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op <br /> • <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 • <br /> Telephone: (209) 838-9888 <br /> Facsimile: (209) 838-9883 <br /> APR 2 9 2002 <br /> April 22, 2002 C.' -, T _,tJ H <br /> Mr. Marty Hartzell <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, CA 95827-3098 <br /> Subject: Tony Gonzales Trucking, 1855 Jackson Avenue, Escalon, CA <br /> Results of Soil Vapor Extraction Test and Proposed Final Remediation Plan <br /> iDear Mr. Hartzell: <br /> On behalf of Vickie Mello Ground Zero Analysis, Inc. (Ground Zero) has prepared this letter report <br /> summarizing the results and conclusions of a soil vapor extraction test (VET) performed at the above <br /> referenced site and to propose a Final Remediation Plan for soil contamination documented at the <br /> property. <br /> The VET was completed to evaluate the feasibility of removing residual gasoline hydrocarbons from <br /> the subsurface near the former gasoline underground storage tank (UST) using soil vapor extraction. <br /> The testing was conducted in accordance with recommendations in our Problem Assessment Report <br /> dated May 14, 2001 and as directed in your letter dated June 20, 2001. The site location is shown on <br /> Figure 1. <br /> VAPOR TEST WELL CONSTRUCTION <br /> One single vapor test well and one dual completion vapor test well were installed at the site on <br /> November 27, 2001. Soil samples were collected at five-foot intervals during drilling to characterize <br /> subsurface stratigraphy and for possible laboratory analysis. Soils encountered beneath the site during <br /> drilling generally consisted of interbedded units of sand, silt and clay, which is consistent with the <br /> previous investigation. <br /> Q:l�ahVGR01-�7�lgowaRryu,u5V87[ip'f,Eoc <br />