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1 <br /> App/ied GeoSyslems/x - AW_ALAW <br /> AM <br /> A RESNA Company <br /> Environmental Solutions <br /> Through Applied Science, <br /> 1 3164 Gold Camp Dnve Suite 200 Engineering&Construction <br /> Rancho Cordova, CA 95670 <br /> Phone (916) 852-6690 <br /> FAX (916) 852-6688 <br /> C Civ <br /> February 10, 1992 <br /> 1 Mr Chuck Carmel <br /> ARCO Products Company <br /> P O Box 5811 <br /> San Mateo, California 94402 <br /> 1 Subject Vapor-Extraction Test Results, ARCO Station No 2130, 7906 North El <br /> Dorado Street, Stockton, California <br /> Mr Carmel <br /> Ile At the request of ARCO Products Companv, RESNA Industries (RESNA, formerly Applied <br /> GeoSystems) 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 /> conjunction with an ongoing environmental investigation at the site The site location is <br /> shown on the Site Vicinity Map, Plate 1 <br /> 1 <br /> BACKGROUND <br /> Subsurface investigations were performed at the site by RESNA in June 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 bonngs B1, B3, B5 and B7) are located north, south and <br /> 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 /> 1 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 was limited by design to a maximum length of 25 feet <br /> 1 <br /> 0109ccar <br /> 30003-5 <br />