B-05 (SP-2020-0093DS - 1112 W. Annie Street; District 9).pdf

Planning Commission – Nov. 10, 2020

B-05 (SP-2020-0093DS - 1112 W. Annie Street; District 9).pdf — original pdf

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SITE PLAN REVIEW SHEET ENVIRONMENTAL VARIANCE REQUEST ONLY P.C. COMMISSION DATE: November 10, 2020 CASE: SP-2020-0093DS COUNCIL DISTRICT: District #9 PROJECT NAME: 1112 W. Annie Street APPLICANT: Atwell, LLC ADDRESS OF SITE: 1112 W. Annie Street COUNTY: Travis WATERSHED: West Bouldin Creek EXISTING ZONING: SF-3-NP PROPOSED DEVELOPMENT: A residential driveway / bridge to cross over West Bouldin Creek. DESCRIPTION OF VARIANCE: The applicant requests the following: JURISDICTION: Full Purpose AGENT: Mark Zupan AREA: 0.1455  Request to vary from LDC 25-8-261 – to allow development inside the Critical Water Quality Zone. STAFF RECOMMENDATION: Staff recommends this variance, having determined that the required findings of fact have been met. Staff recommends with the following conditions:  Restore any damage caused during construction to the City erosion control infrastructure up to the standards shown in the West Bouldin Creek at West Annie Street Stream Restoration Project GP- 2014-0593.WPD.  Provide a planting plan requiring City standard specification 609S Native Seeding and Planting within the critical water quality zone. ENVIRONMENTAL BOARD ACTION: 10/21/2020: The Environmental Board voted in (7) favor for the approval of the requested variance, (0) in denial of the requested variance, (4) absentia. ZONING AND PLATTING COMMISSION ACTION: ENVIRONMENTAL REVIEW STAFF: Hank Marley CASE MANAGER: Anaiah Johnson PHONE: 512-974-2067 PHONE: 512-974-2932 1 of 45B-5 ENVIRONMENTAL COMMISSION MOTION 20201021-004a Date: October 21, 2020 Subject: SP-2020-0093DS at 1112 West Annie St. Motion by: Kevin Ramberg Seconded by: Peggy Maceo RATIONALE: WHEREAS, the Environmental Commission recognizes the applicant is requesting a variance from LDC 25- 8-261 to allow development inside the critical water quality zone; and WHEREAS, the Environmental Commission recognizes that staff recommends this variance with conditions having determined the required Findings of Fact have been met. THEREFORE, the Environmental Commission recommends the variance request with the following: Staff Conditions: 1. Restore any damage caused during construction to the City erosion control infrastructure up to the standards shown in the West Bouldin Creek at West Annie Street Stream Restoration Project GP-2014-0593.WPD. 2. Provide a planting plan requiring City standard specification 609S Native Seeding and Planting within the critical water quality zone. VOTE 7-0 For: Bedford, Smith, Neely, Coyne, Maceo, Ramberg, and Gordon Against: None Abstain: None Recuse: None Absent: Creel, Nill, Thompson, and Guerrero Approved By: Linda Guerrero, Environmental Commission Chair 1 2 of 45B-5Development Services Department Staff Recommendations Concerning Required Findings Project Name: 1112 W. Annie Street; SP-2020-0093DS Ordinance Standard: Watershed Protection Ordinance Variance Request: To allow development inside the Critical Water Quality Zone (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 site is located in the Bouldin Creek Neighborhood Planning Area and has a single family zoning designation similar to the immediate surrounding areas. The proposed bridge crossing is to gain access to a larger lot located on the other side of West Bouldin Creek. This is the lot where the owner intends to build their home. That lot is 0.5290 acres and the majority of it is outside of the 100 year floodplain and critical water quality zone. The proposed bridge crossing is the only access point that the owner has to the City ROW, as the lot is entirely enclosed within West Bouldin Creek, other single family lots and the train track that runs the entire length of the Western perimeter. By not allowing the proposed bridge 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. 