20210421-003a: Braker Valley C8-2020-0112 variance packet 2 of 2 — original pdf

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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: Braker Valley Tract 2. COUNTY APPRAISAL DISTRICT PROPERTY ID (#’s): 236613 & 236616 3. ADDRESS/LOCATION OF PROJECT: 11105 Cameron Rd. Austin, TX 78754 4. WATERSHED: Walnut Creek Watershed 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). 0 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 ): 0 0 (#’s) Spring(s)/Seep(s) (#’s) Point Recharge Feature(s) (#’s) Bluff(s) 0 (#’s) Canyon Rimrock(s) (#’s) Wetland(s) 0 0 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: ✔ ✔  Site Specific Geologic Map with 2-ft Topography  Historic Aerial Photo of the Site  Site Soil Map  Critical Environmental Features and Well Location Map on current ✔ ✔ Aerial Photo with 2-ft Topography Only if present on site (Maps can be combined):  Edwards Aquifer Recharge Zone with the 1500-ft Verification Zone (Only if site is over or within 1500 feet the recharge zone)  Edwards Aquifer Contributing Zone  Water Quality Transition Zone (WQTZ)  Critical Water Quality Zone (CWQZ)  City of Austin Fully Developed Floodplains for all water courses with ✔ 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) Ferris-Heiden complex, 8 to 20 percent slopes, severely eroded (FhF3) Heiden clay, 5 to 8 percent slopes, eroded (HeD2) Houston Black clay, 0 to 1 percent slopes (HnA) Houston Black clay, 1 to 3 percent slopes (HnB) Houston Black clay, 3 to 5 percent slopes, moderately eroded (HnC2) Austin-Whitewright complex, 5 to 8 percent slopes, moderately eroded (AtD2) D D D D D C 5 6.67 6.67 6.67 6.67 4 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. Braker Valeey ERI Page 2 of 6 Description of Site Topography and Drainage (Attach additional sheets if needed): The elevation of the site ranges from 586 to 650 feet above mean sea level (USGS 1988). As seen on the USGS topographic map and confirmed during the site visit, drainage on the site generally flows toward the center of the site from the east and west toward the main stream. Numerous tributaries and erosional features cut into the slopes and drain small swales that run perpendicular to the main stream on site. List surface geologic units below: Group Austin Geologic Units Exposed at Surface Formation Navarro and Taylor Groups, undiv. Member -- Brief description of site geology (Attach additional sheets if needed): The Navarro and Taylor Groups, undivided (Knt) is Late Cretaceous in age. The following is a brief description of the formation, per USGS: On Austin Sheet (1974) in areas where Pecan Gap Chalk is not present because of gradation to marl similar to that of the Marlbrook and Ozan Formations. Upper 250 ft, mostly silty, calcareous clay with sandstone beds and concretionary masses near top, some interbeds of sandstone near base. Lower 200+- ft, quartz sand, fine grained, silty, locally calcareous concretions in discontinuous beds, light gray; marine megafossils. Mapped on Sherman Sheet (1967) east of Sabine River. Taylor Group includes claystones of the Sprinkle Formation at base, chalk or marly limestones of the Pecan Gap Formation, and overlain by claystones of the Bergstrom Formation. References: Bureau of Economic Geology, 1967, Sherman Sheet, Geologic Atlas of Texas: University of Texas at Austin, Bureau of Economic Geology, scale 1:250,000. Bureau of Economic Geology, 1992, Geologic Map of Texas: University of Texas at Austin, Virgil E. Barnes, project supervisor, Hartmann, B.M. and Scranton, D.F., cartography, scale 1:500,000. 