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ODOR CONTROL STUDY Other Minor and Transient Sources Improvements • Improve the ventilation in the bar screen dumpster area so that the garage doors can remain closed . Improved ventilation could be accomplished when the Anoxic Tanks are covered and ventilated . The ventilated air could be added to the Anoxic Tank biofilter at a construction cost of approximately $ 80 , 000 . • Openings that exist at slide gates and bar screens on top of the Headworks Structure should be closed with rubber gaskets . The cost for these gaskets is estimated to be less than $ 1 , 000 , assuming County personnel install the gaskets . • The existing grit removal units , dumpsters , and mechanical sludge thickener are the most difficult transient odor sources to control . No improvements are recommended for these sources at this time because they are expensive to cover and few emissions are likely to be controlled . The addition of a local meteorological station (wind speed and direction ) is recommended for the RSF . Data and information from the local meteorological station could be used to make decisions when not to operate these facilities . The cost for a local meteorological station is estimated to be approximately $ 15 , 000 Dewatering Building Improvements • Ambient H2S was measured by the Jerome meter at concentrations between 0 , and 6 ppmv inside the Dewatering Building . H2S measurements were highest near the belt filter presses and the belt filter press sumps . The new belt filter press hoods will probably reduce fugitive emissions in the Dewatering Building . However, open grating over the filtrate sump will likely allow significant emissions to continue to escape into the Dewatering Building . It is not known how ambient H2S concentrations will be affected by the new hoods and open sumps . • The belt press filtrate sump could be eliminated or covered . Piping changes could be made to the belt filter press drains and/or aluminum plates could be used to cover the sumps . Construction and engineering costs for these improvements are estimated to be less than $20 , 000 , assuming County maintenance personnel make these improvements . Proposed Improvement Budget and Schedule Provided below is a summary of a proposed conservative budget for all of the above recommended improvements : :9 III Indian River County, Central Wastewater Treatment Facility PBSW #071230, February 2003