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PUBM: HEALTH SERVICES <br /> SAN JOAQUIN COUNTY r. Z <br /> c � <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) •Stockton, California 95201 c4�IFoaN�r <br /> (209) 468.3400 <br /> CLINT ROGERS <br /> CHEVRON USA INC <br /> P 0 BOX 5004 <br /> SAN RAMON CA 94583-0804 U APR 2 9 1992 <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 submittal entitled " Work Plan <br /> Addendum" prepared by Groundwater Technology and dated April 1, 1992. <br /> PHS/EHD comments follow. <br /> The addendum proposed three on site soil borings, two to be converted into <br /> monitoring wells and one to be converted into a vapor extraction well. A minimum <br /> of three monitoring wells are needed to determine groundwater gradient. Since <br /> only one of the existing monitoring wells contains groundwater, the installation of <br /> two additional groundwater monitoring wells will provide data necessary to <br /> calculate groundwater gradient. The installation of an additional vapor extraction <br /> well will further characterize soil contamination and aid in the site's remediation. <br /> Field work may begin after receipt of a permit application, the $89.00 fee and <br /> issuance of the drilling permit. Please notify Mary Meays, REHS, of my staff at <br /> (209) 468-0337, 48 hours prior to beginning field work. <br /> Jogi Khan M.P.H. <br /> Health r <br /> urie A. Cotulla, REHS, Program Manager <br /> Environmental Health Division <br /> LAC/MM:Ib <br /> c: Elizabeth Thayer, CVRWQCB <br /> c: Richard Blewett <br /> c: Geoffrey Bain <br /> c: John Borkovich, GTI <br /> c: Doug Oram, EA Enginering <br /> A DMmon of San Joaquin County Health fare Semcm �� <br />