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LL , <br /> a <br /> m�ny aro rsiwrrr. ___- - <br /> ARFSNACompany <br /> Environmental Solutions <br /> Through Applied Science, <br /> Rawho <br /> 164 Grid Camp Drive.)3 ?041 Engineering A Construction <br /> nc hn Cordova,C'.\ i0;70 0 <br /> Phone 1416)852-6040 <br /> FAX(41611152-66811 <br /> February 10, 1992 <br /> Mr. Chuck Carmel I <br /> ARCO Products Company <br /> P.O. Box 5811 <br /> San Mateo, California 94402 <br /> ` Subject: Vapor-Extraction Test Results, ARCO Station No. 2130, 7906 North El <br /> Dorado Street, Stockton, California. <br /> Mr. Carmel: <br /> 5 <br /> At the request of ARCO Products Company,RESNA Industries(RESNA,formerly Applied <br /> GeoSvstems) has prepared this letter report summarizing the results and conclusions of a <br /> vapor-extraction test (VET) performed at the subject site. This VET was performed in <br /> a conjunction with an ongoing environmental investigation at the site. The site location is <br /> shown on the Site Vicinity Map, Plate 1. <br /> C) <br /> BACKGROUND <br /> Subsurface investigations were performed at the site by RESNA in.lune and December of <br /> 1991 (RESNA, report in preparation). The results of these investigations revealed the <br /> presence of residual hydrocarbons in vadose zone soil at concentrations greater than 100 <br /> parts per million at depths ranging from 15 to 56 feet below surface grade (bsg). Residual <br /> ! hydrocarbons in soil (detected in borings Bl, B3, B5 and 137) are located north.south and <br /> f west of the existing tanks. Vapor-extraction wells VW-1, VW-3, and VW-4 installed in <br /> borings B3, B5, and B7 were screened at depths ranging from 40 to 65 feet bsg. Because <br /> excessive screen length compromises the ability to extract hydrocarbons from the bottom of <br /> a vapor-extraction well (due to a vacuum decrease with depth within the well),the screened <br /> zone at each well site vias limited by design to a maximum length of 25 feet. <br /> =9ccrr <br /> 30003-5 <br />