This might be a really dumb question here Deanwhy not go with a corrugated steel one that that 312 cat could handle with ease and set a twenty foot section then set the next one and use two head walls precast concrete use premium back fill compacted then compacted dirt and gravel over top for the road . The 450 and the 312 will do the job and the only extra piece of equipment would be a vibrating tamper on the 312 if it is plumed for it . I put in several that size back in my oil field days to make a creek crossing or to make a valley crossing and IF done correctly even a 200000lb + drilling rig and all the support equipment never caved it in and should last fifty years. Lot simpler lot lest money BUT some assembly is required and no big equipment and no over weight and over width permits required just some bolts and some wrenchen .
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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