20260401-003, SP-2024-0381C.SH Rundberg Multifamily Applicant Packet Part 2 — original pdf

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ENVIRONMENTAL RESOURCE INVENTORY City of Austin March 8, 2024 PE Project No.: 202402082 Approximately 6.54 Acres 204 East Rundberg Lane Austin, Texas 78753 Travis County Prepared for: Elmington Capital 1030 16th Avenue South Suite 500 Nashville, TN 37212 Prepared by: Phase Engineering, LLC 5524 Cornish Street Houston, Texas 77007 Case No.: (City use only) Environmental Resource Inventory For the City of Austin Related to LDC 25-8-121, City Code 30-5-121, ECM 1.3.0 & 1.10.0 The ERI is required for projects that meet one or more of the criteria listed in LDC 25-8-121(A), City Code 30-5-121(A). 1. SITE/PROJECT NAME: Rundberg Lane 2. COUNTY APPRAISAL DISTRICT PROPERTY ID (#’s): 814678 3. ADDRESS/LOCATION OF PROJECT: Approx. 6.54 acres at 204 East Rundberg Lane, Austin, Travis County, Texas 78753 4. WATERSHED: Little Walnut Creek 5. THIS SITE IS WITHIN THE (Check all that apply) Edwards Aquifer Recharge Zone* (See note below) .................. ☐YES ☒ No Edwards Aquifer Contributing Zone*.................................. ☐YES ☒ No Edwards Aquifer 1500 ft Verification Zone* ....................... ☐YES ☒ No Barton Spring Zone* .......................................................... ☐YES ☒ No *(as defined by the City of Austin – LDC 25-8-2 or City Code 30-5-2) Note: If the property is over the Edwards Aquifer Recharge zone, the Hydrogeologic Report and karst surveys must be completed and signed by a Professional Geoscientist Licensed in the State of Texas. 6. DOES THIS PROJECT PROPOSE FLOODPLAIN MODIFICATION?.......☐YES** ☒ NO If yes, then check all that apply:  (1) The floodplain modifications proposed are necessary to protect the public health and safety;  (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  (3) The floodplain modifications proposed are necessary for development allowed in the critical water quality zone under LDC 25-8-261 or 25-8-262, City Code 30-5-261 or 30-5-262.  (4) The floodplain modifications proposed are outside of the Critical Water Quality Zone in an area determined to be in poor or fair condition by a functional assessment of floodplain health. ** If yes, then a functional assessment must be completed and attached to the ERI (see ECM 1.7 and Appendix X for forms and guidance) unless conditions 1 or 3 above apply. 7. IF THE SITE IS WITHIN AN URBAN OR SUBURBAN WATERSHED, DOES THIS PROJECT PROPOSE A UTILITY LINE PARALLEL TO AND WITHIN THE CRITICAL WATER QUALITY ZONE? ......................................................... ☐ YES*** ☒NO ***If yes, then riparian restoration is required by LDC 25-8-261(E) or City Code 30-5-261(E) and a functional assessment must be completed and attached to the ERI (see ECM1.5 and Appendix X for forms and guidance). 8. There is a total of 0 (#’s) Critical Environmental Feature(s)(CEFs) on or within150 feet of the project site. If CEF(s) are present, attach a detailed DESCRIPTION of the CEF(s), color PHOTOGRAPHS, the CEF WORKSHEET and provide DESCRIPTIONS of the proposed CEF buffer(s) and/or wetland mitigation. Provide the number of each type of CEFs on or within 150 feet of the site (Please provide the number of CEFs ):  0 0 (#’s) Spring(s)/Seep(s) 0 (#’s) Point Recharge Feature(s) 0 (#’s) Bluff(s) (#’s) Canyon Rimrock(s) 0 (#’s) Wetland(s) Note: Standard buffers for CEFs are 150 feet, with a maximum of 300 feet for point recharge features. Except for wetlands, if the standard buffer is not provided, you must provide a written request for an administrative variance from LDC 25-8-281(C)(1) and provide written findings of fact to support your request. Request forms for administrative variances from requirements stated in LDC 25 -8-281 are available from Watershed Protection Department. 