No waste, sludge, water or effluents of any type where an oil or gas well is being drilled or operated shall in any manner be emptied or drained into any storm or sanitary sewer of the City or in any open watercourse. All sludge shall be confined to a pit during the drilling period and shall, after completion, be covered to the original ground level, except a small pit for water overflow. (Ord. 77-67. Passed 8-7-67.)