20210120-003b: 3336 Mount Bonnell Rd SP-2020-0274D variance packet — original pdf

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ITEM FOR ENVIRONMENTAL COMMISSION AGENDA COMMISSION MEETING DATE: Jan. 20th, 2020 NAME & NUMBER OF PROJECT: 3336 Mount Bonnell Road SP-2020-0274D NAME OF APPLICANT OR ORGANIZATION: Caitlin Kuglen Kimley-Horn LOCATION: 3336 Mount Bonnell Road Austin, TX 78731 COUNCIL DISTRICT: District # 10 ENVIRONMENTAL REVIEW STAFF: Radmon Rice, Environmental Scientist Watershed Protection Department, 512.974.3429, radmon.rice@austintexas.gov WATERSHED: REQUEST: STAFF RECOMMENDATION: STAFF CONDITION: Lake Austin and Huck’s Slough watersheds, Water Supply Suburban, Drinking Water Protection Zone Variance request is as follows: Request to vary from LDC 25-8-281(C)(2)(b) to allow the construction within 150-foot of a spring Critical Environmental Feature (CEF). Staff recommends this variance with conditions, having determined the findings of fact to have been met. Remove existing boat dock and access path as specified on plans; restore disturbed areas per City Standard Specification 609S. Staff Findings of Fact  Watershed Protection Department Staff Recommendations Concerning Required Findings Project Name & Case Number: 3336 Mount Bonnell Road Ordinance Standard: Watershed Protection Ordinance Variance Request: LDC 25-8-281(C)(2)(b) - To allow construction within 150 feet of a Spring Critical Environmental Features (CEF) . 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. A variance from 25-8-281(C)(2)(b) allowing for construction of a boat dock and shoreline access has been granted for 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; Yes. No disturbance of the spring CEFs is proposed. The springs were observed during a drawdown of Lake Austin by Watershed Protection Department staff and currently have no expression above the surface of the water. The new location of the dock is preferential as it has removed the dock from the area between the two springs which was described by staff in their notes as a spring horizon, which is multiple outlets of spring flow along an area. b) Is the minimum deviation from the code requirement necessary to allow a reasonable use of the property; Yes. The variance is the minimum deviation from the code requirement to allow for a reasonable use of the property. The code requires a 150-foot critical environmental feature buffer. This buffer is not being reduced. The scope of the variance is limited to allowing construction activities to occur within a critical environmental feature buffer only for the proposed boat dock and access. c) Does not create a significant probability of harmful environmental consequences. Yes. The variance does not create significant harmful environmental consequences. Overland flow from the Limit of Construction will be treated by a sequence of erosion controls. Post construction, all disturbed areas will be revegetated per the City Standard Specification 609S. 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 variance will result in water quality that is at least equal to the water quality achievable without the variance. Staff Recommendation: Staff recommends the variance as the Findings of Fact have been met, with the staff recommended condition that all construction be completed by barge. 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: The criteria for granting a variance in Subsection (A) are met; Yes / No N/A Yes / No N/A The requirement for which a variance is requested prevents a reasonable, economic use of the entire property; 3. The variance is the minimum deviation from the code requirement necessary to allow a reasonable, economic use of the entire property. Yes / No N/A Staff Recommendation: N/A. 1. 2. Hydrogeologic Reviewer (WPD) ___________________________ Radmon Rice Date: 1/13/2021 Environmental Officer (WPD) _____________________________ Chris Herrington Date: 1/13/2021  Applicant Form and Findings of Fact October 26, 2020 ENVIRONMENTAL COMMISSION VARIANCE APPLICATION FORM PROJECT DESCRIPTION Applicant Contact Information Meg Clark 3336 Mt. Bonnell Road Austin, TX 78703 c/o Chrissy Short 512-421-0800 megelmoreclark@gmail.com Name of Applicant Street Address City State ZIP Code Work Phone E-Mail Address Case Name Case Number Variance Case Information 3336 Mt. Bonnell Road SP-2020-0274D 3336 Mt. Bonnell Road Pamela Abee-Taulli Address or Location Environmental Reviewer Name Environmental Resource Management Reviewer Name Applicable Ordinance LDC 25-8-281(C)(2)(b) Watershed Name Lake Austin Watershed Classification ☐Urban ☐ Suburban X Water Supply Suburban ☐Water Supply Rural ☐ Barton Springs Zone City of Austin | Environmental Commission Variance Application Guide 1 October 26, 2020 Edwards Aquifer Recharge Zone X Barton Springs Segment ☐ Not in Edwards Aquifer Zones ☐ Northern Edwards Segment Edwards Aquifer Contributing Zone Distance to Nearest Classified Waterway Water and Waste Water service to be provided by NA ☐ Yes X No The boat dock is in Lake Austin. Request The variance request is as follows (Cite code references: To allow construction in a rimrock CEF buffer. Impervious cover square footage: acreage: percentage: Provide general description of the property (slope range, elevation range, summary of vegetation / trees, summary of the geology, CWQZ, WQTZ, CEFs, floodplain, heritage trees, any other notable or outstanding characteristics of the property) Existing ________ ________ ________ Proposed _________ _________ _________ 3336 Mt. Bonnell Road is a lakefront, 3.1 acre, single-family homesite bounded by Lake Austin on the west, Mt. Bonnell Road on the east, Huck’s Slough on the north, and Westwood Country Club on the south. The site contains a home, dock, dock access, a rimrock, and three springs. It was originally developed in the early 20th century. Mormon Taylor Springs 1 and 2 are on the western boundary of the property on the Lake Austin shoreline while the rimrock and Huck Slough Spring are on the northern boundary of the property on the ridge above Huck Slough. Two Land Use Commission variances were granted in July of 2015 to allow a CEF on a residential lot and to reduce the rimrock CEF setbacks for the rimrock and Huck Slough spring. Without the variances, the lot wouldn’t have been buildable. It was platted shortly after the variances were granted. The entire shoreline is within the setbacks of Mormon Taylor Springs 1 and 2, and the existing dock/dock access are between the two springs. The proposed project entails constructing a new dock and dock access moved north of Mormon Taylor Spring 1 and away from Mormon Taylor Spring 2. The existing dock will be removed and the dock access restored. Attachment 1 contains an aerial photo of the site. The site is heavily vegetated with a slope of about 48% in the Critical Water Quality Zone (CWQZ) bordering the dock location. The vegetation in the CWQZ is dominated by native trees and shrubs. Attachment 2 contains the Proposed Conditions Site Plan and Erosion Controls Sheet for the project. Attachment 3 contains the Basis of Determination for the Findings of Fact, and Attachment 4 contains the Environmental Resource Inventory. City of Austin | Environmental Commission Variance Application Guide 2 October 26, 2020 FINDINGS OF FACT Project: Ordinance: Clearly indicate in what way the proposed project does not comply with current Code (include maps and exhibits) This project proposes to demolish an existing dock and its access and construct a new dock and access route in a less invasive location to the two springs on the lake Austin shoreline. The demolition of the dock and access as well as the construction of the new dock and access are within 150 ft. of two of the site springs. Please see Attachment 1 for the Proposed Conditions Site Plan and Erosion Controls Sheet. As required in LDC Section 25-8-41, in order to grant a variance the Land Use Commission must make the following findings of fact: 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 / No Please see Attachment 3, Basis of Determination. 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 / No Please see Attachment 3, Basis of Determination. b) Is the minimum deviation from the code requirement necessary to allow a reasonable use of the property; Yes / No Please see Attachment 3, Basis of Determination. c) Does not create a significant probability of harmful environmental consequences. Yes / No Please see Attachment 3, Basis of Determination. City of Austin | Environmental Commission Variance Application Guide 3 October 26, 2020 3. Development with the variance will result in water quality that is at least equal to the water quality achievable without the variance. Yes / No Please see Attachment 3, Basis of Determination. B. Additional Land Use Commission variance determinations for a requirement of Section 25-8-422 (Water Quality Transition Zone), Section 25-8-452 (Water Quality Transition Zone), Article 7, Division 1 (Critical Water Quality Zone Restrictions), or Section 25-8-368 (Restrictions on Development Impacting Lake Austin, Lady Bird Lake, and Lake Walter E. Long): 1. The criteria for granting a variance in Subsection (A) are met; Not Applicable 2. 3. Yes / No [provide summary of justification for determination] The requirement for which a variance is requested prevents a reasonable, economic use of the entire property; Yes / No [provide summary of justification for determination] The variance is the minimum deviation from the code requirement necessary to allow a reasonable, economic use of the entire property. Yes / No [provide summary of justification for determination] **Variance approval requires all above affirmative findings. City of Austin | Environmental Commission Variance Application Guide 4 October 26, 2020 A Exhibits for Commission Variance o Aerial photos of the site o Site photos o Aerial photos of the vicinity o Context Map—A map illustrating the subject property in relation to developments in the vicinity to include nearby major streets and waterways o Topographic Map - A topographic map is recommended if a significant grade change on the subject site exists or if there is a significant difference in grade in relation to adjacent properties. o For cut/fill variances, a plan sheet showing areas and depth of cut/fill with topographic elevations. o Site plan showing existing conditions if development exists currently on the property o Proposed Site Plan- full size electronic or at least legible 11x17 showing proposed development, include tree survey if required as part of site or subdivision plan o Environmental Map – A map that shows pertinent features including Floodplain, CWQZ, WQTZ, CEFs, Setbacks, Recharge Zone, etc. o An Environmental Resource Inventory pursuant to ECM 1.3.0 (if required by 25-8-121) o Applicant’s variance request letter City of Austin | Environmental Commission Variance Application Guide 5 October 26, 2020 ATTACHMENT 1 AERIAL SITE PHOTO City of Austin | Environmental Commission Variance Application Guide 6 October 26, 2020 ATTACHMENT 2 PROPOSED CONDITIONS SITE PLAN SHEET AND EROSION CONTROLS City of Austin | Environmental Commission Variance Application Guide 7 3336 MT. BONNELL ROAD 3 5 2 1 500 5 6 3 1 7 3 5 8 0 4 5 8 BOAT DOCK DECK EXISTING PROFILE DREDGE XSEC 1 0 0 10 10 20 20 30 30 40 40 50 50 EXISTING PROFILE BOAT DOCK DECK DREDGE XSEC 2 NOSE OF SLIP 524 EXISTING PROFILE 522 520 518 516 0 NONUNIFORM, IRREGULARLY SHAPED STEPPING STONES 20 6" MIN BEDDING MATERIAL 10 2 0 0 10 10 20 20 DREDGE APPROX. 10 CY 40 40 30 30 NOSE OF SLIP 50 50 BOAT DOCK ACCESS TYPICAL SECTION TREE # TREE CRITICAL ROOT ZONE AND 1 2 CRZ LEGEND EXISTING SHORELINE EXISTING RIMROCK CEF EXISTING RIMROCK CEF SETBACK CWQZ SETBACK FEMA 100-YR FLOODPLAIN/BFE XX FSS LOC XX FSS LOC TREE PROTECTION FLOATING SILT SCREEN LIMIT OF CONSTRUCTION LOC/MS LOC/MS LIMIT OF CONSTRUCTION/MULCH SOCK PROPOSED DOCK EXISTING DOCK/ACCESS TO BE DEMOLISHED DREDGE APPROX. 