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SMITH ENVIRONMENTAL TE TEL : 1,.209-579-2105 13,25 No .001 P ,O <br /> ] 17UG G(api)i05 Drive <br /> fir► Modulo, Califorllie <br /> 95351 <br /> 209,579.2221 <br /> i; FOX 208,679.2226 <br /> AS SO C I ATE S IN C . <br /> f <br /> Il <br /> September.18, 1998 <br /> { <br /> 13099 ENVIRONMENTAL HEALTH DIVISION <br /> 304 E. WeberlAve.Third Floor <br /> R O. Box 388,'Sto kton CA 9520170388 <br /> Approved <br /> Denied '' ❑ " <br /> At.Harlin Knoll II v'2 CoS'1`J <br /> Conditions <br /> San Joaquin County Public Health <br /> Services,Environmental Health Division X D e 5W rR I <br /> Date � /? <br /> 304 B. Weber Street, Third Floor <br /> Stockton, CA 95262, Ij <br /> Subject: Workplan for Additional Subsurface Investigation at Ripon Unified School <br /> District,304 North Acacia Avenue, Ripon, California <br /> li. <br /> Dear Mr. Knoll: <br /> j <br /> ATC Associates Inc. has prepared this workplan, on behalf of Ripon Unified School District for <br /> the performance of an additional subsurface investigation at the above referenced site. The <br /> purpose of the additional subsurface investigation is to try ind determine the vertical and <br /> horizontal extent of impacted soil and groundwater in the vicinity' boring SB6 which was <br /> completed April 23, 1498. This work being done at the direction of San Joaquin County Public <br /> Health Services Environmental Health Division (PHS/ERD). '[The proposed scope of work, <br /> preparing a soil boring permit, advancing up to six soil borings,,soil and groundwater sampling, <br /> laboratory analysis of selected soil and groundwater samples, and preparing a summary report. <br /> The scope of work is described in detail in the following paragraphs. <br /> I� <br /> SITE LOCATION j <br /> 3 <br /> i, <br /> The site is located on the east side of North Acacia Avenue and the north side of Pine Street, <br /> Ripon, California, as shown on Figure 1. The location is a residintiat and commercial area. The <br /> site is currently occupied by Ripon Unified School District, 'I <br /> BACKGROUND k <br /> i, <br /> In February, 1941, one 500-gallon UST of unknown fuel was removed; in August, 1991, one <br /> 550-gallon unleadedin <br /> asol a UST was removed; in Qctober, 1991 47 feet of single w i <br /> 81 all piping <br /> was removed; and, in December, 1991, one 7,500-gallon unleaded gasoline UST was removed. } <br /> Laboratory analysis of soil samples collected from beneath the fc 6rn USTs and piping locations <br /> indicated the presence of detectable concentrations of total petroleum hydrocarbons. <br /> Discoloration of soil and a petroleum hydrocarbon odor were noted in the field. After the tanks <br /> were removed,the areas of the former tanks were backfilled. <br /> vru3o9F�ponr�v►7tp3.aoe 1 ' <br />