Agenda - 10-14-1993 - D 1 - Laserfiche WebLink

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art safeguards to protect water quality. All fuel and asphalt storage tanks will be above ground, mounted on a concrete pad and surrounded by a concrete containment wall capable of holding the contents of all tanks within the containment. The pad of the containment structure will be sloped so all internal flow travels to a concrete sump for easy removal. Rainfall entering the containment structure will be passed through an oil/water separator. All petroleum products collected by the separator will be placed in a waste oil tank which will be emptied regularly. Water from the separator will be placed in a pond which will also be equipped with two devices to protect against oil pollution. The first is an inverted siphon which would permit only water from below the pond surface to discharge into the settling basin. The second device consists of placing oil absorbing material on the ponds surface to absorb any oil passed by the separator to the siphon. As a further precaution against fuel contaminants, the entire area in which fuels and asphaltic materials will be stored, processed, and handled will be graded so that natural surface flows will be directed to the pond mentioned above. The two methods described above will remove any oil which might enter this pond. The clean water from this pond will pass through an inverted siphon to a sedimentation basin which will hold any soil which might be present in the runoff water. Because this basin will be protected from having oil enter it, no liner is needed. The entire erosion control plan has been designed so that no oil or petroleum products will either enter the soil or be carried offsite in stormwater runoff, and the plan also provides for silt fencing and a settling pond for the construction phase. The completed site will have a total of three ponds to contain runoff water. Any earthen berms and land disturbance areas will be vegetated in accordance with the Soil Erosion Control Plan,as detailed under the Seedbed Preparation and Seeding Schedule. Ponds are designed to handle a 100-year storm event. In consideration of the plant's sensitive location, the usual industry practice of spraying beds of haul trucks with petroleum based solvent to prevent adhesion to the truck bed will not take place. Instead anti-adhesion will be accomplished using a non-p:fluting biodegradable product. A 401 water quality certification has been issued by the North Carolina Division of Environmental Management for the quarry portion of the project. 4-7