711 112TH ST SE 7 ELEVEN Geotech Report 2018-01-02 MF Import

( Subsurface Explorarion anC Proposed 7•Eleven Property Geotechnical Engincering Reporr Evererr, Waxhington Deslgn Recammrndationr 9.5 Passive Resistance Resistance to lateral loads on the structure may be provided by passive soil resistance against the grade beam. Passi��c resistance may be modeled as an equivalent fluid pressure equal to 200 pounds per cubic foot (pc�. This is an allowable value that includes a factor oF safety of at least 3. 9.6 Pile/Pier inspections The actual total length of each pile/pier may be adjusted in the field based on required capacity and conditions encountered during drilling. Since completion of the pile/pier takes place below ground, the judgmen[ and experience of the geotechnical engineer or his field representative must be uscd as a basis for determining the required penetration and acceptability of each pile/pier. Consequendy, use of the presenred pile/pier capacities in the design requires that all piles/piers be inspected by a qualified geotechnical engineer or engineeting geolugist from our firm who can interpret and collect the installation data anG examine the contractors operations. AESI, acting as the owner's fi^Id representative, would determine the required lengths of tt�e piles/piers and keep records of pertinent installation data. A final summary report would then be distributed, following cumpletion of pile/pier installation. 10.0 DRAINAGE CONSIDERAT[ONS It is recommended that the buildings be provided widi a perimeter footing or grade beam drain system. Footing/grade beam drains, with clean outs, should consisc of at least 4-inch-diameter, perforated, rigid PVC pipe. If the rock trenches are not contaminated with fines, are free draining, and are hydraulically connected to each other, drainage may be provided by stubbing an outlet pipe into a low collection point within the rock. If the trenches are not free draining or if CDF is uscd for backfill, conventional perimeter footing drains should be used. In this case, the PVC pipe should be fully envclopeJ in pea gravel or washed rock and be placed approximately 2 inches below tlie f�oling subgrade elevation. All drainage systems should be sluped to drain by gravity to a storm water conveyance system or other suitable discharge location. Water from downspouts and surface runoff should be collected independendy and routed ro an appropriate storm warer wmeyance sysrem. This water must not be allowed to enrer thc footing drain system. Alnrch 19, 200! ASSOClATED EARTH SGENCES sei�.�n ne�rzv,e�� . n n�r �+o� -«:n Page l2 � �ti/w