Monthly Construction and Environmental Update

West End (SR 79)

  • Construction safety zone in effect along SR79. Speed limit reduced to 45 mph.
  • Traffic remains re-routed over the completed section of new roadway.
  • Section of culvert west of SR79 completed (western half of culvert). Slopes remain stabilized with permanent vegetation, Rolled Erosion Control Products (RECP), and wattles installed at culvert walls and slopes.
  • Eastern half of culvert construction now completed. Remaining northbound roadwork remains to be done. New fill slopes will be seeded and RECP.
  • Asphalt will be placed on newly completed culvert section after paving on SR75 is completed (last week of August).
  • Traffic will be shifted to newly paved asphalt while existing roadway is resurfaced and any remaining work on west side of SR79 is completed.
  • Final traffic stripping will be done after all asphalt is completed (middle to late September).
  • New ditch lines on east side of SR79 that drain north and south of new culvert remain stable with RECP and wattles.
  • Some slope and roadwork between remains to be completed between Ramps.
  • Three Step Pools near Green Drive along Self Creek are functional. All areas remain stabilized with permanent vegetation and RECP.
  • Sediment Basins slopes remain stabilized with permanent seed and RECP.
  • Perimeter controls remain in place along stream to protect water quality.
  • Sediment Retention Barrier (silt fence and hay bales) remain at Self Creek.
  • Sedimentation Basins (with pumps and skimmers) on SR 79 functioning properly. Active stormwater treatment applied as necessary to discharge clean water.
  • General items: Site mowing of all permanent vegetation has been completed.
  • Completed ramp slopes are stabilized with permanent seed and RECP. Completed ramp roads are now “capped” with aggregate.
  • North Access Road and cul-de-sac at Old TN Pike have been paved.
  • “Punch list” work throughout project site has begun.

Mainline (Station 2150 to Station 2235 at SR 75)

On-going construction

  • Soil Nail Wall, and Pneumatic Concrete Blanket completed.
  • Finished slopes stabilized with permanent vegetation.
  • Mainline subgrade has been completely “capped” with small aggregate.
  • Perimeter and other appropriate BMPs being installed as required or needed.

Temporary, permanent, and post-construction BMPs remain in place.

  • Construction entrances remain stabilized with aggregate.
  • Diversion berms, slope drains, and drainage sump excavations have been installed where needed.
  • Sediment barriers installed at buffers, stream and construction limits.
  • Eight permanent and four temporary sedimentation basins with skimmers and baffles are functional. Active stormwater treatment used as necessary to discharge clean water from basins.
  • Eight Level Spreaders associated with permanent sedimentation basins are functional.
  • Temporary slope drains, diversion berms, swales, sumps, wattles, ditch checks, and temporary seed/mulch remain installed.

East End (SR 75)

  • Construction safety zone in effect along SR75. Speed limit reduced to 45 mph.
  • Asphalt paving scheduled to begin August 15, 2016 and should be completed within one week.
  • New ditch line construction on east side of north bound roadway completed.
  • New ditch slopes have been protected with RECP and hay mulch.
  • Detention Basin– Basin soils remain stabilized with permanent vegetation. Perimeter BMPs installed to protect Self Creek.
  • Ramp and access road near church have been paved.
  • Site mowing of permanent vegetation has been completed.
  • Guard rail installation along shoulders is underway, which necessitates temporary lane closures.
  • Temporary lane closures will be in effect periodically as final work items are completed.

Environmental Status this reporting period:

  • 9 Rain Days: 7/5 (0.67”), 7/11 (1.71”), 7/13 (0.16”), 7/15 (2.31”), 7/22 (1.00”), 7/25 (0.38”), 7/26 (0.56”), 7/29 (0.29”), 7/31 (0.72”)
  • Total rainfall for July was approximately 7.8 inches.
  • There were three “qualifying rain events” (greater or equal to 0.75”) during July.
  • Rainfall on July 15, 2016 caused turbid runoff that was observed prior to sampling. ADEM notified on July 15 of turbid discharge.
  • Although ALDOT’s Permit does not require water sampling after “qualifying rain events” samples were collected in accordance with ADEM requirements and all sampled discharges met regulatory turbidity limits.