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1260 Graphics Drive <br /> y Modesto, California <br /> :4 F 95351 <br /> 209.579.2221 <br /> Fax 209.579.2225 <br /> A S S O C I A T E S I N C . <br /> September.18, 1,998 <br /> 13099 <br /> Mr. Harlin Knoll <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 Ripon Unified School <br /> District, 304 North Acacia Avenue, Ripon, California <br /> Dear Mr. Knoll: <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 and determine the vertical and <br /> r horizontal extent of impacted soil and groundwater in the vicinity boring SBS which was <br /> completed April 23, 1998. This work being done at the direction of San Joaquin County Public <br /> Health Services Environmental Health Division (PHS/EHD). The proposed scope of work, <br /> f 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 /> SITE LOCATION <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 residential and commercial area. The <br /> site is currently occupied by Ripon Unified School District. <br /> BACKGROUND <br /> In February, 1991, one 500-gallon UST of unknown fuel was removed; in August, .1991, one <br /> 550-gallon unleaded gasoline UST was removed; in October, 1991; 47 feet of single wall 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 former 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 /> wA130991reportslw1cp2.doc 1 <br />