20240604-004: SP-2022-0531D (Walnut Creek - January Dr Flood Risk Reduction) Staff Report reduced — original pdf

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ZONING AND PLATTING COMMISSION ENVIRONMENTAL VARIANCE REVIEW SHEET SP-2022-0531D CASE NUMBER: PROJECT NAME: Walnut Creek - January Dr Flood Risk Reduction ADDRESS OF SITE: 11505 ½ January Drive NEIGHBORHOOD PLANNING AREA: NA WATERSHED: Walnut Creek JURISDICTION: Austin Full Purpose ZAP HEARING DATE: June 4, 2024 COUNCIL DISTRICT: 1 APPLICANT/ OWNER: AGENT: City of Austin Watershed Protection Department Rebeka McKay Isaac Chavez (512) 974-3353 Capital Delivery Services Department Claudia Corsetti, Project Management Division Xiaoqin Zhang, Engineering Services Division (512) 974-7205 Meg.greenfield@austintexas.gov (512) 978-4663 CASE MANAGER: Meg Greenfield PROPOSED DEVELOPMENT: The project proposes to install approximately 1,700 linear feet of storm lines to replace approximately 2,000 linear feet of aging storm lines within residential drainage easements. There will be no increase in impervious cover for post-development conditions. The existing Walnut Creek outfall will be modified by adding foundation or wingwall thickness for stability and energy dissipators to minimize the flooding of downstream properties. The applicant is requesting a variance from LDC 25-8-281 to allow construction within a Seep/Spring Complex Critical Environmental Feature buffer for the drainage outfall. The variance was approved with the following conditions by the Environmental Commission on May 15, 2024: 1. Repair erosion throughout area. 2. Place Grow Zone Signs at 100 ft intervals, 30 ft from curb. 3. Expand native planting and seeding throughout the Grow Zone and the curb (no plantings outside of the Grow Zone; sod area for stabilization can remain.) 4. Ensure that placement of topsoil, temp irrigation and weed management are included with the restoration. 5. Remove remaining driveway aprons and replace with curb and gutter.  SUMMARY STAFF RECOMMENDATION: Staff recommends approval of these requests with the Environmental Commission conditions. SUMMARY COMPONENTS OF SITE PLAN: All reviewers have approved the site plan except for AW Pipeline Engineering. PROJECT INFORMATION SITE AREA EXISTING ZONING FLOOR-AREA RATIO BUILDING COVERAGE IMPERVIOUS COVERAGE PARKING EXISTING ZONING AND LAND USES 118,329 sq. ft. ROW Allowed NA NA NA NA Proposed NA NA NA NA ZONING LAND USES Right-of-Way Width 60 feet Pavement Width Classification Approx. 37 feet Local Mobility ROW SF-2 SF-2 SF-2 SF-2 Site North South East West ABUTTING STREETS Street ROW Single Family Single Family Single Family Single Family January Dr NEIGHBORHOOD ORGANIZATIONS: Austin Independent School District Austin Lost and Found Pets Austin Neighborhoods Council Friends of Austin Neighborhoods Homeless Neighborhood Association Neighborhood Empowerment Foundation North Growth Corridor Alliance Northeast Walnut Creek Neighborhood Assn. SELTexas Sierra Club Austin Regional Group TechRidge Neighbors Yager Community  City of Austin Capital Delivery Services Engineering Services Division 505 Barton Springs Rd, Suite 900, Austin, Texas 78704 Meg Greenfield (Case Manager) and Review Team Development Services Division, Permitting Development Center Xiaoqin Zhang, P.E., Engineering Services Division Capital Delivery Services Department February 13, 2024 To: From: Date: Subject: Walnut Creek - January Dr Flood Risk Reduction (SP-2022-0531D) This document serves as Engineer’s Summary Report for Site Plan (D) Permit application for the utility construction of proposed storm system at January Dr from August Dr to February Dr. The summary outlines the following background information, proposed improvements and permitting requirements. Background Information Situated in the Walnut Creek Watershed, a portion of the site falls within FEMA and City of Austin fully developed 100-year floodplain near the intersection of January Dr and February Dr. Previous single-family lots (11601 to 11605 February Dr) were demolished due to flooding are now within City of Austin publicly-owned land. There are approximately 14 heritage trees inside the 2.72-acre limits of construction (LOC). The largest heritage tree, 34.5” live oak, is located behind February Dr at the intersection with January Dr (refer to Attachment A On-site Pre- development Consultation at 11605 February Dr on March 18, 2022 and Attachment B Dead Diseased Imminent Hazard Report). The pre-developed impervious cover within the LOC is 1.29 acres. Preliminary site investigations with Watershed Protection Department (WPD) identified Critical Environmental Features (CEFs), including a seep horizon and Canyon rimrocks, located within 50 feet from an existing outfall at Walnut Creek (see January Dr Rimrock/Seep Horizon and Limits of Construction Map in the end of this Report Attachment –Section 01010 Summary of Work as part of the bidding and construction documents). Proposed Stormwater Improvements The project proposes to install approximately 1,700 linear feet storm lines (ranging from 18” to 48” RCP) to replace approximately 2,000 linear feet of aging storm lines within residential drainage easements (see an exhibit January Dr Existing Storm Drain Pipe/SSMH to be Abandoned in the end of this report). There will be no increase in impervious cover for post- development conditions with this utility construction project via trench method. The existing Walnut Creek outfall will be modified by adding foundation or wingwall thickness for stability and energy dissipators to minimize environmental effects to the downstream of Walnut Creek properties. WPD Project Design and Delivery provided hydrologic and hydraulic studies for the entire contributing drainage basins from an upstream detention pond to the downstream existing outfall at Walnut Creek (see attached 20230728_January_model to ESD.zip).  5789.122 January Dr Flood Risk Reduction Page 2 Balancing Cut and Fill within Floodplain In response to early community input, a wildflower meadow is proposed for the demolished single-family houses behind February Drive. Minor grading will be required for topsoil management and landscaping elements to enhance erosion hazard protection. The net cut or fill quantity will be maintained at zero, aligning with the floodplain reviewer’s request to prevent negative impacts on the floodplain. In summer 2023, curbing on February Dr driveway was restored by an IDIQ contract, which redirected stormwater to existing curb inlets rather than sheet flow from February Dr to Walnut Creek. Environmental Variance and Drainage/Utility Criteria Manual Waivers As commented by WPD hydrogeologist, finding of facts listed in LDC 25-8-41(A) for Land Use Commission variance must be submitted to allow construction within the 50’ CEF setback (see Attachment F for a draft Variance Application Form). WPD granted an Environmental Resources Inventory (ERI) waiver request (ECM 1.3.2) on September 2, 2022 (see