13 CY WSEL = 492.8' WSEL = 492.8' 500 500 498 498 496 496 494 494 492 492 490 488 500 500 498 498 496 496 494 494 492 492 490 488 8 6 4 8 7 6 4 8 9 6 4 8 DREDGE XSEC LOCATIONS 0 9 4 1 9 8 4 X X 2 7 3 8 X X 2 6 4 8 3 6 4 8 4 7 3 8 X 3 7 3 8 X X X X 1 8 3 8 HOUGH SLOUGH SPRING 0 8 3 8 6 0 8 7 5 7 3 8 X X X X X X X 3 7 3 8 9 7 3 8 X X X X X 2 8 3 8 X 3 8 3 8 X X X 5 X 8 3 8 X X 6 8 3 8 X X 7 8 3 8 RIMROCK X X X X X X X X 7 7 3 8 6 7 3 8 X X X X X X 8 0 8 7 3 1 5 8 0 9 3 8 9 1 5 8 9 8 3 8 8 8 3 8 X X RIMROCK 50FT CEF SETBACK SEE NOTE 24 ON THE PLAT ON SHEET 7 CITING PLANNING COMMISSION VARIANCES TO LDC 25-8-281(C)(1)(A) DATED 7/7/15 X X 3 1 2 S 7 C/M O L S C/M LO S C/M LO UTE O S C/M LO S C/M LO A H UL R S C/M LO C/MS LO 9 2 5 8 X 8 2 5 8 X X X S C/M LO LO C/M S 7 2 5 8 C O L X X C O L LOC XX L O C 0 3 5 8 X X L O C LOC/MS 525 L O X C X S M / C O L S M C/ O S C/M O L / S M C O L S M / C O L 515 1 2 5 8 5 2 5 8 S C/M LO 6 2 5 8 4 2 5 8 3 2 5 8 INSTALL NATURAL STEPPING STONES SEE TYPICAL SECTION THIS SHEET STONES ARE 4' + WIDE AND 6" + TALL WITH VARYING DEPTHS 8 5 2 2 L LOC/MS 520 LOC/MS 7 9 4 8 0 0 5 8 1 0 5 8 2 0 5 8 3 0 5 8 4 0 5 8 5 0 5 8 4 1 2 7 6 0 5 8 7 0 5 8 X X X X 4 1 5 8 X X X 5 1 5 8 X 0 1 5 8 X X X X 6 1 5 8 8 0 5 8 9 0 5 8 5 1 2 7 TEMPORARY STAGING AND SPOILS STORAGE AREA X X X 0 1 8 7 X X 4 5 5 X 8 X X 7 1 5 8 1 1 8 7 5 5 5 8 9 0 8 7 C O L LOC LOC/MS S C / M O L S C/M LO LOC LOC LOC LOC LOC X X X X X X X X 6 5 5 8 X X PROPOSED ACCESS PATH 8 1 5 8 LOC/MULCH SOCK APPROX. 251.5 LF 75 FT CWQZ SETBACK 5 4 5 8 8 5 5 8 3 6 5 8 X LOC/MULCH SOCK APPROX. 208.1 LF X 2 1 5 8 1 1 5 8 SEE MITIGATION PLANTING PLAN ON SHEET 5 X X X X X X X X 0 2 5 8 PROPOSED 35.7' X 42.0' DOCK SEE SHEETS 6 AND 7 FOR DOCK PLAN/ELEVATION VIEWS PROPOSED DREDGE = 23.0 CY SEE DREDGE XSECS THIS SHEET 1 3 5 8 LOC X X S M / C O L X X LOC LOC LOC LOC LOC LOC/MS LOC/MS LOC/MS LOC LOC 4 C 5 3 L O 8 C L O C O L 2 3 5 8 X X L O C X X X X 1 4 5 8 S M / C O L X X S C/M O L X X 3 3 5 8 X X L O C / M S 4 4 5 8 3 4 5 8 X X X X L O C / M S X X INSTALL TREEBOARDS 2 4 5 8 6 4 5 8 INSTALL TREEBOARDS 8 4 5 8 7 4 5 8 / S M C O L / S M C O L S M / C O L X X S M / C O L LOC/MS X X X X X X X X 6 1 2 7 2 1 8 7 L O C LO C LOC EXISTING ACCESS PATH AND BOAT DOCK TO BE DEMOLISHED 8 5 4 5 5 2 5 LOC L O C L O C 5 6 5 8 520 INSTALL MULCH SOCK APPROX. 46.2 LF 5 1 5 X S M / C O L X X L O C L O C INSTALL 5 1 0 TREEBOARDS 0 4 5 8 S M / C O L XX LOC/MS XX 9 4 5 8 0 5 5 8 LOC/MS LOC/MS 1 5 5 8 X X X L O C X X X S M / C O L X X X X 3 0 6 1 L O C / M S XX XX L O C / M S XX XX X 505 500 LOC LOC 3 5 X X 5 8 X X L O C LOC/MS X X M S MS MS INSTALL TREE FENCING APPROX. 25.0 LF S S F MORMON TAYLOR SPRING 1 MORMON TAYLOR SPRING 2 TREE 1 2 CRZ TREE CRZ L O C L O C L O C L O C L O C MS S S F S S F S S F S S F S S F L O C L O C L O C L O C L O C INSTALL TREE FENCING APPROX. 156.9 LF 510 505 INSTALL MULCH SOCK APPROX. 23.5 LF 3 5 2 1 LOC 500 LOC X X 5 6 3 X 1 X MS C O L C O L INSTALL TREEBOARDS L O C X X L O C 6 XX 5 3 8 L O C / M S 5 8 3 5 S M C O L / X X X X L O C / M S 7 3 5 8 LOC/MS XX X X / S M C O L C O L C O L C O L C O L LOC MS ' 0 . 2 4 ' 0 . 0 3 35.7' C O L C O L C O L C O L S S F S S F S S F S S F C O L C O L C O L C O L S S F S S F 9 C O L S S F 8 4 8 8 LOC 4 0 9 4 7 8 4 6 8 4 5 8 4 PROPOSED CONDITIONS FSS LOC FSS LOC LOC FSS LOC FSS LOC LOC FSS LOC FSS LOC FSS LOC LOC FSS LOC FSS LOC LOC FSS LOC FSS LOC LOC MORMON TAYLOR SPRING 2 150FT CEF SETBACK INSTALL FLOATING SILT SCREEN APPROX. 242.1 LF MORMON TAYLOR SPRING 1 150FT CEF SETBACK LIMITS OF CONSTRUCTION X X X X 7 5 5 8 X X X X X X 9 5 5 8 X X 0 6 5 8 X X X 1 6 5 8 X X X X X 2 6 5 8 9 7 5 8 3 1 8 7 X X X 8 7 EXISTING = PROPOSED FEMA 1OO-YR FLOODPLAIN/BFE ELELV = 493.2 8 5 7 7 5 8 5 7 5 8 6 7 5 8 X X X X 0 8 5 8 X X X 1 8 5 8 2 8 5 8 3 8 5 8 6 6 5 8 7 6 5 8 9 6 5 8 8 6 5 8 1 7 5 8 9 6 5 8 2 7 5 8 EXISTING = PROPOSED SHORELINE ELELV = 492.8 20 10 0 20 40 SCALE: 1" = 20' NOTES: 1. EXISTING SHORELINE LENGTH = 343.6' ALLOWABLE DOCK WIDTH = 20% OF 343.6' = 68.7' PROPOSED DOCK WIDTH = 35.5' = 10.4% PROPOSED DOCK DEPTH = 40.1' DOCK FOOTPRINT = 1200.0 SF NOTE: THE PROPOSED BOAT DOCK MUST COMPLY WITH ALL REQUIREMENTS OF LDC 25-2-1174 (“STRUCTURAL REQUIREMENTS”), AND MUST COMPLY WITH CHAPTER 25-12, ARTICLE 1 (UNIFORM BUILDING CODE) AND THE BUILDING CRITERIA MANUAL. ALL WORK SHALL OCCUR WITHIN THE LIMITS OF CONSTRUCTION AS SHOWN ON THE PLAN. ALL MATERIALS WILL BE TRANSPORTED TO THE SITE FROM WATER AND LAND. ALL CONSTRUCTION ACTIVITY, INCLUDING STAGING AND SPOIL STORAGE, WILL BE PERFORMED BY BARGE AND IN THE TEMPORARY STAGING AND SPOILS STORAGE AREA. 2. SHORELINE IMPROVEMENTS, INCLUDING GANGWAY ACCESS, ARE AUTHORIZED WITH THIS SITE PLAN. 3. CONTAINERS OF HAZARDOUS MATERIALS, FUEL, OIL, HERBICIDES, INSECTICIDES, 4. FERTILIZERS, OR OTHER POLLUTANTS WILL NOT BE STORED ON DOCKS EXTENDING INTO OR ABOVE LAKE AUSTIN. FOR LA ZONING, PERMANENT IMPROVEMENTS ARE PROHIBITED WITHIN THE SHORELINE SETBACK AREA, EXCEPT FOR RETAINING WALLS, PIERS, WHARVES, BOATHOUSES, MARINAS, OR A DRIVE TO ACCESS THE STRUCTURES [LDC 25-2-551 (B)(2)]. 5. NO WATER OR WASTEWATER UTILITIES ARE PROPOSED WITH THIS DEVELOPMENT. 6. DOCK SHALL BE AT LEAST 66% OPEN. 7. PILINGS SHALL BE 6-5/8" DIAMETER STEEL PIPE. 8. THE PROJECT SITE IS WITHIN THE CITY OF AUSTIN FULL PURPOSE BOUNDARIES.. 9. DREDGE MATERIAL SHALL BE DISPOSED DRY IN A LEGALLY PERMITTED LANDFILL SITE. PRIOR TO OFFSITE DISPOSAL, THE PERMITTEE SHALL PROVIDE THE ENVIRONMENTAL INSPECTOR WITH THE ADDRESS AND CONTACT NUMBER FOR THE DISPOSAL SITE. 10. DISPOSAL OF DREDGE SPOIL IN THE LAKE IS SPECIFICALLY PROHIBITED. ATTENTION INSPECTOR NOTES: 1. COMPLIANCE WITH BUILDING CODE REQUIRED AND IS TO BE REVIEWED FOR 2. COMPLIANCE DURING BUILDING CODE REVIEW. FOR THE BUILDING PERMIT, A SIGNED AND SEALED LETTER SHALL BE SUBMITTED TO THE CITY OF AUSTIN, PER THE LAND DEVELOPMENT CODE, 25-12-3 1612.4, CERTIFYING THAT THE STRUCTURE IS IN ACCORDANCE WITH ASCE 24, FLOOD RESISTANT DESIGN AND CONSTRUCTION. 3. 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. ' D V P P A I N O S V E R I E T A D . O N 0 2 0 2 , 3 2 R E B M E V O N 9 2 7 3 - 4 1 9 - 2 1 5 3 0 7 8 7 s a x e T , n i t s u A d a o R r e v o t s e W 5 0 5 1 8 7 9 6 1 - F r e b m u N n o i t a r t s i g e R s r e e n i g n E l a n o i s s e f o r P f o d r a o B s a x e T I I K C O D S N O T D N O C D E S O P O R P I L O R T N O C N O S O R E T U O Y A L / C L L , g n i t l u s n o C h t i m S s i n a J D A O R L L E N N O B . T M 6 3 3 3 D 4 7 2 0 - 0 2 0 2 - P S - D A O R L L E N N O B . T M 6 3 3 3 DESIGNED: JJS APPROVED: JJS SCALE: AS SHOWN 3336 MT. BONNELL ROAD DATE: 06-25-2020 SHEET of 8 4 4 SP-2020-0274D October 26, 2020 BASIS OF DETERMINATION FOR THE FINDINGS OF FACT ATTACHMENT 3 City of Austin | Environmental Commission Variance Application Guide 8  A. 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 Environmental Commission has recommended every variance application pertaining to LDC 25-8-281(C)(2)(b) for the past five years except one which included a tram. 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 entire shoreline is within the CEF setback. The existing dock is between the two springs on the Lake Austin shoreline. The replacement dock is sited north of Mormon Taylor Spring 1 and farther away from Mormon Taylor Spring 2. While it’s unlikely that runoff from the LOC will reach Mormon Taylor Spring 1, the sediment in the runoff from the limit of construction in the vicinity of Spring 1 will be controlled by two separate erosion controls: either two lines of silt fence or one line of silt fence and one line of mulch sock. b. Is the minimum deviation from the code requirement necessary to allow reasonable use of the property; YES. A dock cannot be constructed on the lot without obtaining this variance. c. Does not create a significant probability of harmful environmental consequences. YES. Overland flow from the Limit of Construction will be treated by a sequence of erosion controls. Post construction, all disturbed areas will be revegetated per the COA 609S specification. 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 existing access is in perilous condition and in need of repair. Any repair to the access will require this variance. B. 1. The criteria for granting a variance in Subsection (A) are met: YES. Please see answers to A (1), (2), and (3). 2. The requirement for which a variance is requested prevents a reasonable, economic use of the entirety of the property;  YES. The existing access is in perilous condition and in need of repair. Any repair to the access will require this variance. Denying the owner the ability to access a dock on the lakefront lot would prevent “a reasonable economic use of the entirety of the property”. 3. The variance is the minimum deviation from the code requirement necessary to allow a reasonable, economic use of the entire property; YES. The existing access is in perilous condition and is in need of repair. Any repair to the access will require this variance; so this project “is the minimum deviation from the code”. Denying the owner the ability to access a dock on the lakefront lot would prevent “a reasonable economic use of the entirety of the property”. October 26, 2020 ATTACHMENT 4 ENVIRONMENTAL RESOURCE INVENTORY City of Austin | Environmental Commission Variance Application Guide 9  City of Austin – Environmental Resource Inventory (ERI) 3336 Mount Bonnell Road Travis County, Texas December 12, 2019, revised October 5, 2020 By: DESCO Environmental Consultants, LP 26902 Nichols Sawmill Road Magnolia, Texas 77355 Natural Resources | Environmental Planning | GIS | Cultural Resources | Regulatory Permitting & Compliance 26902 Nichols Sawmill Road, Magnolia, TX 77355 | 281.252.9799 | www.descoenv.com DESCO Environmental Consultants, LP Case No.: (City use only) Environmental Resource Inventory For the City of Austin Related to LDC 25-8-121, City Code 30-5-121, ECM 1.3.0 & 1.10.0 The ERI is required for projects that meet one or more of the criteria listed in LDC 25-8-121(A), City Code 30-5-121(A). 1. SITE/PROJECT NAME: 3336 Mount Bonnell Road 2. COUNTY APPRAISAL DISTRICT PROPERTY ID (#’s): 121744 3336 Mount Bonnell Road 3. ADDRESS/LOCATION OF PROJECT: 4. WATERSHED: Austin-Travis Lakes 5. THIS SITE IS WITHIN THE (Check all that apply) Edwards Aquifer Recharge Zone* (See note below) .................. (cid:133)YES (cid:133)No Edwards Aquifer Contributing Zone*.................................. (cid:133)YES (cid:133)No Edwards Aquifer 1500 ft Verification Zone* ....................... (cid:133)YES (cid:133)No Barton Spring Zone* .......................................................... (cid:133)YES (cid:133)No *(as defined by the City of Austin – LDC 25-8-2 or City Code 30-5-2) ✔ ✔ ✔ ✔ Note: If the property is over the Edwards Aquifer Recharge zone, the Hydrogeologic Report and karst surveys must be completed and signed by a Professional Geoscientist Licensed in the State of Texas. 6. DOES THIS PROJECT PROPOSE FLOODPLAIN MODIFICATION?.......(cid:133)YES** (cid:133)NO ✔ If yes, then check all that apply: (cid:13) (1) The floodplain modifications proposed are necessary to protect the public health and safety; (cid:13) (2) The floodplain modifications proposed would provide a significant, demonstrable environmental benefit, as determined by a functional assessment of floodplain health as prescribed by the Environmental Criteria Manual (ECM), or (cid:13) (3) The floodplain modifications proposed are necessary for development allowed in the critical water quality zone under LDC 25-8-261 or 25-8-262, City Code 30-5-261 or 30-5-262. (cid:13) (4) The floodplain modifications proposed are outside of the Critical Water Quality Zone in an area determined to be in poor or fair condition by a functional assessment of floodplain health. ** If yes, then a functional assessment must be completed and attached to the ERI (see ECM 1.7 and Appendix X for forms and guidance) unless conditions 1 or 3 above apply. 7. IF THE SITE IS WITHIN AN URBAN OR SUBURBAN WATERSHED, DOES THIS PROJECT PROPOSE A UTILITY LINE PARALLEL TO AND WITHIN THE CRITICAL WATER QUALITY ZONE? ......................................................... (cid:133)YES*** (cid:133)NO ✔ ***If yes, then riparian restoration is required by LDC 25-8-261(E) or City Code 30-5-261(E) and a functional assessment must be completed and attached to the ERI (see ECM1.5 and Appendix X for forms and guidance). 