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Project No. JB-20100 4 December 2000 Page 13 Subgrade for the on-site paved areas should be properly prepared as discussed in the Earthwork section of this report and as recommended below prior to placing asphalt or aggregate base materials. Proper drainage of paved areas should be provided to prevent water from entering beneath the pavement to help increase the life of the pavement and help avoid possible premature failure. To perform to its greatest efficiency the pavement section requires the following construction criteria: a. Remove organic and deleterious materials from all pavement subgrade. b. Moisture-condition and compact the upper 12 inches of subgrade soil to a minimum relative compaction of 95 percent at a minimum moisture content of 2 percent above the optimum moisture content. All pavement subgrade should be stable with no "pumping" at the time the base rock is placed. c. Use only good quality materials of the type and minimum thickness specified. All base rock should meet the Standard Specifications of the • State of California for Class 2 baserock and should be angular in shape. • d. Compact the baserock uniformly to a minimum relative compaction of 95 percent. e. Place the asphalt concrete only during periods of fair weather when the free air temperature is within the prescribed limits as set forth by the Asphalt Concrete Institute. f. Compact all trench backfill under the pavement to minimize pavement damage resulting from settlement. Mechanical compaction is recommended because material placed by jetting or ponding will probably not attain satisfactory densities. i g. Provide adequate drainage or V-ditch systems to prevent surface i water from migrating into the subgrade pavement soil from behind curb-and-gutter sections. For areas where pavement abuts landscaping, we recommend extending the concrete curb 3 inches below the bottom of the base rock layer to form a cut-off wall to prevent water from migrating into the base rock. r h. The flexural strength of the rigid pavement (concrete pavement) should have a minimum modulus of rupture (MR) of 600 pounds per JaKorbmacher Engineering, Inc.