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Task 2 - Source Sample Collection and Analysis of Air Samples <br />A. Using the existing design data and drawings, PBS&J will develop and conduct a source - <br />sampling program that will seek to measure odor and sulfide emissions from the sources <br />considered most important. Grab samples will be collected to measure odor emissions. Gas <br />chromatographic/mass spectrometer (GC/MS) technique will be used to measure common <br />reduced sulfur compounds as indicated in the sample analysis form included at the end of the <br />scope. <br />B. It is assumed that the sampling program will involve one sampling event. The sampling <br />event will occur to measure existing emissions, in order to establish an estimate of emissions <br />before certain improvements are made to the existing facilities. The sampling event will <br />consist of one day of travel and equipment set-up and sample collection. No more than <br />ten(10) samples will be collected and analyzed for sulfide compounds and odor <br />characterization during the sampling event The number and location of samples are <br />estimated as follows. <br />Sample Event No. 1 <br />Sample <br />Sample Location Number Type <br />Headworks Odor 2 Point <br />Control System <br />Grit Dumpster I Grab <br />Upstream of Screens 1 Grab <br />Anaerobic Tank 2 Grab <br />First Anoxic Tank 2 Grab <br />Sludge Scrubber 1 Point <br />By the RIBS 1 Grab <br />Comments <br />In and out - durint; normal operation <br />None <br />Influent Box <br />Inlet/outlet <br />Inlet/outlet <br />Scrubber Discharge <br />Sample at the boundary <br />C. The County will assist PBS&J during the set-up and sampling by operating all equipment, <br />systems and processes in a normal manner. The County will also facilitate access to <br />locations to be sampled. <br />Task 3 — Odor Data Evaluation <br />A. PBS&J will use the collected emission data to estimate the mass sulfur- and odor emission <br />concentration for each sampled source. The sources will then be prioritized according to the <br />estimated total mass emissions. <br />B. PBS&J will also identify and evaluate appropriate air collection and odor control system for <br />the each measured source at each WWTP. PBS&J will also evaluate potential controls or <br />process modifications which might reduce odor emissions. Cost estimates will be developed <br />for each odor control option evaluated. <br />2 <br />