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Alliance Residence October 18,2016 <br />J.N.: 2530.00 <br />Page 16 <br />6.3.10 Foundation Observations <br />Foundation excavations should be observed by the project geotechnical consultant to verify that they <br />have been excavated into competent bearing soils and to the minimum embedment recommended <br />above. These observations should be performed prior to placement of forms or reinforcement. The <br />excavations should be trimmed neat, level and square. Loose, sloughed or moisture-softened <br />materials and debris should be removed prior to placing concrete. <br />6.4 RETAINING AND SCREENING WALLS <br />6.4.1 General <br />The following preliminary design and construction recommendations are provided for general <br />retaining and screen walls supported by engineered compacted fill or competent native soils. Final <br />wall designs specific to the site development should be provided for review once completed. The <br />structural engineer and architect should provide appropriate recommendations for sealing at all joints <br />and applying moisture-proofing material on the back of the walls. <br />6.4.2 Allowable Bearing Value and Lateral Resistance <br />Design of retaining and screen walls may utilize the bearing and lateral resistance values provided in <br />Section 6.3.4 and 6.3.5. <br />6.4.3 Active Earth Pressure <br />Static and seismic earth pressures for level and 2:1 (H:V) backfill conditions are provided in the Table <br />6.3. Seismic earth pressures provided herein are based on the method provided by Seed & Whitman <br />(1970) using a peak ground acceleration (PGA) of 0.35g. This acceleration is based on a 10% <br />probability of exceedance in 50 years. Based on the 2013 CBC, walls that retain less than 6 feet need <br />not be designed for seismic earth pressures. The values provided in the following table are based on <br />typical site materials on drained backfill conditions and do not consider hydrostatic pressure. Retaining <br />walls should be designed to support adjacent surcharge loads imposed by other nearby footings or <br />traffic loads in addition to the earth pressure. <br />ALBUS-KEEFE & ASSOCIATES, INC.