20201104-003b: Concordia University Campus Residence Hall, SP-2020-0038C variance packet Part 2 of 2

Environmental Commission – Nov. 4, 2020

20201104-003b: Concordia University Campus Residence Hall, SP-2020-0038C variance packet Part 2 of 2 — original pdf

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E RIV D R U O B R A H K C O R R O C D O ( 7 K C 0 # ' H 2 R A 0 . 0 O R 0 . B 0 0 W O 0 . 2 5 W U I D R T O H ) D P R T C R I V E R D O O C C # K 2 0 0 H 5 A 0 0 R 2 7 B 5 O O R P R D T C R . EXISTING WALMART PROPERTY EXISTING ALARA APARTMENTS PROPERTY E V I R D Y T I S R E V I N U A I D R O C N O C 00 200' 400' GRAPHIC SCALE 200' PROPERTY LINE LIMITS OF CONSTRUCTION EXISTING SOFTBALL FIELD UNOCCUPIED SPRING D V O R O A L I P R . N T 9 C 0 A 8 G 2 E , P E G A . 6 S 2 5 E M E N T 150' CEF BUFFER 50' CWQZ 150' CEF BUFFER 50' CWQZ 100' WQTZ D R A I N V A O L G . E 9 0 E 8 A 2 S , E M E O P P G R . 6 N T T 2 5 C P D R O E C S # E O 2 R P 0 V R 0 E 7 T T 1 C 0 R 6 A 6 1 3 C T RIM ROCK F L 1 8 " R C R P ( I M S E = ) 9 = 9 5 4 4 8 . . 0 5 ± ± D F R I L M F F L L 1 2 8 = 4 " 9 1 8 " " R 5 R R C P C 3 . C P 2 P ( ± ( ( N S N E E ) W ) = = 9 ) = 9 4 9 4 4 6 6 . . 8 6 8 ± . 8 ± ± D R F I L M 1 = 8 " 9 R 5 C 5 . 0 P ± ( S W ) = 9 5 1 . 1 ± EXISTING BASEBALL FIELD PROPOSED LIMITS OF CONSTRUCTION ET T TT T T T E E ET D R F I L M 1 = 8 " 9 R 3 C P 9 . 4 ± ( S W ) = 9 3 3 . 8 ± 3 8 3 B . 9 L 6 O L O T 5 C 2 A K C A R E S D F R I L M 1 = 0 " 9 R 5 C 5 . P 4 ± ( N W ) = 9 4 9 . 8 ± EE 100' WQTZ JOLLYVILLE PLATEAU SALAMANDER OCCUPIED SPRING UNOCCUPIED SPRING EXISTING RESIDENCE HALLS OVERALL CAMPUS PROPERTY LINE VICINITY MAP N.T.S. EXISTING SITE PLAN Concordia Unviersity Residence Hall July 2020 NOTE: THIS PLAN IS CONCEPTUAL IN NATURE AND HAS BEEN PRODUCED WITHOUT THE BENEFIT OF A SURVEY, TOPOGRAPHY, UTILITIES, CONTACT WITH THE CITY, ETC. DRAINAGE EASEMENT VOL.9082, PG.625 OPRTC 00 200' 400' GRAPHIC SCALE 200' LEGEND LEGEND LIMITS OF CONSTRUCTION FEMA 100-YEAR FLOODPLAIN FEMA 100-YEAR FLOODPLAIN = CoA FULLY DEVELOPED 100-YEAR FLOODPLAIN PROPOSED 100-YEAR FLOODPLAIN (ATLAS 14) PER FLOODPLAIN STUDY DATED 6/30/2020 BY KHA. CREEK CENTERLINE WATER QUALITY TRANSITION ZONE (WQTZ) WATER QUALITY TRANSITION ZONE (WQTZ) CRITICAL WATER QUALITY ZONE (CWQZ) BEHNKEN LANE D A O R N A I L I K LOT 2 BLOCK A 383.965 ACRES LO C PROPOSED HANDRAIL 10' P.U.E. (TO BE VACATED) D A O R N A I L I K C O L S T U D T M E N N C O U R T UP L O C FF = 950.00' L PROPOSED ONE-WAY DROP-OFF O EE C PROPOSED POND L O C LO 20' P.U.E. (DOC NO. ____________) C FF ELEV. = 948.82± T E ET LOC TT LOC HARMS COVE T T T V A N L O C C ET O L LOC 6" CONCRETE CURB (TYP) C O L PROPOSED ENCLOSED DUMPSTERS C O L LOT 2 BLOCK A AMENDED PLAT OF LOTS 2, 3 AND 4 SCHLUMBERGER SUBDIVISION DOC# 200800034 OPRTC LANDSCAPE AREA LOC EXISTING WATER QUALITY POND D.E. DOC#2014152009 LOC C O L L O C LOC C O L JOLLYVILLE PLATEAU SALAMANDER OCCUPIED SPRING PRESERVE TRACT DOC# 2007106613 OPRTC PROPOSED 100-YEAR FLOODPLAIN (ATLAS 14) PER FLOODPLAIN STUDY DATED 6/30/2020 BY KHA. 10' P.U.E. DOC#200000066 