4 8. There is a total of (#’s) Critical Environmental Feature(s)(CEFs) on or within150 feet of the project site. If CEF(s) are present, attach a detailed DESCRIPTION of the CEF(s), color PHOTOGRAPHS, the CEF WORKSHEET and provide DESCRIPTIONS of the proposed CEF buffer(s) and/or wetland mitigation. Provide the number of each type of CEFs on or within 150 feet of the site (Please provide the number of CEFs ): 3 (#’s) Spring(s)/Seep(s) (#’s) Point Recharge Feature(s) 1 (#’s) Canyon Rimrock(s) (#’s) Wetland(s) 0 0 0 (#’s) Bluff(s) Note: Standard buffers for CEFs are 150 feet, with a maximum of 300 feet for point recharge features. Except for wetlands, if the standard buffer is not provided, you must provide a written request for an administrative variance from LDC 25-8-281(C)(1) and provide written findings of fact to support your request. Request forms for administrative variances from requirements stated in LDC 25-8-281 are available from Watershed Protection Department. 9. The following site maps are attached at the end of this report (Check all that apply and provide): All ERI reports must include: X (cid:13) Site Specific Geologic Map with 2-ft Topography X (cid:13) Historic Aerial Photo of the Site X (cid:13) Site Soil Map X (cid:13) Critical Environmental Features and Well Location Map on current Aerial Photo with 2-ft Topography Only if present on site (Maps can be combined): X (cid:13) Edwards Aquifer Recharge Zone with the 1500-ft Verification Zone(cid:3) (cid:3) (cid:3) (Only if site is over or within 1500 feet the recharge zone) (cid:13) Edwards Aquifer Contributing Zone(cid:3) (cid:13) Water Quality Transition Zone (WQTZ) X (cid:13) Critical Water Quality Zone (CWQZ)(cid:3) X (cid:13) City of Austin Fully Developed Floodplains for all water courses with (cid:3) (cid:3) (cid:3) (cid:3) (cid:3) (cid:3) (cid:3) (cid:3) (cid:3) (cid:3) up to 64-acres of drainage 10. HYDROGEOLOGIC REPORT – Provide a description of site soils, topography, and site specific geology below (Attach additional sheets if needed): Surface Soils on the project site is summarized in the table below and uses the SCS Hydrologic Soil Groups*. If there is more than one soil unit on the project site, show each soil unit on the site soils map. Soil Series Unit Names, Infiltration Characteristics & Thickness *Soil Hydrologic Groups Definitions (Abbreviated) Soil Series Unit Name & Subgroup** Group* Thickness (feet) Brackett soils and Urban land, 12 to 30 percent slopes Gaddy soils and Urban land, 0 to 1 percent slopes, occasionally flooded Eckrant soils and Urban land, 18 to 40 percent slopes Urban land and Brackett soils, 1 to 12 percent slopes D A D C 1.0 5.0 2.5 1.5 A. Soils having a high infiltration rate when thoroughly wetted. B. Soils having a moderate infiltration rate when thoroughly wetted. C. Soils having a slow infiltration rate when thoroughly wetted. D. Soils having a very slow infiltration rate when thoroughly wetted. **Subgroup Classification – See Classification of Soil Series Table in County Soil Survey. WPD ERM ERI-2014-01 Page 2 of 6 Description of Site Topography and Drainage (Attach additional sheets if needed): The property is generally gently sloped from northeast to southwest toward the Colorado River/Lake Austin until approximately 100 feet from the shoreline, where the slope becomes much greater (up to 60-80%) in the Austin-Travis Lakes watershed, downstream of Lake Travis. The property also has a swale drainage in the central portion of the property that run from the southeast to northwest and empties into Huck's slough, northwest of the property. Mt Bonnell Rd borders the property to the northeast, a similar residential property borders the property to the northwest, and Westwood Country Club borders the property to the southeast. Lake Austin abuts the property along the southwestern boundary. Along with the main residence, one outbuilding/garage is located to the east of the main residence, and one covered boat slip/deck is located on the lake. One canyon rimrock CEF was observed just off the property (rimrock2) (Figure 3). No springs could be found during the site visit, but the City has requested three springs be included which were previously identified (Figure 3). List surface geologic units below: Geologic Units Exposed at Surface Group Trinity Comanche Peak Formation Glen Rose Formation Fredericksburg Group Member Cretaceous Comanchean Brief description of site geology (Attach additional sheets if needed): Fredericksburg Group - Edwards Limestone (EL), limestone, dolomite, and chert; limestone aphanitic-fine grained, massive-thin bedded, hard, brittle, in part rudistid biostromes, much milliolid biosparite; dolomite fine-very fine grained, porous, medium greygreyish brown; chert, nodules & plates common, varies in amount from bed to bed, some intervals free of chert, mostly white-light grey; in zone of weathering considerably recrystallized, honeycombed, & cavernous forming an aquifer, forms flat areas and plateaus bordered by scarps; thickness 60-350 ft, thins northward. Comanche Peak Limestone, fine-very fine grained, fairly hard, nodular, light grey, weathers white, extensively burrowed fillings slightly coarser & darker, typically crops out in scarp face beneath EL; thickness up to 80 ft, feathers out southward near Williamson-Travis County line. Keys Valley Marl (KVM), soft white; marine megafossils include Exogyra texana, Gryphaea mucronata, & other pelecypods, ammonites, gastropods, & echinoids; thickness up to 50 ft, feathers out southward near Williamson-Travis County line. Cedar Park Limestone lithologically & faunally similar to Comanche Peak Limestone; thickness 40 ft, south of Williamson-Travis County line upper part interfingers EL & lower part is mapped with Bee Cave Marl (BCM). BCM is lithologically and faunally similar to KVM, except Exogyrotexana are more abundant and ammonites are scarce; thickness 25-40 ft. Glen Rose Formation- limestone, dolomite, and marl subdivided into two units by Corbula bed C; alternating resistant and recessive beds forming stairstep topography; limestone aphanitic to fine grained, hard to soft and marly, light gray to yellowish gray; dolomite, fine grained, porous, yellowish brown; marine megafossils include molluscan steinkerns, rudistids, oysters, and echinoids, thickness of Glen Rose Formation is about 380 feet Wells – Identify all recorded and unrecorded wells on site (test holes, monitoring, water, oil, unplugged, capped and/or abandoned wells, etc.): There are (#) wells present on the project site and the locations are shown and labeled (#’s)The wells are not in use and have been properly abandoned. (#’s)The wells are not in use and will be properly abandoned. (#’s)The wells are in use and comply with 16 TAC Chapter 76. There are (#’s) wells that are off-site and within 150 feet of this site. 0 0 0 0 0 WPD ERM ERI-2014-01 Page 3 of 6 11. THE VEGETATION REPORT – Provide the information requested below: Brief description of site plant communities (Attach additional sheets if needed): The site is almost entirely forested with the dominant species being Ashe juniper (Juniperus ashei), live oak (Quercus virginiana), cedar elm (Ulmus crassifolia), sugar-berry (Celtis laevigata), and Texas mountain laurel (Sophora secundiflora). No hydrophytic vegetation/wetlands were observed on the property. One clump of alocasia/colocasia sp. (no wetland indicator status listed) was observed near the shoreline, but this area was not determined to contain hydric soils or wetland hydrology, so this area was not considered a wetland. There is woodland community on site …………………….(cid:133)YES (cid:133) NO (Check one). If yes, list the dominant species below: ■ Woodland species Common Name Ashe Juniper Live Oak Cedar Elm Sugar-berry Scientific Name Juniperus ashei Quercus virginiana Ulmus crassifolia Celtis laevigata Texas Mountain Laurel Sophora secundiflora There is grassland/prairie/savanna on site……………..(cid:133)YES (cid:133) NO (Check one). If yes, list the dominant species below: ■ Grassland/prairie/savanna species Common Name Scientific Name There is hydrophytic vegetation on site ………………..(cid:133)YES (cid:133) NO (Check one). If yes, list the dominant species in table below (next page): ■ WPD ERM ERI-2014-01 Page 4 of 6 Hydrophytic plant species Common Name Scientific Name Wetland Indicator Status A tree survey of all trees with a diameter of at least eight inches measured four and one- half feet above natural grade level has been completed on the site. (cid:3) (cid:133)YES (cid:133) NO (Check one). ■ 12. WASTEWATER REPORT – Provide the information requested below. Wastewater for the site will be treated by (Check of that Apply): (cid:13) On-site system(s) (cid:13) City of Austin Centralized sewage collection system (cid:13) Other Centralized collection system X Note: All sites that receive water or wastewater service from the Austin Water Utility must comply with City Code Chapter 15-12 and wells must be registered with the City of Austin The site sewage collection system is designed and will be constructed to in accordance to all State, County and City standard specifications. (cid:3) (cid:133)YES (cid:133) NO (Check one). ■ Calculations of the size of the drainfield or wastewater irrigation area(s) are attached at the end of this report or shown on the site plan. (cid:133)YES (cid:133) NO (cid:133) Not Applicable (Check one). ■ Wastewater lines are proposed within the Critical Water Quality Zone? (cid:3) (cid:133)YES (cid:133) NO (Check one). If yes, then provide justification below: ■ WPD ERM ERI-2014-01 Page 5 of 6 City of Austin Environmental Resource Inventory - Critical Environmental Feature Worksheet 1 2 3 4 9 Project Name: 3336 Mount Bonnell Road Project Address: 3336 Mount Bonnell Road Site Visit Date: December 3, 2019 Environmental Resource Inventory Date: December 12, 2019, revised October 5, 2020 5 6 7 8 Primary Contact Name: Christopher Little Phone Number: 281 252 9799 Prepared By: Christopher Little Email Address: clittle@descoenv.com {Wetland,Rimrock, Bluffs,Recharge FEATURE TYPE Feature,Spring} FEATURE ID (eg S-1) FEATURE LONGITUDE (WGS 1984 in Meters) FEATURE LATITUDE (WGS 1984 in Meters) WETLAND DIMENSIONS (ft) RIMROCK/BLUFF DIMENSIONS (ft) coordinate notation coordinate notation X Y Length Avg Height X RECHARGE FEATURE DIMENSIONS Y Z Trend Springs Est. Discharge cfs Rimrock Spring Spring Spring rimrock2 617818.087091859 Huck Slough Spring 617824.832049 Mormon Taylor Spring 1 Mormon Taylor Spring 2 617776.152948 617778.810119 3354261.73943721 3354265.36778 3354218.56255 3354190.42443 72 4 unknown unknown unknown City of Austin Use Only CASE NUMBER: For rimrock, locate the midpoint of the segment that describes the feature. For wetlands, locate the approximate centroid of the feature and the estimated area. For a spring or seep, locate the source of groundwater that feeds a pool or stream. DMS DD YES NO Wetland Rimrock Recharge Feature Spring Seep Please state the method of coordinate data collection and the approximate precision and accuracy of the points and the unit of measurement. Method Accuracy GPS Surveyed Other sub-meter (cid:3508) (cid:3508) (cid:3508) Professional Geologists apply seal below (cid:3508) (cid:3508) (cid:3508) > 1 meter meter WPD ERM ERI-CEF-01 Page 7 of 8  List of Attachments for the Environmental Resource Inventory Form Figure 1: Site Specific Geological Map with 2’ Topography Figure 2: Historical Aerial Imagery Figure 3: Site Soils Map Figure 4: Critical Environmental Features and Well Locations Figure 5: CWQZ and Fully Developed Floodplain Map Figure 6: 3336 Mount Bonnell Road - ERI Site Photos DESCO – ERI – 3336 Mount Bonnell Road – Austin, Texas Wa Kgru Kdg Kfr Figure 1: Site Specific Geologic Map with 2' Topography Legend 2' Contours (CoA) Geologic Atlas of Texas - 250K (TNRIS) Parcel of Interest (CoA) 3336 Mt. Bonnell Rd. Travis County, Texas Map Base: 2019 NC Stratmap CAP Area Imagery from TNRIS Map Datum: NAD 1983 UTM Zone 14N, meters Map Date: December 4, 2019 0 50 100 200 Feet Geologic Formation Kfr: Fredericksburg Group Kgru: Glen Rose Formation Wa: Water ¯ 1:1,400 Legend Parcel of Interest (CoA) Figure 2: Historical Aerial Imagery 3336 Mt. Bonnell Rd. Travis County, Texas Map Base: 1996 TOP CIR Aerial Imagery from TNRIS Map Datum: NAD 1983 UTM Zone 14N, meters Map Date: December 4, 2019 ¯ 1:1,400 0 50 100 200 Feet W BrF UuE TeF Lu Soil Types BrF: Brackett soils and Urban land, 12 to 30 percent slopes Lu: Gaddy soils and Urban land, 0 to 1 percent slopes, occasionally flooded TeF: Eckrant soils and Urban land, 18 to 40 percent slopes UuE: Urban land and Brackett soils, 1 to 12 percent slopes W: Water ¯ 1:1,400 Legend Figure 3: Site Soils Map 3336 Mt. Bonnell Rd. Parcel of Interest (CoA) Travis County, Texas Soils (USDA/NRCS) Map Base: 2019 Stratmap CAP Aerial Imagery from TNRIS Map Datum: NAD 1983 UTM Zone 14N, meters Map Date: December 4, 2019 0 50 100 200 Feet Rimrock 2 n Huck Slough Spring Mormon Taylor Spring 1 Mormon Taylor Spring 2 n n Legend 2' Contours (CoA) n Springs and Seeps (CoA) Canyon Rimrock (CoA/DESCO) 50' Spring and & Seep Buffer 150' Spring & Seep Buffer 50' Canyon Rimrock Buffer Parcel of Interest (CoA) Figure 4: Criticial Environmental Features and Well Locations 3336 Mt. Bonnell Rd. Travis County, Texas Map Base: 2019 Stratmap CAP Aerial Imagery from TNRIS Map Datum: NAD 1983 UTM Zone 14N, meters Map Date: September 14, 2020 0 50 100 200 Feet No Wells on this map. ¯ 1:1,400 H G U K'S SLO C U H LAKE AUSTIN Legend Parcel of Interest (CoA) Waterways (CoA) Austin Fully Developed Floodplain (CoA) CWQZ (CoA) WQTZ (CoA) Lakes (CoA) Edwards Aquifer Recharge Zone Figure 5: CWQZ and Fully Developed Floodplain Map 3336 Mt. Bonnell Rd. Travis County, Texas ¯ 1:1,400 Map Base: 2019 Stratmap CAP Aerial Imagery from TNRIS Map Datum: NAD 1983 UTM Zone 14N, meters Map Date: December 4, 2019 0 50 100 200 Feet Figure 6. 