CITY CREEK OVERALL DEVELOPMENT PLAN/CONCEPTUAL SITE PLAN · city creek overall development plan/conceptual site plan preliminary drainage plan part of the southwest 1/4 of section

PROJECTSITE

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Ex. Gas

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Drainage Basin IDA

Vicinity Map

Scale: 1"=2000'

CITY CREEKOVERALL DEVELOPMENT PLAN/CONCEPTUAL SITE PLAN

PRELIMINARY DRAINAGE PLANPART OF THE SOUTHWEST 1/4 OF SECTION 11, THE NORTHWEST 1/4 OF SECTION 14, AND THE NORTH 1/2 OF

THE SOUTHWEST 1/4 OF SECTION 14, TOWNSHIP 1 SOUTH, RANGE 68 WEST OF THE 6TH PM, CITY OFTHORNTON, COUNTY OF ADAMS, STATE OF COLORADO

1. STORM DRAINAGE SHALL NOT ENTER ANY EXISTING IRRIGATIONCHANNELS. THE DEVELOPER WILL BE RESPONSIBLE FOR BYPASSINGTHESE FACILITIES AS REQUIRED BY THE CITY AND THE APPROPRIATEDITCH COMPANY.

2. ALL OFF-SITE EASEMENTS REQUIRED TO CONVEY DEVELOPEDDRAINAGE TO AN ACCEPTABLE OUTFALL LOCATION, AS DETERMINEDBY THE CITY, SHALL BE ACQUIRED AND RECORDED BY THE DEVELOPERPRIOR TO APPROVAL OF THE SUBDIVISION PLAT. THE RECEPTIONNUMBER(S) FOR THESE EASEMENTS SHALL BE SHOWN ON THE PLAT.

3. INFRASTRUCTURE SHALL BE PROVIDED TO ALLOW ALL UPSTREAMPARCELS WHO HISTORICALLY CONVEY DRAINAGE THROUGH THEDEVELOPMENT.

4. SEEPAGE ANALYSIS AND STRUCTURAL BANK INTEGRITY ANALYSIS FOREACH EXISTING (IF IT IS UPSTREAM) AND EACH DRAINAGEWAY WITHINTHE DEVELOPMENT SHALL BE SUBMITTED TO THE CITY WITH THE FIRSTSUBDIVISION PLAT FOR THE PROPERTY.

5. A NOTE SHALL BE ADDED TO INDICATE HOW NUISANCE FLOWS WILLBE HANDLED THROUGH PARCELS DOWNSTREAM OF THEDEVELOPMENT AND IF ANY EASEMENTS ARE ANTICIPATED TO BEACQUIRED BY THE DEVELOPER. THIS MAY INCLUDE LETTERS OFACKNOWLEDGEMENT FROM THE DOWNSTREAM PROPERTY OWNER(S)BETWEEN THE PROPOSED DEVELOPMENT AND AN APPROVEDDRAINAGEWAY, IF APPLICABLE.

6. THE IMPROVEMENTS SHALL CONFORM TO THE CURRENT MASTERDRAINAGE PLAN AT THE TIME OF DEVELOPMENT. IF THERE IS NOT AMASTER PLAN AT THE TIME OF DEVELOPMENT, THE DEVELOPER WILLBE REQUIRED TO PREPARE A BASIN STUDY TO DETERMINE THE IMPACTSAND IDENTIFY MITIGATION MEASURE FOR THE PROPOSED PROJECT.APPROVAL IS REQUIRED FROM URBAN DRAINAGE AND FLOODCONTROL DISTRICT (UDFCD) FOR THESE IMPROVEMENTS. STORMWATER QUALITY AND DETENTION ARE REQUIRED FOR ALL PORTIONSOF THE DEVELOPMENT INCLUDING THE ULTIMATE ROADWAYCONSTRUCTION.

