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• Treadwell&Rolb SITE ASSESSMENT REPORT 541 West Grant Line Road Tracy, California 1.0 INTRODUCTION This report presents the results of our environmental assessment for the subject property (Site) and surrounding properties (Figures I and 2) There is evidence of contamination from petroleum hydrocarbons in the soil and groundwater beneath the Site In a 3 July 2002 letter to Mr Tom Brenkwitz, the San Joaquin County Environmental Health Division (SJCEHD) suggests that the subsurface petroleum contamination may be the result of past activities at the ' Site rather than having migrated from the adjacent Chevron service station The SJCEHD based that opinion on information generated by Chevron and the preliminary subsurface investigation ' performed at the Site in August 2000 by Advanced GeoEnvironmental Inc The SJCEHD further ' . stated in their letter that because they could not attribute the contamination at the Site to an underground storage tank (UST) release, they would not be the regulatorya providing agency Y p g t he oversight for the continued investigation at the Site They then referred Mr Brenkwitz to the ' Regional Water Quality Control Board (RWQCB) for further directives ' 1.1 Purpose and Scope ' The purpose of this assessment was to compile available information on the Site and adjacent properties to assess whether the source of contamination may have been the result of past activities at the Site or if it may have migrated from an offsite source area Our scope of work included ' • Compiling and reviewing available documents from the City of Tracy and the SJCEHD, • Reviewing local, state, and federal government environmental databases, • Reviewing available aerial photographs of the area, 0' 0 Conducting interviews with individuals familiar with past activities at the Site and other sites of concern, Site Assessment Report l 21 May 2003 ' TREADWELL&ROLLO,INC