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SMTH <br /> ENVIRONMENTAL TECHNOLOGIES CORPORATION <br /> October 29, 1997 <br /> 14981 <br /> Ms. Mary iVMeays <br /> 'San Joaquin County Public Health <br /> Services, Environmental Health Division <br /> -304 E. Weber Street, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Workplan for Subsurface Investigation at N&S Irrigation, 215 West Main Street, <br /> Ripon, California <br /> Dear Ms. Meays: <br /> Smith Technology Corporation (acquired by ATC Associates) has prepared this workplan, on <br /> behalf of N&S Irrigation for the performance of a subsurface investigation at the above referenced <br /> site. The purpose of the subsurface investigation is.to determine the vertical and horizontal extent <br /> of soil and groundwater contamination, if any, in the vicinity of the former underground storage <br /> tanks (USTs). This work being done at the direction of San Joaquin County Public Health <br /> Services Environmental Health Division (PHS/EHD). The proposed scope of work includes <br /> obtaining permits, advancing two soil borings, soil and groundwater sampling, laboratory analysis <br /> of selected soil and groundwater samples, and preparing a summary report. The scope of work is <br /> described in detail in the following paragraphs. <br /> SITE LOCATION <br /> The site is located on the north side of West Main Street and the east side of Locust Avenue, <br /> Ripon, California, as shown on Figure I. The location is a residential and commercial area. The <br /> site is currently occupied by N&S Irrigation. <br /> BACKGROUND <br /> In March 1990, one 1,500-gallon unleaded gasoline underground storage tank (UST), one <br /> unleaded gasoline UST of unknown size, and all associated piping and dispensing equipment were <br /> removed and transported off-site. Laboratory analysis of soil samples collected from beneath the <br /> former 1,500-gallon UST location indicated the presence of detectable concentrations total <br /> petroleum hydrocarbons. Discoloration of the soil and a petroleum hydrocarbon odor were noted <br /> in the field. After the tanks were removed, the areas of the former tanks were backfilled. <br /> w:\14981\reports\wkp.doc 1 <br /> 1260 Graphics Drive Modesto,CA 95351-1502 (209)579-2221 Fax(209)579-2225 <br /> Engineering Consulting Remediation • Construction <br />