Murray, Smith, and Associates, Inc. 2/1/2017

alternative slope stabilization measures considering the results of slope stability analyses and proximity of the new reservoir, if applicable. • Provide recommendations for site preparation and earthwork including estimated stripping depths and required subgrade preparation, suitability of on-site soils for use as structural fill including any constraints for wet weather construction, gradation criteria for any structural fill material which may have to be imported, and fill placement and compaction requirements. Also provide earthwork and construction considerations for demolition of the existing Reservoir 2 considering the adjacent slope. • Develop recommendations for excavation and shoring, including temporary cut slopes. • Provide a description of the groundwater conditions encountered or expected and conclusions and recommendations regarding dewatering techniques, where appropriate. This will include a discussion of appropriate dewatering techniques and details, and suggestions for dewatering specifications and bid items, if appropriate. • Perform engineering analyses and provide conclusions and recommendations for the following: o Foundation type for the reservoir and appropriate design capacities and/or bearing pressures, lateral resistance values and estimates of expected foundation settlement. We anticipate that both a mat foundation and a slab and ring-wall foundation configuration will be evaluated. o Settlement mitigation measures, if applicable, including preload and surcharge alternatives to reduce post construction settlements to within tolerable limits. o Geotechnical considerations for subgrade preparation for foundations. o Shoring design including lateral pressures and partial shoring considerations. o Pipe support including bedding and backfill. o Construction dewatering considerations including depth to groundwater encountered during drilling, and estimated permeability coefficients based on laboratory sieve analyses. o Seismic design criteria based on AWWA and IBC including soil profile type, spectral response accelerations, seismic coefficients, site class and seismic use group. o Erosion control measures during and following construction, and permanent site drainage. o Shallow building foundations and slab-on-grade for the new valve house. o Retaining wall design parameters for grade transitions at the site, if required. • Comment on any anticipated construction difficulties identified from the results of the field exploration and from experience on projects at similar sites. • Present findings and recommendations in a written report with supporting site plan, boring logs, and other applicable figures. • Attend one or two meetings with MSA and/or the City of Everett, as requested. • Provide support to MSA during preliminary design of the plans and specifications, as requested. City of Everett MURRAY,SMITH&ASSOCIATES,INC. Replacement of Reservoir 2 January 12,2017 Engineers/Planners Prelim Design Page 11