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; 3 of 45B-5The proposed bridge over West Bouldin Creek is the only access point that the owner has from City ROW to their buildable lot. The proposed bridge has been designed to take the most direct path across the creek while also minimizing, to the maximum extent feasible, disturbance to the critical water quality zone and avoiding disturbance to the critical root zone of tree #002, which is an existing 20” pecan tree that is located on adjacent City property (See Figure 1). Furthermore, the design also avoids the removal of trees #004, 006 and 007, all of which are Pecan species located on the project property (See Figure 1). Moreover, the proposed location of the bridge also adheres to the minimum 5 foot side yard & 25 foot front yard setback requirements in accordance with LDC 25-2-513 & 492 (See Figure 1). Therefore, the variance is not necessitated by the scale, layout, construction method, or other design decision made by the applicant. b) c) Is the minimum deviation from the code requirement necessary to allow a reasonable use of the property; The proposed bridge has been designed to span the 100 year floodplain. It has also been designed to remove the least amount of protected sized trees located on site and also avoids disturbance of the critical root zone of the larger 20” pecan tree that is located on adjacent City property. Therefore, staff agrees that the design and location of the proposed bridge is the minimum deviation from code requirement necessary to allow a reasonable use of the property. Does not create a significant probability of harmful environmental consequences. The proposed bridge has been designed to span the 100 year floodplain. During construction there is some expected disturbance to the creek and the City erosion control within the vicinity of the proposed bridge crossing. The developer is required to clean and remove any construction debris from within the creek. They are also required to make repairs and restore the City erosion control infrastructure that may become destabilized during the construction of the bridge. Furthermore, all areas of the critical water quality zone that are located within the limits of construction will require City standard and specification 609S – Native Seeding and Planting. Therefore, the variance does not create a significant probability of harmful environmental consequences. Yes Yes Yes 3. Development with the variance will result in water quality that is at least equal to the water quality achievable without the variance. 4 of 45B-5Yes As this proposed bridge has been designed to span the 100 year floodplain there will not be any obstructions within the waterway. Due to the increase in impervious cover being less than 8,000 square feet the project does not require water quality treatment in accordance with City code. However, City standard specification 609S – Native Seeding and Planting is required within the limits of construction. Therefore, development with the variance will result in water quality that is at least equal to the water quality achievable without the variance. Staff Determination: Staff determines that the findings of fact have been met. Staff recommends the following conditions:  Restore any damage caused during construction to the City erosion control infrastructure up to the standards shown in the West Bouldin Creek at West Annie Street Stream Restoration Project – GP-2014-0593.WPD. Provide a planting plan requiring City standard specification 609S – Native Seeding and Planting within the critical water quality zone.  