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A 1 1 t 1 A 1 r f e J 1 All screened material and water that would flow off the end of the screen would be collected in a sump. Water and the screened material would be pumped to vibrating screens that would remove excess water from the screened material. The vibrating screen proved to be an effective relatively maintenance free, device to remove excess water from the screened material. The screened material would then be pumped to a lagoon system. The lagoon system would need to contain enough cells to allow drying and sludge removal. Total lagoon area would be approximately 30 to 40 acres to handle the design flow. The facility would need to be heated and ventilated, and equipped within engine generator to provide emergency standby power. The total construction cost for the screening facility was estimated to be $40,000,000 in 1981 dollars. As many as thirty full-time employees could possibly be needed to operate the facility with a total yearly operating budget of $1,300,000. 1.3.9.3 Havasu Pump Plant The Havasu Pumping Plant (HPP) is located adjacent to Lake Havasu approximately 20 miles northeast of Parker, Arizona in Yuma County. HPP delivers water from Lake Havasu into the 335 mile canal system of the Central Arizona Project (CAP). The CAP was authorized in 1968 to deliver water from the Colorado River, via Lake Havasu; to central and southern Arizona for agricultural, municipal, and industrial purposes. HPP is designed to pump a maximum of 3,000 cfs. Water deliveries consistently increased from approximately 108,000 to 900,000 acre-feet during 1986 through 1990 with most of the water being pumped from March through September. Lake Pleasant is an off-canal storage reservoir on the Agua Fria River approximately 150 miles downstream of HPP. Lake Pleasant was enlarged in 1993 allowing for more storage of canal waters delivered through HPP for the CAP.. The majority of water diverted at HPP is now during the winter months. This water is stored in Lake Pleasant and released to CAP during the summer months. 'The potential introduction and colonization of non-native fish species into the CAP, and subsequently into natural Arizona water, have been a concern since the initiation of pumping at HPP. Non-native fish species are considered a threat to native species in several of the Arizona river systems that are part of the CAP. Even though fish mortalities will occur at HPP, some fish will survive and be transported to the lower portions of the Salt and Verde Rivers. Studies have determined that approximately 17 species of non-native fish have colonized extensively in the CAP. Large non-native fish have been found in the canal directly downstream of HPP which would indicate that all life stages could be entrained. Several studies were conducted to estimate the number of eggs and larvae that might be entrained at HPP. These studies estimated entrainment rates of approximately 3 million larvae per 10 pumping hours and 0.08 eggs per cubic meter. Several screening options were studied to limit the introduction of non-native fish species into the CAP system. Five fish screening/barrier alternatives were developed at a conceptual level for the HPP. The five alternatives are as follows: • Fish Screens Upstream of HPP with Fish Bypass. • Fish Screens Mounted to Existing Trashracks Located Upstream of HPP with no Fish Bypass. • Fish Screens Downstream of HPP with Fish Destruction. • Electrical Barrier Downstream of HPP with Fish Destruction. • Combination of Fish Screen Upstream of HPP with Electrical Barrier Downstream of HPP. Control Structure Feasibility Evaluation Miller Ecological Consultants, Inc., February 18, 1997 1-30