B-16 SP-2021-0079C - Sky Mountain; District 8 Part3.pdf

Zoning and Platting Commission – July 12, 2022

B-16 SP-2021-0079C - Sky Mountain; District 8 Part3.pdf — original pdf

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) W O R ' 0 5 1 ( 1 7 H S W N TIO C E S R E T IN 7 1 1 9 1 O F O F O F ZONING:AG-NP K C A B T E S ' 5 2 5 1 0 0 9 6 H F 6 0 0 0 9 6 3 1 0 0 9 6 N W O N K N U 2 0 2 4 2 N TIO C E S R E T IN N TIO C E S R E T IN N W O N K N U 4 7 2 4 3 2 0 8 2 4 3 2 1 8 2 4 3 2 5 8 2 4 3 2 6 8 2 4 3 2 H F O F O F O F ROW DEDICATION AND FUTURE MOUNTAIN SHADOWS DRIVE IMPROVEMENTS BY OTHERS ZONING: AG-NP INTERSECTION 11070 ZONING: MF-1-NP INTERSECTION 19650 MOUNTAIN SHADOWS DR. 226024 INTERSECTION 23376 INTERSECTION 9047 ZONING: MF-1-NP ZONING: MF-1-NP ZONING: RR-NP 25' BLDG SETBACK 25' BLDG SETBACK 15' STREET SIDE SETBACK LOT 1, BLOCK A MOUNTAIN CREST SUBDIVISION ZONING: LR-MU-NP S W O D A H S N A T N U O M I ZONING: MF-1 F-1 G: M NIN O Z F-1 G: M NIN O Z F-1 G: M NIN O Z 5' INTERIOR SETBACK F-1 G: M NIN O Z P R-N G: R NIN O Z K C A B T E S R O R E T N I I ' 5 ZONING: MF-1 N28°12'59"E 404.99' PROPOSED D.E. DOC. #____________ BY PLAT K C A B T E S R O I R E T N I 5' ZONING: MF-1 5' INTERIOR SETBACK ZONING: MF-1-NP ZONING:MF-1 ZONING: MF-1 . I R D N A T N U O M Y K S K C A B T E S R O R E T N I I ' 5 ' 5 0 . 5 2 3 ' W " 7 0 3 5 ° 1 6 N ' 1 0 . 5 2 5 ' W " 7 4 2 5 ° 1 6 N ' 2 9 . 4 2 3 ' E " 1 5 2 5 ° 1 6 S S28°14'30"W 399.04' N28°17'57"E 381.31' 5' INTERIOR SETBACK ZONING: MF-1-NP 5 ' I N T E R I O R S E T B A C K ZONING: CS-NP ZONING: RR 100 50 0 100 200 SCALE IN FEET INTERSECTION 11068 O L D B E E C A V E S BELL DR. M O U N T A I N C R E S T . R D T S E R C N A T N U O M I K C A B T E S D R A Y T N O R F ' 5 2 ZONING: LO-CO N TIO C E S R E T IN 1 8 3 3 2 P O-N O-C G:W/ L NIN O Z P O-N O-C G: W/L NIN O Z N TIO C E S R E T IN 2 8 3 3 2 10' REAR SETBACK ZONING: GR-NP ZONING: GR-NP 1.25 - ACRES CUT / FILL AND CONSTRUCTION ON SLOPES REGULATED BY RCA (DOC. #2020164458) COVERED BRIDGE DR. 10' REAR SETBACK 418.41' 25.68' 24.98' 450.13' ZONING: MF-1 10' REAR SETBACK INTERSECTION 26854 INTERSECTION 26853 TRAVIS COOK RD. I N A T N U O M Y K S T N E M P O L E V E D E T S R O F S N A L P I I I I I T B H X E S N O T D N O C G N T S X E I I S A X E T , I N T S U A , 1 7 H S W 2 2 7 8 I S N O S V E R I E T A D Y B I I N O T P R C S E D . O N 9 1 0 2 / 2 1 / 7 : E T A D I I G N T S X E - 1 0 4 0 - 9 3 4 A . G W D S N O T D N O C I I : E M A N G N W A R D I H B R K L J : Y B D E N G S E D I : Y B N W A R D H B R : Y B D E K C E H C NOT FOR CONSTRUCTION FOR REVIEW PURPOSES ONLY 6 8 3 1 - F - N R F 6 1 7 4 . 9 3 4 . 2 1 5 x a F 0 0 7 4 . 9 3 4 . 2 1 5 e n o h P . c n I , i g n i r e e n g n E A J L l d r a v e u o B o t l a R 0 0 5 7 i 0 0 1 e t i u S , I I g n d i l i u B 5 3 7 8 7 s a x e T , n i t s u A LEGEND EXISTING W OU E E T F T G CONTOUR LINE CONCRETE SIDEWALK STORM SEWER LINE WASTEWATER LINE WATER LINE WATER VALVE FIRE HYDRANT WASTEWATER MANHOLE STORMSEWER MANHOLE WATER METER UTILITY POLE OVERHEAD UTILITIES ELEC. UTILITY ELEC. MANHOLE LIGHT POLE TELEPHONE UTILITY 1/2" REBAR FOUND (OR AS NOTED) CH 1/2" REBAR WITH CAP FOUND 1/2" REBAR WITH CHAPARRAL CAP SET UNDERGROUND FIBER OPTIC MARKER TELEPHONE MANHOLE UNDERGROUND GAS MARKER CHAIN LINK FENCE LOCATION OF EXISTING UNDERGROUND AND OVERHEAD UTILITIES ARE APPROXIMATE LOCATIONS ONLY. THE CONTRACTOR SHALL DETERMINE THE EXACT LOCATION OF ALL EXISTING UTILITIES PRIOR TO BEGINNING WORK AND SHALL BE FULLY RESPONSIBLE FOR ANY AND ALL DAMAGES WHICH MIGHT OCCUR. JOB NUMBER: A439-0401 EX01 R SHEET NO. Know what's below. Call before you dig. OF 11 SHEETS SP-2021-0079C 1 of 46/// / / / /// /// /// / / / / / / / / / / / / / / / / / / / / / ZONING: MF-1-NP X /// /// /// /// /// MOUNTAIN SHADOWS DR F-1 G: M NIN O Z F-1 G: M NIN O Z P R-N G: R NIN O Z F-1 G: M NIN O Z 15' STREET SIDE SETBACK /// /// / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /// K C A B T E S R O R E T N I I ' 5 K C A B T E S Y T L B T A P M O C I I I ' 0 0 1 ZONING: MF-1-NP ZONING: MF-1-NP ZONING: RR-NP X X X X X X X X /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// 5' INTERIOR SETBACK 25' COMPATIBILITY SETBACK 50' COMPATIBILITY SETBACK 100' COMPATIBILITY SETBACK D R ZONING:MF-1 ' 5 0 . 5 2 3 ' W " 7 0 3 5 ° 1 6 N ' 1 0 . 5 2 5 ' W " 7 4 2 5 ° 1 6 N ' 2 9 . 4 2 3 ' E " 1 5 2 5 ° 1 6 S 300' COMPATIBILITY SETBACK C D F R C S C D SCRF ZONING: MF-1 N28°12'59"E 404.99' PROPOSED D.E. DOC. #____________ BY PLAT ZONING: MF-1 7 4 9 0 5 9 0 5 9 7 4 9 2 5 9 0 5 9 ZONING: MF-1 S28°14'30"W 399.04' N28°17'57"E 381.31' 540' COMPATIBILITY SETBACK ZONING: MF-1-NP FDC 540' COMPATIBILITY SETBACK C D SCR F 0 5 9 947 0 5 9 5 4 9 0 4 9 948 9 4 0 9 4 5 9 4 5 9 4 0 9 4 0 9 4 5 9 4 5 9 4 0 5 ' I N T E R I O R S E T B A C K ZONING: CS-NP 10' REAR SETBACK // // 418.41' // // // // 25.68' 24.98' // // // // 450.13' // // // // 10' REAR SETBACK 10' REAR SETBACK K C A B T E S R O I R E T N I ' 5 ZONING: MF-1 / / / /// /// / / / /// /// / / / 5' INTERIOR SETBACK 25' COMPATIBILITY SETBACK 50' COMPATIBILITY SETBACK ZONING: MF-1-NP 100' COMP SETBACK / / / l l K C A B T E S D R A Y T N O R F ' 5 2 / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / O O O O O O O O O O O O O O O O O O O O O O O O O O O O 300' COMPATIBILITY SETBACK 5' INTERIOR SETBACK E 50 25 0 50 100 SCALE IN FEET LEGEND PROPOSED EXISTING 872 CONTOUR LINE ST WW WL RWL IR WW ST CONCRETE SIDEWALK PERVIOUS SIDEWALK SIDEWALK RAMP HANDICAPPED PARKING SPACE & SIDEWALK RAMP CROSSWALK STORM SEWER LINE WASTEWATER LINE WASTEWATER SERVICE WATER LINE WATER SERVICE CONDENSATE RECOVERY IRRIGATION LINE TREE TO REMAIN PROTECTED TREE TO REMAIN HERITAGE TREE TO REMAIN TREE TO BE REMOVED WATER VALVE FIRE HYDRANT WASTEWATER MANHOLE STORMSEWER MANHOLE CURB INLET GRATE INLET 1/2" REBAR FOUND (OR AS NOTED) CH 1/2" REBAR WITH CAP FOUND 1/2" REBAR WITH CHAPARRAL CAP SET W OU E E T F T G WATER METER UTILITY POLE OVERHEAD UTILITIES ELEC. UTILITY ELEC. MANHOLE LIGHT POLE TELEPHONE UTILITY UNDERGROUND FIBER OPTIC MARKER TELEPHONE MANHOLE UNDERGROUND GAS MARKER CHAIN LINK FENCE NOTES : 1. PROTECTED TREES ARE DEFINED AS SINGLE TRUNK TREES WITH TRUNK DIAMETER OF 19 INCHES OR LARGER, OR MULTI-TRUNK TREES WITH A COMBINED TRUNK DIAMETER OF 19 INCHES OR LARGER. 