120 SE EVERETT MALL WAY Geotech Report 2018-01-02 MF Import

Crow-Western August 14, 1985 Site Preparation and General Earthwork E-2708 Page 8 The building and pavement areas should be stripped and cleared of all trees, surface vegetation, all organic matter and any other deleterious material. It is anticipated that a stripping depth of twelve (12) to eighteen (18) inches will be required. Stripped materials should be removed from the site or stockpiled for later use in landscaping, if desired. The stripped materials should not be mixed with any materials to be used as structural fill. Structural fill is defined as any Lill placed under buildings, roadways, slabs, pavements, or any other load bearing areas. Following the stripping operation, the ground surface where structural fill, foundations, or slabs are to be placed should be prooErolled. All proofrolling should be performed under the observation oE a representative of Earth Consultants, Inc. Soil in any loose or soft areas should be removed and replaced with structural Eill to a depth that will provide a stable base beneath the general structural fill. Structural fill under floor slabs and footings should be placed in horizontal lifts and compacted to a minimum 95 percent of the maximum dry density in accordance with ASTM Test Designa- tion D-1557-70 (Modified Proctor). The fill materials should be placed at or near the optimum moisture content. Fill under pavements and waJ.ks should also be placed in horizontal liEts and compacted to 90 percent of maximum density except Eor tha top twelve (12) inches which should he compacted to 95 percent of maximum density. The moisture content of the on-site soils at the time of our exploration was variable with wetter soils being found on the northeri: portion of the site. Some soils have moisture contents above optimum. All soils encountered were moisture sensitive and will be difficult to work when moisture contents are above optimum. Usa of on-site soils for fills will be successful if work is conducted in dry weather and the contractor is selective regarding the soils used. Ideally, structural fill to be placed in wet weather should consist oE a granular material with a maximum size of tfiree inches and no more than 5 percant fines passing the No. 200 sieve. Duriny dry weather, any compactible non-organic soil can be used as structural fill. FIELD EXPLORATION AND LABORATORY TESTING Our field exploration was perEormed on August 1, 1985. The subsurface conditions were explored by excavating thirteen test pits to a maximum depth of ten feet below the existing surface at the approximate locations shown on Plate 2. Earth Consultants, Inc.