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TEL No . Feb 2 ,94 14:51 No .010 P .01 <br /> • • r h WILSON,Govornar <br /> STATE Or CALIFORNIA-Errvlronmentat Protection Agency <br /> CALIFORNIA REGIONAL WATER OVALIlY CONTROL BOARD <br /> CENTRAL VALLEY REGION ►vi► <br /> 3443 RoUller Raad,Svir"A <br /> $acBm"nta. <br /> r E <br /> CA 9582%-3098 �� <br /> PHONE: (91W 255-3000 Post-It'"brand tax transmittal memo 7&75 x arPxpe• <br /> B U , 1994 <br /> FAX:(9167 255-3016 Tece. From I ca. akL. -t ENViRONMENTAE HE� t�� AIr9H4 <br /> M / <br /> Mr. Mark Geweke neel. i P n4 r <br /> P.O. Box 1210 F" rax« <br /> l ndi, CA 95241 <br /> IN-SITU BIOREMEDIATION, 16 SOUTH CHFROISFF LANE, J ODI, SAN JOAQUIN <br /> COUNTY <br /> We reviewed your proposal for a bioremediation pilot study at the (ieweke 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. 1 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 "shtg" 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 remedialion <br /> If you have any questions, call me at (916) 255-3133. <br /> LLLFI'11ZA Tin A. 'rilAYER <br /> Assoct Engineer <br /> cc: Mr. Harlin Knoll, San Joaquin County Environmental lleolth Services, Stockton <br /> Mr. Jim DeMera, Mullen, Sullivan & Newton, Lodi <br /> Mr. Bob Marty, Geological Audit Services, Stockton <br />