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- — <br /> • <br /> �. PF"', 77 <br /> WE- <br /> r: <br /> �( <br /> January X18, 2000 <br /> f <br /> Mr. Joe Aldridge <br /> thltrainar�Iric.; <br /> 525 West T#iird Street <br /> Hanford, Califorlia 931230 <br /> Subject: Vapor Extraction/Air Sparge.Test Report <br /> Be con-S ation: 4'74 <br /> � <br /> 34"40 Easi»Main Street,Stockton, California <br /> Mr. Aldridge: <br /> At the request of Ultramar Inc. (Ultramar); Horizon Environmental Inc. (Horizon) has <br /> m <br /> prepared this report suman2ing the results of a soil vapor extraction test (VET) and an air <br /> sparge test (AST) performed at the subject site (Figure 1, Site Vicinity Map). These tests <br /> were .performed to evaluate soil- and.groundwater remediation alternatives for the subject <br /> property. The site is an.operating gasoline service station located on the southwestern corner <br /> of the intersection of East Nfain Street and Broadway in Stockton, California. Site facilities <br /> . include a station building, two gasoline product dispenser islands located north of the station <br /> building, and three underground gasoline storage tanks (USTs) located toward the eastern <br /> property boundary. Locations of these and other pertinent site features are shown on the Site <br /> Plan(Figure 2). <br /> VAPOR EXTRACTION" TEST PR'OCEDURES <br /> Pnor .to initiating testing, H"orizon 40l pilot test notification form to the San Joaquin <br /> Valley Air Pollution ContraID'istr�et. LVET con0_4s& vapor extraction from wells <br /> VW 2.(screened from 37' to below surface rade } and VW-1 (screened from 50' to <br /> 65' bgs), monitoring the extraction flo:wrate and _V, <br /> vacuum, temperature and <br /> pressure, and monitoring wells VW-4, VW-5 and VW-7 for vacuum response. In addition, a <br /> Horiba hydrocarbon vapor analyzer was used to measure the hydrocarbon concentration of <br /> the soil vapor.. <br /> The VET was performed on December 9, 1999. A two-horsepower Rotron regenerative <br /> blower was used to establish a well vacuum and initiate flow. The blower was piped to a <br /> manifold equipped with a dilution valve, pitot tube, pressure and temperature gauges and a <br />? sample port. Extracted soil gas was routed through one-200 pound activated carbon unit for <br /> k <br /> treatment. Flow was initially established at 39 standard cubic feet per minute scfrti) at a <br /> vacuum of 22 inches of water column. Approximately 1.5 hours into the test, a vacuum leak <br /> ;. associated with a caml'ock fitting was detected and corrected. As a result, flowrate, vacuum <br /> � ..• and hydrocarbon field screen data obtained between 9.30 AM and 10:45 AM are considered <br /> 501] Golden Foothiii per Suite 7 . EIDorado Huls CA 957G2.:• <br /> 1. . `(916)939 217i�'• FAX' 9]6)9392172; <br /> fE. f'O.,Boxd5283: <br /> "Plat G�l�� ,93388 V, {805)�589�8389 • ` AFX' � � <br /> x �, nt (805).b89 lfb, <br />