7. CLOMR'S/LOMR'S WILL BE REQUIRED WITH THIS DEVELOPMENT IFADJUSTMENTS TO THE FLOODPLAIN ARE PROPOSED.

8. ALL WETLANDS AND BODIES OF WATER SHALL BE IDENTIFIED ON THEDRAINAGE PLAN. NO LOTS SHALL BE WITHIN A 50 FOOT RADIUS OF ADELINEATED WETLANDS AND 75 FOOT RADIUS OF ANY BODY OFWATER.

9. DETENTION PONDS SHALL BE COMBINED WHEREVER POSSIBLE ANDSHALL BE SIZED USING CUHP OR AN EQUIVALENT INFLOWHYDROGRAPH METHOD.

10. ACCESS SHALL BE PROVIDED TO ALL DRAINAGEWAYS AND DETENTIONPOND(S) FOR MAINTENANCE.

11. THE EXISTING POND IN MUSTANG RUN WILL NEED TO BE BREACHEDUNLESS THERE ARE WATER RIGHTS ASSOCIATED WITH IT.

CITY DEVELOPMENT9500 CIVIC CENTER DRIVE

THORNTON, COLORADO 80229PHONE: 303-538-7295

4300 CHERRY CREEK DRIVE SOUTHDENVER, COLORADO 80246-1530

PHONE: 303-692-2000

12071 TEJON STREET, SUITE 470WESTMINSTER, COLORADO 80234

PHONE: 303-421-4224CONTACT: TESS HOGAN, P.E. #28789

12460 1ST STREETEASTLAKE, COLORADO 80614

PHONE: 303-457-2966CONTACT: CLARKE CARLSON

Sheet List TableSheet Number Sheet Title

1 Cover Sheet

2 Historic Drainage Plan

3 Historic Drainage Plan

4 Proposed Drainage Plan

5 Proposed Drainage Plan

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THE FOLLOWING PAGES HAVE BEEN PROVIDED TO ILLUSTRATE THE EXISTING AND PROPOSED DRAINAGE CHARACTERISTICSOF THE CITY CREEK DEVELOPMENT. THE OVERALL PROJECT WILL DEVELOP APPROXIMATELY 356 ACRES OF EXISTINGPROPERTY LARGELY CONSISTING OF OPEN SPACE IN THE CURRENT CONDITION. FOUR EXISTING DRAINAGE CONVEYANCEFACILITIES LIE WITHIN THE SCOPE OF THE PROJECT:1. MUSTANG RUN TRAVERSES THE SITE FROM WEST TO EAST,2. BIG DRY CREEK DRAINS IN A NORTHERLY DIRECTION THROUGH THE SOUTHEASTERN CORNER OF THE SITE,3. THE SOUTH FORK OF SACK CREEK SOUTH IN THE NORTHWEST CORNER OF THE SITE FLOWS EAST, AND4. SHAY DITCH IS IN THE SOUTHWEST CORNER OF THE SITE AND THEN FLOWS EAST ALONG THE SOUTHERLY BOUNDARY.MUSTANG RUN, BIG DRY CREEK, AND SHAY DITCH HAVE REGULATED FLOODPLAINS WHICH ENCUMBER PORTIONS OF THEPROPERTY.

