1004 BROADWAY EVCC STUDENT HOUSING - REPORTS & FINAL DOCUMENTS 2017-01-13

Geotechnical Report - �.�ised �' Proposed Apartments: 1002, 1006, and 1008 Broadway Street, Everett, Washington May 12, 2015 If the excavation cannot be accomplished using ecology block shoring, then consideration should be given to using a shoring system consisting of cantilevered soldier piles with timber lagging. S.S BASELINE SURVEY AND MONITORING Ground movements will occur as a result of excavation activities. As such, ground surface elevations of the adjacent properties and city streets should be documented prior to commencing earthwork to provide baseline data. As a minimurn, optical survey points should be established at the following locations: • The top of every other soldier pile. These monitoring points should be monitored twice a week. The monitoring fi•equency may be reduced based on the monitoring results. • Adjacent structures such as residences, garages, or retaining walls located within 25 feet of the planned shoring. The monitoring program should include monitoring for changes in both the horizontal (x and y directions) and vertical deformations. The monitoring should be performed by the contractor or the project surveyor, and the results should be promptly submitted to PanGEO for review. The results of the monitoring will allow the design team to confirm design parameters, and for the contractor to make adjustments if necessary. We also recominend that the existing conditions along the public right of way and the adjacent private properties be photo-documented prior to commencing earthwork at the site. 6.0 EARTHWORK CONSID�RATIONS G.1 MATERiAL REUSE The native soils underlying the site are moisture sensitive, and will become disturbed and soft when exposed to inclement weather conditions. We do not recommend reusing the native soils as structural fill. If it is planned to use the native soil in non-structural areas, the excavated soil should be stockpiled and protected with plastic sheeting to prevent it from becoming saturated by precipitation or runoff. 15-048 1008 Broadway, Revised Page 13 PanGEO, InC.