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CITY OF AUSTIN PUBLIC WORKS DEPARTMENT SPICEWOOD SPRINGS ROAD REGIONAL MOBILITY IMPROVEMENTS Wastewater Rehabilitation in Critical Natural Resources CONNECTING YOU ALL AROUND AUSTIN Project Location / Background  Critical Pipe Characteristics  Critical Condition- A failure may impact health & safety  Location Characteristics  Erosion Hazard Zone  Possible obstruction in pipe  Pipe is in the bed of tributary of Bull Creek.  Location Characteristics  Edwards Aquifer Recharge Zone according to City of Austin  Golden-cheeked Warbler – Zone 1  Endangered Cave Species Habitat Karst – Zone 1  Critical Water Quality Zone  BCCP zone  Threatened Salamanders in creek  100 YR Floodplain 2 DETERIORATED CONCRETE PIPE (END OF SERVICE LIFE)  Identified Needing Rehabilitation  Approx. 779 LF 18” Concrete Pipe and Manholes (Built 1972) Cured-In-Place Pipe Rehabilitation – Approx. 779 LF 18” pipe to be rehabilitated – Use one manhole MH#40115 to insert liner and other manhole MH#40391 to capture liner – Minimal impact to Environment – Bypass pumping pipe to be routed through the top culvert to minimize impact to salamanders and traffic – Construction method eliminates the need for US Fish and Wildlife permit – Increase life of pipe with minimal disturbance to creek PROPOSED REPLACEMENT N NTS 3 PROJECT DETAILS Construction Cost Estimate $250,000 Area of Parkland needed for temporary use: 1,066 sq. ft. for work area. 6,138 sq. ft. for staging area Permitting Site Plan Development Permit, Temporary traffic control permit from TxDOT, Balcones Conservation Canyon Preserve, Stormwater Pollution Prevention Plan. Design & Permitting Duration 6 months Construction Duration 2 weeks installation; One-month total construction time Construction Method Cured in place Rehabilitation Tree Impact Public Impact Trim trees for clearance Block section of Trail and parking lot while rehabilitating segment in Parkland and during spoils removal. 4