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 ___0 0 0 ___ 0 0 (#’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. Braker Valley ERI Page 3 of 6 11. THE VEGETATION REPORT – Provide the information requested below: Brief description of site plant communities (Attach additional sheets if needed): Plant communities identified on the site varies between agricultural fields and woody vegetation mixed with shrub and herbaceous species. Dominant species include: ashe juniper (Juniperus ashei), honey mesquite (Prosopis glandulosa), hackberry (Celtis occidentalis), sumpweed (Iva annua), snow-on the-prairie (Euphorbia marginata), and Bermuda grass (Cynodon dactylon). There is woodland community on site …………………….YES  NO (Check one). If yes, list the dominant species below: ✔ Woodland species Common Name ashe juniper honey mesquite hackberry cedar elm Scientific Name Juniperus ashei Prosopis glandulosa Celtis occidentalis Ulmus crassifolia There is grassland/prairie/savanna on site……………..YES  NO (Check one). If yes, list the dominant species below: ✔ Grassland/prairie/savanna species Common Name Scientific Name sumpweed snow on the prairie Bermuda grass Iva annua Euphorbia marginata Cynodon dactylon There is hydrophytic vegetation on site ………………..YES NO (Check one). If yes, list the dominant species in table below (next page): ✔ Braker Valley ERI Page 4 of 6 Hydrophytic plant species Common Name Scientific Name sumpweed broadleaf cattail Iva annua Typha latifolia Wetland Indicator Status FAC OBL 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. ✔ YES  NO (Check one). 12. WASTEWATER REPORT – Provide the information requested below. Wastewater for the site will be treated by (Check of that Apply):  On-site system(s)  City of Austin Centralized sewage collection system ✔  Other Centralized collection system 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. ✔ YES  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. YES  NO  Not Applicable (Check one). ✔ Wastewater lines are proposed within the Critical Water Quality Zone? YES  NO (Check one). If yes, then provide justification below: ✔ Braker Valley ERI Page 5 of 6 Is the project site is over the Edwards Aquifer? YES  NO (Check one). ✔ If yes, then describe the wastewater disposal systems proposed for the site, its treatment level and effects on receiving watercourses or the Edwards Aquifer. 13. One (1) hard copy and one (1) electronic copy of the completed assessment have been provided. Date(s) ERI Field Assessment was performed: 8/22/2019 and 8/26/2019 Date(s) My signature certifies that to the best of my knowledge, the responses on this form accurately reflect all information requested. Crystal Hall, P.G. Print Name Signature BGE, Inc. Name of Company (512) 879-0468 Telephone CHall@bgeinc.com Email Address 9/5/2019 Date For project sites within the Edwards Aquifer Recharge Zone, my signature and seal also certifies that I am a licensed Professional Geoscientist in the State of Texas as defined by ECM 1.12.3(A). P.G. Seal Braker Valley ERI Page 6 of 6 City of Austin Environmental Resource Inventory - Critical Environmental Feature Worksheet 1 2 3 4 9 Project Name: Braker Valley Tract Project Address: 11105 Cameron Rd. Austin, TX 78754 Site Visit Date: 8/22/2019 and 8/26/2019 Environmental Resource Inventory Date: 9/6/2019 5 6 7 8 Primary Contact Name: Crystal Hall, P.G. Phone Number: 512-879-0468 Prepared By: Crystal Hall, P.G. Email Address: CHall@bgeinc.com FEATURE TYPE {Wetland,Rimrock, Bluffs,Recharge 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 RECHARGE FEATURE DIMENSIONS Y Z Trend X Springs Est. Discharge cfs 