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Water & Wastewater Commission Review and Recommendation December 1, 2021 Government That Works for All COA Strategic Direction: Commission Meeting Date: Council Meeting Date: Department: Austin Water December 9, 2021 Client: Kevin Critendon Agenda Item Recommend approval of Service Extension Request No. 4796 for wastewater service to a 69.12-acre tract located at 8921 W. US 290 Highway within the Drinking Water Protection Zone, the City’s 2-mile Extra-Territorial Jurisdiction and Austin Water’s service area. (District 8) There is no anticipated fiscal impact. Amount and Source of Funding N/A N/A Purchasing Language: Prior Council Action: Boards and Commission Action: MBE/WBE: November 3, 2021 – Recommended by the Environmental Commission on an 8-0 vote. December 1, 2021 – To be reviewed by the Water and Wastewater Commission. N/A The 8921 Hwy 290 West project consists of approximately 69.12 acres of land (the “Property”). The Property is located entirely within the City of Austin’s (the “City”) 2-mile Extra-Territorial Jurisdiction, Impact Fee Boundary, Austin Water’s service area for wastewater, the Drinking Water Protection Zone, and the Slaughter Creek Watershed. A map of the property location is attached. Applicant: Ardent Residential (the “Applicant”) is proposing to develop approximately 280 multi- family units. The Applicant requested that the City provide wastewater utility service to the Property and Austin Water determined the service requirements as proposed in Service Extension Request (SER) No. 4796. West Travis County Public Utility Agency will provide retail water service to the Property. City Code § 25-9-35 requires City Council approval for this SER because the Property is located within the Drinking Water Protection Zone and outside the City’s full-purpose corporate limits. The City will not cost participate on this project. Infrastructure Improvements: To serve the Property, the Applicant will be required to construct: • Approximately 1,800 feet of 15-inch gravity wastewater main from the existing 15-inch gravity wastewater main near W SH 71 and extend west along Williamson Creek to Covered Bridge Drive, • Approximately 2,250 feet of 12-inch gravity wastewater main from the existing 8-inch gravity wastewater main located north of Towana Trail and extend west along Towana Trail and south along Mowinkle Drive, • An appropriately sized lift station within the Property, and • Approximately 5,150 feet of appropriately sized force main from the proposed lift station and extend north through the Property, northeast along US 290 Hwy, and then north along S. Bend Dr. to the existing 8-inch gravity wastewater main in Circle Dr. The proposed wastewater improvements are sized to serve the needs of the Property and will conform to all City Code requirements. These improvements will be designed in accordance with City’s Environmental Criteria Manual and Utilities Criteria Manual and will be inspected by the City’s Development Services Department. The Applicant will construct all required improvements at their cost and dedicate the public facilities to the City for ownership, operation and maintenance. All City fees are applicable to the provision of wastewater service including capital recovery fees. City Staff Recommendation: Austin Water has evaluated the Applicant’s request for City wastewater service and can provide centralized wastewater service as proposed in SER-4796. Attached is a report from Austin Water staff outlining additional technical information related to providing service to this tract. Additionally, a report provided by Watershed Protection Department staff that finds no significant environmental concerns with providing centralized wastewater service as proposed in SER-4796 is also attached. Contingent upon approval of SER-4796 for wastewater service to the Property, due to vesting rights granted per Chapter 245 of the State of Texas Local Government Code, approval of any related development applications for the Property is subject to regulations