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MW FINAL REMEDIATION PLAN Shell Oil Coma 620 West Charter Way,Stockton,California Delta Project No.404&586 Page 22 Ground-water remediation will be accomplished by'c�aractfon;treatmentAud dLs pm-L Tho gound walers -Oontainh;g dissolved petroleum constituents wj1Ebe.ptimpedfrotim weusuw,MW-7,-and at an approidmatc-rate:of Q8,gpm_per-welI vWera vacuum of 8 inches Ng for,a:maximum total flow rate ,,of-2,4 gpnLt:From:monitoOng.1p�4,MW-2,MW-7,"and MW-9,the groulud water discharge will.be passed" through apetrol.emproductMatersepariorcant,lbeeirti-itwill then fldWthrough adual�stggegrgpular-P actMVM'6rbon-system,:,..j:carbon system was chosen as a treatment method based on its hydrocarbon removal efficiency, the low ritzign flow rate, and economical considerations for meeting the discharge requirements. Water ftm the:imatment system,will then be directed to.the,01y,sanitary.sewer,A The water-phase granular activated carbon treatment system design summary is given in Appendix G of this report. -A'he desigii-eniculatIons"Specify;- -IMAmit tarbon train% -Ab4otb.er:ufiiL',-Wffl_&—JaifL apprcrdmtttei,200obhcii6fgranular`activated cirbbilI 71a.units will b&pliced fif series;-with a sgriplU tap and boGster pump,between the units.empty bed contact time will be approximately 20 minutes per unit, and breakthrough of tM`lead unit is expect 4_p 9l;cq, pTavmately 6.0 days, Whcn,breakthwugh.on.the lead unit occurs;the secondary unit.will put�iu.the lead configuration and a 4 new unit will.be placed in the secondary configuration. In this manner,the maximum amount of petroleum constituents can be adsorbed while utilizing the minimum amount of carbon, Spent carbon units will be sent. off site for regeneration of the carbon. An LEU meter will be installed,as required by-the City,to shut the system off in the,event.that.the air hydrocarbon-concentrations at-the pnint of-discharge into the sewer exceed 10 percent of"the LEL'.of- -gasolim A flow sheet for the combined soil and ground water remediation system is shown in Figure 10. A site plan showing the proposed equipment location is shown in Figure 11. Figure 12 showi the detail of the remedial equipment area.