Cherry_Creek_Stilling_Basin_Specs_6-10-19_PART_2.pdf

Access Road & Pedestrian / Bike Path Crossing

Work Area - Cherry Creek Dam Stilling Basin

Approximate Onsite Disposal Area

Contractor Access Road (Aggregate Surface Road)

Contractor Private Vehicle Parking Area

Notes: 1. Directions to the construction site from Interstate 225:

Take southbound Parker Road Exit Take Vaughn Way / Dam Road Exit Travel straight through the intersection with the stop light onto the Cherry Creek Dam Road Turn right onto the Contractor Access Road (2-Wheeled Path) Follow Contractor Access Road to the Cherry Creek Dam Stilling Basin

2. Always Yield to Bicyclists and Pedestrians on the Bike Path.

CONTRACTOR SITE PLAN AND ACCESS PLAN

ATTACHMENT 1

CONTRACTOR WORK AREA, STAGING AREA AND ACCESS

ATTACHMENT 2

Contractor Access Road

Approximate On- Site Disposal Area

Cherry Creek Stilling Basin;

Dewater and Sediment/Debris Removal

Pedestrian / Bike Path Crossing

Access Road

Cherry Creek Channel

Staging Area

Cherry Creek Dam Stilling Basin Structure

Orange Construction Fence

ATTACHMENT 3

CHERRY CREEK STILLING BASIN PLAN (FROM 1953 AS-BUILT DRAWING CC 1-25-1)

CHERRY CREEK STILLING BASIN CENTERLINE PROFILE (FROM 1953 AS-BUILT DRAWING CC1-25-1)

PLAN OF THE CHERRY CREEK STILLING BASIN STRUCTURE (FROM 1953 AS-BUILT DRAWING CC1-50-1)

PROFILE OF THE CHERRY CREEK STILLING BASIN STRUCTURE (FROM 1953 AS-BUILT DRAWING CC1-50-1)

SECTION A-A FROM 1953 AS-BUILT DRAWING CC 1-50-2 SHOWING DRAINAGE DETAILS

(LOCATION OF SECTION SHOWN ON PLAN, AS-BUILT DRAWING CC1-50-1)

SECTIONS B-B, C-C FROM 1953 AS-BUILT DRAWING CC 1-50-2 SHOWING DRAINAGE DETAILS

(LOCATION OF SECTIONS SHOWN ON PLAN, AS-BUILT DRAWING CC1-50-1)

ATTACHMENT 4

ESTIMATED ORIGINAL TOPOGRAPHY OF THE CHERRY CREEK STILLING BASIN (1950)

ATTACHMENT 5

Oct 1948 photo of the Cherry Creek Stilling Basin and the Cherry Creek Channel, looking downstream, before water was released.

Oct 1948 photo of the Cherry Creek Channel immediately downstream of the Cherry Creek Stilling Basin Structure before water was released.

ATTACHMENT 6

Cherry Creek Dam Stilling Basin

Dewatering/Sediment Removal/Cleaning Photographs

November 2009

Stilling basin at beginning of November 2009 dewatering effort Sandbag dam placed just upstream of the Interstate 225 bridges

Close-up of sandbag dam in previous photo Large pump set-up used for initial dewatering effort

Large pump used for initial dewater Intake and discharge hoses for large pump

One of pump locations larger pump was moved to after initial dewater Pump locations used for smaller pumps after initial dewatering.

Fish removal operation Fish removal operation

Significant sediment removal operation D/S of end sill after initial dewatering. Disposal area for sediment removed from stilling basin Significant sediment removal is not anticipated for 2019 contract.

Track skid loader that was allowed in stilling basin, betw. baffles & end sill Skid loader removing sediment on floor of basin between baffles & end sill

Skid loader removing sediment on floor of basin between baffles & end sill Manual removal of sediment between, & upstream of, baffle blocks

Pressure washing of stilling basin Pressure washing of stilling basin

Wall drain outlets on inside of east wall of stilling basin Close-up of wall drain outlets on east wall of stilling basin

D/S end sill of basin at end of walls, looking east to west. Basin has no sump West basin wall & D/S end sill of basin, looking west. Basin has no sump

View of basin end sill looking downstream toward I-225 bridge

Close-up of west side of basin, looking D/S, after dewater & cleaning Close-up of middle of basin, looking D/S, after dewater & cleaning & prior to & prior to inspection Inspection

Close-up of east side of basin, looking D/S, after dewater & cleaning & prior to inspection

Close-up of west side of basin, looking U/S, after dewater & cleaning & Close-up of east side of basin, looking U/S, after dewater & cleaning & prior to prior to inspection inspection

One of several existing damaged baffles in stilling basin Another damaged baffle in stilling basin

Baffle that was in good condition