ADOPTED BUDGET RESOURCE ALLOCATION PLAN - City of ...

Project: 825521 Pond Sediment Removal
Origination Year: 2005-06
Planned Completion Year: 2014-15
Department: Public Works
Project Description / Scope / Purpose
Project Information Sheet
Type: Wastewater
Category: Infrastructure
Project Manager: Hira Raina
Fund: 465 Wastewater Management Fund
Sub-Fund: 300 Wastewater Infrastructure Subfund
Project Coordinator: Dan Hammons
The project provides funding for sediment removal from oxidation ponds at the Water Pollution Control Plant (WPCP). The oxidation ponds provide secondary treatment using natural action of
sun and wind to facilitate the growth of algae, which takes up dissolved waste from the wastewater. No solids have been removed from the ponds since inception of secondary treatment in the late
1960’s. The current accumulation of solids is estimated at 35% to 45% of the pond volume. A pilot study recommended the removal of 26,000 dry tons at a unit cost of $540 per dry ton. This fiveyear
project will remove approximately 5,000 dry tons, or 20%, of the recommended removal. Funding also provides for site improvements for staging and provision of electricity and water
necessary to accomplish the project. Removal of the total recommended 26,000 dry tons is estimated at $14 million.
Design process for the infrastructure component of this project is currently underway and expected to be completed in FY 2008/09. This project is phased to be completed in bi-annual contracts
incorporating funding from two budget years. This rate of removal has been determined to be the least disruptive to ongoing operations at the WPCP. This also allows the project to move forward in
parallel with the WPCP Strategic Infrastructure Plan (SIP), which is in progress. This phasing also allows us to terminate the process in the unlikely event the SIP determines the ponds will not be
utilized in the future.
Project Evaluation and Analysis
Work to remove solids should be initiated as soon as possible to mitigate risks such as exceeding ammonia limits. Alternative solutions were evaluated as part of the engineering work completed to
date. Alternatives included purchasing the necessary equipment and accomplishing the work in-house vs. contracting the work out, as well as off-site disposal vs. disposal at the biosolids monofill at
the Sunnyvale Landfill. Contracting out and utilizing all three disposal options to confirm projections and minimize future costs were determined to be the best approach. Financial justification for
the project is avoidance of violations and fines and construction costs that often escalate faster than the general rate of inflation. Postponing this project poses the definite risk of increased costs and
potential risks of violations (air and water quality) and resulting fines.
Fiscal Impact
This project will be funded from Wastewater Revenues. Cost estimates are based on costs from the pilot study and subsequent evaluation of alternatives, and include labor, materials and
contingencies. Operating costs will not change based on completion of the project. It is anticipated that completion of the project will result in no further need for removal. The SIP will address the
need and expected cost for this work beyond FY 2013/14.
Project Financial Summary
Financial Data Prior
Actual
Project Costs
Revenues
Total
Transfers-In
Total
Operating Costs
Current 2010-11 2011-12 2012-13 2013-14 2014-15 2015-16 2016-17 2017-18 2018-19 2019-20 Y11-Y20
2009-10
Total
Project
Life Total
88,390 1,162,611 1,652,372 1,727,687 1,803,757 1,865,426 1,017,383 0 0 0 0 0
0 9,317,626
0 0 0 0 0 0 0 0 0 0 0 0
0 0
0 0 0 0 0 0 0 0 0 0 0 0
0 0
0 0 0 0 0 0 0 0 0 0 0 0
0 0
Pond Sediment Removal 825521