20211020-003a: COA Fire & EMS Station - Davenport Village, SP-2021-0121D variance packet — original pdf

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ITEM FOR ENVIRONMENTAL COMMISSION AGENDA COMMISSION MEETING DATE: October 20, 2021 NAME & NUMBER OF PROJECT: COA Fire & EMS Station - Davenport Village SP-2021-0121D NAME OF APPLICANT OR ORGANIZATION: Anna Merryman, Garza EMC LLC LOCATION: 4601 Westlake Dr., Austin, TX, 78746 COUNCIL DISTRICT: Council District does not apply in Extraterritorial Jurisdiction ENVIRONMENTAL REVIEW STAFF: Pamela Abee-Taulli, Environmental Program Coordinator, Development Services Department, 512.974.1879, pamela.abee- taulli@austintexas.gov. WATERSHED: REQUEST: St. Stephens Creek Watershed, Water Supply Rural Classification, Drinking Water Protection Zone Variance request is as follows: Vary 25-8-302(A)(2) to allow construction of a parking area on a slope with a gradient of more than 15 percent. STAFF RECOMMENDATION: Staff recommends this variance, having determined the findings of fact to have been met. STAFF CONDITION: Applicant will provide landscape plan, including mitigation for removed trees, to provide enhanced soil stabilization and water quality for the site. Page 1 of 8 Development Services Department Staff Recommendations Concerning Required Findings Project Name: Ordinance Standard: Watershed Protection Ordinance Variance Request: COA Fire & EMS Station - Davenport Village Vary 25-8-302(A)(2) to allow construction of a parking area on a slope with a gradient of more than 15 percent. Include an explanation with each applicable finding of fact. A. Land Use Commission variance determinations from Chapter 25-8-41 of the City Code: 1. The surrounding area does not have adequate access to emergency 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 facilities. This development will provide fire and EMS access that the community currently lacks. In similar situations, where development is deemed appropriate for the location but is constrained by the natural condition of the site (slopes exceeding 15 percent) as well as requirements related to the type of development (emergency vehicle accommodation), applications that have minimized the placement of development on slopes have been granted similar variances. 2. The variance: a) 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 This variance is for building a surface parking lot to be constructed on an area with slopes greater than 15 percent. The parking lot is minimally sized to accommodate the number of employees that will be at this station. Alternative layouts were considered. However, design is constrained by the maximum allowable slope of 15 percent for the emergency vehicles to access Westlake Dr. Page 2 of 8Siting the project on a hilly lot is unavoidable, since the proposed location in this hill-country area of town was determined by the service need for a fire and EMS station in this vicinity. b) c) Is the minimum deviation from the code requirement necessary to allow a reasonable use of the property; Yes The proposed improvements are aligned on the property to cause the least amount of disturbance to the existing site and to have minimum deviation from the code requirement. Does not create a significant probability of harmful environmental consequences. Yes The cut will be stabilized with a retaining wall. Erosion and sedimentation controls will be code compliant and appropriate for construction on slopes. 3. Development with the variance will result in water quality that is at least equal to the water quality achievable without the variance. Yes The project is compliant with water quality requirements. B. The Land Use Commission may grant a variance from a requirement of Section 25-8-422 (Water Supply Suburban Water Quality Transition Zone), Section 25-8-452 (Water Supply Rural Water Quality Transition Zone), Section 25-8-482 (Barton Springs Zone Water Quality Transition Zone), Section 25-8-368 (Restrictions on Development Impacting Lake Austin, Lady Bird Lake, and Lake Walter E. Long), or Article 7, Division 1 ( Critical Water Quality Zone Restrictions ), after determining that:: 1. 2. 3. The criteria for granting a variance in Subsection (A) are met; NA The requirement for which a variance is requested prevents a reasonable, economic use of the entire property; NA The variance is the minimum deviation from the code requirement necessary to allow a reasonable, economic use of the entire property. NA Staff Determination: Staff determines that the findings of fact have been met. Staff recommends the following condition: Applicant will provide landscape plan, including mitigation for removed trees, to provide enhanced soil stabilization and water quality for the site. Environmental Reviewer (DSD) ________________ (Pamela Abee-Taulli) Environmental Review Manager (DSD) _________________ (Mike McDougal) Date 10/6/2021 Date: 10/6/2021 Page 3 of 8Deputy Environmental Officer (WPD) _________________ (Liz Johnston) Date: 10/06/2021 Page 4 of 8ITEM FOR ENVIRONMENTAL COMMISSION AGENDA COMMISSION MEETING DATE: October 20, 2021 NAME & NUMBER OF PROJECT: COA Fire & EMS Station - Davenport Village SP-2021-0121D NAME OF APPLICANT OR ORGANIZATION: Anna Merryman, Garza EMC LLC LOCATION: 4601 Westlake Dr., Austin, TX, 78746 COUNCIL DISTRICT: Council District does not apply in Extraterritorial Jurisdiction ENVIRONMENTAL REVIEW STAFF: WATERSHED: REQUEST: Pamela Abee-Taulli, Environmental Program Coordinator, Development Services Department, 512.974.1879, pamela.abee- taulli@austintexas.gov. St. Stephens Creek Watershed, Water Supply Rural Classification, Drinking Water Protection Zone Variance request is as follows: Vary 25-8-341 to allow cut over four feet to 17 feet. STAFF RECOMMENDATION: Staff recommends this variance, having determined the findings of fact to have been met. STAFF CONDITION: Applicant will provide landscape plan, including mitigation for removed trees, to provide enhanced soil stabilization and water quality for the site. Page 5 of 8Development Services Department Staff Recommendations Concerning Required Findings Project Name: Ordinance Standard: Watershed Protection Ordinance Variance Request: COA Fire & EMS Station - Davenport Village Vary 25-8-341 to allow cut over four feet to 17 feet. Include an explanation with each applicable finding of fact. 