Precast Concrete Manhole Collars

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Concrete: 5,000 psi @ 28 days
                  5% - 8% entrained air
Rebar: ASTM A-615 grade 60
Design criteria: a) ASTM C585
                            b) Loading per ASTM C857, including:
                                -Earth cover: Min 2' - 0" Max 5' - 0"
                                -AASHTO HS-20 wheel load & applicable 
                                 impact
                                -Vertical & lateral soil pressures determined
                                 using 120 PCF soil density
                            c) Ground water at 3' - 0" below grade
                            d) Reinforcing cover per ACI 318
Weight:
4" collar plain: 310#
6" collar plain: 465#
6" collar with step: 475#
12" collar plain: 915#
12" collar with step: 925#
7" x 24" ID collar: 950#