in effect in 1995, which does include creek buffers, structural water quality treatment requirements, critical environmental feature protections, and other environmental regulations. The proposed project is located in zip code 78737 and is near City Council District 8. WZ22 WY22 T H O M A S S P R I N G B R A N C H WY21 WZ21 A22 W S H 7 1 LOCATION MAP R W D 8921 Hwy 290 West T VIE Wastewater SER-4796 E HILL D U B L N A T DIS R A21 GS RD M AS SPRIN TH O R E D L C C I R WY20 WZ20 A20 B20 W ILLIA M S O N C R E E K R E D G RID D B E R E V O C TRAVIS COUNTY DEVILS PEN CREEK W U S 2 9 0 H W Y WY19 WZ19 A19 A18 D E V I L S P E N C R E E K A17 WZ18 WY18 Subject Tract Railroad GRID County Boundary / 0 S L A U G Jurisdictions Full-Purpose City Limit 2-Mile ETJ 5-Mile ETJ WY17 Limited-Purpose City Limit WZ17 H T E R C R E E K 1,000 2,000 4,000 Feet 6,000 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 City of Austin for the sole purpose of geographic reference. No warranty is made by the City of Austin regarding specific accuracy or completeness. 10/29/2021 B22 B21 B19 K I N C H E O N B R A N C H B18 B17 ABND PRIVATE LIFT STATION 0 1 0 1 1 0 3 0 9 8 0 9 6 0 9 9 0 1 0 5 0 1 1 2 0 1110 1100 WZ21 1100 1 1 1 0 1 0 6 0 0 8 9 970 1 0 1 0 1020 1 0 5 0 1 0 0 0 A21 GS RD 1 0 8 0 1 0 5 0 M AS SPRIN 1 0 0 0 1 0 4 0 0 2 0 1 1 0 7 0 1 1 0 0 1 0 9 0 1100 1 1 0 0 7 TH O 0 6 0 1 STAFF PROPOSED APPROXIMATLEY 2,250 FEET OF 1 0 9 0 12-INCH GRAVITY WASTEWATER MAIN (MINIMUM 1.0% SLOPE) STREA 0 1 0 1 M L A U 0 8 0 0 1 1 1 C SIDE D MURMURING CREEK DR WZ20 1 0 8 0 A22 9 9 0 W S H 7 1 A N C 1050 0 2 0 1 960 950 9 3 0 9 4 0 1 0 1 4 0 0 2 0 \ %\ %\ [7L \ %\ \ %\ \ %\ \ \ \ \ \ \ \ \ \ \ \ \ 0 1 0 1 % \ % \ % 9 1 % % L T % \ \ % S 3 0 % R A H U \ \ \ % \ \ R H A %\ 6 0 9 R 9 0 8 V % % % % % % % % % % % % LE 9 % % \ %\ % % % % T D 0 2 0 1 % %% 970 0 6 9 9 6 0 0 7 9 \ %\ % % % % 0 4 0 1 R NIG 8" P % %%%% % % % 1030 % % % 990 %% %% % % % C % % % % %%% V LANDMARK CONSERVANCY LS % % C % % % " P C % %% %% %% %% %% % V % V % % % " P % % " P 8 % % %%% % % % % % % 8 % % % %%% 8 % %% %% %% % %% %% % % % % % % % % B21 % %% % % % %% STAFF PROPOSED APPROXIMATELY [7L % %\% 1,800 FEET OF SUMMER SKY DR 15-INCH GRAVITY WASTEWATER MAIN (MINIMUM 0.5% SLOPE) %%%% % %% %% % 124869 % %% %% % %%%% % %% %%%%%%%%%%%%%%% R % GE D % % % %% %% % %%%% %% % % RID % 8" PVC %% D B %%% % 950 0 % % % %%%%%% %% %%% 7 E 9 ER % %% C OV 8" PVC % %%% V % %%% 8" C %%%%% % 8" P % % % % % % %%%% % % % % % % %% % %%%% %% % % %%% %% % % % %% % % %% C % C % % %% %% % % V V C %%% 8" P 8" P 8" PVC V % % % % %% % % % % %% 8" P % % % % % % % % % % % 8" PVC % % %%% % NDERBIRD RD % % %% % % % % % %% 8" PVC C %%%%%% %% % % 124875 % 890 % % % % !% % %%% % %%% %%%% % %%% %%% 880 % % !% !% % %% % %% % %% % % % % %% %% % [7L %% %%%% %% AB % %% % % % % % %% % %% % % % % % % %% 920 % % % % % %%%% % % C % % V %%%%%%%%%%%% %% % 8" P % % % R E D L K WIN O 200276 M % C V 8" P % C V 8" P % 8" P % % B20 %%% %%% % N % % % % 8" P 6" P V % 0 94 0 3 9 0 7 9 THU % 930 % 9 2 0 % % N D %% % % % % % % % XT % % % % % % % % % % % % % % % % % C C O % V C V % C % % % % % % %% A R O R 8 0 7 % % % % C 0 9 0 % % % % % % % % 0 % % % % 2 0 9 % % % % \ % W US 290 HWY %%%%% % % %%%% %%%% \\ RIDGEVIEW LS [7L %% %% % % \ %%%%%% %%%%%%%% 1040 1 0 7 0 \ % % % \ \ 1060 173 %% 0 0 0 % %%%% % 1 0 6 0 0 7 0 1 1060 B19 1010 990 0 3 0 1 9 7 0 %% % %%%%% % % \%\%\%\%\\ %\\ %\\\ %\\%\%\%\%\ \%\ %\%\ %\%\%\ 9 % 8 0 % % \ \ C \ V \ 4" P \ \ %\ 9 3 0 % % % !% % 950 9 3 0 C L R A L A N D W A N A T R L A20 T O K A T D O H L E R E E N D N T L A R P E T PIT S L L A R L N A M C \ \ R R A E T \ % R D 0 1 1 1 240017 1090 %\\ C % \ % V \ " P 240187 \ % \\ %%% \ \\\% % PRIVATE LIFT STATION 4 [7L \\ \ \\ % DI % \ 1 0 8 0 1080 \ " \ 6 %%%%% %% %%% \\\\ \\\\\\ %%%% % %%% % A19 %%% % 0 7 0 1 % 1 STAFF PROPOSED APPROXIMATELY 5,150 FEET OF APPROPRIATELY SIZED FORCE MAIN 990 1 0 1 0 950 A18 STAFF PROPOSED APPROPRIATELY SIZED LIFT STATION 930 920 0 1 9 0 4 9 1 0 1 0 1 0 2 0 980 B E L L A VIS B17 0 5 9 T A T R L B18 % 5 1 V P 0 3 9 " \ \ \ \ . % 9 %\%\ % % % %%% % % % % %%% \%%%\ %% % %%% % 6 \ % 0 \ 9 4 0 %\ %\ 0 1 9 %% 12" PVC %%%% % % %%% % %% \ %% \ %\ 920 %%%%% %%% PRIVATE LIFT STATION % [7L %%%% %% %% % % VIA RICCODR % %%% %%% % 0 7 960 %% %% %%% 9 % % % % !