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 available to owners of similarly situated property with approximately contemporaneous development subject to similar code requirements. The surrounding area does not have adequate access to emergency Yes facilities. This development will provide fire and EMS access that the community currently lacks. In similar situations, where development is deemed appropriate for the location but is constrained by the natural condition of the site (slopes exceeding 35 percent) as well as requirements related to the type of development (emergency vehicle accommodation), applications that have minimized the extent of grading 2. The variance: a) 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 This variance is to cut over 4 feet for the pond and for placement of the building and drive. Alternative layouts were considered. However, design is constrained by the maximum allowable slope of 15 percent for the emergency vehicles to access Westlake Dr. Moreover, siting the project on a hilly lot is unavoidable, since the proposed location in this hill-country area of town was Page 6 of 8determined by the service need for a fire and EMS station in this vicinity. b) c) Is the minimum deviation from the code requirement necessary to allow a reasonable use of the property; Yes The proposed improvements are aligned on the property to cause the least amount of disturbance to the existing site and to have minimum deviation from the code requirement. Does not create a significant probability of harmful environmental consequences. Yes The cut will be stabilized with a retaining wall. Erosion and sedimentation controls will be code compliant and appropriate for construction on slopes. 3. Development with the variance will result in water quality that is at least equal to the water quality achievable without the variance. Yes The project is compliant with water quality requirements. B. The Land Use Commission may grant a variance from a requirement of Section 25-8-422 (Water Supply Suburban Water Quality Transition Zone), Section 25-8-452 (Water Supply Rural Water Quality Transition Zone), Section 25-8-482 (Barton Springs Zone Water Quality Transition Zone), Section 25-8-368 (Restrictions on Development Impacting Lake Austin, Lady Bird Lake, and Lake Walter E. Long), or Article 7, Division 1 ( Critical Water Quality Zone Restrictions ), after determining that:: 1. 2. 3. The criteria for granting a variance in Subsection (A) are met; NA The requirement for which a variance is requested prevents a reasonable, economic use of the entire property; NA The variance is the minimum deviation from the code requirement necessary to allow a reasonable, economic use of the entire property. NA Staff Determination: Staff determines that the findings of fact have been met. Staff recommends the following condition: Applicant will provide landscape plan, including mitigation for removed trees, to provide enhanced soil stabilization and water quality for the site. Environmental Reviewer (DSD) ________________ (Pamela Abee-Taulli) Environmental Review Manager (DSD) _________________ (Mike McDougal) Deputy Environmental Officer (WPD) _________________ (Liz Johnston) Date 10/6/2021 Date: 10/6/2021 Date: 10/06/2021 Page 7 of 8 TABLE OF CONTENTS Copyright 2021 COA FIRE & EMS STATION – DAVENPORT VILLAGE 4601 Westlake Drive Austin, Texas 78746 LAND USE COMMISSION VARIANCE LDC 25-8-302(A)(S) Prepared for: City of Austin Development Services Department 505 Barton Springs Road Austin, Texas 78704 Prepared by: GARZA EMC, LLC. 7708 Rialto Blvd., Suite 125 Austin, Texas 78735 TBPE Registration No. F-14629 AUGUST 2021 Page 1 of 80L I S T O F E X H I B I T S SLOPE VARIANCE REQUEST LETTER ............................................................................... 3 SLOPE VARIANCE APPLICATION FORM ....................................................................... 5 SLOPE MAP.....................................................................................................................12 Page 2 of 80 SLOPE VARIANCE REQUEST LETTER EXHIBIT 1 Environmental Documents | COA Fire and EMS Station Davenport Village Page 3 of 80 August 11, 2021 Pamela Abee-Tualli, Environmental Program Coordinator Development Services Department 6310 Wilhelmina Delco Dr Austin, Texas 78752 RE: Land Use Commission Variance – Slope Requirements (LDC 25-8-302 (A)(2)) COA Fire and EMS Station – Davenport Village (SP-2021-0121D) 4601 Westlake Drive Austin, Travis County, Texas Dear Ms. Abee-Tualli, In accordance with with Chapter 25-8, Subchapter A of the City of Austin Land Development Code (LDC), we are requesting a Land Use Commission Variance for the requirements in Subchapter A Section 25-8-302 (A)(2) for slope requirements. According to Section 25-8-302 (A)(2), a building may not be constructed on slopes with a gradient of more than 25%, and parking areas may not be constructed on slopes with a gradient of more than 15%. The COA Fire and EMS Station – Davenport Village site is located at 4601 Westlake Drive. The site is composed of man-made rock slopes, with a slope range of 0-35% and an elevation range of 674-713 feet. No portion of the site is located in a floodplain or within the WQTZ. Due to the extensive man-made slopes on the site, the proposed project proposes construction of parking and buildings on slope exceeding 15%. The proposed Fire and EMS Station will provide emergency facilities that the surrounding community currently lacks. The proposed improvements are aligned on the property to have minimum deviation from the code slope requirements. This variance request is not necessitated by layout, construction method, nor other design decisions, but due to the manmade slopes and grades that make up most of the site area/LOC. Existing slopes on site were created as a result of construction activities during development of the subdivision to the immediate north of the project site, as well as the construction of Westlake Drive, a public ROW road. Aerial photos that demonstrate the above statement have been included as part of this variance application package. To provide a building accessible by emergency vehicles from the ROW and to provide on-site water quality and detention to City requirement, a variance from slope limitations for allowed construction set by code is required. If you should have any questions or comments regarding the above request, please do not hesitate to contact our office. Sincerely, Anna Merryman, P.E. Project Engineer V:\102824-00014\Civil\01-Word Docs\Letters\2021-08-11 Land Use Commission - Slope Variance Letter.docx 7708 Rialto Boulevard Suite 125 Austin, Texas 78735 o: 512.298.3284 f: 512.298.2592 www.garzaemc.com TBPE No. F-14629 Sincerely, Anna Merryman, P.E. Page 4 of 80 SLOPE VARIANCE APPLICATION FORM EXHIBIT 2 Environmental Documents | COA Fire and EMS Station Davenport Village Page 5 of 80ENVIRONMENTAL COMMISSION VARIANCE APPLICATION FORM August 11, 2021 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 Watershed Classification PROJECT DESCRIPTION Applicant Contact Information Anna Merryman 7708 Rialto Blvd., Suite 125 Austin, Texas 78735 512-298-3284 amerryman@garzaemc.com Variance Case Information COA Fire and EMS Station – Davenport Village 4601 Westlake Drive, Austin, Texas 78746 SP-2021-0121D Pamela Abee-Taulli Eric Brown Watershed Protection Ordinance St. Stephens Creek ☐Urban ☐ Suburban ☐Water Supply Suburban X Water Supply Rural ☐ Barton Springs Zone City of Austin | Environmental Commission Variance Application Guide 1 Page 6 of 80August 11, 2021 Edwards Aquifer Recharge Zone ☐ Barton Springs Segment ☐ Northern Edwards Segment X Not in Edwards Aquifer Zones Edwards Aquifer Contributing Zone Distance to Nearest Classified Waterway Water and Waste Water service to be provided by ☐ Yes X No 2,300 feet Aqua Texas and Austin Water Request The variance request is as follows (Cite code references: Per City of Austin Land Development Code Section 25-8-302(A)(2), a construction on slope of more than 15% variance is requested. Existing ____0____ ____0____ ____0____ Proposed _____36590.4_____ _____0.84_____ _____0.34%_____ The site has a slope range of 0-35% and an elevation range of 674-713. There are 8 existing trees proposed to be removed from the site and 4 existing live oak and 1 existing red oaks proposed to remain. The site is composed of man-made rock slopes. This portion of the tract is not in the floodplain and does not encroach into the WQTZ. 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) City of Austin | Environmental Commission Variance Application Guide 2 Page 7 of 80August 11, 2021 Clearly indicate in what way the proposed project does not comply with current Code (include maps and exhibits) FINDINGS OF FACT The surface parking lot is located on slopes over 15 percent. [LDC 25-8-302(A)(2)] As required in LDC Section 25-8-41, 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: City of Austin Fire and EMS Station – Davenport Village Ordinance: A. 1. Land Use Commission variance determinations from Chapter 25-8-41 of the City Code: Existing slopes on site are man-made and were created as a result of 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 / No construction activities during development of the subdivision to the immediate north of the project site, as well as the construction of Westlake Drive, a public ROW road. Aerial photos that demonstrate the above statement have been included as part of this variance application package. As a result of this previous earthwork, this site cannot be developed without the requested variance from the cut/fill maximum and construction on slopes limitations sections of code contained within Title 25. Owners of similarly situated sites subject to similar code requirements that do not contain these manmade slopes and grades would be able to develop their properties to the use and density proposed by this project without a need of a code variance. 2. The variance: a) 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; City of Austin | Environmental Commission Variance Application Guide 3 Page 8 of 80August 11, 2021 b) c) Variance request is not necessitated by layout, construction Yes / No method, nor other design decisions, but due to the manmade slopes and grades that make up most of the site area/LOC. To provide a building accessible by vehicles from the ROW, a variance from the cut/fill limitations set by code is required. Similarly, to provide on-site water quality and detention to City requirements, as well as to protect public life and safety, stormwater infrastructure is required to be constructed at a location where runoff from the site improvements can be collected prior to discharging from the site. Due to the slopes and grades on site, a variance from the construction on slopes limitation set by code is required. Is the minimum deviation from the code requirement necessary to allow a reasonable use of the property; The surrounding area does not have adequate access to Yes / No emergency facilities. This development will provide fire and EMS access that the community currently lacks. The proposed improvements are aligned on the property to cause the least amount of disturbance to the existing site and to have minimum deviation from the code requirements for construction on slope limitations. Does not create a significant probability of harmful environmental consequences. The proposed improvements will not create a significant Yes / No probability of harmful environmental consequences as the slopes on this site are man-made from previous construction along Westlake Drive. Development with the variance will result in water quality that is at least equal to the water quality achievable without the variance. Yes / No The variance will allow for a greater water quality volume on this site, than development without the variance. There would not be adequate space to provide parking and other necessities of the fire and EMS station employees if the water quality pond were to be relocated. 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; Yes / No N/A City of Austin | Environmental Commission Variance Application Guide 4 3. 1. B. Page 9 of 80August 11, 2021 2. 3. N/A The requirement for which a variance is requested prevents a reasonable, economic use of the entire property; Yes / No The variance is the minimum deviation from the code requirement necessary to allow a reasonable, economic use of the entire property. Yes / No N/A **Variance approval requires all above affirmative findings. City of Austin | Environmental Commission Variance Application Guide 5 Page 10 of 80August 11, 2021 A Exhibits for Commission Variance o Aerial photos of the site o Site photos o Aerial photos of the vicinity o Context Map—A map illustrating the subject property in relation to developments in the vicinity to include nearby major streets and waterways o Topographic Map - A topographic map is recommended if a significant grade change on the subject site exists or if there is a significant difference in grade in relation to adjacent properties. o For cut/fill variances, a plan sheet showing areas and depth of cut/fill with topographic elevations. o Site plan showing existing conditions if development exists currently on the property o Proposed Site Plan- full size electronic or at least legible 11x17 showing proposed development, include tree survey if required as part of site or subdivision plan o Environmental Map – A map that shows pertinent features including Floodplain, CWQZ, WQTZ, CEFs, Setbacks, Recharge Zone, etc. o An Environmental Resource Inventory pursuant to ECM 1.3.0 (if required by 25-8-121) o Applicant’s variance request letter City of Austin | Environmental Commission Variance Application Guide 6 Page 11 of 80 EXHIBIT 3 SLOPE MAP Environmental Documents | COA Fire and EMS Station Davenport Village Page 12 of 80D A V E N P O LA N Z D U O S ST P.U.D.-TR A CT F, RT R S E A N C CTIO D O E H W N 4 B C K E C. 200600123 BLO LOT 16 G: P P E U D N S NIN E: O P A C E FIR M E & E FFE=692.0' 12,525 SF S STATIO N A I L ) R U N N T Y R R I A T N S N E U D B E ( P WATER TREATMENT & DETENTION POND PROPERTY LINE SECURE PARKING 24 SPACES DUMPSTERS / TRASH S E C U R E G A T E ST. STE P H E D O N'S S C. 90/204 BLO C K ELO T 1 G: P E: CIVIC U D Z O LA N NIN D U S C H O OL 6 ) 1 7 R - 2 D 5 7 - 0 ( 8 " S 0 7 1 5 7 - 0 2 " D I 0 1 6 ) 7 1 R - 2 D 5 7 - 0 ( 8 " S 0 6 " D I 0 7 - 0 5 1 7 D A V E N P.U.D.