615 75TH ST SE Geotech Report 2022-10-25

Subsurface Exploration, Geologic Hazard, and Boardwalk Condominium, Building C Geotechnical Engineering Report Everett, Washington Design Recommendations 12.0 DRAINAGE CONSIDERATIONS As noted previously, we observed the black, corrugated PVC pipe at the ground surface on the slope adjacent to the condominium near AESI's exploration boring E13-1. We recommend that some checks on the roof downspouts, any foundation drainage, and any other related drainage be performed. Examination of roof downspouts, footing drainage, and other existing subsurface drainage was beyond AESI's current scope of work. Existing perimeter footing drains must not be allowed to discharge onto steep slopes. Roof and surface runoff should not discharge into the footing drain system, but should be handled by a separate, rigid, tightline drain that discharges away from steep slopes. Runoff water from impervious surfaces should be collected by a storm drain system that discharges into the site storm water system. 13.0 PROJECT DESIGN AND CONSTRUCTION MONITORING We are available to provide additional geotechnical exploration and consultation as the project design develops and possibly changes from that upon which this report is based. We recommend that AESI perform a geotechnical review of the plans prior to final design completion. In this way, our earthwork and foundation recommendations may be properly interpreted and implemented in the design. This review is not included in our current scope of work and budget. We are also available to provide geotechnical engineering and monitoring services during construction. The integrity of the small-diameter pipe piles depends on proper site preparation and construction procedures. In addition, engineering decisions may have to be made in the field in the event that variations in subsurface conditions become apparent. September 12, 2012 ASSOCIATED EARTH SCIENCES, INC. FSM11d-EE120288A8-Projects1201202881EEMP Page 11