20240306-005: NW Area Lift Station Variance Packet — original pdf

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ITEM FOR ENVIRONMENTAL COMMISSION AGENDA COMMISSION MEETING DATE: March 6, 2024 NAME & NUMBER OF PROJECT: NAME OF APPLICANT OR ORGANIZATION: Northwest Area Lift Station Improvements Great Hills Lift Station No.53 (SP-2022-0537C) Sharon Hamilton, Civil Team Engineers LLC on behalf of the Austin Water Utility Department LOCATION: 9009 ½ Spicebrush Drive, Austin, TX 78759 COUNCIL DISTRICT: District 6 ENVIRONMENTAL REVIEW STAFF: WATERSHED: REQUEST NO. 1: REQUEST NO. 2: REQUEST NO. 3: Brad Jackson, Environmental Compliance Specialist Senior, DSD, 512-974-2128, Brad.Jackson@austintexas.gov Bull Creek, Water Supply Suburban, Drinking Water Protection Zone A Land Use Commission variance is requested to allow development in the CWQZ for a lift station per LDC 25-8-261 A Land Use Commission variance is requested to allow construction of a building on a slope with a gradient of more than 25% per LDC 25-8-302(A)(1) A Land Use Commission variance is requested to allow fill up to 14 feet for construction of a lift station exceeding the 4-foot limitation per LDC 25-8-342 Page 2 of 2 STAFF RECOMMENDATION NO. 1: STAFF RECOMMENDATION NO. 2: STAFF RECOMMENDATION NO. 3: Staff recommends approval of the variance with a condition Staff recommends approval of the variance with a condition Staff recommends approval of the variance with a condition STAFF CONDITION: Provide structural containment of the fill with a retaining wall. Page 2 of 2 Development Services Department Staff Recommendations Concerning Required Findings Project Name: Ordinance Standard: Watershed Protection Ordinance Variance Request: Northwest Area Lift Station Improvements To allow development in the CWQZ for a lift station per LDC 25-8-261 Include an explanation with each applicable finding of fact. A. Land Use Commission variance determinations from Chapter 25-8-41 of the City Code: 1. The requirement will deprive the applicant of a privilege available to owners of similarly situated property with approximately contemporaneous development subject to similar code requirements. Yes. The variance will not be providing a special privilege to the applicant. The lift station is currently existing and in operation to provide wastewater (WW) service to the neighborhood. The variance for construction in the CWQZ will allow the replacement of the existing lift station with a new lift station to continue to provide WW service to the neighborhood. The old lift station will be decommissioned when the new lift station is complete. 2. The variance: a) Is not necessitated by the scale, layout, construction method, or other design decision made by the applicant, unless the design decision provides greater overall environmental protection than is achievable without the variance; Yes. The scale and layout of the new lift station has been designed based on the needs of the existing neighborhood for WW service. b) Is the minimum deviation from the code requirement necessary to allow a reasonable use of the property; Yes. The size and design of the new lift station will be the minimum amount of disturbance in the CWQZ to continue to supply WW service to the neighborhood and protect the creek from WW overflows due to equipment failure. c) Does not create a significant probability of harmful environmental consequences. Page 2 of 2 The variance does not create a significant probability of harmful consequences. Yes. The existing lift station is aging and prone to failure, leading to a WW overflow into Bull Creek. The variance will allow a new lift station and protect Bull Creek from a WW overflow. 3. Development with the variance will result in water quality that is at least equal to the water quality achievable without the variance. Yes. The project will provide for better water quality for the site and the neighborhood by preventing a failure of the existing lift station and WW overflow into Bull Creek. B. The Land Use Commission may grant a variance from a requirement of Section 25-8-422 (Water Supply Suburban Water Quality Transition Zone), Section 25-8-452 (Water Supply Rural Water Quality Transition Zone), Section 25-8-482 (Barton Springs Zone Water Quality Transition Zone), Section 25-8-368 (Restrictions on Development Impacting Lake Austin, Lady Bird Lake, and Lake Walter E. Long), or Article 7, Division 1 ( Critical Water Quality Zone Restrictions ), after determining that:: 1. The criteria for granting a variance in Subsection (A) are met; Yes, see above. 2. 