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Phase I Environmental Site Assessment Proposed Mountain House Preschool and Multi-Purpose Buildings 54 West Conejo Court,Mountain House,CA Page 9 6.0 INTERVIEWS The previous owner and current Site Manager, Mr. Frank Arnaudo of B&B Arnaudo, was interviewed in person on September 25, 2001, during a Site visit. Mr. Arnaudo stated that he had used the property for farming since 1968 and it was used for farming prior to his ownership. Alfalfa, sugar beets, corn, wheat, and tomatoes (which he stopped growing in 1983) had been grown at the Site. When questioned about potable water, Mr. Arnaudo indicated that the farmhouse occupants in Neighborhood E obtained their potable water from Tracy.He also indicated that the farmhouse had a septic system and that the small drain- line, located north of the house,was for drainage of the residence's yard. A transaction screen questionnaire and a supplemental agricultural questionnaire were given to Mr. Arnaudo to review and sign during the Site visit. The questionnaires revealed the following with respect to the Site: 1. The Site was used for agricultural purposes. 2. Adjoining properties was used for agricultural purposes. 3. Pesticides were applied according to application standards and Pesticide Use Reports submitted to the San Joaquin County Agricultural Commissioner's Office. The User Questionnaire was completed by the Client and is located in Appendix E. The Environmental Professional filled out the Transaction Screen Questionnaire during the Site reconnaissance and it is located in Appendix E. 7.0 ADDITIONAL SERVICES A Tier one vapor encroachment screen was performed in accordance with the ASTM Standard.No nearby or on-Site sources of contamination were identified that would pose a subsurface vapor intrusion risk to future occupants of the Site. 8.0 FINDINGS The approximately 3-acre Site 54 West Conejo Court located in Neighborhood E of Mountain House, California. The Site was used for agricultural purposes since the 1930s. In the early 20'I' century, Shell operated twin crude oil pipelines that transected the Neighborhood 1,300 feet west of the Site and were partially removed during the 1960s.The pipelines leaked in certain areas,releasing petroleum hydrocarbons (crude oil and diesel range hydrocarbons) into soil and groundwater. Condor conducted a Phase I ESA on the Site in 2001. One recognized environmental condition was identified for the Site: 1. The former agricultural use of the Site possibly having resulted in residual pesticides and herbicides in soil. Condor conducted an assessment for agricultural chemicals on the Site and entire neighborhood in 2002 as documented in the Phase II Environmental Site Assessment Report, Proposed Neighborhood E, Portions of Assessor's Parcels 209-050-06, 209-050-02, 209-050-07, and 209-050-04, Mountain House, San Joaquin County, California,dated July 3,2002.The soil samples collected from the Site and Neighborhood E did not contain detectable residual pesticides or herbicides above the laboratory reporting limits, and the laboratory reporting limits were well below sensitive land use screening levels. iia CONDOR