Environmental Reviewer (DSD) _____________________________ (Hank Marley) 9/30/2020 Environmental Review Manager (DSD) _____________________________ 9/30/2020 (Mike McDougal) Environmental Officer (WPD) _____________________________ (Chris Herrington) 10/07/2020 Hank Marley5 of 45B-5 Figure 1 6 of 45B-57 of 45B-58 of 45B-59 of 45B-510 of 45B-511 of 45B-512 of 45B-513 of 45B-514 of 45B-515 of 45B-516 of 45B-517 of 45B-518 of 45B-519 of 45B-5R E F F U D B R A Z A N H S I O O R 1 0 0' E W W W A STE W ATE R V O L. 11900 P G 840 E A S E M E N T R.P.R.T.C.TX. W W 011 010 W W W W 25' - 0" SETBACK SF LOC LOC SF LOC P T 008 T P 009 T P SILT FENCE END 007 T P WITH CAP STAMPED "SEELIG" W W TP TP W W TP T P WITH CAP STAMPED "SEELIG" T P W W T P T P P T 19.86' W W P T SF LOC 005 T P TP N 70°35'43" W 42.17' L O C F S W W W W L O C F S 3-FT WIDE COFFER DAM SEVERE SERVICE ROCK BERM ENCAPSULATED IN IMPERMEABLE GEOMEMBRANE. W W W W L O C F S MH 118977 ON-SITE SEDIMENT LADEN WATER SHALL BE PUMPED AND TREATED USING DEWATERING FILTER BAG W W L O C F S K C A B T E 5' - 0" S 2' 1.3 9 ~ L O C F S 8" E 3'0 8°0 N 2 10-FT WIDE BULL ROCK BERM USED FOR ACCESS. L O C F S L O C ℄ 0) 2 0 0-0 9 9 W W G (S-1 4" F 2 W W ODPLAIN C.W.Q.Z. W W COA FULLY DEVELOPED FLO FEMA 100 YEAR FLO L W W W W W OD PLAIN W W LOT 8 W L W W W L W L W L W L W L W L W L W W W W T P CONCRETE WASHOUT STAGING AND SPOILS AREA F S TP L O C TP S E 25' - 0" T B A C K S F S F F S F S P T L O C P T LOT 7 E RIV E D T E R C N O C F 6 S 0 3 W W NAIL SET AT BASE OF TREE INLET PROTECTION T P 001 W L W W W L F H 1 6 4 8 3 1 W L WL W L T P L O C 6 " W L ( N O T S H O W N O N S V C I N T 1 8 5 8 3 ) A W U L O C W W W L WL LOC STABILIZED CONSTRUCTION ENTRANCE W L C.W.Q.Z. W L M H 2 7 3 8 2 W W W W W L AWU WTR INT: 18583 AWU WW PROF: A180 W. ANNIE STREET (R.O.W. VARIES) WL WW L W WL WL WL W L W W 8" SDR-26 PVC (S-2007-0004) 4" PVC (W322.1-701-95) WL WL WL WL WW M H 1 1 8 9 8 7 W W W W W W W W W W W W W W W W W W I E G D R B L E E T S & K C E D E T E R C N O C F S 2 9 8 SF T P 003 F S T P T P S F P T 004 5' - 0" S 2' 4.2 C O 9 L 8" W ~ 3'0 8°0 002 S 2 C O L P T P T C O L TP T P F S C O L T P F S C O L F S C O L SILT FENCE START LOT 6 SQUARE HEAD BOLT FOUND I Z E N T R A M S O L R A C M A 9 1 : 6 0 2 0 2 / 5 1 / \ I I . \ - 0 1 G W D C S E E N N A N O T C U R T S N O C T H S N G S E D E N N A 2 1 1 1 X T A N A B R U E T A V R P \ I \ I \ I \ : T THE HATCHED AREA IN THE CWQZ REQUIRES NATIVE GRASSLAND SEEDING AND PLANTING PER CITY OF AUSTIN STANDARD SPECIFICATION 609S.6 INCLUDING TOPSOIL AND SEED BED PREPARATION, TEMPORARY IRRIGATION AND WEED MAINTENANCE. 025 NOTES LIMITS OF CONSTRUCTION: 0.146 AC 1. 2. 3. 5. THE ENVIRONMENTAL INSPECTOR HAS THE AUTHORITY TO ADD AND/OR MODIFY EROSION/SEDIMENTATION CONTROL ON SITE TO KEEP PROJECT IN-COMPLIANCE WITH THE CITY OF AUSTIN RULES AND REGULATIONS. THE CONTRACTOR SHALL PROVIDE DUST CONTROL MEASURES DURING ALL SITE CONSTRUCTION SUCH AS IRRIGATION TRUCKS AND MULCHING CONSISTENT WITH ECM 1.4.5(D) OR AS DIRECTED BY THE ENVIRONMENTAL INSPECTOR. 4. SILT FENCE TYPE AND INSTALLATION SHALL COMPLY WITH ECM 1.4.2(G). THE CONTRACTOR SHALL SUBMIT A DE-WATERING PLAN WHICH MAY INCLUDE A TEMPORARY DIVERSION CHANNEL, DIVERSION PIPE, PUMPS, COFFER DAM, OR OTHER APPROVED METHODS AND SHALL OBTAIN DE-WATERING PLAN APPROVAL PRIOR TO CONSTRUCTION. SANDBAGS, EARTHEN DIKES OR OTHER ERODIBLE MATERIALS ARE NOT ACCEPTABLE. THE CONTRACTOR SHALL MAINTAIN DE-WATERING SYSTEM AS NECESSARY TO ENSURE PROPER PERFORMANCE. IF THE DE-WATERING SYSTEM IS NOT PERFORMING, THE CONTRACTOR MUST FOLLOW THE ENVIRONMENTAL INSPECTOR'S DIRECTIONS TO ENSURE ADEQUATE SYSTEM PERFORMANCE. 6. ALL REVEGETATION SHALL CONFORM TO CITY OF AUSTIN SPECIFICATIONS. 7. CITY OF AUSTIN ENVIRONMENTAL CRITERIA MANUAL, SECTION 3.5.4 TREE AND NATURAL PRESERVATION: a. PRIOR TO EXCAVATION WITHIN TREE DRIPLINES OR THE REMOVAL OF TREES ADJACENT TO OTHER TREES THAT ARE TO REMAIN, MAKE A CLEAN CUT BETWEEN THE DISTURBED AND UNDISTURBED ROOT ZONES WITH A ROCK SAW OR SIMILAR EQUIPMENT TO MINIMIZE ROOT DAMAGE. b. IN CRITICAL ROOT ZONE AREAS THAT CANNOT BE PROTECTED DURING CONSTRUCTION WITH FENCING AND WHERE HEAVY VEHICULAR TRAFFIC IS ANTICIPATED, COVER THOSE AREAS WITH FOUR (4) INCHES OF ORGANIC MULCH OR GRAVEL TO MINIMIZE SOIL COMPACTION. c. PERFORM ALL GRADING WITHIN CRITICAL ROOT ZONE AREAS BY HAND OR WITH SMALL EQUIPMENT TO MINIMIZE ROOT DAMAGE. d. WATER ALL TREES MOST HEAVILY IMPACTED BY CONSTRUCTION ACTIVITIES DEEPLY ONCE A WEEK DURING PERIODS OF HOT, DRY WEATHER. SPRAY TREE CROWNS WITH WATER PERIODICALLY TO REDUCE DUST ACCUMULATION ON THE LEAVES. e. WHEN INSTALLING CONCRETE ADJACENT TO THE ROOT ZONE OF A TREE, USE A PLASTIC VAPOR BARRIER BEHIND THE CONCRETE TO PROHIBIT LEACHING OF LIME INTO THE SOIL. 8. IF NO CONSTRUCTION IS SCHEDULED IN A DISTURBED AREA FOR MORE THAN 14 DAYS, THE DISTURBED AREA MUST BE STABILIZED BY REVEGETATION, MULCH, TARP OR REVEGETATION MATTING. 