20221116-004: 1703 N River Hills Rd Marina Reconstruction SP-2022-0167D staff presentation — original pdf

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Pamela Abee-Taulli Environmental Program Coordinator, Development Services Department Miranda Reinhard Environmental Scientist Senior, Watershed Protection Department 1703 N. RIVER HILLS ROAD MARINA RECONSTRUCTION 1703 RIVER HILLS RD, 78733 SP-2022-0167D 2022-11-16 1 PROJECT LOCATION 2022-11-16 2 [ PROJECT LOCATION Project Location Lake Austin Capitol 2022-11-16 3 [ PROPERTY DATA • Lake Austin Watershed • Water Supply Rural Classification • Drinking Water Protection Zone • Full and Limited Purpose Jurisdictions • No creeks or creek buffers; two (2) wetland Critical Environmental Features; Lake Austin buffer • Council District 10 2022-11-16 4 [ VARIANCE REQUESTS LDC 25-8-261CRITICAL WATER QUALITY ZONE DEVELOPMENT 1. to allow, in the CWQZ of Lake Austin, development of a gasoline fuel line with a dispenser at the dock for re-fueling private boats. LDC 25-8-368 (E) - RESTRICTIONS ON DEVELOPMENT IMPACTING LAKE AUSTIN, LADY BIRD LAKE, AND LAKE WALTER E. LONG. (E) 2. to allow, more than 25 cubic yards of dredging in Lake Austin. 2022-11-16 5 VARIANCE REQUEST 1 Request to vary LDC 25-8-261CRITICAL WATER QUALITY ZONE DEVELOPMENT to allow, in the CWQZ of Lake Austin, development of a gasoline fuel line with a dispenser at the dock for re-fueling private boats. 2022-11-16 6 SITE 2022-11-16 +/- 10’ high ‘Cliff’ Lake Austin 7 [ SITE 2022-11-16 100’ CWQZ setback +/- 10’ high ‘Cliff’ Lake Austin 8 [ SITE 2022-11-16 100’ CWQZ setback Wetland +/- 10’ high ‘Cliff’ Lake Austin 9 [ Cluster of trees Fuel line above ground Fuel line below ground FUEL LINE LAYOUT Fuel tank 2022-11-16 Lake Austin 10 [ FUEL LINE LAYOUT Fuel line above ground Fuel line below ground Wetland Fuel tank 2022-11-16 The layout avoids the wetland. Lake Austin 11 [ FUEL LINE LAYOUT Fuel tank 2022-11-16 Fuel line above ground Fuel line below ground The layout avoids the wetland. But it goes through the cluster of trees. Cluster of trees Lake Austin 12 [ RAW WATER INTAKE FOR TRAVIS COUNTY WATER CONTROL AND IMPROVEMENT DISTRICT #20 Travis County Water Control and Improvement District (WCID) #20 has a water treatment plant (WTP) on the lot adjacent to the variance site. The raw water intake for the WTP is approximately 800 feet downstream of the variance site. 2022-11-16 Water Treatment Plant Intake 1000’ Buffer 13 RAW WATER INTAKE FOR TRAVIS COUNTY WATER CONTROL AND IMPROVEMENT DISTRICT #20 The water treatment plant for WCID #20 typically treats approximately 1 million gallons of water per day during peak periods. The overwhelming majority of the water treated and distributed by the District is used by residents for drinking water and other typical domestic uses. WCID #20: • Provides potable water service to approximately 300 homes with a total estimated population of 1,100 persons. • Covers approximately 1,038 acres. • Contracts with the LCRA to purchase raw water and relies exclusively on Lake Austin as its raw water source to treat and distribute potable water to its customers. 2022-11-16 14 VARIANCE RECOMMENDATION • Staff determines that the findings of fact have not been met: • Variances have not been granted for projects with similar code requirements, the most recently approved fueling operation on Lake Austin having been approved in 1985. The variance • Is necessitated by the applicant’s design choice and does not provide greater overall environmental protection; Is not the minimum deviation necessary to allow a reasonable use of the property, as the marina and business allow reasonable use; and Creates a significant probability of harmful environmental consequences. • • • Water quality will not be equal to or better than water quality without the variance. 2022-11-16 15 VARIANCE REQUEST 2 Request to vary LDC 25-8-368 (E) - RESTRICTIONS ON DEVELOPMENT IMPACTING LAKE AUSTIN, LADY BIRD LAKE, AND LAKE WALTER E. LONG. (E) to allow, more than 25 cubic yards of dredging in Lake Austin. 2022-11-16 16 EXISTING PROPOSED VARIANCE REQUEST 2 • Existing marina built prior to 1965 • Replace/Rehabilitate • Existing 21 slips • Proposed 16 code- compliant slips • Within the existing footprint 2022-11-16 17 PROPOSED DREDGE VARIANCE REQUEST 2 Dredge Requirements • LDC 25-8-368 (E) allows 25 CY dredge per site plan • Proposing 6.1 CY per slip, total of 97.4 CY • If 25 CY per slip, would be total of 400 CY • Per slip: 6.1 CY < 25 CY • Total: 97.4 CY < 400 CY 2022-11-16 18 WEST HARBOUR MARINA DREDGE VARIANCE REQUEST 2 Similar Property Example • West Harbour Marina (SP-2018-0221C) • Dredge Variance granted in 2019 • ~16 CY per boat slip, total of 422 CY • This variance: • 6.1 CY per slip, total of 97.4 CY • Per slip: 6.1 CY < 16 CY • Total: 97.4 CY < 422 CY 2022-11-16 19 VARIANCE REQUEST 2 Enhancements: • Sediment Boom • Temporary Orange Construction Fencing • Additional Wetland Mitigation Wetland Temporary Construction Fencing Additional Wetland Mitigation Lake Austin 2022-11-16 20 Sediment Boom/ Turbidity Curtain VARIANCE REQUEST 2 Enhancements: • Additional Wetland Mitigation Wetland Required Wetland & Bulkhead Mitigation Additional Wetland Mitigation 2022-11-16 21 VARIANCE RECOMMENDATION Staff determines that the findings of fact have been met: • Similar variances have been granted for projects with similar code requirements. • The variance • • • Is necessitated by topographic features, not design choice; Is the minimum deviation from the code; and Is unlikely to result in harmful environmental consequences. • Water quality will be equal to or better than water quality without the variance. 2022-11-16 22 VARIANCE CONDITIONS Staff recommends this variance, with the following conditions: Install sediment boom 1. 2. Install temporary orange construction fencing around wetland CEF 3. Provide additional wetland mitigation 2022-11-16 23 THANK YOU Questions? 2022-11-16 2424