25F - AGMT - DELHI DIVERSION PROJECT

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Preliminary Design Report Addendum No.2 5.0 COST EVALUATION In this section, the alternatives developed for the Delhi Diversion Facility have been evaluated for cost - effectiveness. The conceptual costs include capital, and operation and maintenance costs. Capital costs were considered for the Diversion Facilities, conveyance piping and pump stations. 5.1 CAPITAL COSTS The original estimated costs of the Urban Discharge Water Diversion System that was presented in the Santa Ana Delhi Channel Diversion Project, Preliminary Design Report Dated July 31, 2012, which incorporated a new pump station and force main, were approximately $3,430,500. The PDR addendum No. 1 dated August 2014 had an estimated cost of $3.7 M. The estimated construction costs for the Santa Ana Delhi Diversion and Treatment System are presented below: Option A — In- channel structure Rubber Dam, Force Main Route 3 Option B - In- channel structure Rubber Dam, Force Main Route 5 Option C — In- channel structure Radial Gates, Force Main Route 3 Option B - In- channel structure Radial Gates, Force Main Route 5 The estimated cost has been revised based on several updates. The original cost estimate for radial gates was $250,000 and has revised to $970,000. Cost for four water storage tanks of $184,000 which were added to the updated version. It is also critical that if the golf course will not be able to accept the harvested flow for irrigation, then all the harvested dry- weather flow will have to be pumped to OCSD trunk main. Subsequently, an increased cost of $961,000 for the 8" FM routing to the nearby CMSD sewer connection location increases the cost of the FM routing to the OCSD trunk main to $2,060,000. This is a significant increase compared to $1,125,000 for the Addendum No. 1 cost estimate for the 4" FM. Table 4- 5 Cost Estimates for Four Alternative Options Item # Item Description Estimated Cost 1.0 Mobilization (not to exceed 5% of the total contract) $169,000 2.0 Preparation of Construction Management Plan $10,000 3.0 SWPPP maintenance (0.5% of construction cost) $17,000 4.0 Surveying and construction staking (not to exceed 2% of the total contract) $67,000 5.0 Permits OCFC, ACOE, Fish & Game, OCSD) $15,000 6.0 Traffic control (5% of construction cost) $169,000 7.0 Clearing and grubbing (5% of Construction Costs) $169,000 8.0 Temporary shoring including removal of top five feet $360,000 9.0 Site unclassified excavation including stockpiling and export $167,000 ults 29 25F -161