MANASOTA & PEACE RIVER BBDs Meeting Notebook 10-21-09.docx

W794
Winter Haven Chain of Lakes Sediment Removal Feasibility Study
Critical Project Milestones Projected Amended Actual
1. Contract Development and Execution
City of Winter Haven approve agreement 4/15/05 2/22/05
District approve agreement 6/15/05 3/4/05
Notice to proceed sent for agreement 8/15/05 3/9/05
2. Project Phases
Phase I Organic Sediment Study Complete 8/30/06 2/27/07 3/30/07
Phase II Feasibility Study Complete 12/30/06 12/31/07 3/30/07
Final report submitted 8/30/07 11/18/09
3. Agreement Expiration Date
Contract Expiration 12/31/07 1/31/10
Status As Of: August 28, 2009
The City's consultant collected water and sediment quality and hydrologic data in Lakes May, Shipp and Lulu from
August 2005 to June 2006 to develop water and nutrient budgets that were used to calibrate water quality models for
each of the lakes. The model was then used to evaluate potential improvement of in-lake water quality by removing
sediments from the lakes. The final report for Phase I was received in June 2007 and recommended that sediments be
removed from Lake May and sediments in Lakes Shipp and Lulu be treated with alum to prevent nutrient influx into the
water column. The preliminary cost estimate for sediment removal and inactivation in the three lakes was $7.4 million. In
May 2008, the City's consultant recommended a revision to the original proposal that exceeded the amount of funds
remaining in the cooperative funding agreement. Lakes May and Shipp were identified as priorities for additional data
collection and the total proposed cost for the enhanced data collection is approximately $65,000. The City agreed to
cover the costs above the amount remaining in the cooperative funding agreement. The District approved the scope of
work and the consultant began collecting groundwater seepage data and data related to sediment phosphorus release.
This data collection was to have been completed by January 2009. However, the consultant extended the data collection
at his own cost to improve the data set. As of the last write up, the City and its consultant anticipated collecting additional
data through July 2009 in an attempt to gather data during a period when the sediments become anoxic. Due to some
delays with the sampling equipment, the City and its consultant plan to sample through October 2009. The City has
pledged that they would cover any additional costs as they believe the data will be useful for the Winter Haven Chain of
Lake Water Quality Management Plan (W796). The City requested a no cost time extension to allow for the additional
data collection and completion of the final report. The Second Amendment to the Agreement to allow for the no cost time
extension was fully executed prior to the expiration date of the agreement. The updated schedule is reflected in the
milestones section of this write-up.
020 - Peace River Basin 72