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Working To Restore Nature <br /> PHASE H PROBLEM ASSESSMENT REPORT <br /> at <br /> F= Smith's Canal Pumping Plant <br /> 2144 Fontana Avenue <br /> Stockton, California <br /> 1.0 INTRODUCTION <br /> This report is being submitted at the request of San Joaquin County Public Health Services, <br /> v Environmental Health Division (PHS/EHD) to summarize field activities associated with <br /> additional investigation of soil and groundwater contamination at the City of Stockton (City) <br /> Smith Canal Pumping Station located on Fontana Avenue in Stockton, California (Figure 1). <br /> =' The site was formerly occupied by a Waste Water Treatment Plant which maintained a 5,000- <br /> gallon underground (u/g) diesel storage tank for use by auxiliary power generators (Figure 2). <br /> r--. <br /> t <br /> 2.0 BACKGROUND <br /> rr. An estimated 1 100- allons of diesel fuel was reportedly leaked from the above referenced <br /> s>> g P Y , <br /> 5,000-gallon fiberglass tank as a result of an inadvertent puncture. The tank was repaired and <br /> returned to active service. <br /> I.J In May 1988, Ensco Environmental performed a limited investigation, advancing a single soil <br /> boring (13-1) beneath the northern (fill) side of the tank to a maximum depth of approximately <br /> 17 feet belowgrade. A soil sample collected from this boring at 17-17.5 feet below ground s <br /> surface recorded 130 parts per million (ppm) total petroleum hydrocarbons as diesel (TPHd). <br /> Results of soil sample analyses are summarized in Table 1. As a result of this initial <br /> investigation, the PHS/EHD required further assessment of the extent of contamination at the <br /> subject site. <br /> REPORT51PAR1093.FNL 1 <br />