3214 BROADWAY BROADWAY KINECT APARTMENTS 2021-08-11

• American Property Development ES-0599.06 January 22, 2015 Page 6 • Updated June 9, 2016 • • Structural Fill • • We anticipate structural fill placement will generally be required behind foundation walls and • within utility trench excavations. Structural fill may also be necessary in slab-on-grade areas. • Where structural fill is necessary below the proposed building foundations, a suitable crushed rock material should be used. In our opinion, clean crushed rock consisting of one and one half • inch to two inch aggregate should be used below foundations where fill placement is necessary. • Where structural fill is utilized outside of the foundation areas, a suitable granular soil with a • moisture content that is at or near the optimum level should be used. The native silty sand soils • can be considered for use as structural fill provided the soil is at or near the optimum level at • the time of placement. The native soils have a moderate sensitivity to moisture, and will • become unstable if exposed to excessive moisture. If the native soils cannot be successfully compacted, the use of an imported soil may be necessary. Imported soil intended for use as • structural fill should consist of a well graded granular soil with a moisture content that is at or • near the optimum level. During wet weather conditions, imported soil intended for use as • structural fill should consist of a well graded granular soil with a fines content of five percent or • less defined as the percent passing the #200 sieve, based on the minus three-quarter inch fraction. • • Structural fill is defined as compacted soil placed as wall backfill and in slab-on-grade, utility • trench, and roadway areas. Soils placed in structural areas should be compacted to a relative compaction of 90 percent, based on the maximum dry density as determined by the Modified • Proctor Method (ASTM D-1557-02) and placed in maximum twelve inch lifts. In pavement • areas, the upper twelve inches of the structural fill should be compacted to a relative • compaction of at least 95 percent. As previously mentioned, structural fill below foundations • should consist of a suitable crushed rock material. • Erosion Control • In general, control of off-site erosion for this project will likely be limited to construction • entrances. Silt fencing should be installed as appropriate, and as needed along the site • perimeter. Construction entrances should consist of quarry spalls underlain by a non-woven • filter fabric. Quarry spall thickness will depend on subgrade stability at the entrance, but should • typically be at least six inches. • Shoring Recommendations • • We anticipate cuts of up to approximately 15 feet will be required to construct the below grade • garage levels. Where sufficient space is available, a portion of the garage level excavations • may be completed using open cuts. Temporary shoring or a combination of shoring and temporary slopes will be necessary where the building will be sited in close proximity to the • property limits. • • • Earth Solutions NW,LLC • • •