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PUBLrC HEALTH SERVICES <br /> OPp.U1N: C <br /> SAN JOAQUIN COUNTY <br /> Q: .a <br /> JOGI KHANNA 31.1).,M.P.H. <br /> Health Officer P <br /> P.O. Box 2009• (1601 East Hazelton Avenue) Stockton, California 95201 <br /> (209) 468-3400 <br /> v <br /> MANUEL SANCHEZ <br /> PACIFIC GAS <br /> 920 SOUTH DAVID AVENUE <br /> STOCKTON CA 95205 <br /> Ja.�tl �� �� 1 el-'r <br /> RE: 2088 MARIPOSA ROAD SITE CODE: 1671 <br /> STOCKTON CA <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has completed the review of the "Monitoring <br /> Well Installation and Quarterly Report" dated November 1993 , <br /> submitted by Geological Audit Services, and has the following <br /> comments. <br /> The analytical results from the installation of the three <br /> monitoring wells has confirmed groundwater contamination at this <br /> site. As all three wells are impacted, additional wells need to <br /> be installed to determine the full extent of the groundwater <br /> contaminant plume. Should additional physical data indicate a <br /> co-mingling of two or more groundwater contaminant plumes, a <br /> coordinated effort on the part of all responsible parties may be <br /> warranted. <br /> Given the past redevelopment of the area surrounding the site, <br /> the recommendation in the report for a historical investigation <br /> appears to be warranted at this time. <br /> The report mentions several remedial options addressing the <br /> contamination found at this site. Without site specific <br /> feasibility testing, it is premature to rule out any remediation <br /> alternative. Feasibility testing must be conducted concurrently <br /> with the contaminant assessment work for all remedial <br /> alternatives being considered for this site. This information, <br /> as well as the plume definition information, is required for <br /> inclusion in the Corrective Action Plan. The decision to use a <br /> particular remedial alternative for a site must be based on site <br /> specific physical data clearly indicating the alternative to be <br /> the most efficient for the site. <br /> A Division of San Joaquin county Health Cine Services <br />