2. HERITAGE TREES ARE DEFINED AS SINGLE TRUNK TREES WITH TRUNK DIAMETER OF 24 INCHES OR LARGER, OR MULTI-TRUNK TREES WITH A COMBINED TRUNK DIAMETER OF 24 INCHES OR LARGER. 3. SEE SHEET TL01 FOR TREE LIST. 4. OFFSITE TREES TO BE PROTECTED. 5. CONTOUR SOURCE: CITY OF AUSTIN LIDAR, 2' INTERVAL ZONING: LO-CO P O-N O-C G:W/ L NIN O Z P O-N O-C G: W/L NIN O Z I N A T N U O M Y K S T N E M P O L E V E D E T S R O F S N A L P I I 1 N A L P E T S L L A R E V O S A X E T , I N T S U A , 1 7 H S W 2 2 7 8 I S N O S V E R I E T A D Y B I I N O T P R C S E D . O N 1 2 0 2 / 4 2 / 2 : E T A D L L A R E V O - 1 0 4 0 - 9 3 4 A . G W D N A L P E T S I : E M A N G N W A R D I H B R K L J : Y B D E N G S E D I : Y B N W A R D H B R : Y B D E K C E H C NOT FOR CONSTRUCTION FOR REVIEW PURPOSES ONLY 6 8 3 1 - F - N R F 6 1 7 4 . 9 3 4 . 2 1 5 x a F 0 0 7 4 . 9 3 4 . 2 1 5 e n o h P . c n I , i g n i r e e n g n E A J L l d r a v e u o B o t l a R 0 0 5 7 i 0 0 1 e t i u S , I I g n d i l i u B 5 3 7 8 7 s a x e T , n i t s u A /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// /// LOCATION OF EXISTING UNDERGROUND AND OVERHEAD UTILITIES ARE APPROXIMATE LOCATIONS ONLY. THE CONTRACTOR SHALL DETERMINE THE EXACT LOCATION OF ALL EXISTING UTILITIES PRIOR TO BEGINNING WORK AND SHALL BE FULLY RESPONSIBLE FOR ANY AND ALL DAMAGES WHICH MIGHT OCCUR. JOB NUMBER: A439-0401 OSP01 R SHEET NO. 13 SHEETS SP-2021-0079C Know what's below. Call before you dig. OF K C A B T E S Y T L B T A P M O C I I I ' 0 5 K C A B T E S Y T L B T A P M O C I I I ' 5 2 2 0 P S O T E E H S E E S X X X X X X X X X X X X K C A B T E S R O R E T N I I ' 5 / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /// / / / / / / 2 of 46/// / / / /// /// T S E W 1 7 Y A W H G H I ) . . W O R . ' 0 5 1 ( / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / O F O F O F / / / O F O F O F / / / O F / / / O F / / / ZONING: AG-NP ROW DEDICATION AND FUTURE MOUNTAIN SHADOWS DRIVE IMPROVEMENTS BY OTHERS X X X X X X X X X X X X ZONING:AG-NP K C A B T E S ' 25' COMPATIBILITY SETBACK 9 4 0 9 4 1 5 2 50' COMPATIBILITY SETBACK 9 3 9 945 946 940 100' COMPATIBILITY SETBACK 9 4 0 941 945 25' BLDG SETBACK 25' BLDG SETBACK LOT 1, BLOCK A MOUNTAIN CREST SUBDIVISION ZONING: LR-MU-NP D D FDC SCR K C A B T E S Y T L B T A P M O C I I I ' 0 5 K C A B T E S Y T L B T A P M O C I I I ' 5 2 FDC SCR K C A B T E S Y T L B T A P M O C I I I ' 0 0 1 R C S C D F 10' REAR SETBACK /// / / / ZONING: GR-NP ZONING: GR-NP 1.25 - ACRES CUT / FILL AND CONSTRUCTION ON SLOPES REGULATED BY RCA (DOC. #2020164458) V C S W O D A H S N A T N U O M I / / / / / / / / / / / / / / / / / / / / / / / / / / / /// /// /// /// /// /// / / / /// / / / /// / / / / / / / / / / / / / / / / / / / / / F-1 G: M NIN O Z MOUNTAIN SHADOWS DR F-1 G: M NIN O Z F-1 G: M NIN O Z 5' INTERIOR SETBACK 25' COMPATIBILITY SETBACK 50' COMPATIBILITY SETBACK 100' COMPATIBILITY SETBACK C D F R C S ZONING: F-1 G: M NIN O Z P R-N G: R NIN O Z /// /// /// /// /// 1 0 P S O T E E H S E E S X X ZONING: MF-1 50 25 0 50 100 SCALE IN FEET LEGEND PROPOSED EXISTING 872 CONTOUR LINE ST WW WL RWL IR WW ST CONCRETE SIDEWALK PERVIOUS SIDEWALK SIDEWALK RAMP HANDICAPPED PARKING SPACE & SIDEWALK RAMP CROSSWALK STORM SEWER LINE WASTEWATER LINE WASTEWATER SERVICE WATER LINE WATER SERVICE CONDENSATE RECOVERY IRRIGATION LINE TREE TO REMAIN PROTECTED TREE TO REMAIN HERITAGE TREE TO REMAIN TREE TO BE REMOVED WATER VALVE FIRE HYDRANT WASTEWATER MANHOLE STORMSEWER MANHOLE CURB INLET GRATE INLET 1/2" REBAR FOUND (OR AS NOTED) CH 1/2" REBAR WITH CAP FOUND 1/2" REBAR WITH CHAPARRAL CAP SET W OU E E T F T G WATER METER UTILITY POLE OVERHEAD UTILITIES ELEC. UTILITY ELEC. MANHOLE LIGHT POLE TELEPHONE UTILITY UNDERGROUND FIBER OPTIC MARKER TELEPHONE MANHOLE UNDERGROUND GAS MARKER CHAIN LINK FENCE NOTES : 1. PROTECTED TREES ARE DEFINED AS SINGLE TRUNK TREES WITH TRUNK DIAMETER OF 19 INCHES OR LARGER, OR MULTI-TRUNK TREES WITH A COMBINED TRUNK DIAMETER OF 19 INCHES OR LARGER. 2. HERITAGE TREES ARE DEFINED AS SINGLE TRUNK TREES WITH TRUNK DIAMETER OF 24 INCHES OR LARGER, OR MULTI-TRUNK TREES WITH A COMBINED TRUNK DIAMETER OF 24 INCHES OR LARGER. 3. SEE SHEET TL01 FOR TREE LIST. 4. OFFSITE TREES TO BE PROTECTED. 5. CONTOUR SOURCE: CITY OF AUSTIN LIDAR, 2' INTERVAL I N A T N U O M Y K S T N E M P O L E V E D E T S R O F S N A L P I I 2 N A L P E T S L L A R E V O S A X E T , I N T S U A , 1 7 H S W 2 2 7 8 I S N O S V E R I E T A D Y B I I N O T P R C S E D . O N 1 2 0 2 / 4 2 / 2 : E T A D L L A R E V O - 1 0 4 0 - 9 3 4 A . G W D N A L P E T S I : E M A N G N W A R D I H B R K L J : Y B D E N G S E D I : Y B N W A R D H B R : Y B D E K C E H C NOT FOR CONSTRUCTION FOR REVIEW PURPOSES ONLY 6 8 3 1 - F - N R F 6 1 7 4 . 9 3 4 . 2 1 5 x a F 0 0 7 4 . 9 3 4 . 2 1 5 e n o h P . c n I , i g n i r e e n g n E A J L l d r a v e u o B o t l a R 0 0 5 7 i 0 0 1 e t i u S , I I g n d i l i u B 5 3 7 8 7 s a x e T , n i t s u A LOCATION OF EXISTING UNDERGROUND AND OVERHEAD UTILITIES ARE APPROXIMATE LOCATIONS ONLY. THE CONTRACTOR SHALL DETERMINE THE EXACT LOCATION OF ALL EXISTING UTILITIES PRIOR TO BEGINNING WORK AND SHALL BE FULLY RESPONSIBLE FOR ANY AND ALL DAMAGES WHICH MIGHT OCCUR. JOB NUMBER: A439-0401 OSP02 R SHEET NO. 23 SHEETS SP-2021-0079C Know what's below. Call before you dig. OF 3 of 46I N A T N U O M Y K S T N E M P O L E V E D E T S R O F S N A L P I T S I L E E R T S A X E T , I N T S U A , 1 7 H S W 2 2 7 8 I S N O S V E R I E T A D Y B I I N O T P R C S E D . O N 1 2 0 2 / 4 2 / 2 : E T A D L L A R E V O - 1 0 4 0 - 9 3 4 A . G W D N A L P E T S I : E M A N G N W A R D I H B R K L J : Y B D E N G S E D I : Y B N W A R D H B R : Y B D E K C E H C NOT FOR CONSTRUCTION FOR REVIEW PURPOSES ONLY 6 8 3 1 - F - N R F 6 1 7 4 . 