9. The following site maps are attached at the end of this report (Check all that apply and provide): All ERI reports must include: ☒Site Specific Geologic Map with 2-ft Topography (Figure 1) ☒ Historic Aerial Photo of the Site (Figure 2) ☒ Site Soil Map (Figure 3) ☒ Critical Environmental Features and Well Location Map on current Aerial Photo with 2-ft Topography Only if present on site (Maps can be combined): ☐Edwards Aquifer Recharge Zone with the 1500-ft Verification Zone (Only if site is over or within 1500 feet the recharge zone) ☐Edwards Aquifer Contributing Zone ☐Water Quality Transition Zone (WQTZ) ☐Critical Water Quality Zone (CWQZ) ☐City of Austin Fully Developed Floodplains for all water courses with up to 64-acres of drainage 10. HYDROGEOLOGIC REPORT – Provide a description of site soils, topography, and site specific geology below (Attach additional sheets if needed): Surface Soils on the project site is summarized in the table below and uses the SCS Hydrologic Soil Groups*. If there is more than one soil unit on the project site, show each soil unit on the site soils map. Soil Series Unit Names, Infiltration Characteristics & Thickness *Soil Hydrologic Groups Soil Series Unit Name & Subgroup** Group* Thickness (feet) Houston Black soils and Urban Land (HsD), 0 to 8 percent slopes D >5’ land, Urban and Whitewright soils (UtD), 0 to 8 percent slopes Austin, D 4’ Soils having a high infiltration rate when thoroughly wetted. Soils having a moderate infiltration rate when thoroughly wetted. Soils having a slow infiltration rate when thoroughly wetted. Soils having a very slow infiltration rate when thoroughly wetted. **Subgroup Classification – See Classification of Soil Series Table in County Soil Survey. WPD ERM ERI-2014-01 Page 2 of 6 Description of Site Topography and Drainage (Attach additional sheets if needed): Based on review of the City of Austin 2-foot Topographic Contour GIS dataset, the site elevation is approximately 668-688 feet above mean sea level, with sloping to the northeast toward an unnamed tributary of Little Walnut Creek which traverses the northeast corner of the property. The stream feature flows through a drainage culvert under a private driveway within the 150-foot buffer to the northwest of the property, flows toward the east-southeast across the north adjoining property as sheet-flow and into a typically dry stream bed near the northwest corner. The stream continues to the east through a drainage ditch between two adjacent single-family houses and through a culvert under N. Creek Drive. No other surface water features are depicted in the dataset or other sources within 150 feet of the property boundary. Additional information continued in Appendix. List surface geologic units below: Geologic Units Exposed at Surface Group Kau Formation Austin Chalk Member Cretaceous Brief description of site geology (Attach additional sheets if needed): The subject property is not located within the Edwards Aquifer Recharge, Transition, or Contributing Zones as mapped by the City of Austin Property Profile Tool. The property is underlain by Austin Chalk (Kau) formation according to a review of the Geologic Atlast of Texas Austin Sheet. No evidence of caves, sinkholes, or significant cavities were observed during the site visit assessment. (Cretaceous) Austin Chalk (Kau): “Chalk and marl; chalk mostly microgranular calcite with minor Foraminifera tests and Inoceramus prisms, averages about 85 percent calcium carbonate, ledge forming, grayish white to white; alternates with marl, bentonitic seams locally recessive, medium gray; pyrite nodules common, weather to limonite; thickness 325-420 feet” source: Bureau of Economic Geology, The University of Texas at Austin, Geologic Atlas of Texas Austin Sheet, 1974, scale: 1:250,000. The Site-Specific Geologic Map is exhibited as Figure 1 in the appendix. Wells – Identify all recorded and unrecorded wells on site (test holes, monitoring, water, oil, unplugged, capped and/or abandoned wells, etc.): There are 0 (#) wells present on the project site and the locations are shown and labeled. 0 (#’s) The wells are not in use and have been properly abandoned. 0 (#’s) The wells are not in use and will be properly abandoned. 