Jun 9 2016 Sec 501 2 of the Standard Specifiions include specific requirements of material to be used Plant The inside bearing surface is to be maintained to within 0 002 in of plane Control of the amount of water added to the batch at the concrete mixer is a highly important part of the proportioning process Jun 9 2016 Sec 501 2 of the Standard Specifiions include specific requirements of material to be used Plant The inside bearing surface is to be maintained to within 0 002 in of plane Control of the amount of water added to the batch at the concrete mixer is a highly important part of the proportioning process …