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PUBLIC EALTH SERVfCES <br /> SAN JOAQUIN COUNTY ?� <br /> ENVIRONMENTAL HEALTH DIVISION " <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer c�... <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> TREVOR SANTOCHI COPY <br /> CRC ENVIRONMENTAL <br /> 17875 VON KARMAN SUITE 200 <br /> IRVINE CA 92714 <br /> C' _ �� ' <br /> RE: 1235 EAST ALPINE SITE CODE: 1512 <br /> STOCKTON CA <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has completed the review of the "Summary of Investigation Findings and <br /> Closure Report" dated September 30, 1994, submitted by SEACOR, and has the <br /> following comments for your consideration. <br /> The closure report must summarize the site activities from the very beginning of the <br /> investigation. The emphasis of the summary must be on the physical data found <br /> during the investigation. The format of the report should lead the reader to <br /> understand why the physical data being presented in the report justifies a closure <br /> recommendation. <br /> The report must include comprehensive tables showing all physical data generated at <br /> the site from the start of the investigation to the present. This includes data from the <br /> monitoring wells (soil and groundwater), soil borings, excavation confirmation <br /> samples, and depth to water and groundwater elevation measurements. <br /> A mass balance determination must be made of the soil contamination found in the <br /> former leach pit area. A determination should be calculated for every constituent <br /> determined to be present. Based on the results of this determination, the <br /> contamination may need to be modeled to provide an indication of any possible <br /> impact to groundwater in the future. In addition to the soil lithology, all soil sample <br /> results generated from this area should be depicted in the cross section as well. <br /> The seasonal high depth to water for this site is approximately 40 feet below ground <br /> surface (San Joaquin County Flood Control Map, Spring 1986). Any modelling <br /> utilized for the site should take this depth to water level into consideration. In <br /> addition, this groundwater level recorded for the site area in 1986 should be <br /> evaluated for its possible influence on the distribution of contaminants currently found <br /> A i)i.iNion of San.10atlUin Count} Health Care Service, <br />