-TR P O D O N A E A P RT R CT F, S C. 200600123 RTCTBLO C K DLO T 1 G: P S E: MILY D U M Z O LA NIN N D U ULTI-FA C H W CTIO E ST N 4 B ∆ (VARIABLE WIDTH RO W) W ESTLAKE DRIVE 12" DI 07-0517 R-26) 07-0517 (8" SD 12" DI 07-0517 6) R-2 7 1 5 D 7-0 (8" S 0 Slopes Table 2 9 5 2 - 8 9 2 ) 2 1 5 ( x a F 4 8 2 3 - 8 9 2 ) 2 1 5 ( . l e T 1 2 0 2 t h g i r y p o C © C L L , C M E a z r a G 9 2 6 4 1 - F # E P B T 5 2 1 e t i u S l , . d v B o t l a R 8 0 7 7 i 5 3 7 8 7 s a x e T , n i t s u A I G N D A R G P A M E P O L S I I T B H X E E G A L L I V T R O P N E V A D - I N O T A T S E R F A O C I I 6 4 7 8 7 X T N T S U A D A O R L O O H C S S N E H P E T S . T S 0 0 5 6 I L A P O C S P E S N E H P E T S ' . T S L O O H C S 4 1 0 0 0 - 4 2 8 2 0 1 : . O N T C E J O R P : Y B D E N G S E D I : Y B N W A R D : C Q / A Q SHEET EXH OF M P 3 2 : 2 1 1 2 , 8 l u J n o l a e r r a l l i v j y b d e i f i d o m g w d . t i i b h x E p a M e p o S d n A l l l i F t \ u C p a M e p o S d n A l l l i F t u C 8 0 - 7 0 - 1 2 0 2 \ S T B H X E D A C - 0 0 \ l i I \ I i v C \ 4 1 0 0 0 - 4 2 8 2 0 1 \ : V SP-2021-XXXXD Page 13 of 80 TABLE OF CONTENTS Copyright 2021 COA FIRE & EMS STATION – DAVENPORT VILLAGE 4601 Westlake Drive Austin, Texas 78746 LAND USE COMMISSION VARIANCE LDC 25-8-341 Prepared for: City of Austin Development Services Department 505 Barton Springs Road Austin, Texas 78704 Prepared by: GARZA EMC, LLC. 7708 Rialto Blvd., Suite 125 Austin, Texas 78735 TBPE Registration No. F-14629 AUGUST 2021 Page 14 of 80L I S T O F E X H I B I T S CUT VARIANCE REQUEST LETTER ................................................................................... 16 CUT VARIANCE APPLICATION FORM ........................................................................... 18 CUT MAP ........................................................................................................................ 25 AERIAL PHOTOS ............................................................................................................. 27 SITE PHOTOS ................................................................................................................... 41 CONTEXT MAP ............................................................................................................... 46 TOPOGRAPHIC MAP ..................................................................................................... 48 PROPOSED SITE PLAN .................................................................................................... 50 ENVIRONMENTAL RESOURCE INVENTORY ................................................................... 52 BCCP HABITAT MITIGATION .......................................................................................... 77 Page 15 of 80 CUT VARIANCE REQUEST LETTER EXHIBIT 1 Environmental Documents | COA Fire and EMS Station Davenport Village Page 16 of 80 August 11, 2021 Pamela Abee-Tualli, Environmental Program Coordinator Development Services Department 6310 Wilhelmina Delco Dr Austin, Texas 78752 RE: Land Use Commission Variance – Cut Requirements (LDC 25-8-341) COA Fire and EMS Station – Davenport Village (SP-2021-0121D) 4601 Westlake Drive Austin, Travis County, Texas Dear Ms. Abee-Tualli, In accordance with Chapter 25-8, Subchapter A of the City of Austin Land Development Code (LDC), we are requesting a Land Use Commission Variance for the requirements in Subchapter A Section 25-8-341 for cut requirements. According to Section 25-8-341, cuts on a tract may not exceed four feet of depth for construction of a water quality control or detention facility if the cut is located on a slope with a gradient of more than 15%. The COA Fire and EMS Station – Davenport Village site is located at 4601 Westlake Drive. The site is composed of man-made rock slopes, with a slope range of 0-35% and an elevation range of 674-713 feet. No portion of the site is located in a floodplain or within the WQTZ. Due to the extensive man-made slopes on the site, the proposed project proposes cut greater than 4 feet for the construction of the on-site stormwater control pond and the improvements surrounding the building pad. The proposed Fire and EMS Station will provide emergency facilities that the surrounding community currently lacks. The proposed improvements are aligned on the property to have minimum deviation from the code cut requirements. This variance request is not necessitated by layout, construction method, nor other design decisions, but due to the manmade slopes and grades that make up most of the site area/LOC. Existing slopes on site were created as a result of construction activities during development of the subdivision to the immediate north of the project site, as well as the construction of Westlake Drive, a public ROW road. Aerial photos that demonstrate the above statement have been included as part of this variance application package. To provide a building accessible by emergency vehicles from the ROW and to provide on-site water quality and detention to City requirements, a variance from the cut limitations set by code is requested. If you should have any questions or comments regarding the above request, please do not hesitate to contact our office. Sincerely, Anna Merryman, P.E. Project Engineer V:\102824-00014\Civil\01-Word Docs\Letters\2021-08-11 Land Use Commission - Cut Variance Letter.docx 7708 Rialto Boulevard Suite 125 Austin, Texas 78735 o: 512.298.3284 f: 512.298.2592 www.garzaemc.com TBPE No. F-14629 Page 17 of 80 CUT VARIANCE APPLICATION FORM EXHIBIT 2 Environmental Documents | COA Fire and EMS Station Davenport Village Page 18 of 80ENVIRONMENTAL COMMISSION VARIANCE APPLICATION FORM August 11, 2021 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 Watershed Classification PROJECT DESCRIPTION Applicant Contact Information Anna Merryman 7708 Rialto Blvd., Suite 125 Austin, Texas 78735 512-298-3284 amerryman@garzaemc.com Variance Case Information COA Fire and EMS Station – Davenport Village 4601 Westlake Drive, Austin, Texas 78746 SP-2021-0121D Pamela Abee-Taulli Eric Brown Watershed Protection Ordinance St. Stephens Creek ☐Urban ☐ Suburban ☐Water Supply Suburban X Water Supply Rural ☐ Barton Springs Zone City of Austin | Environmental Commission Variance Application Guide 1 Page 19 of 80August 11, 2021 Edwards Aquifer Recharge Zone ☐ Barton Springs Segment ☐ Northern Edwards Segment X Not in Edwards Aquifer Zones Edwards Aquifer Contributing Zone Distance to Nearest Classified Waterway Water and Waste Water service to be provided by ☐ Yes X No 2,300 feet Aqua Texas and Austin Water Request The variance request is as follows (Cite code references: Per City of Austin Land Development Code Section 25-8-341, a cut variance is requested. Existing ____0____ ____0____ ____0____ Proposed _____36590.4_____ _____0.84_____ _____0.34%_____ The site has a slope range of 0-35% and an elevation range of 674-713. There are 8 existing trees proposed to be removed from the site and 4 existing live oak and 1 existing red oaks proposed to remain. The site is composed of man-made rock slopes. This portion of the tract is not in the floodplain and does not encroach into the WQTZ. 