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 sub-meter ✔ (cid:3508) GPS Surveyed (cid:3508) (cid:3508) Other Professional Geologists apply seal below ✔ (cid:3508) (cid:3508) (cid:3508) > 1 meter meter Braker Valley ERI-CEF-01 Page 7 of 8 650 0 64 630 620 630 640 6 1 0 6 5 0 650 640 BlueGooseRd. d x m . p a m s r u o t n o c d n a c g o o e G \ s p a M l i I I \ R E S G - 2 0 \ y e l l a V r e k a r B \ n o t r o H R D \ t n e i l C \ s t c e o r j \ P - 2 0 V N E S U A e c i f f \ \ \ O C X T \ : G : h t a P e l i F 5 8 0 Vicinity Map 0 8 5 £¤79 Williamson County ")71 úù620 £¤290 Hays County Travis County £¤35 £¤183 Subject Property ")71 Bastrop County GIS Analyst: wchapin 0 5 6 0 5 6 630 0 3 6 0 2 6 0 1 6 R d. C a m eron 0 4 6 Knt 0 5 6 6 2 0 6 4 0 590 6 2 6 3 0 0 0 0 6 0 1 6 0 9 5 590 Legend Subject Property 2-ft contours Geologic Units ")130 Navarro and Taylor Groups, undivided (Knt) 6 5 0 640 0 5 6 660 BGE, Inc. 101 West Louis Henna Blvd, Suite 400 Austin, TX 78728 Tel: 512-879-0400 Fax: 512-879-0499 www.bgeinc.com Braker Valley Tract ERI I Feet 0 230 460 Site Specific Geologic Map with 2-ft Topography Travis County, TX Date: February 2020 Proj. No: 7114-00 Data Source: TNRIS (2018) USGS (2019) Subject Property R d. C a m ero n BlueGooseRd. d x m . p a M l a i r e A l a c i i r o t s H \ s p a M I \ I R E S G - 2 0 \ y e l l a V r e k a r B \ n o t r o H R D \ t n e i l C \ s t c e o r j \ P - 2 0 V N E S U A e c i f f \ \ \ O C X T \ : G : h t a P e l i F Vicinity Map RM 1869 Williamson County £¤79 Legend Subject Property ")130 úù6 0 2 ")71 £¤290 Hays County Travis County £¤35 £¤183 Subject Property ")71 Bastrop County GIS Analyst: wchapin I Feet 0 200 400 BGE, Inc. 101 West Louis Henna Blvd, Suite 400 Austin, TX 78728 Tel: 512-879-0400 Fax: 512-879-0499 www.bgeinc.com Braker Valley Tract ERI Historic Aerial Photo of the Site Map (1995) Travis County, TX Date: February 2020 Proj. No: 7114-00 Data Source: USGS 2019, NHD 2017, NWI 2017, USDA 2018, TNRIS 2015 HnA HnB HnC2 R d. C a m eron HnB HnC2 HnC2 HeD2 FhF3 HnC2 HnC2 HnB FhF3 BlueGooseRd. HnC2 AtD2 Vicinity Map Legend BGE, Inc. Braker Valley Tract ERI I Williamson County £¤79 ")130 úù6 0 2 ")71 £¤290 Hays County Travis County £¤35 £¤183 Subject Property ")71 Bastrop County 0 5 6 0 5 6 0 5 6 6 4 0 0 2 6 0 3 6 6 3 0 620 0 1 6 6 1 0 6 1 0 6 1 0 0 2 6 0 1 6 0 1 6 620 630 6 0 0 610 0 3 6 6 4 0 6 3 0 6 3 0 6 2 0 6 2 0 0 2 6 630 6 2 0 0 5 6 640 0 4 6 0 3 6 6 2 0 0 2 6 0 1 6 630 0 2 6 6 1 0 0 2 6 R d. C a m ero n 650 640 640 0 65 640 0 62 640 BlueGooseRd. 6 1 0 590 600 0 9 5 610 66 0 0 7 6 0 4 6 6 8 0 6 9 0 I Feet 0 250 500 0 5 6 0 5 6 6 5 0 0 4 6 640 6 4 0 6 4 0 6 5 0 BGE, Inc. 101 West Louis Henna Blvd, Suite 400 Austin, TX 78728 Tel: 512-879-0400 Fax: 512-879-0499 www.bgeinc.com Braker Valley Tract ERI Critical Environmental Features and Well Location Map on Current Aerial Photo with 2-ft Topography Travis County, TX Date: February 2020 Proj. No: 7114-00 Data Source: Nearmap (2019) Subject Property 150-ft Subject Property Buffer 2-ft contours Note: No Critical Environmental Features or wells were identified on the Subject Property. Vicinity Map Legend 580 0 7 5 Williamson County £¤79 ")130 Travis County £¤35 Subject Property ")71 £¤183 Bastrop County úù620 ")71 £¤290 Hays County GIS Analyst: wchapin 600 630 d x m . 