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Work Plan—PEA Page 3 Former Haley Flying Service GPE Project 474.2 information, it does not appear that any gas wells were ever drilled on, or near, the subject property. The USDA Soils Conservation Service Soil Survey of San Joaquin County, California, October 1992 soil survey report classifies soil in San Joaquin County. The Survey generally classifies the soils in this area of Tracy as part of the Capay association; moderately well drained fine textured soils, very deep and subject to artificial wetness. The on-site soil is specifically classified as Capay clay, 0-2 percent slopes; a very deep, moderately well drained soil on alluvial fans. 1.2 Site Background The property was the subject of a Phase I Environmental Site Assessment (ESA) completed in October of 2004 by Geo-Phase Environmental, Inc. The following paragraphs summarize the findings of the ESA. According to the owner, Mrs. Haley, beginning in 1951 her late husband and a partner operated the site as Haley's Flying Service, a crop dusting operation (see Figures 2 & 3 for site layout). The specific agricultural chemicals that were stored and used on the site are not known, but are presumed to include: DDT and other organo-chlorine, organo-phosphate, and N-Methyl Carbamate, pesticides; and chlorinated and triazine herbicides. Mr. Haley died in 1975, but the partner continued to operate the business until about 1989. Since then, the facility has been leased to several non-aviation related persons or companies. Since the mid- to late- 1990's the principal tenant has been Continental Express, a small trucking company. An individual serves as an informal caretaker of the property and he maintains two mobile buildings on the site next to the former hangars. Prior tenants have included a tomato packing company, and a truck repair business. The existing buildings on the site date from the time the property was used for crop dusting. According to information in the county Assessor's records, in 1955, an aircraft hangar was constructed and a second hangar was constructed in 1968. An office that connects the two hangars was constructed in 1976. According to Mrs. Haley, the paved area east of the hangars and adjacent to the loading dock was where aircraft were loaded with pesticides or other agricultural chemicals for spraying. The pavement in the area of the loading dock is locally cracked, and it is clear that spilled liquids could have penetrated to the underlying soil. The loading dock was where bulk chemicals were stored, mixed and then pumped into waiting aircraft. Upon returning from a flight, the crop dusting aircraft would have their tanks rinsed and the rinse water was pumped into an adjacent concrete-lined washout pit. The rinse water in the pit would be aerated in an attempt to breakdown any residual chemicals. The pit has 4-inch thick walls and is about 40 feet long, 8 feet wide and four feet deep. Visual inspection of the concrete lining reveals that the concrete was poured in at least two separate events. The seams where the several parts of the concrete meet are zones of weakness where liquid could 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209) 569-0293 Modesto, Ca 95356 Fax: (209) 569-0295