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California lesional Water Quality4)ontrol Board <br /> Central Valley Region <br /> Terry Tamminen Robert Schneider,Chair , <br /> Secretaryfor Arnold Schwarzenegger <br /> Environmental 3443 Routier Road,Suite A,Sacramento,California 95827-3003 Governor <br /> Protection (916)255 .s •Fax( 255-3015 ECE� V ED <br /> ht[p://wwwb.ca.gov.gov/rwgc65 D R <br /> JUN 14 2004 <br /> June 8, 2004 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Randtron <br /> C/O Clifton J. McFarland <br /> Attorney at Law <br /> Gibson, Dunn & Crutcher, LLP <br /> 333 South Grand Avenue <br /> Los Angeles, CA 90071-3197 <br /> Dear Mr. McFarland: <br /> LIMITED SUBSURFACE INVESTIGATION AND OZONE SPARGE PILOT TEST <br /> WORKPLAN, LODI SOUTH AREA, SAN JOAQUIN COUNTY <br /> The Regional Water Quality Control Board (Regional Board)has reviewed Randtron's submittal <br /> entitled"Limited Subsurface Investigation and Ozone Sparge Pilot Test Workplan, Lodi South <br /> Area", dated May 2004. Regional Board staff has reviewed the report and our comments are <br /> provided below. <br /> A groundwater extraction and treatment system is currently being operated in association with <br /> the groundwater clean up at the former Chevron Service Station located at 301 West Kettleman . <br /> Lane. The proximity of that site to the South Area contamination, in conjunction with a lack of <br /> characterization of the limit of the PCE contamination area to the west, lead us to conclude that <br /> an additional CPT location should be included to determine the western extent of the PCE <br /> contamination. We have discussed this with Deems Padgett of TRC and we understand that the <br /> Workplan will be modified to include this additional CPT location. <br /> Subject to the above, Regional Board staff concurs with the Investigation Workplan. Of course, <br /> additional work may be required depending on the results of the proposed investigations. Also, <br /> please notify the Regional Board staff at least three days prior to the start of the investigation <br /> fieldwork. <br /> Regional Board staff also concurs conceptually with the proposed Ozone Sparging Pilot Test. <br /> Please provide the Regional Board with a detailed sampling and analysis plan for the ozone <br /> testing which includes the wells to be sampled, the frequency of sampling events and the <br /> constituents for which the samples will be analyzed. <br /> California Environmental Protection Agency <br /> 2eci sled Paper <br />