapors from the vadose zone. The anticipated duration of the remediation at <br /> the site will last approximately six months.Monitoring and sampling of the SVE influent and effluent will <br /> be performed monthly;analytical results ofvapor samples willbe included in quarterly monitoring reports, <br /> The SVP system was operated between 12 and 18 March 2002 for collection of vapor samples to <br /> determine emission levels. Based on the analytical results ofvapot samples collected during March 2002, <br /> operation of the SVE system would produce approximately 4 pounds per day ofvolatilized hydrocarbons. <br /> In accordance with San Joaquin County Aa Pollution Control District regulations,AGE proposes utilizing, <br /> activated carbon to reduce hydrocarbon emissions to non-detect levels. <br /> Enclosed is an Authority to Construct permit application, analytical results of soil gas samples from the <br /> influent stream, calculations used to determine the hydrocarbon emission rate,a location m;ip and a site <br /> reap illustrating the proposed SVP system. <br /> If you have any questions or comments,please contact the undersigned at(209)467-1006. <br /> Sincerely, <br /> Advanced GeoEnvironmental,Inc_ <br /> Paul B. Dotson <br /> Staff Geologist <br /> cc: Kitty Walker, City of Stockton Housing and Redevelopment Department <br /> Jeffrey Wong, San,Joaquin County Prlvironmental Health Department <br /> 837 Shaw Road,Stockton.California 95215 <br /> Telephone(209)467-1006 FAX(209)467-1118 <br />