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HDD Specs Developed For Ohio DOT
Submittal -- Seven specifications mandate that the contractor submit a work plan. Six specifications have a qualifications and personnel section; four specifications direct the contractor to submit shop drawings. Three out of the 10 specifications have material, product data and equipment section; two specifications have a record drawings and closeout section. One specification has the following sections that require submittal of a manufacturer’s certification that products meet or exceed specified requirements; the bore plan; production and as-built drawings; testing, quality control and assurance documentation; supplemental work plan requirements; and construction records.
Drafting the specification
Research and preparation of the standard was a detailed and time-consuming task. The committee’s first meeting was on March 2, 2011. The proposed standard was submitted to the ODOT on Nov. 6, 2012 and approved after modifications on Jan. 28, 2013.
“One of the early struggles with developing specifications for HDD is the wide range of applications in which the HDD technology is used and the different levels of challenges and risks,” states the report. “The specification committee agreed that creating one specification that addresses these challenges and risks is unwise. A separate specification should address the challenges and risks associated with the [maxi] horizontal drilling installations which can be several thousand feet in length and larger in diameter than 24 inches . . . [This specification] was developed for pipes in the range of four inches to 24-inches for pressurized applications. Therefore, Maxi HDD and smaller than four-inch installations are outside the scope of the proposed specifications. Also, HDD installations for gravity applications are excluded from the scope of these specifications.”
Atalah said that, as with any research project, there were ups and downs.
“Changing personnel (ODOT) close to the end of the project provided a little bit of challenge,” he continued. “The wide variations of the HDD projects in terms of complexity and sensitivity to business environments make it difficult to come up with specification that is supposed to be specific, but the specifics may not be workable across the board for all kinds of HDD projects. Balancing the interests of the different interest groups was also challenging.”
The plan for implementing the proposed standard outlines the following steps: