ARCHIVED REPORTS XR0012563 - Laserfiche WebLink

Home Browse Search

AoC°. ". :.F. ar a "a••a •�u, a n ..v-, ��a- s. ll �.a MAL REMEDIATION PIAN_ Shell Oil Company 620 West Chatter Way,Stockton,California Delta Project No.4 .88-586 Page 21 'The thermal oxidizer reduces hydtoc-arbon emisriord to tho`atm*hefe with a destruction efciefiq beta. , t a X95 and 0993 pesaa k and is most cost-effective athydrocarbon ydrocarbon concentrations above.3Au"+7,"m.--Since . extrtctioneancentrallons of'approicfmatefyi`12;lXlb`ppm tveie3 eb�erved during[eats, ►al ozidiaer:will- i a la:nsed during the brat phage of site remodiationa i ' 44 Conrentu„i Resign Soil remediation will be accomplished by soil vapor extraction. Results of the soil vapor extraction test i a (which can be found in Section 3.5.2 and Appendices E and F of this report)indicate that soil venting is a (" feasible soil remediation method. Figure 9 shows the process flow sheet for the soil and ground water 15 remediation system. Initially, monitoring wells MW-2, MW-7, and MW-9 will be opened to the inlet side of a positive . ., displacement blcwer. Monitoring wells MW-2 and MW-7 were selected as active vapor extraction wells because of their relative locations within the free product plume. Monitoring well MW-9 was chosen as an active vapor extraction well because this soil boring contained high TPH concentrations(see Table 1). TO 3 maintain a proper vapor exchange rate in the soil,55 cf n per well must be achieved. For vapor exchange rate calculations,see Appendix F. 'Pira blosrertlet vrill-be directed toxtlt2 followitag emissivtt vontrol ,deviers-durfng the-coursa'cf system operation a•thermal oxidizer,`lintit-hydmmrbon-c�ncentmtiom fall- . � 1 s .bdow"3,w'ppm,.then.possibly-to a-'castalytic-oxldizer.-When-hydrocarbon concentrations-fall-below 14 approx1mately"150 ppm;soil test borings will be dolled to determine remaial S con=ntrations4wzoll:;Llf• closure cannot-be obtained at this time,the:od.vapor;,Wraction systemlmay:be.veatcd through,activatgd i carhowuntil•elosttre can be obtained through later confirmation bodngs..t 7401 specific-thermal•osidize� l: chown,for the fast ph.".of site remadlation v4ll be included in the final authority to construct penait from 5 the APCD.-ta5orizatfor.Teggrding all of the units will b6provided with thrs permittl to canssruet snd.apt:ca ceA If in the future,additional soil venting is required,monitoring wells MW-3,MW4,and MW-5 can be opened 11 for venting singe these wells are already manifolded. Figures 11 and 12 show the system layout. Figure 10 t shows the inferred vacuum influence of monitoring wells MW-2,MW-7,and MW-9. l Thhe_therma1.oxulizer and catalytic oxidizet.units,wili,he skid!.mounted,apd,w)[l,include ase arateblower, l�. 1 � r4 t