O.P.R.T.C. 150' CEF BUFFER DRAINAGE EASEMENT VOL.9082, PG.625 OPRTC ROCK HARBOR DR. DOC# 200500275 OPRTC ROCK HARBOUR DRIVE (70' R.O.W. WIDTH) DOC# 200000025 OPRTC I N A L P E T S L L A R E V O I I Y T S R E V N U A D R O C N O C I L L A H E C N E D S E R I I N T S U A F O Y T C I S A X E T , Y T N U O C S V A R T I SHEET NUMBER 14 OF 43 SP-2020-0038C BENCHMARKS BM #50003 MAG NAIL SET IN TOP OF CURB ON A CIRCULAR MEDIAN LOCATED AT THE INTERSECTION OF TWO DRIVEWAYS 8'± NORTHWEST OF A FLAG POLE AND 36'± NORTHWEST OF A WASTEWATER MANHOLE. · ELEV.=957.97' (NAVD '88) BM #52122 MAG NAIL SET IN THE MIDDLE OF A CONCRETE WALL SOUTH ON THE LIFT STATION 25'± SOUTH OF A STORM SEWER MANHOLE ON A CURB INLET AND 47'± SOUTHEAST OF A WASTEWATER MANHOLE · ELEV.=940.28' (NAVD '88) SITE PLAN APPROVAL 43 SHEET ____OF____ 14 FILE NUMBER__________________APPLICATION DATE_______________ SP-2020-0038C 1/31/2020 APPROVED BY COMMISSION ON_______________UNDER SECTION_______ OF 112 CHAPTER__________OF THE CITY OF AUSTIN CODE. 25-5 JEREMY SILTALA EXPIRATION DATE (25-5-81,LDC)__________CASE MANAGER__________________ PROJECT EXPIRATION DATE (ORD.#970905-A)__________DWPZ______DDZ______ __________________________________________________________________________ Director, Development Services Department RELEASED FOR GENERAL COMPLIANCE:_____________ZONING_____________ R&D-PDA Rev. 1____________________________Correction 1_____________________________ Rev. 2____________________________Correction 2_____________________________ Rev. 3____________________________Correction 3_____________________________ Final plat must be recorded by the Project Expiration Date, if applicable. Subsequent Site Plans which do not comply with the Code current at the time of filing, and all required Building Permits and/or a notice of construction (if a building permit is not required), must also be approved prior to the Project Expiration Date. Know what'sbelow. Call before you dig. WARNING: CONTRACTOR IS TO VERIFY PRESENCE AND EXACT LOCATION OF ALL UTILITIES PRIOR TO CONSTRUCTION. SEDIMENTATION WATER QUALITY/ EXISTING LIVE WATER QUALITY CHANNEL ORANGE ZONE (300 M) EXISTING SOFTBALL FIELD EXISTING BASEBALL FIELD, DUGOUTS, GRANDSTANDS, ETC. 150' CEF SPRING BUFFER 50' CWQZ 100' WQTZ CENTERLINE SOFTBALL FIELD UNDERDRAIN WATER QUALITY PRETREATMENT EXISTING LEVEL SPREADER EXISTING PARTIAL BIO-FILTRATION POND STREAM BUFFER EXISTING DETENTION POND PARKING LOT 150' RIM ROCK CEF BUFFER AND SPRING BUFFER PARTIAL SEDIMENTATION/FILTRATION POND EXISTING PARTIAL SED/FILL POND RED ZONE (80 M) FILTRATION BASIN SEDIMENTATION BASIN DETENTION POND RESIDENCE HALL VAN T T U P JOLLYVILLE SALAMANDER OCCUPIED SPRING PARTIAL BIO-FILTRATION POND 2 ( D 0 ' O P C . U N . E . O . _ _ _ _ _ _ _ _ _ _ _ _ ) B I O F I L T R A T I O N B A S I N S E D I M E N T A T I O N B A S I N D E T E N T I O N P O N D STREAM BUFFER LEVEL SPREADER STREAM BUFFER 00 100' 200' GRAPHIC SCALE 100' LEGEND LIMITS OF CONSTRUCTION ENDANGERED SPECIES PROTECTION PLAN THE JOLLYVILLE PLATEAU SALAMANDER OCCUPIES A