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trench that has been filled with liquids you may spend hours removing sludge before you can <br /> begin drilling with the regular trash bucket. When the water bucket comes out of bore with little <br /> or no sludge in it you must put trash bucket back on the water bucket is not intended to advance <br /> borehole or remove trash <br /> a. Always prepare for liquid coming out of bore by pre digging a pit to dump water or <br /> sludge into, have material trash or dirt to mix with the liquid so that it can be loaded into <br /> truck without dripping on the surface. <br /> b. Use on site soil as a dike around the pit, depending on make up of trash soils may be <br /> used to help solidify the sludge's. Some soil can be placed in the truck to help with any <br /> liquids that may surface during transport to the working face. <br /> C&D Drilling <br /> This is the hardest drilling and the most notorious for damaging the drill rig. The contents of the <br /> drill spoils are undetermined. It can be anything from concrete to steel I-Beams. When a hard <br /> drilling item is encountered follow this procedure: Lift the bucket above the obstruction and <br /> begin to rotate. Lower the kelly bars until the teeth come into contact with the obstruction. You <br /> will feel when the tips of the teeth are nicking the obstruction. When the bucket turns freely with <br /> out coming into contact with the obstruction then slightly lower the kelly bars again. Continue <br /> this process until the obstruction is passed. When drilling through concrete, after the tips of the <br /> teeth have honed a groove, the drilling will become smooth. The rig will not be bouncing. The <br /> cutting action on concrete will sound like a grinding wheel. If heavy steel is encountered then <br /> the rig will not stop bouncing. At this time, refer to the contract or general notes as to continue <br /> drilling or consult the client for further instruction. If the bouncing and jumping is too hard on <br /> the machine then consult the client representative. It is wise to tell them that the obstruction is to <br /> hard on the machine and drilling on this hole would have to cease. If instructed to continue show <br /> them where the obstruction is in the bore. Begin to rotate above the obstruction slowly lowering <br /> the bucket until the contact is made. When the rig begins to bounce vigorously explain to the <br /> client that the rig was not designed for this type of abuse and further attempts at the obstruction <br /> will shake the rig apart and could cause major damage leading to down time. <br /> Sludge Drilling <br /> Smaller veins of sludge create a smaller problem. When sludge is encountered the first things <br /> that should be installed are the plates that go in the bucket (also used for drilling in water). The <br /> plates will hold more sludge in the bucket but coming out of the bore is the same as water <br /> drilling. The thing you need to know is the top of the sludge layer then how far you can push the <br /> kelly bars through until resistance is encountered. It is very hard to keep drilling through the <br /> sludge what will happen is that the well bore will begin to slough in and a large void will be <br /> created underneath the rig depending how far below the surface the sludge is encountered. The <br /> void will create problems eventually either immediately by caving in under the rig or over time <br /> the area around the well will settle leaving a bowl around the well. If the space occupied by <br /> sludge is more than 10 feet thick and if the sludge is very moist you could drill in that one spot <br /> and not gain any footage. If the sludge has some solidity the drilling will be easier and the <br /> sludge can be drilled through. Completion activities need to be completed immediately because <br /> the sludge will eventually cave in. Depending on where the sludge was encountered the void <br />