3. The requirement for which a variance is requested prevents a reasonable, economic use of the entire property; Yes. The lift station must be constructed in line with the existing WW infrastructure which is also in the CWQZ. The variance is the minimum deviation from the code requirement necessary to allow a reasonable, economic use of the entire property. Yes. The lift station is designed to provide WW service to the existing neighborhood. Staff Determination: Staff determines that the findings of fact have been met. Staff recommends the following condition: Provide structural containment of the fill with a retaining wall. Environmental Reviewer (DSD) __________________________ Date 02/07/24 Environmental Review Manager (DSD) _____________________________ Mike McDougal Date 2/8/24 Deputy Environmental Officer (WPD) _____________________________ Liz Johnston Date 02/22/2024 Page 2 of 2 Development Services Department Staff Recommendations Concerning Required Findings Project Name: Ordinance Standard: Watershed Protection Ordinance Variance Request: Northwest Area Lift Station Improvements To allow construction of a building on a slope with a gradient of more than 25% per LDC 25-8-302(A)(1) Include an explanation with each applicable finding of fact. A. Land Use Commission variance determinations from Chapter 25-8-41 of the City Code: 1. The requirement will deprive the applicant of a privilege available to owners of similarly situated property with approximately contemporaneous development subject to similar code requirements. Yes. The variance will not be providing a special privilege to the applicant. The lift station is currently existing and in operation to provide WW service to the neighborhood. The variance for the building on slopes is required to house the equipment necessary for the lift station to operate. 2. The variance: a) Is not necessitated by the scale, layout, construction method, or other design decision made by the applicant, unless the design decision provides greater overall environmental protection than is achievable without the variance; Yes. The scale and layout of the new lift station and associated equipment housed within the building has been designed based on the needs of the existing neighborhood for WW service. b) Is the minimum deviation from the code requirement necessary to allow a reasonable use of the property; Yes. The building serves only to house equipment to protect it from the elements and ensure safe operation of the new lift station. The building is only 12 feet by 20 feet in size. c) Does not create a significant probability of harmful environmental consequences. The variance does not create a significant probability of harmful consequences. Yes. The existing lift station is aging and prone to failure, leading to a WW overflow into Bull Page 2 of 2 Creek. The variance will allow a new lift station and protect Bull Creek from a WW overflow. 3. Development with the variance will result in water quality that is at least equal to the water quality achievable without the variance. Yes. The project will provide for better water quality for the site and the neighborhood by preventing a failure of the existing lift station and WW overflow into Bull Creek. B. The Land Use Commission may grant a variance from a requirement of Section 25-8-422 (Water Supply Suburban Water Quality Transition Zone), Section 25-8-452 (Water Supply Rural Water Quality Transition Zone), Section 25-8-482 (Barton Springs Zone Water Quality Transition Zone), Section 25-8-368 (Restrictions on Development Impacting Lake Austin, Lady Bird Lake, and Lake Walter E. Long), or Article 7, Division 1 ( Critical Water Quality Zone Restrictions ), after determining that:: 1. The criteria for granting a variance in Subsection (A) are met; 2. 3. Not Applicable Not Applicable Not Applicable The requirement for which a variance is requested prevents a reasonable, economic use of the entire property; The variance is the minimum deviation from the code requirement necessary to allow a reasonable, economic use of the entire property. Staff Determination: Staff determines that the findings of fact have been met. Staff recommends the following condition: Provide structural containment of the fill with a retaining wall. Environmental Reviewer (DSD) __________________________ Date 02/07/24 Environmental Review Manager (DSD) _____________________________ Mike McDougal Date 2/8/24 Deputy Environmental Officer (WPD) _____________________________ Liz Johnston Date 02/22/2024 Page 2 of 2 Development Services Department Staff Recommendations Concerning Required Findings Project Name: Ordinance Standard: Watershed Protection Ordinance Variance Request: Northwest Area Lift Station Improvements To allow fill up to 14 feet for construction of a lift station exceeding the 4 foot limitation per LDC 25-8-342 Include an explanation with each applicable finding of fact. A. Land Use Commission variance determinations from Chapter 25-8-41 of the City Code: 1. The requirement will deprive the applicant of a privilege available to owners of similarly situated property with approximately contemporaneous development subject to similar code requirements. Yes. The variance will not be providing a special privilege to the applicant. The lift station is currently existing and in operation to provide WW service to the neighborhood. The variance for fill up to 14’ will allow the replacement of the existing lift station with a new lift station to continue to provide WW service to the neighborhood. The old lift station will be decommissioned when the new lift station is complete. 