HISTORIC DRAINAGE PATTERNS HAVE BEEN DENOTED ON PLAN SHEETS 2 AND 3. AN EXISTING GROUND COVER CONSISTS OFMOSTLY NATIVE GRASSES, AND TREES ARE MAINLY PRESENT NEAR THE WATER WAYS. BASED ON THE EXISTING TOPOGRAPHYOF THE SITE, THE HISTORIC DRAINAGE PATTERNS ARE DISCUSSED BELOW GENERALLY FROM WEST TO EAST WITH REGULATEDFLOODPLAIN BASINS BEGINNING "HF" FOR HISTORIC FLOODPLAIN AND OFF-SITE RIGHT-OF-WAY (ROW) BEGINNING WITH "O."BASIN HA, 7.75 ACRES, DRAINS NORTHERLY TO THE SOUTH FORK OF SACK CREEK SOUTH IN THE NORTHWEST CORNER OF THESITE. BASIN HB, 36.41 ACRES, IN THE NORTHEAST CORNER OF THE SITE DRAINS EASTERLY. BASIN HC, 32.10 ACRES, DRAINSSOUTHERLY INTO MUSTANG RUN. BASIN HD, 23.61 ACRES, DRAINS SOUTHEASTERLY. BASIN HE, 17.24 ACRES, DRAINSNORTHEASTERLY INTO MUSTANG RUN. BASIN HF1 CONTAINS 8.44 ACRES OF REGULATED FLOODPLAIN WITHIN MUSTANGRUN WHICH CONVEYS DRAINAGE EASTERLY TO BIG DRY CREEK. BASIN HF2 CONTAINS 4.68 ACRES OF REGULATEDFLOODPLAIN WITHIN MUSTANG RUN, SOME OF WHICH IS BACKWATER FROM BIG DRY CREEK. BASIN HF3 CONTAINS 26.20ACRES OF REGULATED FLOODPLAIN WITHIN BIG DRY CREEK WHICH CONVEYS FLOOD FLOWS FROM THE SOUTHEAST CORNEROF THE SITE IN A NORTHERLY DIRECTION. BASIN HG, 7.44 ACRES, DRAINS SOUTHEASTERLY INTO THE CONFLUENCE OFMUSTANG RUN AND BIG DRY CREEK. BASIN HH, 12.64 ACRES, DRAINS NORTHEASTERLY INTO MUSTANG RUN. BASIN HI, 60.11ACRES; BASIN HJ, 57.94 ACRES; BASIN HK, 16.46 ACRES; AND HL, 38.73 ACRES, DRAIN EASTERLY INTO BIG DRY CREEK. BASIN HM,6.37 ACRES, DRAINS TO SHAY DITCH PART OF WHICH IS IN THE SOUTHWEST CORNER OF THE SITE CONTAINING REGULATEDFLOODPLAIN. BASIN HO1 CONTAINS 5.68 ACRES OF ROW FOR EAST 152ND PARKWAY. BASINS HO2 AND HO3 INCLUDEWASHINGTON STREET ROW FOR A TOTAL OF 5.56 ACRES AND 3.19 ACRES, RESPECTIVELY. DISCUSSIONS OF THE CITY'S EAST152ND PARKWAY REALIGNMENT CONTINUE.

THE PROPOSED DEVELOPMENT PLAN ILLUSTRATED HEREIN PROPOSES A MULTITUDE OF USES. THE NORTHERN PORTION OFTHE SITE (NORTH OF EAST 152ND PARKWAY) IS PROPOSED AS LOGISTICS WITHIN PLANNING AREAS A AND B. COMMERCIAL ISPROPOSED WITHIN PLANNING AREAS C AND J. MULTI-FAMILY IS PROPOSED WITHIN PLANNING AREAS D AND M. PLANNINGAREAS E AND K ARE PROPOSED AS SINGLE-FAMILY ATTACHED (SFA) / MULTIFAMILY. PLANNING AREAS F, G, AND O AREPROPOSED AS RESIDENTIAL SMALL-LOT SINGLE-FAMILY DETACHED AND ATTACHED HOUSING (SFD-SM / SFA). PLANNINGAREAS H AND L ARE PROPOSED AS SINGLE-FAMILY DETACHED RESIDENTIAL HOUSING (SFD) / SFD-SM / SFA. PLANNING AREA IIS PROPOSED AS MAIN STREET COMMERCIAL. PLANNING AREA N IS PROPOSED AS SFD-SM / SFA / MULTIFAMILY. PLANNINGAREA P IS PROPOSED AS SFD-SM / SFA / SCHOOL. PARKS AND OPENS SPACE (POS) IS PROPOSED IN PLANNING AREAS 1-4 ANDPARCEL A. REGULATED FLOODPLAIN WILL REMAIN AS OPEN SPACE.

