01-16-1996 Planning Packet - Laserfiche WebLink

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- Estimated costs (1994 daa): - Holding tank instaUaiion 5-,^ - Regular maintenance (pumpouts) $5,0(X)/year ♦assumes 3 occupants x 75 gpd x 365 davs x Sl20/pumpom 2,(XX) 2al. per pumpout d. STEP Svstem . , , • . i,. Requires continued maintenance of individual septic tanks. . With each house having a pump to maintain, costs are ongomg. - This is a low front-end cost alternative to standard sewers, but may create permanent maintenance headaches. - Still requires hydraulic capacity in local sewer system. Neighborhood collector system with community drainfield - Sensitive to soil/water table conditions. - Ongoing maintenance required (may be individual tanks or community tank). - Need future expansion area available as safety factor. - High cost of site acquisition. - Failure risk may be higL. replacement cost expensive. - Unlikely that technically luitable sites can be located due to high water tables. - Community drainfields risk groundwater moundmg and resultant inadequate treatment. - Collection system cost is equivalent to cost of mumcipal sewer collector system; the cost of community drainfield construction is likely to exceed the cost of force mam to existing sewer system. f. Flow reductions - Cost to retrofit each residence with low-flow fixmres is variable. - Benefits will be variable from household to household. - Use of fixmres (or theii* evenmal removal due to frustration) is impossible to monitor). - Flow reductions will not solve the problem of lack of 3-foot separation between the seasonal water table and the bottom o the treatment system. - While applying flow reduction technology to individual homes might result in 20-50% reductions in sewage volumes, and mieht even restore some failing (discharging) systems to a hydraulically functional condition, treatment may still be inadequate.