9. ALL CURB INLETS SHALL HAVE TYPE II INLET PROTECTION WHICH SHALL REMAIN IN PLACE UNTIL THE COMPLETION OF ALL CONSTRUCTION AND REVEGETATION ACTIVITIES. 10. A PRECONSTRUCTION MEETING WITH THE ENVIROMENTAL INSPECTOR IS REQUIRED PRIOR TO ANY SITE DISTURBANCE. THIS DOCUMENT IS RELEASED FOR THE PURPOSE OF INTERIM REVIEW UNDER THE AUTHORITY OF MARK T. ZUPAN #128994 ON THE DATE SHOWN ON THE DATE STAMP. IT IS NOT TO BE USED FOR CONSTRUCTION, BIDDING, OR PERMIT PURPOSES. Know what's below. Call before you dig. THE LOCATIONS OF EXISTING UNDERGROUND UTILITIES ARE SHOWN IN AN APPROXIMATE WAY ONLY AND HAVE NOT BEEN INDEPENDENTLY VERIFIED BY THE OWNER OR ITS REPRESENTATIVE. THE CONTRACTOR SHALL DETERMINE THE EXACT LOCATION OF ALL EXISTING UTILITIES BEFORE COMMENCING WORK, AND AGREES TO BE FULLY RESPONSIBLE FOR ANY AND ALL DAMAGES WHICH MIGHT BE OCCASIONED BY THE CONTRACTOR'S FAILURE TO EXACTLY LOCATE AND PRESERVE ANY AND ALL UNDERGROUND UTILITIES. NOTICE: CONSTRUCTION SITE SAFETY IS THE SOLE RESPONSIBILITY OF THE CONTRACTOR; NEITHER THE OWNER NOR THE ENGINEER SHALL BE EXPECTED TO ASSUME ANY RESPONSIBILITY FOR SAFETY OF THE WORK, OF PERSONS ENGAGED IN THE WORK, OF ANY NEARBY STRUCTURES, OR OF ANY OTHER PERSONS. COPYRIGHT C 2019 ATWELL LLC NO REPRODUCTION SHALL BE MADE WITHOUT THE PRIOR WRITTEN CONTENT OF ATWELL LLC 0 10' 20' 40' SCALE: 1" = 20' 8' 0.6 2 2 ABANDONED ALLEY W W W W W W COA FULLY DEVELOPED FLOODPLAIN C . W . Q . Z . 11. “SPECIAL CONSTRUCTION TECHNIQUES ECM 3.5.4(D) PRIOR TO EXCAVATION WITHIN TREE DRIPLINES OR THE REMOVAL OF TREES ADJACENT TO OTHER TREES THAT ARE TO REMAIN, MAKE A CLEAN CUT BETWEEN THE DISTURBED AND UNDISTURBED ROOT ZONES WITH A ROCK SAW OR SIMILAR EQUIPMENT TO MINIMIZE ROOT DAMAGE. CRITICAL ROOT ZONE AREAS THAT CANNOT BE PROTECTED DURING CONSTRUCTION WITH FENCING AND WHERE HEAVY VEHICULAR TRAFFIC IS ANTICIPATED, COVER THOSE AREAS WITH A MINIMUM OF 12 INCHES OF ORGANIC MULCH TO MINIMIZE SOIL COMPACTION. IN AREAS WITH HIGH SOIL PLASTICITY GEOTEXTILE FABRIC, PER STANDARD SPECIFICATION 620S, SHOULD BE PLACED UNDER THE MULCH TO PREVENT EXCESSIVE MIXING OF THE SOIL AND MULCH. ADDITIONALLY, MATERIAL SUCH AS PLYWOOD AND METAL SHEETS, COULD BE REQUIRED BY THE CITY ARBORIST TO MINIMIZE ROOT IMPACTS FROM HEAVY EQUIPMENT. ONCE THE PROJECT IS COMPLETED, ALL MATERIALS SHOULD BE REMOVED, AND THE MULCH SHOULD BE REDUCED TO A DEPTH OF 3 INCHES. PERFORM ALL GRADING WITHIN CRITICAL ROOT ZONE AREAS BY HAND OR WITH SMALL EQUIPMENT TO MINIMIZE ROOT DAMAGE. WATER ALL TREES MOST HEAVILY IMPACTED BY CONSTRUCTION ACTIVITIES DEEPLY ONCE A WEEK DURING PERIODS OF HOT, DRY WEATHER. SPRAY TREE CROWNS WITH WATER PERIODICALLY TO REDUCE DUST ACCUMULATION ON THE LEAVES. WHEN INSTALLING CONCRETE ADJACENT TO THE ROOT ZONE OF A TREE, USE A PLASTIC VAPOR BARRIER BEHIND THE CONCRETE TO PROHIBIT LEACHING OF LIME INTO THE SOIL.” 12. REFER TO SHEETS 12-14 FOR RESTORATION PLAN. LEGEND FEMA 100 YEAR FLOOD PLAIN C O L TP 006 F S P T C O L LOC TP SF TP TP SF C O L MH 118979 W W F C S O L 25' - 0" SETBACK 6" CONC (90-0020) N 70°35'43" W 40.01' HATCHED AREA LOC IN CWQZ. C O F S L 3-FT WIDE COFFER DAM SEVERE SERVICE ROCK BERM ENCAPSULATED IN IMPERMEABLE GEOMEMBRANE. W W W W C O L F S K C A B T E C O L F S CONTRACTOR SHALL REMOVE ALL THE BULLROCK IN THE CREEK, ASSOCIATED WITH THE TEMPORARY BRIDGE AND ROCK BERM COFFER DAMS, AFTER THE PERMANENT BRIDGE IS CONSTRUCTED. BLOCK 3 NORTH EXTENSION TO BOULDIN ADDITION BOOK 2, PG. 135 P.R.T.C.TX. 1 0 0 ' E R O S I O N H A Z A R D B U F F E R LOT 5 LOT 4 TREE LEGEND October 15, 2020 CITY APPROVAL SITE PLAN RELEASE FILE NUMBER: _________________ EXPIRATION DATE: ___________ Sheet Of 13 5 CASE MANAGER: _________________ APPLICATION DATE: ___________ APPROVED ADMINISTRATIVELY ON: _____________________________ APPROVED BY PLANNING COMMISSION ON: _______________________ APPROVED BY CITY COUNCIL ON: _____________________________ Under Section 112 of Chapter 25-5 Of The Austin City Code ____________________________________________________________________ Director, Department of Planning and Development DATE OF RELEASE: __________________ Zoning: ______________ Rev 1 ____________________ Correction 1 _________________________ Rev 2 ____________________ Correction 2 _________________________ Rev 3 ____________________ Correction 3 _________________________ REVISIONS SCALE SCALE 0 DR. CJM CH. AA P.M. MZ BOOK -- JOB 19002268 SHEET NO. 5 __ OF 13 . I - G W D C S E E N N A E L I F D A C : COA CASE NO: SP-2020-0093DS 0 0 3 E T U S I , I Y A W H G H S A X E T F O L A T P A C I . S 5 1 8 3 4 0 7 8 7 X T , I N T S U A 9 0 5 0 - 4 0 9 - 2 1 5 : F / 5 0 5 0 - 4 0 9 - 2 1 5 : O 2 4 2 2 1 . o N E P B T 4 0 7 8 7 X T , I N T S U A I I N O T A T N E M D E S D N A N O S O R E I L O R T N O C T E E R T S E N N A I . W 2 1 1 1 X T A N A B R U T N E L C I DATE THE ESC SHEET AND RESTORATION PLAN MUST BE USED IN CONJUNCTION FOR THE INSTALLATION OF THE TEMPORARY ROCK BERMS AND THE CONSTRUCTION OF THE PERMANENT BRIDGE. WL WL W W W WL W 48" CSC (W-86-0016) WL WL WL 10/15/202020 of 45B-521 of 45B-522 of 45B-523 of 45B-524 of 45B-525 of 45B-5TRACTS I THRU IV NOTES INSTRUMENT NO. 2000024480 LIMITS OF CONSTRUCTION: 0.146 AC 108 1. THE ENVIRONMENTAL INSPECTOR HAS THE AUTHORITY TO ADD AND/OR MODIFY EROSION/SEDIMENTATION CONTROL ON SITE TO KEEP PROJECT IN-COMPLIANCE WITH THE CITY OF AUSTIN RULES AND REGULATIONS. O.P.R.T.C.TX. THE CONTRACTOR SHALL PROVIDE DUST CONTROL MEASURES DURING ALL SITE CONSTRUCTION SUCH AS IRRIGATION TRUCKS AND MULCHING CONSISTENT WITH ECM 1.4.5(D) OR AS DIRECTED BY THE ENVIRONMENTAL INSPECTOR. 4. SILT FENCE TYPE AND INSTALLATION SHALL COMPLY WITH ECM 1.4.2(G). 2. 3. 5. P T P T W W W A STE W ATE R V O L. 11900 P G 840 E A S E M E N T R.P.R.T.C.TX. W W 009 0 10' 20' 40' SCALE: 1" = 20' 008 THE HATCHED AREA IN THE CWQZ REQUIRES NATIVE GRASSLAND SEEDING AND PLANTING PER CITY OF AUSTIN STANDARD SPECIFICATION 609S.6 INCLUDING TOPSOIL T P AND SEED BED PREPARATION, TEMPORARY IRRIGATION AND WEED MAINTENANCE. T P LOC SF LOC P T C O L TP 006 007 T P F S P T C O L LOC T P SF TP TP SF C O L MH 118979 W W F C S O L RESTORATION OF THE NORTHERN BANK SHOULD BE TO THE STANDARDS SHOWN IN PERMIT #GP-2014-0593.WPD, USING D50=24" BULLROCK 25' - 0" SETBACK WW 6" CONC (90-0020) N 70°35'43" W 40.01' C O F S L 3-FT WIDE COFFER DAM SEVERE SERVICE ROCK BERM ENCAPSULATED IN IMPERMEABLE GEOMEMBRANE. WW C O L F S K C A B T E C O L F S CONTRACTOR SHALL REMOVE ALL THE BULLROCK IN THE CREEK, ASSOCIATED WITH THE TEMPORARY BRIDGE AND ROCK BERM COFFER DAMS, AFTER THE PERMANENT BRIDGE IS CONSTRUCTED. THE CONTRACTOR SHALL SUBMIT A DE-WATERING PLAN WHICH MAY INCLUDE A TEMPORARY DIVERSION CHANNEL, DIVERSION PIPE, PUMPS, COFFER DAM, OR OTHER APPROVED METHODS AND SHALL OBTAIN DE-WATERING PLAN APPROVAL PRIOR TO CONSTRUCTION. SANDBAGS, EARTHEN DIKES OR OTHER ERODIBLE MATERIALS ARE NOT ACCEPTABLE. THE CONTRACTOR SHALL MAINTAIN DE-WATERING SYSTEM AS NECESSARY TO ENSURE PROPER PERFORMANCE. IF THE DE-WATERING SYSTEM IS NOT PERFORMING, THE CONTRACTOR MUST FOLLOW THE ENVIRONMENTAL INSPECTOR'S DIRECTIONS TO ENSURE ADEQUATE SYSTEM PERFORMANCE. 6. ALL REVEGETATION SHALL CONFORM TO CITY OF AUSTIN SPECIFICATIONS. 7. CITY OF AUSTIN ENVIRONMENTAL CRITERIA MANUAL, SECTION 3.5.4 TREE AND NATURAL PRESERVATION: a. PRIOR TO EXCAVATION WITHIN TREE DRIPLINES OR THE REMOVAL OF TREES ADJACENT TO OTHER TREES THAT ARE TO REMAIN, MAKE A CLEAN CUT BETWEEN THE DISTURBED AND UNDISTURBED ROOT ZONES WITH A ROCK SAW OR SIMILAR EQUIPMENT TO MINIMIZE ROOT DAMAGE. b. IN CRITICAL ROOT ZONE AREAS THAT CANNOT BE PROTECTED DURING CONSTRUCTION WITH FENCING AND WHERE HEAVY VEHICULAR TRAFFIC IS ANTICIPATED, COVER THOSE AREAS WITH FOUR (4) INCHES OF ORGANIC MULCH OR GRAVEL TO MINIMIZE SOIL COMPACTION. c. PERFORM ALL GRADING WITHIN CRITICAL ROOT ZONE AREAS BY HAND OR WITH SMALL EQUIPMENT TO MINIMIZE ROOT DAMAGE. d. WATER ALL TREES MOST HEAVILY IMPACTED BY CONSTRUCTION ACTIVITIES DEEPLY ONCE A WEEK DURING PERIODS OF HOT, DRY WEATHER. SPRAY TREE CROWNS WITH WATER PERIODICALLY TO REDUCE DUST ACCUMULATION ON THE LEAVES. e. WHEN INSTALLING CONCRETE ADJACENT TO THE ROOT ZONE OF A TREE, USE A PLASTIC VAPOR BARRIER BEHIND THE CONCRETE TO PROHIBIT LEACHING OF LIME INTO THE SOIL. 8. IF NO CONSTRUCTION IS SCHEDULED IN A DISTURBED AREA FOR MORE THAN 14 DAYS, THE DISTURBED AREA MUST BE STABILIZED BY REVEGETATION, MULCH, TARP OR REVEGETATION MATTING. 