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Wwapnn roe Nuau 17 wxl F mll.eba.y i MrImR o.ro.l Aeb Flap Gh We.Wax rlm)he3]Wur a.r.errahce l,od LSl Joiner Pay� A 4 1 composite sal stockpile sample roll also be collected and analyzed fm the above constituents and total lead by EPA Method 601.0 The composite sample Is collected fot disposal Pluposes PRODUCTION WELL SAMPLING In response to the SICHH letter dated September 16 2005(Appendix A)Apex proposes to sample the two municipal drinking water wells located along Dc Bioggr Road on a monthly basis starting October 2005 Apex will contact the Sen Joaquin(ounty Public Wolks for access Analysis wrlI include constituents from the list above INTERIM GROUNDWATER REMEDIATION SYSTEM In response to the SICEH letter dated September 16 2005 requiring an interim imadiaunn system at the ante to halt the off site milp aurin of MTBE(Appendix A)Apex proposes to utilize groundwater pumping and ticatmmt of the)irsr ward zone Apes conducted a 51e review of the Flag City Chevron(FCC)site where a groundwatcl cxitaction system was opetaironal for approximately fact years These groundwater extraction data will he used to design and install a system at the site without the nceusity of conducting pilot testing The FCC site wells yielded a �Pumpmg rate of 4 gallons per Irunate(gpm)with an appioxunate tadius of Influence of 25 feet APLx proposes to Install five six inch diameter extiution wells(EW 1 through EW 5)along the souihein horded a1 the aIle as shown on Figinc 2 The wells will be drilled using a hollow steer auger dell rig All wells will be constructed using Schedule 80 PVC and 0 020 slotted schedule 80 PVC screen The extraction wells will bL Installed to a total depth of 25 feet lits and scieened from 5 to 25 feet bgs One inch diameter schedule.80 PVC piping will be Installed in trenches aPProximately 1 5 feet bgs from each gmundwatei extraction well to the proposed i mediation compound totaled on the west side of the mte Electrical conduits will be touted In the same trench from each well head vault box to an electitcal control panel located in the remediat=ea compound) Individual sample ports with anti backflow check valves will be installed on a Piping and valve manifold inside the remedlatron compound to accommodate individual well flow rates and samphn6 capabihi:cs fbe proposed layout of the rrniedlalion system Is shown on Figure 3 Elccttic submersible pumps capable of lifting water 40 feet at a rate of 5 gpm will be installed in all five extraction wells The extraction well pumps will have automatic controls lot Ptevenuon of dryrun operation The total flow tate for the five wells is expected not to exceed 25 gallons per minute GROUNDWATER TREATMENT USING A BIOREACTOR The aboveground treatment system proposed for this site is an Envuonrnental Resolutmns Inc (ERI)ER1 4000 fluidized bed bioteactor The biaresctoi conssis of a biomass supported oa fine sand The biomass adheres to the sand w lule consuming M7 BF and other gasoline constituents