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GROUND ZERO ANALYSIS, INC. <br /> 02 HUAY 13 AM 11: 58 <br /> 1714 Main Street <br /> Escalon, California 95320 <br /> Telephone: (209)838-9888 <br /> Facsimile: (209) 838-9883 <br /> May 10, 2002 <br /> Mr. Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> 304 E. Weber Ave., Third Floor <br /> Stockton, CA 95202 <br /> Subject: Results of Subsurface Investigation, <br /> 11781 E. Comstock Road, Stockton, CA (Figure 1) <br /> Dear Mr. Knoll: <br /> s pleased to present the results of the subsurface <br /> Ground Zero Analysis, Inc. (Ground Zero) i <br /> investigation conducted at the subject site. <br /> INTRODUCTION <br /> The subject property is located at 11781 E. Comstock Road, <br /> eco Stockton, <br /> California, and <br /> is <br /> J of the <br /> residential. According Mr. Freud Kem v den 1981r The UST was located immediately east of <br /> underground storage tank (UST) <br /> a workshop and previously contained gasoline (Figure 2). No soil <br /> lisamples <br /> w er 3 collec <br /> San d at the <br /> time the e UST was removed. A signed statement m accordance Abandoned Tank Policy is included in <br /> County Environmental Health Department (EHD) <br /> Attachment A. <br /> FIELD METHODS <br /> Fieldwork was conducted in accordance with the Workplan f r Soil Boring <br /> rinoil boring tionper (Ground <br /> Zero, April 9, 2002) approved by EHD. Prior to initiating o <br /> its were <br /> obtained from EHD. All fieldwork was performed in <br /> on accordance <br /> file with EHD, the Ground Zero's Site <br /> Safety Plan and Quality Assurance/Quality Control Plan <br /> On May 1 2002, Fisch Environmental (C57-683865) advanced two <br /> Gregoil borings (SBI and S nCalifo2a <br /> under the supervision of field geologist Sean Garvey, and project manager g <br /> Registered Geologist. Boring SB1 was advanced to a depth BZ wpasoadvanced2t app 1 feet ox mately 16 <br /> low ground <br /> surface (bgs) within the former UST location, and boring <br /> feet bgs north of the former UST location. Fisch utilized a truck mounted Geoprobe 5400 direct <br /> \\GZA FS\SYS01\Data\GROUNDZE\KRETR\sumletter.doc <br />