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) City of Austin | Environmental Commission Variance Application Guide 2 Page 20 of 80August 11, 2021 Clearly indicate in what way the proposed project does not comply with current Code (include maps and exhibits) FINDINGS OF FACT The proposed project proposes cut greater than 4 feet as part of the pond design and improvements surrounding the building pad. [LDC 25- 8-341] As required in LDC Section 25-8-41, 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: City of Austin Fire and EMS Station – Davenport Village Ordinance: A. 1. Land Use Commission variance determinations from Chapter 25-8-41 of the City Code: Existing slopes on site are man-made and were created as a result of 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 / No construction activities during development of the subdivision to the immediate north of the project site, as well as the construction of Westlake Drive, a public ROW road. Aerial photos that demonstrate the above statement have been included as part of this variance application package. As a result of this previous earthwork, this site cannot be developed without the requested variance from the cut/fill maximum and construction on slopes limitations sections of code contained within Title 25. Owners of similarly situated sites subject to similar code requirements that do not contain these manmade slopes and grades would be able to develop their properties to the use and density proposed by this project without a need of a code variance. 2. The variance: a) 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; City of Austin | Environmental Commission Variance Application Guide 3 Page 21 of 80August 11, 2021 b) c) Variance request is not necessitated by layout, construction Yes / No method, nor other design decisions, but due to the manmade slopes and grades that make up most of the site area/LOC. To provide a building accessible by vehicles from the ROW, a variance from the cut/fill limitations set by code is required. Similarly, to provide on-site water quality and detention to City requirements, as well as to protect public life and safety, stormwater infrastructure is required to be constructed at a location where runoff from the site improvements can be collected prior to discharging from the site. Due to the slopes and grades on site, a variance from the construction on slopes limitation set by code is required. Is the minimum deviation from the code requirement necessary to allow a reasonable use of the property; The surrounding area does not have adequate access to Yes / No emergency facilities. This development will provide fire and EMS access that the community currently lacks. The proposed improvements are aligned on the property to cause the least amount of disturbance to the existing site and to have minimum deviation from the code requirement for allowable cut. Does not create a significant probability of harmful environmental consequences. The proposed improvements will not create a significant Yes / No probability of harmful environmental consequences as the slopes on this site are man-made from previous construction along Westlake Drive. Development with the variance will result in water quality that is at least equal to the water quality achievable without the variance. Yes / No The variance will allow for a greater water quality volume on this site, than development without the variance. There would not be adequate space to provide parking and other necessities of the fire and EMS station employees if the water quality pond were to be relocated. 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; Yes / No N/A City of Austin | Environmental Commission Variance Application Guide 4 3. 1. B. Page 22 of 80August 11, 2021 2. 3. N/A The requirement for which a variance is requested prevents a reasonable, economic use of the entire property; Yes / No The variance is the minimum deviation from the code requirement necessary to allow a reasonable, economic use of the entire property. Yes / No N/A **Variance approval requires all above affirmative findings. City of Austin | Environmental Commission Variance Application Guide 5 Page 23 of 80August 11, 2021 A Exhibits for Commission Variance o Aerial photos of the site o Site photos o Aerial photos of the vicinity o Context Map—A map illustrating the subject property in relation to developments in the vicinity to include nearby major streets and waterways o Topographic Map - A topographic map is recommended if a significant grade change on the subject site exists or if there is a significant difference in grade in relation to adjacent properties. o For cut/fill variances, a plan sheet showing areas and depth of cut/fill with topographic elevations. o Site plan showing existing conditions if development exists currently on the property o Proposed Site Plan- full size electronic or at least legible 11x17 showing proposed development, include tree survey if required as part of site or subdivision plan o Environmental Map – A map that shows pertinent features including Floodplain, CWQZ, WQTZ, CEFs, Setbacks, Recharge Zone, etc. o An Environmental Resource Inventory pursuant to ECM 1.3.0 (if required by 25-8-121) o Applicant’s variance request letter City of Austin | Environmental Commission Variance Application Guide 6 Page 24 of 80 EXHIBIT 3 CUT MAP Environmental Documents | COA Fire and EMS Station Davenport Village Page 25 of 80FPJ ETJ PROPERTY LINE AIL) N TR N U Y R N N U B (PEDESTRIA WATER TREATMENT & DETENTION POND DAVENPORT RANCH WEST P.U.D.-TRACT F, SECTION 4 B DOC. 200600123 BLOCK E LOT 16 ZONING: PUD LAND USE: OPEN SPACE DUMPSTERS / TRASH N E G SECURE GATE SECURE PARKING 24 SPACES FIRE & EMS STATION FFE=692.0' 12,525 SF ST. STEPHEN'S SCHOOL DOC. 90/204 BLOCK E LOT 1 ETJ LAND USE: CIVIC SDMH #210004 (TOP=678.29) (18" FL IN=674.20) (18" FL IN=674.20) (24" FL IN=668.00) 10' CURB INLET #210022 TOP=679.2 LIP OF GUTTER FL=678.69 (18" FL OUT (E)=674.74) 10' CURB INLET #240243 TOP=679.20 LIP OF GUTTER FL=679.45 (18" FL OUT (E)=674.71) (18" RCP) FPJ ETJ (18" RCP) (24" RCP) 12" DI 07-0517 ( 1 8 " R C P ) SDMH #210027 (TOP=682.27) (18" FL IN=678.30) (24" FL IN=676.16) R-26) 07-0517 (8" S D N TIO C E S #31586 6" DI 07-0517 R E T A IN O C P) C 4" R (2 WWMH #210040 (8" FL IN=678.5) (8" FL OUT=673.29) (8" FL IN(E)=675.7 PJ F TJ E ∆ T W) ( 1 8 " RCP ) O E H R RIV E D E WID K A L T S RIA E W A (V L B DAVENPORT RANCH WEST P.U.D.