EXHIBIT 7-A
Implementation Plan
Water Project 5
Increasing Capacity at Los Padres Dam
In this project, two
scenarios would be examined:
Dredging in
order to restore an original water right.
Original
Water Right (1948) 3,030 AF
Current
Right (reduced by Order 95-10) 2,179
AF
Restored
Right 851 AF
Estimated
Storage 1,775
AF
Sediment
Removal Required to Restore 1948 Right 1,255 AF
3,030
AF
Additional
water provided for stream flow: 404 AF (1,255 minus 851)
A seasonal rubber dam and
transfer a portion of District’s 20808 Water Right.
The
existing spillway is 18 feet below the dam height. It is contemplated that 5 to 10 feet of
height can be added during certain times of the year to increase storage
without inundating the Ventana Wilderness.
This would provide 340 AF to 680 AF of new capacity. It is recognized that spillway modifications
and widening may be required, as will enhanced fish passage.
Work Plan Tasks
Assumes
starting once Board approves a course of action. Timeline will
need to factor in approval dates, preparation of bids, and bidder response
time.
Task 1: Dredging
Feasibility Study
Budget: $200,000
Timeline: 6 months
Task 2: Preliminary
Design
A consulting engineer will be
hired to develop conceptual layout, sizing, and costs for a prospective rubber
dam, including any required alterations to the spillway, as well as fish
passageway redesign.
Budget: $50,000 - $100,000
Timeline: 2 months
Task 3: Dam
Feasibility Study
Geotechnical investigation of
the dam, spillway, and adjacent area to determine ability to accommodate rubber
dam; Seismic
stability review of dam, spillway, and adjacent embankment; and hydrology for
maximum flood and routing through reservoir.
Budget: $150,000 - $200,000
Timeline: 4 months
Task 4: Develop
Detailed Project Description
Consultant will identify and
carry out additional field studies that are needed to further refine the
project. Finalize the project
description for the EIR, including site layout, dewatering and disposal plan,
and new facilities to be constructed. Cost estimates will be prepared.
Budget: $40,000 - $80,000
Timeline: 4 months
Task 5: Prepare
Environmental Impact Report
An Environmental Impact
Statement will be prepared to satisfy the CEQA process.
Budget: $250,000 - $500,000
Timeline: 12 months
Task 6: Detailed
Design and Construction Bid Documents
Assumed at
10% of construction.
Budget: $7,823,000
Timeline: 18 months
Task 7: Permitting
and Environmental
Budget: $250,000 - $300,000
Timeline: 20 months, overlaps with Detailed Design
Task 8: Construction
and Start-Up
Dredging:
1,255
acre-feet = 2,024,315 cubic yards.
Using
1996 Moffat study updated to current dollars:
$41,062,000 to $78,839,000
Using
USBR report for dredging and transport:
$24,292,000 to $60,730,000
Average
of all 4 figures: $51,230,000
Fish Passage
Improvements: $15,000,000
Rubber Dam and Spillway
Improvements: $12,000,000
Budget: $78,230,000
Timeline: 22 months
Summary of Estimated Costs (DRAFT)
Task 1: Dredging Feasibility Study Task 2: Preliminary Design Task 3: Dam Feasibility Study Task 4: Develop Detailed Project Description Task 5: Prepare Environmental Impact Report Total Preconstruction Costs |
$200,000 $50,000 - $100,000 $150,000 - $200,000 $40,000 - $80,000 $250,000 - $500,000 $690,000 - $1,080,000 |
|
|
Task 6: Detailed Design and Construction Bid
Documents Task 7: Permitting and Environmental Task 8: Construction and Start-Up Total Construction Costs |
$7,823,000 $250,000 - $300,000 $78,230,000 $86,303,000 - $86,353,000 |
Unit Cost
Annual cost of operation,
maintenance, and desiltation program: $900,000
Annualized capital cost (30
years; 5%) $5,673,500
Total Annual Cost $6,573,500
Cost per AF (assuming 851AF
from dredging and 680 AF from dam) $4,294
Dam and Fish Passage Only:
Annual cost of operation,
maintenance: $150,000
Annualized capital cost (30
years; 5%) $1,977,000
Total Annual Cost $2,127,000
Cost per AF (assuming 680 AF
from dam) $3,128
Dredging Only:
Annual cost of operation,
maintenance, and desiltation program: $750,000
Annualized capital cost (30
years; 5%) $3,712,000
Total Annual Cost $4,462,000
Cost per AF (assuming 851AF
from dredging) $5,243
Note: Capital costs for projects separated will add
up to slightly more than the combined project due to efficiencies when
combined.
Estimated Timeline
Timeline assumes start is
delayed to next fiscal year. See next
page.
U:\staff\word\committees\WaterSupply\2011\20111122\07\item7_exh7a.docx