616 PECKS DR 2018-01-01 MF Import

� � ~ ro b � ' ' C M N � H Everett School District W-6884 o � 0 15 June 1990 Page 3 'ti y N 'i � � � p ,��, The exploration logs enclosed with this letter indicate the various types of soils and c, • � y materials encountered in the borings, as well as the depths where the soils or the y� H characteristics of the soils changed. It should be noted that these changes may have ?S n m been gradual, and if they occurred between sample intervals, the depth of the change � � N was interpreted. The relative density or stiffness of the soils indicated in the logs are " b a s e d o n d r i l l i n g a c t i o n, a d v a n c e m e n t r a t e o f t h e d r i l l r i g, an d the drivin g resistance measured during sampling (N-values). Subsurtace Conditions In the grass covered play area southeast of the existing school, our subsurface explorations revealed one to two feet of loose, rusty brown, silty sands with scattered roots overlying ven,� dense silty sands (Weathered Till and Glacial Till). Boring B-1 in the asphalt paved courtyard disclosed roughly 5 feet of loose to dense sands with wood / �, fragments (uncontrolled fill) overlying the glacial till soils. Groundwater was encountered I �� at a depth of approximately 8 feet below the ground surface in boring B-2 at the time of drilling. It should be noted, however, that the groundwater conditions observed during 1 '..� our exploration program may vary significantly due to changes in season, precipitation �� pattems, site utilization, and other factors. , �� CONCLUSIONS AND RECOMMENDATIONS � �� Development plans cail for the construction of two building additions as previously discussed in the Site and Project Description section. The subsurface conditions are, in �.�� 1 our opinion, generally favorable from a geotechnical standpoint for the use of conventional spread footings, continuous wall footings, and slab-on-grade fioors. � Detailed recommendations for site preparation and fill piacement and for the design of �� footings, slabs-on-grade, backfilled walls, and drainage systems are presented below. I , Because the near-surface soils are silty and therefore highly susceptibie to disturbance I � � when wet, special attention to wet-weather construction would be required. �.�,�1 � ---- -. \ Site Preparation We recommend that initial site preparation include ciearing and stripping of the construction areas. All building, pavement, and sidewalk areas and areas to receive structural fill should be stripped of all vegetation, topsoil, root-laden soils, uncontrolied fiil soils, and other deleterious materials. Based on our borings, we would anticipate up to