20240501-002: Bridle Ridge at Wildhorse Variance Packet

Environmental Commission – May 1, 2024

20240501-002: Bridle Ridge at Wildhorse Variance Packet — original pdf

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ITEM FOR ENVIRONMENTAL COMMISSION AGENDA COMMISSION MEETING DATE: May 1, 2024 NAME & NUMBER OF PROJECT: Bridle Ridge at Wildhorse Ranch C8-2023-0259 NAME OF APPLICANT OR ORGANIZATION: Kimley Horn (Kevin Burks) LOCATION: 10501 ‰ BLUE BLUFF RD, Austin, TX 78653 COUNCIL DISTRICT: District One ENVIRONMENTAL REVIEW STAFF: Pamela Abee-Taulli, Environmental Program Coordinator Development Services Department 512.974.1879 / pamela.abee-taulli@austintexas.gov WATERSHED: REQUEST: STAFF RECOMMENDATION: STAFF CONDITIONS: Gilleland Creek Watershed, Suburban Classification, Desired Development Zone Variance request is as follows: Request to vary from: 1) 25-8-341 to allow cut over four (4) feet, to 15 feet. 2) 25-8-342 to allow fill over four (4) feet, to 15 feet. Staff recommends this variance, having determined the findings of fact to have been met. 1. Slope stabilization for areas of existing erosion adjacent to the lots, will be provided with grouted rip-rap or approved equivalent method. 2. Slope stabilization in area of cut over 8 feet will be provided by terracing, 25 feet at 15% grade and 20 feet at 5% grade, and revegetation with native grasses and forbs (per Standard Specifications Manual 609S.5). 3. Fill over 8 feet will be contained with engineered walls. 4. The water quality ponds will be biofiltration ponds. Page 1 of 15Development Services Department Staff Recommendations Concerning Required Findings Project Name: Bridle Ridge at Wildhorse Ranch Ordinance Standard: Comprehensive Watershed Ordinance and Wildhorse Ranch Planned Unit Development (PUD) Variance Request: Request to vary from: 1) 25-8-341 to allow cut over four (4) feet, to 15 feet. 2) 25-8-342 to allow fill over four (4) feet, to 15 feet. A. Land Use Commission variance determinations from Chapter 25-8-41 of the City Code: 1. The requirement will deprive the applicant of a privilege or the safety of property given to owners of other similarly situated property with approximately contemporaneous development; Other owners with similarly situate properties and contemporaneous development Yes have received similar variances for grading. Turner’s Crossing (C8J-2018-0091) with cut and fill to 15 feet, Northwind Apartments (SP-2021-0384C.SH) with cut to 12 and fill to 17 feet, and Blueridge Multifamily at Wildhorse Ranch (SP-2022-0426C.SH) with cut to 12 and fill to 10 feet, are all residential projects on sites with rolling topography generally within the 0-15% slope category. In order to comply with the Americans with Disabilities Act (ADA) requiring 2% cross slope at intersection crosswalks on the local and collector roadways, and to meet Transportation Criteria Manual (TCM) requirements for stopping sight distance (for vertical curves and roadway design) and block length maximums, all of these sites were granted variances to exceed the Chapter 25-8 limit of four feet for cut and fill. Is not based on a condition caused by the method chosen by the applicant to develop the property, unless the development method provides greater overall environmental protection than is achievable without the variance; Yes The variance request is not based on a method or design decision chosen by the applicant. Bridle Ridge at Wildhorse Ranch is primarily a single-family residential development with roadways and lot layouts generally designed to follow the existing topography and preserve the natural character of the property. In addition, multiple water quality and detention basins have been provided and placed in natural low areas to preserve the existing drainage patterns. Also, the proposed drainage patterns will maintain flow to the existing wetland. 2. The variance: a. Page 2 of 15Moreover, the development method will provide increased environmental protection by adding stabilization measures in an area of existing erosion that shows potential for future expansion. b. Is the minimum change necessary to avoid the deprivation of a privilege given to other property owners and to allow a reasonable use of the property; and Yes Bridle Ridge at Wildhorse Ranch has been designed to minimally deviate from the code to allow for accessible routes and crossings in compliance with the Americans with Disabilities Act and meet TCM vertical roadway design criteria. The percentage of grading exceeding 8 feet for this property is 4.6%. Specifically, the design accounts for existing constraints such as the elevation of the adjacent connecting roads at City of Austin approved locations and the minimum allowable roadways slopes to allow for ADA compliance. The roadway network has been designed to minimize the number of cross streets to reduce the amount of cut and fill and to maintain compliance with the Transportation Criteria Manual (TCM) block-length requirement. c. Does not create a significant probability of harmful environmental consequences; and The proposed roadways and associated drainage system have been designed to protect the natural character and function of the Critical Environmental Features by ensuring they receive the required surface water runoff quantity and quality needed to promote wetland and floodplain health. In addition, the proposed design preserves the natural drainage patterns by detaining and treating stormwater in multiple basins throughout the property. 