Excavation Blasting for the MD 355/Rockville Pike Crossing Project at the Medical Center Metro Station

Information blasting related to the Crossing Project:

  • TEST BLASTS:  Controlled test blasts will begin the week of July 10, weather permitting.  There will be three test blasts, one blast per day.  We anticipate test blasts to take place between 9:30 AM and 3:30 PM.  Specific test blast dates are not yet confirmed.
  • LONG-TERM BLASTING SCHEDULE:  When the tests have been concluded, blasting through mid-2018 will occur up to 4-5 times per week (2-3 per week for the elevator shaft, 4-5 per week for the underground tunnel connecting the elevator to the Metrorail mezzanine).
  • NO RUSH HOUR BLASTING:  Blasting won’t occur during peak traffic hours (between 5:30 and 9:30 AM, and 3:30 and 7:30 PM), but could take place during non-peak hours in the daytime or during overnight hours.  Advance notice of nighttime blasting will be provided.
  • NO WEEKEND BLASTING PLANNED:  No weekend blasting is currently planned but may be necessary under special circumstances.  Advance notice of weekend blasting will be provided if necessary.
  • MINIMAL VIBRATIONS:  Very minimal ground vibrations may be felt by some persons.
  • TRAFFIC CLOSURES FOR BLASTING:  It is anticipated that intermittent traffic closures will only be necessary for the initial 4 to 5 weeks of blasting. The need for further traffic closures will be closely monitored during this 4 to 5-week period.  Advance notice will be provided if it is necessary to continue the traffic closures beyond the 4 to 5-week period following the start of blasting.
  • BLAST WARNING HORNS AND TRAFFIC CONTROL:
    • There will be 5 long signals 5 minutes before the blast, and 10 short signals 1 minute before the blast.
    • It is anticipated that only individuals in the project vicinity will hear blast warning horns.
    • 5-10 minutes prior to blast, vehicle and pedestrian traffic will be stopped along Rockville Pike, between Jones Bridge Road and South Wood Drive (Navy Gate #2).
    • An “All Clear” short horn signal will sound after blasting.
    • 1 minute after blast, normal traffic resumes.

Phil Alperson

Military Installations / BRAC Coordinator

Office of the Montgomery County Executive

c/o MCDOT Div. of Transportation Engineering

100 Edison Park Drive, 4th Floor S.E.

Gaithersburg, MD 20878

240-777-2595