Memorandum
City of Lawrence
Utilities Department
|
TO: |
David L. Corliss, City Manager Diane Stoddard – Assistant City Manager Casey Toomay – Assistant City Manager |
|
FROM: |
Andy Ensz, Utilities Project Engineer |
|
CC: |
Dave Wagner, Director of Utilities Mike Lawless, Deputy Director of Utilities Philip Ciesielski, Assistant Director of Utilities Aurora Shields, Water Quality Manager Beth Krishtalka, Assistant to Director Mark Hegeman, Utilities Operations Superintendent |
|
Date: |
September 30, 2014 |
|
RE: |
October 14, 2014 Agenda Item – Authorize the City Manager to Execute a Supplemental Agreement in the amount of $1,260,880.00 with Burns & McDonnell for Engineering Services for Phase 1 Process Improvements for Project UT1209 – Taste and Odor, and Algal Toxin Water Treatment Process Evaluation |
Background
The generation of taste and odor compounds and algal toxins in the City of Lawrence, KS raw water sources has occurred periodically. These sources are surface water from the Clinton Reservoir and Kansas River. There is small contribution of Kansas River alluvial well water. At present, the sources are separate and treated at plants dedicated to each. Clinton Reservoir water is treated at the Clinton Water Treatment Plant, and Kansas River surface and well water is treated at the Kaw River Water Treatment Plant. Both plants generally employ presedimentation, powder activated carbon addition, lime softening, disinfection by sodium hypochlorite and dual media filtration.
The current treatment plant processes provide sufficient reduction of geosmin for most events of record to produce finished water below the taste sensitivity of most humans. The most recent event at Clinton Lake occurred in August 2013. Another event, which persisted for about ten days during June 2012, had raw water geosmin levels that exceeded any previous event of record by nearly four times. The inability of the current treatment process to remove these high levels of geosmin resulted in customer calls regarding the taste and odor of the drinking water.
Presently, algal bloom events related to the generation of geosmin, MIB and/or algal toxins are not well understood. The City of Lawrence is currently working with United States Geological Survey, the US Army Corps of Engineers and other area utilities in several scientific studies to understand these events and attempt to predict their future frequency and severity.
The purpose of the project was to evaluate drinking water treatment processes that will enhance the removal of taste and odor compounds, microtoxins and viruses at the Clinton and Kaw water treatment plants. The scope of the work included water testing and analysis; evaluation of existing plant processes; evaluation of additional treatment processes, and existing process modifications; estimated capital, and operational and maintenance costs of proposed options; and the present worth value of the proposed options. Treatment options evaluated included advanced oxidation, filtration, and adsorption technologies.
Project History
On August 21, 2012 the City Commission authorized staff to advertise an RFP for Engineering Services for Project UT1209 – Taste and Odor, and Algal Toxin Water Treatment Process Evaluation.
On December 3, 2012 the City Commission authorized staff to negotiate an Engineering Services Agreement with Burns & McDonnell for the project.
On March 12, 2013 the City Commission authorized the execution of an Engineering Services Agreement with Burns & McDonnell in the amount of $137,128.00 for Project UT1209 – Taste and Odor, and Algal Toxin Water Treatment Process Evaluation.
On May 20, 2014 the City Commission authorized staff to negotiate a Supplemental Agreement with Burns & McDonnell for Engineering Services for Phase 1 Process Improvements for Project UT1209 – Taste and Odor, and Algal Toxin Water Treatment Process Evaluation.
Project Status
The City of Lawrence contracted with Burns & McDonnell in 2013 to conduct a study evaluating the capability of both the Kaw and Clinton Water Treatment Plants (WTP) to reduce taste and odor (T&O) causing compounds. As part of the study, a number of improvements to existing processes were recommended to improve T&O mitigation at the Clinton WTP. These recommendations include addition of a new rapid mix system, carbon dioxide system, ferric system, liquid lime system, and tube settlers in some of the basins. A new lime system was also recommended for the Kaw WTP, not to improve T&O treatment, but to provide a higher quality lime and reduce operational costs.