SPRING LOCATED ON THE CONCORDIA UNIVERSITY TEXAS PROPERTY AND IS LOCATED +/-800 FEET WEST OF THE SOFTBALL FIELD IN A NATURAL DRAINAGE CHANNEL LOCATED IN EXISTING PRESERVE LANDS OWNED BY CONCORDIA AND MANAGED BY TRAVIS COUNTY. THE ENGINEER, THE OWNER, AND ENVIRONMENTAL CONSULTANT, ACI, HAVE MET WITH USFWS AND THE CITY OF AUSTIN (COA) TO WORK TOGETHER IN DETERMINING AN EFFECTIVE SOLUTION FOR PROTECTING THE JOLLYVILLE PLATEAU SALAMANDER. THIS SALAMANDER IS LISTED AS AN ENDANGERED SPECIES. IMPLEMENTING THE MEASURES REQUIRED IN THE CITY OF GEORGETOWN'S WATER QUALITY MANAGEMENT PLAN (WQMP) EXHIBIT 'A' WAS DISCUSSED WITH THE USFWS AND CITY OF AUSTIN AS PROVIDING SUFFICIENT PROTECTION FOR THE SALAMANDER. IN ORDER TO COMPLY WITH THE WQMP AND TO PROVIDE ADDITIONAL PROTECTION FOR THE SALAMANDER SPRING SITE, THE FOLLOWING HAS BEEN IMPLEMENTED INTO THIS SITE PLAN: 1. BUFFERS: a. NO DEVELOPMENT IS PROPOSED IN THE “RED ZONE.” (80M UP AND DOWN STREAM FROM CENTER OF SPRING). b. THE DEVELOPMENT IS PROPOSED OUTSIDE OF THE “ORANGE ZONE” (300M FROM CENTER OF SPRING). c. 100-FOOT STREAM BUFFERS FROM CENTERLINE HAVE BEEN PROVIDED, WHICH COINCIDE WITH THE CITY OF AUSTIN WATER QUALITY TRANSITION ZONE. 2. WATER QUALITY: a. A LIVE CHANNEL THAT MEETS THE TCEQ REQUIREMENTS FOR CHANNEL DESIGN HAS BEEN INCLUDED TO PROVIDE “PRETREATMENT” FOR THE ROADS AND THE BUILDING. THIS CHANNEL PROVIDES ADDITIONAL WATER QUALITY OVER AND ABOVE WHAT IS REQUIRED TO MEET CITY OF AUSTIN WATER QUALITY REQUIREMENTS. b. A PARTIAL/SEDIMENTATION FILTRATION POND HAS BEEN PROVIDED MEETING 100% OF THE REQUIRED WATER QUALITY FOR THE DEVELOPMENT OF THE ROADS AND THE BUILDING, MEETING CITY OF AUSTIN REQUIREMENTS. c. PARTIAL BIO-FILTRATION PONDS ARE PROVIDED MEETING 100% OF THE REQUIRED WATER QUALITY FOR THE DEVELOPMENT OF THE PARKING LOT, RESIDENCE HALL, AND ANCILLARY SITE IMPROVEMENTS, MEETING CITY OF AUSTIN REQUIREMENTS. d. EXTENSIVE LEVEL SPREADERS (INCLUDING DEEP ROOTED SWITCH GRASS, STILLING BASINS, AND BIG MUHLY) HAVE BEEN PROVIDED TO REDUCE VELOCITIES FROM CONVEYANCE AREAS DISCHARGING CONCENTRATED RUNOFF. 3. WATER QUANTITY: a. OFFSITE FLOWS ARE CONVEYED THROUGH THE SITE FOLLOWING NATURAL DRAINAGE PATTERNS AS MUCH AS PRACTICABLE. BENCHMARKS BM #50003 MAG NAIL SET IN TOP OF CURB ON A CIRCULAR MEDIAN LOCATED AT THE INTERSECTION OF TWO DRIVEWAYS 8'± NORTHWEST OF A FLAG POLE AND 36'± NORTHWEST OF A WASTEWATER MANHOLE. · ELEV.=957.97' (NAVD '88) BM #52122 MAG NAIL SET IN THE MIDDLE OF A CONCRETE WALL SOUTH ON THE LIFT STATION 25'± SOUTH OF A STORM SEWER MANHOLE ON A CURB INLET AND 47'± SOUTHEAST OF A WASTEWATER MANHOLE · ELEV.=940.28' (NAVD '88) U A E T A L P E L L I V Y L L O J R E D N A M A L A S I N A L P N O T C E T O R P I I Y T S R E V N U A D R O C N O C I L L A H E C N E D S E R I I N T S U A F O Y T C I S A X E T , Y T N U O C S V A R T I SHEET NUMBER 20 OF 43 SP-2020-0038C SITE PLAN APPROVAL 43 SHEET ____OF____ 20 FILE NUMBER__________________APPLICATION DATE_______________ SP-2020-0038C 1/31/2020 APPROVED BY COMMISSION ON_______________UNDER SECTION_______ OF 112 CHAPTER__________OF THE CITY OF AUSTIN CODE. 25-5 JEREMY SILTALA EXPIRATION DATE (25-5-81,LDC)__________CASE MANAGER__________________ PROJECT EXPIRATION DATE (ORD.