2. The variance: a) Is not necessitated by the scale, layout, construction method, or other design decision made by the applicant, unless the design decision provides greater overall environmental protection than is achievable without the variance; Yes. The scale and layout of the new lift station has been designed based on the needs of the existing neighborhood for WW service. b) Is the minimum deviation from the code requirement necessary to allow a reasonable use of the property; Yes. The fill is the minimum deviation from the 4-foot limit to allow access to the new lift station for maintenance and emergency repairs. c) Does not create a significant probability of harmful environmental consequences. Yes. The variance does not create a significant probability of harmful consequences. The existing lift station is aging and prone to failure, leading to a WW overflow into Bull Page 2 of 2 Creek. The variance will allow a new lift station and protect Bull Creek from a WW overflow. 3. Development with the variance will result in water quality that is at least equal to the water quality achievable without the variance. Yes. The project will provide for better water quality for the site and the neighborhood by preventing a failure of the existing lift station and WW overflow into Bull Creek. B. The Land Use Commission may grant a variance from a requirement of Section 25-8-422 (Water Supply Suburban Water Quality Transition Zone), Section 25-8-452 (Water Supply Rural Water Quality Transition Zone), Section 25-8-482 (Barton Springs Zone Water Quality Transition Zone), Section 25-8-368 (Restrictions on Development Impacting Lake Austin, Lady Bird Lake, and Lake Walter E. Long), or Article 7, Division 1 ( Critical Water Quality Zone Restrictions ), after determining that:: 1. The criteria for granting a variance in Subsection (A) are met; 2. 3. Not Applicable Not Applicable Not Applicable The requirement for which a variance is requested prevents a reasonable, economic use of the entire property; The variance is the minimum deviation from the code requirement necessary to allow a reasonable, economic use of the entire property. Staff Determination: Staff determines that the findings of fact have been met. Staff recommends the following condition: Provide structural containment of the fill with a retaining wall. Environmental Reviewer (DSD) __________________________ Date 02/07/24 Environmental Review Manager (DSD) _____________________________ Mike McDougal Date 2/8/24 Deputy Environmental Officer (WPD) _____________________________ Liz Johnston Date 02/22/2024 Northwest Li(cid:12) Sta(cid:15)on Improvements, Great Hills Li(cid:12) Sta(cid:15)on SP-2022-0537C Variance Request Ar(cid:15)cle 7, Division 1, Cri(cid:15)cal Water Quality Zone Restric(cid:15)ons, 25-8-261 Land Use Commission variance determina(cid:17)ons from 25-8-41(A) of the City Code 1. The requirement will deprive the applicant of a privilege or the safety of property given to owners of other similarly situated proper(cid:17)es with approximately contemporaneous development; a. YES, The exis(cid:17)ng li, sta(cid:17)on was approved with the subdivision and is noted on the Subdivision plat included on sheet 7 of the plans, dated March 1993. Replacement of the li, sta(cid:17)on is required to con(cid:17)nue provision of safe wastewater service to the subdivision. Therefore denying the variance will deprive the en(cid:17)re subdivision of wastewater service. 2. The variance a. Is not based on a condi(cid:17)on caused by the method chosen by the applicant to develop the property, unless the development method provides greater overall environmental protec(cid:17)on than is achievable without the variance. i. YES, The exis(cid:17)ng li, sta(cid:17)on is failing and must be upgraded; Aus(cid:17)n Water has an exis(cid:17)ng system that collects at this li, sta(cid:17)on. In order to con(cid:17)nue providing wastewater service to the subdivision and keep the exis(cid:17)ng li, sta(cid:17)on running during construc(cid:17)on, a new li, sta(cid:17)on must be built immediately adjacent to the exis(cid:17)ng. Denying the variance will deprive the en(cid:17)re subdivision of wastewater service. b. Is the minimum change necessary to avoid the depriva(cid:17)on of a privilege given to other property owners and to allow a reasonable use of the property i. YES, The li, sta(cid:17)on must be built at the exis(cid:17)ng collec(cid:17)on point in order to avoid rebuilding the en(cid:17)re wastewater infrastructure of the subdivision. Denying the variance will deprive the en(cid:17)re subdivision of wastewater service. c. Does not create a significant probability of harmful environmental consequences, and i. YES, the exis(cid:17)ng li, sta(cid:17)on is aging and failing, leaving the poten(cid:17)al for wastewater spills into Bull Creek if it is not replaced. The new li, sta(cid:17)on will provide improved service and reliability and will allow for con(cid:17)nued service to the subdivision. d. Development