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V 0 -, 1�� <br /> PUBLIC HEALTH SERYICES �"o <br /> G <br /> SAN JOAQUIN COUNTY r' � <br /> OGI KHANNA b9.D..1\[P.H. <br /> Health Officer • �4. <br /> P.O. Box 2009 0 (1601 East Hazelton Avenue) • Stockton, California 95201 �iFog <br /> (209) 466-3400 <br /> JIM ESCOBAR <br /> CITY OF STOCKTON ) �� <br /> PUBLIC WORKS DEPARTMENT <br /> 425 N EL DORADO STREET MAR 10 1992 <br /> STOCKTON CA 95202 <br /> RE: COS - Fire Station #6 SrM CODE: 1013 <br /> 1501 Picardy Drive <br /> The Public Health Services, Environmental Health Division has completed the site evaluation of the <br /> above referenced facility. <br /> The August 23, 1991 report"Problem Assessment Report for Soil and Groundwater Contamination" as <br /> prepared by Resna Industries recommends no further action based upon the relatively small volume of <br /> diesel affected soils remaining in place combined with low permeable soils which were characterized <br /> during the field activities. <br /> Unfortunately, the diesel affected soils are highly saturated at a depth of 13.5-14 feet (8,000-11,000 ppm <br /> TPH-D). Seasonal high groundwater elevations have fluctuated at depths between 20-30 feet <br /> (1983, 1986; San Joaquin County Flood Control). The hydrocarbon contamination remaining at 13.5-14 <br /> feet exceeds acceptable concentration (100 ppm TPH-D) which may remain in place with no remedial <br /> action necessary. <br /> In order to adequately determine the actual threat to groundwater versus the potential threat, the lateral <br /> and vertical extent of the soil contamination is essential. Once the extent is knownyan alternative for <br /> remediation can be selected. The basis for selection of an appropriate remedial investigation/feasibility <br /> study should utilize the following criteria for reasonale: <br /> 1. threat of contamination to groundwater <br /> 2. benefical uses which may be affected <br /> 3. carcinogenicity of pollutant <br /> 4. human health and safety risk <br /> Any remedial actions and/or cleanup options may include the following or other actions, in any <br /> combination: <br /> 1. excavation, source removal <br /> 2. leave in place <br /> 3. enhanced biodegadation <br /> 4. soil venting <br /> 5. groundwater monitoring <br /> A Division of San Joaquin County Health Care Services <br />