3336 Mount Bonnell Road ERI Site Photos Photo 1: Front area of the property adjacent to Mount Bonnell Road. Photo was taken from Mount Bonnell Road facing southwest. Photo 2: Front area of the property adjacent to Mount Bonnell Road. Photo was taken from the property driveway near Mount Bonnell Road facing southwest. Photo 3: Central portion of the property with bridge over swale drainage. Photo was taken from the central portion of the property facing northwest toward Huck’s Slough. Photo 4: South central portion of the property. Photo was taken from the south-central portion of the property facing the main residence toward the west. Photo 5: South-central portion of the property. Photo was taken from the south-central portion of the property facing the outbuilding/garage toward the northeast. Photo 6: Back area of the property near Lake Austin. Photo was taken from the southwestern portion of the property facing west toward the boat dock. Photo 7: Representative photo showing shoreline without wetlands. Photo was taken from the boat docks on the southwestern portion of the property facing northeast. No springs could be located along the shoreline or anywhere on the property. Three previously identified springs were added to the ERI at the City’s request. Photo 8: Rocky area determined not to be a rimrock by the City on the southwestern portion of the property. Photo is facing north.  Photo 9: Canyon Rimrock (rimrock2) located just north of the property. Photo was taken just north of the property facing northeast. Photo 10: Outbuilding/garage on the south-central area of the property. Photo was taken from the south-central portion of the property facing north, east of the main residence. APPENDIX P-1 - EROSION CONTROL NOTES 1. The contractor shall install erosion/sedimentation controls and tree/natural area protective fencing prior to any site preparation work (clearing, grubbing or excavation). 2. The placement of erosion/sedimentation controls shall be in accordance with the Environmental Criteria Manual and the approved Erosion and Sedimentation Control Plan. The COA ESC Plan shall be consulted and used as the basis for a TPDES required SWPPP. If a SWPPP is required, it shall be available for review by the City of Austin Environmental Inspector at all times during construction, including at the Pre-Construction meeting. The checklist below contains the basic elements that shall be reviewed for permit approval by COA EV Plan Reviewers as well as COA EV Inspectors. — Plan sheets submitted to the City of Austin MUST show the following: Direction of flow during grading operations. Location, description, and calculations for off-site flow diversion structures. Areas that will not be disturbed; natural features to be preserved. Delineation of contributing drainage area to each proposed BMP (e.g., silt fence, sediment basin, etc.) Location and type of E&S BMPs for each phase of disturbance. Calculations for BMPs as required. Location and description of temporary stabilization measures. Location of on-site spoils, description of handling and disposal of borrow materials, and description of on-site permanent spoils disposal areas, including size, depth of fill and revegetation procedures. Installation sequence of controls (e.g. perimeter controls, then sediment basins, then temporary stabilization, then permanent, etc.) Describe sequence of construction as it pertains to ESC including the following elements: 1. 2. Project phasing if required (LOC greater than 25 acres) 3. Sequence of grading operations and notation of temporary stabilization measures to be used 4. Schedule for converting temporary basins to permanent WQ controls 5. Schedule for removal of temporary controls 6. Anticipated maintenance schedule for temporary controls — Categorize each BMP under one of the following areas of BMP activity as described below: 3.1 Minimize disturbed area and protect natural features and soil 3.2 Control Stormwater flowing onto and through the project 3.3 Stabilize Soils 3.4 Protect Slopes 3.5 Protect Storm Drain Inlets 3.6 Establish Perimeter Controls and Sediment Barriers 3.7 Retain Sediment On-Site and Control Dewatering Practices 3.8 Establish Stabilized Construction Exits 3.9 Any Additional BMPs — Note the location of each BMP on your site map(s). — For any structural BMPs, you should provide design specifications and details and refer to them. — For more information, see City of Austin Environmental Criteria Manual 1.4. 3. The Placement of tree/natural area protective fencing shall be in accordance with the City of Austin standard Notes for Tree and Natural Area Protection and the approved Grading/Tree and Natural Area Plan. 4. A pre-construction conference shall be held on-site with the contractor, design Engineer/permit applicant and Environmental Inspector after installation of the erosion/sedimentation controls and tree/natural area protection measures and prior to beginning any site preparation work. The owner or owner's representative shall notify the Planning and Development Review Department, 974-2278, at least three days prior to the meeting date. COA approved ESC Plan and TPDES SWPPP (if required) should be reviewed by COA EV Inspector at this time. 5. Any major variation in materials or locations of controls or fences from those shown on the approved plans will require a revision and must be approved by the reviewing Engineer, Environmental Specialist or City Arborist as appropriate. Major revisions must be approved by authorized COA staff. Minor changes to be made as field revisions to the Erosion and Sedimentation Control Plan may be required by the Environmental Inspector during the course of construction to correct control inadequacies. 6. The contractor is required to provide a certified inspector with either a Certified Professional in Erosion and Sediment Control (CPESC), Certified Erosion, Sediment and Stormwater- Inspector (CESSWI) or Certified Inspector of Sedimentation and Erosion Controls (CISEC) certification to inspect the controls and fences at weekly intervals and after significant rainfall events to insure that they are functioning properly. The person(s) responsible for maintenance of controls and fences shall immediately make any necessary repairs to damaged areas. Silt accumulation at controls must be removed when the depth reaches six (6) inches. 7. Prior to final acceptance by the City, haul roads and waterway crossings constructed for temporary contractor access must be removed, accumulated sediment removed from the waterway and the area restored to the original grade and revegetated. All land clearing debris shall be disposed of in approved spoil disposal sites. 8. All work must stop if a void in the rock substrate is discovered which is; one square foot in total area; blows air from within the substrate and/or consistently receives water during any rain event. At this time it is the responsibility of the Project Manager to immediately contact a City of Austin Environmental Inspector for further investigation. 9. Temporary and Permanent Erosion Control: All disturbed areas shall be restored as noted below: A. All disturbed areas to be revegetated are required to place a minimum of six (6) inches of topsoil [see Standard Specification Item No. 601S.3(A)]. Do not add topsoil within the critical root zone of existing trees. •  Topsoil salvaged from the existing site is encouraged for use, but it should meet the standards set forth in 601S. An owner/engineer may propose use of onsite salvaged topsoil which does not meet the criteria of Standard Specification 601S by providing a soil analysis and a written statement from a qualified professional in soils, landscape architecture, or agronomy indicating the onsite topsoil will provide an equivalent growth media and specifying what, if any, soil amendments are required. •  Soil amendments shall be worked into the existing onsite topsoil with a disc or tiller to create a well-blended material. The vegetative stabilization of areas disturbed by construction shall be as follows: TEMPORARY VEGETATIVE STABILIZATION: 1. From September 15 to March 1, seeding shall be with or include a cool season cover crop: (Western Wheatgrass (Pascopyrum smithii) at 5.6 pounds per acre, Oats (Avena sativa) at 4.0 pounds per acre, Cereal Rye Grain (Secale cereale) at 45 pounds per acre. Contractor must ensure that any seed application requiring a cool season cover crop does not utilize annual ryegrass (Lolium multiflorum) or perennial ryegrass (Lolium perenne). Cool season cover crops are not permanent erosion control. 2. From March 2 to September 14, seeding shall be with hulled Bermuda at a rate of 45 pounds per acre or a native plant seed mix conforming to Items 604S or 609S. A. Fertilizer shall be applied only if warranted by a soil test and shall conform to Item No. 606S, Fertilizer. Fertilization should not occur when rainfall is expected or during slow plant growth or dormancy. Chemical fertilizer may not be applied in the Critical Water Quality Zone. B. Hydromulch shall comply with Table 1, below. C. Temporary erosion control shall be acceptable when the grass has grown at least 1½ inches high with a minimum of 95% total coverage so that all areas of a site that rely on vegetation for temporary stabilization are uniformly vegetated, and provided there are no bare spots larger than 10 square feet. D. When required, native plant seeding shall comply with requirements of the City of Austin Environmental Criteria Manual, and Standard Specifications 604S or 609S. TABLE 1: HYDROMULCHING FOR TEMPORARY VEGETATIVE STABILIZATION Material Description Longevity Typical Applications Application Rates 100% or any blend of wood, 70% or greater 0—3 Moderate slopes 1,500 to 2,000 cellulose, straw, and/or cotton Wood/Straw 30% months from flat to 3:1 lbs per acre plant material (except no mulch or less Paper or shall exceed 30% paper) Natural Fibers PERMANENT VEGETATIVE STABILIZATION: 1. From September 15 to March 1, seeding is considered to be temporary stabilization only. If cool season cover crops exist where permanent vegetative stabilization is desired, the grasses shall be mowed to a height of less than one-half (½) inch and the area shall be re-seeded in accordance with Table 2 below. Alternatively, the cool season cover crop can be mixed with Bermudagrass or native seed and installed together, understanding that germination of warm-season seed typically requires soil temperatures of 60 to 70 degrees. 