1 s o p o T h t i w p a M F E C \ s p a M I \ I R E S G - 2 0 \ y e l l a V r e k a r B \ n o t r o H R D \ t n e i l C \ s t c e o r j \ P - 2 0 V N E S U A e c i f f \ \ \ O C X T \ : G : h t a P e l i F R d. C a m eron BlueGooseRd. d x m . p a M e n o Z g n i t u b i r t n o C r e f i u q A s d r a w d E \ s p a M I \ I R E S G - 2 0 \ y e l l a V r e k a r B \ n o t r o H R D \ t n e i l C \ s t c e o r j \ P - 2 0 V N E S U A e c i f f \ \ \ O C X T \ : G : h t a P e l i F Vicinity Map Legend Williamson County £¤79 ")130 Travis County £¤35 Subject Property ")71 £¤183 Bastrop County úù620 ")71 £¤290 Hays County GIS Analyst: wchapin Subject Property 150-ft Subject Property Buffer Stream Pond Critical Water Quality Zone (CWQZ) BGE, Inc. 101 West Louis Henna Blvd, Suite 400 Austin, TX 78728 Tel: 512-879-0400 Fax: 512-879-0499 www.bgeinc.com Braker Valley Tract ERI I Feet 0 270 540 Critical Water Quality Zone Map Travis County, TX Date: February 2020 Proj. No: 7114-00 Data Source: TxDOT (2015) Project Area Photographs Braker Valley Tract Client: DR Horton Project Number: 7114-00 Photograph 1: Facing east, view of an upland swale on the east side of Pond 1 near the eastern subject property limits. Photograph 2: Facing south, view of an upland plain on the west side of Pond 1. Photographs taken on 8/22/2019 & 8/26/2019 by BGE, Inc. Page 1 Project Area Photographs Braker Valley Tract Client: DR Horton Project Number: 7114-00 Photograph 3: Facing southeast, view of Pond 2 from the northwest. Photograph 4: Facing west, view of Pond 1 in the southeast corner of the subject property. Photographs taken on 8/22/2019 & 8/26/2019 by BGE, Inc. Page 2 Project Area Photographs Braker Valley Tract Client: DR Horton Project Number: 7114-00 Photograph 5: Facing northwest, view upstream of Stream 2 coming off adjacent property onto the subject property. Photograph 6: Facing southeast, view downstream of Stream 3. Photographs taken on 8/22/2019 & 8/26/2019 by BGE, Inc. Page 3 Project Area Photographs Braker Valley Tract Client: DR Horton Project Number: 7114-00 Photograph 7: Facing northeast, view of Stream 1 in the center of the subject property. Photograph 8: Facing east, view of an upland plain near the western boundary of the subject property. Photographs taken on 8/22/2019 & 8/26/2019 by BGE, Inc. Page 4 Project Area Photographs Braker Valley Tract Client: DR Horton Project Number: 7114-00 Photograph 9: Facing northwest, view of downstream of Stream 5. Photograph 10: Facing southwest, view of an upland plain adjacent to removed concrete stock Pond Photographs taken on 8/22/2019 & 8/26/2019 by BGE, Inc. Page 5 Project Area Photographs Braker Valley Tract Client: DR Horton Project Number: 7114-00 Photograph 11: Facing west, view of an upland swale between Pond 3 and Stream 1. Photograph 12: Facing north, view of an upland swale where Stream 2 intersects Stream 1. Photographs taken on 8/22/2019 & 8/26/2019 by BGE, Inc. Page 6 Project Area Photographs Braker Valley Tract Client: DR Horton Project Number: 7114-00 Photograph 13: Facing north, view of the upland berm adjacent to Pond 3. Photograph 14: Facing east, view of Pond 4 and surrounding vegetation. Photographs taken on 8/22/2019 & 8/26/2019 by BGE, Inc. Page 7 R Y 0 0 1 R Y 0 0 1 100Y R R Y 0 0 1 R Y 0 0 1 R 100Y R Y 0 0 1 R Y 0 0 1 100YR R Y 0 0 1 1 0 0YR R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 4 D/OS R Y 0 0 1 3 2 1 OS R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 1 0 0 Y R 1 0 0 Y R R Y 0 0 1 100YR 100YR 34 OS 30 31 32 33 E V I R D E D A E M R I A F R 100Y R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 23 22 21 20 19 C 24 17 D/OS 18 16 SPANISH PLAINS WAY 25 26 27 28 29 30 31 33 34 35 36 37 38 40 C 32 15 14 13 12 11 10 9 8 7 6 4 3 2 C 5 6 5 4 3 36 ROW DEDICATION 35 OS 41 OS 1 2 1 J A R V I S P A T H 0 75 150 300 SCALE: 1" = 150' 8 7 6 5 4 3 2 1 17 16 15 14 13 12 11 10 9 8 7 6 5 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 