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5 <br /> A 5 5 0 C T A T E S I N C . <br /> F <br /> Summary Re iort of <br /> Subsurface Investigation <br /> Edison High Sc-tool <br /> F1425 South Centei Street <br /> Stockton, California <br /> F <br /> ATC Project No. 17 92.0003 <br /> 1.0 INTRODUCTION <br /> ATC Associates Inc. has prepared this report on b half of Stockton Unified School District <br /> (SUSD) to summarize findings of a subsurface investigation performed at Edison High School, <br /> 1425 South Center Street, Stockton, California -(Fi ure 1). The purpose of the subsurface <br /> investigation was to evaluate the depth to which diesel range hydrocarbons have migrated <br /> F beneath a concrete cradle on which the site's former 1 ,000-gallon diesel tank was resting. This <br /> work was performed at the request of San Joaquin County Public Health Services, Environmental <br /> Health Division (PHS/EHD). The findings of the sub5 urface investigative study are summarized <br /> F� in the following paragraphs. <br /> 1.1 Site Location <br /> F." <br /> The site is located south of Charter Road, between the French Camp Turnpike to the west and <br /> Center Street to the east, in Stockton, California ass own on Figures 1 and 2. The location is <br /> primarily commercial. <br /> 1.2 Background <br /> F i <br /> On November 1990, one 10,000-gallon diesel underground storage tank (UST) and its associated <br /> piping were removed. Laboratory analysis indicated that four of the five soil samples collected <br /> F! from beneath the former UST location contained detectable concentrations of diesel range <br /> petroleum hydrocarbons. After the tank was removed, the area of the former tank was backfilled. <br /> Soil sample locations are shown on Figure 3. <br /> Based on the above findings, PHS/EHD requested additional work at the subject site. <br /> P Helmick and Lerner Inc. subsequently submitted work plan titled Work Plan or Soil <br /> q Y p f <br /> Investigation, Edison High School - Stockton Unified School District dated February 6, 1998. <br /> I The work plan purposed methods and procedures o evaluate the vertical "extent to which <br /> petroleum hydrocarbons have migrated into native 3oil. This work plan was approved by <br /> PHS/EHD, in correspondence dated March 25, 1998. Laboratory results are summarized in <br /> F <br /> wA 172921reportslsumwe1.doc 1 <br />