IN THE POST DEVELOPED CONDITION, WATER QUALITY PONDS (TO INCLUDE FULL-SPECTRUM DETENTION FOR THOSE NOTDIRECTLY DISCHARGING TO AN EXISTING CREEK) WILL BE STRATEGICALLY PLACED THROUGHOUT THE DEVELOPMENT TOCAPTURE RUNOFF, ATTENUATE EXCESS URBAN RUNOFF VOLUME (EURV), AND PROVIDE WATER QUALITY IN ACCORDANCEWITH URBAN DRAINAGE AND FLOOD CONTROL DISTRICT (UDFCD) AND STATE OF COLORADO REQUIREMENTS. SERIALEURV/WATER QUALITY FACILITIES WILL BE UTILIZED WHERE POSSIBLE TO LIMIT DISTURBANCE TO THE REGULATEDFLOODPLAIN. PER UDFCD GUIDELINES, EACH POND MUST BE SIZED FOR THE FULL WATERSHED AREA TRIBUTARY TO THATPOND. EACH POND IN SERIES THEREFORE RECEIVES NO BENEFIT FROM RELEASING INTO THE SUCCESSIVE POND AND INSTEADWILL CONFLUENCE WITH THE STORM SEWER SYSTEM OF THE SUCCESSIVE POND WHERE POSSIBLE. PROPOSED DRAINAGEBASINS, WATER QUALITY POND LOCATIONS AND RUNOFF CALCULATIONS HAVE BEEN PROVIDED ON PLAN SHEETS 4 AND 5.IN THE POST DEVELOPED CONDITION, BASIN A WILL REMAIN UNDISTURBED AND THEREFORE RUNOFF GENERATED WITHINTHE BASIN WILL NOT REQUIRE WATER QUALITY FACILITIES. BASINS B, D, O1 (E. 152ND PARKWAY AS REALIGNED), AND O3D(IMPROVED WASHINGTON STREET) WILL DRAIN TO POND III EURV/WATER QUALITY AND DETENTION FACILITY THEN MAYCONFLUENCE WITH STORM SEWER RECEIVING POND IV FLOWS. BASIN C, AND O3C (IMPROVED WASHINGTON STREET) WILLDRAIN TO POND II EURV/WATER QUALITY FACILITY AND RELEASE INTO MUSTANG RUN. BASIN E, AND O3E (IMPROVEDWASHINGTON STREET) WILL DRAIN TO POND I EURV/WATER QUALITY FACILITY AND RELEASE INTO MUSTANG RUN. BASIN GWILL DRAIN TO POND IV EURV/WATER QUALITY FACILITY AND RELEASE INTO THE CONFLUENCE OF BIG DRY CREEK ANDMUSTANG RUN. BASIN H WILL DIRECTLY DISCHARGE INTO MUSTANG RUN JUST UPSTREAM OF ITS CONFLUENCE WITH BIG DRYCREEK. BASIN I WILL DRAIN TO POND V EURV/WATER QUALITY FACILITY AND RELEASE INTO BIG DRY CREEK. BASINS J-L WILLDRAIN TO POND VI EURV/WATER QUALITY FACILITY AND MAY THEN CONFLUENCE WITH STORM SEWER RECEIVING POND VFLOWS. BASIN O2, CONSISTING OF WASHINGTON STREET IMPROVEMENTS, WILL CONNECT TO THE EXISTING STORM SEWERINFRASTRUCTURE FROM WASHINGTON STREET IMPROVEMENTS PHASE 1 - 144TH TO 146TH AVENUE AND ASSOCIATEDEXISTING NORTHERN DETENTION POND, INTO SHAY DITCH AFTER TREATMENT AND THEN ON TO BIG DRY CREEK.

