1. Contractor to Excavate to 6” below bottom of concrete elevation and Demo existing concrete low water crossing. 2. Place, compact and backfill with 6” road base to bottom of new concrete elevation. 3. Contractor to Construct 2 – Barrel 8’ Span x 6’ Height cast-in-place Box Culvert x 26’-0” in length (out-to-out of headwall Roadway Width) with 4 - 12’ long Parallel Wing Walls at 45 Degree Skew per TxDot Standard Multiple Box Culverts Drawings listed below: a) MC-MD – Multiple Box Culverts Cast-in-place Miscellaneous Details – Plan of Skewed Ends – Over 30 degrees to 45 degrees b) MC-8-13 - Multiple Box Culverts Cast-in-place 8’ Span 0’-13’ Fill c) PW – Concrete Wingwalls with Parallel Wings for Box Culverts TYPE PW-1 4. Bastrop County will provide Flow-Line elevation benchmark. 5. Bastrop County will locate Upstream Centerline of Boxes. 6. Contractor to excavate to 6’ below grade and backfill with 6” flex-base. 7. The Box Culvert and Wingwalls must be constructed ½ at a time to allow for traffic to remain live. This is a one way in and one way out dead-end road. 8. Contractor to provide, place and compact backfill in 6” lifts maximum for roadway and backside slopes to within 10” of Top of Box with select fill. 9. Contractor to provide, place and compact 10” of road base in 6” lifts maximum, per TxDOT Item #247 to top of box elevation. 10.Curb Height is 0”
