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07/14/2003 16 23 2094683433 FIFTH FLOOR PAGE 02 <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> gate N <br /> = � SAN JOAQUIN COUNTY <br /> Z i Una Supervnnn <br /> yDonna X Heran.R 1r H S <br /> � 304 East Weber Avenue, Curl Bor Third Floor &nnan R E N S <br /> Al Olsen,R-LAI S Stockton, California 95202-2708 Mikc Huggins,R E 1.1 S R D 1 <br /> crq --=a,¢ • Prograin ManagerTele hone 2A9 4b8-3420 Douglas W Wilson,R E H S <br /> Laurie A Cotulls,R.E FLS } Margaret Lagono,R E H S <br /> Progrom Manager Fax (209)464-0138 Robert McClchon R 1=H S <br /> Mark Barcellas,R E H S <br /> ' CRAIG OGA 1 A <br /> DIRECTOR OF FACILITIES MANAGEMENT <br /> SAN JOAQUIN COUNTY <br /> 212 N SAN JOAQUIN STREET SUITE A <br /> STOCKTON CA 95202 <br /> ' RE 1810 E Hazelton Ave, Stockton Site Code 1141 <br /> ' <br /> WORKPLAN-AN- Addition Site Assessment and Remedial Feasibility Testing <br /> DAIED March 7 2003 <br /> PREPARED BY Ramage Environmental <br /> ' APPROVED X <br /> DISAPPROVEDD5 <br /> A! �UM1U- F_DED Submit by <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN[H&S 25299 37,subd(c)(3)) <br /> 1 To install 3 monitoring wells to define the lateral extent of groundwater contamination To collect soil <br /> samples and ground water samples for analyses of gasoline fuel constituents including 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 au sparge wells for analysts <br /> 4 To conduct an 8 hour vapor extraction pilot test and a four hour air sparge pilot test The pilot test will <br /> be conducted using the proposed wells and existuig wells <br /> 5 Pnor to remedial testing,a ground water baseline will be cstabbshed using samples 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 />' addibonal investwation and rernedial feasibility testing <br /> 7 To continue with quarterly grotaid water monitoring and sampling To continue with Quarterly <br /> R,eporttng to EHD and CVRWQCB <br /> COMMENTS AND CONDITIQNS <br /> 1 The verncal extent of soil and ground water contamination need to be defined <br /> The"Tri-Regional Board Staff.,Recommendations For Preliminary Evaluation and Investigation of Underground <br /> Tank Sites'along with its'Appendix A"and"Appendix B"should be used as guidance documents All work and <br /> reports Which require geological or engineering evaluation mtist be performed under the direction of an appropnate <br /> California registered or certified professional <br /> i <br />' DATED U <br />' HarlinKn 11 Smm r REHS 209 468-3442 <br />