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28 October 2020 AdvancedGeo Project No. 20-6092 An Employee-Owned Compony Page 5 of 20 The petroleum storage for service and repair activities are located within covered areas within the building at the southeast corner of the shop area. This area contains two 1,000- gallon UL listed double walled ASTs which store new and used motor oil and one 120- gallon double walled UL listed new oil tank. Additionally, this area stores six (6) 55-gallon drums with used oil filters and two (2) 55-gallon drums with new oil. All of the 55-gallon drums are placed on spill pallets that are used as secondary containments in case of a spill. The shop maintenance area has a spill kit containing absorbent materials and tools to be deployed in the event of a spill. The remainder of the facility is used for driveways and for truck parking. The ground surface is paved with asphaltic concrete throughout the property, except for a section of the property on the southeast which is used as a stormwater detention basin. The stormwater detention basin is rectangular in shape and is located at the southeast of the property which is the direction of the natural slope of the property. Employee and visitor vehicles are parked along the north perimeter of the site. Facility structures and operating areas are shown on the Site Plan (Figure 2). The location of petroleum storage areas, the 6,000-gallon ASTs, spill clean-up equipment and fire extinguishers are also shown as required under 40 CFR 112.7(a)(3). 3.5.3. Distance to Navigable Waters and Adjoining Shorelines and Flow Paths The Facility is situated within the Great Valley Geomorphic Province of California, an elongate, northwest trending structural trough running 400 miles through Central California. The Great Valley is bound to the north by the Klamath Mountains, the south by the Tehachapi Mountains, the east by the Sierra Nevada Mountains, and the west by the Coast Ranges. The Facility is located on relatively level terrain. Stormwater drains from the property via surface sheet flow to the southeast direction towards the dry detention basin which is rectangular in shape on the southeast perimeter of the Site. The city storm drain system is directed the San Joaquin River approximately two and one quarter miles southwest of the Facility. 3.5.4. Discharge History The Facility has not had any known discharges since the installation of the ASTs. If a discharge were to occur, it would be recorded within Table 4. 3.5.5. Material Stored at this Facility — 112.7(a)(3)(i) Oil storage at the Facility ranges from a 6,000-gallon diesel fuel AST to 55- gallon drums containing petroleum products. The type of storage containers, capacity and contents are summarized in the table below and included in Table 3. Petroleum products are stored