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A�u�N <br /> PUBLICVHEALTH SERVICES o_.. ...� <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 (1601 East Hazelton Avenue) Stockton, California 95201 <br /> (209) 468-3400 <br /> January 2, 1991 <br /> Mr. Gregory Fletcher <br /> Environmental Coordinator <br /> Conoco, Inc. <br /> P.O. Box 4784 U <br /> Houston, TX 77210-4784 <br /> RE: Former Econo Gas Station IN REPLY REFER TO SITE CODE: 1753 <br /> 4325 E. Washington <br /> Stockton, CA <br /> Request for Groundwater Monitoring Proposal <br /> We recently reviewed our files for this site and entered it <br /> into the Local Oversight Program. Due to the steady decline in the <br /> water table in this area of San Joaquin County, nearly all the <br /> groundwater monitoring and recovery wells for this site have gone <br /> dry. <br /> Although the vapor extraction system for this site appears to be <br /> effectively removing volatile hydrocarbons from the subsurface, it <br /> will still be necessary to monitor groundwater to evaluate the <br /> extent of contamination and the effectiveness of the remedial <br /> action. Therefore, we request that you submit a proposal for <br /> groundwater monitoring. This proposal should include planned <br /> monitoring well locations for redefining the aerial extent of the <br /> plume, and for monitoring hydrocarbon concentrations within the <br /> plume. <br /> Please submit the requested proposal to this office and to the <br /> California Central Valley Regional Water Quality Control Board by <br /> February 28, 1991. <br /> Pursuant to Section 280 . 67, Subpart F of 40CFR of the Federal <br /> Register, San Joaquin County Public Health Services, Environmental <br /> Health Division (PHS/EHD) , will conduct a public notice to consider <br /> comments on your Final Remedial Plan/Corrective Action Plan. <br /> Please prepare an Executive Summary of your draft Final Remedial <br /> Plan (FRP) to accompany our public notice by February 28, 1991. <br /> The draft FRP should provide a summary of: <br /> -data obtained during the Remedial Investigation/Feasibility <br /> Study <br /> -identifiable remedial alternatives <br /> -risks associated with conditions at the site, as well as <br /> risks with the identifiable alternatives <br /> -the proposed and implemented remedial alternatives. <br /> A Division of San Joaquin Counry Heakh Care Services <br />