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Caltrans Farmington Rd OC - Replace <br /> OGD-N <br /> Drilling Plan <br /> The drilling fluid is contained and recirculated through a closed system utilizing drill rod and a mud <br /> tank. The mud tank will be positioned on the surface of the ground, and serves as a settlement tank <br /> for the soil cuttings,which are periodically removed and placed in 55-gallon steel drums. Once the <br /> desired boring depth has been reached, the hole will be flushed with clear water to displace the <br /> drilling fluid back into the mud tank. The drilling fluid and water will then be pumped from the <br /> mud tank into 55-gallon steel drums for disposal. After the total depth is reached, the boreholes <br /> will be backfilled with bentonite chips, bentonite/cement grout or whatever material specified by <br /> the agencies. The 55-gallon steel drums will be removed from the job site and transferred to an <br /> appropriate staging area, usually a nearby Caltrans Maintenance yard(TransLab). <br /> Hours of Work <br /> Based on the scope of the current project, the drilling operation for this project may take up to one <br /> week to complete. The drillers work schedule is four ten-hour days, Monday through Thursday. <br /> Traffic control and lane closures will be required for all borehole locations along the southbound <br /> lanes. Working during daylight hours is preferred to perform this drilling operation. <br /> Equipment Storage and Staging <br /> Equipment storage for the drilling operation is typically located at the local Caltrans Maintenance <br /> yard (TransLab). Typically, the water tender and trailer are stored at the yard at the end of each <br /> workday. The crew cab and geologist/engineer's vehicles will usually be transported off site at the <br /> end of each workday. <br /> Page 3 of 3 <br />