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rT- <br /> 9--. - <br /> w <br /> ---ti INTERNATIONAL <br /> 93 TECHNOLOGY <br /> CORPORATION <br /> January 10, 1992 <br /> rr Project No. 140844.3.2 <br /> Mr. Mike Infarna <br /> San Joaquin County <br /> Post Office Box 2009 <br /> Stockton, Californir. 45201RE C E I "IE: D <br /> Addendum to Work Plan JAN 13 1992 <br /> Soil Venting Pilot Study_ ENVIRONMENTALF EALfi•i <br /> BP Facility no. 1I142 PERMIT/SERVICES <br /> 1403 CountryQub Road <br /> Stockton. California <br /> Dear Mr.Infuma. <br /> During recent tank removal reconstruction and site assessment activities,horizontal collect,M <br /> piping and vertical vadose monitoring wells have been installed on site (Figure 2)for possile <br /> use as a soil vapor collection system. Sort vapor extraction(SVE) is a remediation technique <br /> which involves creating a subsurface vacuum which induces in situ vol:,-ilization of adsorbed <br /> residual gasoline. <br /> IT Corporation intends to conduct a test of this system to determine whether it will be an <br /> effective remedial strategy. The pilot test will be conducted over a 24 to8 hour period. A <br /> vacuum pump will be attached to both the horizontal piping and (possibly)the vertical vadose <br /> wells 'VW-1 and VW-2 (one at a time), while pressure influences in the remaining vadose <br /> (VW-1 or VW-2) and groundwater monitoring wells (MW-1,MW-3 through MW-7) are <br /> monitored. Extracted vapors will be routed through two carbon canisters(in series)prior to <br /> discharge. Influent vapor samples at the beginning,middle, and end of the pilot study will be <br /> collected in tedlar bags and analyzed for total petroleurn hydrocarbons (as gasoline) and <br /> BTEX, A photoionization detector will be used to monitor hydrocarbon conccntratiors <br /> between the canisters and the effluent vapors. <br /> Test results should provide an estimate of the radius of influence for the horizontal and <br /> vertical dotted pipes and an idea of the concentration of hydrocarbons which can be <br /> extracted. Based on these data, a decision can be made as to whether SVE is a viable <br /> remediation alternative. <br /> Regional Office <br /> 4585 Pacheco Boulevard•Martinez,California 94553•510-372-9100 <br /> F Corporation ss a wholly a med subnd;ary of l:llemahonal TechnalogY Corporatran <br />