Attachment G for January Dr ERI Waiver Approval), and a stormwater vertical clearance waiver approval (DCM 5.7.1.G) for storm lateral “F” on August 9, 2023 (see Attachment H email date 08/16/2023). Austin Water has agreed to sign or stamp an equivalent vertical clearance waiver request (UCM 2.9.1.B.3) once the plans are approved in AB+C portal (see Attachment H email dated 01/30/2024). Furthermore, the existing paved area to be disturbed will be restored and paved in accordance with City of Ausitn paving standards. The construction is expected to commence by the end of 2024 following the bid/award process. If you have any questions or concerns, please contact us at (512) 974-3562. Thank you for your consideration on this Site Development Permit formal application. Attachment – Section 01010 Summary of Work Xc: https://cityofaustin.sharepoint.com/teams/CDS-ESD-Team4/Data/Projects/WPD_January_Storm_Sewer_Improvements/1- Design/Permit/U1 MCR Response/Docs/Attachment_C_Engineer's_Summary_Report.doc CIP ID # 5789.122 Division 1 General Requirements SUMMARY OF WORK Section 01010 PART 1 - GENERAL 1.1 RELATED DOCUMENTS Drawings and general provisions of Contract, including General Conditions, Section 00700, and Supplemental General Conditions, Section 00810, and Division 1 requirements. 1.2 DESCRIPTION OF WORK The Work of this Contract comprises the construction of approximately 1,700 LF proposed storm drain improvements as shown in construction drawings. The project is located in the vicinity of January Drive (from August Drive to February Drive). Other work includes but is not limited to: Walnut Creek streambank erosion protection, existing outfall modifications, abandonment in place of approximately 2,000 LF existing storm pipes with controlled low strength material (CLSM), removal of 60 LF of Asbestos Cement existing water pipe segments, soil management and grading, wildflower meadow and landscaping, etc. In addition, the existing paved area to be disturbed within the limits of construction will be repaved in accordance with City of Austin paving standards. The Work of this Contract includes sustainability requirements as shown in the Division 1 Section 01352 and/or 01505 and all other applicable specification sections. It is the intent of the Owner to work with the Contractor to implement sustainable construction practices to the greatest extent possible. 1.21 Scope of Work A. This section describes the Project in general and provides an overview of the extent of the Work to be performed by the CONTRACTOR. Detailed requirements and extent of Work is stated in the applicable Specification Sections and shown on the Drawings. CONTRACTOR shall, except as otherwise specifically stated herein or in any applicable part of these Contract Documents, provide and pay for all lablor, materials, equipment, tools, construction equipment, and other facilities and services necessary for proper execution, testing, and completion of the Work. B. Any part or item of the Work which is reasonably implied or normally required to make the installation satisfactorily operable shall be perfomed by the CONTRACTOR and the expense thereof shall be included in the applicable unit prices or lump sum prices bid for the Work. It is the intent of these Specifications to provide the OWNER with the complete system. All miscellaneous appurtenances and other items of Work that are incidental to meeting the prices or lump sum prices bid for the Work even though these appurtenances and items may not be specifically called for in the Bid Documents. C. The Work of this Contract comprises the construction of approximately 1,700 LF proposed storm drain improvements as shown in construction drawings. The project is located in the vicinity of January Drive (from August Drive to February Drive). Other work includes but is not limited to: Walnut Creek streambank erosion protection, existing outfall modifications, abandonment in place of approximately 2,000 LF existing storm pipes with controlled low strength material (CLSM), removal of 60 LF of Asbestos Cement existing water pipe segments, soil management and grading, wildflower meadow and landscaping, etc. In addition, the existing paved area to be disturbed within the limits of construction will be repaved in accordance with City of Austin paving standards. Rev. Date 08/28/2020 Summary of Work / 01010 Page 1 of 5 Division 1 General Requirements 1.22 Location of Project A. Street Locations: 11502-11614 January Drive 1.23 Contractor's Responsibilities A. Execute all Work, including excavation, installing pipe, backfill, miscellaneous concrete and testing. The Work of this Contract is specified in the City of Austin Standard Specifications, Special Provisions and Special Specifications listed in the Table of Contents. B. Secure all construction-related permits, other than those provided by OWNER as described in paragraph 6.6 of Section 00810, Supplemental General Conditions, and pay for the same. C. Arrange for the necessary temporary water and electric service and pay for these services and all water and electricity consumed during the construction Work. D. Provide adequate temporary sanitary facilities. 1.24 Easements and Rights-Of-Way CONTRACTOR shall confine his construction operations within the limits indicated on the Drawings, and shall use due care in placing construction tools, equipment, excavated materials, and pipeline materials and supplies so as to cause the least possible damage to property and interference with traffic. If the CONTRACTOR requires additional easement for his operations, the CONTRACTOR is solely responsible for acquisition and maintenance of the easement. No additional compensation will be provided by the OWNER. A. Easements - Easements across private property are indicated on the Drawings. CONTRACTOR shall set stakes to mark the boundaries of construction easement across private property. The stakes shall be protected and maintained until completion of construction and cleanup. B. Rights-of-Way - Permits for Work in rights-of-way shall be obtained by the CONTRACTOR. All Work performed and all operations of CONTRACTOR, his employees, or subcontractors, within the limits of railroad and highway rights-of-way, shall be in conformity with the requirements and be under the control (through OWNER) of the railroad or highway authority owning, or having jurisdiction over and control of, the right-of-way in each case. 1.25 Operation of Existing Facilities Existing water and wastewater facilities shall be kept in continuous operation throughout the construction period. No interruption will be permitted which adversely affects the degree of service provided. Provided permission is obtained from OWNER in advance, portions of the existing facilities may be taken out of service for short periods corresponding with periods of minimum service demands. CONTRACTOR shall provide temporary facilities and make temporary modifications as necessary to keep the existing facilities in operation during the construction period. 