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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA MD.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 (1601 East Hxwkoa Av=W) •Soociam Cdffi mia 95201 <br /> (209)468-3400 F-:- <br /> �' u <br /> BRETT HUNTER <br /> CHEVRON USA <br /> P O BOX 5004 NOV 2 4 199? <br /> SAN RAMON CA 94583--0804 <br /> RE: PETRIG SEED SITE CODE: 9266 <br /> FORMER SIGNAL OIL 1221-5 <br /> 5431 GRANT LINE ROAD <br /> BANTA, CA <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has reviewed the "Work Plan For Soil and <br /> Groundwater Assessment" dated October 25, 1993, prepared by <br /> Groundwater Technology, Inc. (GTI) , for the above referenced site. <br /> As discussed in a telephone conversation between Margaret Lagorio <br /> of PHS/EHD and yourself on November 22, 1993, we will require the <br /> installation of permanent monitoring wells to confirm gradient and <br /> be able to obtain repeatable, confirmatory water sample results. <br /> The information obtained from the temporary monitoring wells will <br /> be used to decide the placement of permanent monitoring wells. <br /> Depth to water in this area of the county is about 10 feet below <br /> grade. After installation of screened casing 5 feet above water <br /> level and sand pack 2 feet above the screened interval there will <br /> only be about 3 feet of open bore hole. Therefore, PHS/EHD will <br /> allow the installation of temporary monitoring wells at this site. <br /> This is a site specific decision on the installation of temporary <br /> monitoring wells and does not constitute approval for this <br /> technique of investigation at other sites within San Joaquin <br /> County. <br /> As discussed in a telephone conversation between Margaret Lagorio <br /> of PHS/EHD and Bruce Eppler of GTI on November 22, 1993, the <br /> temporary monitoring wells will be installed on day one of the <br /> investigation. The second day the wells will be developed, <br /> sampled, and destroyed. The wells will be destroyed with cement <br /> grout placed into the sand pack using the well casing as a tremie <br /> pipe and removing the well casing as the grout rises to the top of <br /> the well casing. <br /> If the above method of destruction cannot be accomplished., over- <br /> drilling of the temporary monitoring wells and destruction of the <br /> A Mvbion of Son JO qW0 GoW"KftM fjm Savkm 10 <br />