4841 GLENWOOD AVE 2021-06-09 - Laserfiche WebLink

Retaining Wall Recommendations Page 4 August 21,2019 Everett,Washington RGI Project No.2016-072 Table 2 Structural Fill Compaction ASTM D1557 Minimum Moisture Content Location Material Type Compaction Percentage . Range Wall Foundation On-site granular or approved 95 +2 -2 imported fill soils: Retaining Wall Backfill On-site granular or approved 92 +2 -2 imported fill soils: General Fill (slope areas) On-site soils or approved pimported fill soils: 90 +3 -2 Placement and compaction of structural fill should be observed by RGI.A representative number of in-place density tests should be performed as the fill is being placed to confirm that the recommended level of compaction is achieved. Fill Slope Above Wall The permanent fill slope above the wall should be graded with a finished inclination no greater than 3H:1V. Upon completion of construction,the slope face should be trackwalked, compacted and vegetated, or provided with other physical means to guard against erosion.All fill placed for slope construction should meet the structural fill requirements as described above. Final grades at the top of the slopes must promote surface drainage away from the slope crest. Water must not be allowed to flow in an uncontrolled fashion over the slope face. The curb proposed on the edge of the parking and drive area should provide adequate surface water control into the existing storm drainage system. Additional Services RGI is available to provide geotechnical engineering and construction monitoring services during construction.The integrity of the earthwork and construction depends on proper site preparation and procedures. In addition, engineering decisions may arise in the field in the event that variations in subsurface conditions become apparent. Limitations This letter is the property of RGI, Ms. Isha Daramy, and her designated agents. Within the limits of the scope and budget, this letter was prepared in accordance with generally accepted geotechnical engineering practices in the area at the time this letter was issued. This letter is intended for specific application to the retaining wall at 4841 in Everett,Washington, and for the exclusive use of Ms. Isha Daramy and her authorized representatives. No other warranty, expressed or implied, is made.Site safety, excavation support,and dewatering requirements are the responsibility of others. The analyses and recommendations presented in this letter are based upon data obtained from the explorations performed on site and our observations during the previous work on the wall. Variations in soil conditions can occur, the nature and extent of which may not become evident until construction. If variations appear evident, RGI should be requested to reevaluate the recommendations in this letter prior to proceeding with construction. I al RILEYGROUP