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PUBLIC HEALTH SERVICES OP�UN C <br /> SAS (OAQUIN COUNTY r: <br /> JOGI KHANNA M.D.NIT H <br /> Health Officer <br /> c P <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 4 i F 6 R <br /> (209) 468-3400 <br /> CLINT ROGERS cc, PAY <br /> i <br /> CHEVRON USA <br /> P O BOX 5004 .JUL 0 71992 <br /> SAN RAMON CA 94583-0804 <br /> Re: Chevron Station #9-6171 SITE CODE: 1784 <br /> 6633 Pacific Ave. <br /> Stockton, CA 95207 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has completed review of the recently submitted "First Quarter 1992 Monitoring Report" <br /> dated March 31, 1992 and prepared by Sierra Environmental Services. PHS/EHD has <br /> also reviewed historic documents pertaining to this site and has the following comments <br /> for your consideration. <br /> PHS/EHD requested in correspondence dated July 26, 1991 that a downgradient well be <br /> installed to continue the groundwater investigation necessary to define the plume of <br /> groundwater contamination. <br /> A work plan was submitted for the installation of a downgradient well and the <br /> destruction of monitoring well, MW1, which has gone dry due to local drought conditions. <br /> PHS/EHD permits #91-3153 and #91-3154 were issued December 13, 1991 for the <br /> proposed field activities. <br /> To date field activities have not commenced. In order to proceed with the investigation <br /> necessary to determine the boundaries of groundwater contamination, please plan to <br /> schedule field work for the installation of a downgradient well by August 10, 1992. <br /> Residual soil contamination, associated with former underground storage tanks #1, #2, <br /> and #3 removed December 1986, remains as a source of contamination to groundwater. <br /> Once groundwater contamination is defined, a problem assessment report should be <br /> prepared exploring remedial alternatives. <br /> A Division of Vn Joaquin county Health tare services �� <br />