7000 HARDESON RD 2018-01-02 MF Import

' Quadrant 6.917-10260 12 April 1996 Pape a 4.7 Westerly She Permanent slope design is being forwarded under separate cover by WrfH Pacific in conjunction with kttracorp, the property owners of the iriHside and above. In the northwest comer of the site, planned cuts at the toe of the existing slope should be reviewed with respect to the ' planned slope stabilization plan. Preliminary plans provided to us indicate substantial cuts and fills are planned. We anticipate identification of stability problems will be done in the field during construction. Repairs may consist of overexcavation and replacement with quarry spells. 4.8 Pavement Thickness Design Racommendations Driveways and parking lots for the proposed development should be designed and constructed ' in accordance with the following recommendations. Pavement subgrades should be prepared as previously described with the upper foot of the subgrade compacted to a minimum 95 percent modified Proctor density (ASTM:D 1557). Assuming that the pavement is founded upon a subgrade of properly compacted structural fill, a minimum of 2 inches of Class 8 asphaltic concrete over 4 inches of crushed aggregate base course or 3 inches of ATB may be considered adequate for car parking areas. Furthermore, we recommend that pavement sections in the auxiliary bus parking area and driveways and bus/heavy truck traffic areas consist of 4 inches of asphaltic concrete over 6 inches of crushed rock base or 4 inches of ATB. If desired, the following substitutions may be employed: 1 inch Class B asphalt = 2 inches of crushed rock 1 inch Class B asphalt - 1.25 inches asphalt treated base (ATB) 1 inch asphalt treated base (ATB) - 1.6 inches crushed rock Bus parking and traffic areas are planned to be underlain by concrete pavement. Information provided to us indicates that the heaviest loading would be imposed by 60-foot articulated buses, with axle loads of 10, 14, and 21 kips on the front, center, and rear axles. Resultant . maximum wheel loads, considering 4 wheels on the center and rear axles, are about 5,250 pounds on the rear wheels. 7 Based upon the compaction levels referenced in this report, we estimate a resilient modulus (M.R.) of 95 percent compacted site soils equal to 6.000 psi. For concrete pavement placed directly on the compacted site soils, we recommend a minimum unreinforced slab thickness of . 8 inches for the anticipated wheel loads. The slabs should ideally be doweled at all construction joints to minimize differential movements. Joint spacing, for construction joints in plain concrete paving, should not exceed 1 e feet. The ratio of slab width to length should . not exceed 1.25. Further, to minimize infiltration into oe subgrade, joints should be sealed with an appropriate caulking compound. � 1 ■