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• The flatwork at building entry areas should be structurally connected to the perimeter <br />foundation that is recommended to span across the door opening. This recommendation is <br />designed to reduce the potential for differential movement at this joint. <br />• Moisture condition the slab subgrade soils to at least 3 to 5 percent of optimum moisture <br />content, to a depth of at least 12 inches. Adequate moisture conditioning should be verified <br />by the geotechnical engineer 24 hours prior to concrete placement. <br />• Proper concrete curing techniques should be utilized to reduce the potential for slab curling <br />or the formation of excessive shrinkage cracks. <br />• Control joints should be provided at a maximum spacing of 8 feet on center in two directions <br />for slabs and at 6 feet on center for sidewalks. Control joints are intended to direct cracking. <br />Minor cracking of exterior concrete slabs on grade should be expected. <br />• Where flatwork is immediately adjacent to landscape planters, a thickened edge should be <br />utilized. This edge should extend to a depth of at least 12 inches and incorporate longitudinal <br />reinforcement consisting of at least one No. 4 bar. <br />Expansion or felt joints should be used at the interface of exterior slabs on grade and any fixed <br />structures to permit relative movement. <br />6.7 Trash Enclosure Design Parameters <br />The site plan provided to our office indicates that the proposed development will include a trash <br />enclosure. It is expected that the trash enclosure as well as the approach slab will be subjected <br />to relatively heavy wheel loads, imposed by trash removal equipment. <br />The subgrade soils in the area of the trash enclosure and the approach slab should be prepared <br />in accordance with the recommendations for the parking areas, presented in Section 6.3 of this <br />report. As such, it is expected that the trash enclosure will be underlain by structural fill soils, <br />extending to a depth of 1 foot below proposed subgrade elevation. Based on geotechnical <br />considerations, the following recommendations are provided for the design of the trash <br />enclosure and the trash enclosure approach slab: <br />• The trash enclosure may consist of a 6-inch thick concrete slab incorporating a <br />perimeter footing or a turned down edge, extending to a depth of at least 12 inches <br />below adjacent finished grade. If the trash enclosure will incorporate rigid walls such <br />as masonry block or tilt-up concrete, the perimeter foundations should be designed in <br />accordance with the recommendations previously presented in Section 6.5 of this <br />report. <br />• Reinforcement within the trash enclosure slab should consist of at least No. 3 bars at <br />18-inches on-center, in both directions. <br />1 SOUTHERN G&M Convenience Store # 72 - Santa Ana, CA <br />CALIFORNIA PrOJect No. 16G123-1R <br />GEOTECHNICAL Page 24