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ITEM: |
CONSENT
CALENDAR |
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6. |
Consider Authorizing an Amendment to the Agreement
for Services for the Los Padres Dam and Reservoir Alternatives Study |
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Meeting
Date: |
April 16, 2018 |
Budgeted: |
No |
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From: |
David J. Stoldt
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Program/ |
Water
Supply Projects |
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General
Manager |
Line Item
No.: |
1-1-2 |
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Prepared
By: |
Larry
Hampson |
Cost
Estimate: |
$141,000 (potential 50%
reimbursement) |
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General Counsel Approval: N/A |
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Committee Recommendation: The Administrative Committee reviewed this item on April 9, 2018 and recommended approval. |
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CEQA Compliance: This action
does not constitute a project as defined by the California Environmental
Quality Act Guidelines section 15378. |
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SUMMARY: The District and Cal-Am are working cooperatively to develop a comprehensive long-term management plan for Los Padres Dam and Reservoir. The District has entered into an agreement with AECOM, Inc. for $560,000 to carry out an alternatives study for Los Padres Dam. As described in Exhibit 6-A, AECOM is requesting an increase of just over $140,000 in the contract amount to account for services that are outside of the scope of the original agreement and to account for unexpected delays in project work. District staff have requested that California American Water consider reimbursing the District for up to 50% of the cost of these added tasks.
RECOMMENDATION: Authorize the General Manager to amend an existing agreement with AECOM, Inc. for the Los Padres Dam alternatives study to increase the not-to-exceed amount by $141,000.
DISCUSSION: The budget request deals with expenditures that are outside of AECOM’s original scope of work and that are mostly unanticipated costs. The costliest item relates to analysis of the 1947 reservoir topo that was found to be flawed and incorporation of new data that are important to the question of sediment transport and effects. There are also additional costs associated with the involvement of CDFW and NMFS in the analysis and work products completed by AECOM.
The 1947 topography by Cal-Am’s predecessor (California Water and Telephone) was found to be in error by overstating the valley width by about 50 feet along a significant portion of the reservoir. This error resulted in overestimating the original capacity of the reservoir by about 10% or about 300 acre-feet (AF). This has some effect to the dam alternatives analysis, both on the long-term siltation rate at the reservoir and in determining how much storage capacity could be recovered at the reservoir through dredging.
Shortly after AECOM and MPWMD entered into an agreement for services, the extremely wet winter of 2017 resulted in another slug of sediment from the upper watershed entering the reservoir. California State University at Monterey Bay was asked by the District to conduct a follow-up bathymetric survey to the one carried out in 2016. The 2017 survey confirmed a loss of about 4.5% of original storage capacity or about 130 AF. Results from the survey need to be incorporated into an updated summary of the siltation rate at the reservoir.
Evaluation of dam alternatives has become more complex as the Technical Review Committee set up to guide the effort evaluates fish passage alternatives and tries to understand how those alternatives might affect the decision about the long term fate of Los Padres Dam. Both the National Marine Fisheries Service and the California Department of Fish and Wildlife have consistently asked for additional information and time to review the various technical memos and recommendations from both AECOM, the consultant for the dam alternatives analysis, and HDR, the consultant for the fish passage alternatives analysis that have resulted in delays to both studies.
IMPACT TO STAFF/RESOURCES: Funds for this contract amendment would be included in the FY 2018-19 budget. Staff has asked Cal-Am to reimburse the District for up to 50% of this cost.
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