WATER POLLUTION CONTROL
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Abstract
THE CONTRACTOR'S EFFORTS TO PREVENT POLLUTION OF TROUT FISHING STREAMS WITH SILT AND SAND CONTAIMINATED WATER FROM A MOUNTAIN TUNNEL BORING OPERATION ARE PRESENTED. IN AN EFFORT TO TREAT 160 GALLONS OF WATER PER MINUTE BEFORE RELEASE INTO A HIGH QUALITY STREAM, THE CONTRACTOR USED SEDIMENTATION POOLS BUILT IN SERIES. ALUM WAS ADDED TO THE WATER TO PREVENT COAGULATION AND SEVERAL MODIFICATIONS WERE INTRODUCED TO IMPROVE EFFECTIVESS OF THE SILT REMOVAL PROCESS. AN EFFLUENT TROUGH AT THE END OF THE POOLS ALLOWED A GENTLE OVERFLOW AND IMPROVED THE CLARITY OF THE WATER. THE POOLS REQUIRED FREQUENT CLEANING BUT THE ADDITION OF CHEMICALS WAS NOT ALWAYS NECESSARY. GREATER CONSIDERATION FOR THE DISPOSITION OF CONTAMINATED EFFLUENT IN THE DESIGN PHASE OF TUNNEL EXCAVATION WORK IS URGED. PROVISION IN THE PLANS AND SPECIFICATIONS FOR A TREATMENT SYSTEM AND THE CLEANING AND DISPOSING OF THE SILT, AND ALSO FOR THE PAYMENT OF SUCH ITEMS, IS ADVISED. THE REPORT INCLUDES A SCHEMATIC DIAGRAM AND PHOTOGRAPHS OF THE PROJECT.