4326 CRESCENT AVE 2025-07-14 - Laserfiche WebLink

5.3 Excavations General, The inclination for a safe and startle excavation slope cut is determined based on two factors, the current Washington. State Safety and Health Administration (WSHA) regulations for confined spaccs and global stability of tile. slope cut. Most often, the WSHA regulations are more conservative;than.the global stability requirements. According to WAC 296-809-099, a confined space is defined as: "A space that is all of the following: (a)Large enough-and-arranged so an employee could fully enter the spaaC and work. (b)Has limited or ri strietod entry or exit. Examples of spaces with limited or restricted entry are tanks,vessels,silos,storage bins,hoppers,vaul:W,excavations,ind.pits. (c)Not primarily designed for hunian.occupancy." T1.1 llle volltext of sitc excavation and grading, the-Washington State Department of.Labor and Industries considers a confined space.as a space in whiclt a worker cn#ers an Cxcavation that is tall enough and/or narrow enough to inundate the worker and cause bodily harm if ii cave-in occurs. E This does not include excavations that are less than 4.0 feet in depth. FVSHA Approved Slope ON All excavations at the site associated with confined spaces, such. as utility trench a- and .lower j; level building and .retaining Nvalis, nitist be completed in accordance with local, state, and/or federal requirements, Based: on current Washington State: Safety and Health Administration I (WSHA)regulations,this existing hear-surface loose.to medium dense soils arc classified as Type C soils. Thp deeper unwe3athei-W Advance Outwash soils observed.beloiv 7.0 to S,0 feet would be classified as Typo B soils. s According to WSHA, for temporary excavations of less than 20 feet i.lt depth, the side slopes in Type G soils should be laid.back at.a slolte� inclination of 1.5:1- (Horizon#al:Vertieal} or fltltte.r from thee toe to the crest`of the.elope and the side slopes in Type B soils should be laid back,at a slop,+inclination of 1:i (kiorizontzl:Vertical):or flatter front the toe to the crest of the slope. All exposed slope; faces shoulO be covered with a durable reinforced clastic membrane during construction. to prevent slope raveling :and nutting during periods of prncilitatiott. These guidelines assume that all surface loads are lest at a tn.ininium distance.of at least one half the depth of the cut away from tile, top of the excavation slope and that significant seepage is not present on tite slope face. Matter cut slopes will be neccsstlxy where sigrlilicant raveling or seepage occurs,or if construction materials will be.:stockpiled along the slopc crest. if these Safi: temporary slope.inclinations cannot be achieved dui: to pt I erty line constr lints,shoring may be j necessary. This information is provided solely for the benefit of the o�vuer and other design coltsultalits, and should not.be construed to imply that Agcs"Eilgittecring,LLC assutttes responsibility roc lab site safety. 'It is understood that job site safety is the sole responsibility of the prgicet:contractor. - Pnge 8Ages 1-ii ineoring.f:t C 353-845-7tkirl is t