My remarks will be confined to the drilling of wells in rock, that being the type of well with which I am most familiar.In my opinion the most important points in the construction of a new well are:1. Full and complete specifications and a bid sheet permitting a fair comparison of prices 2. The selection of a responsible contractor 3. A plumb, full size hole 4. Proper sealing 5. Proper and complete testing (1) The preparation of specifications for drilling a hole in the ground would seem to be a simple matter. In my opinion it is not as simple as it first appears. There are several points both in the specifications and in the bid sheet which may cause difficulty in deciding the low bidder and misunderstanding in making payments. These points should be clearly set forth in fairness to both the contractor and the purchaser.We, in Ridgewood, do not contract for a flat sum to a fixed depth, but call for bids by the foot. For instance, our bid sheet reads as follows:
In 2003, the District of Columbia Water and Sewer Authority published an Odor Control Master Plan (OCMP) for the Blue Plains Advanced Wastewater Treatment Plant with the intent of developing a longterm strategy for further odor mitigation. Facility modifications have been made over the past ten years that incorporated odor mitigation measures within new Capital Projects as recommended in a previous odor study. Actual gains of these mitigation measures versus prediction, and need to establish a revised baseline for odor prompted a subsequent OCMP study in 2011. The goals of the OCMP study were to develop a strategy to minimize offsite impacts and facilitate selection of effective odor mitigation measures and process changes.Using an air dispersion model as a way to estimate impacts and improvements, multiple control and dispersion strategies were developed for a variety of source categories around the Plant. The control strategies and engineering solutions evaluated for the Facility's Primary Sedimentation Tanks are discussed and a cost / benefit analysis is provided for each option considered.
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