9 3 4 . 2 1 5 x a F 0 0 7 4 . 9 3 4 . 2 1 5 e n o h P . c n I , i g n i r e e n g n E A J L l d r a v e u o B o t l a R 0 0 5 7 i 0 0 1 e t i u S , I I g n d i l i u B 5 3 7 8 7 s a x e T , n i t s u A LOCATION OF EXISTING UNDERGROUND AND OVERHEAD UTILITIES ARE APPROXIMATE LOCATIONS ONLY. THE CONTRACTOR SHALL DETERMINE THE EXACT LOCATION OF ALL EXISTING UTILITIES PRIOR TO BEGINNING WORK AND SHALL BE FULLY RESPONSIBLE FOR ANY AND ALL DAMAGES WHICH MIGHT OCCUR. JOB NUMBER: A439-0401 TL01 R SHEET NO. Know what's below. Call before you dig. OF 33 SHEETS SP-2021-0079C 4 of 46 September 2, 2020 Braxton Adamson Development Manager - Texas 500 N. Akard St. Suite 3400 Dallas, Texas 75201 Subject: Dear Mr. Adamson, Environmental Resource Inventory 21.25±acre Tract of Land, 8732 State Highway 71 (SH 71), Austin, Travis County, Texas InControl Technologies was retained by Lennar Multi-Family Communities, LLC to conduct an Environmental Resource Inventory and Threatened and Endangered Species analysis for an undeveloped tract of land located at 8732 State Highway 71 (SH 71) in the City of Austin, Travis County, Texas. The subject property is located between SH 71 to the south and Mountain Crest Drive to the north, on the east side of Mountain Shadows Drive. InControl Technologies completed the City of Austin Environmental Resource Inventory (Attachment A) as part of this assessment. This letter summarizes the major findings from our assessment. The 21.25±acre subject property consists of three (3) tracts that are primarily undeveloped wooded land. Sky Mountain Drive separates the property into northern and southern sections. The southern 4.53±acre tract fronts SH 71. The central 6.44±acre tract is located on the south side of Sky Mountain Drive. The northern 10.28±acre tract is located north of Sky Mountain Drive, east of Mountain Shadows Drive and south of Mountain Crest Drive. Portions of the property can be accessed by dirt roads. City water and sewer connections are currently available to the subject property but some of the structures on the property pre- date the installation of these utilities. The remains of a metal sided shed were noted on the southern tract. The concrete foundation of a mobile home and several sheds including a well house and a chicken coop, all of which are in various stages of disrepair, are located on the southern portion of the central tract. A one-story stone/wood residence is located on the north side of the northern tract with an entrance off Mountain Crest Drive. The interior of the building was not inspected as part of this assessment. The subject property is located in the Edwards Aquifer Contributing Zone which is the area or watershed where runoff from precipitation flows to the recharge zone of the Edwards Aquifer. A contributing zone plan that outlines best management practices to be implemented to protect water quality is required for any regulated activity over 5-acres proposed within the Edwards Aquifer Contributing Zone. The plan is 14731 Pebble Bend, Houston, Texas 77068 * (281) 580-8892 * FAX (281) 580-8853 5 of 46Braxton Adamson, Lennar Multi-Family Communities Environmental Resource Inventory September 2, 2020 Page 2 submitted to the Texas Commission on Environmental Quality (TCEQ) for their review and approval. Information regarding which activities are regulated is contained in 30 TAC 213.21. The subject property is not located within a flood plain. The property slopes to the southwest and northeast from a topographic high near the center of the property. There was no evidence of springs, seeps, point recharge features, bluffs, canyon rimrocks or wetlands on the property. One limestone outcrop feature was identified in the northern portion of the property north of the riverine feature. The limestone feature was characterized by three sides measuring approximately 50 feet in length trending northeast to southwest, 20-feet in width northwest to southeast with a depth of approximately 7-feet at its deepest point. Based on our review of historical aerial photography, the surface expression of the limestone outcrop was not present in historical aerial photographs prior to 1997. The 1997 aerial photograph indicates the present of a small above ground storage tank in the area of the limestone outcrop. A building is evident in the aerial, but no surface expression for this feature. Disturbed soils within the aera of the outcrop are noted in the 2002 aerial. The outcrop appears to be surrounded by bermed soil acting to retain the ponded water. It was concluded that the limestone surface expression was a manmade feature in the surface topography of the site. No water was present in the feature at the time of inspection. There was no evidence of a seep or spring emanating from this feature. The ground within the feature is loose dry soil. There was no evidence of wetland vegetation or hydric soil. Therefore, InControl Technologies concluded that the limestone outcrop was not a Critical Environmental Feature. The northern portion of the subject property is heavily vegetated with an abundance of Ash Juniper. This portion of the property is mapped within the Balcones Canyonlands Conservation Plan (BCCP) Unconfirmed Habitat Zone 2 for the Golden Cheek Warbler. At the time of this site assessment, the Golden Cheek Warbler had migrated south following the mating season ending in June. Therefore, no Golden Cheek Warblers were observed on the property. In addition, no nests were observed on the property. Before any development occurs on this property, A more comprehensive Golden Cheek Warbler assessment should be conducted. While no threatened and endangered