Tamarack Ranch SWA - Recharge Pond and Pipelines Phase II - Bid Package (3 of 5).pdf

PDF 969 KB Posted Apr 6, 2017

Attached to: PMAA, 5503, Tamarack Ranch SWA Recharge Pond & Pipelines II
Solicitation number: IFB1 PMAA 2017000212 3
Issued by: Larimer County, Denver City, Colorado

About this file

Written by GovTribe AI · Mar 13, 2026

This is a bid package and technical specification document for the Tamarack Ranch Stormwater Acceptance (SWA) Phase II project, involving recharge basin and pipeline construction. The project encompasses the design and construction of Recharge Basin 4 and associated pipeline infrastructure, including 24-inch and 15-inch diameter PVC pipelines with multiple junction connections, butterfly valves, air release valves, and meter pits. The scope includes construction of a recharge basin with a proposed berm top elevation of 3,748.0 feet, a maximum berm height of 4 feet, and a surface area of 27.1 acres at the top of the berm. Additional work involves pipeline connections from existing Wells 7 and 8 (replacing connections historically from Wells 14, 15, and 16), trench installation with native soil compaction to minimum 85 percent Proctor density, thrust block construction, and pond outlet splash pad facilities. The project crosses Interstate 76 near Crook, Colorado, and includes requirements for surface monitoring point arrays with twice-daily survey readings during active trenchless construction, threshold shutdown values of 1 inch vertical differential movement, and restoration of CDOT shoulders upon project completion.

The document provides comprehensive technical specifications and construction details for pipeline installation, including minimum bearing surface areas for thrust blocks, pipe trench details with 6-inch topsoil stripping and replacement, and detailed construction notes based on 34 PSI internal pipe pressure and 3,000 PSF soil bearing capacity. Specifications address soil identification characteristics for both clayey and granular soils, valve box installations with adjustable components, and perforated pipe outlet configurations. The project requires contractor field verification of existing pipeline conditions and mandates contact with the engineer if existing conditions vary from the plans. All work must comply with CDOT requirements for work within the state right-of-way, including contractor-managed site safety decisions regarding survey readings on interstate shoulders. The technical specifications indicate this is Phase II of a multi-phase project, with the drawing package dated December 16, 2016, and revised January 16, 2017.

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Other files

File	Type	Posted
SC622PerfBond.doc	DOC document	Apr 6, 2017
W-9 Blank 03-30-2016.pdf	PDF	Apr 6, 2017
Tamarack Ranch SWA - Recharge Pond and Pipelines Phase II - Bid Package (1 of 5).pdf	PDF	Apr 6, 2017
Tamarack Ranch SWA - Recharge Pond and Pipelines Phase II - Bid Package (2 of 5).pdf	PDF	Apr 6, 2017
2007revGRCcopy.pdf	PDF	Apr 6, 2017
Tamarack Ranch SWA - Recharge Pond and Pipelines Phase II - Bid Package (5 of 5).pdf	PDF	Apr 6, 2017
2017_03-30_Pre-bid sign in_Tamarack Ranch SWA Recharge Ponds and Pipelines.pdf	PDF	Apr 6, 2017
Capital Construction Contract (non-Federal) TEMPLATE.doc	DOC document	Apr 6, 2017
SC6221LMBond.doc	DOC document	Apr 6, 2017
SBP614BidBond.doc	DOC document	Apr 6, 2017
Tamarack Ranch SWA - Recharge Pond and Pipelines Phase II - Bid Package (4 of 5).pdf	PDF	Apr 6, 2017
2017_04-06_Questions and Answers.pdf	PDF	Apr 6, 2017

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PROPOSED RECHARGE BASIN 4

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INTERSTATE 76 (WESTBOUND)

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INTERSTATE 76 (EASTBOUND)

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EXISTING CULVERT

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PROPOSED PIPELINE

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PROPOSED BERMS TOP ELEV=3748.0 FILL 79 CY

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EXISTING HIGH POWER OVERHEAD ELECTRIC

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BORROW AREA FOR BERMS. (FLATTEN KNOLLS)

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SCALE IN

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FEET

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DATE

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DESIGNER:

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DRAFTER:

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CHECKED BY:

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APPROVED:

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APPROVED:

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CHIEF ENGR.:

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REVISIONS:

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DATE

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PROJECT NO.

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SHEET NO.

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TAMARACK RANCH SWA

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PHASE II

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RECHARGE BASIN 4 AND PIPELINE

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HANS NIELSEN

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HANS NIELSEN

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C16NE6C

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RECHARGE BASIN 4

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OF 8

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RECHARGE BASIN 4 SUMMARY

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POND LOW POINT ELEVATION

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PROPOSED BERM TOP ELEVATION

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MAX. BERM HEIGHT

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4 FT

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AREA AT TOP OF BERM ELEVATION

27.1 AC±

2" TO 4"

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GRADE

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VALVE LID

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BUTTERFLY VALVE DETAIL

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NOT TO SCALE

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VARIABLE

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EXTENSION TYPE 2'-20'

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CAST IRON VALVE BOXES.

