Upper and Lower Five Coves Rehabilitation Project

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AGENDA ITEM SUBMITTAL Meeting Date: April 10, 2013 Budgeted: Yes Budgeted Amount: $600,000 To: Water Issues Committee Cost Estimate: $250,000 Board of Directors Funding Source: R&R, FEMA Program/Line Item No. R11015 From: Mike Markus General Counsel Approval: Yes Engineers/Feasibility Report: Yes Staff Contact: J. Kennedy, CEQA Compliance: Yes S. Scott-Roberts Subject: REQUEST FOR PROPOSALS FOR DESIGN OF THE SANTIAGO BASINS SADDLE REPAIR PROJECT SUMMARY The Santiago Basins (Blue Diamond and Bond Basin) were connected by a pipeline located in the berm that separates the two basins, otherwise known as the saddle. During the 2010-11 storm season, the pipeline and a portion of the saddle were washed out. The saddle in its current condition has several unstable slopes. OCWD would like to repair this washed out saddle to provide stability to the facilities above and to provide additional water for recharge during the summer months. Therefore staff recommends issuing a Request for Proposals for design of the Santiago Basins Saddle Repair Project. Staff expects a larger percentage of this project cost to be reimbursed by the Federal Emergency Management Agency. Attachment(s): Request for Proposals RECOMMENDATION Agendize for April 17 Board meeting: Authorize issuance of Request for Proposals for engineering services for design of the Santiago Basins Saddle Repair Project BACKGROUND/ANALYSIS Orange County Water District (District) bought the Santiago Basins in 1990. The Santiago Basins are located in the City of Orange, City of Villa Park, and in unincorporated areas of Orange County. The basins consist of two sand-gravel pits referred to as Bond Basin (south basin) and Blue Diamond Basin (north basin). Figure 1 shows the configuration of these basins. Upon purchase, Blue Diamond and Bond Basin were separated by a dirt berm. The District excavated the narrowest portion of the separating berm down to elevation 245, referred to as the “saddle”, and installed a corrugated metal pipe within the saddle at elevation 230. During the winter of 2010-11, the rains washed out the corrugated metal pipe and eroded parts of the saddle. The storm left some steep unstable slopes around the saddle area. These slopes need to be maintained so that the erosion doesn’t continue and wash out facilities and roads on top of the berm.
Saddle Area The District dewatered the basin in 2012 to have a topographic map made of the storm damage. The District is now looking to repair and stabilize the eroded slopes. The District would also like to grade the saddle to minimize future erosion potential and lower the saddle top elevation to allow for more water to come into Bond Basin during draining. The District has a pump station in Bond Basin that can be used to pump water to various facilities for recharge. Figure 2 shows a cross section of both basins and the current saddle elevation. If the saddle elevation is lowered, more water from Blue Diamond will be able to be pumped out of Bond Basin to recharge basins for recharge. However, the water level in Blue Diamond cannot be dropped drastically due to the 21- foot diameter inlet from the Orange County Flood Control District which is located on the north end of Blue Diamond and runs underneath Villa Park Road. If the water level in Blue Diamond is too low, the water will cascade from the 21-foot inlet into Blue Diamond basin erode the inlet. Improvements to the Santiago Basins would include stabilizing the eroded dirt slopes to protect the roads and facilities above them, evaluating the optimal berm level to provide additional water for recharge while still maintaining a pool of water for the inlet at Blue Diamond, and developing a monitoring plan for ensuring the slopes around both basins remain stable. Therefore as part of the Request for Proposals (RFP) for the design of the Santiago Basins Saddle Repair Project staff is asking consultants to Evaluate eroded slopes and banks around the Santiago Basins and recommend at least three repair alternatives
Page 1 and 2: AGENDA WATER ISSUES COMMITTEE MEETI
Page 3: WATER ISSUES COMMITTEE MEMBERS Cath
Page 6 and 7: 3/13/2013 4. Contract No. W-2013-1:
Page 8: 3/13/2013 10. Proposed Fiscal Year
Page 11 and 12: performed by Black & Veatch reveale
Page 13 and 14: NOTICE INVITING BIDS BURRIS PUMP ST
Page 15: SHEETING, SHORING AND BRACING: Purs
Page 18 and 19: The items that have been identified
Page 20 and 21: 3/17/2010 - R10-3-00: Authorize iss
Page 22 and 23: guarantee period as specified in th
Page 24 and 25: Upper and Lower Five Coves Rehabili
Page 26 and 27: Project Scope 1. Off River transfer
Page 28 and 29: 2. SAR 60” Intertie
Page 30 and 31: 4. Five Coves Transfer
Page 32 and 33: Project Schedule Description Date A
Page 34: Recommendation • Agendize for Apr
Page 39 and 40: Clearinghouse #2012011053); and ado
Page 41 and 42: REQUEST FOR PROPOSALS FOR THE SANTI
Page 51: EXHIBIT B OCWD PROPOSAL EVALUATION
Page 54 and 55: The Board approved participation in
Page 57 and 58: AGENDA ITEM SUBMITTAL Meeting Date:
Page 59 and 60: CAPITAL IMPROVEMENT PROGRAM The fis
Page 61 and 62: Orange County Water District FY 201
Page 63 and 64: FY 2013-14 Budget Schedule Date Mee
Page 65 and 66: Summary of Proposed 2013-14 CIP •
Page 67 and 68: FY2013-14 CIP Projects Continued Pr
Page 69 and 70: GWR System Initial Expansion • Co
Page 71 and 72: Mid Basin Injection Demonstration P
Page 73 and 74: Alamitos Barrier • Construction o
Page 75: Action Provide comments and directi
Page 78 and 79: Due to the tight federal budget, Co
Page 80 and 81: Accelerated Funding for Prado Basin
Page 82 and 83: Alternatives Evaluated in Feasibili
Page 84 and 85: Feasibility Study Funding • 50/50
Page 86:
Recommendation • Agendize for Apr
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Upper and Lower Five Coves Rehabilitation Project

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