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  2. Major factors limiting the success of a boring operation include the crossing distance, subsurface soil and geologic conditions, and existing topography. Boring operations typically occur over crossing distance of 50 to 60 feet. The maximum length a bore could achieve in ideal soil conditions typically does not exceed 400 feet.
    gaillelaw.com/2018/09/24/comparison-of-pipeline-drilling-methods-bores-hdds-direct-pipes-gaille-energy-blog-issue-75/
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    WEBSep 13, 2017 · This margin or oversize is about 1.2 to 1.5 times the pipe diameter and depends on factors like soil stability, hydrostatic pressure, depth of drilling, etc. Once the pipe is installed, it will have to withstand …

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