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page 2, 640 EI Dorado <br /> The data presented by Ground Zero forms the basis of a hypothesis that the 819 Hunter <br /> site is the source of the PCE contamination on your site, but does not demonstrate that <br /> this is the case. Before SJC/EHD could consider revising the directive to complete the <br /> investigation of the vertical and lateral extent of the groundwater contamination at your <br /> site, it would be necessary for you to demonstrate that all of the PCE contamination on <br /> your site has migrated there from another site. This demonstration must adequately <br /> explain all of the data, including the 2.6 milligrams per kilogram (mg/kg) and 2.3 mg/kg <br /> PCE detected in soil samples T1-1 and SP-1,2, respectively, collected on your site. <br /> The deadline for submittal of a work plan to continue the investigation of the vertical and <br /> lateral extent of the groundwater contamination at your site remains December 17, 2004. <br /> Failure to submit a work plan by this date may result in referral of your site to either the <br /> Central Valley Regional Water Quality Control Board or the San Joaquin County District <br /> Attorneys Office for enforcement action. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Lori Duncan, Senior REHS Nuel C. Henderson, Jr., RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton, CVRWQCB <br /> John Lane, Ground Zero <br />