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ATC Associates Inc. <br /> 1117 Lone Palm Avenue, Suite 201 <br /> V %TC Modesto,California 95351 <br /> 0V 209-579-222I <br /> AS SO c I ATE s i w c. Fax:209-579-2225 <br /> Case Closure Report <br /> Diesel Performance <br /> LM 2804 East Fremont Street <br /> Stockton, California <br /> W <br /> 1.0 INTRODUCTION <br /> L+ ATC Associates Inc. (ATC) has prepared this Case Closure Report on behalf of Diesel Performance to <br /> address the requirements for environmental site closure of the property Iocated at 2804 East Fremont <br /> Street in Stockton, California, Figures 1 and 2. This report is being submitted to the San Joaquin County <br /> Environmental Health Department(SJCEHD)to satisfy the No Further Action Required (NFAR)criteria. <br /> The information provided addresses closure requirements outlined in Appendix A to the Tri-Regional <br /> Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites. <br /> 1.1 Site Location <br /> The site is located on the south side of Fremont Street and east of Filbert Street in Stockton,California, as <br /> shown on Figures 1 and 2 and consists of an approximately two and one-half acre parcel. The location <br /> consists of mixed-use residential properties, retail and commercial properties, and light industrial <br /> s properties. The site is currently occupied by Diesel Performance, a diesel truck service and repair <br /> business. According to information obtained from the San Joaquin County Assessor's Office,the property <br /> �'" is identified as Assessor's Parcel Number (APN) 143-430-01. The site is located at an approximate <br /> elevation of 25 feet above sea level. <br /> Ido 1.2 Historical Environmental Work <br /> ' In February 1987, SEMCO removed and disposed of one 3,000-gallon underground storage tank (UST), <br /> associated piping, and fuel dispenser used to store and dispense unleaded gasoline, at the location shown <br /> on Figure 3. A soil sample collected from 13 feet below ground surface (bgs) contained elevated <br /> concentrations of petroleum hydrocarbon contaminants. The excavation was subsequently backfilled and <br /> resurfaced. <br /> Lo <br /> On July 23, 1997, an ATC geologist supervised the advancement of five direct-push soil borings (S131 <br /> through S135) ranging in depth from 6 to 46 feet bgs. Petroleum hydrocarbons were detected in soil <br /> samples submitted for laboratory analyses from S133. Site activities are summarized in ATC's Summary <br /> Report for Subsurface Investigation,dated October 20, 1997. <br /> From September 25 to 28, 1998, ATC personnel supervised the advancement of soil boring to a depth of <br /> approximately 65 feet bgs. This boring was completed as groundwater monitoring well MW1. <br /> Analytical data indicated that soil and groundwater samples contained detectable concentrations of <br /> petroleum hydrocarbons. Field activities and analytical results are detailed in ATC's Summary Report of <br /> Additional Subsurface Investigation, dated January 8, 1999. <br /> S:Environmenta11625771Reports12010 closure summary.doc 1 <br /> 1.. <br /> t <br /> V <br />