% !% N % % 9 8 0 %% R N L %%% % %%% % Y D % %% % % %% %%% % O %%%% % %% % S T %%% % D T % % A R A E %% N D %%% %%% %% % B W % %% % D Subject Tract E BIO % % % % % % % % % % % % % G R A 0 8 8 C T T Y E ! ! D A R B ! ! ! ! ! % 100-yr FEMA Floodplain Full-Purpose City Limit 2-Mile ETJ Limited-Purpose City Limit 0 1,000 2,000 4,000 6,000 Feet W.W. S.E.R. Name: 8921 W. Hwy 290 West W.W. S.E.R. Number: 4796 Utility Development Services Plotted 7/27/2021 C I R C L E D R 1 0 1 0 2 0 0 0 "J 9 6 0 0 6 9 1 0 3 0 9 9 0 WZ19 1 0 7 0 1 0 6 0 1060 0 5 0 1 R E E T N O T S E G D E L 1 0 4 0 0 2 0 1 WZ18 1 0 4 0 1 0 4 0 970 0 3 0 1 1 0 3 0 1050 SANDSTONE ST 1 0 2 0 9 8 0 970 Y O U N G L N . 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 the property boundaries. 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. DRAFT City of Austin | Austin Water P.O. Box 1088 Austin, TX 78767 AustinWater.org MEMORANDUM To: From: Date: Subject: 8921 Hwy 290 West (Wastewater SER-4796) Water and Wastewater Commissioners Brett Ueno, Utility Development Services November 22, 2021 Enclosed is additional technical information related to Wastewater SER-4796 and the associated Request for Council Action. Other SERs: • There are 5 wastewater SER applications located within one-half of a mile of the subject tract. Of these SERs, 3 were approved by City Council, 1 was administratively approved by Austin Water, and 1 was withdrawn. • There are 6 water SER applications located within one-half of a mile of the subject tract. Of these SERs, 1 was approved by City Council, 2 were administratively approved by Austin Water, and 3 were withdrawn. • Water service will be provided by West Travis County Public Utility Agency. • The City’s existing wastewater collection system is located approximately 3,900 feet Water Utility Service: Wastewater Utility Service: from the subject tract in Circle Dr. SER Improvements: • The SER improvements will cross Devil’s Pen Creek. The improvements will be located along the US 290 Hwy right-of-way at this creek crossing. • The SER improvements will conform to all applicable City Code requirements, be designed in accordance with City’s Environmental Criteria Manual and Utilities Criteria Manual and be inspected by the City’s Development Services Department. If you need additional information, please let me know. Thank you. cc: Colleen Kirk, P.E., SER Program Supervising Engineer Shwetha Pandurangi, P.E., Utility Development Services Division Manager Kevin Critendon, P.E., Assistant Director Greg Meszaros, Director The City of Austin is committed to compliance with the Americans with Disabilities Act (ADA). Reasonable modifications and equal access to communications will be provided upon request.  TO: FROM: MEMORANDUM Linda Guerrero, Chair, and Members of the Environmental Commission Kaela Champlin, Environmental Program Coordinator, Watershed Protection Department October 26, 2021 DATE: SUBJECT: 8921 US Hwy 290 West Wastewater SER #4976 Service Extension Requests (SER) located in the Drinking Water Protection Zone and outside of the City of Austin’s full purpose jurisdiction require Council approval and review by the Environmental Commission. Watershed Protection Department staff have completed the review for 8921 US Hwy 290 West wastewater SER #4976 and recommend approval of the request. Site Overview The site consists of one tract of approximately 69.12 acres, located at 8921 W US 290 Hwy. The site is located in the City of Austin’s 2-mile Extraterritorial Jurisdiction, the Slaughter Creek Watershed, the Barton Springs Zone (Contributing Zone), and the Drinking Water Protection Zone. Due to vesting rights granted per Chapter 245 of the State of Texas Local Government Code, all site development is subject to regulations in effect in 1995, which does include creek buffers, structural water quality treatment requirements, critical