species habitats or biologic resource buffers as defined by USACE and USFWS were identified on the subject property, portions of tracts 101503, 101502, 101505, 101501, and a small portion of 101512 fall within the Balcones Canyonlands Conservation Plan (BCCP) Unconfirmed Habitat Zone 2 (fee zone) for the Golden-Cheeked Warbler. The fees cost $2,750 per acre of land. We have estimated that the area of the Sky Mountain Development in this Zone is approximately 10 acres. A BCCP Permit Application is required and can be obtained from the BCCP website. We can help you complete this form if you decide to move forward with this project. There is no fee to apply for a BCCP permit. Habitat determinations are provided within three weeks of the receipt of a completed application. Neither submitting a BCCP permit application nor receiving a habitat determination letter from the County obligates an applicant to obtain a BCCP permit. Landowners always have the option to consult with the U.S. Fish & Wildlife Service (USFWS) to address mitigation concerns. Applicants who choose to obtain a BCCP permit will be required to sign a contract. The BCCP permit and contract, entered into between the applicant and the BCCP Coordinating Committee, will be recorded in Travis County's real property records. BCCP permits and contracts run in perpetuity with the land, similar to an easement. After the participation contract is signed and a BCCP permit (sometimes referred to as InControl Technologies 6 of 46Braxton Adamson, Lennar Multi-Family Communities Environmental Resource Inventory September 2, 2020 Page 3 BCCP Participation Certificate) is issued, the permittee is free to begin clearing for construction. However, clearing is subject to the terms and conditions of the contract and may be limited from March 1 through August 31 on properties containing golden-cheeked warbler habitat. While not expected on the subject property, if construction activities uncover new caves or significant karst features, such work must cease and the local USFWS Ecological Services office should be notified to check the cave for endangered species. Landowners may get assistance from karst geological or biological consultants to assist in expediting USFWS clearance for construction to resume. The BCCP permit must be posted at the construction site from the time clearing begins until construction is completed. The full Environmental Resource Inventory is included as Attachment A. It is our opinion that limestone feature is a historical artifact likely enhanced to collect rainwater. The feature no longer has the capability to hold water. In addition, the feature has no evidence of recent water from either seeps or springs. InControl Technologies does not consider this feature to be a significant environmental resource for the subject property. As always, if you have any comments or questions regarding the information contained within this document, please do not hesitate to call us at (281) 580-8892. Sincerely, InControl Technologies, Inc. Michael F. Marcon, PG, CAPM Vice President InControl Technologies 7 of 46Braxton Adamson, Lennar Multi-Family Communities Environmental Resource Inventory September 2, 2020 Attachments Attachment A Environmental Resource Inventory Sky Mountain Development, Austin, Texas Updated 02/2020 InControl Technologies 8 of 46PRELIMINARY DRAFT PENDING SITE DEVELOPMENT PLANS Environmental Resource Inventory For the City of Austin Related to LDC 25-8-121, City Code 30-5-121, ECM 1.3.0 & 1.10.0 Case No.: (City use only) The ERI is required for projects that meet one or more of the criteria listed in LDC 25-8-121(A), City Code 30-5-121(A). 1. SITE/PROJECT NAME: Sky Mountain Development 2. COUNTY APPRAISAL DISTRICT PROPERTY ID (#’s): 101501, 101502, 101503, 101505, 101510, 101512, 304775, 304776 3. ADDRESS/LOCATION OF PROJECT: Sky Mountain Drive 4. WATERSHED: Williamson Creek (Barton Springs Zone) 5. THIS SITE IS WITHIN THE (Check all that apply) Edwards Aquifer Recharge Zone* (See note below) .................. (cid:133)YES (cid:133)No Edwards Aquifer Contributing Zone*.................................. (cid:133)YES (cid:133)No Edwards Aquifer 1500 ft Verification Zone* ....................... (cid:133)YES (cid:133)No Barton Spring Zone* .......................................................... (cid:133)YES (cid:133)No *(as defined by the City of Austin – LDC 25-8-2 or City Code 30-5-2) ✔ ✔ ✔ ✔ Note: If the property is over the Edwards Aquifer Recharge zone, the Hydrogeologic Report and karst surveys must be completed and signed by a Professional Geoscientist Licensed in the State of Texas. 6. DOES THIS PROJECT PROPOSE FLOODPLAIN MODIFICATION?.......(cid:133)YES** (cid:133)NO ✔ If yes, then check all that apply: Note: To be confirmed based on site development plans. (cid:13) (1) The floodplain modifications proposed are necessary to protect the public health and safety; (cid:13) (2) The floodplain modifications proposed would provide a significant, demonstrable environmental benefit, as determined by a functional assessment of floodplain health as prescribed by the Environmental Criteria Manual (ECM), or (cid:13) (3) The floodplain modifications proposed are necessary for development allowed in the critical water quality zone under LDC 25-8-261 or 25-8-262, City Code 30-5-261 or 30-5-262. (cid:13) (4) The floodplain modifications proposed are outside of the Critical Water Quality Zone in an area determined to be in poor or fair condition by a functional assessment of floodplain health. ** If yes, then a functional assessment must be completed and attached to the ERI (see ECM 1.7 and Appendix X for forms and guidance) unless conditions 1 or 3 above apply. 