1.26 Connections to Existing Facilities Unless otherwise specified or indicated, CONTRACTOR shall make all necessary connections to existing facilities including structures, drain lines, and utilities. In each case, CONTRACTOR Rev. Date 08/28/2020 Summary of Work / 01010 Page 2 of 5 Division 1 General Requirements shall receive permission from OWNER or the owning utility prior to undertaking connections. CONTRACTOR shall protect facilities against deleterious substances and damage. Connections to existing facilities which are in service shall be thoroughly planned in advance, and all required equipment, materials and labor shall be on hand at the time of undertaking the connection. Work shall proceed continuously (around the clock) if necessary to complete connections in the minimum time. Operation of valves or other appurtenances on existing utilities, when required, shall be by or under the direct supervision of the owning utility. 1.27 Unfavorable Construction Conditions No portion of the Work shall be constructed under conditions which adversely affect the quality or efficiency thereof, unless special means or precautions are taken by CONTRACTOR to perform the Work in a proper and satisfactory manner. 1.3 SUBMITTALS Provide shop drawings and other information as required by Section 01300 for coordination of the work. 1.4 CONTRACTOR'S USE OF CONSTRUCTION SITE The construction site will be in use by public throughout the duration of contract. The CONTRACTOR shall refer to Section 01040, Project Coordination for coordination required to minimize disturbance and hazards to pedestrian as well as automobile traffic. CONTRACTOR shall not unreasonably encumber the construction site with materials or equipment. CONTRACTOR shall assume reasonable responsibility for protection of construction site. 1.5 CONSTRUCTION SEQUENCING* 1. The sequence and progress of work shall minimize the length of time any excavation is left open. Construction shall take place in accordance with the traffic control phasing plan. All work within a phase must be completed prior to beginning work in another phase. Trenches left open overnight shall be properly secured with Jersey Barrier, chain link fencing, and other means necessary. Construction work time is limited to 8:00AM to 5:00PM weekdays, using daily lane closures. 2. 3. 4. 5. Any work indicated in the contract drawings or contract document without a bid item shall be completed by the contractor as incidental to the contract. Contractor shall notify the Planning and Development Review Department at 974- 6330 and -2922 at least twenty-four (24) hours prior to the installation of any drainage facility within a drainage easement or street right-of-way. Contractor is to comply with City of Austin Parks and Recreation Department's policy regarding the prevention of the spread of oak wilt. Pursuant to 15-12-131 of the Austin City Code, the contractor may not block, direct, impede, or reroute pedestrian and/or vehicular traffic, nor place a barricade or other traffic control device in a right-of-way, without first obtaining a "Temporary Use Right- of-Way Permit" from R.O.W. Management. obtaining a "Temporary Use Right-of-Way Permit" from R.O.W. Management. Rev. Date 08/28/2020 Summary of Work / 01010 Page 3 of 5  6. Division 1 General Requirements is responsible Contractor for proper protection of any and all existing buildings/structures adjacent to the work covered in these contract documents thru the duration of all work related activities. The contractor shall submit a detailed schedule of construction which complies with the following sequence: 6.1. Install temporary erosion and sedimentation controls. tree protection measures, and C.I.P. signs immediately prior to construction. 6.2. Hold on-site pre-construction meeting with the environmental inspector and the construction inspector. 6.3. Begin construction of project as follows; A. Place traffic control devices (See traffic control sheets) B. Material (Pipe, fittings and bedding material, etc.) C. Excavation (Comply with OSHA and codes etc. ) D. Pipe laying and testing (Comply with specifications) E. Backfill (Comply with specifications)** 6.4. Commence restoration and re-vegetation of disturbed areas as early as feasible and necessary for timely completion of the project. Re-vegetation of disturbed areas constitutes the " permanent erosion and sedimentation controls" for this project. 6.5. Remove all temporary erosion and sedimentation controls upon completion of all construction items and permanent erosion and sedimentation controls. 6.6. Dress up and restore any disturbed areas to pre construction existing condition or better. Remove traffic control. 7. 8. Notes: After construction is complete and the site is completely stabilized, filter dikes and any remaining silt shall be removed. Silt shall be disposed of in the designated spoil disposal site. * The existing site contains critical environmental features including rimrock and seep horizon/spring as shown in the ATTACHMENT of this 01010 section. **After new pipe laying, testing and backfill at January Drive and tie-in at Walnut Creek outfall, contractor shall field verify existing storm drain pipes to be abandoned as shown in the ATTACHMENT including approximately 2,000 LF existing 24”-27” storm pipes (between SSMH# 2124098 and SSMH#150009) and three storm sewer manholes (SSMH#2124098, SSMH#2124104, and SSMH#1215395). All curb inlets at existing January Drive, February Drive, March Drive or April Drive shall remain active in place. Pay item SP402S-A (Controlled Low Strength Material for Utility Crossings and Abandonment of Existing Storm Pipes and Structures) is intended for abandonment of existing storm pipes with CLSM placed at existing storm system vertical depths other than CLSM used for utility crossings. *** Caping the existing infrastructure should occur once the system is in place so that interim flows will continue to have existing storm system to drain. END Rev. Date 08/28/2020 Summary of Work / 01010 Page 4 of 5 Division 1 General Requirements ATTACHMENT JANUARY DR RIMROCK/SEEP HORIZON AND LIMITS OF CONSTRUCTION MAP JANUARY DR EXISTING STORM DRAIN PIPE/SSMH TO BE ABANDONED (11502 – 11613 January Dr.) Rev. Date 08/28/2020 Summary of Work / 01010 Page 5 of 5 McKay, Rebeka Wednesday, August 16, 2023 10:26 AM Zhang, Xiaoqin; Chavez, Isaac; Middleton, John; Corsetti, Claudia Garcia, Carlos; Zerda, Joseph FW: January Drive - UCM and DCM Waiver Request From: Sent: To: Cc: Subject: See the email from Joseph Zerda below. The vertical clearance waiver is approved by WPD, use the date of the email for the DCM waiver notes. Thanks, Rebeka L. McKay, P.E., CFM Supervising Engineer – Floodplain Office and Modeling City of Austin | Watershed Protection Department Office: (512) 974-3353 www.austintexas.gov/watershed From: Zerda, Joseph <Joseph.Zerda@austintexas.gov> Sent: Wednesday, August 16, 2023 10:05 AM To: McKay, Rebeka <Rebeka.McKay@austintexas.gov> Subject: RE: January Drive - UCM and DCM Waiver Request Hello Rebeka, I reviewed the waivers presented for the January Dr FRR Project for vertical clearance presented on Sheet 12, for Storm Line F, STA 1+91 and 1+12 are approved. Thank you, Joseph From: McKay, Rebeka <Rebeka.McKay@austintexas.gov> Sent: Wednesday, August 16, 2023 9:46 AM To: Zerda, Joseph <Joseph.Zerda@austintexas.gov> Subject: FW: January Drive - UCM and DCM Waiver Request From: Zhang, Xiaoqin <Xiaoqin.Zhang@austintexas.gov> Sent: Wednesday, August 09, 2023 5:12 PM To: McKay, Rebeka <Rebeka.McKay@austintexas.gov>; Torres, Alfredo <Alfredo.Torres@austintexas.gov>; Chavez, Isaac <Isaac.Chavez@austintexas.gov>; Corsetti, Claudia <Claudia.Corsetti@austintexas.gov> Cc: Garcia, Carlos <Carlos.Garcia@austintexas.gov>; Chapa, Roverto <Roverto.Chapa@austintexas.gov>; Rodriguez, Tony <Tony.Rodriguez@austintexas.gov>; Middleton, John <John.Middleton@austintexas.gov>; Zerda, Joseph <Joseph.Zerda@austintexas.gov> Subject: RE: January Drive - UCM and DCM Waiver Request WPD_WCJanDr Folder: UCM_DCM_Waiver Walnut Creek – January Dr Flood Risk Reduction - see attached waiver request cover letter and attached sheets in the above shared folder. Let us know if there are additional information needed from AW/WPD or access issues at the earliest convenience. Thank you Xiaoqin Zhang, P.E. City of AusIn Capital Delivery Services (CDS) Engineering Services Division 505 Barton Springs Road Office Phone (512) 974-3562 xiaoqin.zhang@ausIntexas.gov From: Zhang, Xiaoqin Sent: Friday, August 4, 2023 4:16 PM To: McKay, Rebeka <Rebeka.McKay@austintexas.gov>; Torres, Alfredo <Alfredo.Torres@austintexas.gov>; Chavez, Isaac <Isaac.Chavez@austintexas.gov>; Corsetti, Claudia <Claudia.Corsetti@austintexas.gov> Cc: Garcia, Carlos <Carlos.Garcia@austintexas.gov>; Chapa, Roverto <Roverto.Chapa@austintexas.gov>; Middleton, John <John.Middleton@austintexas.gov>; Zerda, Joseph <Joseph.Zerda@austintexas.gov> Subject: RE: January Drive Updated Model for U0 WPD_WCJanDr Folder: UCM_DCM_Waiver File name: January Dr_UCM_DCM_Waiver_Request 2023-08-04.pdf UCM waiver: sheet 2 (bottom AW waiver approval table) and SHT. 12 for SSL “F” with vertical clearance +10” as discussed today. DCM waiver: Cover sheet and SHT. 12. Thanks in advance, Xiaoqin Zhang, P.E. City of AusIn Capital Delivery Services (CDS) Engineering Services Division 505 Barton Springs Road Office Phone (512) 974-3562 xiaoqin.zhang@ausIntexas.gov From: Zhang, Xiaoqin Sent: Monday, July 31, 2023 9:06 AM To: Chavez, Isaac <Isaac.Chavez@austintexas.gov>; McKay, Rebeka <Rebeka.McKay@austintexas.gov>; Torres, Alfredo <Alfredo.Torres@austintexas.gov> Cc: Garcia, Carlos <Carlos.Garcia@austintexas.gov>; Corsetti, Claudia <Claudia.Corsetti@austintexas.gov> Subject: FW: January Drive Updated Model for U0 https://teams.microsoft.com/l/meetup- join/19%3ameeting_MDc5YWI3Y2UtZmEyZS00MGEyLThlNWEtZjg5ZDA1ZWE1MDI2%40thread.v2/0?con text=%7b%22Tid%22%3a%225c5e19f6-a6ab-4b45-b1d0- be4608a9a67f%22%2c%22Oid%22%3a%223e4641a3-f95b-4715-a869-320cb3eaabda%22%7d 08/01/2023 Teams meeting (Tuesday 2:30 – 3:30 pm). Feel free to join the meeting for about half an hour to discuss UCM/ DCM compliance for January Dr Flood Risk Reduction Thank you Xiaoqin Zhang, P.E. City of AusIn Capital Delivery Services (CDS) Engineering Services Division 505 Barton Springs Road Office Phone (512) 974-3562 xiaoqin.zhang@ausIntexas.gov From: Chavez, Isaac <Isaac.Chavez@austintexas.gov> Sent: Friday, July 28, 2023 6:52 PM To: Zhang, Xiaoqin <Xiaoqin.Zhang@austintexas.gov> Cc: Corsetti, Claudia <Claudia.Corsetti@austintexas.gov>; Middleton, John <John.Middleton@austintexas.gov>; McKay, Rebeka <Rebeka.McKay@austintexas.gov>; Garcia, Carlos <Carlos.Garcia@austintexas.gov> Subject: January Drive Updated Model for U0 Good Evening, Please see the attached updated model for the January drive project. This model demonstrates compliance with DCM 5.3.2 and 5.7.1. We will need to discuss 5.7.1 compliance for lateral F (see below). I could not find a design alternative that will meet DCM criteria for both utility crossings pictured below. Our options forward are as follows. a.) Obtain a waivers for vertical clearances, with potentially needing to encase the utilities per AW request. b.) Propose a vertical bend in the water utility (upstream crossing in the profile below) to relocate the water below the storm pipe, and shift the entire lateral move up to allow for clearance. Please keep in mind that for crossings at a depth greater than 6', a 2' vertical clearance below is required. Please let me know your soonest availability to meet to discuss.  Best, Isaac Chavez, PE Project Design and Delivery | Watershed Protection Department 505 Barton Springs Rd | 12th floor | Austin, TX 78704 Direct | 512.974.2349 Pronouns | He | Him | His https://austintexas.gov/department/watershed-protection From: Sent: To: Cc: Subject: Sounds good, thank you. Cramer, MaryAnn Tuesday, January 30, 2024 3:35 PM Zhang, Xiaoqin; Chapa, Roverto Garcia, Carlos; Perez, Javier; Chavez, Isaac; McKay, Rebeka; Corsetti, Claudia; Middleton, John RE: January Drive - UCM Waiver Request Mary Ann C. Cramer Utility Land Development Project Coordinator Austin Water | City of Austin Office: 512-972-2118 Along with the larger community, many Austin Water staff will be taking time to celebrate the season which may impact availability in the final days of the year. Visiting with your project coordinator (AW Reviewer) to schedule any project related consultations prior to December 20th is recommended. From: Zhang, Xiaoqin <Xiaoqin.Zhang@austintexas.gov> Sent: Tuesday, January 30, 2024 3:31 PM To: Cramer, MaryAnn <MaryAnn.Cramer@austintexas.gov>; Chapa, Roverto <Roverto.Chapa@austintexas.gov> Cc: Garcia, Carlos <Carlos.Garcia@austintexas.gov>; Perez, Javier <Javier.Perez@austintexas.gov>; Chavez, Isaac <Isaac.Chavez@austintexas.gov>; McKay, Rebeka <Rebeka.McKay@austintexas.gov>; Corsetti, Claudia <Claudia.Corsetti@austintexas.gov>; Middleton, John <John.Middleton@austintexas.gov> Subject: RE: January Drive - UCM Waiver Request Thanks for the confirmation – the plans will be resent for signature or stamp once approved in AB+C portal. Xiaoqin Zhang, P.E. City of AusCn Capital Delivery Services (CDS) Engineering Services Division 505 Barton Springs Road Office Phone (512) 974-3562 xiaoqin.zhang@ausCntexas.gov From: Cramer, MaryAnn <MaryAnn.Cramer@austintexas.gov> Sent: Tuesday, January 30, 2024 3:11 PM To: Zhang, Xiaoqin <Xiaoqin.Zhang@austintexas.gov>; Chapa, Roverto <Roverto.Chapa@austintexas.gov> Cc: Garcia, Carlos <Carlos.Garcia@austintexas.gov> Subject: RE: January Drive - UCM Waiver Request  Xiaoqin – Waivers are signed at the time the plans are signed by AW. As of 11/27/23, the plans were rejected. Thank you! Mary Ann C. Cramer Utility Land Development Project Coordinator Austin Water | City of Austin Office: 512-972-2118 Along with the larger community, many Austin Water staff will be