#970905-A)__________DWPZ______DDZ______ __________________________________________________________________________ Director, Development Services Department RELEASED FOR GENERAL COMPLIANCE:_____________ZONING_____________ R&D-PDA Rev. 1____________________________Correction 1_____________________________ Rev. 2____________________________Correction 2_____________________________ Rev. 3____________________________Correction 3_____________________________ Final plat must be recorded by the Project Expiration Date, if applicable. Subsequent Site Plans which do not comply with the Code current at the time of filing, and all required Building Permits and/or a notice of construction (if a building permit is not required), must also be approved prior to the Project Expiration Date. Know what'sbelow. Call before you dig. WARNING: CONTRACTOR IS TO VERIFY PRESENCE AND EXACT LOCATION OF ALL UTILITIES PRIOR TO CONSTRUCTION. E RIV D R U O B R A H K C O R R O C D O ( 7 K C 0 # ' H 2 R A 0 . 0 O R 0 . B 0 0 W O 0 . 2 5 W U I D R T O H ) D P R T C R I V E R D O O C C # K 2 0 0 H 5 A 0 0 R 2 7 B 5 O O R P R D T C R . EXISTING WALMART PROPERTY EXISTING ALARA APARTMENTS PROPERTY E V I R D Y T I S R E V I N U A I D R O C N O C 00 200' 400' GRAPHIC SCALE 200' PROPERTY LINE LIMITS OF CONSTRUCTION EXISTING SOFTBALL FIELD UNOCCUPIED SPRING D V O R O A L I P R . N T 9 C 0 A 8 G 2 E , P E G A . 6 S 2 5 E M E N T EXISTING BASEBALL FIELD PROPOSED LIMITS OF CONSTRUCTION OVERALL CAMPUS PROPERTY LINE 150' CEF BUFFER 50' CWQZ 150' CEF BUFFER 50' CWQZ 100' WQTZ D R A I N V A O L G . E 9 0 E 8 A 2 S , E M E O P P G R . 6 N T T 2 5 C P D R O E C S # E O 2 R P 0 V R 0 E 7 T T 1 C 0 R 6 A 6 1 3 C T RIM ROCK ET II II T TT T IIIIII T T T E E ET D R F I L M 1 = 8 " 9 R 3 C P 9 . 4 ± ( S W ) = 9 3 3 . 8 ± F L 1 8 " R C R P ( I M S E = ) 9 = 9 5 4 4 8 . . 0 5 ± ± D F R I L M F F L L 1 2 8 = 4 " 9 1 8 " " R 5 R R C P C 3 . C P 2 P ( ± ( ( N S N E E ) W ) = = 9 ) = 9 4 9 4 4 6 6 . . 8 6 8 ± . 8 ± ± D R F I L M 1 = 8 " 9 R 5 C 5 . 0 P ± ( S W ) = 9 5 1 . 1 ± BM #50003 ELEV.=957.97' 3 8 3 B . 9 L 6 O L O T 5 C 2 A K C A R E S D F R I L M 1 = 0 " 9 R 5 C 5 . P 4 ± ( N W ) = 9 4 9 . 8 ± BM #52122 ELEV.=940.28' 2 ( D 0 ' O P C . U . N E . O . _ _ _ _ _ _ _ _ _ _ _ _ ) EE 100' WQTZ JOLLYVILLE PLATEAU SALAMANDER OCCUPIED SPRING UNOCCUPIED SPRING EXISTING RESIDENCE HALLS VICINITY MAP N.T.S. CONTEXT MAP Concordia Unviersity Residence Hall July 2020 NOTE: THIS PLAN IS CONCEPTUAL IN NATURE AND HAS BEEN PRODUCED WITHOUT THE BENEFIT OF A SURVEY, TOPOGRAPHY, UTILITIES, CONTACT WITH THE CITY, ETC. October 20, 2020 City of Austin Planning and Development Review Department 505 Barton Springs Road Austin, TX 78767 Re: Variance Request Letter – Cut Concordia University Residence Hall - Site Plan Application SP-2020-0038C 11400 Concordia University Drive Austin, Texas 78726 To Whom It May Concern: INTRODUCTION Please accept this letter as a request for a variance to the Lake Austin Ordinance #840301- F, Sections 9-10-409(A) and 9-10-409(B) for a max cut of +/- 8.74 ft for the above referenced project. PROJECT DESCRIPTION The Concordia University Texas campus is an existing campus located at 11400 Concordia University Drive in northwest Austin, Texas and Travis County. The existing property is approximately 383 acres including approximately 250 acres of preserve land. The campus has existing improvements including buildings, athletic facilities, private drives, underground utilities storm drains, stormwater ponds, and auxiliary improvements. The proposed campus improvements include a 4-story residence hall building, associated parking lot, outdoor amphitheater area, pedestrian improvements, two water quality and detention ponds, and associated site improvements. This project is located within the Bull Creek Watershed, classified as a Water Supply Suburban Watershed. The site is located within the Edwards Aquifer Recharge Zone according to the City of Austin GIS. Critical water quality zones, water quality transition zones, and critical environmental features are located on the southern and eastern portion of the site. No development will occur in these locations. The terrain is heavily wooded and has some grass cover. kimley-horn.com 10814 Jollyville Road, Bldg. 4, Suite 200, Austin, TX 78759 512 418 1771 No requests for a variance to CEF buffers, WQTZ or CWQZ areas are being requested. If you have any questions or comments regarding this request, please contact me at 512-271- 6314. Page 2 Sincerely, Brandon Hammann, P.E., LEED AP Project Manager kimley-horn.com 10415 Morado Circle, Bldg. I, Suite 300, Austin, TX 78759 512 418 1771 BEHNKEN LANE EXISTING BUILDING D A O R N A I L I K 50714 SF IP 50715 50716 D A O R N A I L I K BM #50003 ELEV.=957.97' SF LOT 2 BLOCK A 383.965 ACRES 51126 51084 51085 51083 51082 5108051081 51017 51016 51015 51014 50985 51266 50989 50969 50967 51049 S T U D T M A N N C O U R T 51221 51276 51277 51278 CONSTRUCTION ENTRANCE UP 50880 50881 50433 50431 50435 50436 50438 50439 D RIM = 955.4± FL 10"RCP(NW)=949.8± 50456 CW SA 50429 50427 50460 50459 50426 50424 50462 50423 8 INCHES OF HARDWOOD MULCH SHALL BE APPLIED FROM THE 1 2 CRZ TO THE FULL CRZ. E E 51288 ML 51340 51252 51257 51259 51260 51255 51258 51250 51344 51404 ML 51400 RB 8 INCHES OF HARDWOOD MULCH SHALL BE APPLIED FROM THE 1 2 CRZ TO THE FULL CRZ. DS 51419 SEDIMENTATION BASIN DETENTION POND 51426 51424 ML 51428 51427 51431 51452 51451 51450 51449 51462 51460 RB 51434 51438 51439 51448 51458 51443 51447 ML 5144551446 51442 8 INCHES OF HARDWOOD MULCH SHALL BE APPLIED FROM THE 1 2 CRZ TO THE FULL CRZ. 50441 50466 50461 50454 50465 50452 50445 50443 50444 50451 50467 50447 50412 50448 50416 50409 50410 50407 50421 50415 50413 51225 51238 51237 51236 51234 51233 51239 51241 51244 51243 BIOFILTRATION BASIN 50419 51230 51480 51482 51228 51229 J-HOOK (TYP.) 51477 51478 5047050471 50381 50473 50475 50476 50479 50384 50382 50406 50405 50403 51475 50399 50397 20' P.U.E. (DOC NO. ____________) 51479 50482 50358 50387 8 INCHES OF HARDWOOD MULCH SHALL BE APPLIED FROM THE 1 2 CRZ TO THE FULL CRZ. 50400 FF ELEV. = 948.82± 50388 50391 50395 T T V A N T HARMS COVE E SF E T D IIIIII 50135 T FD T 50136 RIM = 939.4± FL 18"RCP(SW)=933.8± 50038 BM #52122 ELEV.