7. IF THE SITE IS WITHIN AN URBAN OR SUBURBAN WATERSHED, DOES THIS PROJECT PROPOSE A UTILITY LINE PARALLEL TO AND WITHIN THE CRITICAL WATER QUALITY ZONE? ......................................................... (cid:133)YES*** (cid:133)NO ✔ ***If yes, then riparian restoration is required by LDC 25-8-261(E) or City Code 30-5-261(E) and a functional assessment must be completed and attached to the ERI (see ECM1.5 and Appendix X for forms and guidance). 0 8. There is a total of (#’s) Critical Environmental Feature(s)(CEFs) on or within150 feet of the project site. If CEF(s) are present, attach a detailed DESCRIPTION of the CEF(s), color PHOTOGRAPHS, the CEF WORKSHEET and provide DESCRIPTIONS of the proposed CEF buffer(s) and/or wetland mitigation. Provide the number of each type of CEFs on or within 150 feet of the site (Please provide the number of CEFs ): 9 of 46 0 0 0 (#’s) Point Recharge Feature(s) (#’s) Spring(s)/Seep(s) 0 0 (#’s) Canyon Rimrock(s) (#’s) Wetland(s) (#’s) Bluff(s) Note: Standard buffers for CEFs are 150 feet, with a maximum of 300 feet for point recharge features. Except for wetlands, if the standard buffer is not provided, you must provide a written request for an administrative variance from LDC 25-8-281(C)(1) and provide written findings of fact to support your request. Request forms for administrative variances from requirements stated in LDC 25-8-281 are available from Watershed Protection Department. 9. The following site maps are attached at the end of this report (Check all that apply and provide): All ERI reports must include: (cid:13) Site Specific Geologic Map with 2-ft Topography X (cid:13) Historic Aerial Photo of the Site X (cid:13) Site Soil Map X (cid:13) Critical Environmental Features and Well Location Map on current X Aerial Photo with 2-ft Topography Only if present on site (Maps can be combined): (cid:13) Edwards Aquifer Recharge Zone with the 1500-ft Verification Zone(cid:3) (cid:3) (cid:3) (Only if site is over or within 1500 feet the recharge zone) (cid:13) Edwards Aquifer Contributing Zone(cid:3) X (cid:13) Water Quality Transition Zone (WQTZ) (cid:13) Critical Water Quality Zone (CWQZ)(cid:3) (cid:13) City of Austin Fully Developed Floodplains for all water courses with (cid:3) (cid:3) (cid:3) (cid:3) (cid:3) (cid:3) (cid:3) (cid:3) (cid:3) (cid:3) up to 64-acres of drainage 10. HYDROGEOLOGIC REPORT – Provide a description of site soils, topography, and site specific geology below (Attach additional sheets if needed): Surface Soils on the project site is summarized in the table below and uses the SCS Hydrologic Soil Groups*. If there is more than one soil unit on the project site, show each soil unit on the site soils map. Soil Series Unit Names, Infiltration Characteristics & Thickness *Soil Hydrologic Groups Definitions (Abbreviated) Soil Series Unit Name & Subgroup** Group* Thickness (feet) BlD - Brackett-Rock Outcrop VoD - Volente Silty Clay Loam D C 1.5 5 A. Soils having a high infiltration rate when thoroughly wetted. B. Soils having a moderate infiltration rate when thoroughly wetted. C. Soils having a slow infiltration rate when thoroughly wetted. D. Soils having a very slow infiltration rate when thoroughly wetted. **Subgroup Classification – See Classification of Soil Series Table in County Soil Survey. WPD ERM ERI-2014-01 Page 2 of 6 10 of 46Description of Site Topography and Drainage (Attach additional sheets if needed): The ground surface slopes to the southwest and to the northeast from the topographic high in the approximate center of the property. The elevation at the center of the property is approximately 1,000 feet (ft) above mean seal level (AMSL), 940 ft AMSL at the southwest property boundary, and 960 ft AMSL at the northeast boundary The northeastern portion of the property is bisected by a draw that runs northwest to southeast at elevations of 948 ft to 932 ft AMSL, respectively. Drainage on the subject property travels by sheetflow to a drainage culvert along Hwy 71 to the southwest or to the draw to the northeast, and eventually to Williamson Creek. The National Wetlands Inventory (NWI) Mapper identifies a riverine adjacent and parallel to the draw (USFWS, 2020). However, this area was dry at the time of the site assessment and no hydrophytic plant species or hydric soils were observed. The soils consist of Bracket-Rock Outcrop Complex (1.5 ft in thickness) and Volente Silty Clay Loam (5 ft in thickness), which are characterized by very slow and slow infiltration rates, respectively (USDA, 2020). List surface geologic units below: Group Trinity Group Geologic Units Exposed at Surface Formation Upper Glen Rose Limestone Member -- Brief description of site geology (Attach additional sheets if needed): The geology at the surface of the subject property consists of the Upper Glen Rose Limestone (Kgru) (USGS, 2020). Based on the Geologic Atlas of Texas (Austin Sheet), the Upper Glen Rose Limestone is located above and updip of the Edwards Formation; the subject property is separated from the Edwards Formation by one fault. The Upper Glen Rose Limestone is comprised of limestone, dolomite, and marl in alternating recessive beds that form a stair-step topography. The limestone (calcium carbonate) ranges from aphanitic (very fine-grained) and hard to softer marl (calcium carbonate-rich mudstone with variable amounts of clay and silt). The dolomite (calcium carbonate with a high percentage of magnesium) is also fine-grained. Rock outcropping of the Upper Glen Rose Limestone was observed on the subject property during the site assessment. The thickness of the Upper Glen Rose Limestone is approximately 220 feet. No sensitive geologic features, including springs, seeps, point recharge features, bluffs, canyon rimrocks or wetlands, were observed on the subject property during the site assessment. Further discussion of the site geology is provided in Attachment A. Wells – Identify all recorded and unrecorded wells on site (test holes, monitoring, water, oil, unplugged, capped and/or abandoned wells, etc.): There are (#) wells present on the project site and the locations are shown and labeled 1 0 1 0 0 (#’s)The wells are not in use and have been properly abandoned. (#’s)The wells are not in use and will be properly abandoned. (#’s)The wells are in use and comply with 16 TAC Chapter 76. There are (#’s) wells that are off-site and within 150 feet of this site. WPD ERM ERI-2014-01 Page 3 of 6 11 of 46 11. THE VEGETATION REPORT – Provide the information requested below: Brief description of site plant communities (Attach additional sheets if needed): The subject property is characterized by Edwards Plateau: Deciduous Oak/Evergreen Motte and Woodland, Ashe Juniper Motte and Woodland, and Ashe Juniper - Live Oak Shrubland (TPWD, 2020). The majority of the vegetation on the subject property are Ashe Juniper, Sugar Hackberry, and Cedar Elm. Due to the abundance of Ashe Juniper, the northwestern portion of the property is within the Balcones Canyonlands Conservation Plan (BCCP) Unconfirmed Habitat Zone 2 for the Golden- Cheeked Warbler. At the time of the site assessment, the Golden-Cheeked Warbler had migrated to south following the mating season ending in June and none were observed, including no nests. The property is not located in the USFWS Critical Habitat for Threatened & Endangered Species. There is woodland community on site …………………….(cid:133)YES (cid:133) NO (Check one). If yes, list the dominant species below: ■ Woodland species There is grassland/prairie/savanna on site……………..(cid:133)YES (cid:133) NO (Check one). If yes, list the dominant species below: ■ Grassland/prairie/savanna species Common Name Ashe Juniper Cedar Elm Japanese Privet Texas Oak Sugar Hackberry Common Name Bermudagrass Prickly Pear Johnson Grass Scientific Name Juniperus ashei Ulmus crassifolia Ligustrum japonicum Quercus buckleyi Celtis laevigata Scientific Name Cynodn dactylon Opuntia Sorghum halpense King Ranch Bluestem Bothriochloa ischaemum There is hydrophytic vegetation on site ………………..(cid:133)YES (cid:133) NO (Check one). If yes, list the dominant species in table below (next page): ■ WPD ERM ERI-2014-01 Page 4 of 6 12 of 46Hydrophytic plant species Common Name Scientific Name NA NA Wetland Indicator Status NA A tree survey of all trees with a diameter of at least eight inches measured four and one- half feet above natural grade level has been completed on the site. (cid:3) (cid:133)YES (cid:133) NO (Check one). X 12. WASTEWATER REPORT – Provide the information requested below. Wastewater for the site will be treated by (Check of that Apply): (cid:13) On-site system(s) (cid:13) City of Austin Centralized sewage collection system X (cid:13) Other Centralized collection system Note: To be confirmed based on site development plans. Note: All sites that receive water or wastewater service from the Austin Water Utility must comply with City Code Chapter 15-12 and wells must be registered with the City of Austin The site sewage collection system is designed and will be constructed to in accordance to all State, County and City standard specifications. (cid:3) (cid:133)YES (cid:133) NO (Check one). ■ Calculations of the size of the drainfield or wastewater irrigation area(s) are attached at the end of this report or shown on the site plan. (cid:133)YES (cid:133) NO (cid:133) Not Applicable (Check one). ■ Wastewater lines are proposed within the Critical Water Quality Zone? (cid:3) (cid:133)YES (cid:133) NO (Check one). If yes, then provide justification below: ■ NA WPD ERM ERI-2014-01 Page 5 of 6 13 of 46 Is the project site is over the Edwards Aquifer? (cid:133)YES (cid:133) NO (Check one). ■ If yes, then describe the wastewater disposal systems proposed for the site, its treatment level and effects on receiving watercourses or the Edwards Aquifer. NA 13. One (1) hard copy and one (1) electronic copy of the completed assessment have been provided. Date(s) ERI Field Assessment was performed: 29 August 2020 Date(s) My signature certifies that to the best of my knowledge, the responses on this form accurately reflect all information requested. Clint Weaver Print Name Clint Weaver Signature SQ Environmental, LLC Name of Company Digitally signed by Clint Weaver Date: 2020.09.03 09:26:08 -05'00' 8067739326 Telephone c.weaver@sqenv.com Email Address 9/3/2020 Date For project sites within the Edwards Aquifer Recharge Zone, my signature and seal also certifies that I am a licensed Professional Geoscientist in the State of Texas as defined by ECM 1.12.3(A). P.G. Seal WPD ERM ERI-2014-01 Page 6 of 6 14 of 46City of Austin Environmental Resource Inventory - Critical Environmental Feature Worksheet Project Name: Sky Mountain Development Project Address: Sky Mountain Dr, Austin, TX 78735 Site Visit Date: 29 August 2020 Environmental Resource Inventory Date: 3 September 2020 1 2 3 4 9 FEATURE TYPE {Wetland,Rimrock, Bluffs,Recharge Feature,Spring} FEATURE ID (eg S-1) FEATURE LONGITUDE (WGS 1984 in Meters) FEATURE LATITUDE (WGS 1984 in Meters) WETLAND DIMENSIONS (ft) RIMROCK/BLUFF DIMENSIONS (ft) coordinate notation coordinate notation Length Avg Height RECHARGE FEATURE DIMENSIONS Y Z Trend X Springs Est. Discharge cfs None -- -- -- -- -- -- -- -- -- -- -- X -- Y -- Primary Contact Name: Clint Weaver Phone Number: 806-773-9326 Prepared By: Clint Weaver Email Address: c.weaver@sqenv.com 5 6 7 8 -- City of Austin Use Only CASE NUMBER: For rimrock, locate the midpoint of the segment that describes the feature. For wetlands, locate the approximate centroid of the feature and the estimated area. For a spring or seep, locate the source of groundwater that feeds a pool or stream. DMS DD YES NO Wetland Rimrock Recharge Feature Spring Seep Please state the method of coordinate data collection and the approximate precision and accuracy of the points and the unit of measurement. Method Accuracy GPS Surveyed Other sub-meter (cid:3508) (cid:3508) (cid:3508) Professional