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San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> Environmental Health Department F' ASSISTANT DIRECTOR <br /> 600 East Main Street Laure Cotulla,REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> 11SSI1 � Cad Borgman, REHS <br /> Mike Huggins, REHS,RDI <br /> Website: www.sjgov.org/ehd Margaret Lagorio, REHS <br /> i'9 6 Phone: (209)468-3420 Robert McClellon,REHS <br /> Fax: (209) 464-0138 Jeff Carruesco,REHS,RDI <br /> Kasey Foley, REHS <br /> 30 April 2008 <br /> Mr. George Teranishi and Ms. Mei Teranishi <br /> 1600 Durham Ferry Road <br /> Tracy CA 95376 <br /> Subject: Former Georges Service <br /> 1600 Durham Ferry Road <br /> Tracy CA 95376 <br /> San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Remedial Action Plan, Soil Vapor Extraction and Oxygen Releasing <br /> Compound (RAP), dated September 26, 2007, Re: Remedial Action Plan, Soil <br /> Vapor Extraction and Oxygen Releasing Compound (Memo 1), dated <br /> February 05, 2008, as modified by Re: Remedial Action Plan, Soil Vapor <br /> Extraction and Oxygen Releasing Compound (Memo 2), dated February 25, <br /> 2008, as further modified by Re: Remedial Action Plan, Soil Vapor Extraction and <br /> Oxygen Releasing Compound (Memo 3), dated March 19, 2008, all prepared on <br /> your behalf by your consultant Geological Technics, Inc. (GTI). The RAP and <br /> Memos 1 and 2 were modified in response to the EHD comment letter dated <br /> 16 January 2008 and telephone conversations between the EHD and GTI on <br /> 12 February 2008 and 18 March 2008. <br /> The EHD approves the following scope of work as proposed in the various GTI <br /> documents cited above: <br /> • Installation of monitoring wells MW-11 and MW-12 as proposed in Memo <br /> 3 to monitor the effects of air sparging. <br /> • Completion of the two-week soil vapor extraction (SVE) test as proposed <br /> in Memo 2. <br /> • Installation of up to 15 insitu air sparging (IAS) wells onsite and conduct <br /> the IAS pilot test at the 'bio-mode' low flow rate as proposed in Memo 2 <br /> and Memo 3. <br /> The EHD requires additional information before approving installation of the <br /> proposed 48 ORC-injection point borings, injection of the ORC-Advanced and <br /> installation of monitoring wells MW-9 and MW-10, which were proposed to <br /> monitor the effects of the ORC-Advanced application(s). The Central Valley <br /> Regional Water Quality Control Board (CVRWQCB) must determine whether or <br /> not it will be necessary to write Waste Discharge Requirements (WDRs) for <br /> WP Comment Letter 0408.doc <br />