Water Quality Control on CDOT Projects in the Chatfield Basin - PowerPoint PPT Presentation

Water Quality Control on CDOT Projects in the Chatfield Basin

CDOT OVERSITE  Intense monitoring and inspection conducted during construction  Daily sediment and erosion control inspections  Bi-Weekly inspections  Monthly audits

CDOT OVERSITE  After construction is completed, monitoring and inspections continue  Monthly inspections  Inspections continue until project reaches 70% vegetation

In-Active Construction Projects  I-25 - Meadows to Fifth  US 85 – Sedalia Extensions

Active Projects  US 85 Titan to Cook Ranch  I-25 Douglas Lane to 5 th St.

US 85 – Titan to Cook Ranch Project Information  1 mile of reconstruction  Pilot Project where the Contractor holds the stormwater permit  Cross culverts under US 85 with median inlets  Extension of 6 ft x 6 ft CBC

US 85 – Titan to Cook Ranch Temporary BMPs  Slope roughening  Retention ponds  Tracking pads  Blankets  Erosion logs  Silt Fence  Rock checks

US 85 – Titan to Cook Ranch Permanent BMPs  5 Water Quality Ponds  Drainage ditches to water quality ponds  Utilizing an existing pond  Riprap

Slopes Roughened as Work Progresses

Interim Excavations Capture Surface Runoff and Sediment in retention ponds

Tracking Pads for Vehicles Leaving Site

Riprap Placed in Areas of Concentrated Flows as Permanent BMP

CBC Extended and Temporary BMP Installed

Slopes Stabilized with Topsoil, Soil Amendment, Seed and Mulch.

I-25 Douglas Lane to 5 th St. Project Information  Included reconstruction of I-25/Plum Creek Interchange  Most construction is complete  All water quality structures are built and in operation  Final seeding and planting to be done April/May 2010

I-25 Douglas Lane to 5 th St. Project Information  Pipe work for a water quality pond planned for future project incorporated into this project  Pond to be located East of I-25 and East of the Frontage Rd.  Pond to be constructed by CDOT Maintenance in Summer 2010

Sediment Pond at the NE Quadrant of Interchange

Sediment Pond at the SW Quadrant

Outlet Structure West of I-25 at the Southbound on-ramp

Detention Pond that drains into Plum Creek

Riprap along Plum Creek under the I-25 Bridge

Future Projects under Design  I-25 Lincoln to County Line  I-25 at Happy Canyon  US 85 Cook Ranch to Louviers