20220601-003d: 5313 Austin Ready Mix wastewater SER staff presentation REVISED — original pdf

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Austin Ready Mix Wastewater Service Extension Request #5313 What is an SER? • A service extension request, or SER, is an application for City water or wastewater service from a property owner or developer. • SERs are required when a property is located more than 100 feet from an accessible water or wastewater system, or when existing infrastructure isn't adequate for the proposed project demands. • Service may involve the construction of a new line or an associated facility or upgrades to existing lines or facilities. • The applicant pays for the associated infrastructure, as outlined in the SER. SER Process • Per the Land Development Code, SERs require Council approval if the property is in the Drinking Water Protection Zone and outside of the City's full purpose jurisdiction. • Environmental Commission and Water & Wastewater Commission review and make recommendations on SERs that require Council approval. • No conditions can be put on approval of SERs. Request Summary • 4.44 acres • 2-Mile ETJ • Slaughter Creek Watershed, Barton Springs Zone • Located in the Edwards Aquifer Contributing Zone • Drinking Water Protection Zone (DWPZ) • Subject to Save Our Springs (SOS) Ordinance Request Summary • Living Unit Equivalent (LUE) is the typical flow that would be produced by a single-family residence located in a typical subdivision. Standard conversions are applied depending on the proposed use to determine the number of LUEs a project will generate. • 82,000² ft warehouse building with 21 LUEs SER #5313 Site Location Austin City Limits Austin ETJ Edwards Aquifer Recharge Zone Edwards Aquifer Contributing Zone Austin City LimitsETJRechargeContributingAustin City LimitsETJRechargeContributingSite Location Site Location Limited Purpose 2 Mile ETJ SER #5313 Environmental Impacts • No known Critical Environmental Features • No Critical Water Quality Zone or Water Quality Transition Zones onsite • Does not drain to occupied salamander habitat SER #5313 Proposed Wastewater Extension Map provided by Austin Water Water Service • This SER does not require water service. • There is a 12-inch water main on site to connect to in Circle Drive that would meet the fire and domestic needs for the proposed development. SER #5313 Alternative Wastewater Service If service is not extended: 1. On-Site Sewage Facility (OSSF) would not be a feasible alternative for the estimated amount of flow. 2. Apply for a Subsurface Area Drip Dispersal System (SADDS) issued by TCEQ. This would require 1.91 acres for a subsurface dispersal field, on-site storage, and on-site treatment plant, which would be deducted from the net site area calculations associated with impervious cover limits.* *Impervious Cover = 25% Net Site Area (NSA) Staff Recommendation Staff recommends approval • • • Of the options provided, alternative wastewater service through a Subsurface Area Drip Dispersal System issued by the TCEQ is not a preferred option by staff. There are no significant environmental risks to extending service. Providing centralized wastewater service to the site is not likely to facilitate increased development intensity in the area. Contact Information Kaela Champlin Watershed Protection Department City of Austin (512) 974-3443 kaela.champlin@austintexas.gov