2. From March 2 to September 14, seeding shall be with hulled Bermuda at a rate of 45 pounds per acre with a purity of 95% and a minimum pure live seed (PLS) of 0.83. Bermuda grass is a warm season grass and is considered permanent erosion control. Permanent vegetative stabilization can also be accomplished with a native plant seed mix conforming to Items 604S or 609S. A. Fertilizer use shall follow the recommendation of a soil test. See Item 606S, Fertilizer. Applications of fertilizer (and pesticide) on City-owned and managed property requires the yearly submittal of a Pesticide and Fertilizer Application Record, along with a current copy of the applicator's license. For current copy of the record template contact the City of Austin's IPM Coordinator. B. Hydromulch shall comply with Table 2, below. C. Water the seeded areas immediately after installation to achieve germination and a healthy stand of plants that can ultimately survive without supplemental water. Apply the water uniformly to the planted areas without causing displacement or erosion of the materials or soil. Maintain the seedbed in a moist condition favorable for plant growth. All watering shall comply with City Code Chapter 6-4 (Water Conservation), at rates and frequencies determined by a licensed irrigator or other qualified professional, and as allowed by the Austin Water Utility and current water restrictions and water conservation initiatives. D. Permanent erosion control shall be acceptable when the grass has grown at least 1½ inches high with a minimum of 95 percent for the non-native mix, and 95 percent coverage for the native mix so that all areas of a site that rely on vegetation for stability must be uniformly vegetated, and provided there are no bare spots larger than 16 square feet. E. When required, native plant seeding shall comply with requirements of the City of Austin Environmental Criteria Manual, Items 604S and 609S. TABLE 2: HYDROMULCHING FOR PERMANENT VEGETATIVE STABILIZATION Material Description Longevity Typical Applications Application Rates Bonded Fiber Matrix (BFM) 80% Organic defibrated fibers 10% Tackifier 6 months On slopes up to 2:1 2,500 to 4,000 lbs/ac and erosive soil (see manufacturers recommendations) Fiber Reinforced 65% Organic defibrated Up to 12 months On slopes up to 1:1 and 3,000 to 4,500 lbs/ac Matrix (FRM) fibers, 25% Reinforcing erosive soil conditions (see manufacturers Fibers or less, 10% recommendations) Tackifier 10.Developer Information: Owner Meg Clark Phone # c/o Chrissy Short 512-421-0800 Address 3336 Mt. Bonnell Road Owner's representative responsible for plan alterations: Janis Smith Consulting, LLC Phone # 512-914-3729 Person or firm responsible for erosion/sedimentation control maintenance: TBD Phone # TBD Person or firm responsible for tree/natural area protection Maintenance: TBD Phone # TBD 11. The contractor shall not dispose of surplus excavated material from the site without notifying the Planning and Development Review Department at 974-2278 at least 48 hours prior with the location and a copy of the permit issued to receive the material. Source: Rule No. R161-15.13, 1-4-2016. 3336 MT. BONNELL ROAD R E V I S I O N S / C O R R E C T I O N S NO. DESCRIPTION REVISE (R) TOTAL # NET ADD (A) VOID (V) SHEETS IN PLAN SET CHANGE IMP. COVER TOTAL SITE IMP. COVER (SQ. FT.)% SHEET NO.'S (SQ. FT.) CITY OF AUSTIN APPROVAL DATE DATE IMAGED OWNER: MEG CLARK 3336 MT. BONNELL ROAD AUSTIN, TX 78703 ENGINEER: JANIS J. SMITH, P.E. JANIS SMITH CONSULTING, LLC 1505 WESTOVER RD AUSTIN, TEXAS 78703 PHONE (512) 914-3729 M T . B O N N E L L R D 3 5 T H S T W . MAPSCO Map 521V City Grid B28 VICINITY MAP NTS 1. 2. 3. 4. 5. 6. CITY OF AUSTIN STANDARD NOTES FOR TREE AND NATURAL AREA PROTECTION Appendix: P-2 (3/28/2011) All trees and natural areas shown on plan to be preserved shall be protected during construction with temporary fencing. Protective fences shall be erected according to City of Austin Standards for Tree Protection. Protective fences shall be installed prior to the start of any site preparation work (clearing, grubbing or grading), and shall be maintained throughout all phases of the construction project. Erosion and sedimentation control barriers shall be installed or maintained in a manner which does not result in soil build-up within tree drip lines. Protective fences shall surround the trees or group of trees, and will be located at the outermost limit of branches (drip line), for natural areas, protective fences shall follow the Limit of Construction line, in order to prevent the following: A. Soil compaction in the root zone area resulting from vehicular traffic or storage of equipment or materials; Root zone disturbances due to grade changes (greater than 6 inches cut or fill), or trenching not reviewed and authorized by the City Arborist; B. Other activities detrimental to trees such as chemical storage, cement truck cleaning, and fires. C. Wounds to exposed roots, trunk or limbs by mechanical equipment; D. Exceptions to installing fences at tree drip-lines may be permitted in the following cases: A. Where there is to be an approved grade change, impermeable paving surface, tree well, or other such site development, erect the fence approximately 2 to 4 feet beyond the area disturbed; B. Where permeable paving is to be installed within a tree's drip-line, erect the fence at the outer limits off the permeable paving area (prior to site grading so that this area is graded separately prior to paving installation to minimize root damage); C. Where trees are close to proposed buildings, erect the fence to allow 6 to 10 feet of work space between the fence and the building; D. Where there are severe space constraints due to tract size, or other special requirements, contact the City Arborist at 512-974-1876 to discuss alternatives. SPECIAL NOTES: For the protection of natural areas, no exceptions to installing fences at the Limit of Construction line will be permitted. 7. Where any of the above exceptions result in a fence being closer than 4 feet to a tree trunk, protect the trunk with strapped-on planking to a height of 8 feet (or to the limits of lower branching) in addition to the reduced fencing provided. Trees approved for removal shall be removed in a manner which does not impact trees to be preserved. Any roots exposed by construction activity shall be pruned flush with the soil. Backfill root areas with good quality top soil as soon as possible. If exposed root areas are not backfilled within 2 days, cover them with organic material in a manner which reduces soil temperature and minimizes water loss due to evaporation. 8. 9. 10. Any trenching required for the installation of landscape irrigation shall be placed as far from existing tree 11. No landscape topsoil dressing greater than 4 inches shall be permitted within the drip-line of trees. No soil is 12. Pruning to provide clearance for structures, vehicular traffic and equipment shall take place before damage trunks as possible. permitted on the root flare of any tree. occurs (ripping of branches, etc.). 13. All finished pruning shall be done according to recognized, approved standards of the industry (Reference the National Arborist Association Pruning Standards for Shade Trees available on request from the City Arborist). 14. Deviations from the above notes may be considered ordinance violations if there is substantial non-compliance or if a tree sustains damage as a result. APPENDIX P-6 - REMEDIAL TREE CARE NOTES AERATION AND SUPPLEMENTAL NUTRIENT REQUIREMENTS FOR TREES WITHIN CONSTRUCTION AREAS As a component of an effective remedial tree care program per Environmental Criteria Manual section 3.5.4, preserved trees within the limits of construction may require soil aeration and supplemental nutrients. Soil and/or foliar analysis should be used to determine the need for supplemental nutrients. The City Arborist may require these analyses as part of a comprehensive tree care plan. Soil pH shall be considered when determining the fertilization composition as soil pH influences the tree's ability to uptake nutrients from the soil. If analyses indicate the need for supplemental nutrients, then humate/nutrient solutions with mycorrhizae components are highly recommended. In addition, soil analysis may be needed to determine if organic material or beneficial microorganisms are needed to improve soil health. Materials and methods are to be approved by the City Arborist (512-974-1876) prior to application. The owner or general contractor shall select a fertilization contractor and iensure coordination with the City Arborist. Pre-construction treatment should be applied in the appropriate season, ideally the season preceding the proposed construction. Minimally, areas to be treated include the entire critical root zone of trees as depicted on the City approved plans. Treatment should include, but not limited to, fertilization, soil treatment, mulching, and proper pruning. Post-construction treatment should occur during final revegetation or as determined by a qualified arborist after construction. Construction activities often result in a reduction in soil macro and micro pores and an increase in soil bulk density. To ameliorate the degraded soil conditions, aeration via water and/or air injected into the soil is needed or by other methods as approved by the City Arborist. The proposed nutrient mix specifications and soil and/or foliar analysis results need to be provided to and approved by the City Arborist prior to application (Fax # 512-974-3010). Construction which will be completed in less than 90 days may use materials at ½ recommended rates. Alternative organic fertilizer materials are acceptable when approved by the City Arborist. Within 7 days after fertilization is performed, the contractor shall provide documentation of the work performed to the City Arborist, Planning and Development Review Department. P.O. Box 1088, Austin, TX 78767. This note should be referenced as item #1 in the Sequence of Construction GENERAL NOTES: This project is located over the Edwards Aquifer recharge zone. Deed restrictions or restrictive covenants are not applicable to this property. A business or living quarter may not be constructed on a pier or similar structure extending into or above Lake Austin, except under a license agreement approved by the City Council (Section 25-2-1176(H). Contractor to verify utility locations and ground and flow line elevations before construction. 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. Approval of these plans by the City of Austin indicates compliance with applicable City regulations only. Approval by other government entities may be required prior to the start of construction. The applicant is responsible for determining what additional approvals may be necessary. The following is a sequence of construction shall be used for all development. STANDARD SEQUENCE OF CONSTRUCTION Appendix: P-4 (3/28/2011) The following site plan release notes are included in accordance with the City of Austin's request. Applicant will comply with all applicable City of Austin requirements. Site Plan Release Notes: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Temporary erosion and sedimentation controls are to be installed as indicated on the approved site plan. Install tree protection and initate tree mitigation measures. (as needed) Install natural area protection and floating silt screen. (as required) The Environmental Project Manager or Site Supervisor must contact the Planning & Development Review Department, Environmental Inspection, at (512) 974-2278, 72 hours prior to the scheduled date of the required on-site preconstruction meeting. A pre-construction meeting with Environmental Inspector is required prior to any site disturbance. Temporary erosion and sedimentation controls will be revised, if needed, to comply with City Inspectors' directives, and revised construction schedule relative to the erosion plan. Construction access from water and land. Begin demolition of existing dock and construction of new dock and dock access. All loose soil and rock shall either be removed from the site or consolidated, stabilized and revegetated. Complete construction and start revegetation of the site. Upon completion of the site construction and revegetation of a project site, the design engineer shall submit an engineer's letter of concurrence to the Planning & Development Review Department indicating that construction, including revegetation, is complete and in substantial conformity with the approved plans. After receiving this letter, a final inspection will be scheduled by the appropriate City Inspector. 