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Brown Sand,Inc. Spill Prevention, Control, and Countermeasures Plan Page: 9 June 3, 2020 2.3 Evaluation of Discharge Potential(40 CFR 112.7(a)(3)) 2.3.1 Distance to Navigable Waters and Adjoining Shorelines and Flow Paths The Brown Sand, Inc. maintenance yard is located approximately 3,500 feet west of the San Joaquin River. This river originates in the Sierra Nevada Mountains and flows northerly towards the San Joaquin River Delta. 2.3.2 Facility Drainage (40 CFR 112.8(b)) The maintenance yard is primarily an unpaved area that allows for storm water to percolate into the ground and evaporate into the atmosphere. In addition, the maintenance yard is graded in such a way as to move storm water to the southwest, to the truck parking area, where it will collect in a depressed ponding area(Figure 6). Storm water captured in the depressed ponding area is allowed to percolate into the ground and evaporate into the atmosphere. Any potential discharge from the AST's will be contained within appropriate secondary containment structures or would flow in the direction of storm water and would be contained fully onsite in the depressed ponding area preventing any off site discharge or discharge to navigable waters of the State of California. Potential discharges and flow directions are further discussed below in Section 3.0 of this Plan. 2.3.3 Discharge History There have been no reportable spills at the site since it began operations in 1998. 3.0 Discharge Prevention (40 CFR 112.7) The following measures are implemented to prevent an oil discharge during the handling, use, storage, or transfer of petroleum products at this facility. Employees directly involved in handling petroleum products have received training in the proper implementation of these measures. WHO's Responsible? Name Discharge Prevention Timothy Clement