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Project No. D-1885-06 <br />Christ Our Savior Catholic Parish <br />Subject to our review and testing of subgrade "R" values during grading, we recommend <br />the following pavement section for the parking areas for the tested R-value of l8: <br />Assumed A.C A.B. <br />Traffic Condition Traffic Index _(r!)(i!) <br />Parking stalls and 5.5 4 8 <br />driveways <br />Driveways for heary 6.0 4 l0 <br />trucks (trash, etc.) <br />For fire lanes, a pavement section of 6" concrete reinforced with #3 bars at 12" o.c. both <br />ways, over 8" aggregate base compacted to 95% is suitable. A concrete strength of 3,000 <br />psi is acceptable. Expansion joints can be placed at l0 feet o.c. max. <br />At the parking and driveway areas, the top 12 inches of subgrade should be excavated; <br />moisture conditioned and recompacted immediately prior to placing the rock base and <br />asphalt concrete. Rock-base material should be class II aggregate base compacted to <br />minimum 95 percent of its maximum density. <br />Asphalt concrete should be Performance Grade PG 64-10,318" maximum aggregate size <br />and compacted to 95 percent ofHveem laboratory test. <br />Periodic maintenance of asphalt concrete within two to three years period must be done <br />because cracks in asphalt concrete are very common due to temperature changes between <br />summer and winter and day and night and also due to moisture change since both asphalt <br />concrete and concrete are permeable. Seal coating, slurry seal, filling the gaps - crack <br />sealing or crack filling and some other methods are generally used during maintenance. <br />Lateral Earth Pressures: <br />For substructures subject to lateral earth pressure (e.g. any retaining walls lor site <br />development, etc.), the following design parameters should be used: <br />34 <br />f <br />I <br />T <br />I <br />t <br />I <br />I <br />I <br />l <br />t <br />7 <br />T <br />T <br />l.t <br />I <br />I <br />I <br />I <br />I