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31 March 2014 1. AGE Project No. 14-2997 Page 2 of 5 The review of records also revealed septic system permits indicating the presence of three septic systems at the subject property: One system associated with the 'Old Office' building, one system associated with the 'Shop 2' building and one system associated with one of the shop buildings, including a drainage line from one of the wash racks. Based on hand-drawn diagrams, the drainage line is likely from the 'Interior Steam Cleaner' located adjacent to the 'Shop 1' building. San Joaquin County Assessor's Office records contained records pertaining to USTs: APN: 171-300-03 Service Station Record indicates a service station, constructed in the late 1940s, was located in the dirt/gravel parking area in the northeast corner of property. The service station consisted of four 1,000-gallon fuel USTs. Observations dated 1952 noted the tanks were rusted out and unusable. Assessment and computation records indicate a 3,000-gallon UST, a 7,000-gallon UST and two associated pumps were located on the property. The installation date (estimated approximate 1940s), location and contents are unknown. The assessment record also indicated removal of an 'old fuel island' in 1975. The record is probably in reference to the service station fuel island. The assessment record also indicated installation of a 'new fuel island' (likely, the current dispenser system). The service station is visible on aerial photographs between the 1960s and 1970s. APN: 171-300-13 Service Station Record with earliest assessments dated 1959, details the presence of a UST system consisting of a 1,000-gallon UST, a 10,000-gallon UST and three pump islands. Service station last assessed in 1976. 3.0. SCOPE OF WORK AGE proposes to advance soil borings in the areas of concern, to depths of 20 feet bsg, to define the lateral extent of petroleum hydrocarbon-impacted soil. Soil borings will be advanced in the area of the former service station, in the area between the Interior Steam Cleaner and the Truck wash building, focusing in the area of the septic system and drainage line, and in the area of the former service station on the southern portion of the subject property. The assessment activities will consist of the following tasks: • Permitting and pre-field work activities; • Advancement of soil borings for collection of soil samples; • Sample analysis; Advanced GeoEnvironmental Inc.