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'i <br /> 1 <br /> August 5, 1991 California ------ <br /> ARCO Station No. 6144. 'tracy, ---r—� <br /> 0 of seven 8-inch-diameter soil borings onsite. Tile locations <br /> o Observe drilling s are shown on Prate�• The borings will be,terminated ed <br /> of the proposed baring <br /> when phofoionization detector(PID)readings of less tha*114 parts p <br /> by volume are oUtained in twoapproximately <br /> rconsecutive <br /> x matelye54a feet sbelowe surface agrade, <br /> 0 borings will be terminate pp of <br /> Additionally, we propose to observe oca drillii so Iriseneededs 1f furt er <br /> evaluation of the lateral extent of by <br /> roximately <br /> o Observe drilling 54 <br /> of eight 14-inch-diameter soil borings to app vapor- <br /> feet feet near and through boh ngs as shown on the Schematic tWell Design, Plate <br /> extraction wells in <br /> 3. The screened interval of t e Nusinells will <br /> theextend <br /> FID in the borings below <br /> aroundgrade <br /> the <br /> hydrocarbons are not detect g in <br /> existing tank cavity. If hydrocarbons are ei stw will beoadjusted accordingly. <br /> screened interval and depth of the vapor <br /> analyses at <br /> from the ground The <br /> o Collect undis`Srbed soil samples for classification and laboratory <br /> surface to the total depth of the boring. <br /> afootinterva <br /> r soil samples will be cication system.sing visual and manual methods according o <br /> the Unified Soil Cl:asslf <br /> o Collect four soil samples from the drill cuttings to be COMP <br /> osiied into one <br /> sample at the laboratory for evaluation of disposal Options' <br /> Submit three soil samples from each boring and the composite sample to a <br /> ° the Slate of California for analysis of total pe.roleum <br /> laboratory certii ed by b modified Environmental Protection <br /> hydrocarbons as gasoline (Z pHg) y a"d total <br /> Agency (EPA) Method $415 and benzene, <br /> ethod 8G24u In toluene, <br /> the soil ample <br /> Xylene isomers (STEX) by EPA organic <br /> lead for <br /> ® collected from the drill cuttings will be analyzed for <br /> evaluation of disposal options. <br /> ID <br /> i <br /> 0619ccar 3 <br /> 30041-2W <br />