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S v • .. WORK PLAN FOR " - INSTALLATION OF ON-SITE SOIL VAPOR EXTRACTION ` AND-AIR SPARGE WELLS ARCO STATION 2133, STOCKTON, CALIFORNIA This work plan was prepared for ARCO Products Company (ARCO) for continuing activates at ARCOStation2_133, located-at 2908 Benjamin-Holt Drive, Stockton;California -=-- work plan was prepared in accordance with Task Order 2133-94-4A between Brown and Caldwell (BC) and ARCO The work plan will be submitted to ARCO, and the San Joaquin County Department of Environmental Resources (County) Before commencing work, all necessary permits will be acquired,, and approval,of the work plan will be obtained from the County Work will commence within 30 days upon County approval of this work plan This work plan was completed to perform the installation of five soil vapor extraction (SVE)` ru " -,-and three air sparge_(AS) wells- This work plan describes the methods to be used in the field- during borehole dnlltng, and SVE and 'AS well installation This .play proposes a project - -_- -- _ _-schedule for work at-the site and the+timely subrrmittal of a-site summary report to'the County - --n �after-the_comDie tin n-o Lthio,-nh;)cP-nt_wnrlr PURPOSE r his-work-plan,presentsythe:details-for=installing-five=on-site-SVE=and=three-AS°welis�Two of the wells will be dual-completion SVEJAS wells The purpose of installing these wells is to -remediate=hydrocarbon affected=soils=S-d=groundwater—SVE wells are used to remove _hydrocarbons from the soil under"a vacuum MAS-we lls_are-used_to_inject"air-into=the,groundwater - thereby volatilizing hydrocarbons and promoting biologic degradation of hydrocarbons The proposed well locations are shown on Figure 1 INSTALLATION AND CONSTRUCTION OF SVE AND AS WELLS This"section describes the field methods for SVE and AS well construction Standard field procedures for well completion are described in Appendix A ARCO will be responsible for the - proper rywell destruction when the County agrees that they are no longer necessary " y This is a draft report and is not intended to be a final representation of the work done or recommendations ,Wade by Brown and Caldwell It should nor be relied upon consult the final report 1506WEPOPTSWORKPLAN , J