3. Development with the variance will result in water quality that is at least equal to the water quality achievable without the variance. The proposed design adheres to all water quality requirements outlined within City code and criteria and as such, will result in water quality that is at least equal to water quality achievable without the variance. In addition, the proposed design preserves the natural drainage patterns by detaining and treating stormwater in multiple basins throughout the property. Finally, as a condition of the variance, the applicant will upgrade from the sedimentation/filtration water quality pond required by the Wildhorse PUD regulations to an environmentally superior biofiltration pond. The Land Use Commission may grant a variance from a requirement of Article 7, Division 1 ( Critical Water Quality Zone Restrictions ), after determining that: B. Additional Land Use Commission variance determinations for a requirement of Article 7, Division 1 (Critical Water Quality Zone Restrictions): 1. The criteria for granting a variance in Subsection (A) are met; Yes Yes NA 2. The requirement for which a variance is requested prevents a reasonable, economic use of the entire property; Page 3 of 153. The variance is the minimum deviation from the code requirement necessary to allow a reasonable, economic use of the entire property. NA NA Staff Determination: Staff determines that the findings of fact have been met and recommends the following conditions: 1. Slope stabilization for areas of existing erosion adjacent to the lots, will be provided with grouted rip-rap or approved equivalent method. 2. Slope stabilization in area of cut over 8 feet will be provided by terracing, 25 feet at 15% grade and 20 feet at 5% grade, and revegetation with native grasses and forbs (per Standard Specifications Manual 609S.5). 3. Fill over 8 feet will be contained with engineered walls. 4. The water quality ponds will be biofiltration ponds. Environmental Reviewer (DSD) _____________________________ (Pamela Abee-Taulli) Date:________________ Environmental Review Manager (DSD) _____________________________ (Mike McDougal) Date ________________ Acting Environmental Officer (WPD) _____________________________ (Liz Johnston) Date ________________ April 15, 202404/17/2024Page 4 of 15THUNDERBOLT LANE ' 0 . 0 5 W O R 5 3 5 5 4 0 L I A R T E K O M E I L L O 5 4 0 N U R R O I N SADDLE RIDGE AT U J R WILDHORSE RANCH E G SECTION 2 G I R 18.548 AC T COA PROJ. NO C8-2020-0033.2A 50.0' ROW 5 3 5 2 2 5 5 2 5 2 2 5 523 5 3 5 524 525 526 527 5 2 5 528 529 5 2 0 5 1 5 5 1 0 4 9 5 4 9 5 EHZ EHZ 5 0 5 505 510 515 520 525 5 3 0 4 4 8 8 0 0 4 4 8 8 0 0 WATER QUALITY & DETENTION POND A MAINTENANCE ACCESS TRAIL Z H E 4 8 5 4 8 5 4 4 8 0 0 8 0 8 4 0 8 4 480 480 5 1 5 5 1 0 5 0 5 0 0 5 4 9 5 EROSION HAZARD ZONE BOUNDARY 0 9 4 Z H E 490 EHZ EHZ 5 1 2 5 1 3 5 0 0 5 1 4 5 1 5 5 1 6 5 0 5 5 1 7 5 1 8 5 1 0 5 1 9 0 2 5 515 1 2 5 520 5 2 5 5 2 5 5 2 2 3 2 5 524 5 2 5 EW 518.0 BW 508.7 TW 519.5 495 WATER QUALITY & DETENTION POND A 500 TW 511.5 BW 504.5 TW 511.8 BW 503.6 BW 500.5 TW 513.0 5 2 0 5 2 5 2 0 1 5 2 5 0 2 0 5 1 9 5 1 5 516 SPIRIT STRIDE PASS (50' ROW) 515 517 517 8 520 1 5 8 1 5 BW 502.0 TW 514.0 0 0 5 5 0 5 510 515 4 9 0 Z H E 4 9 5 Z H E TW 516.8 BW 505.6 Z H E BW 517.2 TW 518.0 Z H E ) R O T C E N N O C E S R O H D L I W W O R 6' 1 1 ( 5 2 5 5 2 4 523 4 2 5 5 2 5 525 9 1 5 H T A E P W) RIK O 530 0' R T 5 Y S (5 K C U L 0 2 5 2 1 5 3 0 5 3 0 522 5 2 3 5 2 6 6 2 5 520 525 530 530 3 5 0 5 3 5 521 522 523 524 5 2 5 5 2 6 5 2 7 5 2 8 5 2 9 526 527 4 8 0 4 8 5 0 9 4 4 9 5 5 0 0 5 0 0 5 0 5 BW 530.0 TW 533.6 EW 529.0 Z H E 5 1 0 515 Z 5 H 2 E 0 5 2 5 EW 526.8 BW 521.7 Z H E TW 525.8 5 3 0 EHZ EW 525.8 D A S HIN (5 G H 0' R A Z O E W W ) A Y 5 2 7 526 5 3 0 525 5 2 4 A M E RIC A (7 N E 2' R C LIP O S W ) E D 5 2 3 RIV E 5 3 5 525 524 5 3 0 525 5 3 0 5 2 5 5 2 5 5 2 0 530 522 523 515 5 2 5 521 5 2 0 5 2 0 5 1 5 23.3920 AC TRAVIS COUNTY LAND DOC NO. 2014081168TR REAR LOT GRADING TO BE TERRACED FOR SLOPE STABILIZATION - 15% FOR 25 FEET - 5% FOR 20 FEET PROSPECTIVE FLOODPLAIN DRAINAGE EASEMENT 4 8 0 565.381 AC HEART OF MANOR LP NATP DOC NO. 2007037703TR GROUTED RIP-RAP OR APPROVED EQUAL SLOPE STABILIZATION METHOD TO BE DESIGNED WITH SUBDIVISION CONSTRUCTION PLANS 4 4 8 0 8 0 EHZ EHZ EW 526.6 Z H E BW 524.2 TW 526.4 EHZ Z H E BW 524.4 TW 528.0 BW 518.4 TW 526.2 Z H E EW 527.5 BW 525.9 TW 527.5 BW 527.0 TW 528.1 524 520 525 5 2 5 5 2 4 5 2 3 522 2 2 5 521 5 2 5 OTH VAL VIE W (50' RO W) O SM 8 1 5 5 1 7 9 1 5 5 2 0 5 3 5 5 3 0 5 2 5 0 2 5 5 1 5 480 480 4 8 0 00 150' 300' GRAPHIC SCALE 150' W WW WWWW OHP W WW LEGEND PROPERTY LINE LOT LINE PROPOSED SIDEWALK PROPOSED WATER LINE PROPOSED WASTEWATER LINE PROPOSED WASTE WATER MANHOLE PROPOSED WASTE WATER CLEANOUT EXISTING OVERHEAD POWER LINE EXISTING WATER LINE EXISTING WASTE WATER LINE EXISTING STORM SEWER LINE EXISTING 50' SETBACK EXISTING CEF COA WETLAND CEF JURISDICTIONAL WATERWAY ATLAS 14 25 YEAR FLOODPLAIN ATLAS 14 100 YEAR FLOODPLAIN > > CREEK CENTERLINE CRITICAL WATER QUALITY ZONE WATER QUALITY TRANSITION ZONE EHZ GAS 600 EROSION HAZARD ZONE EASEMENT LINE GAS LINE EXISTING CONTOUR SLOPES EXCEEDING 15% ON CUT/FILL 4' TO 8' 3710 SQ FT / 0.09 ACRES EXISTING SLOPES EXCEEDING 15% ON CUT/FILL OVER 8' 263 SQ FT / 0.01 ACRES 480485 490 495 500 505 EHZ 510 5 1 5 520 Z H E BW 520.8 TW 527.0 TW 528.0 BW 526.4 528.0 526.7 EHZ 525 5 2 5 Slopes Table Number Minimum Slope Maximum Slope Area Color 1 2 3 4 0.00% 15.00% 25.00% 35.00% 15.00% 29.34 25.00% 35.00% 100.00% 2.34 1.70 0.86 Elevations Table Number Minimum Elevation Maximum Elevation Area Color 1 2 3 4 5 -14.81 -8.00 -4.00 4.00 8.00 -8.00 -4.00 4.00 8.00 14.58 1.05 3.03 4.06 0.62 0.43 5 2 0 516 LIGHT STAR TRACE (72' ROW) 5 1 5 4 1 5 R BENCHMARKS SEE NOTE 4. "X" CUT IN CONCRETE DATUM: BM #105 · BM #101 MAG NAIL WITH WASHER · ELEV.