11. Obtain final inspection release once vegetation has 95% coverage. 12. After a final inspection has been conducted by the City Inspector and with approval from the City Inspector, remove the temporary erosion and sedimentation controls and complete any necessary final revegetation resulting from removal of the controls. AUSTIN ENERGY NOTES: 1. 2. 3. 4. 5. Austin Energy has the right to prune and/or remove trees, shrubbery and other obstructions to the extent necessary to keep the easements clear. Austin Energy will perform all tree work in compliance with Chapter 25-8, Subchapter B of the City of Austin Land Development Code. The owner/developer of this subdivision/lot shall provide Austin Energy with any easement and/or access required, in addition to those indicated, for the installation and ongoing maintenance of overhead and underground electric facilities. These easements and/or access are required to provide electric service to the building and will not be located so as to cause the site to be out of compliance with Chapter 25-8 of the City of Austin Land Development Code. The owner shall be responsible for installation of temporary erosion control, revegetation and tree protection. In addition, the owner shall be responsible for any initial tree pruning and tree removal that is within ten feet of the center line of the proposed overhead electrical facilities designed to provide electric service to this project. The owner shall include Austin Energy's work within the limits of construction for this project. The owner of the property is responsible for maintaining clearances required by the National Electric Safety Code, Occupational Safety and Health Administration (OSHA) regulations, City of Austin rules and regulations and Texas state laws pertaining to clearances when working in close proximity to overhead power lines and equipment. Austin Energy will not render electric service unless required clearances are maintained. All costs incurred because of failure to comply with the required clearances will be charged to the owner. Any relocation of electric facilities shall be at Landowner's/Developer's expense. All improvements shall be made in accordance with the released site plan. Any additional improvements will require site plan amendment and approval of the Development Services Department. All signs must comply with requirements of the Land Development Code. (Section 13-2, Article VII) Additional electric easements may be required at a later date. All existing structures shown to be removed will require a demolition permit from the City of Austin Planning & Development Review Department. A development permit must be issued prior to an application for building permit for non-consolidated or Planning Commission approved site plans. For driveway construction: The owner is responsible for all costs for relocation of, or damage to utilities. For construction within the right-of-way, a concrete permit is required. For the building permit, a signed and sealed letter shall be submitted to the City of Austin, per the Land Development Code, 25-12-3 1612.4, certifying that the structure is in accordance with ASCE 24, Flood Resistant Design and Construction. All work will occur within the limits of construction as shown on the plan. Materials and equipment will be delivered to the site via barge and land. All staging and spoils storage will occur with on the barge and in the Temporary Staging and Spoils Storage Area. Approval of this Site Plan does not include Building and Fire Code approval nor building permit approval. 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. In critical root zoned areas that cannot be protected during construction iwth 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. 1. 2. 3. 4. 5. 6. 7. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. All areas disturbed within the shoreline setback shall be restored in accordance with site plan notes and plant species listed and in accordance with City of Austin Specification 609S. All disturbed areas shall be restored as noted in erosion control & restoration notes. WATERSHED STATUS: This site is located in LAKE AUSTIN watershed, is classified as a WATER SUPPLY SUBURBAN watershed and shall be developed, constructed and maintained in conformance with Chapter 25 of the Land Development Code. SMART GROWTH ZONE: Drinking Water Protection Zone FLOODPLAIN INFORMATION: This project is within the 100-year flood plain as shown on the F.E.M.A. panel 48453C0435J effective JANUARY 6, 2016. LEGAL DESCRIPTION: LOT 1 CASWELL ESTATES ADDRESS: 3336 MT. BONNELL DR. AUSTIN, TX 78746 ZONING: SF3 USE: Accessory Use to Principal Single-Family Residence at 912 BLANCO STREET, AUSTIN, TX 78703 Release of this application does not constitute a verification of all data, information and calculations supplied by the applicant. The engineer of record is solely responsible for the completeness, accuracy and adequacy of his/her submittal, whether or not the application is reviewed for Code compliance by City engineers. Site Plan subject to City of Austin Watershed Protection Regulations. PROJECT DESCRIPTION: The project consists of the construction of a new dock and the demolition of the existing dock. Related Cases: A FORMAL VARIANCE TO LDC 25-8-281(C)(1)(a) WAS GRANTED TO ALLOW CONSTRUCTION OF A BOAT DOCK, SHORELINE ACCESS AND SHORELINE MODIFICATION WITHIN A CRITICAL ENVIRONMENTAL FEATURE (CEF) BUFFER ON XX-XX-XXXX. 4. PROPOSED CONDITIONS DOCK LAYOUT/EROSION CONTROL Plan Sheet List 1. COVER SHEET & NOTES 2. EXISTING CONDITIONS SITE PLAN 3. TREE LIST 5. DETAILS 6. PROPOSED DOCK PLANS 7. PROPOSED DOCK ELEVATIONS 8. PLAT Approved By: For Director - Development Services Department Date SP-2020-0274D Permit Number JULY 7, 2020 Submittal Date All responsibility for the adequacy of these plans remain with the engineer who prepared them. In approving these plans, the City of Austin must rely upon the adequacy of the work of the design engineer. ' D V P P A I N O S V E R I E T A D . O N 0 2 0 2 , 3 2 R E B M E V O N 9 2 7 3 - 4 1 9 - 2 1 5 3 0 7 8 7 s a x e T , n i t s u A d a o R r e v o t s e W 5 0 5 1 8 7 9 6 1 - F r e b m u N n o i t a r t s i g e R s r e e n i g n E l a n o i s s e f o r P f o d r a o B s a x e T S E T O N & T E E H S R E V O C C L L , g n i t l u s n o C h t i m S s i n a J D A O R L L E N N O B . T M 6 3 3 3 D 4 7 2 0 - 0 2 0 2 - P S - D A O R L L E N N O B . T M 6 3 3 3 DESIGNED: JJS APPROVED: JJS SCALE: AS SHOWN 3336 MT. BONNELL ROAD DATE: 06-25-2020 SHEET of 8 1 1 SP-2020-0274D 3336 MT. BONNELL ROAD CURVE # RADIUS ARC DISTANCE CHORD BEARING CHORD DISTANCE C1 275.00' 120.76' S 52°55'16" E 119.79' CURVE TABLE LINE L1 L2 L3 L4 L5 L6 L7 L8 L9 10 L11 L12 L13 L14 L15 L16 L17 LINE TABLE BEARING N 04°48'04" E N 57°37'50" E N 53°28'04" E N 57°42'59" E N 55°46'41" E N 39°54'41" E N 10°40'26" W N 40°44'33" E N 29°46'11" E N 26°35'52" E N 33°22'47" E S 65°33'51" E S 37°39'46" W S 33°54'56" W S 79°16'47" W N 28°17'04" E N 07°22'13" W LENGTH 75.56' 74.50' 84.97' 56.62' 82.28' 23.50' 57.82' 44.21' 76.46' 99.61' 3.46' 67.61' 705.04' 127.77' 130.23' 234.68' 73.57' 0 8 4 1 8 4 APPROXIMATE COLORADO RIVER GRADIENT ELEV = 482.0 2 8 4 3 8 4 MORMON TAYLOR SPRING 2 150FT CEF SETBACK MORMON TAYLOR SPRING 1 150FT CEF SETBACK TREES TO BE REMOVED SEE ENTIRE TREE LIST ON SHEET 3 MORMON TAYLOR SPRING 1 30D 18' 50.5" N 97D 46' 30.1" W EXISTING DOCK TO BE DEMOLISHED C L O C L O C L O L O C C L O L O C C L O L O C ENTIRE TREE LIST ON SHEET 3 TREES ADJACENT TO OR WITHIN LOC ARE LISTED ON THIS SHEET C O L C L O C O L C O L C L O C O L C O L L O C L O C L O C 1253 8538 1365 L O C 5 0 0 L O C 1364 S C / M O L 8535 5 0 5 L O C LO C/M 8536 S LOC 8539 1 L S C / M O L S C / M O L 8540 8537 8550 8549 S C / M O L 1603 8548 LO C/M S 8544 LO C/M S X 8551 8547 8543 L O C 8534 LO C 8533 8532 MORMON TAYLOR SPRING 2 30D 18' 49.6" N 97D 46' 30.0" W 486 485 487 488 489 490 L 1 6 C O L L 1 7 C O L 8553 L O C X X X C O L LO C/MS L O C / M S X 8546 X L O X C / M S C O L LOC C O L L O C 8565 7812 8542 L O C / M S 8541 S C / M O L L O C LOC O L S L C / M O C 8531 8530 L O C 8529 RIMROCK AND HUCK SLOUGH SPRING (50) FT.CEF SETBACK SEE PLAT NOTE 24 ON SHEET 7 PLANNING COMMISSION VARIANCE TO LDC 25-8-281(C)(1)(A) DATED 7/7/15 0 1 5 5 1 5 5 2 0 L O C / M S L O C/M S 525 LOC/MS 8527 L O C 8526 L O C M S / X X 8528 L O C / M S L2 8522 8523 8524 8525 L O C / M S L O C / M S 8511 L O C / M S 7213 L O C/M S L O C / M S 7809 LOC 75' CWQZ SETBACK C O L LOC 8521 8520 X X 8519 X X X X X X 8385 X 8387 L3 8386 RIMROCK CEF X X 8390 8388 8513 X 8512 8389 X 7808 X X X X X X 8375 X 8376 8377 X 8383 X X X 8384 L4 X 8382 8380 X X 8379 8373 X X 7806 8381 X X 8373 X 8374 X X 8370 X X 8371 8372 EXISTING = PROPOSED SHORELINE ELEV = 492.8 NO BULKHEAD WORK PROPOSED L 1 5 8567 8566 8568 8569 8569 8571 8572 8575 8576 8577 8578 8562 EXISTING ACCESS AND FENCING TO BE DEMOLISHED 8554 75 FT C W 8545 QZ SETBACK 8579 0 2 5 8563 5 2 5 LOC 7216 8518 8555 495 8583 500 8581 8580 8582 X X X X X X X X X X X X X X X X X X X X X 8554 8556 8561 8560 8559 8557 7813 X L14 FEMA 100-YR FULLY DEVELOPED FLOODPLAIN/BFE ELEV = 493.2 8558 7811 8510 8502 8497 8498 8493 8492 8501 8500 8499 X 957 8491 8485 8484 8485 8482 8516 7810 8515 X 8514 X X X X X X X X X X X X 8496 8490 8487 8495 X 8489 X 8488 X X X X X X X 8480 8481 8478 7805 X X X 8479 X X X X X X X X X X X 8455 X X X 8454 X 8453 X X L13 8449 8436 8435 X X X X X X X X X X X X X X X X X X X X 8423 X 8424 8517 EXISTING HOME 8508 8509 8507 8506 8505 8504 7215 7214 8503 0 3 5 8469 8467 8468 8464 8465 8466 8494 8483 8456 X X 8474 8471 8473 7804 8472 8477 8476 8451 8450 8434 8421 8422 8420 8443 8443 8439 8441 8440 8445 8447 8438 8437 8448 8462 8461 8457 7807 8463 8460 8459 X X X 8363 8358 8359 8355 8354 8356 8458 8470 X X X MEG CLARK LOT 1 CASWELL ESTATES DEED DOC. #2019157081 ZONING: SF3 USE: SF RESIDENCE 8475 X X 8360 8361 8362 8353 8444 8446 XX 8419 XX 8417 8418 8415 8411 8410 8412 8413 8414 8312 8313 8309 8308 8408 8311 8335 8334 8333 8319 8318 8346 8407 8409 8427 8431 8426 8432 8430 8428 8429 X X X X 8425 8406 8416 8433 L 1 2 X X 8317 X X 8316 X X M O U N T B O N N E L L R O A D 7802 7803 8315 8314 8310 7801 X 8302 8301 8303 8304 8305 8307 8306 X X X X X X C 1 X X X X X CITY OF AUSTIN ABS 744 SUR 1 SILSBEE A ABS 708 SURF 610 STROTHER C J ACR 2.23 DEED DOC. # NOT AVAILABLE ZONING: SF3 USE: XX HUCK SLOUGH SPRING 30D 18' 52.0" N 97D 46' 28.3" W X X X X 8399 8401 X 8400 L8 X X L 9 X X X 8350 X X X 8339 8338 8337 8336 X 8351 8352 8349 8340 X X X X 8331 X 8329 8330 8403 8402 8391 8341 8320 X X L11 X 8325 X 8324 8323 8326 8322 X X 8321 L 1 0 X X X 8328 8327 8332 L5 8367 X 8368 X 8369 8365 X X X 8366 X 8364 X L7 X 8398 X X X X L6 X X X X X X X X X 8397 8396 8395 8394 8393 8392 8405 8342 8344 8348 8343 8345 8404 8347 WESTWOOD COUNTRY CLUB ABS 313 SUR B GILBERT D J ACR 11.362 DEED DOC. # NOT AVAILABLE ZONING: SF3 USE: SF RESIDENCE EXISTING CONDITIONS LEGEND EXISTING SHORELINE EXISTING RIMROCK CEF EXISTING RIMROCK CEF SETBACK CWQZ SETBACK FEMA 100-YR FLOODPLAIN/BFE EXISTING IMPERVIOUS COVER EXISTING STRUCTURES TO BE DEMOLISHED LOC LOC LIMIT OF CONSTRUCTION LOC/MS LOC/MS LIMIT OF CONSTRUCTION/MULCH SOCK TREE # TREE CRITICAL ROOT ZONE AND 1 2 CRZ 40 20 0 40 80 SCALE: 1" =40' ' D V P P A I N O S V E R I E T A D . O N 0 2 0 2 , 3 2 R E B M E V O N 9 2 7 3 - 4 1 9 - 2 1 5 3 0 7 8 7 s a x e T , n i t s u A d a o R r e v o t s e W 5 0 5 1 8 7 9 6 1 - F r e b m u N n o i t a r t s i g e R s r e e n i g n E l a n o i s s e f o r P f o d r a o B s a x e T I I N A L P E T S S N O T D N O C G N T S X E I I I C L L , g n i t l u s n o C h t i m S s i n a J D A O R L L E N N O B . T M 6 3 3 3 D 4 7 2 0 - 0 2 0 2 - P S - D A O R L L E N N O B . T M 6 3 3 3 DESIGNED: JJS APPROVED: JJS SCALE: AS SHOWN 3336 