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C- A <br /> � <br /> R A S S O C I A T E S I N C <br /> �f <br /> SUMMARY REPORT <br /> SUBSURFACE INVESTIGATION <br /> at <br /> J SMITHS CANAL PUMPING PLANT <br /> 2144 FONTANA AVENUE <br /> STOCKTON, CALIFORNIA <br /> 1.0 INTRODUCTION <br /> 1 This report summarizes procedures and practices utilized by ATC Associates Inc. to investigate <br /> petroleum-impacted soil and groundwater associated with the former underground storage tank <br /> F (UST) located at 2144 Fontana Avenue, Stockton, California. Previous investigations have } <br /> _- <br /> shown that free product was present in the subsurface in the vicinity of monitoring well MW-4. <br /> The purpose of this investigation was to evaluate current subsurface conditions and determine the <br /> amount of free product, if any, in the vicinity of well MW-4. In brief, the investigation consisted <br /> of drilling three soil borings, collecting soil and groundwater samples, submitting the samples for <br /> s- laboratory analysis, grouting the borings, and preparing this report. <br /> ,1 1_1 Site Location <br /> The site is located at the south end of Fontana Avenue adjacent to Smiths Canal in Stockton, <br /> F-- <br /> California, as shown on Figure 1. The location is generally a residential area. The site is currently <br /> occupied by Smiths Canal Pumping Plant. <br /> :=a <br /> 1.2 Site Background and Previous Work <br /> t An estimated 1,100-gallons of diesel fuel was reportedly leaked from the above referenced 5,000- <br /> gallon fiberglass tank as a result of an inadvertent puncture. The tank was repaired and returned to <br /> active service. <br /> In May 1988, Ensco Environmental performed a limited investigation, advancing a single soil boring <br /> (B-1) beneath the northern(fill) side of the tank to a maximum depth of approximately 17 feet below <br /> grade. A soil sample collected from this boring at 17-17.5 feet below ground surface (bgs) recorded <br /> 130 parts per million (ppm) total petroleum hydrocarbons as diesel (TPHd). Results of soil sample <br /> '-' analyses are summarized in Table 1. As a result of this initial investigation, the San Joaquin County <br /> -:, Public Health Services Environmental Health Division (PHS/EHD) required further assessment of the <br /> extent of contamination at the subject site. <br /> f w:1149811149811reportslpsi.doc 1 <br /> �t� <br />