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090 LEVINE•FRICKE <br /> ENGINEERS,HYDROGEOLOGISTS &APPLIED SCIENTISTS <br /> December 3, 1992 IF 2617 <br /> Mr. Eric Garcia <br /> Hazardous Materials Specialist <br /> Department of Toxic Substances Control <br /> 10151 Croydon Way, Suite 3 <br /> Sacramento, California 95827-2106 <br /> Subject: Department of Toxic Substances Control Comments <br /> Regarding the Work Plan for an Additional Soil and <br /> Ground-Water Investigation at the Former Great <br /> Western Chemical Company Facility, 824 South Center <br /> Street, Stockton, California <br /> Dear Mr. Garcia: <br /> This letter provides responses to the Department of Toxic <br /> Substances Control (DTSC) comments regarding the October 30, <br /> 1992 work plan for an additional soil and ground-water <br /> investigation at the Former Great Western Chemical Company <br /> Facility, 824 South Center Street, Stockton, California. <br /> General Comments <br /> Future submittals will have the seal and license number of a <br /> State of California Professional Engineer, Registered <br /> Geologist, or Certified Engineering Geologist. Mr. Mark Knox, <br /> who signed the Work Plan, is a State of California <br /> Professional Engineer. <br /> Soil Sampling <br /> DTSC Comment 1: Levine-Fricke will drill two additional <br /> borings to collect soil samples on a continuous basis in the <br /> vicinity of former boring ED-3 and in the former ultra etch <br /> storage area. The purpose of these borings will be to provide <br /> soil samples to determine the lithology of the sediments at <br /> the site and to determine the specific sample intervals to be <br /> submitted for chemical analyses. If the lithology of the <br /> sediments changes to or from coarse- or fine-grained materials <br /> in sequences two or more feet thick in the upper 10 feet of <br /> soil, Levine-Fricke will submit soil samples collected from <br /> the top or bottom of the fine-grained sediments for chemical <br /> analysis. If the lithology does not change, samples will be <br /> submitted for chemical analysis based on photoionization <br /> detector (PID) readings. <br /> 2617\2617CHTS:wtk <br />