Agenda - 08-26-1985 - Laserfiche WebLink

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092 • PHIUP POST &ASSOCIATES • ENGMMRS/PLANNES/SURVEMPS 111 - Chandler Concrete Co. , Inc. Hillsborough. N.C. Page Three E. Water Circulation: • Water is generate from three oistinct sources: (1) truck wash water. (2) plant run-off water . and (3) storm run-off. In order to contral the storm water run-oli, from the plant, three basins are required to hold the water from a 100 year *storm. Investigating the elevations of the existino property, the 'run-off flows into the basin as shown. The site - spot elevations also indicate that the water will not flow to . any other part of the site. The rain water will flow to the area shown, which is the lowest area adjacent to the plant. Water from the railroad ditch will not flow into the basins. The normal water circulation will occur in the following • manner. Truck wash: water and plant run-off water will flow into basin #1 at the-normal rate of 3000 gals. per day. It will take approximately 11 day i to fill the basin with water to a 4' level. In this basin all particles will settle to the bottom and clear water will flow into basin #2. A sump pump is installed in basin #2 and the Sump pumps the clear water into a • 111 2000 gallon holding tank on the plant side of basin #1 . The water in the *tank is pumped into the trucks as temper water and as wash water. Excess water can be used in the plant if necessary. The water level in basin #2 be no higher than 2' during normal operation. During rainy periods the storm water run-off flows from the plant site into basin #1. settles out the particles and flows into basin #2. When basin #2 fills up the water automatically flows into basin #3. The pump is capable of pumping water from both basins into the holding tank. • • •