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ENVIRONMENTAL HEALTH DIVISION <br /> 304 E.Weber Ave.Third Floor <br /> R O. Box 388, Stoc on CA 95201-0388 <br /> Approved <br /> Denied ❑ <br /> Conditions <br /> Oate (p•3,t 1� by <br /> ' 1260 Graphics Drive <br /> A Modesto,California <br /> 95351 <br /> 209.579.2221 <br /> Fax.209.579.2225 <br /> C )4��631Z ASSOCIATES INC. <br /> Fl"JAivP.E// df <br /> I�nAJ -til,I Gv, <br /> F-7 <br /> April 30,1998 1 <br /> I7ti.t.tJ vv 14981 ' \ <br /> 17Hf 01 i998 - <br /> VV I IY�ti�D�`� I Mr.Ron Rowe - TE:,-r: <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 Additional Subsurface Investigation at N&S Irrigation,215 West <br /> Main Street,Ripon,California <br /> r y�i <br /> Dear Mr.Rowe: <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 determine 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 March 10, 1998. The proposed scope of <br /> work includes obtaining permits, advancing three soil borings, soil and groundwater sampling, <br /> laboratory analysis of selected soil and groundwater samples, and preparing a summary report. <br /> 1 L� The scope of work is described in detail in the following paragraphs. <br /> SM LOCATION <br /> The site is located on the north side of West Main Street and the east side of Locust Avenue, <br /> p,I 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 /> Wn 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 /> n petroleum hydrocarbons. Discoloration of the soil and a petroleum hydrocarbon odor were noted <br /> / V t D ( r _ in the field. After the tanks were removed,the areas of the former tanks were backfilled. <br /> C/ („�1• (,� x-U498IVcpansh*kpJd= <br /> C <br /> i <br />