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Geological Audit Services, Inc. <br /> Environmental Professionals <br /> MW 1803 March Lane.Suite A•Stockton.CA 96207-6414-(20#)956.0264•Fax(209)sYs-0700 <br /> March 3, 1994 <br /> SC-95-01-1078-02 <br /> I <br /> Ms. Mary Ways <br /> San Joaquin County PHS/EHD <br /> P. Q. Box 398 <br /> Stockton, CA 95201 E <br /> E <br /> i <br /> Subject Vapor Extraction Test <br /> Marlowe Properties <br /> 4645 Waterloo Road, Stockton,Californian <br /> Dear Ms. Ways- <br /> c <br /> In accordance with the request of our client, Mr. Jonathan:Marlowe, Geological Audit <br /> Services, Inc. (GeoAudit) will be performing an eight-hour!,vapor extraction test at the <br /> subject site. <br /> 1 <br /> 1 <br /> e <br /> Vapor Eximcgion Test <br /> i <br /> s <br /> A portable internal combustion system will be setup on-site abd operated for a period of S <br /> to 10 hours to determine the subsUrface permeability to vapor,'radial influence of the vapor <br /> extraction well and the initial hydrocarbon recovery rate. <br /> These parameters will facilitate in the design of the SVE 4stem and will be used to <br /> determine the number of vapor wells, the spacing of the wellg and the selection of a vapor <br /> remediation system (i.e, internal combustion, thermal oxidatipn, etc.). The selection of a <br /> vapor remediation system will be determined by evaluating the concentrations of extracted <br /> hydrocarbon vapor and the estimated supplemental fuel requitements for each of the vapor <br /> remediation systems.The determination of these parameters atte absolutely necessary for the <br /> design and implementation of a SVE system that can meet tie remediation objectives. <br /> Remediation well VW-1 will be used as the primary extraction well, Monitoring well MW-1, <br /> which presently contains only a few feet of water, will bi used an observation well. <br /> Additionally,two of the remaining monitoring wells (MW-2 tw' ough MW-4)will be used as <br /> an observation wells. <br /> 1 1 <br /> Full Spectrum Environmertw Services•Hydrog¢ofogy <br /> 1 <br />