=538.50' ELEV.=492.06' Know what'sbelow. Call before you dig. Y B E T A D I S N O S V E R I . o N . C N I , I S E T A C O S S A D N A N R O H Y E L M K 4 2 0 2 © - I 9 5 7 8 7 X T , I N T S U A , 0 0 2 E T U S I , V I S U P M A C , D A O R E L L I V Y L L O J 4 1 8 0 1 1 9 7 1 - 8 1 4 - 2 1 5 : X A F 1 7 7 1 - 8 1 4 - 2 1 5 : E N O H P . - M O C N R O H Y E L M K W W W I . I I I 8 2 9 - F M R F G N R E E N G N E D E R E T S G E R S A X E T I FOR REVIEW ONLY Not for construction or permit purposes. Engineer P.E. No. KEVIN J. BURKS 133953 Date 04/12/2024 T C E J O R P A H K 0 5 5 4 4 2 9 6 0 E T A D 4 2 0 2 L I R P A N W O H S S A : E L A C S T F C H A E B J K : Y B D E N G S E D I : Y B D E K C E H C : Y B N W A R D I I T B H X E L L I F T U C I T A E G D R E L D R B I H C N A R E S R O H D L I W N A L P Y R A N M I L E R P I I N T S U A F O Y T C I S A X E T , Y T N U O C S V A R T I SHEET NUMBER OF 4 CASE #C8-2023-0259 Page 5 of 15X-1 9.9 ac AREA DESIGNATOR AREA IN ACRES PROPERTY LINE 00 200' 400' > > TC FLOW PATH GRAPHIC SCALE 200' LEGEND PROPOSED DRAINAGE DIVIDE PROPOSED FLOW DIRECTION PROPOSED CONTOUR EXISTING CONTOUR ATLAS 14 25 YEAR FLOODPLAIN ATLAS 14 100 YEAR FLOODPLAIN FEMA 100 YEAR FLOODPLAIN CRITICAL WATER QUALITY ZONE WATER QUALITY TRANSITION ZONE A I L R S U E T 0 ' R . O . W .) Y A K O K O C ( 5 D N E B D ) . W U O . O . L R C ' 0 N 5 ( E D L O G N U R ) . E W C . O I L A . R Y ' 0 5 ( Z A R C N U R E C I L A Y Z A R C ) . . W O R . ' 0 5 ( SADDLE RIDGE AT WILDHORSE RANCH SECTION 1 63.716 AC COA PROJ. NO C8-2020-0033.1B Z I P C O C H I S E W A Y R . O . W . ) ( 5 0 ' > > > > E-A1 > 7.19 ac > > 100 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN 25 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN OS-A 4.63 ac > > > > > > > > POINT OF ANALYSIS A EXISTING CHANNEL Q2 = 130.68 CFS Q10 = 236.84 CFS Q25 = 316.06 CFS Q100 = 463.61 CFS 100 Y R F E M A FL O O D PLAIN . ) . L I A R T H C N A R E S R O H D L I W W O . R E L B A I R A V ( C T R P O - 1 8 1 0 0 0 2 0 2 # C O D > > > > > > > > > > D N U O B H 7 6 1 1 8 T U O 0 4 1 0 8 ) . 2 0 E W 2 C N O 0 R . 7 T A . 5 R 0 P L E L R B 2 # 0 O E C A I R O D M A R V ( A P S E 2 # C O N D A L R E M R A P 42.945 ACRES TITAN TEXAS DEVELOPMENT, LLC D/B/A HOM TITAN DEVELOPMENT, LLC DOC# 2017060636 OPRTC E R IV Y D (5 0' R . O . W .) N P N O D I A I N > > OS-A1 32.44 ac > > > > > > > ) D A O R F F U L B E U L B W O R ' 0 8 ( D > 8 9 0 0 - 2 2 0 2 - P > S # A O C > E-A2 > 1.91 ac > > > > > > > > > > > > > > > > SADDLE RIDGE AT WILDHORSE RANCH SECTION 2 18.548 AC COA PROJ. NO C8-2020-0033.2A E-D1 > 10.29 ac > > > > > > > D R F F U L B E U L B I E D W ' 0 8 ( I . . ) . W O R R E E N G N E Y T N U O C S I V A R T M O R F ( ) 0 7 9 1 C E D / 5 4 0 - 1 . O N N A L P > > OS-D > 4.60 ac > > > > > > > > > OS-D1 > 16.55 ac > C H A ( 5 R G 0 ' E R . R O . W W . ) A Y P A ( V R D A M O R I C A E # B R 2 L L 0 E 1 R 4 . A 0 O 8 . N 1 W E . ) 1 6 7 36.874 ACRES TRAVIS COUNTY DOC# 2014081167 OPRTC WILDHORSE RANCH TRAIL (82' R.O.W.) REMAINDER OF 199.996 ACRES TEXAS WH 200, LP DOC# 2010134600 OPR E N A L R E M R A P ) 8 0 0 - 6 0 - 0 4 4 0 - J S C W O R T O D X T - H T D W E L B A I R A V ( I 25.238 ACRES TITAN TEXAS DEVELOPMENT, LLC D/B/A HOM TITAN DEVELOPMENT, LLC DOC# 2014081167 OPRTC STRAWBERRY ROAN DRIVE (50' R.O.W.) Y A T W RIN 0' R.O.W.) W P (5 A T C O H C STATE HIGHWAY 130 36.874 ACRES TRAVIS COUNTY DOC# 2014081167 OPRTC POINT OF ANALYSIS D SHEET FLOW OFF PROPERTY Q2 = 113.48 CFS Q10 = 216.35 CFS Q25 = 294.00 CFS Q100 = 439.02 CFS 23.3920 AC TRAVIS COUNTY LAND DOC NO. 2014081168TR 100 Y R F E M A FL O O D PLAIN 100 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN > > 25 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN CRITICAL WATER QUALITY ZONE CREEK CENTERLINE WATER QUALITY TRANSITION ZONE > > E-B > 31.82 ac > > > 100 Y R F E M A FL O O D PLAIN > > STATE HIGHWAY 130 (VARIABLE R.O.W.) 100 Y R F E M A FL O O D PLAIN 565.381 AC HEART OF MANOR LP NATP DOC NO. 2007037703TR POINT OF ANALYSIS B EXISTING CHANNEL Q2 = 51.31 CFS Q10 = 106.60 CFS Q25 = 148.88 CFS Q100 = 228.01 CFS E-A 8.88 ac > > > > > > > > > > > E-D > 20.29 ac CREEK CENTERLINE WATER QUALITY TRANSITION ZONE CRITICAL WATER QUALITY ZONE 100 Y R F E M A FL O O D PLAIN 100 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN 25 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN 565.381 AC HEART OF MANOR LP NATP DOC NO. 2007037703TR > > > > > > > > POINT OF ANALYSIS C SHEET FLOW OFF PROPERTY Q2 = 41.50 CFS Q10 = 85.71 CFS Q25 = 119.44 CFS Q100 = 182.48 CFS > > > > E-C 21.17 ac Y B E T A D I S N O S V E R I . o N . C N I , I S E T A C O S S A D N A N R O H Y E L M K 4 2 0 2 © - I 9 5 7 8 7 X T , I N T S U A , 0 0 2 E T U S I , V I S U P M A C , D A O R E L L I V Y L L O J 4 1 8 0 1 1 9 7 1 - 8 1 4 - 2 1 5 : X A F 1 7 7 1 - 8 1 4 - 2 1 5 : E N O H P . - M O C N R O H Y E L M K W W W . I I I I 8 2 9 - F M R F G N R E E N G N E D E R E T S G E R S A X E T I FOR REVIEW ONLY Not for construction or permit purposes. Engineer P.E. No. KEVIN J. BURKS 133953 Date 02/05/2024 T C E J O R P A H K 0 5 5 4 4 2 9 6 0 E T A D 4 2 0 2 Y R A U R B E F N W O H S S A : E L A C S T F C H A E B J K : Y B D E N G S E D I : Y B D E K C E H C : Y B N W A R D I G N T S X E I - I D T B H X E I P A M A E R A E G A N A R D I I T A E G D R E L D R B I H C N A R E S R O H D L I W N A L P Y R A N M L E R P I I I N T S U A F O Y T C I S A X E T , Y T N U O C S V A R T I SHEET NUMBER EX OF 4 CASE #C8-2023-0259 R BENCHMARKS SEE NOTE 4. "X" CUT IN CONCRETE DATUM: BM #105 · BM #101 MAG NAIL WITH WASHER · ELEV.