taking time to celebrate the season which may impact availability in the final days of the year. Visiting with your project coordinator (AW Reviewer) to schedule any project related consultations prior to December 20th is recommended. From: Zhang, Xiaoqin <Xiaoqin.Zhang@austintexas.gov> Sent: Tuesday, January 30, 2024 10:00 AM To: Cramer, MaryAnn <MaryAnn.Cramer@austintexas.gov>; Chapa, Roverto <Roverto.Chapa@austintexas.gov> Cc: Garcia, Carlos <Carlos.Garcia@austintexas.gov> Subject: FW: January Drive - UCM Waiver Request Just to note – since this project is sponsored by WPD, all P&P sheets are for proposed storm pipes. Therefore, no stamps are needed for all P&P sheets except on SSL “F”. If agreeable, sign and return AW waiver request at the bottom of Sheet 4 and stamp SSL”F” by end of January 2024. Thank you Xiaoqin Zhang, P.E. City of AusCn Capital Delivery Services (CDS) Engineering Services Division 505 Barton Springs Road Office Phone (512) 974-3562 xiaoqin.zhang@ausCntexas.gov From: Zhang, Xiaoqin Sent: Monday, January 29, 2024 4:59 PM To: Cramer, MaryAnn <MaryAnn.Cramer@austintexas.gov>; Chapa, Roverto <Roverto.Chapa@austintexas.gov> Cc: Garcia, Carlos <Carlos.Garcia@austintexas.gov>; Perez, Javier <Javier.Perez@austintexas.gov> Subject: FW: January Drive - UCM Waiver Request Good afternoon, As discussed last week with AW on the following U1 MCR Response, SP-2022-0531D for January Dr Flood Risk Reduction updated P&P for SSL”F” and waiver request table are attached for AW U1 reviews. January Dr_012924_AW_set.pdf contains a complete AW P&P set (note: TCPs are not included in the AW set). SP-2022-0531D_Walnut Creek - January Dr Flood Risk Reduction_Review U1_Response.pdf If agreeable, sign and return AW waiver request at the bottom of Sheet 4 and stamp all P&P sheets by end of January 2024. Thank you Xiaoqin Zhang, P.E. City of AusCn Capital Delivery Services (CDS) Engineering Services Division 505 Barton Springs Road Office Phone (512) 974-3562 xiaoqin.zhang@ausCntexas.gov From: Torres, Alfredo <Alfredo.Torres@austintexas.gov> Sent: Wednesday, August 23, 2023 11:20 AM To: Zhang, Xiaoqin <Xiaoqin.Zhang@austintexas.gov>; McKay, Rebeka <Rebeka.McKay@austintexas.gov>; Chavez, Isaac <Isaac.Chavez@austintexas.gov>; Corsetti, Claudia <Claudia.Corsetti@austintexas.gov> Cc: Garcia, Carlos <Carlos.Garcia@austintexas.gov>; Chapa, Roverto <Roverto.Chapa@austintexas.gov>; Rodriguez, Tony <Tony.Rodriguez@austintexas.gov>; Middleton, John <John.Middleton@austintexas.gov>; Zerda, Joseph <Joseph.Zerda@austintexas.gov>; Perez, Javier <Javier.Perez@austintexas.gov> Subject: RE: January Drive - UCM and DCM Waiver Request Ms. Zhang, I believe Mr. Chapa is on board for the waivers requested. Once all AWP comments have been addressed and plans are ready for signatures, I will make sure Mr. Chapa signs off on the waivers. I will continue working with Mr. Perez to get your project across the finished line. Thank you, Alfredo Torres Pipeline Engineering City of Austin | Austin Water 6310 Wilhelmina Delco Drive, Suite # 3142.07 Austin, TX 78752 512-972-0238 | alfredo.torres@austintexas.gov Austin Water-Pipeline Engineering Webpage  From: Zhang, Xiaoqin <Xiaoqin.Zhang@austintexas.gov> Sent: Wednesday, August 09, 2023 5:12 PM To: McKay, Rebeka <Rebeka.McKay@austintexas.gov>; Torres, Alfredo <Alfredo.Torres@austintexas.gov>; Chavez, Isaac <Isaac.Chavez@austintexas.gov>; Corsetti, Claudia <Claudia.Corsetti@austintexas.gov> Cc: Garcia, Carlos <Carlos.Garcia@austintexas.gov>; Chapa, Roverto <Roverto.Chapa@austintexas.gov>; Rodriguez, Tony <Tony.Rodriguez@austintexas.gov>; Middleton, John <John.Middleton@austintexas.gov>; Zerda, Joseph <Joseph.Zerda@austintexas.gov> Subject: RE: January Drive - UCM and DCM Waiver Request WPD_WCJanDr Folder: UCM_DCM_Waiver Walnut Creek – January Dr Flood Risk Reduction - see attached waiver request cover letter and attached sheets in the above shared folder. Let us know if there are additional information needed from AW/WPD or access issues at the earliest convenience. Thank you Xiaoqin Zhang, P.E. City of AusCn Capital Delivery Services (CDS) Engineering Services Division 505 Barton Springs Road Office Phone (512) 974-3562 xiaoqin.zhang@ausCntexas.gov From: Zhang, Xiaoqin Sent: Friday, August 4, 2023 4:16 PM To: McKay, Rebeka <Rebeka.McKay@austintexas.gov>; Torres, Alfredo <Alfredo.Torres@austintexas.gov>; Chavez, Isaac <Isaac.Chavez@austintexas.gov>; Corsetti, Claudia <Claudia.Corsetti@austintexas.gov> Cc: Garcia, Carlos <Carlos.Garcia@austintexas.gov>; Chapa, Roverto <Roverto.Chapa@austintexas.gov>; Middleton, John <John.Middleton@austintexas.gov>; Zerda, Joseph <Joseph.Zerda@austintexas.gov> Subject: RE: January Drive Updated Model for U0 WPD_WCJanDr Folder: UCM_DCM_Waiver File name: January Dr_UCM_DCM_Waiver_Request 2023-08-04.pdf UCM waiver: sheet 2 (bottom AW waiver approval table) and SHT. 12 for SSL “F” with vertical clearance +10” as discussed today. DCM waiver: Cover sheet and SHT. 12. Thanks in advance, Xiaoqin Zhang, P.E. City of AusCn Capital Delivery Services (CDS) Engineering Services Division 505 Barton Springs Road Office Phone (512) 974-3562 xiaoqin.zhang@ausCntexas.gov From: Zhang, Xiaoqin Sent: Monday, July 31, 2023 9:06 AM To: Chavez, Isaac <Isaac.Chavez@austintexas.gov>; McKay, Rebeka <Rebeka.McKay@austintexas.gov>; Torres, Alfredo <Alfredo.Torres@austintexas.gov> Cc: Garcia, Carlos <Carlos.Garcia@austintexas.gov>; Corsetti, Claudia <Claudia.Corsetti@austintexas.gov> Subject: FW: January Drive Updated Model for U0 https://teams.microsoft.com/l/meetup- join/19%3ameeting_MDc5YWI3Y2UtZmEyZS00MGEyLThlNWEtZjg5ZDA1ZWE1MDI2%40thread.v2/0?con text=%7b%22Tid%22%3a%225c5e19f6-a6ab-4b45-b1d0- be4608a9a67f%22%2c%22Oid%22%3a%223e4641a3-f95b-4715-a869-320cb3eaabda%22%7d 08/01/2023 Teams meeting (Tuesday 2:30 – 3:30 pm). Feel free to join the meeting for about half an hour to discuss UCM/ DCM compliance for January Dr Flood Risk Reduction Thank you Xiaoqin Zhang, P.E. City of AusCn Capital Delivery Services (CDS) Engineering Services Division 505 Barton Springs Road Office Phone (512) 974-3562 xiaoqin.zhang@ausCntexas.gov From: Chavez, Isaac <Isaac.Chavez@austintexas.gov> Sent: Friday, July 28, 2023 6:52 PM To: Zhang, Xiaoqin <Xiaoqin.Zhang@austintexas.gov> Cc: Corsetti, Claudia <Claudia.Corsetti@austintexas.gov>; Middleton, John <John.Middleton@austintexas.gov>; McKay, Rebeka <Rebeka.McKay@austintexas.gov>; Garcia, Carlos <Carlos.Garcia@austintexas.gov> Subject: January Drive Updated Model for U0 Good Evening,  Please see the attached updated model for the January drive project. This model demonstrates compliance with DCM 5.3.2 and 5.7.1. We will need to discuss 5.7.1 compliance for lateral F (see below). I could not find a design alternative that will meet DCM criteria for both utility crossings pictured below. Our options forward are as follows. a.) Obtain a waivers for vertical clearances, with potentially needing to encase the utilities per AW request. b.) Propose a vertical