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KLE/NFELOER �Bright People.Right Solutions. Table 5-6 Portland Cement Concrete Pavement Sections Traffic Portland Cement Class 2 Aggregate Depth of Cement- Index Concrete (inches) Base (inches) or Lime-Treatment inches 5 7 4 -- 6 4 12 8 7'/2 4 -- 6'/2 4 12 Portland cement concrete pavement sections provided in Table 5-6 above are contingent on the following recommendations being implemented during construction. • All trench backfills, including utility and sprinkler lines, should be properly placed and adequately compacted at above optimum moisture content to provide a stable subgrade. All backfill within the streets should be completed prior to lime treating the street subgrade. • Lime-treated subgrade should be kept moist by periodic watering until aggregate base is placed if it will be placed within three days. If aggregate base will not be placed within three days, a sealing compound should be placed on the lime-treated subgrade. • Aggregate base material should conform to the specifications stated in Section 26 of the Caltrans Standard Specifications and be compacted as engineered fill to at least 95 percent relative compaction. • Concrete pavement should have a minimum 28-day compressive strength of 4,000 psi. Concrete slumps should be from 3 to 4 inches. The concrete should be properly cured in accordance with PCA recommended procedures and vehicular traffic should not be allowed for 3 days (automobile traffic) or 7 days (truck traffic). • Although the pavement section design provided above was developed without considering steel reinforcement, to help offset plastic shrinkage and improve long term strength, concrete pavement may be reinforced with at least No. 3 bars, 24 inches on-center, each way or 6x6-W2.OxW2.0 wire mesh (located 1/3 of the slab thickness from the top of the slab). • Construction joint spacing should not exceed 12 feet. 20210067.001A/ST020R111447 Page 30 of 37 May 11, 2020 ©2020 Kleinfelder www.kleinfelder.com