MT. BONNELL ROAD DATE: 06-25-2020 SHEET of 8 2 2 SP-2020-0274D TREE LIST TREE LIST TREE LIST TREE LIST TREE # CALIPER SIZE TREE TYPE TREE # CALIPER SIZE TREE TYPE TREE # CALIPER SIZE TREE TYPE TREE # CALIPER SIZE TREE TYPE TREE # CALIPER SIZE TREE TYPE TREE LIST MULTI-TRUNK: 8" 8" 6.5" 17.5" LIVE OAK 3336 MT. BONNELL ROAD MULTI-TRUNK: 8" 3.5" 3.5" LIGUSTRUM MULTI-TRUNK: 6.5" 5" 3.5" 2" LIGUSTRUM MULTI-TRUNK: 11" 11" HACKBERRY MULTI-STEM: 5" 4.5" 3.5" LIGUSTRUM MULTI-TRUNK: 7" 7" 6" 5" 4.5" MULTI-TRUNK: 10"10" CEDAR ELM MULTI-STEM: 5.5" 4" 3.5" CEDAR ELM MULTI-STEM: 8" 7.5" HACKBERRY MULTI-TRUNK: 8.5" 5" MULTI-STEM: 8" 5" MULTI-TRUNK: 7" 4.5" MULTI-STEM: 6" 5" MULTI-TRUNK: 6.5" 6" MULTI-TRUNK: 6" 4.5" LIGUSTRUM MULTI-TRUNK: 9" 9" 6" 4.5" 2.5" SPANISH OAK MULTI-TRUNK: 6.5" 4" LIGUSTRUM MULTI-TRUNK: 16" 14.5" LIVE OAK MULTI-TRUNK: 12.5" 8" 5" CEDAR MULTI-TRUNK: 16.5"13.5" SHIN OAK MULTI-STEM: 16"11" MULTI-TRUNK: 19.5" 10.5" MULTI-TRUNK: 24" 13.5" MULTI-STEM: 18.5" 14.5" MULTI-STEM: 11"5" SPANISH OAK MULTI-TRUNK: 9" 7" MULTI-TRUNK: 7.5" 6" MULTI-TRUNK: 9" 4.5" 2.5" 2" RED OAK MULTI-STEM: 12" 10.5" 8" MULTI-TRUNK: 9.5"8.5" MULTI-TRUNK: 11" 9.5" MULTI-STEM: 10"5.5" 957 1253 1364 * 1365 1603 7213 7214 7215 7216 7801 7802 7803 7804 7805 7806 7807 7808 7809 7810 7811 7812 7813 8301 8302 8303 8304 8305 8306 8307 8308 8309 8310 8311 8312 8313 8314 8315 8316 8317 8318 8319 8320 8321 8322 8323 8324 8325 8326 8327 8328 8329 8330 8331 8332 8333 8334 8335 8336 8337 8338 8339 8340 8341 8342 15" 20" 20" 12" 14" 15" 18" 18.5" 31" 20.5" 19" 29" 33.5" 8.5" 8.5" 8" 12" 12.5" 10" 8" 10" 8" 10" 11.5" 10.5" 10.5" 11" 8" 8" 13" 20.5" 12" 13" 13.5" 11" 9" 10" 10.5" 9" 8.5" 9" PALM PALM PALM PALM CEDAR ELM LIVE OAK LIVE OAK UNKNOWN CEDAR ELM LIVE OAK LIVE OAK LIVE OAK LIVE OAK CEDAR LIVE OAK LIVE OAK LIVE OAK LIVE OAK LIVE OAK LIVE OAK LIVE OAK LIVE OAK LIVE OAK CEDAR CEDAR CEDAR CEDAR CEDAR CEDAR CEDAR CEDAR CEDAR CEDAR CEDAR CEDAR CEDAR CEDAR CEDAR CEDAR LIVE OAK CEDAR CHINABERRY LIVE OAK CEDAR LIVE OAK HACKBERRY CEDAR ELM SHIN OAK SHIN OAK CEDAR CEDAR CEDAR 8343 8344 8345 8346 8347 8348 8349 8350 8351 8352 8354 8355 8356 8358 8359 8360 8361 8362 8363 8364 8365 8366 8367 8368 8369 8370 8371 8372 8373 8374 8375 8376 8377 8378 8379 8380 8381 8382 8383 8384 8385 8386 8387 8388 8389 8390 8391 8392 8393 8394 8395 8396 8397 8398 8399 8400 8401 8402 8403 8404 8405 8406 8407 8408 MULTI-TRUNK: 10.5" 7.5" CEDAR MULTI-TRUNK: 8.5" 6.5" SHIN OAK CHINABERRY MULTI-TRUNK: 10.5" 10" CHINABERRY MULTI-TRUNK: 5" 5" 3.5" LIGUSTRUM MULTI-TRUNK: 6" 3" 3"2" LIGUSTRUM MULTI-STEM: 7" 6" MULTI-STEM: 4" 3.5" 3.5" 2.5" LIGUSTRUM MULTI-STEM: 6" 5.5" LIGUSTRUM MULTI-TRUNK: 12.5" 9.5" LIVE OAK MULTI-TRUNK: 7" 4" MULTI-TRUNK: 14.5" 13" MULTI-TRUNK: 5.5" 5" LIGUSTRUM MULTI-TRUNK: 10" 8" MULTI-TRUNK: 10" 8" MULTI-TRUNK: 7" 6.5" CEDAR CEDAR CEDAR CEDAR CEDAR CEDAR CEDAR ELM HACKBERRY RED OAK CEDAR CEDAR LIVE OAK CEDAR ELM CEDAR ELM SHIN OAK SHIN OAK HACKBERRY CEDAR ELM CEDAR ELM RED OAK RED OAK LIVE OAK CEDAR CEDAR CEDAR CEDAR CEDAR CEDAR CEDAR CEDAR HACKBERRY CEDAR LIVE OAK SHIN OAK CEDAR ELM CEDAR ELM SHIN OAK HACKBERRY CEDAR ELM SHIN OAK CEDAR CEDAR CEDAR CEDAR RED OAK CEDAR ELM RED OAK CEDAR SHIN OAK SHIN OAK SHIN OAK CEDAR LIVE OAK CEDAR CEDAR 8409 8410 8411 8412 8413 8414 8415 8416 8417 8418 8419 8420 8421 8422 8423 8424 8425 8426 8427 8428 8429 8430 8431 8432 8433 8434 8435 8436 8437 8438 8439 8440 8441 8442 8443 8444 8445 8446 8447 8448 8449 8450 8451 8452 8453 8454 8455 8456 8457 8458 8459 8460 8461 8462 8463 8464 8465 8466 8467 8468 8469 8470 8471 8472 MULTI-TRUNK: 11.5" 10.5" MULTI-TRUNK: 11" 7" 7" MULTI-STEM: 14" 6.5" MULTI-STEM: 13" 8.5" MULTI-TRUNK: 14.5" 7" MULTI-STEM: 12.5" 11.5" 10" MULTI-STEM: 5" 3.5" 3.5" 3" LIGUSTRUM MULTI-TRUNK: 6.5" 6" MULTI-TRUNK: 8" 7" CHINABERRY LIVE OAK LIVE OAK 8" LIGUSTRUM MULTI-TRUNK: 6" 5" 3.5" LIGUSTRUM MULTI-STEM: 5.5" 4.5" 4" LIGUSTRUM MULTI-TRUNK: 7" 6.5" CEDAR MULTI-STEM: 10" 5" MULTI-STEM: 10" 9" 9" LIVE OAK LIVE OAK LIVE OAK LIVE OAK LIVE OAK CEDAR CEDAR CEDAR CEDAR CEDAR CEDAR LIVE OAK LIVE OAK LIVE OAK LIVE OAK LIVE OAK LIVE OAK LIVE OAK LIVE OAK CEDAR CEDAR LIVE OAK CEDAR ELM CEDAR LIVE OAK LIVE OAK CEDAR CEDAR HACKBERRY HACKBERRY HACKBERRY SHIN OAK CEDAR ELM RED OAK CEDAR ELM CEDAR ELM CEDAR CEDAR ELM CEDAR ELM CEDAR LIVE OAK LIVE OAK LIVE OAK CEDAR ELM CEDAR ELM CEDAR CEDAR ELM 8473 8474 8475 8476 8477 8478 8479 8480 8481 8482 8483 8484 8485 8486 8487 8488 8489 8490 8491 8492 8493 8494 8495 8496 8497 8498 8499 8500 8501 8502 8503 8504 8505 8506 8507 8508 8509 8510 8511 8512 8513 8514 8515 8516 8517 8518 8519 8520 8521 8522 8523 8524 8525 8526 8527 8528 8529 8530 8531 8532 8533 8534 8535 CHINABERRY 8536 9.5" 10.5" 11.5" 8" 10" 9" 9" 11" 8.5" 17.5" 8" 11.5" 9" 12" 14" 12" 10.5" 10.5" 8" 8.5" 12" 11.5" 24" 14.5" 11.5" 10.5" 8" 9" 12" 9" 8" 12" 9" 10" 13" 10.5" 10.5" 12" 15.5" 9.5" MULTI-TRUNK: 5.5" 5" 4" LIGUSTRUM 8" 11.5" 8" 8.5" 10.5" 17" 9.5" 12.5" 8" 11.5" 10.5" 10.5" 10.5" 11" 12.5" 9" 9" 11.5" 10.5" 8.5" 11" 11" 8" 9.5" 8" 8" 10" 8.5" 12" 11.5" 11.5" 8.5" 9" 10" 9.5" 9" 9.5" 8.5" 15.5" 8.5" 15" 9.5" 11" 9" 12" 13" 12" 10" 8.5" 9.5" 9" 10" 8.5" 14" 10" 10" 14" 11" 12" LIVE OAK CEDAR ELM CEDAR LIVE OAK LIVE OAK LIVE OAK LIVE OAK CHINABERRY CHINABERRY CEDAR CEDAR ELM LIVE OAK LIVE OAK LIVE OAK LIVE OAK HACKBERRY LIVE OAK LIVE OAK LIVE OAK CEDAR ELM LIVE OAK CEDAR ELM LIVE OAK CEDAR LIVE OAK CEDAR LIVE OAK LIVE OAK LIVE OAK LIVE OAK LIVE OAK LIVE OAK LIVE OAK LIVE OAK CEDAR ELM HACKBERRY CEDAR ELM LIVE OAK LIVE OAK CEDAR ELM CEDAR ELM CEDAR ELM CEDAR ELM CEDAR ELM CEDAR ELM CEDAR ELM HACKBERRY SPANISH OAK SPANISH OAK SPANISH OAK SPANISH OAK SPANISH OAK CEDAR ELM SPANISH OAK SPANISH OAK CEDAR ELM HACKBERRY HACKBERRY CEDAR ELM MULTI-STEM: 5.5" 5" LIGUSTRUM MULTI-TRUNK: 8" 3.5" 3" LIGUSTRUM MULTI-STEM: 7" 5.5" LIGUSTRUM MULTI-STEM: 6.5" 6" MULTI-TRUNK: 10" 7.5" 13" LIGUSTRUM MULTI-STEM: 7"2" MOUNT LAUREL MULTI-STEM: 8" 5.5" LIGUSTRUM HACKBERRY MULTI-TRUNK: 6.5"5.5"5" LIGUSTRUM 9" 10" 8" 17.5" 8.5" 9.5" 18.5" 11.5" 13" 12.5" 10" 15.5" 8.5" 13" 8" 10.5" 10.5" 11" 8" 8" 9" 12.5" 10.5" 8" 10" 9.5" 9.5" 8.5" 12.5" 13.5" 15" 9" 16.5" 9" 9" 8" 9.5" 9.5" 12.5" 9.5" 11.5" 11.5" 9" 8" 11.5" 8537 8538 8539 8540 8541 8542 8543 8544 8545 8546 8547 8548 8549 8550 8551 8552 8553 8554 8555 8556 8557 8558 8559 8560 8561 8562 8563 8564 8565 8566 8567 8568 8569 8570 8571 8572 8573 8574 8575 8576 8577 8578 8579 8580 8581 8582 8583 * * MULTI-TRUNK: 11.5" 4.5" 4.5" LIGUSTRUM MULTI-STEM: 8" 6" HACKBERRY HACKBERRY HACKBERRY HACKBERRY CEDAR ELM HACKBERRY HACKBERRY HACKBERRY HACKBERRY CEDAR ELM HACKBERRY HACKBERRY HACKBERRY CEDAR HACKBERRY CEDAR ELM CEDAR ELM CEDAR ELM LIVE OAK LIVE OAK CEDAR CEDAR ELM CEDAR ELM CEDAR ELM CEDAR ELM CEDAR ELM CEDAR ELM CHINABERRY CEDAR ELM SPANISH OAK HACKBERRY HACKBERRY CEDAR ELM CEDAR ELM PALM PALM PALM CYPRESS MULTI-TRUNK: 6"5"4.5" PERSIMMON MULTI-STEM: 6"5" MULTI-STEM: 8" 7" MULTI-STEM: 5.5" 3" 2.5" LIGUSTRUM MULTI-STEM: 8" 8" LIGUSTRUM MULTI-STEM: 7" 4.5" CEDAR ELM MULTI-TRUNK: 10" 7.5" CEDAR ELM 10" 8.5" 9.5" 12" 11" 8" 20" 14" 10.5" 8" 11.5" 8" 13" 9" 8.5" 10.5" 8" 14.5" 13" 9.5" 8.5" 11" 10.5" 8.5" 11" 8" 8.5" 9" 9.5" 10.5" 8" 20" 11.5" 12.5" 43.5" MULTI-TRUNK: 10"10" CEDAR ELM SPANISH OAK TREES PROPOSED TO BE REMOVED ARE DENOTED WITH A * ' D V P P A I N O S V E R I E T A D . O N 0 2 0 2 , 3 2 R E B M E V O N 9 2 7 3 - 4 1 9 - 2 1 5 3 0 7 8 7 s a x e T , n i t s u A d a o R r e v o t s e W 5 0 5 1 8 7 9 6 1 - F r e b m u N n o i t a r t s i g e R s r e e n i g n E l a n o i s s e f o r P f o d r a o B s a x e T I T S L E E R T C L L , g n i t l u s n o C h t i m S s i n a J D A O R L L E N N O B . T M 6 3 3 3 D 4 7 2 0 - 0 2 0 2 - P S - D A O R L L E N N O B . T M 6 3 3 3 DESIGNED: JJS APPROVED: JJS SCALE: AS SHOWN 3336 MT. BONNELL ROAD DATE: 06-25-2020 SHEET of 8 3 3 SP-2020-0274D 3336 MT. BONNELL ROAD 3 5 2 1 500 5 6 3 1 7 3 5 8 0 4 5 8 BOAT DOCK DECK EXISTING PROFILE DREDGE XSEC 1 0 0 10 10 20 20 30 30 40 40 50 50 EXISTING PROFILE BOAT DOCK DECK DREDGE XSEC 2 NOSE OF SLIP 524 EXISTING PROFILE 522 520 518 516 0 NONUNIFORM, IRREGULARLY SHAPED STEPPING STONES 20 6" MIN BEDDING MATERIAL 10 2 0 0 10 10 20 20 DREDGE APPROX. 10 CY 40 40 30 30 NOSE OF SLIP 50 50 BOAT DOCK ACCESS TYPICAL SECTION TREE # TREE CRITICAL ROOT ZONE AND 1 2 CRZ LEGEND EXISTING SHORELINE EXISTING RIMROCK CEF EXISTING RIMROCK CEF SETBACK CWQZ SETBACK FEMA 100-YR FLOODPLAIN/BFE XX FSS LOC XX FSS LOC TREE PROTECTION FLOATING SILT SCREEN LIMIT OF CONSTRUCTION LOC/MS LOC/MS LIMIT OF CONSTRUCTION/MULCH SOCK PROPOSED DOCK EXISTING DOCK/ACCESS TO BE DEMOLISHED DREDGE APPROX. 13 CY WSEL = 492.8' WSEL = 492.8' 500 500 498 498 496 496 494 494 492 492 490 488 500 500 498 498 496 496 494 494 492 492 490 488 8 6 4 8 7 6 4 8 9 6 4 8 DREDGE XSEC LOCATIONS 0 9 4 1 9 8 4 X X 2 7 3 8 X X 2 6 4 8 3 6 4 8 4 7 3 8 X 3 7 3 8 X X X X 1 8 3 8 HOUGH SLOUGH SPRING 0 8 3 8 6 0 8 7 5 7 3 8 X X X X X X X 3 7 3 8 9 7 3 8 X X X X X 2 8 3 8 X 3 8 3 8 X X X 5 X 8 3 8 X X 6 8 3 8 X X 7 8 3 8 RIMROCK X X X X X X X X 7 7 3 8 6 7 3 8 X X X X X X 8 0 8 7 3 1 5 8 0 9 3 8 9 1 5 8 9 8 3 8 8 8 3 8 X X RIMROCK 50FT CEF SETBACK SEE NOTE 24 ON THE PLAT ON SHEET 7 CITING PLANNING COMMISSION VARIANCES TO LDC 25-8-281(C)(1)(A) DATED 7/7/15 X X 3 1 2 S 7 C/M O L S C/M LO S C/M LO UTE O S C/M LO S C/M LO A H UL R S C/M LO C/MS LO 9 2 5 8 X 8 2 5 8 X X X S C/M LO LO C/M S 7 2 5 8 C O L X X C O L LOC XX L O C 0 3 5 8 X X L O C LOC/MS 525 L O X C X S M / C O L S M C/ O S C/M O L / S M C O L S M / C O L 515 1 2 5 8 5 2 5 8 S C/M LO 6 2 5 8 4 2 5 8 3 2 5 8 INSTALL NATURAL STEPPING STONES SEE TYPICAL SECTION THIS SHEET STONES ARE 4' + WIDE AND 6" + TALL WITH VARYING DEPTHS 2 2 5 8 L LOC/MS 520 LOC/MS 7 9 4 8 0 0 5 8 1 0 5 8 2 0 5 8 3 0 5 8 4 0 5 8 5 0 5 8 4 1 2 7 6 0 5 8 7 0 5 8 X X X 4 1 5 X 8 X X X 5 1 5 8 X 0 1 5 8 X X X X 6 1 5 8 8 0 5 8 9 0 5 8 5 1 2 7 TEMPORARY STAGING AND SPOILS STORAGE AREA X X X 0 1 8 7 X X 4 5 5 X 8 X X 7 1 5 8 1 1 8 7 5 5 5 8 9 0 8 7 C O L LOC LOC/MS S C / M O L S C/M LO LOC LOC LOC LOC LOC X X X X X X X 6 5 X 5 8 X X PROPOSED ACCESS PATH 8 1 5 8 LOC/MULCH SOCK APPROX. 251.5 LF 75 FT CWQZ SETBACK 4 5 5 8 8 5 5 8 3 6 5 8 X LOC/MULCH SOCK APPROX. 208.1 LF X 2 1 5 8 1 1 5 8 SEE MITIGATION PLANTING PLAN ON SHEET 5 X X X X X X X X 0 2 5 8 PROPOSED 35.7' X 42.0' DOCK SEE SHEETS 6 AND 7 FOR DOCK PLAN/ELEVATION VIEWS PROPOSED DREDGE = 23.0 CY SEE DREDGE XSECS THIS SHEET 1 3 5 8 LOC X X S M / C O L X X LOC LOC LOC LOC LOC LOC/MS LOC/MS LOC/MS LOC LOC 4 C 5 3 L O 8 C L O C O L 2 3 5 8 X X L O C X X X X 1 4 5 8 S M / C O L X X S C/M O L X X 3 3 5 8 X X L O C / M S 4 4 5 8 3 4 5 8 X X X X L O C / M S X X INSTALL TREEBOARDS 2 4 5 8 6 4 5 8 INSTALL TREEBOARDS 8 4 5 8 7 4 5 8 / S M C O L / S M C O L S M / C O L X X S M / C O L LOC/MS X X X X X X X X 6 1 2 7 2 1 8 7 L O C LO C LOC EXISTING ACCESS PATH AND BOAT DOCK TO BE DEMOLISHED 5 4 5 8 5 2 5 LOC L O C L O C 5 6 5 8 520 INSTALL MULCH SOCK APPROX. 46.2 LF 5 1 5 X S M / C O L X X L O C L O C INSTALL 5 1 0 TREEBOARDS 0 4 5 8 S M / C O L XX LOC/MS XX 9 4 5 8 0 5 5 8 LOC/MS LOC/MS 1 5 5 8 X X X L O C X X X S M / C O L X X X X 3 0 6 1 L O C / M S XX XX L O C / M S XX XX X 505 500 LOC LOC 3 5 X X 5 8 X X L O C LOC/MS X X M S MS MS INSTALL TREE FENCING APPROX. 25.0 LF S S F MORMON TAYLOR SPRING 1 MORMON TAYLOR SPRING 2 TREE 1 2 CRZ TREE CRZ L O C L O C L O C L O C L O C MS S S F S S F S S F S S F S S F L O C L O C L O C L O C L O C INSTALL TREE FENCING APPROX. 156.9 LF 510 505 INSTALL MULCH SOCK APPROX. 23.5 LF 3 5 2 1 LOC 500 LOC X X 5 6 3 X 1 X MS C O L C O L INSTALL TREEBOARDS L O C X X L O C 6 XX 5 3 8 L O C / M S 5 8 3 5 S M C O L / X X X X L O C / M S 7 3 5 8 LOC/MS XX X X / S M C O L C O L C O L C O L C O L LOC MS ' 0 . 2 4 ' 0 . 0 3 35.7' C O L C O L C O L C O L S S F S S F S S F S S F C O L C O L C O L C O L S S F S S F 9 C O L S S F 8 4 8 8 LOC 4 0 9 4 7 8 4 6 8 4 5 8 4 PROPOSED CONDITIONS FSS LOC FSS LOC LOC FSS LOC FSS LOC LOC FSS LOC FSS LOC FSS LOC LOC FSS LOC FSS LOC LOC FSS LOC FSS LOC LOC MORMON TAYLOR SPRING 2 150FT CEF SETBACK INSTALL FLOATING SILT SCREEN APPROX. 