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�y FINAL REMEDIATION PIAN Shell Oil Company ^� 620 West Charter Wary,Stockton,Calirornia Dena Project No.4a.M-586 Page 17 ' Was destg*ied using a malarnurn*flow rate of 3 gpm Erom each Pumping well for a totel tataxirrum flow of aPPrMdmately 13 gP.MJ If additional off-gild wells became ner.essury,the r ijj f d syat to finny; eactzndcd t from either monitoring wwll W-7 or .9 with minimal impact to cdeimg ststtan operations;t r s 3.7 Interlto Free Product Skim j[REgnqdLRRtgqM Or,December 12,1989,the hydrogealagic investigation revealed approximately 4.5 feet of free product in monitorIZ9 well My-Z, Weekly balni;g of free product from monitoring wen MW-2 did not reduce the 1:r i product thickness,Indicating that an automatic product skimming system was warranted. Therefore, t- tiporated bladder pump coupled to a floating product skimmer :w i!sstad d,on April.l3,l9gp,.3cr.rn*at erinl; ra -Alf is suPPRed to the skimming pump through the compressed air manifold system,and the free product is routed to storage drams ai the retnedial equipment area through the water manifold piping i system. Approximately 180 gallons of producl hm been te8lovedtodale. Tho product storage drums are underlain by a double containment system,and areui e9 FPS with stank-fuI!shutoff to shin off the air t_. compressor to the pump when the drum is rearing capacity. To provide electric power for the air i compressor and also for future remedial equipment instauation,a 200-amp temporary electrical service was fig installed. For a more complete description of the free product recovery system,please see Delta's Interim Remedial Action Plan and Frflposed]`reject Schedule letter,dated April 13,1490,presented in Appendix A. e 4_QP�MI✓DIAL ALTFRAIA'lIVES SCREL:NING AND SELFt;d'ION ! �k All practical remedial technologies were Initially screened for this site. Prior to station reconstruction,the I former four underground gasoline storage tanks and product lines were removed,and soils in the immediate i vicinity of the tanks were excavated. Approximately 1,100 cubic yards of soil containing petroleum l constituents were excavated and disposed. Shell then received regulatory approval to proceed,and complete r station reconstructloa with the condition that any remaining petroleum constituents in the soil and ground l,r water would be cleaned up by in-situ methods. For this reason,Delta installed (in conjunction with the 1 station reconstruction)the manifold system described in Section 3.6 of this report. 'Ihe'„tl alto rcttlMlal tt=c sold flee possd r the cleanup of,the remainint1; 1 k:t • � _ �. Bich:.that..wlll. br o fo sii��Itudht� - ,• � .,. .r ..,.. ,,l�roleusn, t _.,, :, Ott[at tAb aitvi�l,bp rttstaitttltigtt rsf suit v tin u eA g And gees nd wat$ri y n