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-2- Mr. Gary Davis September 13, 1976 Given these facts, I suggest that: 1. The casing should be deeper, to at least several tens of feet below the water table, if you wish to insure protection against recycling your ef- fluents. I don't see how recycling can be avoided when effluents will move down toward the cone-of- depression under gravity influence. 2. Since it is not feasible now to add casing, I urge that you and others in the Deer Run Heights Sub- division periodically have your water supply analyzed for bacteria and nutrients commonly as- sociated with septic-tank effluent. 3. A reconnaissance study be conducted to determine the water-table configuration in the subdivision area. I will explore whether any hydrogeology graduate students would be interested in that as an independent study. I would be willing to super- vise such a study at no charge. 4. Mr. Tom Calabresa, Chief of the Private Water Supply Section of the Department of Natural Re- sources should be appraised of your concern. He may have authority to "force" you to rebuild your wells if a health hazard does exist; I'm not sure on the code. Nevertheless, if a hazard does exist, I am assuming you would want to take remedial action. On the beneficial side, if a problem does exist now, you would have a strong argument for any future devel- opment plans to be examined in detail before approval. 5. Prior to any further land development in the area where septic tanks would be installed, I suggest the developer, or perhaps the state, should conduct a ground-water investigation. The primary goals would be to identify: (a) the position of water- table divides; (b) annual fluctuations of water table; (c) rate of ground-water movement; (d) ability of soil to attenuate contaminants from septic-tank effluent; (e) the nature of voids (fractures, joints) within bedrock; (f) permeability and water-yielding charac- teristics of the bedrock aquifers. This would be an expensive study, but warranted, in my opinion, based on the adverse geologic environment relative to use of septic tanks in your home area.