DR DRAINAGEWAY THORNTON VALLEY SUBDIVISION OVERALL DEVELOPMENT PLAN & CONCEPTUAL SITE PLAN SWC OF COLO BLVD & THORNTON PKWY THORNTON, CO

Transcription

1 /CONCEPTUAL SITE PLAN TRACT A, THORNTON VALLEY FILING NO. 1 LOCATED IN THE NE 1/4 OF SEC. 24, T. 2 S., R. 68 W., OF THE 6TH P.M., CITY OF UNTY OF ADAMS, STATE OF COLORADO Planning. Architecture. Engineering S. Willow Drive, Suite 32 Greenwood Village, CO O C 21. Galloway & Company, Inc. All Rights Reserved SHEET LIST CIVIL ENGINEER / APPLICANT SITE GALLOWAY & COMPANY 6162 WILLOW DRIVE, SUITE 32 GREENWOOD VILLAGE, CO 8111 SCOTT BROWN, PE BUS: (33) FAX: (33) SHEET NO. DR 1 DR 2 DR 3 DR 4 DR TITLE COVER SHEET HISTORIC DRAINAGE PATTERN HISTORIC DRAINAGE PATTERN PROPOSED DRAINAGE PATTERN PROPOSED DRAINAGE PATTERN ARCHITECT GALLOWAY & COMPANY 6162 WILLOW DRIVE, SUITE 32 GREENWOOD VILLAGE, CO 8111 KRISTOFFER KENTON BUS: (33) FAX: (33) SURVEYOR ENGINEERING SERVICE COMPANY 13 SOUTH POTOMAC, SUITE 126 AURORA, CO 812 CHIP BECKSTROM, PLS BUS: (33) FAX: (33) DRAINAGEWAY BASIS OF BEARING BEARINGS SHOWN HEREON ARE BASED ON THE EAST LINE OF THE NE 1/4 OF SECTION 24, TOWNSHIP 2 SOUTH, RANGE 68 WEST OF THE 6TH PRINCIPAL MERIDIAN BEARING S 24'3"E AS REFERENCED ON THE PLAT OF THORNTON VALLEY FILING NO.1, AND BOUNDED BY THE MONUMENTS SHOWN HEREON. BENCHMARK TRACT A, THORNTON VALLEY FILING NO. 1, COUNTY OF ADAMS, STATE OF COLORADO. PARCEL CONTAINS (263,442 SQUARE FEET) 6.8 ACRES, MORE OR LESS. NORTH LEGAL DESCRIPTION: 2. VICINITY MAP NOT TO SCALE STORM DRAINAGE SHALL NOT ENTER ANY EXISTING IRRIGATION CHANNELS. THE DEVELOPER WILL BE RESPONSIBLE FOR BYPASSING THESE FACILITIES AS REQUIRED BY THE CITY AND THE APPROPRIATE DITCH COMPANY. ALL OFF-SITE EASEMENTS REQUIRED TO CONVEY DEVELOPED DRAINAGE TO AN ACCEPTABLE OUTFALL LOCATION, AS DETERMINED BY THE CITY, SHALL BE ACQUIRED AND RECORDED BY THE DEVELOPER PRIOR TO APPROVAL OF THE SUBDIVISION PLAT. THE RECEPTION NUMBER(S) FOR THESE EASEMENTS SHALL BE SHOWN ON THE PLAT. INFRASTRUCTURE SHALL BE PROVIDED TO ALLOW ALL UPSTREAM PARCELS WHO HISTORICALLY CONVEY DRAINAGE THROUGH THE DEVELOPMENT. SEEPAGE ANALYSIS AND STRUCTURAL BANK INTEGRITY ANALYSIS FOR EACH EXISTING (IF IT IS UPSTREAM) AND EACH DRAINAGEWAY WITHIN THE DEVELOPMENT SHALL BE SUBMITTED TO THE CITY WITH THE FIRST SUBDIVISION PLAT FOR THE PROPERTY. A NOTE SHALL BE ADDED TO INDICATE HOW NUISANCE FLOWS WILL BE HANDLED THROUGH PARCELS DOWNSTREAM OF THE DEVELOPMENT AND IF ANY EASEMENTS ARE ANTICIPATED TO BE ACQUIRED BY THE DEVELOPER. THIS MAY INCLUDE LETTERS OF ACKNOWLEDGMENT FROM THE DOWNSTREAM PROPERTY OWNER(S) BETWEEN THE PROPOSED DEVELOPMENT AND AN APPROVED DRAINAGEWAY. THE IMPROVEMENTS SHALL CONFORM TO THE CURRENT DRAINAGE MASTER PLAN AT THE TIME OF DEVELOPMENT. IF THERE IS NOT A MASTER PLAN AT THE TIME OF DEVELOPMENT, THE DEVELOPER WILL BE REQUIRED TO PREPARE A BASIN STUDY TO DETERMINE THE IMPACTS AND IDENTIFY MITIGATION MEASURE FOR THE PROPOSED PROJECT. APPROVAL IS REQUIRED FROM URBAN DRAINAGE AND FLOOD CONTROL DISTRICT (UDFCD) FOR THESE IMPROVEMENTS. STORM WATER QUALITY AND DETENTION ARE REQUIRED FOR ALL PORTIONS OF THE DEVELOPMENT INCLUDING THE ULTIMATE ROADWAY CONSTRUCTION. CLOMR'S/LOMR'S WILL BE REQUIRED WITH THIS DEVELOPMENT FOR ANY ADJUSTMENTS TO THE FLOODPLAIN. ALL WETLANDS AND BODIES OF WATER SHALL BE IDENTIFIED ON THE DRAINAGE PLAN. NO LOTS SHALL BE WITHIN A FOOT RADIUS OF A DELINEATED WETLANDS AND 7 FOOT RADIUS OF ANY BODY OF WATER. DETENTION PONDS SHALL BE COMBINED WHEREVER POSSIBLE AND SHALL BE SIZED USING CUHP OR AN EQUIVALENT INFLOW HYDROGRAPH METHOD. ACCESS SHALL BE PROVIDED TO ALL DRAINAGEWAYS AND DETENTION PONDS FOR MAINTENANCE. DRAINAGE PLAN GENERAL NOTES: 1. BENCHMARK: ADAMS COUNTY BM 28-3" DIAMETER ALUMINUM CAP SURVEY MARK ED " S68W S13" SET IN THE TOP OF A /8" FINNED ALUMINUM ROD ENCASED IN A 6" PVC PIPE WITH A LOGO CAP AT THE NORTHWEST CORNER OF COLORADO BOULEVARD AND EAST 1TH AVENUE. 1' NORTH OF THE CENTERLINE OF 1TH AVENUE AND 134' WEST OF THE CENTERLINE OF COLORADO BOULEVARD. ELEVATION=22.8 (NAVD 1988 DATUM) UFG2.1 KRL 2/2/18 DRAINAGE COVER DR-1

