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i <br /> PUBLIC H?ALTH SERVIC S OPO,U N C <br /> SAN JOAQUIN COUNTY N h <br /> j ENVIRONMENTAL HEALTH DIVISION ` <br /> Karen Furst, M.D., M.P.H., Health Officer °°crFoad v <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> FRANK COELHOCOPY <br /> COELHO & BACCHETTI INC <br /> 7474 ELEVENTH STREET <br /> TRACY CA 95376 <br /> RE: C & B Equipment SITE CODE: 1564 <br /> 7474 Eleventh Street <br /> Tracy, CA <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed the "Work Plan" dated December 22, 1999 prepared by <br /> Geological Technics Inc. for the above referenced site. The work plan is <br /> approved with the following comments and conditions. <br /> The work plan proposes locating wells within a 1000 feet radius of the site. The <br /> Tri-Regional Board Staff Recommendations Appendix A requests that all private, <br /> municipal, and irrigation wells within 2000 feet of the site be identified, so the <br /> area for locating wells should be extended to within 2000 feet. Many of the wells <br /> in this area were installed prior to the requirement of submittal of well logs to the <br /> i Department of Water Resources or the requirement to obtain a permit from our <br /> agency for installation of a well. Therefore, visual identification of wells serving <br /> parcels within 2000 feet of your site on Eleventh Street, Chrisman Road, and <br /> I Cabe Road by you or your consultant is the best method for locating the wells. <br /> I San Joaquin County well standards require that monitoring wells in areas of <br /> contamination be destroyed by "overdrilling" (removing all material within the <br /> original borehole) and filling the hole with grout. Therefore, monitoring wells <br /> MW1, MW2, MW101 must be overdrilled and grouted. Monitoring wells MW3, <br /> MW4, MW5, MW6 and MW7 can be destroyed as proposed in the work plan. <br /> In planning the location for a new domestic well, there are required horizontal <br /> distances from property lines, and potential sources of contamination and <br /> pollution that have to be met pursuant to the San Joaquin County well standards <br /> (copy of sections of well standards enclosed). At this site the septic system, the <br /> former underground storage tank contamination area, and the sump/wash down <br /> area would be sources of pollution or contamination. Also, there is a minimum <br /> depth for the annular well seal of 100 feet. Local conditions such as the <br /> contamination at this site and the "Tracy Defense Distribution" site may require a <br /> 200 feet depth for the annular well seal. Corcoran clay may be encountered at <br /> this depth so the new well may have to be drilled very deep. Otherwise <br /> application for a variance for the 200 feet depth annular well sealmay be made. <br /> A Division of San Joaquin County Health Care Services <br />