3606 W MUKILTEO BLVD 2016-01-01 MF Import

Gcotechnical Engincering Evaluation Mukiltco Boulcvard Devclopmcnt Gvcrctt, Washington March 31, 2003 NGA Pilc No. 366503 Pagc 9 slruch�res or property lines, shoring systems may be utilized to protect the planned r•' -. If loose soils or ground water seepage are encountered, tlatter inclinations may be necessary. Wc ,:ommend thnt cut slopcs be protected t}om crosion. Mcasures taken may include covering cut slopes with plastic sheeting and divcrting surfacc runoff away Gom thc top of cut slopc s. We do not recommend vertical slopes for cuts dceper than 4 fect if workcr acccss is neccssary. We recommcnd that cut slope heights and inclinntions confonn to WISIIA/OSFIA standards. Final slopc inclinations for structural fill and the native soils should be no stecper thnn 2H:1 V. Lightly compacted fills or common fills should be no stecper than 3H:1V. Common fills arc defincd as fill material with or without some organics that arc "trackrolled" into place. Thcy would not meet thc compaction spccification of strucwral fill. Pinal slopes should be planted with vegetation and covcred with straw or jute netting. Tlie vegctation should be maintained until it is established. Structural Fill Gencral: Pill placed bencatl� thc foundations, pavcmcnt, sidewalks, or othcr sctdcmcnt-scnsitive stn�ctures shoidd bc placcd as structural fill. Structural fill, by dcfinition, is placcd in accordancc with prcscribcd mcthods and stnndards and is monitorcd by an esperienced geotechnical professional or soils technician. �icld monitoring proccdures ��ould includc the perfonnance of a reprcsentative number of in- place deusity tests to document thc attainment of thc desired degree of relative compaction. Tlic area to receice the fill should be preparcd as oudined in the Site Preparation anJ Grading subsection of this rcport. Mnteriuls: lmportcd structural fill should consist of a good quality, granular soil, frcc of organics and othcr dcleterious matcrial and be wcll-gradcd ro a ma�imum sizc of about 3 inchcs. Imported, all-wcather fill should contain no more than about fiec percent fincs (soil finer than U.S. No. 200 sieve, based on that f�action passing thc U.S. 3/4-inch sicvc). Thc use of on-site soils as stn�ctural fill will bc dependent on moislure content control. Some drying of tlie soils may be necessary in ordcr ro achicve compaction. During wami, sunm� days this could be accomplished by spreading the material in thin lilis over a large arca. Some neration and/or addition of NELSON GEOTECHNICAL ASSOCIATES, INC.