=940.28' SF 51492 50337 50335 50338 5033950340 50343 50345 T E SF 51572 51571 51603 51604 TP 51657 51606 51653 51652 51688 51663 51608 51612 51650 51614 51649 51610 51660 51665 51661 51689 51686 51668 51670 SF 51640 51616 51619 51639 51620 51635 51623 51622 51634 51638 51636 51625 5164451645 51629 5162751628 51642 51694 51632 51630 51691 51683 51676 51672 51673 51674 51692 51681 51677 51717 51682 51680 51679 51722 51718 51724 51723 51519 51727 51728 CONSTRUCTION ENTRANCE 51934 51935 51936 51946 51945 51695 51698 51699 51700 51711 51714 51712 51709 SA CW 51706 51703 51705 51708 A SIN N B TIO A T N E DIM E S D N O N P TIO N E T E D DS 51910 51907 51913 51912 SIN A N B 51904 51906 TIO 51903 A R T FIL RIM = 955.0± FL 18"RCP(SW)=951.1± D 5196351964 51987 51988 51989 IP RIM = 954.0± FL 18"RCP(SE)=948.5± IP D RIM = 953.2± FL 18"RCP(NE)=946.8± FL 24"RCP(SE)=946.8± FL 18"RCP(NW)=946.8± 00 40' 80' GRAPHIC SCALE 40' 710 710 LEGEND EXISTING CONTOUR PROPOSED CONTOUR LIMITS OF CONSTRUCTION SILT FENCE - SEE DETAIL ON SHEET 11. CONSTRUCTION ENTRANCE - SEE DETAIL ON SHEET 11. STAGING AND SPOILS AREA. CONCRETE WASHOUT PIT - SEE DETAIL ON SHEET 11. TREE PROTECTION - SEE DETAIL ON SHEET 11. INLET PROTECTION - SEE DETAIL ON SHEET 11. TRIANGULAR FILTER DIKE - SEE DETAIL ON SHEET 11. DEWATERING SKIMMER - SEE DETAIL ON SHEET 11. MULCH SOCK - SEE DETAIL ON SHEET 11 TREE TO REMAIN TREE TO BE REMOVED NOTES: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. REFER TO EROSION AND SEDIMENTATION CONTROL AND TREE PROTECTION DETAILS, SHEET 11. ALL TREES 8" AND GREATER IN SIZE HAVE BEEN SURVEYED. ONLY THOSE TREES 19" AND LARGER ARE CONSIDERED PROTECTED PER ORDINANCE NO. 83-0324-N, AND CROSS-REFERENCED IN THE PDA ORDINANCE FOR THIS PROPERTY (850131-Q). CONTRACTOR IS RESPONSIBLE FOR IMPLEMENTATION, MAINTENANCE, AND EFFECTIVENESS OF ALL SWPPP CONTROLS - CONTROLS SHOWN ON THIS SITE MAP ARE SUGGESTED CONTROLS ONLY. CONTRACTOR SHALL RECORD INSTALLATION, MAINTENANCE OR MODIFICATION, AND REMOVAL DATES FOR EACH BMP EMPLOYED (WHETHER CALLED OUT ON ORIGINAL SWPPP OR NOT) DIRECTLY ON THE SITE MAP. THE ENVIRONMENTAL INSPECTOR HAS THE AUTHORITY TO ADD AND/OR MODIFY EROSION/SEDIMENTATION CONTROLS ON SITE TO KEEP PROJECT IN COMPLIANCE WITH THE CITY OF AUSTIN RULES AND REGULATIONS [LDC 25-8-183] CONTRACTOR SHALL UTILIZE DUST CONTROL MEASURES DURING SITE CONSTRUCTION SUCH AS IRRIGATION TRUCKS AND MULCHING AS PER ECM 1.4.5(A) OR AS DIRECTED BY THE ENVIRONMENTAL INSPECTOR. TEMPORARY AND PERMANENT STABILIZATION PRACTICES AND BMP'S SHALL BE INSTALLED AT THE EARLIEST POSSIBLE TIME DURING THE CONSTRUCTION SEQUENCE. AS AN EXAMPLE, PERIMETER SILT FENCE SHALL BE INSTALLED BEFORE COMMENCEMENT OF ANY GRADING ACTIVITIES. OTHER BMP'S SHALL BE INSTALLED