Laserfiche WebLink
February 28, 2023 G-5835 <br /> 3821 —Shore Ave Everett,WA Page 7 <br /> settlement or collection points for treatment and discharge, as appropriate for the site conditions, <br /> per a construction stormwater management plan. <br /> Grading and Slopes <br /> We recommend that temporary excavation slopes conform to the limits specified in local, state <br /> and federal government safety regulations,unless evaluated and approved otherwise by the <br /> geotechnical engineer. <br /> Unsupported temporary excavation slopes greater than four feet in height should be sloped no <br /> steeper than l H:IV(Horizontal: Vertical), unless specifically evaluated and approved by the <br /> geotechnical engineer. Alternatively, shoring could be used if adequate room for sloped <br /> excavations is not available. <br /> We recommend that permanent unreinforced slopes be inclined no steeper than 2.5H:1 V. To <br /> mitigate post-construction soil erosion,exposed soils and permanent slopes should be re- <br /> vegetated with non-invasive plant species. <br /> If groundwater seepage or other, unanticipated, adverse soil conditions are encountered during <br /> site excavation, the geotechnical engineer should be contacted to evaluate the encountered <br /> condition and provide updated recommendations regarding excavation procedures and cut slope <br /> configurations, if appropriate. <br /> Structural and Non-Structural Fill <br /> Recommendations for suitable structural fill properties are provided below: Fill material placed <br /> beneath the retaining wall should be considered structural fill. Fill material that is not anticipated <br /> to support structures, such as the retaining wall backfill, should be considered non-structural fill. <br /> Material used as fill should have the following characteristics: <br /> - Be predominantly granular material; <br /> - Be free of organic material and other deleterious substances; <br /> - And have a maximum particle size of three (3) inches in diameter. <br /> The material should be placed at or near its optimum moisture content. The optimum moisture <br /> content is the water content in the material that enables it to be compacted to the maximum dry <br /> density for a given compaction effort. Materials which contain moisture significantly greater or <br /> tilt <br /> E <br />[ GEO Group North-west, Inc. <br />