=538.50' ELEV.=492.06' Know what'sbelow. Call before you dig. Page 6 of 15. ) . L I A R T H C N A R E S R O H D L I W W O . R E L B A I R A V ( C T R P O - 1 8 1 0 0 0 2 0 2 # C O D > > > > > > 100 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN 25 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN 00 200' 400' GRAPHIC SCALE 200' LEGEND X-1 9.9 ac AREA DESIGNATOR AREA IN ACRES PROPERTY LINE > > TC FLOW PATH PROPOSED DRAINAGE DIVIDE PROPOSED FLOW DIRECTION PROPOSED CONTOUR EXISTING CONTOUR ATLAS 14 25 YEAR FLOODPLAIN ATLAS 14 100 YEAR FLOODPLAIN FEMA 100 YEAR FLOODPLAIN CRITICAL WATER QUALITY ZONE WATER QUALITY TRANSITION ZONE NOTES: 1. FULL COMPLIANCE WITH THE DCM 1.2.4.E. WILL BE PROVIDED AT THE SITE PLAN OR SUBDIVISION CONSTRUCTION PLAN STAGE. > > > > > > > > > > > > > > OS-C 4.63 ac > > > > POINT OF ANALYSIS A EXISTING CHANNEL Q2 = 129.11 CFS Q10 = 235.39 CFS Q25 = 314.24 CFS Q100 = 462.03 CFS 100 YR FEMA FLOODPLAIN > > > > > > CREEK CENTERLINE N U R ) . E W C . O I L A . R Y ' 0 5 ( Z A R C N U R E C I L A Y Z A R C ) . . W O R . ' 0 5 ( A I L R S U E T 0 ' R . O . W .) Y A K O K O C ( 5 D N E B D ) . W U O . O . L R C ' 0 N 5 ( E D L O G SADDLE RIDGE AT WILDHORSE RANCH SECTION 1 63.716 AC COA PROJ. NO C8-2020-0033.1B Z I P C O C H I S E W A Y R . O . W . ) ( 5 0 ' > > > > ) D A O R F F U L B E U L B W O R ' 0 8 ( W E I V E R Y T I C R E D N U D 8 9 0 0 - 2 2 0 2 - P S # A O C > > > > D-A1 18.15 ac SADDLE RIDGE AT WILDHORSE RANCH SECTION 2 18.548 AC COA PROJ. NO C8-2020-0033.2A > > > > > ) > L I A R T H C N A R E S R O H D L I W W O R 6' 1 1 ( > > D-A (50' ROW) SPIRIT STRIDE PASS 14.34 ac H T A E P W) RIK O T 0' R Y S (5 K C U L 42.945 ACRES TITAN TEXAS DEVELOPMENT, LLC D/B/A HOM TITAN DEVELOPMENT, LLC DOC# 2017060636 OPRTC E R IV Y D (5 0' R . O . W .) N P N O D I A I N > > OS-B > 16.55 ac > > > > > > > D R F F U L B E U L B I E D W ' 0 8 ( I . . ) . W O R R E E N G N E Y T N U O C S I V A R T M O R F ( ) 0 7 9 1 C E D / 5 4 0 - 1 . O N N A L P > > > > > > Y A ) W W E O Z A 0' R G H (5 HIN S A D > > > D-D1 > 1.24 ac > > > > > > D-D 11.81 ac > > N U R E S ) W O LIP R 2' C E N (7 A C I R E M > A > C H A ( 5 R G 0 ' E R . R O . W W . ) A Y P A ( V R D A M O R I C A E # B R 2 L L 0 E 1 R 4 . A 0 O 8 . N 1 W E 1 6 . ) 7 36.874 ACRES TRAVIS COUNTY DOC# 2014081167 OPRTC > > OS-A > 4.60 ac > WILDHORSE RANCH TRAIL (82' R.O.W.) REMAINDER OF 199.996 ACRES TEXAS WH 200, LP DOC# 2010134600 OPR E N A L R E M R A P ) 8 0 0 - 6 0 - 0 4 4 0 - J S C W O R T O D X T - H T D W E L B A I R A V ( I > > POINT OF ANALYSIS D SHEET FLOW OF PROPERTY Q2 = 81.84 CFS Q10 = 150.18 CFS Q25 = 201.38 CFS Q100 = 296.88 CFS 100 YR FEMA FLOODPLAIN 23.3920 AC TRAVIS COUNTY LAND DOC NO. 2014081168TR 25.238 ACRES TITAN TEXAS DEVELOPMENT, LLC D/B/A HOM TITAN DEVELOPMENT, LLC DOC# 2014081167 OPRTC STRAWBERRY ROAN DRIVE (50' R.O.W.) Y A T W RIN 0' R.O.W.) W P (5 A T C O H C WATER QUALITY TRANSITION ZONE 100 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN 25 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN 565.381 AC HEART OF MANOR LP NATP DOC NO. 2007037703TR 100 YR FEMA FLOODPLAIN CRITICAL WATER QUALITY ZONE POINT OF ANALYSIS C SHEET FLOW OF PROPERTY Q2 = 30.13 CFS Q10 = 62.26 CFS Q25 = 86.77 CFS Q100 = 132.59 CFS > > > > > > D-C 17.43 ac > > D-B 25.20 ac OTH VAL VIE W (50' R O W) O SM > > > > > > > > 100 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN 25 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN CRITICAL WATER QUALITY ZONE CREEK CENTERLINE D-B1 13.39 ac WATER QUALITY TRANSITION ZONE 100 YR FEMA FLOODPLAIN > > > > (72' ROW) AMERICAN ECLIPSE RUN > > > > > > > > > > > > > > 565.381 AC HEART OF MANOR LP NATP DOC NO. 2007037703TR POINT OF ANALYSIS B EXISTING CHANNEL Q2 = 49.59 CFS Q10 = 100.68 CFS Q25 = 144.39 CFS Q100 = 225.77 CFS > > > > > > OS-C1 32.44 ac > > > > > > 36.874 ACRES TRAVIS COUNTY DOC# 2014081167 OPRTC STATE HIGHWAY 130 (VARIABLE R.O.W.) Y B E T A D I S N O S V E R I . o N . C N I , I S E T A C O S S A D N A N R O H Y E L M K 4 2 0 2 © - I 9 5 7 8 7 X T , I N T S U A , 0 0 2 E T U S I , V I S U P M A C , D A O R E L L I V Y L L O J 4 1 8 0 1 1 9 7 1 - 8 1 4 - 2 1 5 : X A F 1 7 7 1 - 8 1 4 - 2 1 5 : E N O H P . - M O C N R O H Y E L M K W W W . I I I I 8 2 9 - F M R F G N R E E N G N E D E R E T S G E R S A X E T I FOR REVIEW ONLY Not for construction or permit purposes. Engineer P.E. No. KEVIN J. BURKS 133953 Date 02/05/2024 T C E J O R P A H K 0 5 5 4 4 2 9 6 0 E T A D 4 2 0 2 Y R A U R B E F N W O H S S A : E L A C S T F C H A E B J K : Y B D E N G S E D I : Y B D E K C E H C : Y B N W A R D D E S O P O R P - I E T B H X E I P A M A E R A E G A N A R D I I T A E G D R E L D R B I H C N A R E S R O H D L I W N A L P Y R A N M L E R P I I I N T S U A F O Y T C I S A X E T , Y T N U O C S V A R T I SHEET NUMBER EX OF 4 CASE #C8-2023-0259 R BENCHMARKS SEE NOTE 4. "X" CUT IN CONCRETE DATUM: BM #105 · BM #101 MAG NAIL WITH WASHER · ELEV.=538.50' ELEV.