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� <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY UnitSape"isors <br /> Carl Bergman,R.E.H.S. <br /> Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> ` Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • .. ..-`p• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> 46 F 6W Laurie A.Corolla,R.E.H.S. Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager <br /> JAN 15 2004 MarkBarcellos,R.E.H.S. <br /> RAYMOND GREER ALBERT & WANDA VELDSTRA <br /> RAYMOND GREER CONSTRUCTION 15634 STEINEGUL RDESCALON CA 95320 <br /> 1111 1" ST <br /> ESCALON CA 95320 <br /> Re: RAYMOND GREER CONSTRUCTION <br /> Site Code: 2021 <br /> 15634 STEINEGUL RD <br /> ESCALON CA 95320 <br /> A short-term soilvapor extraction (SVE) pilot test and a long term SVE pilot tests were conducted <br /> at the above-refetenced site in September 2003. Extraction well VE2 was used as the extraction <br /> point for the short-term test,and VE3 was used as the extraction point for the long-term test. San <br /> Joaquin County Environmental Health Department(EHD)has received and reviewed Vapor <br /> Extraction Pilot Test Report(the report) dated December 30,2003 prepared by ATC Associates,Inc. <br /> (ATC). Vacuum pressure in the observation wells during the short-terra test was recorded at as high <br /> as 0.30 inches of water in VE3 and 0.0 inches of water in VE1,and for the long term test 2.7 inches <br /> of water was recorded in VE1 and 0.90 inches of water in VE2. ATC calculated a radius of.influence <br /> (ROI) of approximately 55 feet in VE3. Analytical results of two influent vapor samples collected <br /> from VE3 were 6.2 parts per million by volume (ppmv) and 3,200 ppmv of Total petroleum <br /> hydrocarbons as gasoline (IPH-g),and from VE2 the results were 18,000 and 21,000 ppmv of TPH- <br /> g. Based on the test results,ATC concluded that SVE is a viable remediation alternative for <br /> treatment of the contamination. ATC also recommended combining another remediation alternative <br /> such as air sparging or groundwater extraction with the SVE system in order to address the dissolved <br /> contamination. <br /> EHD agrees SVE is a feasible treatment alternative. A private drinking water well on site currently <br /> serves the property. Monitoring well MW-9 which has consistently reported concentrations of <br /> benzene at above 1 micrograms per liter,is located approximately 5 feet east of the private drinking <br /> well. Due to the close proximity of the contamination plume to the private drinking well,EHD <br /> recommends an interim remediation work plan be submitted to EHD that will begin reducing the <br /> contamination mass and establish hydraulic control to prevent potential contaminant impact to the <br /> private drinking well. Submit an interim remediation work plan to EHD by February 20,2004. <br /> Donna Heran,REHS,Director <br /> Environmental Health Division <br /> Jeffrey Wong, Senior REHS <br /> LOP/Site Mitigation Unit IV <br /> C: CRWQCB,Central Valley Region—James L.L.Barton,RG <br /> C: ATC and Associates,Inc.—Drew Van Allen <br />