P-2 C15-2019-0055 PART2

Board of Adjustment – Jan. 13, 2020

P-2 C15-2019-0055 PART2 — original pdf

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m(ødm) _ BOA Variance hearing November 7th10/23/192803 EDGEWATER VARIANCE REVISION NOTES : Highlighted Points DELIVERABLES : Included in this package and numbers accordingly 1.Revision Notes 2.Revised Architecture Plans, Section, Trees, Rendering, and Calculations 3.Structural Letter regarding Pier&Beam Foundation 4.Civil Drawings : stamped 5.Soils Report : Bedrock 6.Nieghbor Letters HIGHLIGHTED NOTES: also included in drawings 1.Please include Neighbor Letters / Meeting Feedback 2.Footprint of house has decreased from 2,233SF to 1,848 SF 3.Impervious cover at 25%-35% Zone has decreased : from 66% to 59% 4.Impervious cover Over 35% Zone has decreased : from 29% to 17% 5.Detention is not required per residential code - we are proposing detention 6.Structural Engineer has provided a letter indicating that Pier and Beam is not a viable solution for this project. 7.Soil Report is provided - Bedrock below 24 inches. 8.Pool length has been decreased. Pool elevation has also been dropped in consideration to cut and fill 9.Cut and Fill minimized and balanced per section. 10.Surveyed Trees are in drawings indicating trees to remain and trees to be removed. 11.Retaining walls are limited to 4 feet per code 12.Foundation retaining walls are allowed to rise above 4 feet per code. 13.Civil Drawings - are present indicating drainage strategy and zero impact to adjacent neighbors. Run-Oﬀ to the street is minimized to less than a water-sprinkler. Existing conditions have been improved with our drainage plan. 13.Civil - The proposal for the construction of a home on this lot is to exceed current practice and construct a landscape wall which will serve as a “detention” wall to slow any increase in the peak run-off caused by the impervious cover. As shown in the computations, the computed release from the proposed “pond” will be the same or less than that which exists. Release from this “pond” is expected to spread and pass down the roadway as currently exists but also thick landscape edging will be included on the downslope side of the wall to further the discharge mimicking the existing condition. 14.Civil - The construction of a planned home on this lot was computed to increase the peak discharge to Edgewater by only 0.2 to 0. 3 cfs in the 500-year condition (3 to 5 percent, or arguably the equivalent of 3 or 4 lawn sprinkler zones going off at the same time). P-2/26Mark Odom Studio + 1009 WEST 6TH ST #50 + AUSTIN, TX 78703 + 512-469-5950EDGEWATER VARIANCE191023010'20'40'>35% GRADE25 - 35% GRADE>35% GRADE3/A9.01510515520525530535540545550555560565570575580STREET EDGE4' CONCRETAINING WALL2.5' CONCRETAINING WALLTRENCH DRAIN5' CONC FOUNDATIONRETAINING WALL W/WOOD FRAME ABOVEEXISTING TREES TOREMAINEXISTINGUTILITY POLELANDSCAPEWOOD DECKEXISTING TREES TOREMAINEXISTING TREES TOREMAIN2803 EDGEWATER DRIVE40' FRONT SETBACK20' REAR SETBACK10' SIDE SETBACKDRIVE1,209 SFHOUSE BUILDING COVER1,848 SF TOTALSEPTIC FIELD1,500 SFLevel 2 Overhang10' SIDE SETBACKPROPERTY