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10MEMORANDUM • <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD • CENTRAL VALLEY REGION <br /> 3443 Routier Road, Suite A Phone: (916) 255-3000 <br /> Sacramento, CA 95827-3098 CALNET: 8-494-3000 <br /> TO: Gordon L. Boggs FROM: Elizabeth A. Thayer <br /> UGT Program Coordinator Associate Engineer <br /> DATE: 9 December 1993 SIGNATURE: <br /> SUBJECT: GEWEKE SITE, 16 SOUTH CHEROKEE LANE, LODI, SAN JOAQUIN COUNTY <br /> Geweke's consultants, Geological Audit, have proposed in-situ bioremediation of soil and ground <br /> water. After reviewing Geweke's reports and researching the subject, I have prepared two memos <br /> about bioremediation: one containing a condensation of the information I gathered in my research <br /> and the other provides a framework which Board staff may use to respond to proposals for in-situ <br /> bioremediation. Copies of both memos are attached. <br /> We received the FRP, dated 30 July 1993. In my letter, dated 21 September 1993, I responded to <br /> the FRP and requested that additional information be submitted. Geweke submitted additional <br /> information on 8 October 1993. Based on my review of the new submittal and my research of the <br /> bioremediation process, Geweke has not submitted the following information requested or necessary <br /> for bioremediation: <br /> 1. They have not stated what cleanup levels are expected and how these levels compare to levels <br /> required to maintain the beneficial uses of the water. <br /> 2. They stated that no additional steps must be taken to remediate the "smear zone". However, <br /> they did not provide substantiating data. They did not explain how bioremediation will be <br /> efficient in this zone with low moisture content. <br /> 3. Data on the pH, EC, metals, nitrogen, phosphorus, and other micronutrient content in the soil <br /> have not been submitted. <br /> 4. Data on the soil characteristics; particle size distribution, porosity, permeability, moisture <br /> content, organic matter content, oxygen content, etc. have not been submitted. <br /> 5. Results of vapor extraction tests and aquifer tests have not been submitted. <br /> 6. Background CO2 and OZ concentrations in soil vapor have not been tested. <br />