Monthly Construction and Environmental Update

West End (SR 79)West End (SR 79)

  • Cross drain pipe and culvert extensions on south end of SR 79 have been completed.
  • Temporary Sediment Basins 31 and 32 (west side of Hwy 79, south of BNB interchange) have been installed.
  • Utility Work in Project Limits
    • Gas utility contractor relocation work delayed due to utility conflict.
    • Jefferson County water line installation (under separate NPDES permit) to begin soon.
    • Utility delay regarding repositioning of AT&T fiber optic lines.  Expected completion date in October.

Mainline and East End (Station 2150 to Station 2235 at SR 75)  

  • Work on local-traffic access road near SR 75 near completion.
  • Archaeology excavation completed west of Self Creek near Station 2185
  • Soil Nail Wall construction ongoing.
  • Retaining Wall foundation work underway from station 2220 to 2234.
  • Retaining Wall precast panel erection has begun near station 2219.
  • Temporary mainline access bridge over Self Creek has been completed.
  • Clearing from Station 2150 to Station 2180 complete.
  • Step Pool Conveyance #3 and Diversion Ditch #3 construction from station 2151 to station 2176 have begun.
  • Temporary, permanent, and post-construction BMPs remain in place.
    • Construction entrances remain stabilized.
    • Disturbed areas are temporarily stabilized with blown or hydraulically-applied mulch; diversion berms,slope drains, and sump excavations have been installed where needed.
    • Sediment barriers installed at buffers, stream and construction limits.
    • Six permanent sedimentation Basins with dewatering devices and baffles are functional.
    • Six Level spreaders associated with permanent sedimentation basins are functional.
    • Temporary slope drains, diversion berms and swales, sumps, and ditch checks installed along haul road areas.

Environmental Status

August 2014:

  • 4 Rain Days: 8/8 (0.86”), 8/9 (0.60”), 8/11 (1.06”), 8/19 (0.89”).
  • Total rainfall for August approximately: 3.41 inches
  • Turbid discharges were observed and reported following the August 11 rainfall event.  BMPs were enhanced.

September 2014:

  • 4 Rain Days: 9/5 (“1.41”), 9/6 (0.39”), 9/13 (0.43”), 9/16 (1.27”)
  • Total rainfall for September approximately: 3.15 inches
  • The rain event on September 4 met the regulatory upset threshold under the NPDES permit.  Turbid discharge and minor sediment loss from the project was observed and reported to ADEM. ADEM conducted a site inspection on 9/26/14.  No violations were noted.