0 (#’s) The wells are in use and comply with 16 TAC Chapter 76. There are 0 (#’s) wells that are off-site and within 150 feet of this site. WPD ERM ERI-2014-01 Page 3 of 6 11. THE VEGETATION REPORT – Provide the information requested below: Brief description of site plant communities (Attach additional sheets if needed): The property is located in the Northern Blackland Prairie ecoregion, as noted in Ecoregions of Texas (2007). This ecoregion is distinguished by fine-textured, clayey soils and predominately prairie potential natural vegetation. Vegetation in the region grows along soil and moisture gradients providing a variety of riparian versus drought-tolerant species. The 6.54-acre property has generally never been developed with the exception as small residential structures on the south portion of the property along East Rundberg Lane which were demolished by the early 1980s. The property is largely wooded with several dirt paths due to a vagrant community living in multiple tent camps on the property. Vegetation is dominated by large trees consisting of sugarberry, American elm, and tree privet with an understory of waxy-leaf privet. Short native grasses, forbs, and wildflowers are common. No hydrophytic species were observed. There is woodland community on site …………………….☒YES ☐NO (Check one). If yes, list the dominant species below: Woodland species Common Name Scientific Name American Elm Ashe juniper Eastern red cedar Sugarberry Tree Privet Waxy-leaf Privet Ulmus americana Juniperus asheii Juniperus virginiana Celtis laevigata Ligustrum lucidum Ligustrum quihoui There is grassland/prairie/savanna on site……………..☐YES ☒NO (Check one). If yes, list the dominant species below: Grassland/prairie/savanna species Common Name Scientific Name NONE There is hydrophytic vegetation on site ………………..☐YES ☒NO (Check one). If yes, list the dominant species in table below: Hydrophytic plant species Common Name Scientific Name Wetland Indicator Status NONE WPD ERM ERI-2014-01 Page 4 of 6 A tree survey of all trees with a diameter of at least eight inches measured four and one- half feet above natural grade level has been completed on the site. ☐YES ☒NO (Check one). Some of the trees on the property were tagged as part of a tree survey, but a survey was not provided. 12. WASTEWATER REPORT – Provide the information requested below. Wastewater for the site will be treated by (Check of that Apply): ☐ ☒ City of Austin Centralized sewage collection system On-site system(s) ☐ Other Centralized collection system Note: All sites that receive water or wastewater service from the Austin Water Utility must comply with City Code Chapter 15-12 and wells must be registered with the City of Austin The site sewage collection system is designed and will be constructed to in accordance to all State, County and City standard specifications. ☒YES ☐NO (Check one). Calculations of the size of the drainfield or wastewater irrigation area(s) are attached at the end of this report or shown on the site plan. ☐YES ☐NO ☒Not Applicable (Check one). Wastewater lines are proposed within the Critical Water Quality Zone? ☐YES ☒NO (Check one). If yes, then provide justification below: Is the project site over the Edwards Aquifer? ☐YES ☒ NO (Check one). If yes, then describe the wastewater disposal systems proposed for the site, its treatment level and effects on receiving watercourses or the Edwards Aquifer. WPD ERM ERI-2014-01 Page 5 of 6 13. One (1) hard copy and one (1) electronic copy of the completed assessment have been provided. Date(s) ERI Field Assessment was performed: February 28, 2024 Date(s) My signature certifies that to the best of my knowledge, the responses on this form accurately reflect all information requested. Tracy Watson Print Name Signature Phase Engineering, LLC Name of Company 713-854-8670 Telephone Tracy@phaseengineering.com Email Address March 8, 2024 Date For project sites within the Edwards Aquifer Recharge Zone, my signature and seal also certifies that I am a licensed Professional Geoscientist in the State of Texas as defined by ECM 1.12.3(A). WPD ERM ERI-2014-01 Page 6 of 6 City of Austin Environmental Resource Inventory - Critical Environmental Feature Worksheet Project Name: Rundberg Lane Project Address: 204 East Rundberg, Austin TX 78753 Site Visit Date: February 28, 2024 Environmental Resource Inventory Date: March 7, 2024 5 6 7 8 Primary Contact Name: Tracy Watson Phone Number: 713-854-8670 Prepared By: Tracy Watson Email Address: Tracy@PhaseEngineering.com FEATURE TYPE {Wetland,Rimrock, Bluffs,Recharge Feature,Spring} FEATURE ID (eg S-1) FEATURE LONGITUDE (WGS 1984 in Meters) FEATURE LATITUDE (WGS 1984 in Meters) WETLAND DIMENSIONS (ft) RIMROCK/BLUFF DIMENSIONS (ft) coordinate notation coordinate notation X Y Length Avg Height None RECHARGE FEATURE DIMENSIONS Z Y Trend X Springs