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V. DISCHARGE PREVENTION MEASURES (40 CFR 112.8) A. Facility Drainage (40 CFR 112.8(b)) Site topography slopes very gently from north to south. The highest point at the site is located on the northern portion of the site in the vicinity of the office building. A very large release from the on-site storage areas, if not contained, could migrate over paved and unpaved areas to the topographic low point located on the southern portion of the site. A release reaching this location would migrate across approximately 200 yards of unpaved ground and would ultimately reach the holding pond located along the southern border of the site. In heavy precipitation events, the holding pond discharges to an off-site drainage channel. Storm water that accumulates in the concrete containment structures below the diesel and waste oil tanks is allowed to evaporate or, during the cooler seasons, the accumulated water is removed in accordance with the following procedure outlined in Section IV.B of this plan. Discharge valves on the concrete containment structures are maintained in the closed position. No flapper-type valves are located on any containment structures. B. Bulk Storage Containers (40 CFR 112.8(c)) Bulk storage units at the Maxim Crane Works facility consist of aboveground storage tanks and drums. A list of all storage units is presented on Table 3 and locations of the units are presented on Figure 3. In designing petroleum storage units and containment systems, the facility shall identify and take into consideration adverse weather conditions and natural phenomena that are common or likely to occur in the specific geographic location of the facility, including, but not limited to, intense rainfall, high wind or water, and seismic activity. 1. Materials of Construction (40 CFR 112.8(c)(1)) All bulk storage units used for oil storage are constructed of stainless steel that is compatible with petroleum products and in compliance with current construction standards. All tanks are appropriate for use under the actual use conditions, which include: (1) ambient temperatures within the full range of temperatures normally occurring in the Stockton area; (2) exposure to rain and extended periods of sunlight; and (3) the atmospheric pressures present. 2. Secondary Containment (40 CFR 112.8(c)(2)) A description of the existing secondary containment for each aboveground storage tank is presented in Section IV.B and on Table 3. The outdoor aboveground storage tanks have secondary containment of sufficient capacity to contain the entire contents of the largest tank within the containment area plus a sufficient allowance for precipitation, as presented in Section IV.B and Table 3. -19-