20240904-002: 1107 Castle Ridge Rd WW SER Staff Presentation — original pdf

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1107 Castle Ridge Road Wastewater Service Extension Request #5845 What is a Service Extension Request? • A service extension request (SER) is an application for City water or wastewater service from a property owner or developer. • Required when: system demands – a property is more than 100 ft from accessible water/wastewater – existing infrastructure isn't adequate for the proposed project • 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 SER. SER Process • Requires Council approval if property: – is in Drinking Water Protection Zone and – outside of the City's full purpose jurisdiction • Environmental Commission & Water & Wastewater Commission make recommendations for support/denial • No conditions can be put on SERs. Request Summary • Wastewater Service Request • 1107 Castle Ridge Road • 2.85 acres • 2-Mile ETJ • Barton Creek Watershed (Barton Springs Zone) • Located in the Edwards Aquifer Contributing Zone • Drinking Water Protection Zone (DWPZ) • Subject to Save Our Springs (SOS) Ordinance SER #5845 Site Location Austin City Limits Austin ETJ Edwards Aquifer Recharge Zone Edwards Aquifer Contributing Zone Site Location Proposed Development Intended Uses • 3 Living Unit Equivalents (LUEs) • Subdivide 2.85-acre lot into three single family residences with driveways and a fire truck turnaround entrance • Existing structure will be removed/replaced • Site plan has not yet been submitted. SER #5845 Proposed Wastewater Extension Map provided by AWU SER #5845 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. Alternative Wastewater Service • Soils – Brackett-Rock outcrop soils – Not ideal for land application or Onsite Sewage Facilities (OSSF) • Land application – Issued by the Texas Commission on Environmental Quality (TCEQ) – Flow from proposed development would be significantly less than amount required for TCEQ permit • Onsite Sewage Facility (OSSF) – Travis County rules require lot size of at least one acre – Requires redesign for only two lots – Would not necessarily reduce total impervious cover of proposed development. Water Service • No City of Austin water SER requested • Water service will be provided by Travis County WCID #10. Camelot Subdivision Hills of Lost Creek Senate Bill 2038: ETJ Regulations • Grants property owners the authority to file a petition/request election for release from a city’s ETJ • 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. Environmental Features Creek lines Critical Water Quality Zone Water Quality Transition Zone Environmental Impacts • Significant portion of site contains slopes greater than 15% and is sensitive to impacts of development • 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. WPD Recommendation 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 SOS Ordinance If the site were to request removal from Austin’s ETJ, it would no longer be subject to Austin’s environmental regulations, including the SOS Ordinance.