9. ALL CURB INLETS SHALL HAVE TYPE II INLET PROTECTION WHICH SHALL REMAIN IN PLACE UNTIL THE COMPLETION OF ALL CONSTRUCTION AND REVEGETATION ACTIVITIES. 10. A PRECONSTRUCTION MEETING WITH THE ENVIROMENTAL INSPECTOR IS REQUIRED PRIOR TO ANY SITE DISTURBANCE. 11. “SPECIAL CONSTRUCTION TECHNIQUES ECM 3.5.4(D) PRIOR TO EXCAVATION WITHIN TREE DRIPLINES OR THE REMOVAL OF TREES ADJACENT TO OTHER TREES THAT ARE TO REMAIN, MAKE A CLEAN CUT BETWEEN THE DISTURBED AND UNDISTURBED ROOT ZONES WITH A ROCK SAW OR SIMILAR EQUIPMENT TO MINIMIZE ROOT DAMAGE. CRITICAL ROOT ZONE AREAS THAT CANNOT BE PROTECTED DURING CONSTRUCTION WITH FENCING AND WHERE HEAVY VEHICULAR TRAFFIC IS ANTICIPATED, COVER THOSE AREAS WITH A MINIMUM OF 12 INCHES OF ORGANIC MULCH TO MINIMIZE SOIL COMPACTION. IN AREAS WITH HIGH SOIL PLASTICITY GEOTEXTILE FABRIC, PER STANDARD SPECIFICATION 620S, SHOULD BE PLACED UNDER THE MULCH TO PREVENT EXCESSIVE MIXING OF THE SOIL AND MULCH. ADDITIONALLY, MATERIAL SUCH AS PLYWOOD AND METAL SHEETS, COULD BE REQUIRED BY THE CITY ARBORIST TO MINIMIZE ROOT IMPACTS FROM HEAVY EQUIPMENT. ONCE THE PROJECT IS COMPLETED, ALL MATERIALS SHOULD BE REMOVED, AND THE MULCH SHOULD BE REDUCED TO A DEPTH OF 3 INCHES. PERFORM ALL GRADING WITHIN CRITICAL ROOT ZONE AREAS BY HAND OR WITH SMALL EQUIPMENT TO MINIMIZE ROOT DAMAGE. ABANDONED ALLEY W W WATER ALL TREES MOST HEAVILY IMPACTED BY CONSTRUCTION ACTIVITIES DEEPLY ONCE A WEEK DURING PERIODS OF HOT, DRY WEATHER. SPRAY TREE CROWNS WITH WATER PERIODICALLY TO REDUCE DUST ACCUMULATION ON THE LEAVES. WHEN INSTALLING CONCRETE ADJACENT TO THE ROOT ZONE OF A TREE, USE A PLASTIC VAPOR BARRIER BEHIND THE CONCRETE TO PROHIBIT LEACHING OF LIME INTO THE SOIL.” LEGEND COA FULLY DEVELOPED FLOODPLAIN FEMA 100 YEAR FLOOD PLAIN THE ESC SHEET AND RESTORATION PLAN MUST BE USED IN CONJUNCTION FOR THE INSTALLATION OF THE TEMPORARY ROCK BERMS AND THE CONSTRUCTION OF THE PERMANENT BRIDGE. TP SF W W R E F F U D B R A Z A N H S I O O R 1 0 0' E · GRASSES SHALL CONSTITUTE 67 PERCENT OF THE SEED MIX, WITH FORBS COMPRISING 33 PERCENT. NO SPECIES SHALL CONSTITUTE MORE THAN 20% OF A SEED MIX. PLANTS MUST BE A MINIMUM SIZE OF 1-GALLON (SEE TABLE 8, EQUIVALENCY CHART) AND MINIMUM OF 1 PLANT PER 100 SQUARE FEET. THE MUST BE SPECIES FROM THIS LINK <HTTP://WWW.AUSTINTEXAS.GOV/DEPARTMENT/G ROW-GREEN/PLANT-GUIDE> OUT OF THE REQUIRED AMOUNT THE DIVERSITY WILL NEED TO BE TWO NATIVE SPECIES OF SMALL OR LARGE TREES AND TWO NATIVE SPECIES OF SHRUBS WITH VERY LOW OR LOW WATER NEEDS AND SUN OR SUN/PART SHADE LIGHT NEEDS AS LISTED IN THE CURRENT GROW GREEN NATIVE AND ADAPTED LANDSCAPE PLANTS GUIDANCE DOCUMENT WITH CAP STAMPED "SEELIG" W W TP W W TP T P WITH CAP STAMPED "SEELIG" T P W W T P T P 011 010 W W BEFORE RELEASE OF FISCAL, THE ENVIRONMENTAL INSPECTOR IS TO CONTACT CHARLIE KEOUGH WITH WATERSHED PROTECTION AT 512-974-3397, CHARLES.KAOUGH@AUSTINTEXAS.GOV AND HANK MARLEY AT HANK.MAREY@AUSTINTEXAS.GOV FROM DEVELOPMENT SERVICES TO ENSURE THAT THE RESTORATION OF CITY EROSION CONTROL IS COMPLETE. TP P T 19.86' W W P T SF LOC 005 T P TP N 70°35'43" W 42.17' L O C F S W W W W 25' - 0" SETBACK SF LOC W W L O C F S 3-FT WIDE COFFER DAM SEVERE SERVICE ROCK BERM ENCAPSULATED IN IMPERMEABLE GEOMEMBRANE. W W W W L O C F S MH 118977 ON-SITE SEDIMENT LADEN WATER SHALL BE PUMPED AND TREATED USING DEWATERING FILTER BAG W W L O C F S K C A B T E 5' - 0" S 2' 1.3 9 ~ L O C F S 8" E 3'0 8°0 N 2 L O C F S 10-FT WIDE BULL ROCK BERM USED FOR ACCESS. ℄ 0) 2 0 0-0 9 9 W W G (S-1 4" F 2 W W ODPLAIN C.W.Q.Z. W W COA FULLY DEVELOPED FLO FEMA 