7818 LARIMER RD B Geotech Report 2022-10-25

Once the grading plans and construction sequencing are finalized, we should be contacted to evaluate the need for shoring or underpinning. If shoring is deemed necessary, we should be contacted to provide detailed shoring plans to assure on -site stability during construction. Note that is the responsibility of the contractor and/or owner to assure site stability during and after construction. Wet Weather: In our opinion, the site is not suitable for wet weather construction. Earthwork done during summer months will be most likely more economical. In any case, during construction in wet or cold weather, grade the site such that surface water can drain readily away from the building areas. Promptly pump out or otherwise remove any water that may accumulate in excavations or on subgrade surfaces, and allow these areas to dry before resuming construction. Berms, ditches and similar means may be used to prevent storm water from entering the work area and to convey any water off -site efficiently. Wet weather construction will require the implementation of best management erosion and sedimentation control practices to reduce the chances of off -site sediment transport, including but not limited to covering the excavated slopes with plastic sheets, using silt fences, bales of straws, and prompt subgrade preparation and concrete pour. All excavations during wet weather should be covered with plastic sheeting and adequate drainage should be provided to avoid cut/excavation instability due to soil saturation. It is important to understand that, if proper precautions are not taken, sudden cut or excavation failures can occur without warning during wet weather, which can be fatal. Cold Weather: If earthwork is performed during the cold winter months when freezing might become a factor, no grading fill, structural fill or other fill should be placed on frosted or frozen ground, nor should frozen material be placed as fill. Frozen ground should be allowed to thaw or be completely removed prior to placement of fill. A good practice is to cover the compacted fill with a "blanket' of loose fill to help prevent the compacted fill from freezing overnight. The "blanket" of loose fill should be removed the next morning prior to resuming fill placement. During cold weather, foundations, concrete slabs -on -grade, or other concrete elements should not be constructed on frozen soil. Frozen soil should be completely removed from beneath the concrete elements, or thawed, scarified and re -compacted. The amount of time passing between excavation or subgrade preparation and placing concrete should be minimized during freezing conditions to prevent the prepared soils from freezing. Blankets, soil cover or heating as required may be utilized to prevent the subgrade from freezing. Proposed Construction Project No: 0470-WA18 January 24, 2019 Page No: 14 of 17