environmental feature (CEF) protections, and other environmental regulations, but the site is not subject to the Save Our Springs Ordinance. This property has an approved site plan for the Junction Athletic Complex, SP-2016-0607D, a proposed sports complex that has not been constructed. The applicant submitted a proposal to revise the previously approved site plan to develop a 280-unit multi-family project in the same development footprint with 140 Land Use Equivalents (LUEs). The proposed revised site plan was submitted for completeness check to the City of Austin on September 10, 2021 (SP-2016- 0607D(R1)). This property is also adjacent to the Ledgestone Multifamily wastewater SER #4622, located at 9021 W US 290 Hwy, and approved by City Council on June 11, 2020. The lines associated with the Ledgestone Multifamily SER have not been constructed. 2  Environmental Impacts The eastern portion of the site contains Devils Pen Creek and its associated critical water quality zone and water quality transition zone. There are seven wetland critical environmental features (CEFs) and one seep CEF on the property. The site does not drain to occupied salamander habitat. The previously approved site plan for the Junction Athletic Complex received three Land Use Commission variances for cut and fill exceeding four feet of depth, and construction in the water quality transition zone. Development Impacts Water: The site is in the water service area of the West Travis County Public Utility Agency (PUA). Wastewater: Due to the approved Ledgestone Multifamily SER associated with the adjacent parcel to the west of this site, there are two possible scenarios for the development of the lift station and force main for these properties. Under the first scenario, both developers will work together to build one lift station and force main to serve both properties. Under the second scenario, the developer for the SER currently under consideration (8921 US 290 W) will build a lift station and force main for this property only. When the Ledgestone Multifamily development is ready to extend service to their tract, they will be required to upgrade the lift station and force main or build their own lift station and parallel force main on their property (adjacent to the SER currently under consideration). Due to cost and limited allowable space within the ROW, the first scenario is the most likely; however, city staff cannot guarantee that the second scenario would not occur if both parties cannot come to an agreement on the first scenario. The information below describes the construction necessary for the gravity wastewater main for both the previously approved SER and the SER currently under consideration. • Approximately 1,800 feet of 15-inch gravity wastewater main (minimum 0.5% slope) from the existing 15-inch gravity wastewater main along Williamson Creek and extend west to the existing 12-inch gravity wastewater main located west of Covered Bridge Drive, as approximately shown on the attached map. The proposed 15-inch gravity wastewater main shall replace the existing 12-inch gravity wastewater main along its path. Applicant shall reconnect all existing wastewater services from the existing 12-inch gravity wastewater main to the proposed 15-inch gravity wastewater main. • Approximately 2,250 feet of 12-inch gravity wastewater main (minimum 1.0% slope) from the existing 8-inch gravity wastewater main located north of Towana Trail, and extend south towards Towana Trail, west along Towana Trail, and then south along Mowinkle Drive to the existing 8-inch gravity wastewater main in Mowinkle Drive, as approximately shown on the attached map. The proposed 12-inch gravity wastewater main shall replace the existing 8-inch gravity wastewater main along its path. Applicant shall reconnect all existing wastewater services from the existing 8-inch gravity wastewater main to the proposed 12-inch gravity wastewater main. 3  • Approximately 5,150 feet of appropriately sized force main from the proposed lift station and extend north through the subject