MOUNUMENT VALLEY DRIVE 100YR R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 100YR 100YR 100YR 100YR R Y 0 0 1 R Y 100 100YR 100YR R Y 0 0 1 100YR 100YR 100YR 100YR R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 100YR 100YR 100YR 100YR R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 100YR 100YR 17 R E A LIT O S R U N MOUNUMENT VALLEY DRIVE 620620 27 28 P 25 24 26 42 41 43 29 30 31 32 33 34 40 39 38 37 36 35 I E V R D N E L G K R A Z O 42 41 40 39 38 36 35 34 33 31 32 ROYAL GORGE PASS 8 9 11 12 M 37 10 O 7 6 5 4 3 2 1 1 D/OS 6 2 0 2 0 6 0 2 6 6 2 0 STANWICK PASS 26 27 28 29 30 MM M 620 6 2 0 12 D/OS & WATER QUALITY 9 10 11 16 15 14 13 12 11 10 9 23 22 21 P 20 19 18 44 45 17 16 15 14 13 12 11 46 47 48 49 P 50 51 53 54 H U D S O N V A 8 7 6 5 L L E Y B E N D 4 3 2 1 G R A V I S D R I V E 23 I 52 10 9 8 7 P 6 5 4 3 2 1 W A T K N S G L E N W A Y 55 56 57 58 59 60 61 25 24 23 22 21 20 M 19 18 22 21 20 L 19 18 17 16 15 14 13 12 13 14 15 16 17 6 3 0 11 10 9 8 7 6 6 3 56356 3 M 5 5 4 3 2 HUDSON VALLEY BEND 8 7 9 L 6 5 W W 4 3 2 W W 12 11 10 W W W 1 W D/OS W W W W W W W 20 19 18 17 16 15 14 E BRAKER LANE 21 OS 9 8 7 6 K 13 12 11 CRAWFORD GLEN DRIVE 10 4 2 3 1 7 6 5 J 13 8 10 9 POAGE PASS H O LIM 7 8 11 12 O N T D RIV E 9 10 11 6 5 I 4 3 27 28 29 30 CHRIS CANYON DRIVE 31 2 32 33 34 35 18 17 16 13 D/OS 15 14 12 11 10 9 8 JEFFERSON NOTCH DRIVE 32 33 34 35 36 12 D/OS 37 38 39 40 15 14 13 11 10 9 8 5 4 3 2 1 24 25 26 23 22 21 20 G 19 23 24 25 26 27 28 29 30 31 22 21 20 19 F 18 17 16 6 2 6 0 2 5 6 3 0 6 3 0 30 29 28 27 26 25 24 W W W 31 W 23 E 22 21 W W 20 19 18 17 W W 16 15 ARAPAHO BASIN DRIVE 13 14 12 D/OS 11 7 6 5 4 W W 10 9 8 7 W W W W 6 E W W 5 4 3 W W 1 AMENITY H T A O P O W G N U S 36 37 7 6 5 38 G 39 40 41 42 4 3 2 1 41 F 42 43 44 45 N U S R O LIT A E R 1 3 2 2 1 W W 1 OS 6 4 5 W W 100YR 100YR 100YR R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 100YR 100 Y R 100YR R Y 0 0 1 5 9 5 R 100 Y R Y 0 0 1 100YR 100YR R 100Y 100YR 100YR R Y 0 0 1 108 ROW DEDICATION R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 R Y 0 0 1 6 0 0 605 6 0 5 5 0 6 610 615 6 2 0 6 2 5 6306 0630 3 635 R 100Y 330 376 367 358 B 349 397 392 9 8 7 334 338 342 350 359 400 377 383 388 B 393 398 351 360 369 E RIV W D 378 331 O L L O T H E N N A G 335 339 640 645 650 6 5 0 0 650 5 650 6 0 5 650 6 W W 5 4 6 W W R 15 16 17 18 14 15 16 17 18 20 4 3 2 28 27 29 E R I V D 6 MYSTIC VAL L E Y 6 7 8 9 10 13 12 11 5 A 4 3 2 1 W W 19 W W 343 352 361 B 370 379 384 389 394 399 107 OS W W W W G L A C I E R V A L L E Y D R I V E 10 11 12 13 14 41 40 39 38 37 36 35 34 33 OS 32 A 31 B R I D W 43 30 ROW DEDICATION 29 L L B E N D 28 27 26 25 24 23 W W 42 OS W W W W 21 22 W W Elevations Table Number Minimum Elevation Maximum Elevation Color 1 2 3 4 -11.367 -8.000 4.000 8.000 -8.000 -4.000 8.000 12.000 LEGEND EXISTING CRITICAL WATER QUALITY ZONE PROPOSED CRITICAL WATER QUALITY ZONE 100YR 100 YEAR FLOOD PLAIN PROPOSED WALLS R P A E T A D I I N O T P R C S E D V E R DESIGNED BY: AWS REVIEWED BY: CRR DRAWN BY: SAM . C N I , E G B 0 0 0 1 e t i u S l , d v B s r o t c e r i D 1 0 7 1 4 4 7 8 7 X T , I N T S U A 6 4 0 1 - F . o N n o i t a r t s g e R E P B T i i m o c . c n e g b . w w w 0 0 4 0 - 9 7 8 - 2 1 5 : L E T I I T B H X E H T P E D L L F I / T U C Y E L L A V R E K A R B S A X E T , I N T S U A W W W C8-2020-0112PA SHEET 1 OF 5 1 M P 1 3 : 8 5 : 2 1 2 0 2 / 6 2 / 1 : d e t t o P l 1 t u o y a L : t u o y a L g w d . t i i b h x E _ h p e D t l l i F - t u C V B \ s t i i \ b h x E _ 5 0 D D A C _ 3 0 \ y e l l a V _ r e k a r B _ 0 0 - 7 5 9 6 \ n o t r o H R D \ s t c e o r P C X T \ j \ : G