REFERENCES FOR THIS DRAINAGE ANALYSIS INCLUDE THE FOLLOWING:1. BIG DRY CREEK MAJOR DRAINAGE WAY PLAN CONCEPTUAL DESIGN REPORT, PREPARED BY WRIGHT WATER ENGINEERS,

INC. AND DATED MARCH 2012;2. FLOOD HAZARD AREA DELINEATION, BIG DRY CREEK, PREPARED BY WRIGHT WATER ENGINEERS, INC. AND DATED

JANUARY 2012;3. OUTFALL SYSTEMS PLANNING (OSP) UPDATE OF BIG DRY CREEK NORTHERN TRIBUTARIES, CONCEPTUAL PRELIMINARY

DESIGN REPORT, PREPARED BY WRIGHT WATER ENGINEERS, INC. AND DATED MARCH 2007;3. OUTFALL SYSTEMS PLANNING UPDATE OF BIG DRY CREEK NORTHERN TRIBUTARIES, ALTERNATIVES EVALUATION REPORT,

PREPARED BY WRIGHT WATER ENGINEERS, INC. AND DATED MAY 2006;4. FEDERAL EMERGENCY MANAGEMENT AGENCY (FEMA) FIRM PANELS 08001C0301J AND 08001C0303J REVISED JANUARY

20, 2016;5. FEMA LOMR CASE NO. 16-08-0189P EFFECTIVE NOVEMBER 25, 2016;6. 25 NORTH, WASHINGTON STREET WIDENING IMPROVEMENTS, 147TH TO 150TH AVENUE, FINAL DRAINAGE REPORT, CITY

OF THORNTON, COLORADO, PREPARED BY CKE ENGINEERING INC. AND DATED JUNE 2019 (RELEASED FORCONSTRUCTION NOVEMBER 19, 2019); AND

7. SOIL SURVEY OF ADAMS COUNTY, COLORADO ISSUED OCTOBER 1974 BY THE UNITED STATES DEPARTMENT OFAGRICULTURE SOIL CONSERVATION SERVICE (NOW KNOWN AS NRCS).

THE 2007 OSP RECOMMENDATIONS FOR MUSTANG RUN CHANNEL IMPROVEMENTS ARE OUTDATED AND NO LONGER MEETTHE CURRENT UDFCD DESIGN APPROACH FOR HIGH-FUNCTIONING, LOW-MAINTENANCE STREAMS. COORDINATION WITHUDFCD AND THE CITY WILL AID WITH DESIGN APPROACH FOR ANY STREAM IMPROVEMENTS ASSOCIATED WITH THIS PROJECT,IN ORDER TO RECEIVE UDFCD MAINTENANCE ELIGIBILITY.

SOILS ON-SITE ARE HYDROLOGIC SOIL GROUP C ACCORDING TO THE NRCS SOIL SURVEY. THE MAJORITY OF SOILS ARE PLATNERLOAM (MAP UNIT SYMBOLS PlB AND PlC), FOLLOWED BY ULM LOAM (MAP UNIT SYMBOLS UlC AND UlD). ARVADA LOAM (AdB),AND LOAMY ALLUVIAL LAND, MODERATELY WET (Lw) ARE LOCATED WITHIN OR DIRECTLY ADJACENT TO THE REGULATEDFLOODPLAIN AREAS.

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12071 Tejon Street, Suite 470Westminster, CO 80234

303.421.4224www.innovativelandinc.com

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CITY OF THORNTON BENCHMARK 144-30 (NEAR AZTEC#73).THE NORTHWEST BOLT, MARKED BY A TRIAD OF PUNCHMARKS, ON THE BASE OF THE POWER TOWER (NO. G-31)IN THE SOUTHEAST QUADRANT OF 144TH AVENUE ANDWASHINGTON STREET.

