08-08-2007 Council Agenda - Laserfiche WebLink

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1. General Site Suitability Based upon interpreted results of the borings, it appears that the site has limitations regarding suitability for construction. The presence of Fill, Organic Sediments consisting of organic sediments, peat, silts, clays with low N- values and a high groundwater table. 2. Recommendation - I) Ordinary Cut and Fill AND /OR II) Screw Anchor System I) Ordinary Cut and Fill Method for Soil Correction A. Initial Site Preparation For an ordinary cut and fill approach to site correction, the proposed building pad areas, oversized as necessary, should be cleared of all uncontrolled fill, organic, loose, frozen or otherwise unsuitable soil, vegetation, debris and boulders (3 " +) prior to structure or fill placement. Dewatering of the site would be required for this correction procedure. Based upon soil boring results the following estimated minimum depths of excavation or dropping footings will be necessary due to the presence of organic sediments, peat, silts, clay with low N- values and a high groundwater table, encountered, See TABLE I. Table I Analysis of Soil Borings TABLE I Boring Number Elevation of ground at Boring Elevation at Buildable Soils, 2000 Ibs /sf max allowable soil bearing pressure Amount of Excavation (Feet) Elevation Bottom of Footings* Amount of Engineered Fill to bottom of Footings Elevation = 95.0 (Feet) Amount of Engineered Fill to bottom of Floor Slab ** Elevation =99.50 (Feet) 1 Building Pad 100.17 87.7± 12.5± 95.0 7.3± 11.8± 2 Building Pad 99.84 82.3± 17.5± 95.0 12.7± 17.2± 3 Salt Storage Building Pad 99.50 74.5± 25± 95.0 20.5± 25t 4 Building Pad 101.00 91.0± 10t 95.0 4.0t 8.5± 5 Parking 99.59 74.6± 25t NA NA NA 6 Parking 98.75 81.3± 17.5± NA NA NA Depth to Groundwater; app oximately 7.5 ± feet below existing grade. Assumes footings 5 feet below assumed floor slab elevation of 100.0 or footing elevation of 95.0. *Assumes 6 inch thick floor slab or bottom of floor slab elevation of 99.5. -10-