Aspect Consulting LLC 8/3/2020 - Laserfiche WebLink

Grand Avenue Utilities Replacement,UP No. 3711 June 30,2020 Project No. 170095 Task 1-Site and Project Review We will review our files for relevant and available geologic maps of the Site area, existing construction data, and our 2017 draft report. Task 2-Exploration Planning and Permitting We will visit the Site, meet with City staff and the utilities' representatives to discuss the proposed exploration locations, and adjust conflicts based on utility mark-outs. We will then submit an Exploration Program Plan providing details pertaining to: • Field work and deliverables schedules • Aerial image showing the boring locations and sections of street parking areas that will need to be restricted during explorations • Completed City of Everett PW Site Work/Right-of-Way Permit Applications • Drilling equipment and method(with equipment photos) • Site restoration and borehole completion details • Utility notification tickets • Traffic control plans in accordance with City of Everett Design& Construction Standards Section 700: Traffic Control, for two-lane roadway • Safety plan and emergency response • Contact information for Aspect's key personnel and subcontractors We anticipate portions of street parking will need to be restricted during drilling to reduce impacts to traffic and specifically between Everett Avenue and Hewitt Avenue. The City will be notified in advance with the time and dates and no explorations will be performed less than 48 hours prior to the no parking signage being posted. Aspect will rent traffic delineators and print and laminate the permits and attach these to the delineators. The delineators and permits will be posted at each boring location 72 hours in advance per the permit requirements. Task 3-Exploration Program and Soil Testing A local geotechnical driller will be subcontracted to advance four borings during one exploration day. Each boring will be drilled and sampled to a depth of 25 feet bgs, providing subsurface data to supplement the previous 10 borings. We understand that in some areas of Grand Avenue the sections may consist of asphalt concrete(AC) atop concrete pavement. Prior to drilling the borehole,the pavement will be cored and retained for later inspection. A truck-mounted drill rig will then be used to advance hollow stem auger, and standard penetration test(SPT) soil samples will be taken at 2'/2-foot intervals to a depth of 10 feet bgs and then at 5-foot intervals to up to 25 feet bgs. The borings will be backfilled with quick-curing ready-mix concrete and capped with black dye to approximately the existing asphalt pavement surface.Drill cuttings will be drummed and removed from the Site for proper disposal. The pavement section layer(AC, RCP if present, and aggregate base)thicknesses will be measured to the nearest '/2-inch,explorations will be logged, groundwater conditions noted, and representative soil samples collected by a member of Aspect's geotechnical staff Page 2