bend in the water utility (upstream crossing in the profile below) to relocate the water below the storm pipe, and shift the entire lateral move up to allow for clearance. Please keep in mind that for crossings at a depth greater than 6', a 2' vertical clearance below is required. Please let me know your soonest availability to meet to discuss. Best, Isaac Chavez, PE Project Design and Delivery | Watershed Protection Department 505 Barton Springs Rd | 12th floor | Austin, TX 78704 Direct | 512.974.2349 Pronouns | He | Him | His https://austintexas.gov/department/watershed-protection Dear Eric Brown, The Watershed Protection Department is seeking a variance from LDC 25-8-281 to construct a drainage outfall within a Seep/Spring Complex Critical Environmental Feature buffer. The January Drive Flood Risk Reduction project (CIP 5789.122) aims to mitigate the risk of flooding in the Four Season Subdivision Neighborhood located in North Austin. The proposed storm drain improvements will redirect runoff flows away from undersized infrastructure in the residential parcels and into the January Drive right-of-way. The construction of the storm drain system is necessary for the safety and well-being of the citizens of the City of Austin, as it will help relieve flooding in the neighborhood. The electronic format (PDF) of the Findings of Facts package consisting of the following: 1. Environmental Commission Variance Application Form 2. Walnut Creek - January Drive Project Map 3. Landscape and Grading Plan Sheets 4. ERI Waiver Approval Letter 5. ERI Location Map 6. ERI Topography Map Please do not hesitate to contact me if you have any questions or concerns. Sincerely, Claudia Corsetti, P.E., CFM, PMP Capital Delivery Project Manager Capital Delivery Service Department February 9, 2024 ENVIRONMENTAL COMMISSION VARIANCE APPLICATION FORM PROJECT DESCRIPTION Applicant Contact Information Name of Applicant Street Address City State ZIP Code Work Phone E-Mail Address Case Name Case Number Address or Location Environmental Reviewer Name Environmental Resource Management Reviewer Name Applicable Ordinance Claudia Corsetti, Capital Delivery Services Dept. 6800 Burleson Road, Building 312, Suite 200 Austin, TX 78744 512-974-7205 Claudia.corsetti@austintexas.gov 11603 February Drive, Austin, TX 78753 SP-2022-0531d Brad Jackson Eric Brown, Hydro Geologist Variance Case Information Walnut Creek - January Dr Flood Risk Reduction LDC 25-8-281 to allow construction within a Seep/Spring Complex Critical Environmental Feature buffer for a drainage outfall. Watershed Name Walnut Creek Watershed Classification Urban City of Austin | Environmental Commission Variance Application 1 February 9, 2024 Edwards Aquifer Recharge Zone Edwards Aquifer Contributing Zone Edwards Aquifer Contributing Zone Distance to Nearest Classified Waterway No Adjacent to the waterway. Water and Waste Water service to be provided by City of Austin The variance request is as follows (Cite code references: LDC 25-8-281 to allow construction within a Seep/Spring Complex CEF buffer Existing ________ ________ ________ Proposed _________ _________ ________ No change in impervious cover is proposed. The following general description is for the portion of the property where the tie-in of the proposed stormwater drainage improvements will be taking place directly behind the existing 6ft by 8ft outfall structure. The existing 30-inch RCP outfall connection will be replaced with a 48-inch RCP. The new upsized 48 - inch stormwater system will tie into an existing headwall to minimize the need to disrupt the seep horizon. Request Impervious cover square footage: acreage: percentage: Provide general description of the property (slope range, elevation range, summary of vegetation / trees, summary of the geology, CWQZ, WQTZ, CEFs, floodplain, heritage trees, any other notable or outstanding characteristics of the property) City of Austin | Environmental Commission Variance Application 2 Construction within a Seep/Spring Complex CEF buffer. February 9, 2024 Clearly indicate in what way the proposed project does not comply with current Code (include maps and exhibits) FINDINGS OF FACT Project: Ordinance: A. 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. 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. Yes Watershed Protection Department proposes a project to reduce the risk of flooding for the Four Season Subdivision Neighborhood. The new stormwater drainage system must be installed to direct stormwater flows away from existing properties and into the ROW. The development is necessary for the health and safety of the citizens of the City of Austin. The denial of the requested variance for the proposed project will preclude the construction of a stormwater facility necessary to relieve the neighborhood of flooding. The variance is being requested to allow for drainage improvements and continued maintenance and operation of the stormwater system. 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 3 February 9, 2024 The stormwater improvements are required to reduce the risk of flooding within the Four Season Subdivision Neighborhood. The new system alignment must be installed to direct stormwater runoff flows away from existing properties and into the ROW. The development is necessary for the health and safety of citizens of the City of Austin. The upsized stormwater system release at the existing facility outfall/headwall structure is to minimize impacts to the environment. Due to the environmentally sensitive features in the area, the location of the new upsized system tie-in will be directly behind the existing headwall to prevent disturbance of the seep horizon at Walnut Creek. Is the minimum deviation from the code requirement necessary to allow a reasonable use of the property; The proposed stormwater improvement will provide a safe and controlled method for directing stormwater runoff flows into Walnut Creek. Does not create a significant probability of harmful environmental consequences. Yes b) Yes c) Yes The proposed stormwater improvement will maintain the existing outfall structure and reduce the probability of harmful environmental consequences. Development with the variance will result in water quality that is at least equal to the water quality achievable without the variance. Yes The proposed stormwater improvement will redirect runoff flows away from residential structures, reducing the risk of flooding and becoming contaminated with household chemicals like cleaners, and auto/cooking oils. B. Additional Land Use Commission variance determinations for a requirement of Section 25-8-422 (Water Quality Transition Zone), Section 25-8-452 (Water Quality Transition Zone), Article 7, Division 1 (Critical Water Quality Zone Restrictions), or Section 25-8-368 (Restrictions on Development Impacting Lake Austin, Lady Bird Lake, and Lake Walter E. Long): The criteria for granting a variance in Subsection (A) are met; Yes The proposed stormwater improvement will provide a safe and controlled method for directing stormwater runoff flows into Walnut Creek. The requirement for which a variance is requested prevents a reasonable, economic use of the entire property; Yes The proposed stormwater improvement will tie in to the existing facility headwall structure to minimize impacts to the environment and make the best use of the entire property with a minimal increase to the storm drainage system’s footprint. City of Austin | Environmental Commission Variance Application 4 3. 