NAVD 88 DATUM ELEVATION OF 5148.24.

Tim Semones

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City Creek, Zoning, PLZ201801577 3rd Submittal, DE Review, 3/5/2020 Comments by Tim Semones

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This highlighted text should be removed as it doesn't add anything to the discussion and introduces confusion regarding what is required. Please see the comment on Sheet 5 from the first submittal review of the Preliminary Drainage Plan. (Copy provided below) The discussion at the 6/29/2018 meeting was that the city was leaning towards only requiring WQCV & EURV for the ponds that have a direct discharge to the Big Dry Creek. Ponds I, II, & IV discharge to Mustang Run, not Big Dry Creek. Based on internal city discussions with the city Floodplain Administrator, due to the close proximity of these ponds to the Big Dry Creek confluence, the city will likely allow these three ponds to only need WQCV & EURV (final determination to be made at the time of development). There are caveats to this approach however. UDFCD needs to buy off on the "beat the peak" method for these ponds, the Mustang Run master plan improvements will need to be constructed before the ponds are constructed, and the invert out from the ponds will need to be at or above the 10-year water surface elevation in Mustang Run. This text is being provided as reference only as to why the noted text needs to be deleted. The Final Drainage Report(s) will need to include the specific details.

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Unless there are plans to prepare a Final Drainage Report (FDR) for the entire City Creek property, then this entire note needs to be revised. The city's current understanding is that no such FDR is planned. A Preliminary Drainage Plan such as this one could not be considered a "Master Drainage Plan".

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THE CITY AND

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EURV

A

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Ex. Fence

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Drainage Basin ID


Existing Minor Contour5280

E TRANS

E TRANS

E TRANS

E TRANS

E TRANS

HB

HD

HC

MUSTANG RUN

BIG DRY CREEKFLOODPLAIN

E.152ND PARKWAY

E-470

BULL CANAL

HG

HF1

HH

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30' S.S.E.REC.# C0554369

30' S.S.EBK 3891, PG539

20' U.E. (PIPELINE)BK 3511, PG144

EXISTING POND

EXISTING ROAD

SOUTH FORK OF SACK CREEK SOUTH

EXISTING 4 - 10'X6' CBC

EXISTING 100-YRFLOODPLAIN

EXISTING 24" RCP CULVERT


EXISTING 24" CMP CULVERT


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U.P.E. = UNITED POWERU.E. = UTILITY

G.O.E. = GRANT OFP.S.E. = PERPETUAL SLOPE

P.E. = PERPETUALS.S.E = SANITARY SEWER

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KEY MAPSCALE: 1" = 1500'

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EX. GAS WELLACCESS ROAD

HL

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E.15

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UNPLATTED

STARGATE CHARTER SCHOOLSUBDIVISION, AMENDMENT NO. 1

REC. NO. 2018000059936

P.S.E.R.N. 2012000093583

HO2

20' G.O.E.BK 3260, PG 426

(TO BE VACATED)

20' G.O.E.BK 3260, PG 426

(TO BE VACATED)

30' S.S.E.BK 5605, PG 932

30' S.S.E.REC.# C0554369

HO1

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Comment on the second submittal was not addressed. This area is currently tributary to the noted 24" culvert that drains under 152nd Parkway to the southeast, and should therefore be its own basin.

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AE TRANS

E TRANS

E TRANS

E TRANS

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EXISTING PONDD

HF1

PA-ALOGISTICS± 99 AC

PA-BLOGISTICS± 12 AC

PA-CCOMMERCIAL

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MULTI-FAMILY±11 AC

PA-GSFD-SM / SFA

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E.152ND PARKWAY

E.152ND PARKWAY

E-470

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EX. 100-YR FLOODPLAINFEMA FIRM 08001C0301J

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PARCEL APOS

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30' S.S.E.REC.# C0554369

30' S.S.EBK 3891, PG539

20' U.E. (PIPELINE)BK 3511, PG144

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*PONDS DISCHARGING TO MUSTANG RUN WILL NEED TOINCLUDE 100-YEAR DETENTION FOR ON-SITE BASINS, IFMUSTANG RUN DRAINAGEWAY IMPROVEMENTS AREN'TCOMPLETED BY THE TIME THAT THE POND IS EXPECTED TODISCHARGE ON-SITE DEVELOPED FLOWS TO MUSTANG RUN.