AS SOON AS PRACTICABLE AND SHALL BE MAINTAINED UNTIL FINAL SITE STABILIZATION IS ATTAINED. CONTRACTOR SHALL ALSO REFERENCE CIVIL AND LANDSCAPE PLANS SINCE PERMANENT STABILIZATION IS PROVIDED BY LANDSCAPING, THE BUILDING(S), AND SITE PAVING. BMP'S HAVE BEEN LOCATED AS INDICATED ON THIS PLAN IN ACCORDANCE WITH GENERALLY ACCEPTED ENGINEERING PRACTICES IN ORDER TO MINIMIZE SEDIMENT TRANSFER. FOR EXAMPLE: SILT FENCES LOCATED AT TOE OF SLOPE AND INLET PROTECTION FOR INLETS RECEIVING SEDIMENT FROM SITE RUN-OFF. ADDITIONAL EROSION AND SEDIMENTATION CONTROLS MAY BE REQUIRED BY THE CITY DURING CONSTRUCTION. IF DISTURBED AREA IS NOT TO BE WORKED ON FOR MORE THAN 14 DAYS, DISTURBED AREA NEEDS TO BE STABILIZED BY REVEGETATION, MULCH, TARP OR REVEGETATION MATTING [ECM 1.4.4.B.3, SECTION 5, I.]. THE CONTRACTOR WILL CLEAN UP SPOILS THAT MIGRATE ONTO THE ROADS A MINIMUM OF ONCE DAILY [ECM 1.4.4.D.4]. USE J-HOOKS WHERE SILT FENCE CANNOT BE INSTALLED PARALLEL TO THE EXISTING CONTOURS. THE CONTRACTOR WILL CLEAN UP SPOILS THAT MIGRATE ONTO THE ROADS A MINIMUM OF ONCE DAILY. [ECM 1.4.4.D.4] INLET PROTECTION GEOTEXTILE FABRIC SHALL MEET THE SPECIFICATIONS LISTED IN SECTION 1.4.5.9, INLET PROTECTION, OF THE CITY OF AUSTIN ENVIRONMENTAL CRITERIA MANUAL. CONTRACTOR SHALL BE RESPONSIBLE FOR SUBMITTAL OF N.O.I., N.O.T. AND ANY ADDITIONAL INFORMATION REQUIRED BY THE TCEQ CONTRACTOR SHALL COMPLY WITH ALL TCEQ STORMWATER POLLUTION PREVENTION REQUIREMENTS. INSPECTIONS SHALL BE MADE WEEKLY AND AFTER RAIN STORM EVENTS TO INSURE THAT THE DEVICES ARE FUNCTIONING PROPERLY. WHEN SEDIMENT OR MUD HAS CLOGGED THE VOID SPACES BETWEEN STONES OR MUD IS BEING TRACKED ONTO A PUBLIC ROADWAY THE AGGREGATE PAD MUST BE WASHED DOWN OR REPLACED. RUNOFF FROM THE WASH DOWN OPERATION SHALL NOT BE ALLOWED TO DRAIN DIRECTLY OFF SITE WITHOUT FIRST FLOWING THROUGH ANOTHER BMP TO CONTROL OFF SITE SEDIMENTATION. PERIODIC RE-GRADING OR THE ADDITION OF NEW STONE MAY BE REQUIRED TO MAINTAIN THE EFFICIENCY OF THE DEVICES. EROSION CONTROL DEVICES SHOWN ON THIS PLAN SHALL BE INSTALLED PRIOR TO THE START OF LAND DISTURBING ACTIVITIES ON THE PROJECT. ALL EROSION CONTROL DEVICES ARE TO BE INSTALLED IN ACCORDANCE WITH THE APPROVED PLANS FOR THIS PROJECT, AND NCTCOG SPECIFICATIONS. CHANGES ARE TO BE APPROVED BEFORE CONSTRUCTION BY THE DESIGN ENGINEER AND THE CITY/COUNTY ENGINEERING DIVISION. IF THE EROSION CONTROL PLAN AS APPROVED CANNOT CONTROL EROSION AND OFF-SITE SEDIMENTATION FROM THE PROJECT, THE EROSION CONTROL PLAN WILL BE REQUIRED TO BE REVISED AND/OR ADDITIONAL EROSION CONTROL DEVICES WILL BE REQUIRED ON SITE. 21. 20. OFF-SITE BORROW AND SPOIL AREAS ARE CONSIDERED AS PART OF THE PROJECT SITE, AND MUST ALSO COMPLY WITH THE EROSION CONTROL REQUIREMENTS FOR THIS PROJECT. THIS INCLUDES THE INSTALLATION OF BMPs TO CONTROL OFFSITE SEDIMENTATION AND THE ESTABLISHMENT OF PERMANENT GROUND COVER ON DISTURBED AREAS PRIOR TO FINAL APPROVAL OF THE PROJECT. IN ORDER TO COMPLY WITH THE UNITED STATES ENVIRONMENTAL PROTECTION AGENCY AND ALL OTHER AGENCIES HAVING JURISDICTION, THE CONTRACTOR SHALL PROVIDE ANY ADDITIONAL EROSION OR POLLUTION DEVICES, AS REQUIRED, DURING CONSTRUCTION. FILING OF N.O.I. (PER TCEQ REQUIREMENTS) SHALL BE RESPONSIBILITY OF THE CONTRACTOR AND THE OWNER. TREES PROPOSED TO BE PRESERVED MUST MEET THE FOLLOWING CRITERIA: · A MINIMUM OF 50% OF THE CRITICAL ROOT ZONE MUST BE PRESERVED AT NATURAL GRADE, WITH NATURAL 22. GROUND COVER. 