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I <br /> -� 1117 Lone Palm Avenue, Suite B <br /> f v Modesto, California 95351 <br /> www.atc-enviro.com <br /> 209.579.2221 <br /> Fax 209.579.2225 <br /> �I <br /> A S S O C I A T E S I N C <br /> May 9, 2001 <br /> 54.14981.0001 j <br /> -c <br /> Ms. Margaret Lagorio CP <br /> San Joaquin County Public Health <br /> Services, Environmental Health Division <br /> 304 E. Weber Street, Third Floor <br /> Stockton, CA 95202 <br /> I <br /> Subject: Workplan for Additional Subsurface Investigation at N&S Irrigation, 215 West <br /> Main Street, Ripon, California <br /> Dear Ms. Lagorio: <br /> i <br /> ATC Associates Inc. has prepared this workplan, on behalf ofN&S Irrigation for the performance <br /> of an 'additional subsurface investigation at the above referenced site. The purpose of the <br /> subsurface investigation is to evaluate the vertical and horizontal extent of impacted soil and <br /> groundwater in the vicinity of the former underground storage tanks (USTs). This work being <br /> done at the direction of San Joaquin County Public Health Services Environmental Health <br /> Division (PHS/EHD) in their correspondence dated January 26, 2001. <br /> In brief, the scope of work for site characterization activities will include advancing. one cone <br /> penetrometer (CPT) boring and six Geoprobe soil borings; analysis of selected soil and <br /> groundwater samples; performing a well survey; and preparing an investigation report detailing <br /> site activities. <br /> SITE LOCATION <br /> I <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 1. 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 of total <br /> i <br /> wA14981\reports\wkp3.doc 1 <br />