Agenda - 11-23-1987 - Laserfiche WebLink

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CHANDLER CONCRETE CO•, INC. 0 5 5_ ; READY MIXED CONCRETE POST OFFICE DRAWER 1239 BURLINGTON. NORTH CAROLINA 27215 (919) 225.1181 Page Two The basins work as a unit, basin #1 remains at a constant 4' depth, acting as a settling pond, before the water overflows into basin #2. In basin #2 a sump pump is installed that pumps the water to a station to be reused. The water in the holding tank is used as wash water for the trucks and is also used to temper the truck's concrete load, prior to leaving the site. More water can be used from the reclaiming system than flows into the basin daily. The third basin is used exclusively for catching rain water run-off. A 100 year storm can be contained with basin #2 half full and basin #3 empty. Basin #3 is emptied by the sump pump in basin #2. Sedimentation that accumulates in the bottom of any of these basins can be removed with a backhoe. Depth of sediment is only critical in basin #2 and #3 since they are needed to store the maximum storm water run-off volume. A copy of the permit granted by the Department of Community Development and Natural Resources is attached. C. Truck Circulation: 1 In the proposed system, the truck would come into the plant at driveway "B" and park in a parking space. When the dispatcher is ready to send a load the truck backs under the plant. The truck is loaded with cement, rock, sand and water. The truck drives to the water station and has his load tempered. When his tank is full, the truck leaves through driveway "D". By having driveway "D", the drivers have better vision and can make entrance onto State Road 1710 safely. D. Truck cleaning: Every two to three weeks the outside of the trucks are washed with a concrete removal solution. The solution reacts with the cement residues and removes the residue from the truck. The reaction of the two items neutralizes the concrete removal solution. This solution is further diluted when it flows into Basin #1. E. Water Circulation: Water is generated from three distinct sources: (1) truck wash water, (2) plant run-off water, and (3) storm run-off. In order to control the storm water run-off from the plant, three basins are required to hold the water from a 100 year storm. Investigating the elevations of the exisitng 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.