100 YEAR FLO L W W W W W OD PLAIN W W LOT 8 W L W W W L W L TP TP L O C F S F S W W NAIL SET AT BASE OF TREE T P 001 T P W L W W W L F H 1 6 4 8 3 1 W L WL W L T P L O C 6 " W L ( N O T S H O W N O N S V C I N T 1 8 5 8 3 ) A W U W W W L WL L O C F S P T L O C P T S E 25' - 0" T B A C K S F SF LOT 7 L O C LOC STABILIZED CONSTRUCTION ENTRANCE W L C.W.Q.Z. W L M H 2 7 3 8 2 W W W W W L AWU WTR INT: 18583 AWU WW PROF: A180 W L W W 8" SDR-26 PVC (S-2007-0004) W W L W WL W. ANNIE STREET (R.O.W. VARIES) M H 1 1 8 9 8 7 W W W W W W W W W W W W W W SF T P 003 F S T P T P P S F T 004 5' - 0" S 2' 4.2 C O 9 L 8" W ~ 3'0 8°0 002 S 2 C O L P T P T C O L TP T P F S C O L T P F S C O L F S C O L LOT 6 SQUARE HEAD BOLT FOUND NORTH EXTENSION TO BOULDIN ADDITION TREE LEGEND BOOK 2, PG. 135 P.R.T.C.TX. 1 0 0 ' E R O S I O N H A Z A R D B U F F E R CITY APPROVAL LOT 5 SITE PLAN RELEASE FILE NUMBER: _________________ EXPIRATION DATE: ___________ Sheet Of 13 12 CASE MANAGER: _________________ APPLICATION DATE: ___________ APPROVED ADMINISTRATIVELY ON: _____________________________ APPROVED BY PLANNING COMMISSION ON: _______________________ APPROVED BY CITY COUNCIL ON: _____________________________ Under Section 112 of Chapter 25-5 Of The Austin City Code ____________________________________________________________________ Director, Department of Planning and Development DATE OF RELEASE: __________________ Zoning: ______________ Rev 1 ____________________ Correction 1 _________________________ Rev 2 ____________________ Correction 2 _________________________ Rev 3 ____________________ Correction 3 _________________________ REVISIONS SCALE SCALE 0 DR. CJM CH. AA P.M. MZ BOOK -- JOB 19002268 SHEET NO. 12 __ OF 13 . I - G W D T S E R E N N A E L I F D A C : COA CASE NO: SP-2020-0093DS THIS DOCUMENT IS RELEASED FOR THE PURPOSE OF INTERIM REVIEW UNDER THE AUTHORITY OF MARK T. ZUPAN #128994 ON THE DATE SHOWN ON THE DATE STAMP. IT IS NOT TO BE USED FOR CONSTRUCTION, BIDDING, OR PERMIT PURPOSES. Know what's below. Call before you dig. THE LOCATIONS OF EXISTING UNDERGROUND UTILITIES ARE SHOWN IN AN APPROXIMATE WAY ONLY AND HAVE NOT BEEN INDEPENDENTLY VERIFIED BY THE OWNER OR ITS REPRESENTATIVE. THE CONTRACTOR SHALL DETERMINE THE EXACT LOCATION OF ALL EXISTING UTILITIES BEFORE COMMENCING WORK, AND AGREES TO BE FULLY RESPONSIBLE FOR ANY AND ALL DAMAGES WHICH MIGHT BE OCCASIONED BY THE CONTRACTOR'S FAILURE TO EXACTLY LOCATE AND PRESERVE ANY AND ALL UNDERGROUND UTILITIES. NOTICE: CONSTRUCTION SITE SAFETY IS THE SOLE RESPONSIBILITY OF THE CONTRACTOR; NEITHER THE OWNER NOR THE ENGINEER SHALL BE EXPECTED TO ASSUME ANY RESPONSIBILITY FOR SAFETY OF THE WORK, OF PERSONS ENGAGED IN THE WORK, OF ANY NEARBY STRUCTURES, OR OF ANY OTHER PERSONS. COPYRIGHT C 2019 ATWELL LLC NO REPRODUCTION SHALL BE MADE WITHOUT THE PRIOR WRITTEN CONTENT OF ATWELL LLC 0 0 3 E T U S I , I Y A W H G H S A X E T F O L A T P A C I . S 5 1 8 3 4 0 7 8 7 X T , I N T S U A 9 0 5 0 - 4 0 9 - 2 1 5 : F / 5 0 5 0 - 4 0 9 - 2 1 5 : O 2 4 2 2 1 . o N E P B T 4 0 7 8 7 X T , I N T S U A I N A L P N O T A R O T S E R & S N E T E E R T S E N N A I . W 2 1 1 1 X T A N A B R U T N E L C I DATE October 15, 2020 I Z E N T R A M S O L R A C M A 9 2 : 6 0 2 0 2 / 5 1 / . \ I I - 0 1 G W D T S E R E N N A N O T C U R T S N O C T H S N G S E D E N N A 2 1 1 1 X T A N A B R U E T A V R P \ I \ I \ I \ \ : T 10/15/202026 of 45B-5N 69°09'00" W 42.41' L C W W L C L C L C L C W W K C A B T E 5' - 0" S W W W W L C L C L C L C L C L C 3' 1.5 0" E 9 0'0 0°0 N 3 L C L C L C L C L C L C L C L C L C L C L C L C W L L C S E 25' - 0" T B A C K LOT 7 W W W W ℄ W W MH 118977 W W W W W W W W 0) 2 0 0-0 9 9 · GRASSES SHALL CONSTITUTE 67 PERCENT OF THE SEED MIX, WITH FORBS COMPRISING 33 PERCENT. NO SPECIES SHALL CONSTITUTE MORE THAN 20% OF A SEED MIX. PLANTS MUST BE A MINIMUM SIZE OF 1-GALLON (SEE TABLE 8, EQUIVALENCY CHART) AND MINIMUM OF 1 PLANT PER 100 SQUARE FEET. THE MUST BE SPECIES FROM THIS LINK <HTTP://WWW.AUSTINTEXAS.GOV/DEPARTMENT/G ROW-GREEN/PLANT-GUIDE> OUT OF THE REQUIRED AMOUNT THE DIVERSITY WILL NEED TO