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1.0 INTRODUCTION Tetra Tech EM Inc. (TtEMI)was contracted by Ms. Dorothy Sandberg(p,roperty owner)to conduct a phase 11 subsurface soil investigation located at 4950 Bonham Street, Linden, California. Two petroleum E underground storage tanks were removed from the property on May, 1, 1998. Based on observations during the tank removal activities by the Public Health Services Environmental Health Division(PHS- ; !I EHD)- San Joaquin County and laboratory analytical results from soil samples collected in the !1 c excavation, the PHS-EHD requested further subsurface soil investigation.to determine the horizontal and vertical extent of petroleum hydrocarbon impact. , K This site assessment report resents and summarizes the results of the sub'surfacc investigation p P g on which took place on November 12, 1998. Personnel present during the inivestigastion included: Dr. Jill Slater General Atomics); Regina M. Boyle Law Office of Regina M. Boyle); Margaret La orio PHS-EHD r and Greg Alyanakian (TtEMI). A copy of the laboratory analytical' results is provided in Appendix A, copies of the boringlogs and field notes are provided in Appendix x B, and copies of the approved boring + permit application and work plan are provided in Appendix C. F 2.0 SITE DESCRIPTIONjf This section describes the site location and description, site history and contaminants, and site geology. 2.1 Site Location and Description !i The site is located at 4950 Bonham Street, Linden, California(Figure 1). The site lies within San i� Joaquin County and,therefore, falls under the jurisdiction of the PHS-EHD - San Joaquin County. The i ` site is bounded by Bonham Street to the west and Highway 26 to the south. Currently, the site is developed with paved parking area and a single story building containingprofessional offices. i 1 f Il I }