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PUBLIC HEALTH SEWICES opa�.. <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) +Stockton,Califomia 95201 <br /> (209) 468.3400 <br /> i <br /> BRETT HUNTER lj l� <br /> CHEVRON USA PRODUCTS COMPANY <br /> P O BOX 5004 <br /> SAN RAMON CA 94583-0804 <br /> RE: 5608 NORTH PERSHING AVE SITE CODE: 1786123 <br /> STOCKTON CA <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has completed the review of your December 8, <br /> 1993 letter report requesting site closure. <br /> PHS/EHD concurs that the over-excavation activities performed in <br /> March and April of 1993 were successful in removing the bulk of <br /> the contaminated soil at the site. PHS/EHD also concurs that the <br /> actual and/or potential threat to the groundwater has been abated <br /> by this remedial action. <br /> However, PHS/EHD disagrees with the estimate of the residual <br /> hydrocarbon contamination remaining at the site. Specifically, <br /> PHS/EHD disagrees with the volume of soil assumed to be impacted <br /> by residual levels of petroleum hydrocarbons. <br /> The groundwater data indicates the groundwater in the area of <br /> monitoring well MW#8 to be impacted from low levels of <br /> hydrocarbons. In addition, low levels of xylene were detected <br /> during the installation of monitoring well MW#8 in 1990. The <br /> northeast extent of the contaminant plume, therefore, should <br /> include the area shown to be impacted from the data gathered from <br /> monitoring well MW#8 . <br /> Please provide an amended estimate of residual hydrocarbons based <br /> on an area encompassing the northeast extent of the former <br /> excavation to an area at or beyond the location of former <br /> monitoring well MW#8 • Please base the calculations on cubic <br /> areas of measurement instead of square areas of measurement. In <br /> addition, please enclose the actual calculations used to <br /> determine the estimate. <br /> Please also provide an estimate as to the approximate percent of <br /> A DWWAM of San joagWn GOUW7'Health Care Sarvk= <br />