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Ms. Nancy Bishop - 2 - <br /> ✓ 10 October 2003 <br /> treatments under anoxic conditions, the microcosms should then be exposed to oxygen for some time <br /> period to evaluate.:if.some combination of anoxic/oxic conditions would further facilitate degradation of <br /> the ammonium and nitrate. <br /> Along with the microcosm study evaluation report, WFS should submit a revised Cleanup Plan for soil <br /> beneath the tank farm. If the HRC Primer or molasses treatment proves successful in the microcosm <br /> study, the Cleanup Plan should include a monitoring schedule for MW-3, which is immediately <br /> downgradient of the former tank farm. The monitored constituents should include amendments, <br /> breakdown products and reaction byproducts. The Cleanup Plan should also describe a soil sampling <br /> strategy, including the number of samples, sampte depths, and number of subsamples, if composite <br /> samples are to be considered. <br /> We appreciate your actions to identify a suitable treatment for ammonium in soil in advance of <br /> proposing an insitu remedy. The RAP states that the nl' icrocosm study could take three months to <br /> complete. Since the micrcosm could take longer, depending upon whether an aerobic phase is required, <br /> please submit a microcosm evaluation report by 30 January 2004,which is about four months from <br /> now. We look forward to reviewing the results. If you have any questions, you may contact me by <br /> telep one at(9 ) 255-3080 or by email at terrela@rb5s.swrcb.ca.gov. <br /> AMY TRRELL <br /> Private Sites Cleanup Unit <br /> cc: Mr. Harlin Knoll, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Fred Strauss, Western Farm Service, Vernalis <br /> Ms. Carolyn Kneiblher, GeoSyntec Consultants,Walnut Creek <br />