-TRACT F, SECTION 4 B DOC. 200600123 ZONING: PUD LAND USE: MULTI-FAMILY WWMH #210065 (8" FL IN=685.00) (8" FL OUT=684.90) J P F J T E 7 1 5 0 - 7 " DI 0 2 1 ) 6 2 - R D S " 8 ( 7 1 5 0 - 7 0 ) P C " R 4 2 ( WWMH #210087 (8" FL IN=689.60) (8" FL OUT=689.50) 10' CURB INLET #240351 TOP=699.00 LIP OF GUTTER FL=698.97 (18" FL OUT (E)=694.5) SDMH #210086 (TOP=698.90) (18" FL IN=694.35) (18" FL IN=694.35) (24" FL IN=693.75) (18" RCP) 7 1 5 0 - 7 0 I D " 2 1 (18" RCP) ) 6 2 - R D S " 8 ( 7 1 5 0 - 7 0 ) P C R " 4 2 ( 10' CURB INLET #240353 TOP=699.00 LIP OF GUTTER FL=699.53 (18" FL OUT (E)=694.50) 2 9 5 2 - 8 9 2 ) 2 1 5 ( x a F 4 8 2 3 - 8 9 2 ) 2 1 5 ( . l e T 1 2 0 2 t h g i r y p o C © C L L , C M E a z r a G 9 2 6 4 1 - F # E P B T 5 2 1 e t i u S l , . d v B o t l a R 8 0 7 7 i 5 3 7 8 7 s a x e T , n i t s u A I I I T B H X E G N D A R G L L I F T U C / E G A L L I V T R O P N E V A D - I N O T A T S E R F A O C I I 6 4 7 8 7 X T N T S U A D A O R L O O H C S S N E H P E T S . T S 0 0 5 6 I L A P O C S P E S N E H P E T S ' . T S L O O H C S 4 1 0 0 0 - 4 2 8 2 0 1 : . O N T C E J O R P : Y B D E N G S E D I : Y B N W A R D : C Q / A Q SHEET EXH OF M P 6 1 : 6 1 2 , 0 3 l u J n o n a m y r r e m a y b d e i f i d o m g w d . t i i b h x E p a M e p o S d n A l l l i F t \ u C p a M e p o S d n A l l l i F t u C 8 0 - 7 0 - 1 2 0 2 \ S T B H X E D A C - 0 0 \ l i I \ I i v C \ 4 1 0 0 0 - 4 2 8 2 0 1 \ : V SP-2021-0121D Page 26 of 80 EXHIBIT 4 AERIAL PHOTOS Environmental Documents | COA Fire and EMS Station Davenport Village Page 27 of 80WESTLAKE DRIVE - 1940Page 28 of 80WESTLAKE DRIVE - 1958Page 29 of 80WESTLAKE DRIVE - 1965Page 30 of 80WESTLAKE DRIVE - 1983Page 31 of 80WESTLAKE DRIVE - 1984Page 32 of 80WESTLAKE DRIVE - 1987Page 33 of 80WESTLAKE DRIVE - 2000Page 34 of 80WESTLAKE DRIVE - 2003Page 35 of 80WESTLAKE DRIVE - 2006Page 36 of 80WESTLAKE DRIVE - 2009Page 37 of 80WESTLAKE DRIVE - 2011Page 38 of 80WESTLAKE DRIVE - 2012Page 39 of 80WESTLAKE DRIVE - 2014Page 40 of 80 EXHIBIT 5 SITE PHOTOS Environmental Documents | COA Fire and EMS Station Davenport Village Page 41 of 80Page 42 of 80Page 43 of 80Page 44 of 80Page 45 of 80 EXHIBIT 6 CONTEXT MAP Environmental Documents | COA Fire and EMS Station Davenport Village Page 46 of 80AREA = 1.60 ACRES PROJECT SITE LOCATION © 2021 Microsoft Corporation © 2021 Maxar ©CNES (2021) Distribution Airbus DS © 2021 Microsoft Corporation © 2021 Maxar ©CNES (2021) Distribution Airbus DS © 2021 Microsoft Corporation © 2021 Maxar ©CNES (2021) Distribution Airbus DS © 2021 Microsoft Corporation © 2021 Maxar ©CNES (2021) Distribution Airbus DS © 2021 Microsoft Corporation © 2021 Maxar ©CNES (2021) Distribution Airbus DS © 2021 Microsoft Corporation © 2021 Maxar ©CNES (2021) Distribution Airbus DS r o © 2021 Microsoft Corporation © 2021 Maxar ©CNES (2021) Distribution Airbus DS © 2021 Microsoft Corporation © 2021 Maxar ©CNES (2021) Distribution Airbus DS © 2021 Microsoft Corporation © 2021 Maxar ©CNES (2021) Distribution Airbus DS © 2021 Microsoft Corporation © 2021 Maxar ©CNES (2021) Distribution Airbus DS © 2021 Microsoft Corporation © 2021 Maxar ©CNES (2021) Distribution Airbus DS © 2021 Microsoft Corporation © 2021 Maxar ©CNES (2021) Distribution Airbus DS ti o a COA FIRE & EMS STATION - DAVENPORT VILLAGE 4601 WESTLAKE DR. AUSTIN, TX 78746 p r o o f t C s o 1 M i c r 2 0 © 2 SITE LOCATION MAP 7708 Rialto Blvd., Suite 125 Austin, Texas 78735 Tel. (512) 298-3284 Fax (512) 298-2592 TBPE # F-14629 Garza EMC, LLC © Copyright 2021 DATE: 07-19-2021 SCALE: 1:400 DRAWN BY: FILE: PROJECT No. : 102824-00014 V:\102824-00014\Civil\00-CAD\EXHIBITS\ENGR Report EXH\x102824-00014-VICINITY MAP.dwg modified by amerryman on Apr 9, 21 5:41 PM 1 ) D i s 2 0 S ( 2 E N r © C a x 1 M a 2 0 n © 2 Page 47 of 80 EXHIBIT 7 TOPOGRAPHIC MAP Environmental Documents | COA Fire and EMS Station Davenport Village Page 48 of 802 9 5 2 - 8 9 2 ) 2 1 5 ( x a F 4 8 2 3 - 8 9 2 ) 2 1 5 ( . l e T 1 2 0 2 t h g i r y p o C © C L L , C M E a z r a G 9 2 6 4 1 - F # E P B T 5 2 1 e t i u S , . l d v B o t l i a R 8 0 7 7 5 3 7 8 7 s a x e T , n i t s u A I N O S V E R I . O N E T A D I G N T S X E I - T E E H S Y E V R U S I S N O T D N O C I E G A L L I V T R O P N E V A D - I N O T A T S E R F A O C I I 6 4 7 8 7 X T N T S U A D A O R L O O H C S S N E H P E T S . T S 0 0 5 6 I L A P O C S P E S N E H P E T S ' . T S L O O H C S 4 1 0 0 0 - 4 2 8 2 0 1 : . O N T C E J O R P : Y B D E N G S E D I : Y B N W A R D : C Q / A Q SHEET 04 OF 29 M P 2 3 : 2 1 2 , 9 r p A n o n a m y r r e m a y b d e i f i d o m g w d . V R U S - 4 1 0 0 0 - 4 2 8 2 0 1 \ D A C - 0 0 \ l i i \ v C 4 1 0 0 0 - 4 2 8 2 0 1 \ : V SP-2021-0121D Page 49 of 80 EXHIBIT 8 PROPOSED SITE PLAN Environmental Documents | COA Fire and EMS Station Davenport Village Page 50 of 80DAVENPORT RANCH WEST P.U.D.-TRACT F, SECTION 4 B DOC. 200600123 BLOCK E LOT 16 ZONING: PUD LAND USE: OPEN SPACE EXISTING PROPOSED DESCRIPTION LEGEND DUMPSTERS / TRASH DUMPSTERS / TRASH N N E E G G FPJ ETJ PROPERTY LINE PROPERTY LINE AIL) N TR N U Y R N N U B (PEDESTRIA WATER TREATMENT WATER TREATMENT & DETENTION POND & DETENTION POND SECURE GATE SECURE GATE SECURE PARKING SECURE PARKING 24 SPACES 24 SPACES FIRE & EMS STATION FIRE & EMS STATION FFE=692.0' FFE=692.0' 12,525 SF 12,525 SF DAVENPORT RANCH WEST P.U.D.-TRACT F, SECTION 4 B DOC. 200600123 PRTCT BLOCK D LOT 1 ZONING: PUD LAND USE: MULTI-FAMILY FPJ ETJ J P F J T E PJ F TJ E ∆ N TIO C E S #31586 R E T A IN O C E RIV E D K A L T S E W T W) O H R E WID RIA A (V L B ST. STEPHEN'S SCHOOL DOC. 90/204 BLOCK E LOT 1 ETJ LAND USE: CIVIC SITE PLAN KEY NOTES 2 9 5 2 - 8 9 2 ) 2 1 5 ( x a F 4 8 2 3 - 8 9 2 ) 2 1 5 ( . l e T 1 2 0 2 t h g i r y p o C © C L L , C M E a z r a G 9 2 6 4 1 - F # E P B T 5 2 1 e t i u S , . l d v B o t l i a R 8 0 7 7 5 3 7 8 7 s a x e T , n i t s u A I N O S V E R I . O N E T A D I N A L P G N V A P & E T S I E G A L L I V T R O P N E V A D - I N O T A T S E R F A O C I I 6 4 7 8 7 X T N T S U A D A O R L O O H C S S N E H P E T S . T S 0 0 5 6 I L A P O C S P E S N E H P E T S ' . T S L O O H C S 4 1 0 0 0 - 4 2 8 2 0 1 : . O N T C E J O R P : Y B D E N G S E D I : Y B N W A R D : C Q / A Q SHEET 10 OF 30 M P 4 5 : 7 1 2 , 0 3 l u J n o n a m y r r e m a y b d e i f i d o m g w d . E T S - 4 1 0 0 0 - 4 2 8 2 0 1 \ D A C - 0 0 \ l i I i \ v C 4 1 0 0 0 - 4 2 8 2 0 1 \ : V SP-2021-0121D Page 51 of 80 ENVIRONMENTAL RESOURCE INVENTORY EXHIBIT 9 Environmental Documents | COA Fire and EMS Station Davenport Village Page 52 of 80Page 53 of 80Page 54 of 80Page 55 of 80Page 56 of 80Page 57 of 80Page 58 of 80 Attachment 1 Site Features Description, Photos, and Worksheet Page 59 of 80On November 5th, 2020, a site investigation was conducted by professional geoscientists and biologists from Freese and Nichols, Inc. No critical environmental features (CEFs) were found on the project site during the investigation. However, one rock outcrop was discovered. This outcrop was not considered a Canyon Rimrock CEF because per the Environmental Criteria Manual, “Canyon rimrock do not include man-made cuts such as roadside rock outcrops and rock quarry walls. Generally, rimrocks are associated with riparian areas and tributary canyons.” (City of Austin, 2020). The outcrop is approximately 250 feet in length and bisects the site in an arc, beginning in the center of the site extending into the northeastern quadrant. This feature consists of a near vertical rock face exposing the Glen Rose Limestone (Member 4). The height of this outcrop is highest in the center of the feature at approximately 14 feet in height and tapers at its edges as gradually ties into the ground surface. The base of the base of this outcrop is likely boundary between