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07/-1-4/2003 16 23 2094683433 FIFTH FLOOR PAGE 02 <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> N UIN COUNTY SA JOA Q pnrt supervrson <br /> Donnas K Heran,R EH-SCM Borgrn m RE H S <br /> °j Dirccror 304 East Weber Avenue, TkttXd Flooar Miko Huggins,R E H S R n I <br /> AL Olsen,FLEAS Stockton,Callfornia 95202-270$ 1)ouglas w Wilson,R E H S <br /> 11rogram Monagc r Telephone (209)468-3420 Margaret Lagono,R E H S <br /> Laune A.Cotulls,R-E ELS. Robert McClca1oM RE 1i S <br /> Program Manager Fax (209}464-0135 Mark Bareellos,R E H S <br /> CRA10 OGA'I A <br /> DIRECTOIL OF FACILI=MANAGEMENT <br /> SAN JOAQUIN COUNTY <br /> 212 N SAN JOAQUIN STREET SUITE A <br /> STOCKTON CA 95202 <br /> RE I I10 E Hazelton Ave,Stockton Site Code 1141 <br /> WORK IRLAN Addition Site Assessment and Remedial Feasibility Testing <br /> DATED March 7 2003 <br /> PREPARED BY nonage Enviro=Wntal <br /> APPROVED <br /> D1 VED11 <br /> AJ UM_N EDED Submit bY. <br /> ADE U TE AND NECES E EMENTS OF THE WORK I' [H&S 25299 37,subd(c)(3)J <br /> 1 To install 3 nwnitornlgg wells to define the.lateral extent of Srouad water conrammation. To collect soil <br /> samples and ground water samples for analyses of gasoline fuel constituents inchidmg fuel oxygenates <br /> and 1,2-DCA <br /> 2 To install one nested vapor extraction well and one nested air sparge/vapor extraction well <br /> 3 To collect soil samples from the vapor and air sparge wells for analyses <br /> 4 To conduct an 8 hour vapor extraction pilot test and a four bour air sparge pilot test. The pilot test will <br /> r be conducted using the proposed wells and exishug wells <br /> 5 prier to remedial testing,a ground waterer baseline will be established using saxiiples collected from <br /> MW 1,MW2 and from the proposed deep extraction well <br /> 6 A corrective action report will be completed and submitted which will include the results from the <br /> additional investigation and remedial feasibility testing <br /> 7 To continue with quarterly ground water rnonito mg and samplmg. To continue with Quarterly <br /> Reporting to EHD and CVRWQCB. <br /> C_O_MMENTS AND CO I�JQNNS_ <br /> 1 The vertical extent of soil and ground water contavm2ati u tr n to be defined tion of Underground' 'rile"Tri-Regional Board Staff'Recommendations For P.relimmary E � <br /> Tatik Sites"along with its"Appendix A"and"Appendix B"should be used as guidance documents All work and <br /> reports which requue geological or engineering evaluation must be perfomwd under the direction of In appropnate <br /> Cahfoima registered or certified professional <br /> D TED URy <br /> Harlin n r REHS f209)468=3442 <br />