handtpipeline
Well-Known Member
Ok, my background is in pipeline/utility line work. Over the years, we have also moved a fair amount of dirt. Built ponds, put in roads for sub divisions, house and building pads, etc...
Right now, we are working on a dam for a city resevoir (lake, I know I didn't spell that right...) Anyway, they did away with the earthen spillways on each end of the dam, we cut down about 350' long area in the middle of the dam, and they lined it with Roller Compacted Concrete. Now, we are filling on both ends of the dam, building the slopes and such. The basic fill work is not a problem for us, just loading out of a stockpile, moving, spreading, discing, watering and compacting... No big deal..
The big deal is, the top 5' of fill is gyp-dirt. We have to mix gypsum with the dirt. And nobody here, from us to the general contractor to the federal inspectors have ever been around this... Our first problem is delivery of the gypsum. We are working in south eastern Oklahoma, and the gypsum comes from western Oklahoma. They can only bring us as much as we can use in a day... Second problem, is mixing. Most of the slope is too steep to mix it in place, so we are going to have to mix it in a relatively flat spot, the transport and place it after it's mixed. Third problem is how to mix in the correct proportion... The spec calls for 3 pounds of gypsum per cubic foot of dirt. The mixing spec is to put down 4 1/2" of dirt, a layer of gypsum, another 4 1/2" of dirt, another layer of gypsum, then mixing it with a disc. How can we accurately measure the amount of gypsum and evenly spread it???
ANY ideas would be much appreciated... For equipment, we have our PC200 excavator, a 30 ton Terex arctic truck, a 550g John Deere dozer, a 750J John Deere dozer, Rome disc, large sheepsfoot roller, trench roller and water truck. We are bringing a D9 in to pull the disc, because the 750 won't pull it up the slope. Plenty of power, not enough weight... If we need to get something else to spread the gypsum we will. Just don't know what to get. We've got about 40,000 CY of this stuff to mix up they say.
Right now, we are working on a dam for a city resevoir (lake, I know I didn't spell that right...) Anyway, they did away with the earthen spillways on each end of the dam, we cut down about 350' long area in the middle of the dam, and they lined it with Roller Compacted Concrete. Now, we are filling on both ends of the dam, building the slopes and such. The basic fill work is not a problem for us, just loading out of a stockpile, moving, spreading, discing, watering and compacting... No big deal..
The big deal is, the top 5' of fill is gyp-dirt. We have to mix gypsum with the dirt. And nobody here, from us to the general contractor to the federal inspectors have ever been around this... Our first problem is delivery of the gypsum. We are working in south eastern Oklahoma, and the gypsum comes from western Oklahoma. They can only bring us as much as we can use in a day... Second problem, is mixing. Most of the slope is too steep to mix it in place, so we are going to have to mix it in a relatively flat spot, the transport and place it after it's mixed. Third problem is how to mix in the correct proportion... The spec calls for 3 pounds of gypsum per cubic foot of dirt. The mixing spec is to put down 4 1/2" of dirt, a layer of gypsum, another 4 1/2" of dirt, another layer of gypsum, then mixing it with a disc. How can we accurately measure the amount of gypsum and evenly spread it???
ANY ideas would be much appreciated... For equipment, we have our PC200 excavator, a 30 ton Terex arctic truck, a 550g John Deere dozer, a 750J John Deere dozer, Rome disc, large sheepsfoot roller, trench roller and water truck. We are bringing a D9 in to pull the disc, because the 750 won't pull it up the slope. Plenty of power, not enough weight... If we need to get something else to spread the gypsum we will. Just don't know what to get. We've got about 40,000 CY of this stuff to mix up they say.