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TO: R. Richard Wagner, Chairman Dane County Board of Supervisors -2- January 31, 1989 agreement to properly service the tanks if the owner fails to do so. At the volumes projected this could be a major liability for the Town. All in all the holding tanks would be the least preferable solution from our perspective. An onsite treatment plant with surface discharge would be an option worth consideration. Charles Burney at the Department of Natural Resources has indicated that if a study showed that connection with a nearby treatment facility would be more expensive than construction of the on site treatment plant , the non proliferation policy would not be applied. It would appear that construction of a sewer line and possible expansion of the receiving facility at Oregon or Stoughton could easily exceed the cost of an on site plant . If the non proliferation issue was resolved in favor of the on site treatment plant , the other problems would be relatively easily overcome. Certainly the cost in the long run would be substantially less than the alternative of a holding tank system. Employees with the technical knowledge and skills to operate the plant may be available on a contract basis from a surrounding community. With proper design the impact on the receiving body of water would not be greater than if the sewage were routed to a different facility for treatment and discharge to the same water body. This type of facility would not be expected to contribute to the degradation of the groundwater quality. ** It would appear to this office that the onsite treatment facility with surface discharge would be the most suitable method of treating the volume of wastewater generated by this proposed racetrack. Groundwater Impact The most apparent threat to the groundwater quality from the race- track operation would be a possible increase in nitrate levels if a soil absorption type wastewater treatment system is chosen. If either of the other alternatives is selected, there would be virtually no impact on the groundwater quality that would be anticipated. It should be noted that the concern about nitrate levels extends almost exclusively to some infants from birth to six months of age . Informa- tion from the State Laboratory of Hygiene confirms that high nitrate levels do not generally present a health threat to persons over six months of age, pregnant women, fetuses , or breast fed infants.