=492.06' Know what'sbelow. Call before you dig. Page 7 of 15November 20, 2023 ENVIRONMENTAL COMMISSION VARIANCE APPLICATION FORM PROJECT DESCRIPTION Applicant Contact Information Variance Case Information Name of Applicant Street Address City State ZIP Code Work Phone E-Mail Address Case Name Case Number Address or Location Environmental Reviewer Name Environmental Resource Management Reviewer Name Applicable Ordinance Watershed Name Kevin Burks, P.E. 10814 Jollyville Rd Building 4, Suite 200 Austin, TX 78759 512-418-4528 Kevin.Burks@kimley-horn.com Bridle Ridge at Wildhorse Ranch C8-2023-0259.CC Pamela Abee-Taulli Hank Marley 25-8-341 & 25-8-342 Gilleland Creek South of the future extension of Wildhorse Connector, Southeast of Wildhorse Ranch Trail and E Parmer Lane in Austin, TX. City of Austin | Environmental Commission Variance Application Guide 1 Page 8 of 15November 20, 2023 Edwards Aquifer Contributing Zone Distance to Nearest Classified Waterway Request Impervious cover square footage: acreage: percentage: Provide general description of the property (slope range, elevation range, summary of vegetation / trees, summary of the geology, CWQZ, WQTZ, CEFs, floodplain, heritage trees, any other notable or outstanding characteristics of the property) Watershed Classification ☐Urban X Suburban ☐Water Supply Suburban ☐Water Supply Rural ☐ Barton Springs Zone Edwards Aquifer Recharge Zone ☐ Barton Springs Segment ☐ Northern Edwards Segment X Not in Edwards Aquifer Zones ☐ Yes X No Gilleland Creek runs just east of Preliminary Plat boundary Water and Waste Water service to be provided by Austin Water Utility The variance request is as follows: 25-8-341 Cut Requirements & 25-8-342 Fill Requirements Existing ____0____ ____0____ ____0____ Proposed 703,495 16.15 47.17% 85.9% of the property falls within the 0% to 15% slope category. The remainder property has slopes exceeding 15% slope. The property ranges in elevation from 535 to 485. There is an assortment of Cedar Elm and Eastern Red Cedar with some Hackberry, Post Oak, Live Oak, and Honey Mesquite within the site; only eleven of which exceed 24 caliper inches. On-site soils are Type D Expansive Clays and is identified as Ferris-Heiden complex and Heiden clay by the USGS web soil survey. One wetland CEFs exist within the site. One Critical Water Quality Zones and one fully developed (25-year and 100-year) floodplain exist within the site. City of Austin | Environmental Commission Variance Application Guide 2 Page 9 of 15November 20, 2023 Clearly indicate in what way the proposed project does not comply with current Code (include maps and exhibits) FINDINGS OF FACT Per the attached cut/fill exhibit, there are areas that require cut/fills greater than 8’. As required in LDC Section 25-8-341, in order to grant a variance, the Land Use Commission must make the following findings of fact: Include an explanation with each applicable finding of fact. Project: Blue Bluff at Wildhorse Ranch Ordinance: 25-8-341 Cut Requirements & 25-8-342 Fill Requirements Land Use Commission variance determinations from Chapter 25-8-341 and 25-8-342 of the City A. Code: 1. The requirement will deprive the applicant of a privilege available to owners of similarly situated property with approximately contemporaneous development subject to similar code requirements. Yes The otherwise developable land located within the 0% to 15% slope category is primarily comprised of slopes closer to 15%. In order to comply with the Americans with Disabilities Act (ADA) requiring 2% cross slope at intersection crosswalks on the local and collector roadways and to meet Transportation Criteria Manual (TCM) requirements for stopping sight distance (for vertical curves and roadway design) and block length maximums, the proposed grades will need to exceed the cut and fill allowed by Chapter 25. This applies to the single-family lots fronting the roadways meeting the ADA and TCM requirements due to access requirements for the lots. The maximum Cut is 14.8 feet. The maximum Fill is 14.6 feet. In addition, the development of adjacent properties will be challenged by the existing topography. It’s highly likely future developments will be pursuing a cut and fill variance request of this magnitude. We also requested and received City of Austin | Environmental Commission Variance Application Guide 3 Page 10 of 15November 20, 2023 2. The variance: a) similar variances on our Saddle Ridge at Wildhorse Ranch project next door (C8- 2020-0033) due to the same TCM design criteria and ADA requirements that were required as part of that subdivision. Is not necessitated by the scale, layout, construction method, or other design decision made by the applicant, unless the design decision provides greater overall environmental protection than is achievable without the variance; Yes b) Yes c) Yes Bridle Ridge at Wildhorse Ranch is primarily a single-family residential development with roadways and lot layouts generally designed to follow the existing topography to preserve the natural character of the property. In addition, multiple water quality and detention basins have been placed in natural low areas to preserve the existing drainage patterns. We are not changing drainage patterns to route runoff to one basin, and intend to maintain adequate runoff reaching the existing wetland CEFs. This variance request is not driven by a design decision on our side. Is the minimum deviation from the code requirement necessary to allow a reasonable use of the property; Bridle Ridge at Wildhorse Ranch has been designed to minimally deviate from the code to allow for accessible routes and crossings in compliance with the Americans with Disabilities Act and meet TCM vertical roadway design criteria. The percentage of the property exceeding 8 feet for this property is 4.6%. Specifically, the design accounts for existing constraints such as the elevation of the adjacent connecting roads at City of Austin approved locations and the minimum allowable roadways slopes to allow for ADA compliance. The roadway network has been designed to minimize the number of cross streets to reduce the amount of cut and fill and to maintain compliance with the Transportation Criteria Manual (TCM) block-length requirement. As such, these cross-streets are required to comply with block length requirements outlined in the code. Does not create a significant probability of harmful environmental consequences. City of Austin | Environmental Commission Variance Application Guide 4 Page 11 of 15November 20, 2023 3. 