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LT4t <br /> L(: v <br /> A S S O C I A T E S I N C <br /> L <br /> Summary Report of <br /> LSoil and Groundwater Investigation <br /> Royal Oaks Pump Station <br /> Lf Royal Park Lane and Princess Drive <br /> Stockton, California <br /> ATC Project No. 54.62574.0006 <br /> L <br /> L1.0 INTRODUCTION <br /> ATC Associates Inc. has prepared this letter report on behalf of the City of Stockton Public <br /> LWorks Department to summarize soil and groundwater investigation at the City of Stockton <br /> Royal Oaks Pump Station (Figure 1). The purpose of the soil and groundwater investigation was <br /> to evaluate the vertical and horizontal extent of impacted soil and groundwater in the vicinity of <br /> Lthe former underground storage tank (UST), if any. This work was done at the request of San <br /> Joaquin County Public Health Services, Environmental Health Division (PHS/EHD). The findings <br /> of the subsurface investigative study are summarized in the following report. <br /> 1.1 Site Location <br /> The site is located on the south side of Princess Drive and the west side of Royal Park Lane in <br /> Stockton, California, as shown on Figure 1. The location is primarily a residential area with <br /> Dentoni Park located immediately west and south of the site. The site is currently occupied by the <br /> Royal Oaks Pump Station. <br /> 1_2 Background <br /> One 1,500-gallon diesel UST and all associated piping and dispensing equipment were removed <br /> and transported off-site on May 20, 1994. Laboratory analysis of a soil sample collected from <br /> beneath the former UST location indicated the presence of detectable concentrations total <br /> petroleum hydrocarbons. After the tank was removed, the area of the former tank was backfilled. <br /> The approximate location of the former UST is shown on Figure 2. <br /> 2.0 METHODS AND PROCEDURES <br /> To evaluate the extent of impacted soil and groundwater, three soli borings were advanced in the � <br /> vicinity of the former UST. All field activities were performed in accordance with ATC's <br /> Workplan for Soil and Groundwater Investigation at City of Stockton Royal Oak Pump Station, <br /> Royal Park Lane and Princess Drive, Stockton, California, dated April 7, 1999. This workplan <br /> was approved by PHS/EHD on April 12, 1999 with minor modifications. <br /> w:1163931reporlslsumi.doc 1 <br />