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â€¢ The trash enclosure approach slab should be constructed of Portland cement concrete, at least 6 inches in thickness. Reinforcement within the approach slab should consist of at least No. 3 bars at 18-inches on-center, in both directions. â€¢ The trash enclosure and approach slab subgrades should be moisture conditioned to 2 to 4 percent above the optimum moisture content to a depth of 12 inches. The trash enclosure slab and the approach slab should be structurally connected, to reduce the potential for differential movement between the two slabs. â€¢ The actual design of the trash enclosure and the trash enclosure approach slab should be completed by the structural engineer to verify adequate thickness and reinforcement. 6.8 Retaining Wall Design and Construction Although not indicated on the site plan, some small (less than 3 to 4 feet in height) retaining walls may be required to facilitate the new site grades. The parameters recommended for use in the design of these walls are presented below. Retaining Wall Design Parameters Based on the soil conditions encountered at the boring locations, the following parameters may be used in the design of new retaining walls for this site. We have provided parameters assuming the use of on-site soils for retaining wall backfill. The on-site soils generally consist of silty sands and sandy silts. Based on their classification, these materials are expected to possess a friction angle of at least 28 degrees when compacted to 90 percent relative compaction. If desired, SCG could provide design parameters for an alternative select backfill material behind the retaining walls. The use of select backfill material could result in lower lateral earth pressures. In order to use the design parameters for the imported select fill, this material must be placed within the entire active failure wedge. This wedge is defined as extending from the heel of the retaining wall upwards at an angle of approximately 60Â° from horizontal. If select backfill material behind the retaining wall is desired, SCG should be contacted for supplementary recommendations. RETAINING WALL DESIGN PARAMETERS Design Parameter Soil Type On-site Silty Sands and Sandy Silts Internal Friction Angle (0)28Â° Unit Weight 120 lbs/fti Active Condition (level backfill)43 lbs/ft3 Equivalent Active Condition Fluid Pressure:(2h:lv backfill)76 lbs/ft3 At-Rest Condition (level backfill)64 lbs/ft3 > SOUTHERN G&M Convenience Store # 72 - Santa Ana, CA CALIFORNIA Project No. 16G 123-1R GEOTECHNICAL Page 25