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� y E <br /> ,.-•� _ III <br /> I <br /> MM, c � v,�,` .r k •S. <br /> J,, <br /> AUG 0 7 t?93 <br /> July 29, 1491 ENVIRONMEN�AI.kil=Al. <br /> ARCO Station No.760, Lodi, California <br /> samples from <br /> Analytical results indicated gasoline hydrarba olne hydrocar6ans werelno not n <br /> locations 1 and 3 (shown on Plate 3); however,g <br /> soil samples from locations 2A5 and b. Ethylene dibromidc and iota] lead were not <br /> detected in the six soil samples. These results are presented in Table 1. Because gasoline <br /> hydrocarbis were detected in soil sample S-3 PL1 but not soil sample S•3•P1.5, residual <br /> rally extensive about the dispenser islands.gasoline hydrocarbons may not is late <br /> On the basis of laboratory results of the six roil samples collected on July 5, 1991, and the <br /> k, Applied GeoSystems recommends that a vaper-extraction <br /> results of our previous wor <br /> system be installed to remove residual gasoline hydrocarbons from the soil. Applied <br /> vapor-extraction test on June 14.1991. Our initial estimates of the <br /> GeoSystems conducted aon well were .sem <br /> effective radius of influence of 22 feat from each <br /> of 50 cubic feet per minute, aninitial <br /> vacuum of 3i! inches of water column, a <br /> TPHo concentration of 10,E milligrams per cubic meter,and the duration of operation of <br /> a vaporextraction system of 12 mon,ns. ce can be <br /> This estimate of the radius of influen <br /> E further defined as the subsurface environmental investigation progresses. The location and <br /> -extraction wels wl be based on this refined data. <br /> screened interval msvapor <br /> cont that vapor extr ct on!c nilbe a practical and cost effective <br /> concludes <br /> Applied GeOSysts <br /> method of soil remediation. <br /> On the basis of the results of the vaporextraction test and the environmental investigation <br /> conducted at the site, a proposed layout of a vaporextratition system was prepared for <br /> ARCO. The props-sed location af.vaporextraction wells and evaluated radins of dente <br /> are.slkoian'an the,Proposed, �n our June' inital!W <br /> iatioe 1941 Add ndum to Work lPlan fols will r subsurface; <br /> untg fceld metltrsds desert <br /> roes ippon iDrilling will be terminated at either 5 feet below the last subjective evidence <br /> of hydrocarbons or at 55 feet, whichever is deeper. <br /> ;., <br /> At ARWI regt4Mst and with the approval of the attached permit from the SJCP <br /> Applied(3eoSyelemswill install six additional 4-inch-diameter vapoextractionwells wells aat t Iliae <br /> : <br /> r <br /> i the <br /> ielatiashown on Plate eu � aSitdu <br /> propofor publicreview ha a been submittedand <br /> after the appropriate documents required <br /> approved, We intend to install a thermal or catalytic oxidizer to destroy gasoline <br /> hydrocarbons removed from the sail, <br /> , <br /> ' F <br /> E 070%Ch 2 <br /> 1 <br /> `i <br /> R <br /> p <br /> i <br /> 3 <br /> s <br />