Est. Discharge cfs 1 2 3 4 9 City of Austin Use Only CASE NUMBER: Wetland For rimrock, locate the midpoint of the segment that describes the feature. Rimrock Recharge Feature Spring Seep For wetlands, locate the approximate centroid of the feature and the estimated area. DMS DD For a spring or seep, locate the source of groundwater that feeds a pool or stream. YES NO □ GPS Surveyed □ □ Other sub-meter meter > 1 meter □ □ □ Professional Geologists apply seal below Please state the method of coordinate data collection and the approximate precision and accuracy of the points and the unit of measurement. Method Accuracy ERI WORKSHEET SECTION 9: SITE MAPS ERI Figure 1: Site-Specific Geologic Map with 2-ft Topography ERI Figure 2: 2002 Historic Aerial Photo ERI Figure 3: Site Soil Map ERI Figure 4: Critical Environmental Features and Well Locations TBPG Registered Firm #50283Site-Specific Geologic MapEnvironmental Resource InventoryMarch 2024Figure 1204 East Rundberg LaneAustin, Texas 78753Travis CountyLat/Long (dd): 30.3615488/-97.69202768Sources: 2021 Bexar & Travis County Lidar Stratmap, TNRIS. National Hydrography Dataset (NHD). Nearmap Aerial Imagery 12/31/2023.Geologic Database of Texas, 2014-02-01. Web. 2023-07-13.Spatial Reference: NAD 1983 StatePlane Texas Central FIPS 4203 Feet Copyright ©2024 Phase Engineering, LLCSlaytonDrGeorgianDrNCreekDrNorthDrHackberryLnWRundbergLnERundbergLnEPheasantDrNCreekDrOrioleDrERundbergLnKauAustin Sheet678676674672670666664662660656682680688686662664668668666664684664688686684682676674672666692690678682680678662660676674676672670668668666664670680684684682670668658682684674662688690690686688688686686684676678676676672674672672672670668668666664666692690688686684680678674672670670Subject Property150-Foot Subject Property BufferStream/River2-Foot Elevation ContourGeologic Unit (250K)Kau - Austin Chalk(Cretaceous) Austin Chalk (Kau): “Chalk and marl; chalk mostly microgranular calcite with minor Foraminifera tests and Inoceramus prisms, averagesabout 85 percent calcium carbonate, ledge forming, grayish white to white; alternates with marl, bentonitic seams locally recessive, medium gray;pyrite nodules common, weather to limonite; thickness 325-420 feet”Bureau of Economic Geology, The University of Texas at Austin, Geologic Atlas of Texas Austin Sheet, 1974, scale: 1:250,000.F08016024032040FeetScale: 1:3,000TBPG Registered Firm #502832002 Historical Aerial PhotographEnvironmental Resource InventoryMarch 2024Figure 2204 East Rundberg LaneAustin, Texas 78753Travis CountyLat/Long (dd): 30.3615488/-97.69202768Sources: Capital Area Council of Governments Imagery, February 2002.Service Layer Credits: Hybrid Reference Layer: Esri Community Maps Contributors, Austin Community College, Baylor University, City of Austin, Texas Parks & Wildlife, © OpenStreetMap,Microsoft, CONANP, Esri, TomTom, Garmin, SafeGraph, GeoTechnologies, Inc, METI/NASA, USGS, EPA, NPS, US Census Bureau, USDA, USFWSSpatial Reference: NAD 1983 StatePlane Texas Central FIPS 4203 Feet Copyright ©2024 Phase Engineering, LLCGeorgianDrNCreekDrNCreekDrNorthDrERundbergLnERundbergLnNCreekDrERockHollowSubject Property150-Foot Subject Property Buffer05010015020025FeetScale: 1:2,000FTBPG Registered Firm #50283Site-Specific Soils MapEnvironmental Resource InventoryMarch 2024Figure 3204 East Rundberg LaneAustin, Texas 78753Travis CountyLat/Long (dd): 30.3615488/-97.69202768Sources: 2021 Bexar & Travis County Lidar Stratmap, TNRIS. National Hydrography Dataset (NHD). Capital Area Council of Governments Imagery, February 2002.Soil Survey Staff. Gridded Soil Survey Geographic (gSSURGO) Database for Texas. United States Department of Agriculture, Natural Resources Conservation Service. Available online athttps://gdg.sc.egov.usda.gov/. December, 02, 2022 (202210 official release), Texas Water Science Center (USGS TWSC).Spatial Reference: NAD 1983 StatePlane Texas Central FIPS 4203 Feet Copyright ©2024 Phase Engineering, LLCGeorgianDrNCreekDrNorthDrHackberryLnERundbergLnOrioleDrngspurBlvdEPheasantDrNCreekDrOrioleDrERundbergLnUsCUtDUtDUsCUtDHsDNearmap Aerial Imagery (12/31/2023): Copyright nearmap 2015Hybrid Reference Layer: Esri Community Maps Contributors, Austin Community College, Baylor University, City of Austin, Texas Parks & Wildlife, © OpenStreetMap, Microsoft, CONANP, Esri, TomTom, Garmin, SafeGraph, GeoTechnologies, Inc, METI/NASA, USGS, EPA, NPS, US Census Bureau, USDA, USFWSSubject Property150-Foot Subject Property BufferNational Hydrography Dataset (NHD)Stream/RiverSSURGO Soil UnitHsD - Houston Black soils and Urban land, 0 to8 percent slopesUsC - Austin-Urban land complex, 2 to 5percent slopesUtD - Urban land, Austin, and Whitewrightsoils, 1 to 8 percent slopes08016024032040FeetScale: 1:3,000FMap unit: HsD - Houston Black soils and Urban land, 0 to 8 percent slopesComponent: Houston Black (56%)The Houston Black component makes up 56 percent of the map unit. Slopes are 0 to 8 percent. This component is on linear gilgai on ridges ondissected plains. The parent material consists of residuum weathered from calcareous shale of Taylor Marl and Eagleford Shale. Depth to a rootrestrictive layer is greater than 60 inches. The natural drainage class is moderately well drained. Water movement in the most restrictive layer is low.Available water to a depth of 60 inches (or restricted depth) is moderate. Shrink-swell potential is very high. This soil is not flooded. It is not ponded.There is no zone of water saturation within a depth of 72 inches. Organic matter content in the surface horizon is about 3 percent. This component isin the R086AY011TX Southern Blackland ecological site. Nonirrigated land capability classification is 3e. This soil does not meet hydric criteria. Thecalcium carbonate equivalent within 40 inches, typically, does not exceed 35 percent. There are no saline horizons within 30 inches of the soilsurface.Component: Urban land (30%)Generated brief soil descriptions are created for major soil components. The Urban land is a miscellaneous area.Map unit: UtD - Urban land, Austin, and Whitewrightsoils, 1 to 8 percent slopesComponent: Urban land (40%)Generated brief soil descriptions are created for majorsoil components. The Urban land is a miscellaneousarea.Component: Austin (30%)The Austin component makes up 30 percent of themap unit. Slopes are 1 to 8 percent. This componentis on ridges on dissected plains. The parent materialconsists of residuum weathered from chalk. Depth toa root restrictive layer, bedrock, paralithic, is 20 to 40inches. The natural drainage class is well drained.Water movement in the most restrictive layer ismoderately low. Available water to a depth of 60inches (or restricted depth) is moderate. Shrink-swellpotential is moderate. This soil is not flooded. It is notponded. There is no zone of water saturation within adepth of 72 inches. Organic matter content in thesurface horizon is about 3 percent. This component isin the R086AY007TX Southern Clay Loam ecologicalsite. Nonirrigated land capability classification is 4e.This soil does not meet hydric criteria. The calciumcarbonate equivalent within 40 inches, typically, doesnot exceed 55 percent.Component: Whitewright (25%)The Whitewright component makes up 25 percent ofthe map unit. Slopes are 1 to 8 percent. Thiscomponent is on ridges on dissected plains. Theparent material consists of residuum weathered fromAustin chalk formation. Depth to a root restrictivelayer, bedrock, paralithic, is 10 to 20 inches. Thenatural drainage class is well drained. Watermovement in the most restrictive layer is moderatelylow. Available water to a depth of 60 inches (orrestricted depth) is very low. Shrink-swell potential ismoderate. This soil is not flooded. It is not ponded.There is no zone of water saturation within a depth of72 inches. Organic matter content in the surfacehorizon is about 1 percent. This component is in theR086AY007TX Southern Clay Loam ecological site.Nonirrigated land capability classification is 4e. Thissoil does not meet hydric criteria. The calciumcarbonate equivalent within 40 inches, typically, doesnot exceed 55 percent. There are no saline horizonswithin 30 inches of the soil surface.TBPG Registered Firm #50283Critical Environmental Features and Well LocationsEnvironmental Resource InventoryMarch 2024Figure 4204 East Rundberg LaneAustin, Texas 78753Travis CountyLat/Long (dd): 30.3615488/-97.69202768Sources: City of Austin, TNRIS, USFWSService Layer Credits: Nearmap Aerial Imagery (12/31/2023): Copyright nearmap 2015Hybrid Reference Layer: Esri Community Maps Contributors, Austin Community College, Baylor