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CVAIPalm 1117 Lone Avenue <br /> Suite B <br /> Modesto, CA 95351 <br /> 209.579.2221 <br /> Fax 209.579.2225 <br /> A S S 0 C I A T E S I N C <br /> July 9, 1999 CEIVED <br /> 13099 <br /> JUL 12 1999 <br /> cNV11RONMENTAL I-IEALTH <br /> Mr. Harlin Knoll ENViRONNPO 1'4AV4&q N <br /> San Joaquin County Public Health 304 E. Weber Ave.Third Floor <br /> P. O. Box 388, Stockton CA 95201-0388 <br /> Services, Environmental Health Division Approved <br /> 304 E. Weber Street, Third Floor Denied <br /> Stockton, CA 95202 Conditions at", 6(c1 "PPS <br /> Subject: Workplan for Additional Subsurt` b of <br /> District, 304 North Acacia Avenue, Ripon, California <br /> Dear Mr. Knoll: <br /> ATC Associates Inc. has prepared this workplan, on behalf Ripon Unified School District, for the <br /> performance of additional subsurface investigation activities at the above referenced site. The <br /> purpose of the subsurface investigation is to evaluate the horizontal extent of petroleum impacted <br /> soil and groundwater south and southwest of the former underground storage tanks (USTs). This <br /> work being done at the direction of San Joaquin County Public Health Services Environmental <br /> Health Division (PHS/EHD). <br /> The scope of work includes obtaining permits, advancing two soil borings and collecting soil <br /> samples, installing two groundwater monitoring wells, developing and sampling the wells, <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 type 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 /> w:1130991repor1slwkpwe1ii.doc I <br />