20250402-003: Walnut Creek WWTP Ordinance Staff Presentation — original pdf

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Walnut Creek Wastewater Treatment Plant Enhancement and Expansion Project Capital Improvement Project 3023.046 Leslie Lilly Watershed Protection Environmental Conservation Program Manager C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T W a l n u t C r e e k W W T P C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 2 Walnut Creek Wastewater Treatment Facility C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 3 Walnut Creek Wastewater Treatment Facility C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 4 Colorado River The Enhancement and Expansion Project C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 5 Construction in the CWQZ LDC 25-8-261 To allow construction of a floodplain wall within a Critical Water Quality Zone (CWQZ). C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 6 Mitigation for impact to CWQZ C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 7 Construction on Slopes LDC 25-8-301 Administrative approval of roadway or driveway constructed on slopes in excess of 15% C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 8 Cut and Fill LDC 25-8-341 To allow cut to be administratively approved up to 25 ft. LDC 25-8-342 To allow fill to be administratively approved up to 25 ft. C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 9 Heritage Trees LDC 25-8-642 & 25-8-643 Administrative approval allowed for removal of two Heritage Trees. C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 10 Other Code Amendments There may be amendments to the following sections of the LDC: • • • Chapter 25-1 Related to general requirements and procedures Chapter 25-5 Related to the approval of multiple site plans Chapter 25-7 Related to the administrative approval of a floodplain variance C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 7 Staff Recommendation Staff recommends approval of the proposed site-specific amendments and associated variances with the following conditions: The project is required to seek administrative variances for proposed development that exceeds or modifies the requirements of: • • • • 25-8-301 (Construction on Slopes) 25-8-341 (Cut Requirements) 25-8-342 (Fill Requirements) 25-8-264 & 25-8-263 (Heritage Trees) For administrative variances granted by this ordinance, the project must demonstrate that no feasible, code compliant design alternatives exist. The project is designed to bore the new effluent waterline under Walnut Creek instead of using an open cut channel. The project extends the CWQZ associated with the southern most segment of Walnut Creek to an area 150% the size of the propos ed impacted CWQZ. The project commits to relocation of impacted heritage trees where feasible. C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 7 • • • • • Questions? C o n t ac t I n f o r m a ti o n : L e s l i e L i l l y ( W P D ) l e s l i e . l i l l y @ a u s t i n t e x a s . g o v C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 8