—estimated cost $35,000. Report notes that separate flow from

—estimated cost $35,000. Report notes that separate flow from the school may create problems with hydraulic shocks that are dampened by long detention times in the lagoon.

—Follow lagoon with intermittent sand Filters —estimated cost $34,000. Report notes that there would be difficulties with fitting facilities into available land. Operation and maintenance costs of this option would also be considerable.

Cost figures on three other alternatives—surface aeration, chemical coagulation by use of reactor clarifiers and installation of a rock filter at the tail end of the lagoon—were not included in the report since the engineering firm felt that none of these options was viable.

The recommended alternative, a diffused aeration system, would require increasing the normal water level in the lagoon to a six foot depth and installing a diffuser pipe on the bottom. Blowers would force air from the pipe through the lagoon to speed up the breakdown of the sewage.

The $32,000 total cost estimate includes $14,000 for diffused aeration equipment, $16,000 for installation, including construction of blower house and $2,000 for electrical work and miscellaneous piping and fittings.

The report goes on to say that “health department may require final clarification and-or post aeration. If this becomes necessary, an additional $5,000 for clarifier and $2,000 for post aeration is necessary.”

A covering letter signed by project engineer John Garland states that the firm’s fee for services rendered will be $3,000 but adds that this figure “does not include additional work that would result from additional regulatory requirements.”

‘.‘I certainly feel this would have to be digested before we make a decision on it,” said Board Chairman Beverly Massie, after receiving the

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