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MATE OF CALIFORNIA- Environmental Prot.. Agency • PETE WILSON, Governor <br /> CALIFQ.r11A REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION IVI)�'i ,,,z.N'1 AI_ HEALTH <br /> ' <br /> 3443 Routier Road, Suite A .i�'RVICE;' <br /> Sacramento, CA 95827-3098 [-p <br /> PHONE: (916) 255-3000 9,¢ I[-FB —7 PM 2: 53 <br /> FAX: (916) 255-3015 J <br /> Mr. Mark Geweke 2 February 1994 <br /> P.O. Box 1210 <br /> Lodi, CA 95241 <br /> IN-SITU BIOREMEDIATION, 16 SOUTH CHEROKEE LANE, LODI, SAN JOAQUIN <br /> COUNTY <br /> We reviewed your proposal for a bioremediation pilot study at the Geweke site. We do not object <br /> to initiation of the pilot study, however, we have the following comments: <br /> 1. No bentonite will be placed in any ground water monitoring wells. <br /> 2. We remain unsure about the mechanism whereby the bacterial inoculum will move into upper <br /> geological strata, particularly if the packers are placed at depths of 40 feet. <br /> a. Depth of placement of the packers was not specified <br /> b. Volume of inoculum per well or per inoculation was not specified <br /> 3. The monitoring program remains incomplete but we will be working on it the remainder of <br /> the week. <br /> 4. I have enclosed copies of our reference regarding P. aeruginosa. <br /> 5. Between our meeting of 28 January and today, Board staff did not mention concerns about <br /> "bacterial sludge". We did refer to a "slug" of bacteria migrating through soil or ground <br /> water. One purpose of this pilot study is to determine how the bacteria will move through <br /> the soil. Our intention is that no impact to ground water will occur at during this study. If <br /> you anticipate that bacterial "sludge" will reach ground water during this study as proposed, <br /> you must modify your proposal. <br /> 6. Background data on native and indigenous bacteria, soil characteristics, aquifer <br /> characteristics, computer modeling, bench scale tests, and pilot tests should have been <br /> collected prior to November 1993. Some of this data may be collected during the pilot test <br /> and prior to initiation of full-blown remediation <br /> If you have any questions, call me at (916) 255-3133. <br /> OLIZ, ETH A. THAYER <br /> Associ a Engineer <br /> cc: Mr. Harlin Knoll, San Joaquin County Environmental Health Services, Stockton <br /> Mr. Jim DeMera, Mullen, Sullivan & Newton, Lodi <br /> Mr. Bob Marty, Geological Audit Services, Stockton <br />