MIL-HDBK-1005/16
quantity and characteristics of residuals. In addition, recycle
flows from solids handling and treatment processes can
significantly affect liquids treatment processes and should be
evaluated.
As an alternative to new or modified facilities,
consider tying into existing POTWs by evaluating life-cycle
costs. Consult service policies on tie-in criteria. In general,
alternatives should be evaluated using a cost analysis that
considers both life-cycle costs and other non-monetary evaluation
criteria.
2.7.2.1
Life-Cycle Costs Evaluation. Evaluate alternative
wastewater processes and facility configurations using order-of-
magnitude costs and a life-cycle cost evaluation, which includes
the following:
a)
Capital costs, including construction costs and
associated legal, engineering, and administrative costs
b)
Annual O&M (operation and maintenance) costs
estimated for the planning period of the project, usually 20
years
c)
Replacement costs for equipment and facilities
during the planning period
d)
Salvage value and demolition or decommissioning
costs for facilities at the end of the planning period
e)
Total present-worth costs or other comparative
costs in present-day dollars for Items a through d
Capital costs, annual O&M costs, and total present-
worth costs should be presented for each alternative.
2.7.2.2
Non-Monetary Evaluation. Alternatives should also be
evaluated using non-monetary criteria, which should be
established with input from key personnel responsible for the
construction and operation of the proposed facilities. Table 1
presents several non-monetary evaluation criteria.
Evaluation using non-monetary evaluation criteria is
largely subjective and, therefore, should be done with the
participation of key personnel. If desired, non-monetary
criteria can be weighted, and each alternative can be ranked for
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