FLOOD02900

• County: Adams
• Community: Commerce City
• Basin: South Platte
• Title: Lower First Creek and Direct Flow Area 0055 Major Drainageway Planning
• Date: 5/1/2002
• Prepared For: UDFDC
• Prepared By: Turner Collie & Braden Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

N
o
N
~
o
;;

a
.
.
..
~
g
~
,
t
<
.
<
8
/
~
~
U
/
~
D
..
<
~
6
~
~
~
;:

I

I

COMMENTARY SHEET 3 OF 23

PRELIMINARY DESIGN COST ESTIMATE SHEET 3 OF 23

I

DRAlNAGEWAY; LOWER FIRST CREEK

STATIONS; 38+00 TO 66+00

ORAINAGEWAY; LOWER FIRST CREEK

100-YEAR FLOW RANGE; 4,443 CFS FROM 38+00 TO 57+50; 4,180 CFS FROM 57+50 TO 66+00

I

IMPROVEMENT

QUANTITY

UNIT

UNIT COST

TOTAL COST

PROPOSED CONDITIONS;

THE IMPROVEMENTS ARE DESIGNED FOR PEAK FLOOD Fl.OW RATES BASEO ON FUTURE DEVELOPMENT, A 100-YEAR
RECURRENCE PERIOD, AND MASTER PLANNED REGIONAL DETENTION IN THE UPPER WA TERSHED,

IMPROVEMENTS FROM STATION 38+00 TO 57+50 ON THIS SHEET WILL BE ADMINISTERED BY DI\o1SION OF MINERALS
AND GEOLOGY THROUGH AN EXISTING RECLAMATION PERMIT,

IMPROVEMENTS INCLUDE A GRASS-LINED CHANNEL FROM STATION 57+50 TO STATION 62+00.

IMPROVEMENTS FOR THIS SHEET WILL REQUIRE AT LEAST A 215 FOOT RIGHT-OF-WAY,

LOW Fl.OW CHANNEL IMPROVEMENTS SHALL INCLUOE RIPRAP ALONG THE SIDE SLOPES,

IMPROVEMENTS FOR THIS SHEET SHALL REQUIRE SEVEN 10'X6' RCBC 52 FEET IN LENGTH UNDERNEATH BRIGHTON
ROAD AT THE INTERSECTION OF FIRST CREEK.

NATIVE GRASSES SHALL BE PLANTED THROUGHOUT THE IMPROVED AREA TO PREVENT EROSION.

EARTHWORK (CUT) 1,567
EARTHWORK (FILL) 14,282
MULTIPURPOSE TRAIL (12' WIDE) 450
NATIVE SEEDING AND MULCHING 2,1
7 - lO'X6' CBC (BRIGHTON ROAD) 52
RIPRAP FOR LOW Fl.OW CHANNEL 42D
RIGHT-OF-WAY 99,330
OUTfALL RIPRAP 1

$6,00
$8,00
$25,00
$2,DOO.00
$4,900,00
$50,00
$1.00
$10,000,00

I

$9,402.00
$114,256,00
$11,250,00
$4,240,00
$254,800.00
$21,000.00
$99,330.00
$10,000.00

CY
CY
LF
ACRE
LF
CY
SF
LS

I

I

$524,278.00
$246,411,00

TOTAL ESTIMATED CONSTRUCTION COST
47:>,; LEGAL, ADMIN" ENGINEERING, UTILITY ADJUSTMENTS & CONTINGENCIES

I

$770,689,00

I

TOTAL ESTIMATED COST

IMPROVEMENTS INCLUDE 4S0 LINEAR FEET OF A 12 FOOT WIDE MULTIPURPOSE TRAIL

OUTfALL RIPRAP WLL BE NEEDED FOR THE BOX CULVERT AT BRIGHTON ROAD

I

PROBLEMS ENCOUNTfRFD ON THIS SHFFT'

POSSIBlE NEED FOR RELOCATING PRIVATE UTILITIES AND ROADS,

BRIGHTON ROAD MAY NEED TO BE ELEVATED NEAR THE INTERSECTION OF FIRST CREEK TO ACCOMMOOA TE THE
loo-YEAR EVENT Fl.OW,

AREAS REQUIRING FILL TO ACHIEVE THE DESIRED TOP-OF-BANK WILL ALSO REQUIRE GRADING OF THE ADJACENT
LAND,

MULTIPLE BUILDINGS MAY NEED TO BE RELOCATED OR CONDEMNED,

I

I

I

I

I

I

I

I

I