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EARTH STRATA GEOTECHNICAL SERVICES 8 March 30, 2023 Project Number 234812-10A locations should extend to 10 feet below existing grade. 5XT Geogrid or equivalent should be placed at the bottom the excavation and the compacted fill should be reinforced with 5-XT Geogrid every two (2) vertical feet of compacted fill up to 4 feet below finish grade. Wet Removals Wet alluvial materials will probably not be encountered within the low lying areas of the site. If removals of wet alluvial materials are required, special grading equipment and procedures can greatly reduce overall costs. Careful planning by an experienced grading contractor can reduce the need for special equipment, such as swamp cats, draglines, excavators, pumps, and top loading earthmovers. Possible solutions may include the placement of imported angular rock and/or geotextile ground reinforcement. More specific recommendations can be provided based on the actual conditions encountered. Drying or mixing of wet materials with dry materials will be needed to bring the wet materials to near optimum moisture prior to placing wet materials into compacted fills. Oversize Rock Oversize rock is not expected to be encountered during grading. Oversize rock that is encountered (i.e., rock exceeding a maximum dimension of 12 inches) should be disposed of offsite or stockpiled onsite and crushed for future use. The disposal of oversize rock is discussed in greater detail in General Earthwork and Grading Specifications within the last appendix of this report. Compacted Fill Placement Compacted fill materials should be placed in 6 to 8 inch maximum (uncompacted) lifts, watered or air dried as necessary to achieve uniform near optimum moisture content and then compacted to a minimum of 90 percent of the maximum dry density determined by ASTM D 1557. Import Earth Materials Should import earth materials be needed to achieve final design grades, all potential import materials should be free of deleterious/oversize materials, non-expansive, and approved by the project geotechnical consultant prior to delivery onsite. Slot Cuts and Temporary Shoring Vertical excavations exposing removing support from adjacent structures or utilities will require the use of temporary shoring or slot cutting (ABC method). Temporary shoring should be designed for an equivalent fluid pressure of 40 pounds per cubic foot per the enclosed calculations. The slot cutting method uses the earth as a buttress and allows the excavation to proceed in phases. The initial excavation is made at a slope of 1:1. Alternate slots of 10 feet in width may be worked. The remaining earth buttresses should be 10 feet in width. The “A” slot cuts should be completed and backfilled before the "B" earth buttresses are excavated. The "C" earth buttresses may be excavated upon completion of the backfilling of the "B" areas. 2130 E 4th St 2/11/2025