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r - <br /> dALIFORNIA REGIONAL WATER QUALITY CONTROL BOARDONG <br /> CENTRAL VALLEY REGION I`i �'� j C,�LTIf3443 Routier Road, Suite ASacramento,CA 95827-3098 " )rryya pPHONE: (916) 255-3000 �� j 'da P11 <br /> FAX:(916) 255-3015 <br /> 2 November 1993 <br /> Mr. Don McShane <br /> Westrec Properties <br /> 6400 L-aure1-Canyor­Blvd.--- <br /> North Hollywood, CA 91606 <br /> COMMENTS ON THE WORK PLAN AND REMEDL&L ACTION PLAN, TOWER PARK <br /> MARINA, SAN JOAQUIN COUNTY <br /> My comments on the 30 September, 1993 work plan/remedial action plan sumbitted by Law <br /> Crandall, Inc. are presented below. <br /> 1. Two ground water probes, G10 and G11, and four additional wells are proposed to further <br /> identify the extent of ground water contamination. I recommend that probes be used to- <br /> identify the optimum locations of the additional monitoring wells. 'If feasible, the probes also <br /> should be left in place for some time to allow evaluation of the ground water flow directions, <br /> gradient, and contaminant plume. <br /> 2. As I stated in my 28 September 1993 letter, visual classification of soils is appropriate for <br /> coarse materials, but particles equivalent to or smaller than fine sand should be analyzed <br /> using the laser particle distribution method. Since fine materials hold up the contaminants <br /> and largely dictate-the permeability of the subsurface,environment,,obtaining:an accurate <br /> characterization and location of these fines is essential to defining the extent of contamination <br /> and subsequently to remediating the site. <br /> 3. The remedial action plan considers treatment and disposal of the extracted ground water via <br /> the facility's domestic wastewater treatment plant (WWTP). The Board staff member <br /> responsible for the WWTP is Mr. Isaac Kaing. Plans to revise the WWTP's waste discharge <br /> requirements are underway. Please contact Mr. Kaing at (916) 255-3022 during your { <br /> evaluation of the W VIP's viability as a treatment and disposal option for extracted ground <br /> water. <br />