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PROPOSAL FOR PROFESSIONAL SERVICES <br />CITY OF NORTH OLMSTED consultants <br />LEBERN DRIVE, DOVER CENTER ROAD, AND <br />CLAUGE PARK PUMP STATIONS' IMPROVEMENTS <br />PRELIMINARY DESIGN <br />increases to 100% outside air only if the building is occupied (interlock with lights), or high <br />gas levels (gas detector) are present. This system, which modulates outside air, <br />generally uses significantly less energy than the 100% outside air system described <br />above. The modulating outside air system complies with NFPA 820 "Standard for Fire <br />Protection in Wastewater Facilities." Bradley Road does not currently have mechanical <br />cooling, however, this will be evaluated further as part of this Scope of Services. <br />The following HVAC improvement concepts for Lebern and Dover will be evaluated as <br />part of the Preliminary Design Phase: <br />1. Installation of an interior unit, similar to the Bradley Road design, which would <br />involve the demolition of the existing unit and abandonment of the underground <br />duct system. An evaluation of associated impacts to the site will be included with <br />this alternative. <br />2. An exterior unit with configuration and controls similar to Bradley Road, located <br />where the existing units are, and reutilize the existing underground ducts. <br />3. Retain the majority of the custom modular exterior unit, and replace or modify the <br />back section/module currently providing 100% outside air, with a mixing section <br />(outside air, return air). The adjacent exhaust fan would be removed, and existing <br />exhaust duct would be extended as return air to the unit. <br />All of these options will achieve the overall project goal to provide an HVAC system that <br />will utilize a mixed air design of outside and recirculated air. <br />These evaluations will also include a determination of impacts for the inclusion of <br />mechanical cooling as part of these improvements. It is anticipated that mechanical <br />cooling will be provided via a separate, ductless, refrigerant split system (interior <br />evaporator, exterior condensing unit), or incorporated (modular) with the <br />heating/ventilating unit. <br />Prepared by CT Consultants, Inc. I September 21, 2018 <br />