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Alliance Residence October 18,2016 J.N.: 2530.00 Page 18 Retaining walls supporting backfill should also be coated with a moisture-proofing compound or covered with such material to inhibit infiltration of moisture through the walls. Moisture-proofing material should cover any portion of the back of wall that will be in contact with soil and should lap over and cover the top of footing. A drainage panel should be provided between the water proofing and soil backfill. The panel should extend from the top of the subdrain gravel to within 12 inches of finish grade. The top of footing should be finished smooth with a trowel to inhibit the infiltration of water through the wall. The project structural engineer should provide specific recommendations for moisture-proofing, water stops, and joint details. 6.4.5 Footing Reinforcement and Wall Jointing All continuous footings should be reinforced with a minimum of four No. 4 bars, two top and two bottom. Walls should be provided with cold joints spaced no more than 40 feet apart. The structural engineer may require different reinforcement or jointing and should dictate if greater than the recommendations provided herein. Where recommended removals are limited due to space restrictions, greater reinforcement and closer jointing may be recommended.Specific recommendations should be provided by the geotechnical consultant during grading based on as- built conditions exposed in the field. 6.4.6 Footing Observations Footing excavations should be observed by the project geotechnical consultant to verify that they have been excavated into competent bearing soils and to the minimum embedment recommended herein. These observations should be performed prior to placement of forms or reinforcement. The excavations should be trimmed neat, level, and square. Loose, sloughed or moisture-softened materials and debris should be removed prior to placing concrete. 6.4.7 Retaining Wall Backfill Portions of onsite soils are suitable for use as backfill for retaining walls. Soils used for backfill should not have an EI greater than 50. The backfill zone is defined by a 1 to 1 plane projecting up from the base of the retaining wall. The project geotechnical consultant should approve all backfill used for retaining walls. Wall backfill should be moisture-conditioned to slightly over the optimum moisture content; placed in lifts no greater than 8 inches in thickness, and then mechanically compacted with appropriate equipment to at least 90 percent of the laboratory standard. Hand- operated compaction equipment should be used to compact the backfill placed immediately adjacent the wall to avoid damage to the wall. Flooding or jetting of backfill material is not recommended. 6.5 EXTERIOR FLATWORK Exterior flatwork should be a minimum 4 inches thick. Cold joints or saw cuts should be provided at least every 5 feet in each direction. Flatwork more than 5 feet in width across the minimum dimension should be reinforced with 6" by 6", W2.9 by W2.9 welded wire mesh or No 3 bars spaced 18 inches center to center in both directions. Cold joints should be keyed or provided with dowels spaced 18 inches on center. Such flatwork that meets the structure at points of entry should also be doweled into the footing or grade beam of the structure. Consideration should also be given to doweling flatwork into curbs where they meet. ALBUS-KEEFE & ASSOCIATES, INC.