8204 BEVERLY LN 2025-03-24 - Laserfiche WebLink

City of Everett Property Access Work Plan DETAILED WORK DESCRIPTION This plan applies to one(1)boring location planned within the City of Everett ROW as shown in Appendix A and listed in Table 1 below. Table 1. List of Borings Within City of Everett ROW/Parcels Boring ID Nearest Address S32A 8204 Beverly Lane Activities at the approved boring location will include, but are not limited to the following: 1)Site reconnaissance with property owner or designated contact(if required)and mark exploration locations. 2) Utility locating, move locations as needed and potholing. 3) Perform geotechnical boring. 4)Survey of final boring location. The boring is planned at these locations to characterize the subsurface conditions along the future Sound Transit Everett Link Extension (EVLE)alignment. The field investigation activities will not directly impact any of the adjacent private properties(unless authorized by the private property owner), however traffic control may impact access to adjacent properties while explorations are being conducted. There will be multiple mobilizations to the site. Each of the major activities are described below in greater detail. Utility Locate (One Call) Prior to drilling,the boring locations will be marked, and the One Call service will be notified for utility locates. The boring locations will be recorded with a GPS unit. Representatives of each utility will then visit the site to mark underground utilities. This work will typically take place a week to 10 days before the drilling activities commence. Pavement Coring To minimize the extent of damage to the road pavement and prepare for the drilling activities,the concrete or asphalt pavement will be drilled through using a diamond-tipped pavement core barrel, 6 to 12 inches in diameter. After the core barrel drills through the pavement, the pavement core will be removed to evaluate the pavement layer thicknesses and subgrade soil conditions. Cuttings associated with the pavement coring will be vacuumed from the roadway during drilling or potholing. Vacuum Excavation (potholing) Utility potholing may be performed at select boring locations using vacuum excavation or airknife to excavate to a depth of 6 to 8 feet to check for unmarked or mismarked underground utilities at the proposed boring locations.The vacuum equipment utilizes a high- velocity air stream to penetrate, expand and break-up soil.The loosened chunks of soil and rock are then removed from the hole through the use of a powerful vacuum. In this way a hole is aw created that reveals the buried utility. These excavations are e` typically around 12 inches in diameter at the ground surface, and will be backfilled and patched upon completion of the drilling activities. The potholing operation is typically performed utilizing a truck that is roughly 10' by 30' long, or by using a trailer mounted unit.Typical duration for utility potholing is 2-3 hours and may immediately precede the geotechnical drilling. Geotechnical Drilling The borings will be drilled using truck-or track-mounted drill rigs and are planned to be 100 to 150 feet deep (refer to Summary Table).The final selected drilling locations will be accessed from public ROW. Each boring will be approximately 6 to 8 inches in diameter and will be advanced into the ground using either mud fi rotary or sonic drilling technique. For mud rotary drilling,the borehole is advanced through the soil using a rotary drill bit j mounted at the end of drill rods. Drilling fluid is pumped down through the hollow rod string and rotary drill bit,where it entrains drill cuttings and carries them to the surface as the drill mud flows upward to the surface. The drilling fluid and soil cuttings 4 flow into a tub where coarse drill cuttings are screened off for \ containment and disposal. Drill fluid is recirculated from a mud tub.