tract and northeast along US 290 Hwy, and then north along S. Bend Dr. to the existing 8-inch gravity wastewater main located in Circle Drive. The portion of the proposed force main within the subject tract shall be located within an appropriately sized easement. Applicant shall transition to gravity service at the highest point that can be served by a proposed gravity wastewater main. Approximately 1,600 feet of the 1,800 feet of 15-inch gravity wastewater main is also proposed to be constructed by Granada Ridge (SP-2018-0138, SER #3299). If the applicant’s project timeline needs these wastewater improvements prior to the completion of them by others, then the design and construction of these improvements are the responsibility of the applicant. A conceptual drawing of the proposed wastewater main and lift station is provided in the attached SER application. The applicant has proposed to construct an appropriately sized public lift station within the subject tract at the approximate location shown on the attached map. The proposed lift station and site layout will be designed to facilitate future conversion to public by others, including the dedication of appropriately sized easements. The applicant shall dedicate appropriately sized wastewater easements from the proposed lift station to the western and northern property lines. The appropriately sized lift station and force main shall be sized to provide service to the subject tract only. However, the applicant is proposing to design the lift station so that access to the lift station is not obstructed and future expansions can be constructed. Construction of the wastewater main and lift station are required by LDC Chapter 25-8 to be located outside of the water quality transition zone and critical water quality zone. The layout of the proposed lift station will be reviewed when the project is submitted for site plan review and must comply with City Code. Should the applicant choose to pursue a lift station on this property that is in the critical or water quality transition zone, a variance approved by the Land Use Commission would be required. Staff would not recommend the variance, as the findings of fact required by the City’s Land Development Code would not be met. Alternative Wastewater Service: The site is allowed 25% net site area impervious cover. If service is not extended to the site and wastewater disposal is required, the applicant would likely apply for a Subsurface Area Drip Dispersal System (SADDS) issued by the Texas Commission on Environmental Quality. This would require 8.3 acres for a subsurface dispersal field, on-site storage, and on-site treatment plant, which would need to be deducted from the net site area calculations associated with impervious cover limits. Recommendation While sensitive environmental features do exist within the parcel and there is a concern that leaking pipes could cause environmental harm to the creek, WPD staff recommend approval of Service Extension Request #4796 for the following reasons: • The approved SER adjacent to the site will eventually allow for the construction of new public wastewater infrastructure and the proposed infrastructure is similar to that which has been approved previously for the adjacent parcel; 4  • the existing parcel already has an approved site plan for an athletic complex and the level of development associated with the proposed apartment buildings will be similar to the amount of development already allowed with the athletic complex due to site development regulations; and • the area that would be required for subsurface irrigation under an alternative wastewater treatment scenario would disturb over 8 acres of uplands. The attached information provides further detail on the applicant’s request. Please feel free to contact Kaela Champlin at (512) 974-3443 or kaela.champlin@austintexas.gov if you have any questions or comments about the proposed SER. cc: Brett Ueno, Austin Water Colleen Kirk, P.E., Austin Water Liz Johnston, Deputy Environmental Officer, Watershed Protection Department 5