Laserfiche WebLink
ESTIMATED POLLUTANT LOAD REDUCTION : <br /> BMPs Installed Other Other <br /> TSS TP TN Sediment BOD k / r k / r <br /> Canal Treatment kg/yr kg/yr kg/yr kg/yr k91yr <br /> Structure <br /> Pre-Project 9139100 14,500 949300 <br /> w <br /> v <br /> 0 Post-Project 502,100 9,300 739100 <br /> c <br /> B Load Reduction 411 ,000 5,200 21 ,200 <br /> a. % Reduction 45 36 23 <br /> RATIONAL ESTIMATE OF THE THEORETICAL POLLUTANT LOAD REMOVAL <br /> EFFECIENCY BY THE TREATMENT SYSTEM : It is very difficult to estimate the pollutant <br /> removal rates for the bar screen system. For the purpose of this Grant, removals have <br /> been estimated using information presented in the " Final Preliminary Engineering Report - <br /> Vortex Treatment Units and Floating Debris Capture Equipment," November 2003, <br /> prepared for Indian River County by Environmental Consulting & Technology, Inc. The <br /> report states that 25 percent of the total nitrogen (TN ) is associated with particulate matter <br /> and that 40 percent of the total phosphorus (TP) is associated with particulate matter, with <br /> the remainder of these being in the dissolved form . The particulate matter consists of <br /> settelable particles and plant material . Therefore , assume that the pumped sedimentation <br /> basin and the bar screens will remove 90 percent of the TN and TP associated with <br /> particulate matter = 46, 800 lbs per year TN and 11 ,500 lbs per year TP. <br /> With respect to total suspended solids (TSS), assume that the pumped sedimentation <br /> basin will remove approximately 75 percent of the TSS that a vortex treatment system <br /> would remove . Assume that a vortex system would remove 60 percent of the TSS in the <br /> canal water. Therefore, the sedimentation basin is estimated to remove 75 percent of that <br /> 60 percent, or 906 , 000 lbs per year. <br /> A summary of the estimated removal for the proposed treatment system is presented in <br /> Table 1 : <br /> Table 1 - Estimated Pollutant Removal by the Proposed Treatment System in the Main <br /> Relief Canal (Post-construction loadings were extrapolated from the " Final Preliminary <br /> Engineering Report - Vortex Treatment Units and Floating Debris Capture Equipment, " for <br /> Indian River County, prepared November 2003 by Environmental Consulting and <br /> Technology, Inc. ) <br /> TSS TP TN <br /> Post-Construction 2,013, 000 lbs/year 32,000 lbs/year 208,000 lbs/year <br /> Estimated Removal 906 ,000 lbs/year 11 ,500 lbs/year 46 , 800 lbs/year <br /> 45 percent 36 percent 23 percent <br /> DEP Agreement No. GO 182, Attachment A- 1 , Page 7 of 12 <br />