1. 2. 3. The proposed roadways and associated drainage system have been designed to protect the natural character and function of the Critical Environmental Features by ensuring they receive the required surface water runoff quantity and quality needed to promote wetland and floodplain health. In addition, the proposed design preserves the natural drainage patterns by detaining and treating stormwater in multiple basins throughout the property. Development with the variance will result in water quality that is at least equal to the water quality achievable without the variance. Yes The proposed design adheres to all water quality requirements outlined within the Environmental Criteria Manual and as such, will result in water quality that is at least equal to water quality achievable without the variance. In addition, the proposed design preserves the natural drainage patterns by detaining and treating stormwater in multiple basins throughout the property. Based on preliminary discussions with Staff, we are comfortable upgrading from the standard full sedimentation/filtration ponds to green water quality controls as an effort to obtain environmental superiority with this variance request. B. Additional Land Use Commission variance determinations for a requirement of Section 25-8-422 (Water Quality Transition Zone), Section 25-8-452 (Water Quality Transition Zone), Article 7, Division 1 (Critical Water Quality Zone Restrictions), or Section 25-8-368 (Restrictions on Development Impacting Lake Austin, Lady Bird Lake, and Lake Walter E. Long): The criteria for granting a variance in Subsection (A) are met; N/A to this variance request. The requirement for which a variance is requested prevents a reasonable, economic use of the entire property; N/A to this variance request. The variance is the minimum deviation from the code requirement necessary to allow a reasonable, economic use of the entire property. N/A to this variance request. **Variance approval requires all above affirmative findings. City of Austin | Environmental Commission Variance Application Guide 5 Page 12 of 15THUNDERBOLT LANE ' 0 . 0 5 W O R 5 3 5 5 4 0 L I A R T E K O M E I L L O 5 4 0 N U R R O I N SADDLE RIDGE AT U J R WILDHORSE RANCH E G SECTION 2 G I R 18.548 AC T COA PROJ. NO C8-2020-0033.2A 50.0' ROW 5 3 5 2 2 5 5 2 5 2 2 5 523 5 3 5 524 525 526 527 5 2 5 528 529 5 2 0 5 1 5 5 1 0 4 9 5 4 9 5 EHZ EHZ 5 0 5 505 510 515 520 525 5 3 0 4 4 8 0 8 0 4 4 8 8 0 0 WATER QUALITY & DETENTION POND A MAINTENANCE ACCESS TRAIL Z H E 4 8 5 4 8 5 4 4 8 0 0 8 0 8 4 0 8 4 480 480 5 1 5 5 1 0 5 0 5 0 0 5 4 9 5 EROSION HAZARD ZONE BOUNDARY 0 9 4 Z H E 490 EHZ EHZ 5 1 2 5 1 3 5 0 0 5 1 4 5 1 5 5 1 6 5 0 5 5 1 7 5 1 8 5 1 0 5 1 9 0 2 5 515 1 2 5 520 5 2 5 5 2 5 5 2 2 3 2 5 524 5 2 5 EW 518.0 BW 508.7 TW 519.5 495 WATER QUALITY & DETENTION POND A 500 TW 511.5 BW 504.5 TW 511.8 BW 503.6 BW 500.5 TW 513.0 5 2 0 5 2 5 2 0 1 5 2 5 0 2 0 5 1 9 5 1 5 516 SPIRIT STRIDE PASS (50' ROW) 515 517 517 8 520 1 5 8 1 5 BW 502.0 TW 514.0 0 0 5 5 0 5 510 515 4 9 0 Z H E 4 9 5 Z H E TW 516.8 BW 505.6 Z H E BW 517.2 TW 518.0 Z H E ) R O T C E N N O C E S R O H D L I W W O R 6' 1 1 ( 5 2 5 5 2 4 523 4 2 5 5 2 5 525 9 1 5 H T A E P W) RIK O 530 0' R T 5 Y S (5 K C U L 0 2 5 2 1 5 3 0 5 3 0 522 5 2 3 5 2 6 6 2 5 520 525 530 530 3 5 0 5 3 5 521 522 523 524 5 2 5 5 2 6 5 2 7 5 2 8 5 2 9 526 527 4 8 0 4 8 5 0 9 4 4 9 5 5 0 0 5 0 0 5 0 5 BW 530.0 TW 533.6 EW 529.0 Z H E 5 1 0 515 Z 5 H 2 E 0 5 2 5 EW 526.8 BW 521.7 Z H E TW 525.8 5 3 0 EHZ EW 525.8 D A S HIN (5 G H 0' R A Z O E W W ) A Y 5 2 7 526 5 3 0 525 5 2 4 A M E RIC A (7 N E 2' R C LIP O S W ) E D 5 2 3 RIV E 5 3 5 525 524 5 3 0 525 5 3 0 5 2 5 5 2 5 5 2 0 530 522 523 515 5 2 5 521 5 2 0 5 2 0 5 1 5 23.3920 AC TRAVIS COUNTY LAND DOC NO. 2014081168TR REAR LOT GRADING TO BE TERRACED FOR SLOPE STABILIZATION - 15% FOR 25 FEET - 5% FOR 20 FEET PROSPECTIVE FLOODPLAIN DRAINAGE EASEMENT 4 8 0 565.381 AC HEART OF MANOR LP NATP DOC NO. 2007037703TR GROUTED RIP-RAP OR APPROVED EQUAL SLOPE STABILIZATION METHOD TO BE DESIGNED WITH SUBDIVISION CONSTRUCTION PLANS 4 4 8 0 8 0 EHZ EHZ EW 526.6 Z H E BW 524.2 TW 526.4 EHZ Z H E BW 524.4 TW 528.0 BW 518.4 TW 526.2 Z H E EW 527.5 BW 525.9 TW 527.5 BW 527.0 TW 528.1 524 520 525 5 2 5 5 2 4 5 2 3 522 2 2 5 521 5 2 5 OTH VAL VIE W (50' RO W) O SM 8 1 5 5 1 7 9 1 5 5 2 0 5 3 5 5 3 0 5 2 5 0 2 5 5 1 5 480 480 4 8 0 00 150' 300' GRAPHIC SCALE 150' W WW WWWW OHP W WW LEGEND PROPERTY LINE LOT LINE PROPOSED SIDEWALK PROPOSED WATER LINE PROPOSED WASTEWATER LINE PROPOSED WASTE WATER MANHOLE PROPOSED WASTE WATER CLEANOUT EXISTING OVERHEAD POWER LINE EXISTING WATER LINE EXISTING WASTE WATER LINE EXISTING STORM SEWER LINE EXISTING 50' SETBACK EXISTING CEF COA WETLAND CEF JURISDICTIONAL WATERWAY ATLAS 14 25 YEAR FLOODPLAIN ATLAS 14 100 YEAR FLOODPLAIN > > CREEK CENTERLINE CRITICAL WATER QUALITY ZONE WATER QUALITY TRANSITION ZONE EHZ GAS 600 EROSION HAZARD ZONE EASEMENT LINE GAS LINE EXISTING CONTOUR SLOPES EXCEEDING 15% ON CUT/FILL 4' TO 8' 3710 SQ FT / 0.09 ACRES EXISTING SLOPES EXCEEDING 15% ON CUT/FILL OVER 8' 263 SQ FT / 0.01 ACRES 480485 490 495 500 505 EHZ 510 5 1 5 520 Z H E BW 520.8 TW 527.0 TW 528.0 BW 526.4 528.0 526.7 EHZ 525 5 2 5 Slopes Table Number Minimum Slope Maximum Slope Area Color 1 2 3 4 0.00% 15.00% 25.00% 35.00% 15.00% 29.34 25.00% 35.00% 100.00% 2.34 1.70 0.86 Elevations Table Number Minimum Elevation Maximum Elevation Area Color 1 2 3 4 5 -14.81 -8.00 -4.00 4.00 8.00 -8.00 -4.00 4.00 8.00 14.58 1.05 3.03 4.06 0.62 0.43 5 2 0 516 LIGHT STAR TRACE (72' ROW) 5 1 5 4 1 5 R BENCHMARKS SEE NOTE 4. "X" CUT IN CONCRETE DATUM: BM #105 · BM #101 MAG NAIL WITH WASHER · ELEV.