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i(' VkTC <br /> t =, A S S O C I A T E S I N C <br /> SUMMARY REPORT <br /> SUPPLEMENTAL SUBSURFACE INVESTIGATION <br /> at <br /> SMITHS CANAL PUMPING PLANT <br /> 2144 FONTANA AVENUE <br /> STOCKTON, CALIFORNIA <br /> 1.0 INTRODUCTION <br /> 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 /> (UST) located at 2144 Fontana Avenue, Stockton, California. The purpose of the investigation <br /> was to install an additional monitoring well to evaluate the lateral extent of petroleum impacted <br /> soil and groundwater in the vicinity of the former underground storage tank (UST), <br /> downgradient of existing groundwater monitoring well MW3. In brief, the investigation <br /> consisted of drilling one soil boring and completing the boring as a well, collecting soil and <br /> groundwater samples, submitting the samples for laboratory analysis, and preparing this report. <br /> 1.1 Site Location <br /> ` i The site is located at the south end of Fontana Avenue adjacent to Smiths Canal in Stockton, <br /> California, as shown on Figure 1. The location is generally a residential area. The site is <br /> currently occupied by Smiths Canal Pumping Plant. <br /> 1_2 Site Background and Previous Work <br /> 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 /> -r active service. <br /> r, In May 1988, Ensco Environmental performed a limited investigation, advancing a single soil <br /> boring (B-1) beneath the northern (fill) side of the tank to a maximum depth of approximately 17 <br /> feet below grade. A soil sample collected from this boring at 17-17.5 feet below ground surface <br /> (bgs)recorded 130 parts per million (ppm)total petroleum hydrocarbons as diesel (TPHd). Results <br /> of soil sample analyses are summarized in Table 1. As a result of this initial investigation, the San <br /> Joaquin County Public Health Services Environmental Health Division(PHS/EHD)required further <br /> assessment of the extent of contamination at the subject site. <br /> w:IWordprol62574162574.021Reportslwcll_inslall.doc t <br />