Geologists apply seal below (cid:3508) (cid:3508) (cid:3508) > 1 meter meter 9/3/2020 WPD ERM ERI-CEF-01 Page 1 of 1 15 of 46101505 15 14 13 101503 101502 101501 12 8 11 101512 101510 10 9 304775 2 1 3 5 2 7 6 304776 4 N LEGEND SUBJECT PROPERTY BOUNDARIES, APPROXIMATE WATER WELL IN WELLHOUSE (WITH ELECTRICAL POLE & LINE) TCAD PARCEL No. 101501 1. ELECTRICAL CONNECTION (SUBGRADE) 2. DEBRIS (LARGE CONCRETE COUPLINGS, PVC LINES, ETC.) 3. DUMPED WET ASPHALT (HARDENED) 4. ELECTRICAL & WATER CONNECTIONS (SUBGRADE) 5. DEBRIS (FORMER MOBILE HOME TRAILER LOCATION) 6. SHED, ELECTRICAL POLE & LINE, CONCRETE FOUNDATION 7. FORMER CHICKEN COOPS, DEBRIS (PVC IRRIGATION LINES) 8. FORMER DWELLING 9. DEBRIS (PARTIALLY FULL DRUMS, ETC.) 10. ABANDONED DUMP TRUCK IMAGERY SOURCE: GOOGLE EARTH, 11/22/2019 11. ABANDONED GOOSE-NECK TRAILER 12. ABANDONED VAN, EARTHEN ROADBLOCK 13. STORMWATER DRAINAGE CONVEYANCE (DRY) 14. AREA OF POTENTIAL LIMESTONE FEATURE 15. CURRENT RESIDENCE FIGURE 1 PROPERTY LAYOUT MAP 0 150 300 SQ Environmental, LLC SKY MOUNTAIN DEVELOPMENT AUSTIN, TEXAS 78735 SCALE IN FEET SCALE: DATE: 1 IN = 300 FT SEPT 2020 PN: 1131.003.001 16 of 46BlD VoD BlD BlD VoD LEGEND IMAGERY SOURCE: USDA SOIL SURVEY MAPPER SUBJECT PROPERTY BOUNDARIES, APPROXIMATE SOIL BOUNDARY BlD - BRACKETT-ROCK OUTCROP COMPLEX, CLAY LOAM, 1-12% SLOPES, VERY SLOW INFILTRATION RATE, UP TO 18 INCHES THICK VoD - VOLENTE SILTY CLAY LOAM, 1-8% SLOPES, SLOW INFILTRATION RATE, UP TO 59 INCHES THICK QU - QUARRY PIT N FIGURE 2 SITE SOIL MAP 0 250 500 SQ Environmental, LLC SKY MOUNTAIN DEVELOPMENT AUSTIN, TEXAS 78735 SCALE IN FEET SCALE: DATE: 1 IN = 500 FT SEPT 2020 PN: 1131.003.001 17 of 46POTENTIAL LIMESTONE FEATURE STEEP GRADIENT (<60°) LEGEND IMAGERY SOURCE: COA PROPERTY PROFILE MAPPER SUBJECT PROPERTY BOUNDARIES, APPROXIMATE WATER WELL CREEK CENTERLINE 2-FT TOPOGRAPHIC CONTOUR CRITICAL WATER QUALITY ZONE (CWQZ) CRITICAL ENVIRONMENTAL FEATURE (CEF) SETBACK N SPRING FIGURE 3 CRITICAL ENVIRONMENTAL FEATURES & WATER WELL MAP SKY MOUNTAIN DEVELOPMENT AUSTIN, TEXAS 78735 WETLAND; RIVERINE, USFWS NATIONAL WETLAND INVENTORY (NOT OBSERVED) STORMWATER FLOW DIRECTION NOTE: SUBJECT PROPERTY IS LOCATED WHOLLY WITHIN EDWARDS AQUIFER CONTRIBUTING ZONE AND THE BARTON SPRINGS ZONE WATERSHED. 0 175 350 SQ Environmental, LLC SCALE IN FEET SCALE: DATE: 1 IN = 350 FT SEPT 2020 PN: 1131.003.001 18 of 46Kgru Qal LEGEND SUBJECT PROPERTY BOUNDARIES, APPROXIMATE IMAGERY SOURCE: USGS TX GEOLOGY VIEWER Kgru - UPPER GLEN ROSE LIMESTONE, APPROXIMATELY 220 FT THICK Qal - ALLUVIUM; FLOODPLAIN DEPOSITS, CLAY, SILT, SAND, GRAVEL N FIGURE 4 GEOLOGIC MAP 0 700 1,400 SQ Environmental, LLC SKY MOUNTAIN DEVELOPMENT AUSTIN, TEXAS 78735 NOTE: SUBJECT PROPERTY IS LOCATED WHOLLY WITHIN EDWARDS AQUIFER CONTRIBUTING ZONE. SCALE IN FEET SCALE: DATE: 1 IN = 1,400 FT SEPT 2020 PN: 1131.003.001 19 of 46LEGEND SUBJECT PROPERTY BOUNDARIES, APPROXIMATE URBAN LOW INTENSITY EDWARDS PLATEAU: DECIDUOUS OAK / EVERGREEN MOTTE AND WOODLAND N EDWARDS PLATEAU: ASHE JUNIPER - LIVE OAK SHRUBLAND EDWARDS PLATEAU: ASHE JUNIPER MOTTE AND WOODLAND EDWARDS PLATEAU: SAVANNA GRASSLAND IMAGERY SOURCE: TPWD ECOSYSTEM MAPPER FIGURE 5 VEGETATION MAP 0 250 500 SQ Environmental, LLC SKY MOUNTAIN DEVELOPMENT AUSTIN, TEXAS 78735 SCALE IN FEET SCALE: DATE: 1 IN = 500 FT SEPT 2020 PN: 1131.003.001 20 of 46POTENTIAL LIMESTONE FEATURE NOT PRESENT LEGEND SUBJECT PROPERTY BOUNDARIES, APPROXIMATE IMAGERY SOURCE: USDA, FLIGHT DATE: 1/18/1973 N FIGURE 6 1973 HISTORICAL AERIAL PHOTOGRAPH SKY MOUNTAIN DEVELOPMENT AUSTIN, TEXAS 78735 0 300 600 SQ Environmental, LLC SCALE IN FEET SCALE: DATE: 1 IN = 600 FT SEPT 2020 PN: 1131.003.001 21 of 46LEGEND IMAGERY SOURCE: BCCP PERMIT & HABITAT ZONES MAPPER SUBJECT PROPERTY BOUNDARIES, APPROXIMATE NOT KNOWN TO BE HABITAT ZONE 3 (NO FEE ZONE) UNCONFIRMED HABITAT ZONE 2 (FEE ZONE); GOLDEN-CHEEKED WARBLER HABITAT N BCCP & USFWS 10A PERMITS (MITIGATED PROJECTS) FIGURE 7 BALCONES CANYONLANDS CONSERVATION PLAN HABITAT ZONE MAP SKY MOUNTAIN DEVELOPMENT AUSTIN, TEXAS 78735 0 350 700 SQ Environmental, LLC SCALE IN FEET SCALE: DATE: 1 IN = 700 FT SEPT 2020 PN: 1131.003.001 22 of 46ENVIRONMENTAL RESOURCE INVENTORY SKY MOUNTAIN DEVELOPMENT, AUSTIN, TEXAS ATTACHMENT A SITE GEOLOGY (CONTINUED) As discussed, no sensitive geologic features, including springs, seeps, point recharge features, bluffs, canyon rimrocks or wetlands, nor any faults, caves, streams, fractures, solution zones, vugs, or cavities were observed on the property during the site assessment. Although a steep gradient is present in the central portion of the property, adjacent south of Sky Mountain Dr, the gradient is less than 60 degrees and is not classified as a canyon rimrock. A potential limestone feature at ground surface was observed in the northern portion of the property at the residential parcel located at 8703 Mountain Crest Dr. The potential limestone feature was characterized by three sides measuring approximately 50 ft in length trending northeast to southwest and 20 ft in width northwest to southeast, with a depth of approximately 7 ft at the lowest point. The floor of the feature contains loose soil, and the sidewalls are fractured or stacked limestone (not massive limestone). No water was present at the time of the site assessment, and the area appeared to have been dry for a long period of time. The sidewall on the southwestern portion appeared to be naturally eroded and was not present; a wooden deck/boardwalk was located on the southeast side. Additionally, no fractures or solution zones were observed in or near the potential feature. The potential limestone feature is not present in the historical aerial photograph dated 18 January 1973. In an aerial photograph dated 1997, the low area/potential feature does not appear to be present and there is a small, aboveground, artificial container of water in the area of where the