1. 2. February 9, 2024 3. The variance is the minimum deviation from the code requirement necessary to allow a reasonable, economic use of the entire property. Yes The proposed stormwater improvement will tie-in to the existing facility headwall structure to minimize impacts to the environment and make the best use of the entire property with a minimal increase to the storm drainage system’s footprint. **Variance approval requires all above affirmative findings. City of Austin | Environmental Commission Variance Application 5 February 9, 2024 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 6 Exhibits for Commission Variance Aerial Photo of the Site Figure 1 - 2024 Aerial, 11603 February Dr City of Austin | Environmental Commission Variance Application 7 Exhibits for Commission Variance Site Photos Figure 2 - Existing Headwall Structure, View from Walnut Creek Figure 3 - Existing Headwall Structure, View from Top of Headwall City of Austin | Environmental Commission Variance Application 8 Exhibits for Commission Variance Figure 4 – Existing Headwall Structure, View from Top of Headwall to Walnut Creek Figure 5 – View of site near the street inlet, 11603 February Dr City of Austin | Environmental Commission Variance Application 9 Exhibits for Commission Variance Figure 6 - View of site upstream of headwall, 11603 February Dr City of Austin | Environmental Commission Variance Application 10 Exhibits for Commission Variance Aerial Photo of the Vicinity Figure 7 – 2024 Aerial of Project Vicinity, January Drive Flood Risk Reduction City of Austin | Environmental Commission Variance Application 11 RIVER O A KS Legend Proposed Storm Drain (SD) Existing SD to Remain Existing SD to Abandon Existing Inlet Creek Detention Pond COA 100-Year Floodplain " ! ! ! FY23 Drainage Reports Building Yard Street W ALN UT RID G E ! " " ! ! " " ! ! ! ! Y R A U N A J " " " ! " " " ! M A R C H A P R I L BLER TO " " " " W A L N U T C R E E K F E B R U A R Y 0 100 200 400 Feet ® A U G U S T The City of Austin is currently updating floodplain maps citywide. The floodplain shown on this map is used for regulating development only. For questions about the floodplain study in your area, visit ATXfloodplains.com. This product is for informational purposes and may not have been prepared for or be suitable for legal, engineering, or surveying purposes. It does not represent an on-the-ground survey and represents only the approximate relative location of property boundaries. This product has been produced by the WPD for the sole purpose of geographic reference. No warranty is made by the City of Austin regarding specific accuracy or completeness. S T U G U A Environmental Resource Inventory Waiver Request Form For The City of Austin Related to LDC 25-8-121(D) or City Code 30-5-121(D) GENERAL SITE INFORMATION: 1. SITE/PROJECT NAME: __________________________________________________ Walnut Creek - January Drive Flood Risk Reduction 2. COUNTY APPRAISAL DISTRICT PROPERTY ID (#’s): _________________________ 0247261325-0247261124 3. ADDRESS/LOCATION OF PROJECT: _______________________________________ 11502 to 11614 January Drive 4. WATERSHED: _________________________________________________________ Walnut Creek 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 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) ■ ■ ■ 6. DOES THIS PROJECT PROPOSE FLOODPLAIN MODIFICATION? (cid:133)YES** (cid:133)NO IF YES, THEN DO ANY OF THE FOLLOWING CONDITIONS APPLY? (check all that apply): (cid:133) (1) The floodplain modifications proposed are necessary to protect the public health and safety; (cid:133) (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:133) (3) The floodplain modifications proposed are necessary for development allowed in the critical water quality zone under LDC 25-8-261or 25-8-262, City Code 30-5-261 or 30-5-262. (cid:133) (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 in the Environmental Criteria Manual for forms and guidance) unless conditions 1 or 3 above apply. 7. DOES THIS PROJECT PROPOSE AN 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) and a Functional Assessment must be completed and attached to the ERI (see ECM 1.5 and Appendix X in the Environmental Criteria Manual for forms and guidance). REQUIRED INFORMATION FOR WAIVER REQUEST: Pursuant to LDC 25-8-121(D) or City Code 30-5-121(D), the Director of the Watershed Protection Department (WPD) may permit an applicant to exclude information that is required in ERI report if the Director determines that the information is unnecessary because of the scope or nature of the proposed development. Please provide the requested information below to WPD for review. Please be advised, if granted, this waiver may be rescinded in the future, if new information is discovered during the review process that requires that an ERI be completed for this site. 1. ____ A NARRATIVE DESCRIPTION of current site conditions and justifications to support the granting of the waiver request are attached at the end of this form. (See attachments) X X 2. . ____ The following MAPS of the site is attached: WPD ERM ERI Waiver-2014-01 Page 1 of 2  (Map Information available at http://www.austintexas.gov/GIS/DevelopmentWebMap/Viewer.aspx) ■ ■ (cid:13) Site Location Map (cid:13) Historic Aerial Photo at least 15 years old (cid:13) Current Aerial Photo (cid:13) Topographic Map with a 2 feet contour interval ■ ■ To the best of my knowledge, the responses to this form accurately and thoroughly reflect all information requested. Digitally signed by Xiaoqin Zhang, P.E. DN: C=US, E=xiaoqin.zhang@austintexas.gov, O=City of Austin, OU=Public Works Engineering Services Division, CN="Xiaoqin Zhang, P.E." Date: 2022.09.02 10:21:24-05'00' xiaoqin.zhang@austintexas.gov Xiaoqin Zhang, P.E. Print Name Xiaoqin Zhang, P.E. Signature City of Austin Name of Company 512.974-3562 Telephone Email Address 07/20/2021 Date WATERSHED PROTECTION DEPARTMENT USE ONLY. The waiver requested from LDC 25-8-121(D) of City Code 30-5-121(D) for the above reference project has been: (cid:19) Denied (cid:19) Approved (cid:19) Rescinded (cid:19) Approved with TCEQ Geologic Assessment ■ Reasoning for denial: (cid:13) Formal and/or administrative variances are required for this proposed development. (cid:13) Critical Environmental Features are present on or within 150 feet of site boundaries. (cid:13) The information provided is incomplete (see comments below). (cid:13) Denied, but the following