333 S. Meridian, Puyallup, WA 98371 - 253-841-4321

City of Puyallup

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AI- 3695   4.    
City Council Agenda
Meeting Date: 06/04/2013  
Subject:    Biosolids Dewatering Study
Presenter: Don Lange
Department: Public Works  

Information
Recommended Action
Authorize the City Manager to sign a contract with HDR Engineering, Inc. for $74,342 in a form approved by the City Attorney for services related to developing planning-level options of probable cost, operation and maintenance cost, and life-cycle cost for three different biosolids dewatering technologies.
Background
The belt filter press currently used at the Water Pollution Control Plant (WPCP) is a critical piece of machinery that is 30 years old, well beyond the typical 20-year design life. Because of its construction and the environment it operates in, it is structurally deteriorated and requires periodic repairs that affect reliability. This critical piece of machinery is used for removing water from processed biosolids before the material is transported off-site. Removing as much water as possible minimizes the number of truck loads removed and thus transport and disposal costs.
Previous Actions (Discussions/Presentations)
A request for consultants to submit Statement of Qualifications was published on March 27, 2013 and April 3, 2013. Three proposals were received on April 26, 2013 and subsequently rated by the Public Works Director, City Engineer, WPCP Manager, WPCP O&M Supervisor, and the Superintendent of Sumner's WWTP. The proposal submitted by HDR Engineering, Inc. received the highest rating.  
Summary of Proposal
This is the planning level effort of a multi-year dewatering improvement project that will subsequently progress through design and construction.
Alternatives/Options
This proposal evaluates the cost of three current dewatering technolgies: rotary press, screw press, and centrifuge in three potential plant locations. It also evaluates opportunities for improved material handling as well as the life-cycle equipment costs and necessary appurtenances, and non-economic issues such as constructability and risks.

Fiscal Impact
Amount Budgeted: $75,000
Bid Amount: $74,342
City Funding Needed for Project: $74,342
Funds from Other Sources: 0
Ongoing Staff Costs: 0
Fiscal Impacts:
Current dewatering practice is to operate two to three times each week. Each operating episode takes between 24 and 30 consecutive hours and requires staffing. Because of the simplicity, slow speed, and automation available with newer dewatering technologies, a properly designed and automated system may reduce staffing requirements.

This expenditure was approved in the adopted 2013 Sewer CIP budget and funds are allocated from the Sewer Fund. 

Attachments
HDR Study

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