242.1 LF MORMON TAYLOR SPRING 1 150FT CEF SETBACK LIMITS OF CONSTRUCTION X X X X 7 5 5 8 X X X X X X 9 5 5 8 X X 0 6 5 8 X X X 1 6 5 8 X X X X X 2 6 5 8 9 7 5 8 3 1 8 7 X X X 8 7 EXISTING = PROPOSED FEMA 1OO-YR FLOODPLAIN/BFE ELELV = 493.2 5 8 7 7 5 8 5 7 5 8 6 7 5 8 X X X X 0 8 5 8 X X X 1 8 5 8 2 8 5 8 3 8 5 8 6 6 5 8 7 6 5 8 9 6 5 8 8 6 5 8 1 7 5 8 9 6 5 8 2 7 5 8 EXISTING = PROPOSED SHORELINE ELELV = 492.8 20 10 0 20 40 SCALE: 1" = 20' NOTES: 1. EXISTING SHORELINE LENGTH = 343.6' ALLOWABLE DOCK WIDTH = 20% OF 343.6' = 68.7' PROPOSED DOCK WIDTH = 35.5' = 10.4% PROPOSED DOCK DEPTH = 40.1' DOCK FOOTPRINT = 1200.0 SF NOTE: THE PROPOSED BOAT DOCK MUST COMPLY WITH ALL REQUIREMENTS OF LDC 25-2-1174 (“STRUCTURAL REQUIREMENTS”), AND MUST COMPLY WITH CHAPTER 25-12, ARTICLE 1 (UNIFORM BUILDING CODE) AND THE BUILDING CRITERIA MANUAL. ALL WORK SHALL OCCUR WITHIN THE LIMITS OF CONSTRUCTION AS SHOWN ON THE PLAN. ALL MATERIALS WILL BE TRANSPORTED TO THE SITE FROM WATER AND LAND. ALL CONSTRUCTION ACTIVITY, INCLUDING STAGING AND SPOIL STORAGE, WILL BE PERFORMED BY BARGE AND IN THE TEMPORARY STAGING AND SPOILS STORAGE AREA. 2. SHORELINE IMPROVEMENTS, INCLUDING GANGWAY ACCESS, ARE AUTHORIZED WITH THIS SITE PLAN. 3. CONTAINERS OF HAZARDOUS MATERIALS, FUEL, OIL, HERBICIDES, INSECTICIDES, 4. FERTILIZERS, OR OTHER POLLUTANTS WILL NOT BE STORED ON DOCKS EXTENDING INTO OR ABOVE LAKE AUSTIN. FOR LA ZONING, PERMANENT IMPROVEMENTS ARE PROHIBITED WITHIN THE SHORELINE SETBACK AREA, EXCEPT FOR RETAINING WALLS, PIERS, WHARVES, BOATHOUSES, MARINAS, OR A DRIVE TO ACCESS THE STRUCTURES [LDC 25-2-551 (B)(2)]. 5. NO WATER OR WASTEWATER UTILITIES ARE PROPOSED WITH THIS DEVELOPMENT. 6. DOCK SHALL BE AT LEAST 66% OPEN. 7. PILINGS SHALL BE 6-5/8" DIAMETER STEEL PIPE. 8. THE PROJECT SITE IS WITHIN THE CITY OF AUSTIN FULL PURPOSE BOUNDARIES.. 9. DREDGE MATERIAL SHALL BE DISPOSED DRY IN A LEGALLY PERMITTED LANDFILL SITE. PRIOR TO OFFSITE DISPOSAL, THE PERMITTEE SHALL PROVIDE THE ENVIRONMENTAL INSPECTOR WITH THE ADDRESS AND CONTACT NUMBER FOR THE DISPOSAL SITE. 10. DISPOSAL OF DREDGE SPOIL IN THE LAKE IS SPECIFICALLY PROHIBITED. ATTENTION INSPECTOR NOTES: 1. COMPLIANCE WITH BUILDING CODE REQUIRED AND IS TO BE REVIEWED FOR 2. COMPLIANCE DURING BUILDING CODE REVIEW. FOR THE BUILDING PERMIT, A SIGNED AND SEALED LETTER SHALL BE SUBMITTED TO THE CITY OF AUSTIN, PER THE LAND DEVELOPMENT CODE, 25-12-3 1612.4, CERTIFYING THAT THE STRUCTURE IS IN ACCORDANCE WITH ASCE 24, FLOOD RESISTANT DESIGN AND CONSTRUCTION. 3. 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. ' D V P P A I N O S V E R I E T A D . O N 0 2 0 2 , 3 2 R E B M E V O N 9 2 7 3 - 4 1 9 - 2 1 5 3 0 7 8 7 s a x e T , n i t s u A d a o R r e v o t s e W 5 0 5 1 8 7 9 6 1 - F r e b m u N n o i t a r t s i g e R s r e e n i g n E l a n o i s s e f o r P f o d r a o B s a x e T I I K C O D S N O T D N O C D E S O P O R P I L O R T N O C N O S O R E T U O Y A L / C L L , g n i t l u s n o C h t i m S s i n a J D A O R L L E N N O B . T M 6 3 3 3 D 4 7 2 0 - 0 2 0 2 - P S - D A O R L L E N N O B . T M 6 3 3 3 DESIGNED: JJS APPROVED: JJS SCALE: AS SHOWN 3336 MT. BONNELL ROAD DATE: 06-25-2020 SHEET of 8 4 4 SP-2020-0274D 3336 MT. BONNELL ROAD PLANTING MITIGATION CALCULATIONS 609S RESTORATION · ALL DISTURBED AREAS WITHIN THE SHORELINE SETBACK SHALL BE REVEGETATED PURSUANT TO 609S SPECIFICATIONS, USING 609S SEEDING OR PLANTING AREA OF IMPACT IS APPROXIMATELY 1020 SF PLANTING CRITERIA RECOMMENDS 1 NATIVE SHADE TREE AND 1 NATIVE UNDERSTORY TREE/500 SF OF DISTURBED AREA 1020 SF/500 SF = 3 SHADE TREES AND 3 UNDERSTORY TREES. AND 1 NATIVE SHRUB/100 SF 1020 SF/100 = 11 SHRUBS TREE MITIGATION · 14.2" REQUIRED PLANTING MITIGATION NOTES · · · · · · ALL PLANTS TO BE SOURCED WITHIN A 200 MILE RADIUS OF AUSTIN. FOLLOW ALL GUIDELINES FOUND IN THE CITY OF AUSTIN ENVIRONMENTAL CRITERIA MANUAL, REFERENCE CODE SECTIONS ECM 1.13.0, ECM 1.10.4(D), & ITEM NO. 609S AS APPLICABLE ALL PLANTS TO BE INSTALLED AT A MAXIMUM OF 3FT ON CENTERS. SHORELINE MITIGATION PLANTING SCHEDULE PLANT NAME NUMBER OF PLANTS TYPE OF MITIGATION 10 Bald Cypress (Taxodium distichum)** Mexican Plum (Prunus mexicana)** 10 White Mistflower (Ageratina havanensis)^ 5 Barbados Cherry (Malpighia glabra)^ 6 Floodplain Floodplain Floodplain Floodplain TOTAL = 31 PLANTS ** 1" caliper trees. 3 shade and 3 understory trees will fulfill the 609S requirement, and the remaining 14 trees fulfill the tree mitigation requirement. Native shrub with low water needs ^ Alternative native and adapted species may be substituted with the same quantity of another species and plant planting location maybe modified as approved by the PDR Environmental reviewer, ERM Wetland Biologist or ERM Landscape Architect. TOTAL 609S SHRUBS REQUIRED = 11 SHRUBS. 11 SHRUBS ARE PROPOSED TOTAL 609S UNDERSTORY TREES REQUIRED = 3 TREES. 3 UNDERSTORY TREES ARE PROPOSED TOTAL 609S SHADE TREES REQUIRED = 3 TREES. 3 SHADE TREES ARE PROPOSED. TOTAL 609S PLANTS REQUIRED = 17 PLANTS. 17 PLANTS PROPOSED TREE MITIGATION REQIRED = 14.2". 14" PROPOSED 5 1 2 7 9 0 5 8 LOC LOC LOC LOC 609S REVEGETATION/EROSION CONTROL MATTING MITIGATION PLANTINGS 7 1 5 8 1 1 8 7 9 0 8 7 C O L LOC LOC/MS S C / M O L S C/M LO LOC LOC LOC LOC LOC HERITAGE TREE INCHES SURVEYED 242.2 NON-APPENDIX F TREE INCHES SURVEYED 270.2 INVASIVE TREE INCHES SURVEYED 159.2 TOTAL REPLACEMENT INCHES PLANTED ON-SITE (PRIVATE TREES) 20.0 0 TOTAL REPLACEMENT ROW INCHES PLANTED 0 PRIVATE INCHES OWED TO UFRF PUBLIC INCHES OWED TO UFRF 0 6.0 TOTAL NON-MITIGATION INCHES PLANTED ON-SITE TOTAL APPENDIX F TREE INCHES REMOVED 8.5 TOTAL NON-APPENDIX F AND INVASIVES REMOVED 36.0 TOTAL MITIGATION INCHES PLANTED ON-SITE 14.0 TOTAL DEAD INCHES REMOVED 0.0 X X X X X X X X X 8 0 8 7 3 1 5 8 5 2 5 8 / S M C O L BC 4 2 5 8 0 9 3 8 X X 9 1 5 8 3 2 5 8 2 2 5 8 3 1 2 S 7 C/M O L S C/M LO S C/M LO S C/M LO 2 1 5 8 1 1 5 8 S C/M LO S C/M LO LOC/MS S C/M O L S C/M LO X 8 2 5 8 X X X LOC/MS 9 2 5 8 S C/M LO 6 2 5 8 LOC S M / C O L BC S M / C O L LOC/MS 7 2 5 8 C O L C O L 525 BC S M C/ O L 520 BC 515 BC 510 MP MP C L O MP C O L L O C L O C 505 C O L C O L BC 500 LOC C O L LOC 3 5 2 1 LOC 5 6 3 1 C O L L O C / M S 6 3 5 8 L O C / M S 5 8 3 5 S M C O L / LOC/MS 7 BC 3 5 8 / S M C O L 0 4 5 8 S M / C O L LOC/MS L1 L O C 0 3 5 8 L O C L O C 1 3 5 8 C O L 2 3 5 8 L O C 4 C 5 3 L O 8 1 4 5 8 S M / C O L S C/M O L 2 4 5 8 3 3 5 8 L O C / M S 4 4 5 8 L O C / M S 3 4 5 8 BC LOC/MS LOC/MS LOC LOC LOC LOC S M / C O L LOC/MS LOC/MS LOC/MS LOC LOC LOC LOC THE PORTION OF THE LIMITS OF CONSTRUCTION ON THE SHORE LIES IN THE CWQZ. THIS AREA 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 8 5 8 1 75 FT CWQZ SETBACK 5 4 5 8 6 1 2 7 MEXICAN PLUM 2 1 8 7 5 2 5 5 6 5 8 L O C LO C LOC / S M C O L / S M C O L 6 4 5 8 S M / C O L BC MP LOC MP MP L O C L O C L O C W S M / C O L B L O C MP S M / C O L LOC/MS B S M / C O L W 1 5 5 8 L O C / M S W B 520 BC 5 1 5 5 1 0 505 500 L17 L O C W LOC MP LOC MP MP 7 6 5 8 INSTALL EROSION CONTROL MATTING OVER ALL REVEGETATED AREA 7 8 4 5 8 4 5 8 9 4 5 8 0 5 5 8 LOC/MS LOC/MS 3 0 6 1 L O C / M S LOC/MS B B W BARBADOS CHERRY BALD CYPRESS WHITE MISTFLOWER MITIGATION PLANTING PLAN B S S F S S F S S F S S F 3 5 5 8 L O C L O C L O C L O C L O C L O C L O C C O L C O L C O L C O L C O L C O L C O L S S F S S F S S F S S F S S F ' D V P P A I N O S V E R I E T A D . O N 0 2 0 2 , 3 2 R E B M E V O N 9 2 7 3 - 4 1 9 - 2 1 5 3 0 7 8 7 s a x e T , n i t s u A d a o R r e v o t s e W 5 0 5 1 8 7 9 6 1 - F r e b m u N n o i t a r t s i g e R s r e e n i g n E l a n o i s s e f o r P f o d r a o B s a x e T I S L A T E D C L L , g n i t l u s n o C h t i m S s i n a J D A O R L L E N N O B . T M 6 3 3 3 D 4 7 2 0 - 0 2 0 2 - P S - D A O R L L E N N O B . T M 6 3 3 3 DESIGNED: JJS APPROVED: JJS SCALE: AS SHOWN 3336 MT. BONNELL ROAD DATE: 06-25-2020 SHEET of 8 5 5 SP-2020-0274D FLOATING SILT SCREEN 3336 MT. BONNELL ROAD ' D V P P A I N O S V E R I E T A D . O N 0 2 0 2 , 3 2 R E B M E V O N 9 2 7 3 - 4 1 9 - 2 1 5 3 0 7 8 7 s a x e T , n i t s u A d a o R r e v o t s e W 5 0 5 1 8 7 9 6 1 - F r e b m u N n o i t a r t s i g e R s r e e n i g n E l a n o i s s e f o r P f o d r a o B s a x e T T A L P C L L , g n i t l u s n o C h t i m S s i n a J D A O R L L E N N O B . T M 6 3 3 3 D 4 7 2 0 - 0 2 0 2 - P S - D A O R L L E N N O B . T M 6 3 3 3 DESIGNED: JJS APPROVED: JJS SCALE: AS SHOWN 3336 MT. BONNELL ROAD DATE: 06-25-2020 SHEET of 8 8 8 SP-2020-0274D Dock is at least 66% open on each side insect screens navigation lights Roof Peak T.O. Beam " 6 1 / 3 1 1 - ' 3 " 1 - ' 9 " 4 / 1 4 - ' 1 T.O. Roof Terrace Finish Floor T.O. Steel Column " 6 1 / 3 1 6 - ' 5 2 " 4 - ' 1 1 " 4 / 3 1 1 - ' 9 T.O. Boat Dock Finish Floor " 0 - ' 2 Lowest Structural Member Top of Water 492.8' " 4 / 1 3 - ' 1 / " 4 3 8 navigation lights open to beyond 5 1 2" tube steel columnns wrapped in wood (typ) steel beam per structural engineer wrapped in wood (typ) Hardie siding open to beyond 12 4 Roof Peak T.O. Beam 2" x 1/2" flat stock steel rail (typ) " 6 1 / 3 1 6 - ' 5 2 T.O. Roof Terrace Finish Floor T.O. Steel Column solid hardie siding rail (typ) 5 1 2" tube steel column per structural (typ) hardie siding Stained concrete treads " 6 1 / 3 1 1 - ' 3 " 1 - ' 9 " 4 - ' 1 1 " 0 - ' 2 " 4 / 1 4 - ' 1 " 4 / 3 1 1 - ' 9 dashed line of natural grade line of propsed grade tube steel columns support stair landing per structural engineer (typ) 04 Elevation 1/4"=1'-0" T.O. Boat Dock Finish Floor Top of Water 492.8' 2" x 1/2" flat stock steel rail (typ) tube steel columns support stair landing per structural engineer (typ) dashed line of natural grade line of propsed grade tube steel columns at base of stair steel beam per structural engineer wrapped in wood (typ) Hardie siding open to beyond Roof Peak T.O. Beam " 6 1 / 3 1 1 - ' 3 " 1 - ' 9 " 4 / 1 4 - ' 1 " 4 - ' 1 1 / " 4 3 1 1 - ' 9 T.O. Roof Terrace Finish Floor T.O. Steel Column / " 6 1 3 1 6 - ' 5 2 12 4 insect screens Dock is at least 66% open on each side Dock is at least 66% open on each side solid hardie siding rail (typ) insect screens 12 4 open to beyond navigation lights navigation lights 2" tube steel columnns 5 1 wrapped in wood (typ) T.O. Boat Dock Finish Floor Lowest Structural Member Top of Water 492.8' " 0 - ' 2 / " 4 1 3 - ' 1 " 4 / 3 8 02 Elevation 1/4"=1'-0" steel beam per structural engineer wrapped in wood (typ) open to beyond 5 1 2" tube steel column per structural wrapped in wood (typ) Install coffer walls Install coffer walls 12 4 Dock is at least 66% open on each side 2" x 1/2" flat stock steel rail (typ) open to beyond tube steel columns support stair landing per structural engineer (typ) 03 Elevation 1/4"=1'-0" Roof Peak T.O. Beam " 6 1 / 3 1 1 - ' 3 " 1 - ' 9 T.O. Roof Terrace Finish Floor T.O. Steel Column " 6 1 / 3 1 6 - ' 5 2 " 4 / 1 4 - ' 1 " 4 - ' 1 1 " 4 / 3 1 1 - ' 9 navigation lights hardie siding T.O. Boat Dock Finish Floor Lowest Strucutral Member Top of Water 492.8' " 0 - ' 2 " 4 / 1 3 - ' 1 " 4 3 / 8 01 Elevation 1/4"=1'-0" Ryan Street & Associates 2414 Exposition Boulevard Suite B140 Austin, Texas 78703 512.421.0800 1 3 7 8 7 X T , n i t s u A d a o R l l e n n o B t n u o M 6 3 3 3 Issued Permit Revision 09 October 2020 Permit 23 March 2020 Proposed Dock Elevations 7 of 8 SP-2020-0274D N I I D E P O C R O , D E G N A H C , D E C U D O R P E R E B O T T O N E R A S N A L P E S E H T . S N A L P E S E H T N I I S T H G R Y T R E P O R P R E H T O D N A T H G R Y P O C W A L N O M M O C S T I I S E V R E S E R Y L S S E R P X E s e t i a c o s s A & t e e r t S n a y R s e t i a c o s s A & t e e r t I I I S n a y R F O T N E S N O C D N A N O S S M R E P N E T T R W S S E R P X E E H T G N N A T B O T S R F T U O H T W I I I I , I I Y T R A P D R H T A O T D E N G S S A E B O T Y E H T E R A R O N , R E V E O S T A H W R E N N A M R O M R O F Y N A 3336 MT. BONNELL ROAD ' D V P P A I N O S V E R I E T A D . O N 0 2 0 2 , 5 2 R E B O T C O 9 2 7 3 - 4 1 9 - 2 1 5 3 0 7 8 7 s a x e T , n i t s u A d a o R r e v o t s e W 5 0 5 1 8 7 9 6 1 - F r e b m u N n o i t a r t s i g e R s r e e n i g n E l a n o i s s e f o r P f o d r a o B s a x e T T A L P C L L , g n i t l u s n o C h t i m S s i n a J D A O R L L E N N O B . T M 6 3 3 3 D 4 7 2 0 - 0 2 0 2 - P S - D A O R L L E N N O B . T M 6 3 3 3 DESIGNED: JJS APPROVED: JJS SCALE: AS SHOWN 3336 MT. BONNELL ROAD DATE: 06-25-2020 SHEET of 8 8 8 SP-2020-0274D