20201202-002a: Brushy Creek Regional Utility Authority Raw Water Pump Station SP-2020-0228D staff presentation — original pdf

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BRUSHY CREEK REGIONAL UTILITY AUTHORITY RAW WATER PUMP STATION 9416 LIME CREEK ROAD, LEANDER, TEXAS 78641 SP-2020-0228D Jonathan Garner Environmental Program Coordinator Development Services Department SP-2020-0228D Site Location Austin ETJ Austin City Limits Edwards Aquifer Recharge Zone Edwards Aquifer Contributing Zone This product is for informational purposes and may not have been prepared for or be suitable for legal, engineering, or surveying purposes. It does not represent an on-the- ground survey and represents only the approximate relative location of property boundaries. This product has been produced by the Watershed Protection Department for the sole purpose of geographic reference. No warranty is made by the City of Austin regarding specific accuracy or completeness. 0 5 10 Miles[ PROJECT LOCATION PROPERTY DATA • Drinking Water Protection Zone • Water Supply Rural Watershed Classification • Lake Travis Watershed • 2-Mile ETJ Jurisdiction • Not located over Edwards Aquifer Recharge Zone • No Critical Environmental Features BACKGROUND Brushy Creek Regional Utility Authority (BCRUA) is a non- profit local government corporation and a partnership of the cities of Cedar Park, Leander, and Round Rock that treats and distributes water from the Lower Colorado River Authority (LCRA) to residents and businesses of the partner cities. This project is to construct a new raw water pump station to provide service to the partnering communities. EXISTING CONDITIONS PROPOSED SITE PLAN SLOPE EXHIBIT FILL EXHIBIT VARIANCE REQUEST The applicant requests variances from the following sections of code: 1. Request to vary from LDC 25-8-301 to construct private driveways crossing slopes in excess of 15 percent gradient. 2. Request to vary from LDC 25-8-302(A) to construct a surface parking lot on slopes in excess of 15 percent gradient. 3. Request to vary from LDC 25-8-302(B) to construct a building on slopes in excess of 25 percent gradient, and exceed impervious cover allowance on slopes with a gradient of more than 15 percent. 4. Request to vary from LDC 25-8-342 to allow fill in excess of four feet in 5. Request to vary from LDC 25-8-453(D)(1) to allow impervious cover in the Drinking Water Protection Zone. excess of 20 percent Net Site Area. VARIANCE RECOMMENDATION Staff determines that the findings of fact have been met and recommends approval of the variances with the following conditions: • Restoration of disturbed areas within the 40% Natural Area Buffer shall be subject to ECM Appendix A criteria; • Provide robust temporary and permanent erosion and sedimentation controls downgradient of the proposed development beyond the minimum standard; • Provide water quality and detention for an area of offsite impervious cover such that the total amount of impervious cover treated is comparable to only having 20 percent impervious cover onsite • Provide dense screening vegetation in compliance with ECM 2.9.0 for all pervious areas between the building and mechanical equipment and the right-of-way.