feature would be located. See attached historical aerial photographs. Based on these aerials, as early as 2003 the feature is present and contains water. Narrow drainage culverts appear to have been created in the adjacent limestone to the northwest, originating from the upgradient area of the house to the southwest toward the draw; a shorter culvert originates from the feature and intersects the aforementioned culvert. From 2003 to mid-2017, the low area intermittently contained water. Prior to 2017, the southwestern sidewall appears to no longer be present, and the area does not contain water. This potential limestone feature may be a sinkhole that historically ponded water runoff, or a former seep (based on the presence of water in historical aerials). As discussed above, the southwestern sidewall is no longer present and therefore the feature does not hold water (although the area appears to be dry and no evidence of a current or recent seep or spring were observed). No hydrophytic vegetation or hydric soils were observed at the time of the site assessment, which would be an indicator of a seep. The potential limestone feature is not considered a Critical Environmental Feature (CEF) due to its presence only recently in geologic terms, the lack of water, the lack of hydrophytic vegetation and hydric soils, and probability of man-induced creation or alteration. 9/3/2020 __________________________ Clint Weaver, P.G. 23 of 46HISTORICAL AERIAL PHOTOGRAPHS 24 of 46Legend Addresses TCAD Parcels Planimetrics 2015 Contours Year- 2017 2 Ft Contours 10 Ft Contours Creek Buffers/Waterway Setbacks Critical Water Quality Zone Water Quality Transition Zone Spring Wetland Rimrock/Bluff Creek Centerlines Lakes 0.0 0 0.01 0.0 Miles NAD_1983_StatePlane_Texas_Central_FIPS_4203_Feet Date Printed: 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. This product has been produced by the City of Austin for the sole purpose of geographic reference. No warranty is made by the City of Austin regarding specific accuracy or completeness. 1: 600 Notes 25 of 4626 of 46Legend Addresses TCAD Parcels Planimetrics 2015 Contours Year- 2017 2 Ft Contours 10 Ft Contours Creek Centerlines Lakes 0.0 0 0.01 0.0 Miles NAD_1983_StatePlane_Texas_Central_FIPS_4203_Feet Date Printed: 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. This product has been produced by the City of Austin for the sole purpose of geographic reference. No warranty is made by the City of Austin regarding specific accuracy or completeness. 1: 600 Notes 27 of 4628 of 46Legend Addresses TCAD Parcels Planimetrics 2015 Contours Year- 2017 2 Ft Contours 10 Ft Contours Creek Centerlines Lakes 0.0 0 0.01 0.0 Miles NAD_1983_StatePlane_Texas_Central_FIPS_4203_Feet Date Printed: 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. This product has been produced by the City of Austin for the sole purpose of geographic reference. No warranty is made by the City of Austin regarding specific accuracy or completeness. 1: 600 Notes 29 of 4630 of 46Legend Addresses TCAD Parcels Planimetrics 2015 Contours Year- 2017 2 Ft Contours 10 Ft Contours Creek Centerlines Lakes 0.0 0 0.01 0.0 Miles NAD_1983_StatePlane_Texas_Central_FIPS_4203_Feet Date Printed: 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. This product has been produced by the City of Austin for the sole purpose of geographic reference. No warranty is made by the City of Austin regarding specific accuracy or completeness. 1: 600 Notes 31 of 46Legend Addresses TCAD Parcels Planimetrics 2015 Contours Year- 2017 2 Ft Contours 10 Ft Contours Creek Centerlines Lakes 0.0 0 0.01 0.0 Miles NAD_1983_StatePlane_Texas_Central_FIPS_4203_Feet Date Printed: 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. This product has been produced by the City of Austin for the sole purpose of geographic reference. No warranty is made by the City of Austin regarding specific accuracy or completeness. 1: 600 Notes 32 of 4633 of 4634 of 4635 of 46Legend Addresses TCAD Parcels Planimetrics 2015 Contours Year- 2017 2 Ft Contours 10 Ft Contours Creek Centerlines Lakes 0.0 0 0.01 0.0 Miles NAD_1983_StatePlane_Texas_Central_FIPS_4203_Feet Date Printed: 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. This product has been produced by the City of Austin for the sole purpose of geographic reference. No warranty is made by the City of Austin regarding specific accuracy or completeness. 1: 600 Notes 36 of 4637 of 4638 of 46Legend Addresses TCAD Parcels Planimetrics 2015 Contours Year- 2017 2 Ft Contours 10 Ft Contours Creek Centerlines Lakes 0.0 0 0.01 0.0 Miles NAD_1983_StatePlane_Texas_Central_FIPS_4203_Feet Date Printed: 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. This product has been produced by the City of Austin for the sole purpose of geographic reference. No warranty is made by the City of Austin regarding specific accuracy or completeness. 1: 600 Notes 39 of 4640 of 46Legend Addresses TCAD Parcels Planimetrics 2015 Contours Year- 2017 2 Ft Contours 10 Ft Contours Creek Centerlines Lakes 0.0 0 0.01 0.0 Miles NAD_1983_StatePlane_Texas_Central_FIPS_4203_Feet Date Printed: 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. This product has been produced by the City of Austin for the sole purpose of geographic reference. No warranty is made by the City of Austin regarding specific accuracy or completeness. 1: 600 Notes 41 of 4642 of 46Legend Addresses TCAD Parcels Planimetrics 2015 Contours Year- 2017 2 Ft Contours 10 Ft Contours Creek Centerlines Lakes 0.0 0 0.01 0.0 Miles NAD_1983_StatePlane_Texas_Central_FIPS_4203_Feet Date Printed: 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. This product has been produced by the City of Austin for the sole purpose of geographic reference. No warranty is made by the City of Austin regarding specific accuracy or completeness. 1: 600 Notes 43 of 4644 of 4645 of 4646 of 46