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ENVIRONMENTAL HEALTH DEPARTMENT <br /> PgU,IN SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heron,R.E.H.S. <br /> 304 East Weber Avenue, Third Floor Cad Borgman,R.E.H.S.' Director Mike Huggins,R.E.H.S.,R.D.I. <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • Cqt/FOR��F'• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> JAY MCILRATH APR 3 0 2003 <br /> JC & M MCILRATH <br /> PO BOX 326 <br /> STOCKTON CA 95201 <br /> RE: JAMAR Service SITE CODE: 1667 <br /> 4075 Main Street <br /> Stockton CA 95212 <br /> San Joaquin County Environmental Health Department(SJC/EHD)has received the report <br /> "Fourth Quarter 2002 Groundwater Monitoring Report and Additional Assessment Report"dated <br /> March 2003 that was submitted on your behalf by GHH Engineering, Inc. (GHH), and is in the <br /> process of reviewing it. <br /> One recommendation of the report is the installation of down gradient monitoring wells, screened <br /> both shallow and deep,for lateral plume definition. Please note that the installation of these <br /> wells, and the installation of a groundwater extraction well onsite, had been previously approved <br /> and the deadline for their installation was January 15, 2003. You were notified of this as the final <br /> deadline in SJC/EHD correspondence dated December 20, 2002. <br /> The report recommends the installation of two sets of cluster wells, one on the northeast corner <br /> and one on the southeast corner of Main Street and Oro Avenue. A'cluster well' is one or more <br /> separate wells located within close proximity of each other, but screened at different depths in the <br /> aquifer. Proposed screen intervals for the two wells in each cluster are 55-75 feet below surface <br /> grade (bsg),to intercept first groundwater, and 90-110 feet bsg, to intercept a possible water <br /> bearing zone at approximately 100 bsg. Cone penetrometer test (CPT) borings were completed <br /> at both these locations in January 2003. GHH has interpreted this possible deeper water-bearing <br /> zone from the CPT logs. However,technical difficulties experienced with the CPT equipment <br /> leaves the lithology below 60 feet bsg in the area of the southeast corner in question. <br /> SJC/EHD approves the 20-foot screen interval of the shallow wells to be built to intercept first <br /> groundwater. SJC/EHD does not approve a screen interval of 20 feet for the deep wells. The <br /> maximum screen interval for the deep well casings shall be 5 feet in length. Due to the problems <br /> with the CPT equipment, the borings for the deep wells must be continuously cored across the <br /> general target depth zone to insure placement of the screen in an appropriate lithologic interval. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> cov" [-,��a v1% <br /> Lori Duncan, Senior REHS Nuel C. Hen erson, Jr., RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James L.L. Barton, CVRWQCB <br /> David Irey, Office of the District Attorney <br /> Tom Ballard, GHH Engineering <br />