2 6162 S. Willow Drive, Suite 32 Greenwood Village, CO O C 21. Galloway & Company, Inc. All Rights Reserved RAILROAD THORNTON PARKWAY H MATCHLINE SEE BELOW MATCHLINE SEE ABOVE H.79 THORNTON PARKWAY 1.4 H6.8 6' SEC-ROW 4 1-YEAR RUNOFF COEFFICIENT 1-YEAR RUNOFF COEFFICIENT 6 44 WELBY ROAD 8 3 8' ROW H H H COLORADO AGRICULTURAL DITCH H ' SEC-ROW 43 3 COLORADO BOULEVARD H UFG2.1 2/2/ H HISTORIC DRAINAGE PLAN 29 DR-2

3 6162 S. Willow Drive, Suite 32 Greenwood Village, CO O C 21. Galloway & Company, Inc. All Rights Reserved MATCHLINE SEE DR H YEAR RUNOFF COEFFICIENT 1-YEAR RUNOFF COEFFICIENT UFG2.1 2/2/18 HISTORIC DRAINAGE PLAN DR-3

4 MATCHLINE SEE BELOW RO AD RA IL THORNTON PKWY S. Willow Drive, Suite 32 Greenwood Village, CO O C 1 2 THORNTON PKWY. 6 OS Galloway & Company, Inc. All Rights Reserved SCALE: 1"=' PROPOSED MAJOR CONTOUR PROPOSED MINOR CONTOUR A A OS NOTE: GRADES SHOWN ARE FOR INFORMATIONAL PURPOSES ONLY AND MAY BE ADJUSTED DURING THE CONSTRUCTION DOCUMENT REVIEW. 3 A A A OS-1 A OS EAST 9TH AVENUE OS PROPOSED 8' X ' 3.79 A-6 4 A COLORADO BLVD A-3 1-YEAR RUNOFF COEFFICIENT A PROPOSED 8' X ' 1-YEAR RUNOFF COEFFICIENT 43 1 A-11 WELBY RD. MATCHLINE SEE ABOVE OS-1 Planning. Architecture. Engineering. PROPOSED 8' X ' B UFG2.1 2/2/18 PROPOSED DRAINAGE MAP MATCHLINE SEE SHEET DR- DR-4

5 6162 S. Willow Drive, Suite 32 Greenwood Village, CO O C 21. Galloway & Company, Inc. All Rights Reserved 1 2 SCALE: 1"=' MATCHLINE SEE SHEET DR-4 8 PROPOSED MAJOR CONTOUR PROPOSED MINOR CONTOUR PROPOSED DRAINAGE EASEMENT YEAR RUNOFF COEFFICIENT 1-YEAR RUNOFF COEFFICIENT 3 3 NOTE: GRADES SHOWN ARE FOR INFORMATIONAL PURPOSES ONLY AND MAY BE ADJUSTED DURING THE CONSTRUCTION DOCUMENT REVIEW B POND VOLUME TABLE TRIBUTARY AREA REQUIRED VOLUME PROVIDED VOLUME 19.9 ACRES 2.89 AC-FT 3.7 AC-FT 21 2 COLORADO BLVD. UFG2.1 2/2/18 PROPOSED DRAINAGE MAP DR-