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• <br /> Thomas E. Wohlleber <br /> July 22, 1992 <br /> Page 5 <br /> construction, however, a recent lawsuit by the Public Intervenors office may <br /> create a change in this policy. For purposes of this discussion and cost <br /> comparison, we have assumed a variance approval for a design flow similar to <br /> that allowed for West Middleton Elementary School (5,500 gpd) would be <br /> granted. The incorporation of ultra low-flow water fixtures into the building <br /> plumbing design could further reduce the design flow to approximately 3000 <br /> gpd. Table 1 has been developed for comparison of areal requirements and <br /> estimated costs for the two types of systems at three design flow options. <br /> Table 1. System Alternatives Comparison <br /> System Type Area Required (acres) Cost <br /> Design Flow (15,000 gpd) Code Flow <br /> In-ground 5 $210,000 <br /> Mound 2 $240,000 <br /> Design Flow (5,500 gpd) Variance for Reduced Design Flow <br /> In-ground 2 $85,000 <br /> Mound 0.75 $95,000 <br /> Design Flow (3,000 gpd) Variance and Flow Reduction <br /> In-ground 1 $55,000 <br /> Mound 0.33 $61,000 <br /> Note: Costs include contingencies (10%) and engineering (15%) with the <br /> exception of the 15,000 gpd option which includes engineering fees at <br /> 20% due to additional effort to meet "Large System Guidelines". <br /> Systems are designed at 150% to allow for resting of one infiltration <br /> cell on an annual basis. <br /> Acreage for in-ground alternatives includes replacement area <br /> arptrdir.wp <br /> 4153.00 <br />