+---------+--------------------+-----------------------------+ | | Per Cubic Yard | Per linear Foot of Tunnel | | +---------+----------+-------+---------+-----------+ | | Linear | Pounds | Cubic | No. of | Pounds | | | Feet | of | Yards | Feet | of | | | Drilled | Dynamite | | Drilled | Dynamite | +---------+---------+----------+-------+---------+-----------+ | Heading | 5.4-6.0 | 3.9-5.0 | 5.3 |28 to 32.| 20.7-26.5 | +---------+---------+----------+-------+---------+-----------+ | Bench | 2.-2.4 | 1.4-2.0 | 13.7 | 27.-33. | 19.2-27.4 | +---------+---------+----------+-------+---------+-----------+ | Total | 19 | 55.-65. | 39.9-53.9 | +------------------------------+-------+---------+-----------+ | Per cubic yard, whole tunnel section | 2.9-3.4 | 2.1-2.8 | +--------------------------------------+---------+-----------+ +---------------------------------------------------+------------+ | | Number | | Blasting Notes: | of Sticks | | +------------+ | Heading: First Round; 2 to 3 relieving holes | | | sprung with 4 to 5 sticks each | 8 to 15 | | 8 cut holes, 7 sticks each | | | (sometimes shot twice) | 56 to 112 | | First side round, 6 holes, 6 sticks | | | each | 36 | | Widening and dry holes, 10 to 12, | | | 6 sticks each | 60 to 72 | | +------------+ | Total Sticks | 160 to 235 | | +------------+ | Total Pounds | 134 to 196 | | ----------------+------------+ | Sub-bench: 8 holes, 4 to 6 sticks, each | 32 to 48 | | | | | Bench: 8 holes, 6 to 8 sticks, each | 46 to 64 | | Taking up bottom, average | 15 | | +------------+ | Total Sticks | 95 to 127 | | +------------+ | Total Pounds | 79 to 109 | +---------------------------------------------------+------------+ [Illustration: Fig. 3. CROSS-SECTION, LONGITUDINAL SECTION, PLAN]