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A. 1117 Lone Palm Avenue, Suite B <br /> Modesto, Cali#ornia 95351 <br /> www.atc-enviro.com <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 12, 2000 ,, <br /> 17292.0002 rv=u <br /> Mr. Jeff WongW=.;. _ <br /> R3 C-)r , <br /> San Joaquin County Public Health Services <br /> Environmental Health Division C:) ` <br /> 304 E. Weber.Street,Third Floor <br /> Stockton, California 95202 <br /> Subject: Workplan for Supplemental. Subsurface investigation at Stagg High School, 1.621 <br /> Brookside Road, Stockton, California <br /> Dear Mr. Wong: <br /> ATC Associates Inc. has prepared this workplan, on behalf of Stockton Unified School District <br /> (SUSD) for the performance of subsurface investigation activities-at Stagg High School, 1621 <br /> Brookside Road, Stockton, California (Figure 1). The purpose of the subsurface investigation is <br /> to evaluate the vertical and horizontal extent of petroleum impacted soil andgroundwater in the <br /> vicinity of the former underground storage tank(UST). This work being done at the direction of <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) in <br /> correspondence dated July 21, 2000: <br /> The scope of work includes obtaining permits, advancing five soil borings and collecting soil and <br /> groundwater samples, laboratory analysis of selected soil and groundwater samples, and preparing <br /> a summary report. The scope of work is described in detail in the following paragraphs. <br /> The site is located on the north side Brookside Avenue and the east. side of McGaw Street, <br /> Stockton California, as shown on Figure 1. Stagg High School currently occupies the site. <br /> Back-around <br /> In December 1990, one 500-gallon unleaded gasoline underground storage tank (UST) and all <br /> associated piping and dispensing equipment was removed and disposed of. Laboratory analysis of <br /> a soil sample collected from beneath the former UST location indicated the presence of detectable <br /> concentrations total petroleum hydrocarbons. .After the tank was removed, the area of the former <br /> tank was backfilled. <br /> On August 14 and 15, 1997, four soil borings to 25 feet below ground surface (bgs) were <br /> advanced. The soil borings were advanced using a truck mounted Geoprobe® narrow diameter <br /> rig employing direct push technology. Soil samples were submitted for analysis and samples from <br /> wA17292.0002 \.�tp.aoc 1 <br />