FERC Approves General Blasting Plan Variance, Allows Use of Ammonium Nitrate

FERC approved Mountain Valley Pipeline’s request for variance “to clarify its General Blasting Plan” March 27. MVP’s original request was filed earlier the same day and asked that FERC approve the request by March 28.

Those subscribing to the FERC eSubscription system for the MVP docket received notification of MVP’s request at 9:51am, then received notice of FERC’s approval of the request at 1:01pm the same day; this could be the fastest turnaround within the FERC’s MVP docket to date.

The following is a list of the changes MVP made to their General Blasting Plan, originally drafted and approved April 2016. Quoted changes within context are underlined:

  • Blasting Specifications: Blasting for pipeline facilities grade or trench excavation, compressor station and interconnect site development will be considered only after all other reasonable means of excavation have been evaluated and determined to be unlikely to achieve the required results.
  • Blasting Requirements, General Provisions: The Contractor shall be responsible for supplying explosives and blasting materials that are perchlorate-free in order to eliminate the potential for perchlorate contamination of ground water, except that detonators containing non-combined amounts of perchlorate, such as Dyno Nobel NONEL EZ Det or equivalent, are an industry standard and shall be permitted. Further, while the use of bulk ammonium nitrate is prohibited, the use of emulsion type explosives, including those having ammonium nitrate as a constituent, such as Dyna 1062 Bulk Emulsion or equivalent, shall be permitted, as these types of explosives are considered industry standard for area blasting related to large scale earthwork construction.
  • MVP Project Contacts and Related Permitting Prior to Blasting (Table 7.1.1): MVP added contact information for the West Virginia Fire Marshall, which requires a permit and notification before blasting occurs
  • Storage Use at Sites: MVP added a provision that Contractors “shall maintain a daily and/or blast inventory record of all explosive materials transported, used, and returned to off-site storage, when no storage is located on the blast site.”
  • Pre-Blast Operations: Dyno Nobel 1062 Bulk Emulsion (or equivalent) was added to the list of explosive and initiation system types that can be used. The substance is described as “an emulsion/gel product commonly used for area blasting such as road alignments or large pads. It contains the following major components: ammonium nitrate (30 to 80% w/w, calcium nitrate, sodium nitrate, and No. 2 diesel fuel (1 to 8% w/w).”

MVP Variance Request MVP-1: General Blasting Plan

FERC Letter Granting Variance Request MVP-1

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