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PUBL!C HEALTH SEtICES <br /> SAN JOAQL'IN COUNTY <br /> IOGI KHANNA M.D.,M.P.H. S <br /> Health Officer <br /> r . <br /> P.O. Box 2009 0 (1601 East Hazelton Avenue) 0 Stockton, California 9520 <br /> 4GIFO0�`P <br /> (209) 468.3400 <br /> cc, <br /> MR JEFF WERNER <br /> GEWEKE LAND DEVELOPMENT MARKETING <br /> 1045 SOUTH CHEROKEE LN MAY 2 9 199� <br /> LODI CA 95240 <br /> RE: 16 SOUTH CHEROKEE LANE SITE CODE: 2065 <br /> LODI CA 95240 <br /> CLEANUP AND ABATEMENT ORDER NO. 90-702 <br /> Public Health Service, Environmental Health Division (PHS/EHD) <br /> has received the attached comments from the Central Valley <br /> Regional Water Quality Control Board (CVRWQCB) following their <br /> review of the Final Remedial Action Work Plan (FRP) prepared by <br /> Geological Audit Services, Inc. There is no objection to the <br /> concept of the overall plan, however, the content of the FRP is <br /> lacking necessary information and explanation. Please submit the <br /> following to act as a supplement the previously submitted FRP: <br /> 1. Maps and figures depicting the extent of soil and <br /> groundwater contamination; <br /> 2 . A complete discussion of the soil vapor extraction system <br /> including: <br /> a. The reference to 500 ppm as hexane and the proposed <br /> procedure and rationale for determining when vapor <br /> extraction is no longer necessary; <br /> b. The rationale for extending the vapor extraction well <br /> screens from 4 to 70 feet rather than installing <br /> cluster wells at discrete depths; <br /> C. A proposal to investigate and remediate the soil layers <br /> previously in contact with contaminated groundwater. <br /> 3 . A complete discussion of the groundwater extraction, <br /> remediation, and reinjection system, including: <br /> a. The location of an extraction well, which contains <br /> sufficient water to be used for extraction all year, <br /> either the existing EW-1 or a new well to be <br /> constructed near or as a replacement for MW-4 ; <br /> A Division of fan Joaquin(ounry Health tarc S mcrs <br />