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3.0 PREVIOUS ASSESSMENTS <br /> Previous environmental site assessments, including a modified Phase I and a <br /> preliminary Phase II site assessment, were conducted by GTI at the property during 1994 and <br /> 1995 The results of these assessments are described in the GTI's report entitled Preliminary <br /> Environmental Site Assessment Report dated February 6, 1995 <br /> The purpose of the Phase I assessment was to evaluate potential nearby off-site <br /> sources of environmental concern, as well as to delineate areas of recognized environmental <br /> concern present on the property The information obtained during the Phase I assessment was <br /> used to designate soil boring locations during the Phase II work The assessment consisted of a <br /> records review, an aerial photograph review, site reconnaissance, and interviews with people <br /> having information on previous land use <br /> • GTI's aerial photograph review revealed the presence of the former pump station <br /> and associated facilities, as well as the presence of a former vehicle maintenance pit having a <br /> concrete pad Aerial photographs from 1937 showed that the former pump station was located <br /> within the eastern portion of the property and adjacent to the`south property boundary Several <br /> small uniform structures were present adjacent to Welty Road Several aboveground storage <br /> tanks were present to the south of the pumping station Currently, only two tanks are present to <br /> the south of the property at the Enviropur-West facility <br /> GTI's on-site reconnaissance showed that no existing structures associated with <br /> the pump station were present However, remnants of building foundations containing piping, <br /> rebar, and other debris were present The foundation of the presumed pump house of the pump <br /> station and two pipelines were located during GTI's reconnaissance The pipelines were <br /> observed along the edge of the presumed pump house foundation One line was exposed along <br /> the northern margin of the foundation and the other was exposed along the western margin of the <br /> . foundation A large maintenance pit was observed by GTI at the property The pit was <br /> Preliminary Site Investigation Work Plan-Draft lune 30, 1998 <br /> Roberts Property(Former Vernalis Pump Station) <br /> Vernalis California <br /> 5 <br />