ARCHIVED REPORTS XR0012563 - Laserfiche WebLink

Home Browse Search

AN ON 5RN i , X N N gamw x", zY s! a. ."`.. 'yQ ,^,.. _".i ;t moo-, ANAL R r'ME 1)IATI 0 N PAN Shell Oil Company 620 West Charter Way,Stockton,California W Delta Project No.40m.586 ]Page 21 7114 thermal O)ddi=reduces hydrocaftai enlbsg*()a$to the aimospherC With a destruction efficiency between 95 and,99 PerIctat.and is most CoSt-effeC i I ve at hYdrocarbon concentrations above 3X0 ppm.--Since extractionc6n' 'ntrt'ifonsafapptdjdihiiely,Z000,ppMivblibbgeiv,d-du6j tests,ai thermal ct„idirer..�+i11• be used during the ihst phase of site reMeuj4Onj 7-f"44 ,1 Soil remediation will be accomplished by soil vapor extraction. Results Of the Soil vapor extraction test (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 remediation system. iy Initially, monitoring wells MW-2, MW-7, and MW-9 will be opened to the inlet side of a positive displacement blower. Monitoring wells MW-2 and MW-7 were selected as active vapor extra;tion 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 maintaiv,a proper vapor exchange rite in the soil,55 cfm a er well must be achieved. For vapor exchange rate calculations,see Appendix F. 'rlie%-blower,outlet-will be directed to the following emission control devicm:duriak the COUMC'OfSystem Operation., a-thermal(hddizer,unto hydrocarbon concentrations Fall- below 3,000,ppm, thenipossibly to 2'catIllytic-oxidizef. When.hydrocarbon concentrations fall:.belnw aPProximat0y_150 PPm,soil test Wrings will be drilled to determine remaining concentrations in soil. lf� closure cannot be obtained at this time,the soil vapor extraction system may be vented through activated carbon until closure can be obtained through later confirmation borings.,The,specific thermal oxidize chosen for the first Phase or remediation will be included in the final authority to construct permit from. the APCD.AJnfbrnlation regarding all of the units will be provided with the Permits to construct and operate. Jin the future,additional soil venting is required,monitoring wells MW-3,MW-4 and MW-5 can be opened for venting since these wells are already manifolded. Figures 11 and 12 show the system layout. Figure 10 shows the inferred vacuum influence Of monitoring wells MW-2,MW-7,and MW-9. The.wermai oxidizer and catalytic oxidizer units Will be sldd-mounted and will inchMe a separate blower.