LINE 100'PROPERTY LINE 139'-5"NSITE PLAN @ STREET LEVELPREVIOUS IMPERVIOUS COVER TABULATIONS BOA HEARING 10/14/19SF PER ZONEALLOWABLE %PER ZONEALLOWABLE SFPER ZONE0-15%15-25%25-35%OVER 35%--3,892 SF10,043 SF--196 SF0 SF196 SF35%10%5%0%PROJECT NAME: EDGEWATER RESIDENCELOCATION: 2803 EDGEWATER DRIVE, AUSTIN, TX 78733 ZONING: LALEGAL DESCRIPTION: LOT 8, BLOCK 1, AUSTIN LAKE ESTATES, SECTION TWO, A SUBDIVISION IN TRAVIS COUNTY, TEXAS, ACCORDING TO THE MAP OR PLAT THEREOF RECORDED IN BOOK 9, PAGE 82, TRAVIS COUNTY PLAT RECORDS.PROJECT INFORMATIONAREA BREAKDOWN (SF) PREVIOUS REVISED1ST LEVEL 1,588 1,5562nd LEVEL 1,506 1,458BALCONY 144 147GARAGE 480 0TOTAL BUILDING AREA 3,718 3,161BUILDING COVER 2,233 1,848DRIVEWAY 1,513 1,209UNCOVERED DECK 569 429OTHER 387 469TOTAL IMPERVIOUS COV. 5,469 3,955LOT SIZE 13,935 13,935TOTAL IMPER. COV. % 39% 28%PROPOSED SFPER ZONE--2,592 SF2,877 SF5,469 SFPROPOSED% PER ZONE--66 %29 %TOTALSLOPEGRADEREVISED IMPERVIOUS COVER TABULATIONS BOA HEARING 11/07/19SF PER ZONEALLOWABLE %PER ZONEALLOWABLE SFPER ZONE0-15%15-25%25-35%OVER 35%--3,892 SF10,043 SF--196 SF0 SF196 SF35%10%5%0%PROPOSED SFPER ZONE--2,279 SF1,676 SF3,811 SFPROPOSED% PER ZONE--59 %17 %TOTALSLOPEGRADEEXISTING TREE LISTTO REMAIN#42 HACKBERRY 9#45 LIVE OAK 14#46 CREPE MYRTLE 7,6,5#49 ELM 9#59 ELM 9#65 ELM 13#66 ELM 11,7#67 ELM 11#68 ELM 10#69 ELM 17#70 ELM 11#79 HACKBERRY 10#80 SHUMARD OAK 13#81 CREPE MYRTLE 8#82 ELM 19#83 ELM 8#137 ELM 10#141 ELM 8TOTAL INCHES 206TO BE REMOVED#39 HACKBERRY 8#41 HACKBERRY 9#50 ELM 12#52 ELM 11#53 ELM 10#54 ELM 16#55 HACKBERRY 10#56 ELM 13#60 ELM 8#61 ELM 8#62 ELM 15#63 ELM 10#64 ELM 15,12TOTAL INCHES 151TOTAL EXISTING TREES 357"TOTAL EXISTING TREES TO BE REMOVED 151"TOTAL EXISTING TREES TO REMAIN 206"EXISTING TREE1/2 CRZP-2/27Mark Odom Studio + 1009 WEST 6TH ST #50 + AUSTIN, TX 78703 + 512-469-5950EDGEWATER VARIANCE191023525530535540545FDWWDRMASTERBEDROOMPOWDERMASTER BATHOPEN TO ABOVEGASFIREPLACELOW BENCHOPENLOWBENCH2ND FLOOR ABOVE04'8'16'4' CONC RETAINING WALL5' CONC FOUNDATIONRETAINING WALL W/ WOODFRAME ABOVE5' CONC FOUNDATIONRETAINING WALL W/ WOODFRAME ABOVEKITCHENDININGLIVINGPOOLACACENTRYPROPERTY LINE 139'-5"10' BUILDING SETBACK10' BUILDING SETBACKPROPERTY LINE 137'-5"40' BUILDING SETBACKWOOD DECKNFLOOR PLAN - LEVEL 1P-2/28Mark Odom Studio + 1009 WEST 6TH ST #50 + AUSTIN, TX 78703 + 512-469-5950EDGEWATER VARIANCE191023525530535540545FDWWDRMASTERBEDROOMPOWDERMASTER BATHOPEN TO ABOVEGASFIREPLACELOW BENCHOPENLOWBENCH2ND FLOOR ABOVE4' CONC RETAINING WALL5' CONC FOUNDATIONRETAINING WALL W/ WOODFRAME ABOVE5' CONC FOUNDATIONRETAINING WALL W/ WOODFRAME ABOVEKITCHENDININGLIVINGPOOLACACENTRYPROPERTY LINE 139'-5"10' BUILDING SETBACK10' BUILDING SETBACKPROPERTY LINE 137'-5"40' BUILDING SETBACKWOOD DECKROOF BELOWHANDRAILOPEN TO BELOWLINPOWDERLINBUILT-INSEATBUILT-IN ENTERTAINMENTCENTERDESKDESKSHELVESBEDROOM 2BEDROOM 3OFFICELIVING SPACESTORAGE04'8'16'4' CONC RETAINING WALLBALCONYNFLOOR PLAN - LEVEL 2P-2/29Mark Odom Studio + 1009 WEST 6TH ST #50 + AUSTIN, TX 78703 + 512-469-5950EDGEWATER VARIANCE19102308'16'32'3'-0"3'-0"3'-0"4'-0"4'-0"4'-0"3'-0"EDGEWATER DR5'-0"4'-0"SITE SECTION @ HOUSEPool DeckRainwater off roof to be guttered and collected.PoolExisting GradeRain GardenLandscape RetentionWallDRIVE LEVEL15’-0”STREET LEVEL0’-0”LEVEL 127’-0”LEVEL 239’-0”ROOF49’-0”EntryLivingBedroomRain GardenP-2/30Mark Odom Studio + 1009 WEST 6TH ST #50 + AUSTIN, TX 78703 + 512-469-5950EDGEWATER VARIANCE191023P-2/31SHEETOFJOB NUMBERPROJECTSHEET NAMEREVISIONDATERCTDESIGNEDBYDRAFTEDBYDATE ISSUEDOctober, 2019THOMPSON LAND ENGINEERING, LLC Land Planning, Site Design, Subdivision Engineering P.O. Box 160062, Austin, Texas 78716 (512-328-0002)www.tleng.net email: ric@tleng.netTBPE Reg. No. F-10220 © Copyright 2012DRAINAGEGRADING & DRAINAGE CALCULATIONS2803 &2805 EDGEWATER DRIVE AUSTIN, TX111661RH 10/23/19HEC HMS MODELSCALE: 1" = 50'10050250EXISTING POWER POLESFEROSION CONTROL SILT FENCEEXISTING MAJOR CONTOURSEXISTING MINOR CONTOURSPROPOSED CONTOURSHATCHED ITEMS TO BEDEMOLISHED AND REMOVEDSTABILIZED CONSTRUCTIONENTRANCECONSTRUCTION STAGING ANDTEMP. SPOILS AREATFDTRIANGULAR FILTER DIKEIPSTORM INLET PROTECTIONLOCLIMITS OF CONSTRUCTIONEXISTING WATER LINEEXISTING WASTEWATER LINEEXISTING UNDERGROUND TELEPHONEEXISTING OVERHEAD ELECTRIC EXISTING UNDERGROUND GASRBROCK BERMMSEROSION CONTROL MULCH SOCKLEGENDEXISTING WATER METEREXISTING FIRE HYDRANTEXISTING POWER POLEEXISTING GATE VALVE88TREE TO BE REMOVED88TREE TO REMAIN88HERITAGE TREETREE PROTECTIONTPTP1EXISTING DRAINAGE AREA MAPSCALE: 1"=50'3DETENTION POND PLANSCALE: 1"=10'2PROPOSED DRAINAGE AREA MAPSCALE: 1"=50'TOP OF WALL (WIER) = 515.04TW = 515.50TW = 515.5020'0.16'511.950.12'4POND OUTFALL DETAILSCALE: NTSSCALE: 1" = 10'201050PROPOSED BUILDINGPROPOSED DRIVEWAYPROPOSED PONDE2E1P1P2PONDTW = 514.00PROPOSED DECKPROPOSED BUILDINGPROPERTY LINESCALE:5N.T.S.WALL DETAILWALL DESIGN BY OTHERS1/4" LANDSCAPE EDGING,3" ABOVE FOOTINGThompsonLandEngineering,LLC(F-10220)P-2/32P-2/33 Duffy Engineering, Inc. | 6207 Bee Caves Road #210 | Austin, Texas 78746 | phone: (512) 402-0074 | Firm Registration No. F-8637 October 21, 2019 Mark Odom Studio 1009 West 6th Street, #50 Austin, Texas 78703 Subject: Preference for foundation type Odom Residence at 2803 Edgewater Drive, Austin, Texas Job Number: 19156 Dear Mr. Odom: At your request, I reviewed the site plan to offer my preference on foundation type. The geotechnical report is not yet available, but assuming shallow bedrock and given the steep topography, I prefer a slab-on-ground foundation over a pier-and-beam for the following reasons.  Surface drainage around the house wherever possible is better than directing the water under the house. Compared to pipes or culvert under the house, surface drainage around the house is more reliable and easier to maintain with less risk of impacting the structure.  Backfill to achieve proper drainage is easier against a slab-on-ground grade beam. A pier-and-beam requires clearances for the crawlspace and vent openings that can create challenges for retaining the backfill on the uphill side.  A pier-and-beam would require additional excavation to achieve the necessary clearances. Please contact me with any questions. Sincerely, Dennis Duffy, P.E. P-2/34P-2/35P-2/36P-2/37