Specifications include, but are not limited to: SCOPE OF SERVICES: The City of Clearwater (City) has received Southwest Florida Water Management District (SWFWMD) Environmental Resource Permit (ERP) #44-22515-7 to remove the existing alum treatment system within Town Pond and to modify the pond. Per the approved construction plans, the accumulated alum floc, or sludge, in the pond must be removed and disposed of properly and legally. The sludge is a result of the alum attaching to certain elements and suspended particles and settling to the bottom of the pond for stormwater treatment. This scope is for the removal and disposal of the sludge and any associated temporary measures, but not for any other pond modifications. Figure A shows the location of Town Pond. Figure B shows the approximate area of sludge in the pond (this area is the normal water level area). Based on sludge depth measurements throughout the pond in October 2011, it is estimated that there is an average of approximately 1.8 feet of sludge covering the bottom of the pond at an area of approximately 3.5 acres. It is estimated that the pond contains approximately 10,257 cubic yards of sludge, at 19.5% solids in-place (based on the initial analysis). See Figures C, D, and E. All sludge is to be removed, regardless of depth of pond and thickness of sludge layer, to the satisfaction of the City. The initial analysis used the average sludge thickness and assumed a dewatered solids percentage of 46%, making the estimated dewatered volume of material to be removed from the project site approximately 4,285 cubic yards. Note: the sludge depth, coverage, and other parameters are not guaranteed. The contractor is invited to estimate/measure the quantity and qualities of the sludge for his/her own use. Six (6) samples of the sludge from different areas of the pond were obtained and analyzed in October-November 2011. Toxicity characteristic leaching procedure (TCLP) tests were run on the samples to determine if the sludge could be disposed of in a landfill. Those results are attached in Figure F. They are not guaranteed and are to be used at the risk of the contractor. The contractor is invited to sample and analyze the sludge for his/her own use. The sludge may be dewatered on the Town Pond property, just south of the pond in an area that contains an existing drainage inlet. This will allow water to return to the pond without additional stormwater treatment. See Figure B for dewatering location.2 Although TCLP tests were run on prior samples and a Tencate Geotube analysis (Figure E) was run on the sludge quantities, the contractor is invited to use any means he/she feels necessary to analyze, estimate, remove, dewater, and dispose of the sludge. Disposal proposals that discharge into the Citys sanitary sewer system or transport sludge to any of the Citys wastewater treatment plants will not be considered. After sludge has been removed from the pond, the City reserves the right to have the pond inspected by a 3 rd party diver to determine the extent of the sludge removal. The diver shall inspect the locations noted on Figure C and random other locations in the pond. If the sludge has not been removed to the satisfaction of the City, the contractor shall continue the sludge removal process with no additional cost to the City, including costs related to reinspection by the 3 rd party diver.
