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CITY COUNCIL AGENDA ITEM NO. 13

Meeting Date: November 13, 2007

Subject/Title: Adopt a Resolution accepting the Wastewater Treatment Plant Expansion Study prepared by ECO:LOGIC Consulting Engineers for the Wastewater Treatment Plant Expansion - Phase II, CIP Project No. 592-59140.

Prepared by: Paul Eldredge, Assistant Director of Public Works/Assistant City Engineer

Submitted by: Bailey Grewal, Director of Public Works/City Engineer

RECOMMENDATION
Adopt a Resolution accepting the Wastewater Treatment Plant Expansion Study prepared by ECO:LOGIC Consulting Engineers for the Wastewater Treatment Plant Expansion – Phase II, CIP Project No. 592-59140.

PREVIOUS ACTION
On August 9, 2005, by Resolution No. 2005-193, City Council authorized the City Manager to execute a Professional Services Agreement with ECO:LOGIC Consulting Engineers in the amount of $101,588, plus a 10% contingency of $10,158.80, for a total amount of $111,746.80, for a facility analysis necessary for the Wastewater Treatment Plant Expansion – Phase II, CIP Project No. 592-59140.

On June 12, 2007, by Resolution No. 2007-126, City Council adopted the City’s 2007/08 – 2011/12 Capital Improvement Program (CIP), which included the Wastewater Treatment Plant Expansion - Phase II, CIP Project No. 592-59140.

BACKGROUND
The existing 5MGD Wastewater Treatment Plant was planned and constructed to accommodate future expansions in phases up to the ultimate capacity of 10MGD to accommodate the proposed General Plan buildout of the City. The next phase of this project will expand the plant to 7.5MGD and the final phase will expand up to the ultimate capacity of 10MGD, if necessary. The first step in the process of expansion is to analyze the current facility and its existing processes to identify and evaluate any required modifications to the existing plant process due to changes in flow characteristics, new technologies as well as anticipated changes in regulatory requirements.

As ECO:LOGIC participated in the design, construction management and startup of the current facility, a professional services agreement was prepared and executed to conduct a plant process optimization analysis to identify and evaluate any required modifications to the existing plant process. This analysis was to focus on a new ultraviolet (UV) disinfection system instead of the current chlorine process, primary and secondary treatment facilities, solids handling, effluent cooling to control the temperature of the treated water being discharged to Marsh Creek and the overall biological process.

The report findings and recommendations were utilized in the preparation of the CIP and Operating Budgets, as well as the Wastewater Rate Study. Procedurally, it was determined that acceptance of this report by City Council should follow the consideration and approval of the CIP and Operating Budgets and the Wastewater Rate Study, as this report’s recommendations would be considered less than significant absent these other approved documents.
The key findings of this study are summarized as follows:

1. The addition of primary clarifiers and anaerobic digesters are not cost effective from a capital costs standpoint or operation and maintenance costs.
2. The secondary treatment system should be converted to the SymBio, or similar process, for simultaneous nitrification and denitrification due to increased solids concentrations at the plant. This conversion reduces the equipment requirements, capital costs, the power costs and allows for easy phasing for the expansion. The required improvements would include new anoxic basins ahead of each of the two existing oxidation ditches.
3. The tertiary filters should be expanded to the planned buildout of eight filter cells.
4. If required by more stringent discharge requirements from the Regional Water Quality Control Board for disinfection byproducts (THMs) and salinity, the sodium hypochlorite disinfection system should be replaced with a new UV disinfection system.
5. Continue with the current solids handling plan; however, a long-term plan should be prepared to produce all Class A biosolids for reuse. The current practice is adequate at this time; however, trends in the industry will require the City to produce Class A biosolids compared to the unclassified biosolids currently produced. In the near-term future, the City should build two active solar dryers to produce Class A biosolids for at least ten (10) percent of its total biosolids production and should develop disposal options suitable for this Class A material. This would be a demonstration project and would be the first step in the plant to eventually produce all Class A biosolids.

In addition to the above, several electrical cogeneration alternatives were evaluated ranging from generators burning digester gas to high-efficiency natural gas generators and fuel cells. Currently, the only impetus for proceeding with an electrical cogeneration project would be to reduce overall operating expenses for the facility; therefore, proceeding with a cogeneration project that is not economically viable would not be warranted. On this basis, the only cogeneration project that would make economic sense is a generator that utilizes digester gas for fuel. However, the economics of this project is not sufficient to be an incentive for constructing anaerobic digesters and modifying the entire plant process. Rather, if anaerobic digesters were constructed for other process reasons, this cogeneration project could make economic sense.

Staff respectfully requests the acceptance of this Wastewater Treatment Plant Expansion Study and will seek further approval should any of these key findings be implemented.

FISCAL IMPACT
There is no direct fiscal impact associated with the acceptance of this study. However, the implementation of these recommendations will have a direct fiscal impact upon the City; for example, design, administration and construction costs. These costs have been incorporated into the approved CIP and Operating Budgets and individual items will be brought back to City Council for consideration prior to any implementation. Although a new UV disinfection system has been included in this report, the City will move forward with the installation of this system only if required by regulatory requirements.

Attachments:
Resolution
Wastewater Treatment Plant Expansion Study

RESOLUTION NO.

A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF BRENTWOOD ACCEPTING THE WASTEWATER TREATMENT PLANT EXPANSION STUDY PREPARED BY ECO:LOGIC CONSULTING ENGINEERS FOR THE WASTEWATER TREATMENT PLANT EXPANSION - PHASE II, CIP PROJECT NO. 592-59140.

WHEREAS, on August 9, 2005, by Resolution No. 2005-193, City Council authorized the City Manager to execute a Professional Services Agreement with ECO:LOGIC Consulting Engineers in the amount of $101,588, plus a 10% contingency of $10,158.80, for a total contract amount of $111,746.80, for a facility analysis necessary for the Wastewater Treatment Plant Expansion – Phase II, CIP Project No. 592-59140; and

WHEREAS, on June 12, 2007, by Resolution No. 2007-126, City Council adopted the City’s 2007/08 – 2011/12 Capital Improvement Program (CIP), which included the Wastewater Treatment Plant Expansion - Phase II, CIP Project No. 592-59140; and

WHEREAS, the existing 5MGD Wastewater Treatment Plant was planned and constructed to accommodate future expansions up to the ultimate capacity of 10MGD; and

WHEREAS, the first step in the process of expansion is to analyze the current facility by conducting a plant process optimization analysis to identify and evaluate any required modifications to the existing plant process; and

WHEREAS, the report was finalized in February 2007 and its findings and recommendations were utilized in the preparation of the CIP and Operating Budgets, as well as the Wastewater Rate Study.

NOW, THEREFORE BE IT RESOLVED that the City Council of the City of Brentwood does hereby accept the Wastewater Treatment Plant Expansion Study prepared by ECO:LOGIC Consulting Engineers for the Wastewater Treatment Plant Expansion – Phase II, CIP Project No. 592-59140.

PASSED, APPROVED AND ADOPTED by the City Council of the City of Brentwood at a regular meeting on the 13th day of November 2007 by the following vote:

 
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