University, City of Austin, Texas Parks & Wildlife, © OpenStreetMap, Microsoft, CONANP, Esri,TomTom, Garmin, SafeGraph, GeoTechnologies, Inc, METI/NASA, USGS, EPA, NPS, US Census Bureau, USDA, USFWSMS4/MS4_Map_Published: Travis County Transportation & Natural Resources DepartmentAAAAAGeorgianDrNCreekDrNorthDrHackberryLnWRundbergLnERundbergLnNCreekDrOrioleDrERundbergLn68267867667467066866666468668467266466266266469268868668468067867667468267266867066668268066465866866467667469067867466066266467668067667867867667466866666469069069069068868868668467667667667267267066866666666666266269068468468067867467267066632143215321632173218KarstZone 4CriticalWater Quality ZoneTravis / Williamson Counties Karst ZonesZone 1: areas known to containendangered cave faunaZone 2: areas having a high probability ofsuitable habitat for endangered or otherendemic invertebrate cave fauna (refinednow to only endangered cave fauna)Zone 3: areas that probably do not containendangered cave faunaZone 4: areas which do not containendangered cave faunaGolden-Cheeked Warbler Habitat (TravisCounty TNR)Confirmed Habitat Zone 1 (fee zone)Unconfirmed Habitat Zone 2 (fee zone)Not Known to be Habitat Zone 3 (no feezone)No Know Springs/Seeps/Recharge Featureat or Within 500 Feet of Subject Property!HNo Known Water Wells at or Within 500Feet of Subject PropertySubject Property150-Foot Subject Property Buffer2-Foot Elevation ContourCreeks (City of Austin)Critical Water Quality Zone07014021028035FeetScale: 1:2,500FERI WORKSHEET SECTION 10: Additional Information Additional Information: Rundberg Lane – Environmental Resource Inventory (ERI) Description of Site Topography and Drainage (continued) The National Wetland Inventory (NWI) Wetland Mapper was reviewed for potential aquatic features such as riverine waterbodies or wetlands on or within 150 feet of the subject property. The review identified one stream feature (R4SBC) traversing the north adjoining property and crossing the northeast corner of the subject property. The stream is described as a seasonally flooded, intermittent, riverine streambed. No wetlands or other waterbodies are depicted from the NWI Mapper. The subject property is located within Zone X unshaded, according to FEMA Flood Insurance Rate Map (FIRM) Panel No. 48453C0455J, dated January 6, 2016. Zone X unshaded is described as an area with minimal flood hazard outside of the 100- and 500- year floodplains. The subject property is also mapped outside of the City of Austin fully developed floodplain. The City of Austin Property Profile web map application was reviewed for previously identified environmental features such as Critical Environmental Features (CEFs), buffers, and setbacks. The review identified a Critical Water Quality Zone (CWQZ) and Erosion Hazard Zone Review Buffer along the unnamed stream channel on the north property boundary. The CWQZ encroaches onto the northwest corner of the subject property as shown on Figure 4 included in the appendix. No CEFs such as springs, seeps, point recharge features, bluffs, canyon rimrocks or wetlands are identified in the Property Profile webpage. A site visit to the property was conducted on February 28, 2024, to assess the property conditions and identify potential CEFs on and within 150 feet of the subject property. The property was found to be generally level with a slight slope to the north-northeast. Stormwater flows from a large culvert northwest of the property apparently flows to the east-southeast across the north adjoining property which is evident by ground scaring, erosion, and a significant amount of water-driven trash. The property was dry at the time of the visit with no standing water or saturated soil near the culvert or within the streambed. Although a distinct bed and bank of a stream channel is visible just east of the culvert to the northwest of the subject property, the bank flattens as it continues eastward allowing for water to flow across the surface as sheetflow until it concentrates to a defined channel again near the northeast corner of the subject property. Besides drainage patterns indicative of periodic stormwater flow, no persistent hydrology wetland indicators such as water marks on the base of trees or water-stained leaves, were observed. For this reason, there does not appear to be a high-water