500 LAUREL DR 2016-01-01 MF Import

Geotechnical Engineering Study 00-2267 Three Story Addition - 500 Laurel Street, Everett January 31, 2001 .f. Page 18 " minimize the exposure of the soils to wet weather. All excavation and/or removal of materials should be rapidly followed by the placement and compaction of new non-sensitive backfill materials. It might also prove helpful if the excavation work for the proposed addition can be carried out with a trackhoe. An adequately sized trackhoe can be set in one location to excavate materials and to place them into trucks without moving from its original location. This helps to ►ninimize the amount of equipment traffic across the site as well as limiting the truck traffic activity. We also recommend that in wet weather construction all prepared foundation or floor slab subgrades be protected against the elements. This may be readily accomplished by placing a thin layer of pea gravel, crushed rock or recycled concrete, crushed railroad ballast, or eNen a cement and sand "mud maY' over the exposed surface. This protective layer need only be about one to two inches thick since it is primarily to prevent subgrade disturbance by the workmens' foot traffic. Excavatsons ar�d Siopes As indicated earlier, site development appears unlikely to involve any excavation of more than four feet in depth. Nevertheless, we recommend both th,e owner and the earthwork contractor should be aware that in no case should slope heights or excavation depths, including utility trenches, exceed those specified in local, State and Federal Govemmentsafety regulations, particularly the OSHA Health and Safety Standards for Excavations, 29 CFR Part 1926, dated October 31, 1989. We understand that these regulztions are being strictly enforced and, if they are not closely followed, both the owner and the earthwork contractor could be liable for substantial fines. We also recommend that the owner's and contractors attention be directed to the following local and state regulations. WSDOT Section 2- 09.3(3)B, and Washington Industrial Safety and Health Act, Chapter 49.17 RCW. Based on the otrserved soil conditions over the proposed building areas of the site, and in consideration of the subsurface data generated by ourstudy, we believe that the shallow silty sand soils shouid be classifiEd as Type "B" soils in general accordance with current OSHA regulations. Thus, excavations extending down to depths of greater than four feet into the shallow silty sand and sandy silt soils zq