with the variance will result in water quality that is at least equal to the water quality achievable without the variance i. YES, the exis(cid:17)ng li, sta(cid:17)on is aging and failing, leaving the poten(cid:17)al for wastewater spills into Bull Creek if it is not replaced. The new li, sta(cid:17)on will provide improved service and reliability and will allow for con(cid:17)nued service to the subdivision. Addi(cid:17)onal Land Use Commission variance determina(cid:17)ons for a requirement of Ar(cid:17)cle 7, Division 1 (Cri(cid:17)cal Water Quality Zone Restric(cid:17)ons: e. The criteria for gran(cid:17)ng a variance in Subsec(cid:17)on A are met: i. YES, see above for each criteria. f. The requirement for which a variance is requested prevents a reasonable, economic use of the en(cid:17)re property; i. YES, the exis(cid:17)ng li, sta(cid:17)on is aging and failing. The new li, sta(cid:17)on will provide improved service and reliability and will allow for con(cid:17)nued service to the subdivision. g. The variance is the minimum devia(cid:17)on from the code requirement necessary to allow a reasonable economic use of the en(cid:17)re property. i. YES, the exis(cid:17)ng li, sta(cid:17)on is aging and failing. The new li, sta(cid:17)on will provide improved service and reliability and will allow for con(cid:17)nued service to the subdivision. Northwest Li(cid:12) Sta(cid:15)on Improvements, Great Hills Li(cid:12) Sta(cid:15)on SP-2022-0537C Variance Request Ar(cid:15)cle 7, Division 3, Construc(cid:15)on of a Building or Parking Area, 25-8-302(A)(1) Land Use Commission variance determina(cid:17)ons from 25-8-41(A) of the City Code 1. The requirement will deprive the applicant of a privilege or the safety of property given to owners of other similarly situated proper(cid:17)es with approximately contemporaneous development; 2. The variance a. YES, The exis(cid:17)ng li, sta(cid:17)on was approved with the subdivision and is noted on the Subdivision plat included on sheet 7 of the plans, dated March 1993. Replacement of the li, sta(cid:17)on is required to con(cid:17)nue provision of safe wastewater service to the subdivision. Therefore denying the variance will deprive the en(cid:17)re subdivision of wastewater service. The proposed building is a simple electrical enclosure sized 12’x20’ to house and protect necessary instrumenta(cid:17)on and controls for the improved li, sta(cid:17)on. Sheets 49 and 60 provide detailed informa(cid:17)on on the enclosure/building. The building is not proposed as a habitable structure and no staff will be working daily at the structure – maintenance crews will only access the sta(cid:17)on periodically for opera(cid:17)ons and maintenance. a. Is not based on a condi(cid:17)on caused by the method chosen by the applicant to develop the property, unless the development method provides greater overall environmental protec(cid:17)on than is achievable without the variance. i. YES, The exis(cid:17)ng li, sta(cid:17)on is failing and must be upgraded; Aus(cid:17)n Water has an exis(cid:17)ng system that collects at this li, sta(cid:17)on. In order to con(cid:17)nue providing wastewater service to the subdivision and keep the exis(cid:17)ng li, sta(cid:17)on running during construc(cid:17)on, a new li, sta(cid:17)on must be built immediately adjacent to the exis(cid:17)ng. Denying the variance will deprive the en(cid:17)re subdivision of wastewater service or will require the aging and deteriorated li, sta(cid:17)on to remain in service. b. Is the minimum change necessary to avoid the depriva(cid:17)on of a privilege given to other property owners and to allow a reasonable use of the property i. YES, The li, sta(cid:17)on must be built at the exis(cid:17)ng collec(cid:17)on point in order to avoid rebuilding the en(cid:17)re wastewater infrastructure of the subdivision. Denying the variance will deprive the en(cid:17)re subdivision of wastewater service or will require the aging and deteriorated li, sta(cid:17)on to remain in service. c. Does not create a significant probability of harmful environmental consequences, and i. YES, the exis(cid:17)ng li, sta(cid:17)on is aging and failing, leaving the poten(cid:17)al for wastewater spills into Bull Creek if it is not replaced. The new li, sta(cid:17)on will provide improved service and reliability and will allow for con(cid:17)nued service to the subdivision. Denying the variance will require the aging and deteriorated li, sta(cid:17)on to remain in service. d. Development with the variance will result in water quality that is at least equal to the water quality achievable without the variance i. YES, the exis(cid:17)ng li, sta(cid:17)on is aging and failing, leaving the poten(cid:17)al for wastewater spills into Bull Creek if it is not replaced. The new li, sta(cid:17)on will provide improved service and reliability and will allow for con(cid:17)nued service to the subdivision. Addi(cid:17)onal Land Use Commission variance determina(cid:17)ons for a requirement of Ar(cid:17)cle 7, Division 1 (Cri(cid:17)cal Water