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Geological Technics Inc. Page 3 35500 Welty Road, Vernalis,CA Report-Preliminary Environmental Site Assessment Project No.248.2 February 6, 1995 Consultants on February 22, 1991. This report mainly discussed extensive soils testing of the property to delineate areas where pesticide and fertilizer were spilled on the property. These spills, according to the report, were limited to the surface and shallow subsurface of the site. Groundwater was reported at approximately 25 feet with a gradient to the northeast. In addition, some UST's were removed from the site under the direction cf SJCPHSEHD. These UST's had leaked small amounts of hydrocarbons, but this has been mitigated and the tanks closed as of 1989. ■ The San Joaquin County Assessors office maintains a fairly detailed chain of title with regard the Welty Road Property. In addition, records of improvements made to the Property were also contained here. Most of the records from the Assessors office were provided by Homer J. Olsen, Inc. prior to the start of work at the Vernalis site. According to these records some of the lands past uses were: A) Prior to 1935 the Property was owned by Standard Oil of California which used it as a pumping station. B) The Property was then sold to A. R. Rennie who then subsequently sold easement rights to the Pacific Gas and Electric Company for the establishment of a natural gas pipeline along southern and western portions of the Property (it is unknown if the pipeline now exists or has ever existed). C) In 1947 ownership was transferred to the El Solyo Ranch Company who established a work camp that-later burned down in 1951. 2.2 Aerial Photograph Review An aerial photograph review was completed on January 4, 1995 at the San Joaquin County Engineering & Surveying Offices located at 1810 E. Hazelton in Stockton. Two maps, one from 1937 and one from 1952 were obtained (See Appendix E). The following is a summary of the aerial photograph review. + The 1937 map shows that on the Property, there are several structures. The Property was incorporated into a larger parcel to the south and east. There are several small uniform structures running parallel to Welty Road. To the east of the southernmost of these small buildings are five or six large cylindrical product storage tanks (presently the Enviropur-West property). To the north of the tank area are several small buildings and one fairly large rectangular building which could presumably be the former pumping station. The remaining land around the Property, with the exception of the northeastern and southwestern corner of the Welty