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August 29, 2019 <br />Mr. Jeff Davis <br />G-4971 <br />Page 5 <br />Structural fill material should be spread and compacted in Iifts that are 10 inches or less in <br />thickness in an un-compacted state. The compacted fill material should be field tested by using <br />ASTM Designations D2922 and D3017, Nuclear Probe Method, to verify that the required <br />degree of compaction has been achieved. <br />Foundations <br />Soils that are anticipated to be acceptable for building support were encountered at depths of <br />approximately 1.5 feet below ground surface on the east side of the residence. This depth may <br />extend below existing footing depths of the residence. Excavation work for the project should <br />not extend below a 1 H:1 V line extending from the bottom of the existing footings, in order to <br />avoid affecting the support of the existing footings. <br />Conventional Footing Foundations <br />Conventional strip and column footings should bear directly on undisturbed, medium dense to <br />dense native soils or on compacted structural fill that has been placed on a medium dense or <br />dense native soil subgrade. Our recommended design criteria for conventional footing <br />foundations constructed on native soils or structural fill are provided below. <br />- Allowable bearing pressure, including all dead and live loads: <br />Undisturbed, dense native soil = 2,000 psf <br />Structural fill placed on dense native soil = 2,000 psf <br />- Minimum depth to base of perimeter footing below adjacent exterior grade =1 S inches <br />- Minimum depth to bottom of interior footings below top of floor slab = 12 inches <br />- Minimum width of wall footings = 16 inches <br />- Minimum lateral dimension of column footings = 24 inches <br />- Estimated post -construction settlement = Yz inch <br />- Estimated post -construction differential settlement across building width - Y2 inch <br />GEO Group Northwest, Inc. <br />