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<br />Relocation of Conduit 10 to the east would incorporate <br />a section of Conduit 27 and would be consistent with long- <br />range planning. The sections of Conduit 10 would be a 48 <br />inch line and that of Conduit 27 a 90 inch line. This al- <br />ternative will achieve the same results as the Corps plan but <br />will include elements of the Roxborough System. Cost of the <br />conduits, clearwell, and pumping station is estimated to be <br />$7,505,000. Since the head on the pumping station is much <br />higher, the annual operation and maintenance expenses of the <br />pumping station are estimated at $210,000. <br />d. Operation of the Infiltration Gallery on a "calculated <br />risk" basis or abandonment of the gallery. The gallery, <br />after construction of the Chatfield Project, will not be as <br />controlled as presently and will be subject to contamination <br />by substances not now a problem. The gallery could be lost <br />as a supply source due to these undesirable substances enter- <br />ing the porous strata. <br />Water lost by abandonment of the gallery will have to be <br />replaced as an incremental part of the next major water supply <br />project of the Board. Because of the availability of costs, <br />the Blue River Project has been used as a basis for determining <br />the incremental cost of water replacement. On this basis, re- <br /> <br /> <br />placement cost for the Infiltration Gallery water is estimated <br /> <br /> <br />to be $1,353,000. Operation and maintenance expenses of the <br /> <br /> <br />Board would be reduced about $6,440 annually if the gallery <br /> <br /> <br />is abandoned. <br /> <br />- 9 - <br />