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- Estimated costs (1994 data): <br />- Holding tank installation $2,280 <br />- Regular maintenance (pumpouts) $5,000/year* <br />♦assumes 3 occupants x 75 gpd x 365 days x $120/pumpouc <br />2.000 gal. per pumpout <br />d. STEP System <br />- R^uires continued maintenance of individual septic tanks. <br />- With each house having a pump to maintain, costs are ongoing. <br />- This is a low front-end cost alternative to standard sewers, but <br />may create permanent maintenance headaches. <br />- Still requires hydraulic capacity in local sewer system. <br />c.Neighborhood collector system with community drainfield <br />- Sensitive to soil/water table conditions. <br />- Ongoing maintenance required (may be individual tanks or <br />community tank). <br />- Need future expansion area available as safety factor. <br />- High cost of site acquisition. <br />- Failure risk may be high, replacement cost expensive. <br />- Unlikely that technically suitable sites can be located due to <br />high water tables. <br />- Community drainfields risk groundwater mounding and <br />resultant inadequate treatment. <br />- Collection system cost is equivalent to cost of municipal sewer <br />collector system; the cost of community drainfield <br />construction is likely to exceed the cost of force main to <br />existing sewer system. <br />f. Flow reductions <br />- Cost to retrofit each residence with low-flow fixnires is <br />variable. <br />- Benefits will be variable from household to household. <br />- Use of fixtures (or their eventual removal due to frustration) <br />is impossible to monitor). <br />- Flow reductions will not solve the problem of lack of 3-foot <br />separation between the seasonal water table and the bottom of <br />the treatment system. <br />- While applying flow reduction technology to individual homes <br />might result in 20-50% reductions in sewage volumes, and <br />might even restore some failing (discharging) systems to a <br />hydraulically functional condition, treatment may still be <br />inadequate.