Quality Zone Restric(cid:17)ons: e. The criteria for gran(cid:17)ng a variance in Subsec(cid:17)on A are met: i. YES, see above for each criteria. f. The requirement for which a variance is requested prevents a reasonable, economic use of the en(cid:17)re property; i. YES, the exis(cid:17)ng li, sta(cid:17)on is aging and failing. The new li, sta(cid:17)on will provide improved service and reliability including emergency generator and improved access for maintenance and will allow for con(cid:17)nued service to the subdivision. g. The variance is the minimum devia(cid:17)on from the code requirement necessary to allow a reasonable economic use of the en(cid:17)re property. i. YES, the exis(cid:17)ng li, sta(cid:17)on is aging and failing. The new li, sta(cid:17)on will provide improved service and reliability and will allow for con(cid:17)nued service to the subdivision. Northwest Li(cid:12) Sta(cid:15)on Improvements, Great Hills Li(cid:12) Sta(cid:15)on SP-2022-0537C Variance Request Ar(cid:15)cle 7, Division 5, Fill Requirements 25-8-342 Land Use Commission variance determina(cid:17)ons from 25-8-41(A) of the City Code 1. The requirement will deprive the applicant of a privilege or the safety of property given to owners of other similarly situated proper(cid:17)es with approximately contemporaneous development; a. YES, The exis(cid:17)ng li, sta(cid:17)on was approved with the subdivision and is noted on the Subdivision plat included on sheet 7 of the plans, dated March 1993. Replacement of the li, sta(cid:17)on is required to con(cid:17)nue provision of safe wastewater service to the subdivision. Therefore denying the variance will deprive the en(cid:17)re subdivision of wastewater service. The proposed li, sta(cid:17)on is immediately adjacent to the exis(cid:17)ng. In order to provide maintenance access to the new li, sta(cid:17)on, fill of 4 feet up to 13.5 feet is required, as shown on sheet 22 of the plans. 2. The variance a. Is not based on a condi(cid:17)on caused by the method chosen by the applicant to develop the property, unless the development method provides greater overall environmental protec(cid:17)on than is achievable without the variance. i. YES, The exis(cid:17)ng li, sta(cid:17)on is failing and must be upgraded; Aus(cid:17)n Water has an exis(cid:17)ng system that collects at this li, sta(cid:17)on. In order to con(cid:17)nue providing wastewater service to the subdivision and keep the exis(cid:17)ng li, sta(cid:17)on running during construc(cid:17)on, a new li, sta(cid:17)on must be built immediately adjacent to the exis(cid:17)ng. Denying the variance will deprive the en(cid:17)re subdivision of wastewater service. The proposed design provides accessible facili(cid:17)es for Aus(cid:17)n Water to perform con(cid:17)nued maintenance and opera(cid:17)ons. b. Is the minimum change necessary to avoid the depriva(cid:17)on of a privilege given to other property owners and to allow a reasonable use of the property i. YES, The li, sta(cid:17)on must be built at the exis(cid:17)ng collec(cid:17)on point in order to avoid rebuilding the en(cid:17)re wastewater infrastructure of the subdivision. Denying the variance will deprive the en(cid:17)re subdivision of wastewater service. Fill must be added to level up the site and make the facility accessible by vehicles in emergency situa(cid:17)ons. c. Does not create a significant probability of harmful environmental consequences, and i. YES, the exis(cid:17)ng li, sta(cid:17)on is aging and failing, leaving the poten(cid:17)al for wastewater spills into Bull Creek if it is not replaced. The new li, sta(cid:17)on will provide improved service and reliable access for Aus(cid:17)n Water, as well as allowing for con(cid:17)nued service to the subdivision. d. Development with the variance will result in water quality that is at least equal to the water quality achievable without the variance i. YES, the exis(cid:17)ng li, sta(cid:17)on is aging and failing, leaving the poten(cid:17)al for wastewater spills into Bull Creek if it is not replaced. The new li, sta(cid:17)on will provide improved service and reliability and will allow for con(cid:17)nued service to the subdivision. LOT 7 GREAT HILLS XXVI BOOK 91 PAGE 295 P.R.T.C.TX. LOT 6 GREAT HILLS XXVI BOOK 91 PAGE 295 P.R.T.C.TX. LOT 5 GREAT HILLS XXVI BOOK 91 PAGE 295 P.R.T.C.TX. P.R.T.C.TX. ABANDONED ACCESS ROAD EASEMENT WATER QUALITY TRANSITION ZONE CRITICAL WATER QUALITY ZONE 30' W.W.E. BOOK 91 PAGE 295 P.R.T.C.TX. EXIST 8" DI WWL 93-0626 EXIST 8" DI WWL 93-0626 WW WW W W WW WW W W M H EXIST 8" DI WWL 93-0626 150-FT ZONE FOR CRITICAL ENVIRONMENTAL FEATURE W W M H W W APPROXIMATE LOCATION OF 10' ELECTRIC, TELEPHONE & TV CABLE EASEMENT VOLUME 11642, PAGE 268 P.R.T.C.TX. W W CRITICAL ENVIRONMENTAL FEATURE CANYON RIMROCK W W W W M H COA WASTEWATER EASEMENT PARCEL 5354.01 WE 0.042 ACRES (1,846 S.F.) W W COA WASTEWATER EASEMENT PARCEL 5354.02 WE 0.091 ACRES (3,965 S.F.) M H W W W W PROPOSED LIFT STATION 100-YR FEMA FLOODPLAIN / COA 25-YEAR FULLY DEVELOPED FLOODPLAIN W W 500-YR FEMA FLOODPLAIN / COA 100-YEAR FULLY DEVELOPED FLOODPLAIN WASTE WATER EASEMENT BOOK 91 PAGE 295 P.R.T.C.TX. EXIST 12" PVC WWL 84-0909 ℄ BULL CREEK W W WW WW WW WW WW WW WW WW W W M H W W M H EXISTING LIFT STATION (TO BE DEMOLISHED) W W M H W W W W M H W W W W M H EXIST 8" PVC WWL 84-0909 EXIST 8" PVC WWL 84-0909 EXIST 16" DI FM 85-0594 SUBSURFACE EROSION HAZARD ZONE P.U.E. DRAINAGE EASEMENT & PRIVATE GREENBELT 500-YR FEMA FLOODPLAIN / COA 100-YEAR FULLY DEVELOPED FLOODPLAIN CRITICAL ENVIRONMENTAL FEATURE CANYON RIMROCK 100-YR FEMA FLOODPLAIN / COA 25-YEAR FULLY DEVELOPED FLOODPLAIN I I I I N N O O T T P P R R C C S S E E D D N N O O S S V V E E R R I I I I E E T T A A D D Y Y B B 0 VERTICAL SCALE IN FEET 20 40 HORIZONTAL SCALE IN FEET SCALE: 1" = 20' LEGEND CRITICAL WATER QUALITY ZONE WATER QUALITY TRANSITION ZONE . . V V E E R R . . O O N N T E O F TE X A S A S T CHRISTOPHER M. LEAL P R O F E 97373 D LICEN S E SSIONA L E N R G IN EE 1/4/2024 THE SEAL APPEARING ON THIS DOCUMENT WAS AUTHORIZED BY CHRISTOPHER M. LEAL LIC. # 97373 I CERTIFY THAT THESE DRAWINGS ARE COMPLETE, ACCURATE AND ADEQUATE FOR PURPOSES, INCLUDING CONSTRUCTION, BUT ARE NOT AUTHORIZED FOR CONSTRUCTION UNTIL FORMAL CITY APPROVAL. INTENDED THEIR S A X E T , I N T S U A F O Y T C I R E T A W N T S U A I I I I I N O S V D S E C V R E S G N R E E N G N E I I S T N E M E V O R P M I I N O T A T S T F I L A E R A T S E W H T R O N 3 5 . I O N N O T A T S T F I L S L L I H T A E R G S E R U T A E F L A T N E M N O R V N E I NOTES NOTES NAME NAME DATE DATE SURVEY BY SURVEY BY DRAWN BY DRAWN BY JRW 02/22 DESIGNED BY DESIGNED BY TJK 02/22 CHECKED BY CHECKED BY CML 02/22 REVIEWED BY REVIEWED BY 1120 S. Capital of Texas Highway CityView 2, Suite 100 Austin, Texas 78746 P - 512.338.1704 F - 512.338.1784 TBPE Firm #6535 www.kfriese.com C2 1 E M A N T E E H S 2 E M A N T E E H S . B T S D S E _ A O C , - - - - , I \ . \ \ G W D R V N E - 0 6 7 0 S T E E H S N G D N G S E D _ S L _ S L L I H _ T A E R G _ A O C _ 0 6 7 0 \ S T C E J O R P \ : X M P 1 5 : 4 4 2 0 2 / 4 / 1 G I L L I W Y D U J 150-FT ZONE FOR CRITICAL ENVIRONMENTAL FEATURE 9009 1/2 SPICEBRUSH DRIVE AUSTIN, TX 78759 CASE NUMBER: SP-2022-0537C SHEET 10 OF 63 CWQZWQTZNorthwest Area Lift Station Improvements Great Hills LiftStation No. 53 (SP-2022-0537C)_________________________________________________EXIST 8" DI WWL 93-0626 EXIST 8" DI WWL 93-0626 EXIST 8" DI WWL 93-0626 PROPOSED NATURAL GAS GENERATOR PAD E.O.S. 657.68 X PROPOSED WET WELL PROPOSED JUNCTION BOX RACK E.O.S. 657.68 X E.O.S. 657.38 X 1.0% X T.O.S. 657.5 T.O.S. 657.5 X 657 E.O.S. 656.48 X 2 . 0 % X T.O.C. 658.0 658 X T.O.S. 657.715 1 . 0 T.O.S. 657.715 X 2 2 . . 0 0 % % X T.O.W. 657.0 PROPOSED 5-FT DIA PRECAST POLYMER MH #1 657 PROPOSED CONTROL ENCLOSURE 2 . 0 % X T.O.C. 658.0 T.O.C. 658.0 X PROPOSED JIB CRANE PROPOSED VALVE VAULT X T.O.W. 656.3 2 . 0 % T.O.C. 658.0 X X T.O.C. 658.0 2 . 0 % T.O.W. 656.82 X T.O.W. 656.32 X EXIST 12" PVC WWL 84-0909 T.O.W. 656.23X X T.O.W. 656.0 PROPOSED 4-FT DIA PRECAST MH #4 6 4 8 6 4 7 6 4 6 6 4 5 PROPOSED 5-FT DIA PRECAST MH #2 500-YR FEMA FLOODPLAIN / COA 100-YEAR FULLY DEVELOPED FLOODPLAIN BLAKELY DAVID LOT 6 GREAT HILLS XXVI EXIST 8" PVC WWL 84-0909 EXIST 8" PVC WWL 84-0909 PROPOSED 4-FT DIA PRECAST MH #3 CREEK ℄ INSTALL PROPOSED 6-FT DIA CAST IN PLACE VAULT WITH ULTRASONIC FLOW METER ON EXISTING FORCE MAIN. SEE DETAIL ON SHEET C24. REMOVE EXISTING FLOW METER VAULT. EXIST 16" DI FM 85-0594 500-YR FEMA FLOODPLAIN / COA 100-YEAR FULLY DEVELOPED FLOODPLAIN EWING MANUELA & GREGORY R LOT 5 GREAT HILLS XXVI 0 VERTICAL SCALE IN FEET 10 20 HORIZONTAL SCALE IN FEET SCALE: 1" = 10' LEGEND x SPOT ELEVATIONS NATIVE GRASS SHALL BE INSTALLED PER SPEC SS02800 NOTE: 1. SEE STRUCTURAL SITE PLAN S1 SHEET FOR FINISH LIFT STATION ELEVATIONS AND TOP OF WALL SPOT ELEVATIONS. 2. PROPOSED CONCRETE PAVING TO MATCH PRE-EXISTING CONDITIONS. Slopes Table Number Minimum Slope Maximum Slope Color 1 2 3 4 0% 15% 25% 15% 25% 35% 35% AND GREATER 1817903% 35% 35% AND GREATER I I I I N N O O T T P P R R C C S S E E D D N N O O S S V V E E R R I I I I E E T T A A D D Y Y B B . . V V E E R R . . O O N N T E O F TE X A S A S T CHRISTOPHER M. LEAL P R O F E 97373 LICEN S E SSIONA L D E N R G IN EE 10/31/2022 THE SEAL APPEARING ON THIS DOCUMENT WAS AUTHORIZED BY CHRISTOPHER M. LEAL LIC. # 97373 I CERTIFY THAT THESE DRAWINGS ARE COMPLETE, ACCURATE AND ADEQUATE FOR PURPOSES, INCLUDING CONSTRUCTION, BUT ARE NOT AUTHORIZED FOR CONSTRUCTION UNTIL FORMAL CITY APPROVAL. INTENDED THEIR S A X E T , I N T S U A F O Y T C I R E T A W N T S U A I I I I I N O S V D S E C V R E S G N R E E N G N E I I I N A L P G N D A R G N O T A T S T F I L I NOTES NOTES NAME NAME DATE DATE SURVEY BY SURVEY BY DRAWN BY DRAWN BY JRW 02/22 DESIGNED BY DESIGNED BY TJK 02/22 CHECKED BY CHECKED BY CML 02/22 REVIEWED BY REVIEWED BY : S T N E M E V O R P M I I N O T A T S T F I L A E R A T S E W H T R O N 3 5 . I O N N O T A T S T F I L S L L I H T A E R G C13 1 E M A N T E E H S 2 E M A N T E E H S . B T S D S E _ A O C , - - - - , \ . I \ G W D D A R G - 0 6 7 0 \ S T