Item 18 - Appeal Application Nos. 2023-02 and 2023-03 for Cabrillo Town Center project

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TABLE 4 Lateral Earth Pressures for Retaininz Walls Conditions Equivalent Fluid Weight (pcf) Level Backfill 2:1 Backfill Sloping Upwards Approved Select Material Approved Select Material Active 35 50 At Rest 55 80 Passive 250 — For design purposes, the recommended equivalent fluid pressure for each case for walls founded above the static ground water and backfilled with approved select soils is provided in Table 4. The equivalent fluid pressure values assume free -draining conditions. If conditions other than those assumed above are anticipated, the equivalent fluid pressure values should be provided on an individual -case basis by the geotechnical engineer. Surcharge loading effects from the adjacent structures should be evaluated by the geotechnical and structural engineers. Retaining wall structures should be provided with appropriate drainage and appropriately waterproofed. The outlet pipe should be sloped to drain to a suitable outlet. Typical wall drainage design is illustrated on Figure 3. It should be noted that the recommended subdrain does not provide protection against seepage through the face of the wall and/or efflorescence. Efflorescence is generally a white crystalline powder (discoloration) that results when water, which contains soluble salts, migrates over a period of time through the face of a retaining wall and evaporates. If such seepage or efflorescence is undesirable, retaining walls should be waterproofed to reduce this potential. For sliding resistance, a friction coefficient of 0.35 may be used at the concrete and soil interface. Wall footings should be designed in accordance with structural considerations. Refer to Sections 4.2.2 for allowable soil bearing. 4.4 Preliminary Pavement Recommendations Asphaltic Concrete Based on a preliminary R-value of 5, we recommend the following preliminary minimum street sections for Traffic Indices of 5, 6, and 7 (Table 5). These recommendations should be confirmed with R-value testing of representative near -surface soils at the completion of grading. Final street sections should be confirmed by the project civil engineer based upon the projected Traffic Index. In addition, additional sections can be provided based on other traffic indices. Table 5 Preliminary Pavement Design Sections Assumed Traffic Index 5 6 7 R-Value Subgrade 5 5 5 AC Thickness 3.5 inches 4.0 inches 5 inches Base Thickness 9.0 inches 12.0 inches 14.0 inches Project i y ouncil 18 — 837 1 316, 2021