Member 4 and the underlying Member 3 of the Glen Rose Formation. This feature did not appear to be karstic on this site and was not a point recharge feature, seep, or spring. This outcrop does not qualify as a Canyon Rimrock because the feature was not formed naturally, but was exposed, during past site development consisting of aggregate mining and/or nearby road and trail construction. The determination that this feature is not a CEF is substantiated by the following evidence: • Historical Aerials show site alterations occurred as early as 1964. However exposure of the outcrop first appears in aerials in 1996. This change coincides with land development on and adjacent to the project site. Most convincingly, spoil piles from aggregate mining can be seen in from aggregate mining operations. Historical aerials are shown in Attachment 2, Figure 2 - 4. • The topography on most of the site slopes gently and consistently to the northwest toward St Stephens Creek. This slope is broken by the bluff and plateau below the bluff along the outcrop, forming a “stair-step” configuration. This is frequently seen where aggregate has been excavated. Rock is cut from the side of a hill forming a mined vertical wall with a constructed road/flat surface at its base. Because this is present at the site, mining likely happened to form the bedrock outcrop. • Further evidence of the bluff being artificially created includes the presence of silt fence and • drainage control measures below the bluff which is. The presence of silt fences along the side of a flat road-like trail along at base of the bluff indicate that some form of site development has occurred in the past. Lastly, debris composed of concrete riprap and fallen bedrock talus is present at the toe of the bluff on the site. The bedrock present on-site are listed as moderately hard to hard rock (City of Rodda et al., 1970). This was also observed during the site visit. This means that it is unlikely that the bedrock was placed here by erosion or natural causes but during site development or quarrying. These findings were discussed with the City of Austin’s senior geologist, Scott Hiers, P.G. on November 23rd, 2020. His assessment of current conditions based on the available data corroborated the findings that the rock outcrop at the site is not a Canyon Rimrock CEF. Page 60 of 80Photo 1. View of the middle of the outcrop facing South East. At this location, the outcrop is approximately 10 feet tall and has concrete debris along its base. Photo 2. View facing south at the northern extent of the outcrop as it tapers and gradually ties into the ground surface (left side of the photo). Page 61 of 80Photo 3. View of concrete debris along the base of the outcrop. Page 62 of 80Page 63 of 80 Attachment 2: Figure 1 – Site Specific Geologic Map with 2-ft Topography Figure 2 – Historical Aerial Imagery Map – 1952 Figure 3 – Historical Aerial Imagery Map – 1996 Figure 4 – Historical Aerial Imagery Map – 2006 Figure 5 – Site Soils Map Figure 6 – CEFs and Wells Page 64 of 80Site Boundary Glen Rose Lime Stone, Member 4 Glen Rose Lime Stone, Member 3 FNI PROJECT NUMBER DATE CREATED FILE NAME PREPARED BY DATUM & COORDINATE SYSTEM NAD83 State Plane (Feet) Texas Central AU220752 Date: 11/10/2020 Name: 1_Geol_2ftopo HHM FREESE AND NICHOLS, INC. 10431 MORADO CIRCLE SUITE 300 AUSTIN, TEXAS 78759 PHONE: 512-617-3100 FAX: 512-617-3101 0 50 100 200 Feet CITY OF AUSTIN Loop 360/Davenport Fire/EMS ERI Site Specific Geologic Map with 2-ft Topography µ FIGURE 1 Date Saved: 11/10/2020 12:36:57 PM Path: T:\ES\GIS\FINAL_EXHIBITS\Geologic_Investigation\1_Geol_2ftopo.mxd Page 65 of 80Site Boundary FNI PROJECT NUMBER DATE CREATED FILE NAME PREPARED BY DATUM & COORDINATE SYSTEM NAD83 State Plane (Feet) Texas Central AU220752 Date: 11/30/2020 Name: 2_Historical HHM FREESE AND NICHOLS, INC. 10431 MORADO CIRCLE SUITE 300 AUSTIN, TEXAS 78759 PHONE: 512-617-3100 FAX: 512-617-3101 0 187.5 375 CITY OF AUSTIN Loop 360/Davenport Fire/EMS ERI Historical Aerial Imagery -1952 750 Feet µ FIGURE 2 Date Saved: 11/30/2020 4:36:40 PM Path: T:\ES\GIS\FINAL_EXHIBITS\Geologic_Investigation\2_Historical.mxd Page 66 of 80Site Boundary FNI PROJECT NUMBER DATE CREATED FILE NAME PREPARED BY DATUM & COORDINATE SYSTEM NAD83 State Plane (Feet) Texas Central AU220752 Date: 11/30/2020 Name: 2_Historical HHM FREESE AND NICHOLS, INC. 10431 MORADO CIRCLE SUITE 300 AUSTIN, TEXAS 78759 PHONE: 512-617-3100 FAX: 512-617-3101 0 155 310 CITY OF AUSTIN Loop 360/Davenport Fire/EMS ERI Historical Aerial Imagery -1996 620 Feet µ FIGURE 3 Date Saved: 11/30/2020 4:36:40 PM Path: T:\ES\GIS\FINAL_EXHIBITS\Geologic_Investigation\2_Historical.mxd Page 67 of 80Spoil Piles Site Boundary FNI PROJECT NUMBER DATE CREATED FILE NAME PREPARED BY DATUM & COORDINATE SYSTEM NAD83 State Plane (Feet) Texas Central AU220752 Date: 11/30/2020 Name: 2_Historical HHM FREESE AND NICHOLS, INC. 10431 MORADO CIRCLE SUITE 300 AUSTIN, TEXAS 78759 PHONE: 512-617-3100 FAX: 512-617-3101 0 90 180 360 Feet CITY OF AUSTIN Loop 360/Davenport Fire/EMS ERI Historical Aerial Imagery - 2006 µ FIGURE 4 Date Saved: 11/30/2020 4:36:40 PM Path: T:\ES\GIS\FINAL_EXHIBITS\Geologic_Investigation\2_Historical.mxd Page 68 of 80Site Boundary Brackett-Rock outcrop complex Volente silty clay loam FNI PROJECT NUMBER DATE CREATED FILE NAME PREPARED BY DATUM & COORDINATE SYSTEM NAD83 State Plane (Feet) Texas Central AU220752 Date: 11/30/2020 Name: 3_Soils HHM FREESE AND NICHOLS, INC. 10431 MORADO CIRCLE SUITE 300 AUSTIN, TEXAS 78759 PHONE: 512-617-3100 FAX: 512-617-3101 Date Saved: 11/30/2020 4:12:15 PM Path: T:\ES\GIS\FINAL_EXHIBITS\Geologic_Investigation\3_Soils.mxd 0 150 300 CITY OF AUSTIN Loop 360/Davenport Fire/EMS ERI Site Soil Map 600 Feet µ FIGURE 5 Page 69 of 80No CEFs or Wells Present Site Boundary FNI PROJECT NUMBER DATE CREATED FILE NAME PREPARED BY DATUM & COORDINATE SYSTEM NAD83 State Plane (Feet) Texas Central AU220752 Date: 11/30/2020 Name: 6_CEFs HHM FREESE AND NICHOLS, INC. 10431 MORADO CIRCLE SUITE 300 AUSTIN, TEXAS 78759 PHONE: 512-617-3100 FAX: 512-617-3101 0 150 300 CITY OF AUSTIN Loop 360/Davenport Fire/EMS ERI Critical Environmental Features and Wells 600 Feet µ FIGURE 6 Date Saved: 11/30/2020 5:12:59 PM Path: T:\ES\GIS\FINAL_EXHIBITS\Geologic_Investigation\6_CEFs.mxd Page 70 of 80 Attachment 3 Soil Description Page 71 of 80Map Unit Description: Brackett-Rock outcrop complex, 1 to 12 percent slopes---Travis County, Texas Travis County, Texas BlD—Brackett-Rock outcrop complex, 1 to 12 percent slopes Map Unit Setting National map unit symbol: 2yltz Elevation: 820 to 1,330 feet Mean annual precipitation: 33 to 37 inches Mean annual air temperature: 65 to 69 degrees F Frost-free period: 220 to 260 days Farmland classification: Not prime farmland Map Unit Composition Brackett and similar soils: 68 percent Rock outcrop: 20 percent Minor components: 12 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Brackett Setting Landform: Ridges Landform position (two-dimensional): Backslope, shoulder Landform