E E H S N G D N G S E D _ S L _ S L L I H _ T A E R G _ A O C _ 0 6 7 0 \ S T C E J O R P \ : X M P 9 4 : 5 3 2 0 2 6 / / 1 1 N A M D E T S N E K 9009 1/2 SPICEBRUSH DRIVE AUSTIN, TX 78759 CASE NUMBER: SP-2022-0537C SHEET 21 OF 63 12' x 20' equipmentenclosure building onslopesNorthwest Area Lift Station Improvements Great Hills LiftStation No. 53 (SP-2022-0537C)_________________________________________________WW WW WW WW WW WW WW WW WW WW WW WW EXIST 8" DI WWL 93-0626 WW WW WW WW W W M W W H WW WW W W W W W W W W W W W W W W W W EXIST 8" DI WWL 93-0626 W W M H W W W W W W W W W W W W W W W W 0 VERTICAL SCALE IN FEET 10 20 HORIZONTAL SCALE IN FEET SCALE: 1" = 10' CUT/FILL TABLE NO. MIN. ELEVATION MAX. ELEVATION QTY 1 2 3 4 0.00 4.00 8.00 12.00 4.00 8.00 12.00 13.50 657 2 . 0 % 2 . 0 % 656 655 654 653 652 651 650 649 648 647 646 6 5 7 645 644 643 642 641 WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW EXIST 12" PVC WWL 84-0909 EXIST 8" DI WWL 93-0626 W W W W W W W W W W W W W W W W 2 . 0 % 6 5 8 2 2 . . 0 0 % % 657 W W W W 1 .0 W W W W W W M H W W W W W W W W W W M H 2 . 0 % W W M H 6 5 5 5 3 5 6 5 6 6 4 2 6 1.0% 1 5 5 6 0 6 9 4 648 647 646 645 644 643 W W W W W W W W W W W W W W W W W W W W W W W W W W M H 6 4 8 6 4 7 6 4 6 6 4 5 EXIST 16" DI FM 85-0594 EXIST 8" PVC WWL 84-0909 W W W W W W W W W W W W W W M H EXIST 8" PVC WWL 84-0909 WW WW WW WW WW WW WW I I I I N N O O T T P P R R C C S S E E D D N N O O S S V V E E R R I I I I E E T T A A D D Y Y B B . . V V E E R R . . O O N N T E O F TE X A S A S T CHRISTOPHER M. LEAL P R O F E 97373 D LICEN S E SSIONA L E N R G IN EE 1/4/2024 THE SEAL APPEARING ON THIS DOCUMENT WAS AUTHORIZED BY CHRISTOPHER M. LEAL LIC. # 97373 I CERTIFY THAT THESE DRAWINGS ARE COMPLETE, ACCURATE AND ADEQUATE FOR PURPOSES, INCLUDING CONSTRUCTION, BUT ARE NOT AUTHORIZED FOR CONSTRUCTION UNTIL FORMAL CITY APPROVAL. INTENDED THEIR S A X E T , I N T S U A F O Y T C I R E T A W N T S U A I I I I I N O S V D S E C V R E S G N R E E N G N E I I : S T N E M E V O R P M I I N O T A T S T F I L A E R A T S E W H T R O N 3 5 . I O N N O T A T S T F I L S L L I H T A E R G N A L P L L I F D N A T U C N O T A T S T F I L I NOTES NOTES NAME NAME DATE DATE SURVEY BY SURVEY BY DRAWN BY DRAWN BY JRW 02/22 DESIGNED BY DESIGNED BY TJK 02/22 CHECKED BY CHECKED BY CML 02/22 REVIEWED BY REVIEWED BY 1120 S. Capital of Texas Highway CityView 2, Suite 100 Austin, Texas 78746 P - 512.338.1704 F - 512.338.1784 TBPE Firm #6535 www.kfriese.com C14 1 E M A N T E E H S 2 E M A N T E E H S . B T S D S E _ A O C , E P A C S D N A L _ 4 3 X 2 2 _ A O C , \ \ . I G W D D A R G - 0 6 7 0 \ S T E E H S N G D N G S E D _ S L _ S L L H _ T A E R G _ A O C _ 0 6 7 0 S T C E J O R P I \ \ : X M P 4 1 : 5 4 2 0 2 / 4 / 1 G I L L I W Y D U J 9009 1/2 SPICEBRUSH DRIVE AUSTIN, TX 78759 CASE NUMBER: SP-2022-0537C SHEET 22 OF 63 Northwest Area Lift Station Improvements Great Hills LiftStation No. 53 (SP-2022-0537C)_________________________________________________ 48"X96" ALUMINUM COVER WITH SAFETY GRATE PROVIDED BY WET WELL MANUFACTURER. (SEE NOTE 1) 6" 316 STAINLESS STEEL SCH. 40 GOOSENECK VENT WITH STAINLESS STEEL SCREEN 82"x65" EAST JORDAN, OR APPROVED EQUAL ALUMINUM FLOOR HATCH (SEE NOTE 1) 0 4 8 12 GRAPHIC SCALE: 1/4" = 1'-0" 36"x42" EAST JORDAN, OR APPROVED EQUAL ALUMINUM FLOOR HATCH (SEE NOTE 1) ACCESS LADDER (NOTE 2) TOS ELEV. 658.00 PROPOSED GRADE ELEV. 657.00 8" SURGE RELIEF PIPE, FL x PE, PVC SCH 80 16" DI., FL x MJ M N X AB O P LINK SEAL (TYP.) W L T I K H FL ELEV.649.42 FLOOR 647.50 SLOPE FLOOR TO DRAIN @ 2% SLOPE PIPE SUPPORT (TYP.) (SEE DETAIL SHEET C24) NOTE: 1. 2. ALL HATCHES TO BE INSTALLED WITH SAFETY GRATES. ACCESS LADDER TO BE INSTALLED WITH HALLIDAY MODEL L1E LADDER EXTENSION OR SIMILAR. 12' DIA WET WELL (SEE STRUCTURAL SHEETS) 12' - 0" I.D. 10" DISCHARGE 649.67 TOS EL. 658.00 6" STILLING WELL STAINLESS STEEL LIFTING CHAIN STAINLESS STEEL GUIDE RAIL 4" FLAP VALVE 3 PLY EPDM 1.5" ID AIR HOSE HOSE (TYP OF 3) 18" TEE, PVC TRANSITION COUPLING FROM GRAVITY LINE TO SCH 80 PVC 18" INFLUENT PIPE 627.69 HIGH LEVEL ALARM 626.69 LAG BACKUP 626.19 LEAD BACKUP 625.69 PUMP ON (LAG) 625.19 PUMP ON (LEAD) 624.69 18" SCH. 80 PVC DROP PIPE VERTICAL PIPE SUPPORTS AT 8' INTERVALS (SEE NOTE 15 ON SHEET C11) 8" TEE, PVC SCH 80 AC V AD Z F Q G R 2" PVC SCH 80 CAV PIPE 3 PLY EPDM 1.5" ID AIR HOSE HOSE 8" PVC SCH 80 SURGE RELIEF DROP PIPE PIPE SUPPORT (TYP.) (SEE DETAIL SHEET C24) 10" DISCHARGE PIPE FL x FL. DI. PUMP OFF 606.96 LOW LEVEL ALARM 605.96 AE SLOPE AT 1:1 (V:H) PIPE SUPPORT (SEE DETAIL SHEET C24) SUCTION HEAD 600.41 WET WELL BOTTOM 599.74 B ' 1 A D AF 1 1 PIPE SUPPORT (SEE DETAIL SHEET C24) I N M " 5 . 