20260128-004: 1107 Castle Ridge Rd wastewater service extension request #6290 presentation — original pdf

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1107 Castle Ridge Road Wastewater Service Extension Request #6290 Austin Watershed Protection Department | January 28, 2026 What is a Service Extension Request?  A service extension request is an application for City water or wastewater service from a property owner or developer.  Required when:  a property is more than 100 feet from accessible water/wastewater system or  existing infrastructure isn't adequate for the proposed project demands  May involve the construction of a new line/associated facility or upgrades to existing lines/facilities.  Applicant pays for the associated infrastructure, as outlined in the service extension request. 2 What is a Service Extension Request?  A Service Extension Request requires Council approval if property:  is in Drinking Water Protection Zone and  is outside of the City's full purpose jurisdiction  Environmental Commission and Water & Wastewater Commission make recommendations for support or denial.  No conditions can be put on Service Extension Requests. 3 Background  A Service Extension Request was approved by Council for this property in 2024 and has since expired.  AWP staff recommended against approval of the original request for the same reasons described in this presentation  September 4, 2024 - Environmental Commission recommended against approval  September 11, 2024 – Water & Wastewater Commission motion to approve failed for lack of enough votes  October 10, 2024 – Council approved the wastewater service extension request  This request is identical to the original service extension request. 4 Request Summary  Wastewater Service Request  1107 Castle Ridge Road  2.85 acres  2-mile extraterritorial jurisdiction  Barton Creek Watershed (Barton Springs Zone)  Located in the Edwards Aquifer Contributing Zone  Drinking Water Protection Zone  Subject to Save Our Springs Ordinance. 5 Service Extension Request #6290 Site Location Austin City Limits Austin extraterritorial jurisdiction Edwards Aquifer Recharge Zone Edwards Aquifer Contributing Zone 6 Imagine Austin Growth Concept Map 7 Proposed Development Intended Uses  3 Living Unit Equivalents  Subdivide 2.85-acre lot into three single family residences with driveways and a fire truck turnaround entrance  Existing structure will be removed and replaced  Site plan has not been submitted. 8 Proposed Wastewater Extension  Construct 760 ft of gravity wastewater main from existing 8” gravity wastewater main in Whitemarch Valley Walk  Extend north to & through the subject tract to Castle Ridge Road. 9 Alternative Wastewater Service Texas Land Application Permit (TLAP) Soils  Surface or subsurface irrigation  Brackett-Rock outcrop soils are thin and  Estimated wastewater flow is significantly less than amount required for a TLAP & thus not appropriate for this development. Onsite Sewage Facility (OSSF)  Travis County rules require lot size of at least one acre & would require redesign for only two lots.  Would not necessarily reduce total impervious cover of proposed development. rocky  Not ideal for either system  Severe limitations for septic tank absorption fields and pond construction due to shallow depth of bedrock  Maintenance requirements would increase due to the underlying soils.  Soil piping & preferential flow paths would still likely form, allowing wastewater migration below the root zone. 10 Service Extension Request #6290 Water Service  No City of Austin water service extension request has been requested.  Water service will be provided by Travis County Water Control and Improvement District #10. 11 Extraterritorial Jurisdiction Regulations  Grants property owners the authority to file a petition/request election for release from a city’s extraterritorial jurisdiction  Allows properties to be removed on a lot-by-lot basis  Negatively affects Austin’s ability to regulate environmental and water quality protection requirements  No requirement to comply with City of Austin’s environmental regulations once released. 12 Camelot Subdivision Hills of Lost Creek 1107 Castle Ridge Rd 2-mile extraterritorial jurisdiction Unincorporated Travis County 13 Environmental Impacts  Significant portion of site contains slopes greater than 15%  No critical environmental features  No critical water quality zone/water quality transition zone  Does not drain to occupied salamander habitat  Predominately Unconfirmed Habitat Zone 2  A portion of Lot 1 in Confirmed Habitat Zone 1 for Golden-cheeked Warbler Habitat. 14 Environmental Features Creek lines Critical Water Quality Zone Water Quality Transition Zone 15 Austin Watershed Protection Recommendation  Austin Watershed Protection staff do not recommend approval for the following reasons:  Many areas of slopes greater than 15% and sensitive to impacts of development  Facilitating additional density and impervious cover beyond what exists currently could lead to an overall increase in non-compliance with Save Our Springs Ordinance  If the site were to request removal from Austin’s extraterritorial jurisdiction, it would no longer be subject to Austin’s environmental regulations, including the Save Our Springs Ordinance. 16