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4 <br /> San Joaquin County DIRECTOR <br /> Donna Heran, RENS <br /> Environmental Health Department <br /> ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla, REHS <br /> Stockton, California 95202-3029 <br /> s PROGRAM COORDINATORS <br /> Carl Borgman,REHS <br /> Mike Huggins, REHS, RDI <br /> o a�P Website: www.sjgov.org/ehd Margaret Lagorio,-REHS <br /> I L F R Phone: {209) 468-3424 Robert McClellon,,REHS <br /> Fax: {209) 464=0138 Jeff Carruesco,REHS,RDI. <br /> Kasey Foley,REHS <br /> Thomas Altwies <br /> Manna-Pro Products, LLC <br /> 707 Spirit 40 Park.Drive, Suite 150 <br /> Chesterfield, MO 63005 <br /> RE:4004 S. El borado Street Site Code: 1088 <br /> WORK PLAN: Corrective Action Plan-Addendum <br /> DATED: 10 February 2009, <br /> PREPARED BY: GEO-PHASE ENVIRONMENTAL i <br /> APPROVED: [X] <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN ]H&S 25296.10(c)(3)]: <br /> 1. To increase the vaporextraction rate in the area of the highest contaminant concentrations,two <br /> additional remedial wells will be installed:one vapor extraction well and one air-sparge well. <br /> 2. The remedial wells will be construcfed in a similar manner to those described in the Corrective Action <br /> Plan (CAP).' <br /> -3. Selected.soil samples will be-collected during drilling,.field screened, and analyzed to determine soil <br /> contaminant concentration fora base line. <br /> 4. Selected soil samples will be.analyzed for:THP-gas, and•BTEX. No gasoline additives or oxygenates <br /> has been evidenced during prior site assessment or on-site remedial activities to date. <br /> .5. The new wells will be plumbed to the existing remediation equipment and used immediately upon <br /> connection. <br /> 6. Existing MW7, located off-site and up-gradient of the contaminated source area, has a long history of <br /> non-detect and no longer service any valuable purpose for this project. MW7 will be destroyed by <br /> pressure grouting. <br /> COMMENTS AND CONDITIONS: <br /> 1. This additional work will help in contaminant mass removal and conforms to State Water Resource <br /> Control Board 5 Year Review Letter recommendations dated 14:March 2008. <br /> 2. The'MW sampling frequency reduction, proposed Lander separate cover, has-been reviewed and <br /> -approved byEHD. <br /> 3. A remedial,report update should be provided to EHD and CVRWQCB within 90 days of remedial <br /> mod ifi cationlaugmentation adjustments. <br /> DATED. .�- o`Ld O BY I <br /> Harlin Knoll,-Senior REHS (209)468-3442 <br /> CC: Tony Palma <br /> GeoPhase <br /> l <br /> l <br /> M <br />