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CONCLUSIONS <br /> 1. The treated effluent is not sewage. It is highly treated water that meets the RW.Q.C.B. <br /> criteria as well as the Title 22 requirements for public exposure. <br /> 2. There is no "raw" contamination which can be "moved" anywhere. <br /> 3. A household septic tank (which is allowed within 150' of a domestic well) constitutes a <br /> threat, where as a fully treated - disinfected effluent which percolates at a distance of <br /> 1,300' is not. <br /> ODORS <br /> 1. Odors occur when organic material is subjected to anaerobic (without oxygen) conditions. <br /> 2. If odors were going to occur they would occur at the treatment plant where the organic <br /> materials are being treated not in the disinfected effluent. The plant is designed to keep <br /> conditions aerobic. <br /> 3. The ponds are aerobic and are flooded in shallow layers. They are periodically dried out, <br /> disced, and then put back in operation. The ponds are not part of the treatment process. <br /> 4. Ponds, such as at Lodi, are called "facultative ponds". What this means is that the ponds <br /> are used as a major portion of the treatment process. The water depth is constantly kept <br /> at about a 6' depth. The top of the pond is aerobic because of algae growth(algae <br /> produce oxygen) while the bottom is anaerobic. It is designed this way so that the <br /> anaerobic portion breaks down the excess organic material (including excess algae) and <br /> returns the "digested" material so that more algae are grown. This has advantages of low <br /> energy usage, however the digestion process produces "boils" of gas that reach the <br /> surface. The swampy-rotten grass odor which anyone nearby notices comes from that <br /> process. <br /> The process at Crossroads does all the treatment at the plant site. Algae odors are <br /> avoided because there is no permanent standing water, and the ponds are rested between <br /> cycles. <br /> 1995/0112NOT.SC <br />