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12 . All slabs on grade are to be Regular 3 /4 rock concrete at 3000 psi ultimate <br /> strength at 28 days . NO PUMP MIX, (pea rock) , will be allowed for any <br /> slab on prepared grade. This does not prohibit the pumping of the regular <br /> 3 /4 rock mix . <br /> * * * END OF SECTION * * * <br /> 03010-3 <br />