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P.S.E.R.N. 2012000093583

PA-DMULTI-FAMILY

± 12 AC

PA-FSFD-SM/ SFA

± 7 AC

PA-HSFD / SFD-SM

/ SFA± 22 AC

PA-2POS

± 3 AC

PA-3POS

± 5 AC

PA-KSFA /

MULTIFAMILY± 17 AC

PA-LSFD / SFD-SM

/ SFA± 22 AC

PA-MMULTIFAMILY

± 11 AC

PA-NSFD-SM / SFA /MULTIFAMILY

± 9 AC

PA-OSFD-SM / SFA

± 23 AC

PA-PSFD-SM/SFA / SCHOOL

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STARGATE CHARTERSCHOOL SUBDIVISION

AMENDMENT NO. 1REC. NO. 2018000059936

EX. 100-YR FLOODPLAINFEMA FIRM 08001C0303J

ZONE AE

EX. 100-YR FLOODPLAINFEMA LOMR CASE # 16-08-0189P

ZONE A

PA-IMAIN STREETCOMMERCIAL

± 6 AC

PA-4POS

± 34 ACPA-J

COMMERCIAL± 4 AC

20' G.O.E.BK 3260, PG 426

(TO BE VACATED)

20' G.O.E.BK 3260, PG 426

(TO BE VACATED)

30' S.S.E.BK 5605, PG 932

30' S.S.E.REC.# C0554369

M

I

J

O2

EXISTING42" STORM

SEWER

LEGEND

Ex. Major Contour

Ex. Minor Contour

Property Line

Easement Line


Flow Direction Arrow

Drainage Basin ID

5280


Ex. Water Line


Ex. Gas



Ex. Fence

Floodplain Line

Basin Boundary Line

A

1 inch = ft.

SCALE

0200 200

200

100

152n

dan

dW

ashi

ngto

n,LL

C

Clie

nt:

Addr

ess:

Con

tact

:

1246

01s

tSt.

East

lake

,Col

orad

o80

614

Clar

keCa

rlson

(303

)457

-296

6




Know what's below.

R

Sheet:

Proj

.Nam

e:

Loca

tion:

Plan

Set:

Shee

tN

ame:

Prep

ared

By:

Appr

oved

By:

Revi

sion

Type

:

Hor

iz.S

cale:

Vert

.Sca

le:

Rev.

Dat

e:

Dat

e:Sh

eet:

Job

No.

:

No.

Des

igne

dBy

:



1050

-04

City

Cree

k

City

ofTh

ornt

on,C

olor

ado

Prel

imin

ary

Dra

inag

ePl

an

Prop

osed

Dra

inag

ePl

an

5

5of

5Ja

nuar

y31

,202

01"

=20

0'N

/A

ACS

ACS

TRH


MATCH TO SHEET 4



*PONDS DISCHARGING TO MUSTANG RUN WILL NEED TOINCLUDE 100-YEAR DETENTION FOR ON-SITE BASINS, IFMUSTANG RUN DRAINAGEWAY IMPROVEMENTS AREN'TCOMPLETED BY THE TIME THAT THE POND IS EXPECTED TODISCHARGE ON-SITE DEVELOPED FLOWS TO MUSTANG RUN.

Documents

CITY CREEK OVERALL DEVELOPMENT PLAN/CONCEPTUAL SITE PLAN · city creek overall development plan/conceptual site plan preliminary drainage plan part of the southwest 1/4 of section