2 CRITICAL ROOT ZONE TO THE 1 · CUT OR FILL IS LIMITED TO 4 INCHES FROM THE 1 · NO CUT OR FILL IS PERMITTED WITHIN THE 1 CONTRACTOR SHALL MAINTAIN THE DEWATERING SYSTEM TO ENSURE PERFORMANCE. IF THE DEWATERING SYSTEM IS NOT PERFORMING, THE CONTRACTOR MUST IMMEDIATELY MAKE THE NECESSARY MODIFICATIONS, FOLLOWING THE ENVIRONMENTAL INSPECTOR'S DIRECTION TO ENSURE ADEQUATE SYSTEM PERFORMANCE. CONTRACTOR SHALL PROVIDE THE DEWATERING PLAN AT THE PRECONSTRUCTION MEETING. THE CONTRACTOR IS RESPONSIBLE FOR REMOVING ANY SEDIMENT TRANSPORTED FROM THE LOC TO THE OFFSITE DETENTION/WATER QUALITY POND(S). 4 CRITICAL ROOT ZONE; AND 4 CRITICAL ROOT ZONE. 22. 23. 24. NO AREAS IN EXCESS OF 2:1 SLOPES ARE ANTICIPATED POST-CONSTRUCTION. D N A N O S O R E I I N O T A T N E M D E S I E E R T D N A L O R T N O C I N A L P N O T C E T O R P I I Y T S R E V N U A D R O C N O C I L L A H E C N E D S E R I I N T S U A F O Y T C I S A X E T , Y T N U O C S V A R T I SHEET NUMBER 10 OF 43 SP-2020-0038C BENCHMARKS BM #50003 MAG NAIL SET IN TOP OF CURB ON A CIRCULAR MEDIAN LOCATED AT THE INTERSECTION OF TWO DRIVEWAYS 8'± NORTHWEST OF A FLAG POLE AND 36'± NORTHWEST OF A WASTEWATER MANHOLE. · ELEV.=957.97' (NAVD '88) BM #52122 MAG NAIL SET IN THE MIDDLE OF A CONCRETE WALL SOUTH ON THE LIFT STATION 25'± SOUTH OF A STORM SEWER MANHOLE ON A CURB INLET AND 47'± SOUTHEAST OF A WASTEWATER MANHOLE · ELEV.=940.28' (NAVD '88) SITE PLAN APPROVAL 43 SHEET ____OF____ 10 FILE NUMBER__________________APPLICATION DATE_______________ SP-2020-0038C 1/31/2020 APPROVED BY COMMISSION ON_______________UNDER SECTION_______ OF 112 CHAPTER__________OF THE CITY OF AUSTIN CODE. 25-5 JEREMY SILTALA EXPIRATION DATE (25-5-81,LDC)__________CASE MANAGER__________________ PROJECT EXPIRATION DATE (ORD.#970905-A)__________DWPZ______DDZ______ __________________________________________________________________________ Director, Development Services Department RELEASED FOR GENERAL COMPLIANCE:_____________ZONING_____________ R&D-PDA Rev. 1____________________________Correction 1_____________________________ Rev. 2____________________________Correction 2_____________________________ Rev. 3____________________________Correction 3_____________________________ Final plat must be recorded by the Project Expiration Date, if applicable. Subsequent Site Plans which do not comply with the Code current at the time of filing, and all required Building Permits and/or a notice of construction (if a building permit is not required), must also be approved prior to the Project Expiration Date. Know what'sbelow. Call before you dig. WARNING: CONTRACTOR IS TO VERIFY PRESENCE AND EXACT LOCATION OF ALL UTILITIES PRIOR TO CONSTRUCTION.