CHS Engineers LLC 5/4/2020 - Laserfiche WebLink

3.4.Public Information: prepare simple plan view technical exhibits depicting proposed station element location for up to three alternative sites, for use in City's public information programs. 3.5.Evaluation Report: prepare report to document and summarize findings of research, field observations, mapping, capacity estimate, alternatives configuration and alternatives analysis, and present recommendations for preferred station site and configuration, and additional analysis as appropriate. Summarize recommendations for procurement of power, control and SCADA integration work. 4. Management Reserve 4.1.Tasks not included in Items 1, 2 or 3 of the Scope of Work but that may be authorized by the City on a time and expense basis to support completion of the Siting Evaluation and Pre-Design phase of the work. Deliverables: • Planning Maps: draft and final preliminary site and force main planning maps, as basis for the siting evaluation • Evaluation Report— draft and final report. Notes, Clarifications and Assumptions: • City has provided GIS data documenting existing City-owned facilities including water, sewer and stormwater piping in the project area. • City has provided as-constructed plans for the original station construction. • City has provided two geotechnical reports for the project area: Shore Ave. Slope Stability Study(1983)and Shore Ave. Stormwater Outfall Improvements Project(2015). • City has provided plan and profile sheets depicting existing sanitary sewer along Shore Ave. and AutoCAD file for 2016 stormwater project along east end of Shore Ave. • City will provide access into station control room and to Bioxide® control system. • The station service area is not a combined sewer system. The City has flow data or prior evaluation that identifies peak hour infiltration and inflow rates or has developed criteria to be used for sizing replacement wastewater facilities. • Factory sound-attenuation enclosures for standby power generators are beneficial for noise reduction but may not be sufficient to meet local or state noise ordinance restrictions for non-emergency daytime operation (i.e. exercising operations). City will determine if a factory sound-attenuation enclosure is satisfactory or if an extraordinary drop-over sound attenuation enclosure is warranted in the project area. • Recommended action, if any, for modification of the existing station piping and/or station will be developed once more is known about the bridge replacement project and in context of the recommended work for Lift Station #15. • Geotechnical or structural evaluation, if found to be recommended or necessary to support recommended work at the existing station, will be addressed in a future phase of engineering services. • From online research, it appears that only single-phase power is available on Shore Ave.; therefore, three-phase power would have to be extended from W. Mukilteo Blvd. for sites B and C and any other sites along Shore Ave. CHS Engineers, LLC Page 4 of 5