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r� mn'.ye LL' f�^���t� '# ��'� '�r`.,; sA.'c r• ` ,�i�` "" -Y'rF ��y� i �*,:,�: k<<, y i <br /> t <br /> �J t'�+i'� ��r;.`�"�f•IG1`:f� 7EE :•-Ij <br /> July 9, 1991 - <br /> ARCO Station No. 760, Lodz, California <br /> Wil samples from locations 2, 4, S, and 6, Ethylene dibromide and total lead were not <br /> detected in the Six soil samples. These result.: are presented in Tabic I. Because <br /> hydrocarbons were detected in soil sample S-3-PLl but not in soil sample S 3--PL5,res dual <br /> gasoline hydrocarbons may rapt be laterally extensive about (tic dispenser islands. <br /> On the basis of laboratory results of the six soil samples collected On lufy S, 1991,and the <br /> results of our previous work, Applied GeuSystems recommends that a vappr-extraction <br /> system be installed to remove resid,r 'rom the sail. Applied <br /> ;al gasoline hydracarbons <br /> CreoS}"sterns conducted dvapor-extraction test on lune 14,1991. Our initial esrimt tes of the <br /> effective radius of influence of 22 feet from Wch vapor-extraction well were rnsde using a <br /> vacuum of 30 inches of water column, a flow rate of 50 cubic feet per minute, an initial <br /> T'PHg concentration of 10,000m""grams per cubic Meter, and the duration of operation of <br /> Y� a vapor-extraction system of 12 months. Thus estimate 4f the radius of influence can be <br /> further defined as the Subsurfaee environmental investigation progresses, Thc: e location c and <br /> screened interval of subsequent vapor-extraction wells will be based on this refined data. <br /> Applied of <br /> remrs anon. des that vapor extraction can be a practical and cost effective <br /> method of soil rLmediation. <br /> On tl)c basis of ttte results of the vapor-extraction test and the environmental investigation <br /> 1- candrtcted at the site, a proposed layout of a vapz r-extracliart s}stem was prepared for <br /> ARCO. The proposed laeation of vapor-ex(raction wells and evaluated radius of influence <br /> are shown on the Proposed Remediation System, plate 4. <br /> At ARCO's request and wit" the appropriate permits from lite S)CPHS-EHD, Applied <br /> GeoSystcrns will install sixadditional 4-inch-di meter vapor-extraction edd <br /> locations shown on Plate 4 and install a thermal or Catalytic oxidizer to destroy wells at the proposed <br /> hydrocarbons removed from the soil, gasoline <br /> 07Nswh <br /> 3A616.8W <br /> 2 <br />