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• MEMORANDUM• <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD • CENTRAL VALLEY REGION <br /> 3443 Routier Road, Suite A Phone: (916) 255-3000 <br /> Sacramento, California 95827-3098 CALNET: 8-494-3000 <br /> TO: Greg K. Vaughn FROM: Gail Wiggett <br /> Senior Engineer Associate Engineering Geologist <br /> Chapter 15/AST Unit - Chapter 15/AST Unit <br /> DATE: 12 May 1995 SIGNATURE: <br /> SUBJECT: REVIEW OF PILOT-TESTING WORKPLAN, PORT OF STOCKTON <br /> BULK FUEL TERMINALS , SAN JOAQUIN COUNTY <br /> I have reviewed the Pilot-Testing workplan submitted by EMCON on behalf of the Stockton <br /> Terminals Technical Committee (STTC) for pilot-scale testing of soil vapor extraction (SVE), air <br /> sparging, and ground water pumping tests at the STTC facilities in Stockton. <br /> STTC proposes simultaneous pilot-scale testing of the three remedial actions (SVE, air sparging, <br /> and ground water pumping). The proposed testing will evaluate the interim remedial techniques <br /> for reducing hydrocarbon contamination in the soils and ground water of the shallow "A-zone" <br /> underlying the terminals. <br /> The proposed testing program includes: <br /> 1. Installation of extraction, monitoring and air sparging wells. <br /> 2. Short-term tests of soil vapor extraction and air sparging <br /> 3. Ground water pumping tests. <br /> 4. Construction and evaluation of a pilot-scale ground water interceptor trench, as <br /> proposed in the October 1993 Interim Remedial Assessment Proposal (TRAP) . <br /> Bioremediation feasibility studies are not proposed at this time. <br /> Two test areas are proposed, one in the north portion of the STTC's lease area, and the other in the <br /> southern portion. Sequential tests are proposed, beginning with the first round of testing in the <br /> southern area. Testing will be performed at the northern site only if results from the southern area <br /> indicate that further testing is warranted. Each proposed remedial system(ground water <br /> extraction, SVE, and air sparging) will be tested both independently and while operating in <br /> combination with other systems. <br /> At present, testing is proposed only for the A-zone. Contamination in the deeper zones (B,C, and <br /> D) is still in an early stage of assessment, and for that reason, testing of remedial technologies in <br /> the deeper zones is not yet proposed. <br />