BE TWO NATIVE SPECIES OF SMALL OR LARGE TREES AND TWO NATIVE SPECIES OF SHRUBS WITH VERY LOW OR LOW WATER NEEDS AND SUN OR SUN/PART SHADE LIGHT NEEDS AS LISTED IN THE CURRENT GROW GREEN NATIVE AND ADAPTED LANDSCAPE PLANTS GUIDANCE DOCUMENT 2 G (S-1 4" F C L C L C L C L C L C L C L C L C L C L C L C L LOT 6 SQUARE HEAD BOLT FOUND L C L C L C C L L C STABILIZED W L W L W L 6 " LC W L ( N O T S H O W N O N S V C I N T 1 8 5 8 3 ) A W U LC LC L C I . \ I - Z E N T R A M S O L R A C M P 1 3 : 3 0 2 0 2 / 4 1 / 0 1 G W D T N L P E N N A N O T C U R T S N O C T H S N G S E D E N N A 2 1 1 1 X T A N A B R U E T A V R P I \ I \ I \ I \ \ : T 0 5' 10' 2.5' SCALE: 1" = 5' NOTES WW6" CONC (90-0020) N 68°15'00" W 38.88' GRASS MIX 67% FROM TABLE 4: BUFFALO GRASS 20% FOR SHADE AREA (FROM TABLE 5): CANADA WILDRYE 20% SIDEOATS GRAMA 20% INLAND SEAOATS 7% WESTERN WHEATGRASS TO REPLACE INLAND SEAOATS IF PLANTED BETWEEN SEPT 15TH AND MARCH 1ST. FORBS 33% FROM TABLE 5: PURPLE CONEFLOWER 6% MILKWEED 11% WINECUP FLOWER 11% BLACK EYED SUSAN 5% Know what's below. Call before you dig. THE LOCATIONS OF EXISTING UNDERGROUND UTILITIES ARE SHOWN IN AN APPROXIMATE WAY ONLY AND HAVE NOT BEEN INDEPENDENTLY VERIFIED BY THE OWNER OR ITS REPRESENTATIVE. THE CONTRACTOR SHALL DETERMINE THE EXACT LOCATION OF ALL EXISTING UTILITIES BEFORE COMMENCING WORK, AND AGREES TO BE FULLY RESPONSIBLE FOR ANY AND ALL DAMAGES WHICH MIGHT BE OCCASIONED BY THE CONTRACTOR'S FAILURE TO EXACTLY LOCATE AND PRESERVE ANY AND ALL UNDERGROUND UTILITIES. NOTICE: CONSTRUCTION SITE SAFETY IS THE SOLE RESPONSIBILITY OF THE CONTRACTOR; NEITHER THE OWNER NOR THE ENGINEER SHALL BE EXPECTED TO ASSUME ANY RESPONSIBILITY FOR SAFETY OF THE WORK, OF PERSONS ENGAGED IN THE WORK, OF ANY NEARBY STRUCTURES, OR OF ANY OTHER PERSONS. COPYRIGHT C 2019 ATWELL LLC NO REPRODUCTION SHALL BE MADE WITHOUT THE PRIOR WRITTEN CONTENT OF ATWELL LLC RESTORATION OF THE NORTHERN BANK SHOULD BE TO THE STANDARDS SHOWN IN PERMIT #GP-2014-0593.WPD, USING D50=24" BULLROCK C L MH 118979 W W W W W W C L C L C L C L C L C L C L C L C L K C A B T E 6' 4.6 0" W 9 0'0 0°0 S 3 C L C L 5' - 0" S C L C L C L C L THE HATCHED AREA IN THE CWQZ REQUIRES NATIVE GRASSLAND SEEDING AND PLANTING PER CITY OF AUSTIN STANDARD SPECIFICATION 609S.6 INCLUDING TOPSOIL AND SEED BED PREPARATION, TEMPORARY IRRIGATION AND WEED MAINTENANCE. THIS DOCUMENT IS RELEASED FOR THE PURPOSE OF INTERIM REVIEW UNDER THE AUTHORITY OF MARK T. ZUPAN #128994 ON THE DATE SHOWN ON THE DATE STAMP. IT IS NOT TO BE USED FOR CONSTRUCTION, BIDDING, OR PERMIT PURPOSES. 0 0 3 E T U S I , I Y A W H G H S A X E T F O L A T P A C I . S 5 1 8 3 4 0 7 8 7 X T , I N T S U A 9 0 5 0 - 4 0 9 - 2 1 5 : F / 5 0 5 0 - 4 0 9 - 2 1 5 : O 2 4 2 2 1 . o N E P B T 4 0 7 8 7 X T , I N T S U A N A L P G N T N A L P I T E E R T S E N N A I . W 2 1 1 1 X T A N A B R U LEGEND TREE LEGEND CITY APPROVAL SITE PLAN RELEASE FILE NUMBER: _________________ EXPIRATION DATE: ___________ Sheet Of 13 11 CASE MANAGER: _________________ APPLICATION DATE: ___________ APPROVED ADMINISTRATIVELY ON: _____________________________ APPROVED BY PLANNING COMMISSION ON: _______________________ APPROVED BY CITY COUNCIL ON: _____________________________ Under Section 112 of Chapter 25-5 Of The Austin City Code ____________________________________________________________________ Director, Department of Planning and Development DATE OF RELEASE: __________________ Zoning: ______________ Rev 1 ____________________ Correction 1 _________________________ Rev 2 ____________________ Correction 2 _________________________ Rev 3 ____________________ Correction 3 _________________________ REVISIONS SCALE SCALE 0 DR. CJM CH. AA P.M. MZ BOOK -- JOB 19002268 SHEET NO. 11 __ OF 13 . I - G W D T N L P E N N A E L I F D A C : COA CASE NO: SP-2020-0093DS NORTH EXTENSION TO BOULDIN ADDITION T N E L C DATE I October 14, 2020 27 of 45B-528 of 45B-529 of 45B-530 of 45B-531 of 45B-532 of 45B-533 of 45B-534 of 45B-535 of 45B-536 of 45B-537 of 45B-538 of 45B-539 of 45B-540 of 45B-541 of 45B-542 of 45B-543 of 45B-544 of 45B-545 of 45B-5