Salinas Valley Water Project 2010 Irrigation and Nutrient Management Field Day - February 23, 2010 Manuel Quezada / Chris Moss Monterey County Water R

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2 Salinas Valley Water Project 2010 Irrigation and Nutrient Management Field Day - February 23, 2010 Manuel Quezada / Chris Moss Monterey County Water Resources Agency

3 Presentation Salinas Valley Water Project Nacimiento Dam Spillway Modification Reoperation Obermeyer Gate Salinas River Diversion Facility Obermeyer Gate (Inflatable Dam) Pump Station & Pipeline Filter Screen Station Chlorination Facilities Fish Ladder

4 NACIMIENTO DAM SPILLWAY MODIFICATION PROJECT SUMMARY

5 Nacimiento Dam and Reservoir

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7 Introduction The Agency developed the Salinas Valley Water Project (SVWP) to address the water resources management issues within the Salinas Valley. Two Objectives: Stop seawater intrusion resulting from basin overdraft, and; Provide an adequate ate water supply for current and future needs.

8 Background SVWP contains three major components: Modifications to the Nacimiento Dam Spillway to safely convey PMF (~99,000 cfs) w/out overtopping or requiring Flood Pool; Construction of the Salinas River Diversion Facility, and; Re-operation of San Antonio and Nacimiento Dams.

9 Project Design Summary Original i Spillway height ht is El 800 feet, NGVD 29 Demolished existing Spillway 15 feet to El 785 feet Installed Obermeyer Gate - Gate height of feet Existing Chute & Approach channel walls were raised, strengthened and anchored Bridge pier required strengthening g High-Level Gate Operators modified Control house constructed t

10 Spillway Chute

11 Spillway

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13 Obermeyer Inflatable Gate

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24 Contract Update All major construction ti activities iti were completed March 1, 2009, ahead of schedule and under budget. Currently, closing out contract, will seek project approval from BOD. Granite Construction Contract Amount $9,998, Final Construction Cost $10,040,287 Cost Savings Agency receive credits from unused construction contingency, and from Obermeyer and Engineering contracts. Totals approximately $1M

25 NACIMIENTO DAM SPILLWAY MODIFICATION PROJECT SUMMARY

26 SALINAS RIVER DIVERSION FACILITY PROJECT SUMMARY

27 Salinas River Diversion Facility

28 General Project Timeline Environmental Approvals EIR/EIS, State, Fed, Local Permits SVWP Ballot Approval 2003 SRDF Design Construction Operation 2010

29 Discussion Blended Recycled Water & Chlorinated River Water to Service Area Recycled Water Plant River Water Chlorination System River Water Screen Station General layout of Salinas River Diversion Facility

30 March 2008

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35 River Water Filter Screen Station River Water Filter Screen Station Prior to Chlorination 1/8/10

36 River Water Chlorination System 1/8/10 Recycled Water Pond River Water Chlorine Injection Building

37 Contract Update All major construction ti activities iti were completed January 15, Operation to begin April Anderson Pacific Engineering Construction, Inc. Contract Amount $11,036,100 Final Construction Cost (Estimated) $13,900, Cost Issues Dam soil foundation

38 Salinas Valley Water Project Manuel Quezada, Senior Water Resources Engineer Chris Moss, Senior Water Resources Engineer Monterey County Water Resources Agency 893 Blanco Circle, Salinas, CA