=538.50' ELEV.=492.06' Know what'sbelow. Call before you dig. Y B E T A D I S N O S V E R I . o N . C N I , I S E T A C O S S A D N A N R O H Y E L M K 4 2 0 2 © - I 9 5 7 8 7 X T , I N T S U A , 0 0 2 E T U S I , V I S U P M A C , D A O R E L L I V Y L L O J 4 1 8 0 1 1 9 7 1 - 8 1 4 - 2 1 5 : X A F 1 7 7 1 - 8 1 4 - 2 1 5 : E N O H P . - M O C N R O H Y E L M K W W W I . I I I 8 2 9 - F M R F G N R E E N G N E D E R E T S G E R S A X E T I FOR REVIEW ONLY Not for construction or permit purposes. Engineer P.E. No. KEVIN J. BURKS 133953 Date 04/12/2024 T C E J O R P A H K 0 5 5 4 4 2 9 6 0 E T A D 4 2 0 2 L I R P A N W O H S S A : E L A C S T F C H A E B J K : Y B D E N G S E D I : Y B D E K C E H C : Y B N W A R D I I T B H X E L L I F T U C I T A E G D R E L D R B I H C N A R E S R O H D L I W N A L P Y R A N M I L E R P I I N T S U A F O Y T C I S A X E T , Y T N U O C S V A R T I SHEET NUMBER OF 4 CASE #C8-2023-0259 Page 13 of 15X-1 9.9 ac AREA DESIGNATOR AREA IN ACRES PROPERTY LINE 00 200' 400' > > TC FLOW PATH GRAPHIC SCALE 200' LEGEND PROPOSED DRAINAGE DIVIDE PROPOSED FLOW DIRECTION PROPOSED CONTOUR EXISTING CONTOUR ATLAS 14 25 YEAR FLOODPLAIN ATLAS 14 100 YEAR FLOODPLAIN FEMA 100 YEAR FLOODPLAIN CRITICAL WATER QUALITY ZONE WATER QUALITY TRANSITION ZONE A I L R S U E T 0 ' R . O . W .) Y A K O K O C ( 5 D N E B D ) . W U O . O . L R C ' 0 N 5 ( E D L O G N U R ) . E W C . O I L A . R Y ' 0 5 ( Z A R C N U R E C I L A Y Z A R C ) . . W O R . ' 0 5 ( SADDLE RIDGE AT WILDHORSE RANCH SECTION 1 63.716 AC COA PROJ. NO C8-2020-0033.1B Z I P C O C H I S E W A Y R . O . W . ) ( 5 0 ' > > > > E-A1 > 7.19 ac > > 100 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN 25 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN OS-A 4.63 ac > > > > > > > > POINT OF ANALYSIS A EXISTING CHANNEL Q2 = 130.68 CFS Q10 = 236.84 CFS Q25 = 316.06 CFS Q100 = 463.61 CFS 100 Y R F E M A FL O O D PLAIN . ) . L I A R T H C N A R E S R O H D L I W W O . R E L B A I R A V ( C T R P O - 1 8 1 0 0 0 2 0 2 # C O D > > > > > > > > > > D N U O B H 7 6 1 1 8 0 T U O 4 1 0 8 ) . 2 0 E W 2 C N O 0 R . 7 T A . 5 R 0 P L E L R B 2 # 0 O E C A I R O D M A R V ( A P S E 2 # C O N D A L R E M R A P 42.945 ACRES TITAN TEXAS DEVELOPMENT, LLC D/B/A HOM TITAN DEVELOPMENT, LLC DOC# 2017060636 OPRTC E R IV Y D (5 0' R . O . W .) N P N O D I A I N > > OS-A1 32.44 ac > > > > > > > ) D A O R F F U L B E U L B W O R ' 0 8 ( D > 8 9 0 0 - 2 2 0 2 - P > S # A O C > E-A2 > 1.91 ac > > > > > > > > > > > > > > > > SADDLE RIDGE AT WILDHORSE RANCH SECTION 2 18.548 AC COA PROJ. NO C8-2020-0033.2A E-D1 > 10.29 ac > > > > > > > D R F F U L B E U L B I E D W ' 0 8 ( I . . ) . W O R R E E N G N E Y T N U O C S I V A R T M O R F ( ) 0 7 9 1 C E D / 5 4 0 - 1 . O N N A L P > > OS-D > 4.60 ac > > > > > > > > > OS-D1 > 16.55 ac > C H A ( 5 R G 0 ' E R . R O . W W . ) A Y P A ( V R D A M O R I C A E # B R 2 L L 0 E 1 R 4 . A 0 O 8 . N 1 W E 1 6 . ) 7 36.874 ACRES TRAVIS COUNTY DOC# 2014081167 OPRTC WILDHORSE RANCH TRAIL (82' R.O.W.) REMAINDER OF 199.996 ACRES TEXAS WH 200, LP DOC# 2010134600 OPR E N A L R E M R A P ) 8 0 0 - 6 0 - 0 4 4 0 - J S C W O R T O D X T - H T D W E L B A I R A V ( I 25.238 ACRES TITAN TEXAS DEVELOPMENT, LLC D/B/A HOM TITAN DEVELOPMENT, LLC DOC# 2014081167 OPRTC STRAWBERRY ROAN DRIVE (50' R.O.W.) Y A T W RIN 0' R.O.W.) W P (5 A T C O H C STATE HIGHWAY 130 36.874 ACRES TRAVIS COUNTY DOC# 2014081167 OPRTC POINT OF ANALYSIS D SHEET FLOW OFF PROPERTY Q2 = 113.48 CFS Q10 = 216.35 CFS Q25 = 294.00 CFS Q100 = 439.02 CFS 23.3920 AC TRAVIS COUNTY LAND DOC NO. 2014081168TR 100 Y R F E M A FL O O D PLAIN 100 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN > > 25 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN CRITICAL WATER QUALITY ZONE CREEK CENTERLINE WATER QUALITY TRANSITION ZONE > > E-B > 31.82 ac > > > 100 Y R F E M A FL O O D PLAIN > > STATE HIGHWAY 130 (VARIABLE R.O.W.) 100 Y R F E M A FL O O D PLAIN 565.381 AC HEART OF MANOR LP NATP DOC NO. 2007037703TR POINT OF ANALYSIS B EXISTING CHANNEL Q2 = 51.31 CFS Q10 = 106.60 CFS Q25 = 148.88 CFS Q100 = 228.01 CFS E-A 8.88 ac > > > > > > > > > > > E-D > 20.29 ac CREEK CENTERLINE WATER QUALITY TRANSITION ZONE CRITICAL WATER QUALITY ZONE 100 Y R F E M A FL O O D PLAIN 100 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN 25 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN 565.381 AC HEART OF MANOR LP NATP DOC NO. 2007037703TR > > > > > > > > POINT OF ANALYSIS C SHEET FLOW OFF PROPERTY Q2 = 41.50 CFS Q10 = 85.71 CFS Q25 = 119.44 CFS Q100 = 182.48 CFS > > > > E-C 21.17 ac Y B E T A D I S N O S V E R I . o N . C N I , I S E T A C O S S A D N A N R O H Y E L M K 4 2 0 2 © - I 9 5 7 8 7 X T , I N T S U A , 0 0 2 E T U S I , V I S U P M A C , D A O R E L L I V Y L L O J 4 1 8 0 1 1 9 7 1 - 8 1 4 - 2 1 5 : X A F 1 7 7 1 - 8 1 4 - 2 1 5 : E N O H P . - M O C N R O H Y E L M K W W W . I I I I 8 2 9 - F M R F G N R E E N G N E D E R E T S G E R S A X E T I FOR REVIEW ONLY Not for construction or permit purposes. Engineer P.E. No. KEVIN J. BURKS 133953 Date 02/05/2024 T C E J O R P A H K 0 5 5 4 4 2 9 6 0 E T A D 4 2 0 2 Y R A U R B E F N W O H S S A : E L A C S T F C H A E B J K : Y B D E N G S E D I : Y B D E K C E H C : Y B N W A R D I G N T S X E I - I D T B H X E I P A M A E R A E G A N A R D I I T A E G D R E L D R B I H C N A R E S R O H D L I W N A L P Y R A N M L E R P I I I N T S U A F O Y T C I S A X E T , Y T N U O C S V A R T I SHEET NUMBER EX OF 4 CASE #C8-2023-0259 R BENCHMARKS SEE NOTE 4. "X" CUT IN CONCRETE DATUM: BM #105 · BM #101 MAG NAIL WITH WASHER · ELEV.