Agenda - 08-26-1985 - Laserfiche WebLink

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. _ • 091 PHILIP POST &ASSOCIATES INGINEERS/PiaWAIFISt SURVEYORS 41, Cnandler Concrete. Inc. . Hillsborough. N .C. Page Two The basi.ns 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 Lnatalled that pumps the water to a 2,000 gallon holding tank. .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. A cross-section of the basins is shown on drawing #1. 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. _ • Per the attached calculations this system will prevent overflow of the basins into ad3acent stri=ems. 411 C. Truck circulation: Currently the truck comes into the plant on driveway "B". Drives behind the gravel and sand bins and parks until the next load is ready. The truck pulls up next to the office and backs under the plant. The truck is loaded with cement, sand. rock and water. The truck leaves the site through driveway "C" . 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. Is loaded with cement, rock, sand and water. The truck drives to the water tank and has his load tempered. When his tank is full . the truck leaves through driveway "0" . By having • driveway "D", driveway "C" will be eliminated because it is in the middle of curb and driveway "0" has better sight distances. • Drawing two provides a diagram of the flow. • 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 rp,sidue from the truck. - 40 The reaction of the two items neutralizes the concrete removal solution. This solution is further diluted when it flows into Basin #1 .