position (three-dimensional): Side slope Down-slope shape: Convex Across-slope shape: Convex Parent material: Residuum weathered from limestone Typical profile A - 0 to 6 inches: gravelly clay loam Bw - 6 to 18 inches: clay loam Cr - 18 to 60 inches: bedrock Properties and qualities Slope: 1 to 12 percent Depth to restrictive feature: 10 to 20 inches to paralithic bedrock Drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.06 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 90 percent Gypsum, maximum content: 5 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water capacity: Very low (about 2.4 inches) Interpretive groups Land capability classification (irrigated): None specified Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 11/9/2020 Page 1 of 3 Page 72 of 80Map Unit Description: Brackett-Rock outcrop complex, 1 to 12 percent slopes---Travis County, Texas Land capability classification (nonirrigated): 6e Hydrologic Soil Group: D Ecological site: R081CY355TX - Adobe 29-35 PZ Hydric soil rating: No Description of Rock Outcrop Setting Landform: Ridges Landform position (two-dimensional): Shoulder Landform position (three-dimensional): Interfluve Down-slope shape: Convex Across-slope shape: Convex Parent material: Limestone Typical profile R - 0 to 48 inches: bedrock Properties and qualities Slope: 3 to 12 percent Depth to restrictive feature: 0 to 2 inches to lithic bedrock Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.06 to 1.98 in/hr) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 8 Hydrologic Soil Group: D Hydric soil rating: No Minor Components Eckrant Percent of map unit: 4 percent Landform: Ridges Landform position (two-dimensional): Backslope, shoulder Landform position (three-dimensional): Side slope Down-slope shape: Linear Across-slope shape: Convex Ecological site: R081CY363TX - Steep Rocky 29-35 PZ Hydric soil rating: No San saba Percent of map unit: 4 percent Landform: Ridges Landform position (two-dimensional): Footslope, toeslope Landform position (three-dimensional): Base slope Down-slope shape: Linear Across-slope shape: Concave Ecological site: R081CY356TX - Blackland 29-35 PZ Hydric soil rating: No Volente Percent of map unit: 4 percent Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 11/9/2020 Page 2 of 3 Page 73 of 80Map Unit Description: Brackett-Rock outcrop complex, 1 to 12 percent slopes---Travis County, Texas Landform: Ridges Landform position (two-dimensional): Footslope Landform position (three-dimensional): Base slope Down-slope shape: Linear Across-slope shape: Concave Ecological site: R081CY357TX - Clay Loam 29-35 PZ Hydric soil rating: No Data Source Information Soil Survey Area: Travis County, Texas Survey Area Data: Version 22, Jun 11, 2020 Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 11/9/2020 Page 3 of 3 Page 74 of 80 Attachment 4 References Page 75 of 80City of Austin. Property Profile A Development Services Tool. https://www.austintexas.gov/GIS/PropertyProfile/ Accessed 11-9-2020 City of Austin, 2020. Environmental Criteria Manual. Municipal Code 1.10.0 – 1.10.7 Rodda P.U., Garner, L.E. Dawe G.L., 1970. Geologic Quadrangle Map No. 88 Austin West, Travis County, Texas. Bureau of Economic Geology – The University of Texas at Austin Soil Survey Staff, Natural Resources Conservation Service, United States Department of Agriculture. Web Soil Survey. Available online at the following link: http://websoilsurvey.sc.egov.usda.gov/. Accessed 11-9-2020. Page 76 of 80 EXHIBIT 10 BCCP HABITAT MITIGATION Environmental Documents | COA Fire and EMS Station Davenport Village Page 77 of 80 May 21, 2021 Sara Gill Garza EMC 7708 Rialto Blvd. Ste. 125 Austin, TX 78735 Re: COA Fire and EMS Station- Davenport Village Dear Ms. Gill: Thank you for your application regarding the proposed City of Austin Davenport Village Fire and EMS Station. The site location provided on the Balcones Canyonlands Conservation Plan (BCCP) Participation Certificate Application is as follows: 6500 St. Stephens School Road. The project site lies outside the preserve acquisition boundary for the Balcones Canyonlands Preserve. Based upon a review of the project plans submitted with the application, this project is eligible to participate in the regional Balcones Canyonlands Section 10 (a) permit. Participation under the BCCP permit will cover incidental take of endangered species habitat, particularly Golden-cheeked Warbler habitat and karst species habitat that the project might impact. This application and habitat mitigation determination covers the proposed City of Austin Davenport Village Fire and EMS Station. This site will be 1.6 acres out of a 245.89 acre tract (Tax Parcel ID# 0126270509) as indicated on maps provided. The proposed land use will include a new City of Austin Fire Station consisting of a 12,525 sq. ft. fire station building, associated parking lot, site utilities, drainage, and landscape and hardscape improvements. Based on BCCP Habitat Zone Maps and maps submitted with the application, the 1.6 acres to be developed occurs in BCCP Golden-cheeked Warbler Habitat Mitigation Zone 2, outside of the preserve acquisition boundary. Because this is a City of Austin project, mitigation needs are provided from the mitigation bank balance maintained by the City of Austin. All mitigation acreages are rounded up to the next 0.1 acre increment under calculation procedures approved by the Balcones Canyonlands Coordinating Committee. Thus, a deduction of 1.6 acres of habitat mitigation will be made to the COA balance for the proposed project. As stated, construction activities will occur within areas designated as Golden-cheeked Warbler habitat. When participating under the BCCP permit, there are important requirements that relate to site clearing and subsequent construction activity that must be observed. Clearing of woody Page 78 of 80vegetation should be completed during the months from September through February. After March 1, such vegetation work must cease since Golden-cheeked Warblers will have returned to the area to nest. Construction may proceed beyond the March 1 deadline once the natural vegetation has been removed, and in accordance with USFWS protocol. There is also the potential to spread Oak Wilt with the clearing or pruning of Live Oaks and Red Oaks. Therefore it will be necessary to strictly adhere to the City of Austin’s Oak Wilt Prevention Policy. Please ensure all personnel on site adhere to this policy. Please keep a copy of this letter at the project site. If you have any further questions regarding this assessment or encounter any problems, please feel free to call me at (512) 972-1686. Kind Regards, Kimberlee C. Harvey BCCP Coordinating Committee Secretary cc: File #: 21-011 Amanda Wood, Travis County BCCP Coordinator Tanya Sommer, Consultations Branch Chief, USFWS David Gimnich, BCCP Infrastructure Coordinator Page 79 of 80T A B L E O F C O N T E N T S 7708 Rialto Blvd. | Suite 125 Austin, TX. 78735 p: (512) 298-3284 | e: info@garzaemc.com Presented by: Page 80 of 80