sections can be omitted (see comments below). (cid:13) Other Reasoning for Approval (This form must be included with submittal materials and referenced in your Engineer’s Report and/or Summary): (cid:134) (cid:13) No Critical Environmental Features are present on or within 150 feet of the site boundaries. (cid:13) The site has existing impervious cover and no significant undisturbed natural areas. (cid:13) No floodplains, slopes >15%, CWQZs, WQTZs, wetlands, and the Edwards Aquifer contributing zone are present on site and TCEQ Geologic Assessment has been completed and will be submitted (Only for sites within the Edwards Aquifer). Comments: ■ (cid:13) Other: Comments: CEFs have already been identified ERM Reviewer (Print Name) Eric Brown 9/9/2022 If you have questions on how to fill out this form, please contact the Watershed Protection Department at 512/974-2550. WPD ERM ERI Waiver-2014-01 Page 2 of 2 POPLAR CVRIVER OAKS TRLTOBLER TRLDEUPREE DRAPRIL DRJANUARY DRWALNUT RIDGE DRMARCH DRFEBRUARY DRJANUARY DRIVE - RIMROCK & SPRINGLOCATION MAPLegendRock OutcropSpring LocationDrainage PipeStormDrainCulvertLateral<all other values>010020030040050FeetEXTRATERRITORIAL JURISDICTION 2 MILE ETJ AGRICULTURAL AGREEMENT Legend Jurisdiction FULL PURPOSE LIMITED PURPOSE OTHER CITY LIMITS OTHER CITIES ETJ TCAD Parcels TCAD Parcel IDs Jurisdiction FULL PURPOSE LIMITED PURPOSE EXTRATERRITORIAL JURISDICTION 2 MILE ETJ AGRICULTURAL AGREEMENT Activity Centers for Redevelopment in Sensitive Environmental Areas OTHER CITY LIMITS OTHER CITIES ETJ UCC Permit Imagine Austin Corridors Imagine Austin Centers Regional Center Town Center Neighborhood Center Job Center Fully Developed Floodplain COA Fully Developed 25-Year COA Fully Developed 100-Year COA Master Plan 25-Year COA Master Plan 100-Year 100-Year (Detailed-AE) 100-Year (Shallow-AO,AH) 100-Year (Approx-A) 0.1 0 0.04 0.1 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. 100 Year (Approx-A) X Protected by Levee 500 Year 1: 2,400 FEMA Floodplain Notes 100 Year (Detailed-AE) 100 year (Shallow-AO)  ENVIRONMENTAL COMMISSION RECOMMENDATION 20240515-005 Date: May 15, 2024 Subject: January Drive Flood Risk Reduction Project, SP-2022-0531D Motion by: Perry Bedford WHEREAS, the Environmental Commission recognizes the applicant is requesting to allow construction of drainage infrastructure within 50-feet of seep/ spring Critical Env Feature (CEF); AND WHEREAS, the Environmental Commission recognizes the site is located in Walnut Creek, Suburban Development Zone; THEREFORE, the Environmental Commission recommends the variance request with the following conditions: Staff Conditions: Second by: Peter Einhorn 1. Repair erosion throughout area. 2. Place Grow Zone Signs at 100 ft intervals, 30 ft from curb. 3. Expand native planting and seeding throughout the Grow Zone and the curb (no plantings outside of the Grow Zone; sod area for stabilization can remain.) 4. Ensure that placement of topsoil, temp irrigation and weed management are included with the restoration. 5. Remove remaining driveway aprons and replace with curb and gutter. Vote: 9-0 For: Perry Bedford, Richard Brimer, Hanna Cofer, Peter Einhorn, Mariana Krueger, Colin Nickells, Haris Qureshi, Melinda Schiera, David Sullivan Against: None Abstain: None Absent: Jennifer Bristol Attest: Perry Bedford, Environmental Commission Chair 1 of 1 C O L > LOC L O C LOT 1 BLK H FOUR SEASON CITY OF AUSTIN 11607 JANUARY DR C O L SAW CUT AT POC LOT 8 BLK F FOUR SEASON JENNIFER CURRIER 11614 JANUARY DR > L O C > LOT 2 BLK H FOUR SEASON CITY OF AUSTIN 11605 JANUARY DR L O C L O C L O C > ≻ + 3 0 0 6 . 5 ' ≻ ≻ 5.2' LOC C O L > ≻ ≻ LOC C O L LOT 20 BLK G FOUR SEASON ALI KHAVARMANESH 11613 JANUARY DR LOT 3 BLK H FOUR SEASON CITY OF AUSTIN 11603 JANUARY DR ≻ 2 + 0 0 > S S ≻ 3 L "A" 6" R C P ≻ 10+00 ≻ P C SL "I" 30" R ≻ S L O C 9+75 SSL "A" 48" RCP ≻ 1+00 0+77.81 LOT 4 BLK H FOUR SEASON CITY OF AUSTIN 11601 JANUARY DR L O C SAW CUT TO END 1 0 + 7 4 . 9 8 > C O L > C O L L O C LOC LOC LOC F E B R U A R Y D R I V E LOT 7 BLK F FOUR SEASON PHILIP STOKE 11612 JANUARY DR LOT 6 BLK F FOUR SEASON JUAN RODRIGUEZ 11610 JANUARY DR C O L 8 . 8' ≻ ≻ 0 0 + 4 L O C LOT 1 BLK G FOUR SEASON THOM FREDERICK 11513 MARCH DR C L O 0 0 + 5 ≻ ≻ > ≻ LO C LOT 2 BLK G FOUR SEASON THOM FREDERICK JR 11511 MARCH DR LOT 5 BLK F FOUR SEASON HOLTON AMY E. 11608 JANUARY DR LOT 4 BLK F FOUR SEASON CHRISTINE ROSALES. 11606 JANUARY DR C L O 6 . 1 ' ≻ 2 6.3' 4 " ≻ R S S L " C C P " L O C SSL "C" P18" RCP > 5.4' 1" 6' C L "L S S C 8" R 1 LOC C L O S L "A " 3 0" R ≻ S P C ≻ LO C > 6 + 0 0 P C R " 8 1 ≻ " D " L S S SAW CUT 3 FEET FROM INLETS LOT 3 BLK F FOUR SEASON MILTON OQUINN. 11604 JANUARY DR LOT 2 BLK F FOUR SEASON GORTON TYLER GRANT 11602 JANUARY DR C L O ≻ 7 + 0 0 R A U ≻ R IV > E LO C Y D C L O ≻ ≻ > N LO J A C LOT 17-A BLK E FOUR SEASON JOHNNY KUBICEK 11607 JANUARY DR LOT 1 BLK E FOUR SEASON KURT PENNYPACKER 11601 JANUARY DR EX. GRATE INLET > M A R C H D R I V E N A L P T N E M E V A P & L L A R E V O R D Y R A U N A J - K E E F R C T U N L A W I N O T C U D E R K S R D O O L F I I T N E M T R A P E D N O T C E T O R P D E H S R E T A W . I D R S G N R P S N O T R A B 5 0 5 4 0 7 8 7 S A X E T , I N T S U A 3 5 3 3 - 4 7 9 ) 2 1 5 ( : E N O H P T E OF TE X A S A S T XIAOQIN ZHANG, P.E. P R O F E R 96436 LICEN S E SSIONA L E N G IN EE D PROPOSED EXISTING LEGEND S K R A M E S R N O S V E ER T A D I I Y B . O N PROP. ALIGNMENT PROP. PAVEMENT EX. EASMENT EX. WASTEWATER MANHOLE STORM DRAIN MANHOLE JUNC. BOX /W MANHOLE EX. CURB INLET LOC LIMIT OF CONSTRUCTION 40 0 40 80 SCALE: 1" = 40 PLAN VIEW City of Austin WATERSHED PROTECTION SHEET NO. 9 SP-2022-0531D OF 38 March 14, 2024 PROP. HOT MIX ASPHALTIC PAVEMENT, 2 INCH , TYPE "D" PER BID ITEM 3402-SD TOTAL PAVED AREA 6,223.4 SY LOT 1 BLK F FOUR SEASON PATRICK CALLAN 11600 JANUARY DR A P R I L D R I V E C L O ≻ ≻ > LO C C L O ≻ 5 . 7 ' ≻ 8 . 7 ' > 8 + 0 0 LO C ≻ " E " L S S P C R " 8 1 C L O 5 . 6 ' 7 . 9 ' ≻ ≻ ≻ 9 + 0 0 12.1' 0.7' L O C L "L F S S 1" 1 ≻ 8" R S C P 2 S 4 L > " " R F " C P ≻ 8.2' C O L P C R " 8 1 " 5.8' F " L S S LOT 10 BLK D FOUR SEASON HARRIS TERRANCE 11509 JANUARY DR SAW CUT 3 FEET FRPM INLETS L C O C 18" R SL "LF2" P 4 . 9 S LOC > A P R I L D R I V E LOT 13 BLK C FOUR SEASON SAMUEL GRAHAM 11512 JANUARY DR LOT 12 BLK C FOUR SEASON MATTHEW CARDINAL 11510 JANUARY DR LOT 11 BLK C FOUR SEASON WANDA ADAMS 11508 JANUARY DR C L O ≻ ≻ 1 0 + 0 0 > LO C C L O S L "A " 3 0" R ≻ S P C ≻ > LO C LOC 5 . 3 3.9 ≻ 1 1 + 0 0 ≻ LOC LOT 9 BLK D FOUR SEASON DAVID SCHULTZ 11507 JANUARY DR LOT 8 BLK D FOUR SEASON KAREN BUSCH 11505 JANUARY DR LOT 10 BLK C FOUR SEASON DEQUINCY ADAMSON 11506 JANUARY DR LOT 9 BLK C FOUR SEASON THOMAS CUEVA 11504 JANUARY DR C LO 12+00 ≻ ≻ > LO C 3.8 4.3 L " H " C " R 4.6 S 8 S 1 S S ≻ P 1 L " 8 " R G " C SD P CONNECT TO EXISTING STORM SYSTEM. N WORK IS PROPOSED UPSTREAM OF THIS CONNECTION POINT LOT 8 BLK C FOUR SEASON MICHAEL LEISCH 11502 JANUARY DR LOC SAW CUT AT BEGINING OF DRIVEWAY EX. EASMENT