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HDD "Fact Sheet" <br />Location of Pipe <br />• Guidance systems for pilot hole are very accurate (ParaTrack 2: ±2%) <br />• Surface casing will control location near surface <br />• Can be surveyed after pipe installation if exact location is critical <br />Vibration <br />• Below noticeable level unless within ±20' of the drill rig (vibration from diesel <br />engine <br />) <br />• Soft soils usually do not transmit vibration created by drilling <br />Noise <br />• Like all construction, elevated sound levels are produced by equipment <br />• Sound barriers greatly reduce noise impacts <br />• Common industry practice to install sound barriers <br />