=538.50' ELEV.=492.06' Know what'sbelow. Call before you dig. Page 14 of 15. ) . L I A R T H C N A R E S R O H D L I W W O . R E L B A I R A V ( C T R P O - 1 8 1 0 0 0 2 0 2 # C O D > > > > > > 100 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN 25 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN 00 200' 400' GRAPHIC SCALE 200' LEGEND X-1 9.9 ac AREA DESIGNATOR AREA IN ACRES PROPERTY LINE > > TC FLOW PATH PROPOSED DRAINAGE DIVIDE PROPOSED FLOW DIRECTION PROPOSED CONTOUR EXISTING CONTOUR ATLAS 14 25 YEAR FLOODPLAIN ATLAS 14 100 YEAR FLOODPLAIN FEMA 100 YEAR FLOODPLAIN CRITICAL WATER QUALITY ZONE WATER QUALITY TRANSITION ZONE NOTES: 1. FULL COMPLIANCE WITH THE DCM 1.2.4.E. WILL BE PROVIDED AT THE SITE PLAN OR SUBDIVISION CONSTRUCTION PLAN STAGE. > > > > > > > > > > > > > > OS-C 4.63 ac > > > > POINT OF ANALYSIS A EXISTING CHANNEL Q2 = 129.11 CFS Q10 = 235.39 CFS Q25 = 314.24 CFS Q100 = 462.03 CFS 100 YR FEMA FLOODPLAIN > > > > > > CREEK CENTERLINE N U R ) . E W C . O I L A . R Y ' 0 5 ( Z A R C N U R E C I L A Y Z A R C ) . . W O R . ' 0 5 ( A I L R S U E T 0 ' R . O . W .) Y A K O K O C ( 5 D N E B D ) . W U O . O . L R C ' 0 N 5 ( E D L O G SADDLE RIDGE AT WILDHORSE RANCH SECTION 1 63.716 AC COA PROJ. NO C8-2020-0033.1B Z I P C O C H I S E W A Y R . O . W . ) ( 5 0 ' > > > > ) D A O R F F U L B E U L B W O R ' 0 8 ( W E I V E R Y T I C R E D N U D 8 9 0 0 - 2 2 0 2 - P S # A O C > > > > D-A1 18.15 ac SADDLE RIDGE AT WILDHORSE RANCH SECTION 2 18.548 AC COA PROJ. NO C8-2020-0033.2A > > > > > ) > L I A R T H C N A R E S R O H D L I W W O R 6' 1 1 ( > > D-A (50' ROW) SPIRIT STRIDE PASS 14.34 ac H T A E P W) RIK O T 0' R Y S (5 K C U L 42.945 ACRES TITAN TEXAS DEVELOPMENT, LLC D/B/A HOM TITAN DEVELOPMENT, LLC DOC# 2017060636 OPRTC E R IV Y D (5 0' R . O . W .) N P N O D I A I N > > OS-B > 16.55 ac > > > > > > > D R F F U L B E U L B I E D W ' 0 8 ( I . . ) . W O R R E E N G N E Y T N U O C S I V A R T M O R F ( ) 0 7 9 1 C E D / 5 4 0 - 1 . O N N A L P > > > > > > Y A ) W W E O Z A 0' R G H (5 HIN S A D > > > D-D1 > 1.24 ac > > > > > > D-D 11.81 ac > > N U R E S ) W O LIP R 2' C E N (7 A C I R E M > A > C H A ( 5 R G 0 ' E R . R O . W W . ) A Y P A ( V R D A M O R I C A E # B R 2 L L 0 E 1 R 4 . A 0 O 8 . N 1 W E 1 6 . ) 7 36.874 ACRES TRAVIS COUNTY DOC# 2014081167 OPRTC > > OS-A > 4.60 ac > WILDHORSE RANCH TRAIL (82' R.O.W.) REMAINDER OF 199.996 ACRES TEXAS WH 200, LP DOC# 2010134600 OPR E N A L R E M R A P ) 8 0 0 - 6 0 - 0 4 4 0 - J S C W O R T O D X T - H T D W E L B A I R A V ( I > > POINT OF ANALYSIS D SHEET FLOW OF PROPERTY Q2 = 81.84 CFS Q10 = 150.18 CFS Q25 = 201.38 CFS Q100 = 296.88 CFS 100 YR FEMA FLOODPLAIN 23.3920 AC TRAVIS COUNTY LAND DOC NO. 2014081168TR 25.238 ACRES TITAN TEXAS DEVELOPMENT, LLC D/B/A HOM TITAN DEVELOPMENT, LLC DOC# 2014081167 OPRTC STRAWBERRY ROAN DRIVE (50' R.O.W.) Y A T W RIN 0' R.O.W.) W P (5 A T C O H C WATER QUALITY TRANSITION ZONE 100 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN 25 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN 565.381 AC HEART OF MANOR LP NATP DOC NO. 2007037703TR 100 YR FEMA FLOODPLAIN CRITICAL WATER QUALITY ZONE POINT OF ANALYSIS C SHEET FLOW OF PROPERTY Q2 = 30.13 CFS Q10 = 62.26 CFS Q25 = 86.77 CFS Q100 = 132.59 CFS > > > > > > D-C 17.43 ac > > D-B 25.20 ac OTH VAL VIE W (50' R O W) O SM > > > > > > > > 100 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN 25 YR ATLAS 14 FULLY DEVELOPED FLOODPLAIN CRITICAL WATER QUALITY ZONE CREEK CENTERLINE D-B1 13.39 ac WATER QUALITY TRANSITION ZONE 100 YR FEMA FLOODPLAIN > > > > (72' ROW) AMERICAN ECLIPSE RUN > > > > > > > > > > > > > > 565.381 AC HEART OF MANOR LP NATP DOC NO. 2007037703TR POINT OF ANALYSIS B EXISTING CHANNEL Q2 = 49.59 CFS Q10 = 100.68 CFS Q25 = 144.39 CFS Q100 = 225.77 CFS > > > > > > OS-C1 32.44 ac > > > > > > 36.874 ACRES TRAVIS COUNTY DOC# 2014081167 OPRTC STATE HIGHWAY 130 (VARIABLE R.O.W.) Y B E T A D I S N O S V E R I . o N . C N I , I S E T A C O S S A D N A N R O H Y E L M K 4 2 0 2 © - I 9 5 7 8 7 X T , I N T S U A , 0 0 2 E T U S I , V I S U P M A C , D A O R E L L I V Y L L O J 4 1 8 0 1 1 9 7 1 - 8 1 4 - 2 1 5 : X A F 1 7 7 1 - 8 1 4 - 2 1 5 : E N O H P . - M O C N R O H Y E L M K W W W I . I I I 8 2 9 - F M R F G N R E E N G N E D E R E T S G E R S A X E T I FOR REVIEW ONLY Not for construction or permit purposes. Engineer P.E. No. KEVIN J. BURKS 133953 Date 02/05/2024 T C E J O R P A H K 0 5 5 4 4 2 9 6 0 E T A D 4 2 0 2 Y R A U R B E F N W O H S S A : E L A C S T F C H A E B J K : Y B D E N G S E D I : Y B D E K C E H C : Y B N W A R D D E S O P O R P - I E T B H X E I P A M A E R A E G A N A R D I I T A E G D R E L D R B I H C N A R E S R O H D L I W N A L P Y R A N M L E R P I I I N T S U A F O Y T C I S A X E T , Y T N U O C S V A R T I SHEET NUMBER EX OF 4 CASE #C8-2023-0259 R BENCHMARKS SEE NOTE 4. "X" CUT IN CONCRETE DATUM: BM #105 · BM #101 MAG NAIL WITH WASHER · ELEV.=538.50' ELEV.=492.06' Know what'sbelow. Call before you dig. Page 15 of 15