10105 19TH AVE SE Geotech Report 2018-01-02 MF Import

�- . ( • Geotechnical Engineering Evaluation Everett Veterinary Clinic Febn;ary 21,2002 � NGA File No. 342902 Page 8 (` vertical slopes for cuts deeper than 4 feet if worker access is necessary. We recommend that cut slope � heights and inclinations confortn to WISHA/OSHA standards. � Structural Fill I Generol:Fill placed beneath the foundations,pavement,or other settlement-sensitive suuctures should be placed as structural fill. We do not anticipate significant amounts of structural fill on this project. Structural fill, by definition, is placed in accordance with prescribed methods and standards and is Ij monitorcd by an experienced geotechnical professinnal or soils technician. Field moniroring procedures would include the performance of a representative number of in-place density tests to document the Inttaimnent of the desired degree of relative compaction. The area to receive the fill should be prcpared as outlined in the Site Preparetion and Greding subsection of this report. 1_ Materials: Imported structural fill should consist of a good quality, free-draining, granular soil, fres of Iorganics and other deleterious material and be well-graded to u maximum size of about 3 inches. Imported, all-weather fill should contain no more than about five percent fines (soil finer than U.S. No. 200 sieve, based on that fraction passing the U.S. 3/4-inch sieve). '_ The use of on-site soils as strucniral fill will be dependent on moisture content control. Some drying of Ithe soils may be necessary in order to achieve compaction. During warm, sunny days this could be accomplished by spreading the �!iaterial in thin lifts over a large area. Some aeration and/or addition of Imoisture may also be necessary. We expect that compnction of the native soils to structural fill specificutions would be difficult, if not impossible,during wet weather. IFIII Placement: Following subgrade preparation, placement of the structural fill may proceed. All backfilling should be accomplished in uniform lifts up to 12 inches thick. Each lift should be spread evenly and be thoroughly compacted prior to plucement of subsequent lifts. All structurul fill underlying building areas,and within 2 feet of pavement subgrade,should be compacted to a minimum of 95 percent of its maximum dry density. Maximum dry density, in �his report, refers to that density as determined by the ASTM D-1557 Compaction Test procedure. Fills more than 2 fee: �eneath sidewalks and pavement subgrades should be compncted to 90 percent of their maximum dry density. The moisture content of the soils to be compacted should be within about 2 percent of optimum so that a readily-compactable I NELSON GEOTECHN/CAL ASSOCIATES, INC. O