1 " 3 C WET WELL WIZARD (TYP OF 3) 1 LIFT STATION MECHANICAL SECTION 1/4" = 1' - 0" FULL SIZE I I I I N N O O T T P P R R C C S S E E D D N N O O S S V V E E R R I I I I E E T T A A D D Y Y B B . . V V E E R R . . O O N N T E O F TE X A S A S T CHRISTOPHER M. LEAL P R O F E 97373 LICEN S E SSIONA L D E N R G IN EE 10/31/2022 THE SEAL APPEARING ON THIS DOCUMENT WAS AUTHORIZED BY CHRISTOPHER M. LEAL LIC. # 97373 I CERTIFY THAT THESE DRAWINGS ARE COMPLETE, ACCURATE AND ADEQUATE FOR PURPOSES, INCLUDING CONSTRUCTION, BUT ARE NOT AUTHORIZED FOR CONSTRUCTION UNTIL FORMAL CITY APPROVAL. INTENDED THEIR S A X E T , I N T S U A F O Y T C I R E T A W N T S U A I I I I I N O S V D S E C V R E S G N R E E N G N E I I S T N E M E V O R P M I I N O T A T S T F I L A E R A T S E W H T R O N 3 5 . I O N N O T A T S T F I L S L L I H T A E R G I I N O T C E S L A C N A H C E M N O T A T S T F I L I NOTES NOTES NAME NAME DATE DATE SURVEY BY SURVEY BY DRAWN BY DRAWN BY JRW 02/22 DESIGNED BY DESIGNED BY TJK 02/22 CHECKED BY CHECKED BY CML 02/22 REVIEWED BY REVIEWED BY 1 E M A N T E E H S 2 E M A N T E E H S . B T S D S E _ A O C , - - - - , \ I . \ G W D H C E M - 0 6 7 0 \ S T E E H S N G D N G S E D _ S L _ S L L I H _ T A E R G _ A O C _ 0 6 7 0 \ S T C E J O R P \ : X M P 8 4 : 5 3 2 0 2 / 6 / 1 1 N A M D E T S N E K 9009 1/2 SPICEBRUSH DRIVE AUSTIN, TX 78759 CASE NUMBER: SP-2022-0537C SHEET 20 OF 63 C12 TO WET WELL & GENERATOR. SEE SHEET E2 FOR CONTINUATION. GENERAL NOTES: 1. ALL STUB-UP TRANSITIONS FROM DUCTBANKS TO ABOVE GRADE SHALL BE PVC COATED RIGID STEEL PLASTI-BOND, PERMA-COTE, REDH2OT, AS MANUFACTURED BY ROBROY OR REINFORCED THERMOSETTING RESIN CONDUIT AS LISTED IN AWU SPECIFICATIONS 2. MINIMUM DUCTBANK CONDUIT SHALL BE 1". 3. PROVIDE CAPPED WALL PENETRATION ABOVE CRYSTAL BALL FOR FUTURE ANTENNA ROUTING. 4. DUCTBANKS SHALL BE RUN UNDER THE SLAB FROM FIELD DEVICES TO DESIGNATED EQUIPMENT LOCATIONS IN THE ELECTRICAL EQUIPMENT ENCLOSURE. 5. CONDUIT ROUTING SHOWN IS USED FOR CLARIFICATION PURPOSES ONLY. MAINTAIN 3-90 DEGREE BENDS FOR ALL CONDUIT RUNS. EXCEEDING THIS NUMBER OF BENDS SHALL REQUIRE INSTALLING HANDHOLES. 6. REFER TO CITY OF AUSTIN LIFT STATION SPECIFICATIONS, FOR ADDITIONAL INFORMATION ON EQUIPMENT & INSTALLATION REQUIREMENTS. 7. ALL CONDUIT ROUTED WITHIN BUILDING SHALL BE EXPOSED. 8. ALL CONDUIT STUB-UPS IN MCC AND CONTROL PANEL SECTION SHALL BE FILLED WITH POLYWATER FST-250. 9. ALL ELECTRICAL DUCTBANK STEEL SHALL BE TIED INTO STRUCTURAL STEEL. BUBBLER CONTROL PANEL 12 11 2 AE METER INCOMING MAIN MISC. BREAKERS LOW VOLTAGE P1 STARTER P2 STARTER CONTROL PANEL FIT PUMP CONTROLS LSP2 RVAT LSP1 RVAT FIT CB 4 POWER & GROUNDING PLAN 1 SCALE: 1/2" = 1'-0" 13 3 1 SERVICE SPD 'SPD1' PQM 3P-600A MCB SPACE PANEL LP 120/240V 42CKT PANELBOARD XFMR T1 480V- 120/240V 1∅ 2P-30A PB 2P-60A SB SPACE PANEL LP SPD 'SPD2' 3P-20A 3P-20A SPACE SPACE A MCC ELEVATION SCALE: 1/4" = 1'-0" TO WET WELL & GENERATOR. SEE SHEET E2 FOR CONTINUATION. S LP-8,10 LP-4,6 21 LP-19 LP-15 LP-9 BUBBLER CONTROL PANEL 10 LP-9 TS A A A AE METER AE METER 16 LP-7 INCOMING MAIN MISC. BREAKERS LOW VOLTAGE P1 STARTER P2 STARTER CONTROL PANEL LP-20 LP-22 LP-19 LP-21,23 FIT GEN-ANN LSP1-C LSP2-C I-1 6 7 8 INCOMING MAIN MISC. BREAKERS LOW VOLTAGE P1 STARTER P2 STARTER CONTROL PANEL SPD LIGHTING & RECEPTACLE PLAN 2 SCALE: 1/2" = 1'-0" INSTRUMENTATION PLAN 3 SCALE: 1/2" = 1'-0" NOT FOR CONSTRUCTION KEYNOTES: INSTALL #250 MCM GROUND LOOP 2'-6" BELOW GRADE AND 2'-0" AWAY FROM BLDG. FOUNDATION. #3/0 BARE CU. BOND TO GROUND LUG IN SERVICE DISCONNECT. #2/0 BARE COPPER GROUND. BOND TO FOUNDATION AND BUILDING STEEL. TYPICAL 4 PLACES. #3/0 BARE CU. GROUND. BOND TO MCC GROUND BUS AT EACH END. INSTALL BUBBLER TUBING EXPOSED ON WALL INSIDE BLDG. PROVIDE SCH. 80 PVC STUB-UP THROUGH FLOOR FOR SLEEVE. 1PR. #16T/S, 3/4"C FOR WETWELL LEVEL. 2#14, 3/4"C. BUBBLER SOLENOID VALVE. 2#14, 3/4"C. BUBBLER LOW PRESSURE ALARM. 3PR. OUTDOOR TELEPHONE CABLE, 1"C. DEDICATED CIRCUIT FOR AIR COMPRESSOR AND AUTOMATIC DRAIN VALVE.. 3 TON HEAT PUMP. FAN COIL UNIT. 13 CADWELD CONNECTION. SEE DETAIL, SHEET E12. ALARM BEACON AND HORN. INSTALL 8'-0" ABOVE GRADE. ALL CONDUITS ENTERING MCC, SERVICE DISCONNECT AND ATS FROM BELOW GRADE SHALL BE FILLED W/POLYWATER FST-250. SURFACE MOUNT LED FIXTURE. LIGHONIA FEM L24 SERIES, 4000LM M,D 120 40k 80CRI, OR APPROVED EQUAL. 4G/5G COMMUNICATION CONTROL PANEL. MOUNT ON WALL. PROVIDE SINGLE WALL PENETRATION FOR 2 SETS OF COAX CABLE. 19 MOUNT 5G ANTENNAS TO BUILDING ROOF USING UNISTRUT SUPPORT. PROVIDE COAX CABLE SUPPORT, FROM WALL PENETRATION TO ANTENNAS, EVERY 5-'0". 3/4"C: 2#14(P), #12(G) LED EMERGENCY EGRESS FIXTURE. LITHONIA ECRG RDM6. 1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 17 18 20 21 TO WET WELL & GENERATOR. SEE SHEET E2 FOR CONTINUATION. 14 H R BUBBLER CONTROL PANEL 3"C: BUBBLER CABLE 5 20 17 18 FIT 19 NOTES NOTES NAME NAME DATE DATE SURVEY BY SURVEY BY NA N/A DRAWN BY DRAWN BY ESZ 7/6/2021 DESIGNED BY DESIGNED BY ESZ 6/24/2021 CHECKED BY CHECKED BY JRSA 7/02/2021 REVIEWED BY REVIEWED BY ESZ 7/02/2021 JR SA EN G IN EER IN G , IN C. E13 CityView 2, Suite 100 Austin, Texas 78746 P - 512.338.1704 F - 512.338.1784 TBPE Firm #6535 www.kfriese.com SHEET 49 OF 63 Northwest Area Lift Station Improvements Great Hills LiftStation No. 53 (SP-2022-0537C)_________________________________________________60 OF 63Northwest Area Lift Station Improvements Great Hills LiftStation No. 53 (SP-2022-0537C)_________________________________________________