table allowing for the development of wetlands on or near the property. PHOTOGRAPHS Photo#: 1 Date Taken: 2/28/2024 Description: Typical view of the central portion of subject property showing the dirt paths. Photo#: 2 Date Taken: 2/28/2024 Description: View of drainage culvert to northwest of the subject property Photo Log PE 202402082 Photo#: 3 Date Taken: 2/28/2024 Description: View to east of culvert toward drainage path showing erosion due to stormwater flow Photo#: 4 Date Taken: 2/28/2024 Description: View of channel east of the culvert Photo Log PE 202402082 Photo#: 5 Date Taken: 2/28/2024 Description: View of water transported trash and debris on the north adjoining property. The bed and bank of the stream channel was not evident in this area. Photo#: 6 Date Taken: 2/28/2024 Description: View of stream bed which reappeared north of the northeast corner of the subject property. Exposed roots and large boulders are visible along the bank. Photo Log PE 202402082 Photo#: 7 Date Taken: 2/28/2024 Description: View of stream bed crossing the northeast corner of the subject property. Photo#: 8 Date Taken: 2/28/2024 Description: View of erosion and bank failure along the stream behind the adjoining single-family homes on the east adjoining properties. A small amount of water has ponded in this section of the stream bed only. Photo Log PE 202402082 Photo#: 9 Date Taken: 2/28/2024 Description: View along stream bed as it continues to the south and turns east between two single family homes east of the subject property. Photo#: 10 Date Taken: 2/28/2024 Description: View to east along stream bed as it continues east through a culvert under North Creek Drive. Photo Log PE 202402082 December 9, 2025 City of Austin 6310 Wilhelmina Delco Dr. Austin, Texas 78752 10523.00 RE: Environmental Commission Floodplain Modification Variance Request Rundberg Multifamily City of Austin Case Number: SP-2024-0381C.SH To Whom It May Concern: On behalf of our client, Elmington Capital Group, WGI is requesting a variance to LDC 25-8-261(G) and LDC 25-8-263(C)(3). The request is to allow for modification within the City of Austin fully developed floodplain and Critical Water Quality Zone, and allow for floodplain modification outside of the Critical Water Quality Zone (CWQZ) with a Functional Assessment of Floodplain Health (FAFH) score of good. The subject site is +/- 6.45 acres located at 204 E. Rundberg Lane near the intersection of E. Rundberg Lane and North Drive. The proposed project is for a SMART Housing and Affordability Unlocked 199-unit multifamily development which contains three multifamily buildings and associated site improvements for access, utility services, grading and drainage, and environmental protections. The site is not located within the Edwards Aquifer Recharge Zone or Contributing Zone. While there is no FEMA delineated floodplain on site, there is City of Austin 25-yr and 100-yr full developed floodplain that crosses the northern portion of the site due to the offsite contributing area greater than 64 acres immediately upstream. The offsite contributing area is routed along the northern edge of the site and conveyed to existing box culverts under North Creek Drive. In addition, there is a portion of CWQZ that clips the northeast corner of the property boundary of the site. These site characteristics severely limit the buildable area available, and a variance as described in the Environmental Commission Variance Application Form is required for development. The site plan was configured in a way to limit impacts to the floodplain and CWQZ and preserve the natural features where possible. Due to the floodplain modifications proposed, a floodplain restoration plan is provided in the plan set and included within this variance package. The floodplain restoration plan proposes additional plantings to help mitigate impacts to the floodplain and a contribution to the city’s floodplain mitigation fund will be made prior to permit approval. Please do not hesitate to contact me directly if you have any questions about this request or if you require additional information to conduct your evaluation. Sincerely, WGI Texas Engineering Firm No. F-15085 Sydney Barre, PE Project Manager 4700 Mueller Boulevard, Suite 300, Austin, TX 78723 512.669.5560 WGInc.com