This project incorporates all of the recommendations from the 2013 study as well as some additional scope items requested by the City, including painting of the South Train basins at the Clinton WTP, miscellaneous painting at both WTPs, operator training, and post construction process testing and optimization.
Staff Recommendation
Staff recommend proceeding with the Phase 1 process optimization improvements for both the Kaw and Clinton WTPs outlined below at a total estimated project cost of $8,100,000.00.
|
Kaw WTP |
|
|
Lime Slakers |
$1,420,000.00 |
|
Lead Paint Removal and Recoating of Lime Feed Room Floor Chemical Feed Silo Recoating Dust Collectors and Bin Vibrators |
$1,170,000.00 |
|
Clinton WTP |
|
|
CO2 System |
$1,310,000.00 |
|
Liquid Lime System |
$780,000.00 |
|
Ferric Chloride System |
$400,000.00 |
|
Tube Settlers Presed |
$970,000.00 |
|
Tube Settlers Primary |
$650,000.00 |
|
Rapid Mixers |
$350,000.00 |
|
Lead Paint Removal and Recoating of South Train Basins and Sludge Building New Ferric Building |
$1,050,000.00 |
|
Estimated Total Project Cost |
$8,100,000.00 |
Burns & McDonnell provided a scope of services and fee to provide engineering services for the Phase 1 process improvements. The fee to provide these services is $1,260,880.00.
The Design Services portion of the fee is $619,500.00. The table below reflects the proposed fee components in relation to estimated construction costs.
|
Estimated Construction Cost |
$6,839,120.00 |
|
Basic A/E Cost (% Const) |
$619,500.00 (9.0%) |
|
Non-Basic A/E Cost (% Const) |
$641,380.00 (9.4%) |
|
Total ESA Cost (% Const) |
$1,260,880.00 (18.4%) |
|
Fee Curve Recommendation (% Const) |
Up to 6.99% |
The Design Services portion of the ESA as a percentage of total construction cost is higher than the 6.99% guideline published in the City of Lawrence Design Fee Guidelines; however, this design involves a number of items that add to the complexity of the project including: renovations to existing structures; required continuous operations; specialized construction methods or system process design; and work at multiple project sites.
The table below compares the fee components as a percentage of construction cost with several previous Department of Utilities treatment plant projects.
|
Project |
Basic |
Non-Basic |
Total |
|
Taste & Odor Improvements |
9.0% |
9.4% |
18.4% |
|
Kaw WWTP Expansion |
7.2% |
9.9% |
17.1% |
|
Clinton WTP Expansion |
6.7% |
9.4% |
16.1% |
|
Kaw WWTP Digester |
8.7% |
7.1% |
15.8% |
Several construction phase and post-construction phase services were added to the scope of this project that were not included in the previous projects compared above. The services will provide a better operational understanding and include: an Operational Narrative document to supplement the O&M manuals; training sessions with the Consultant, Contractor, equipment manufacturers, and plant operations staff; post-construction plant performance evaluation. The fee for these additional services is $67,518.00 and accounts for approximately 1% of design fee components.
This project will provide many benefits to the City of Lawrence, including better removal of T&O causing compounds and optimized processes at the Clinton WTP, reduced annual chemical costs at both WTPs, and preparation for future treatment challenges.
Project Funding
The 2014 CIP includes funding for a portion of the Phase I improvements with the remainder of the improvements included in the Department of Utilities recommended 2015 CIP and Rate Plan.
Action
Authorize the City Manager to Execute a Supplemental Agreement in the amount of $1,260,880.00 with Burns & McDonnell for Engineering Services for Phase 1 Process Improvements for Project UT1209 – Taste and Odor, and Algal Toxin Water Treatment Process Evaluation.