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<br />Manufacturer Model Flow, MGD Manufacturer Cost1,2 <br />Mensch Crawler Vulcan 7.0 $175,000 <br />USFiher/Envirex Series 1000 Rex 7.0 $70,000 <br />ConClimber 206.08 Conclimber Screen 7.0 $100,000 <br /> . <br /> <br />Tablet. Bar Screen Alternatives <br /> <br />Cost does not Include InstallatIOn <br />2 Cost is for two bar screens <br /> <br />As stated previously, the Pretreatment Building had major improvements constructed in <br />2000. Howard R. Green Company recommends the City choose equipment that meets <br />clearance requirements of the existing building. The US FilterfEnvirex bar screens fit the <br />proposed channels and would require minor adjustments to equipment suspended ITom the <br />ceiling. The Conclimber bar screens fit in the building with adequate clearance if the <br />discharge height is low. The Mensch Crawler screens would require major modifications to <br />the Pretreatment Building due to inadequate climber clearance. All building adjustments <br />would be confirmed during final design. <br /> <br />Slide gates would be installed into the channels to direct flow into one bar screen or the <br />other, allowing for maintenance of the isolated bar screen while flow is diverted. A slide <br />gate is needed both upstream and downstream of each bar screen. <br /> <br />Grating wou1d be installed over existing and new flow channels. The grating provides a safe <br />surface for staff to walk across, but still allows easy access to the channels. The entire length <br />of the channel would be covered except at the bar screen and slide gates. Hinged grating <br />wou1d be provided to allow maintenance in areas where access is routinely required. <br />Additionally, guardrail is required around both mechanical bar screens and would be <br />installed for safety. <br /> <br />PARSHALL FLUME IMPROVEMENTS <br /> <br />The Parshall Flume has a flow capacity of 10.4 MGD, which exceeds the design peak flow of <br />7.0 MGD. Replacement ofthe flume is not necessary to meet the flow capacity, but minor <br />improvements should be made. The crack in the floor near the flume should be filled and <br />sealed. It is recommended that the Parshall Flume be fully inspected during renovations to <br />the Pretreatment Building. The flume may need to be replaced if its condition has <br />deteriorated significantly. <br /> <br />INFLUENT SAMPLER <br /> <br />The influent sampler is in acceptable condition and does not need replacement. Composite <br />samples are taken by the sampler based on flow-weighted sampling, which takes place at <br />preset intervals based on flume measurements. If the flume is replaced, the sampler needs to <br />be recalibrated. <br /> <br />6 <br />