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PUBLIC HEALTH SERV ICES <br /> SAN JOAQUIN COUNTY a <br /> ENVIRONMENTAL HEALTH DIVISION H: • N <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 9 ' <br /> 209/468-3420 Co �. <br /> BRETT HUNTER MAILED FEB 2 91996 <br /> CHEVRON USA INC <br /> P O BOX 5004 <br /> SAN RAMON CA 94583-0804 <br /> RE: Chevron Service Station #9-1918 SITE CODE: 1138 <br /> 45 East Harding Way <br /> Stockton CA 95204 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has completed review of the "Proposed Remedial Action Plan" dated <br /> December 27, 1995 which was prepared by Pacific Environmental Group. PHS/EHD <br /> has also reviewed the most recent quarterly report dated November 29, 1995 and <br /> prepared by Blaine Tech and has the following comments for your consideration. <br /> The remedial action plan (RAP) proposed to complete plume delineation with off site <br /> source search; to initiate soil vapor extraction/bioventing with air sparging; and <br /> remediation system's monitoring and sampling. The RAP included the installation of <br /> three soil vapor extraction (SVE) wells and two air sparge wells. <br /> PHS/EHD recognizes that SVE wells, VW1 - VW3, are anticipated to be more <br /> efficiently designed as compared to the already installed SVE wells. As discussed at <br /> the December 7, 1995 meeting, evaluation regarding existing wells' necessity should <br /> be initiated and a destruction plan submitted. <br /> As both air sparge and SVE will influence the biological degradation of fuel <br /> hydrocarbons; baseline measurements should be collected prior to implementation of <br /> the proposed system and periodically hence forth to assess the effectiveness of <br /> biological activity to decrease the concentrations of fuel hydrocarbons rather than <br /> "upon conclusion of SVE" as indicated in the RAP. <br /> According to the most recently available quarterly report, monitoring well MW9 which <br /> is located in the area of the former tanks is screened 10 feet below first water. <br /> Despite the well's construction, total petroleum hydrocarbon as gasoline and benzene <br /> were detected. <br /> A Division of San Joaquin County Health Care Services <br />