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SECTION 20 HORIZONTAL DIRECTIONAL DRILLING …

20-1 10/98 SECTION 20 HORIZONTAL DIRECTIONAL DRILLING (HDD)/HDPE PIPE SCOPE: A. General: It is the intent of this specification to define the acceptable methods and materials for installing sanitary sewer and water mains by the HORIZONTAL DIRECTIONAL DRILLING method and the requirements for high density polyethylene (HDPE) pipe installed by DIRECTIONAL DRILLING or in open cut trenches. B. Installation Plan: 1. At least 7 days prior to mobilizing equipment Contractor shall submit his detailed installation plan to the Engineer. The plan shall include a detailed plan and profile of the bores and be plotted at a scale no smaller than 1 inch equals 20 feet HORIZONTAL and vertical .

actual horizontal and vertical alignment of the pilot bore at intervals not exceeding 30 feet. This “as built” plan and profile shall be updated as the pilot bore is advanced. The Contractor shall at all times provide and maintain instrumentation that will accurately locate the pilot hole and measure drilling fluid flow and pressure.

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