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VARIABLE

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WATER

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SECTION VIEW-VALVE BOX

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NOT TO SCALE

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NOTE: LIDS ARE TO BE MARKED FOR WATER.

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ADJUSTABLE VALVE BOX

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BUTTERFLY VALVE W/ ADAPTER FLANGES

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AIR RELEASE VALVE

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AND METER PIT DETAIL

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PIPELINE RISER

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SINGLE BODY COMBINATION AIR VALVE (2"-MODEL 145C, AS SPECIFIED)

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PIPELINE

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6' DIAMETER METER PIT AND LID WITH HANDLES

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CLASS 6 ABC (8" MIN)

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CUT OUT OF PIT FOR PIPELINE AS REQUIRED

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OUTLET

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SHUT OFF VALVE

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HISTORICALLY FROM WELL 14, 15, & 16. PROPOSED TO BE FROM WELLS 7 & 8

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TO RECHARGE BASIN 4

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TO RECHARGE BASIN 3

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AutoCAD SHX Text INSTALL 24"x24"x24" WYE IN EXISTING PIPELINE

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INSTALL 24" BUTTERFLY VALVE IN EXISTING PIPELINE

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INSTALL 24" BUTTERFLY VALVE IN NEW PIPELINE

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JUNCTION AT STA: 0+50.00

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NOT TO SCALE

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TO RECHARGE BASINS 3 & 4

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FROM WELLS 14, 15, & 16

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AutoCAD SHX Text INSTALL 24"x24"x15" WYE IN EXISTING PIPELINE

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INSTALL 24" BUTTERFLY VALVE IN EXISTING PIPELINE

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AutoCAD SHX Text INSTALL 15"x15"x15" WYE IN EXISTING PIPELINE

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INSTALL 15" BUTTERFLY VALVE IN EXISTING PIPELINE

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INSTALL 15" BUTTERFLY VALVE IN NEW PIPELINE

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FROM WELLS 7 & 8

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CONNECTION DETAIL TO

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EXISTING LINE AT WELLS 7 & 8

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NOT TO SCALE

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AutoCAD SHX Text NOTE: CONTRACTOR TO FIELD VERIFY CONTRACTOR TO FIELD VERIFY EXISTING PIPELINES AND CONTACT ENGINEER IF EXISTING CONDITIONS VARY FROM PLANS.

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TYPICAL EMBANKMENT SECTION

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NOT TO SCALE

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EXISTING GROUND

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STRIP AND STOCKPILE 6" OF TOPSOIL. PLACE ON TOP OF NEW BERMS.

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STRIP AND STOCKPILE 6" OF TOPSOIL. PLACE ON TOP OF NEW BERMS.

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DATE

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DESIGNER:

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DRAFTER:

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CHECKED BY:

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APPROVED:

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APPROVED:

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CHIEF ENGR.:

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REVISIONS:

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DATE

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PROJECT NO.

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SHEET NO.

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TAMARACK RANCH SWA

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PHASE II

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RECHARGE BASIN 4 AND PIPELINE

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HANS NIELSEN

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HANS NIELSEN

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C16NE6C

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DETAILS - JUNCTIONS

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OF 8

PLAN VIEW

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POND OUTLET SPLASH PAD

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NOT TO SCALE

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SECTION VIEW

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POND OUTLET SPLASH PAD

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NOT TO SCALE

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END CAP

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PERFORATED PVC PIPE

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34" PVCW/THREADED PLUG FOR FLUSHING

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PERFORATED PVC PIPE

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END CAP

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#5 REBAR @ 12" O.C. EACH WAY (3" CLEARANCE)

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#5 REBAR @ 12" O.C. EACH WAY (3" CLEARANCE)

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SECTION VIEW

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POND OUTLET SPLASH PAD

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NOT TO SCALE

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PERFORATED PIPE

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DETAILS AT OUTLET

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PERFORATED PVC PIPE

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PERFORATED PVC PIPE

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SECTION

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ELEVATION

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TEE POST

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6" MJ X MJ

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6" GATE VALVE

AutoCAD SHX Text 24" x 6" TEE

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6" 90° FITTING

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24" X 6" TEE

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TEE POST (TYP)

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24" PVC PIPE

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CROSS-SECTION

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PLAN

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DUMP LINE

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CONNECTION DETAIL

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NOT TO SCALE

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6" GATE VALVE

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FOUNDATION

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NATIVE MATERIAL

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1'-0" (MAX.)

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6"(MIN.)

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DIA.

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PIPE

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PIPE

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EXISTING

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GRADE

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WIDTH VARIES

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EXCAVATED TRENCH

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VARIES

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COMPACTED FINAL BACKFILL NATIVE SOIL TO MIN OF 85% PROCTOR

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4' MIN

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PIPE TRENCH DETAIL

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NOT TO SCALE

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STRIP, STOCKPILE, AND REPLACE 6" OF TOPSOIL

AutoCAD SHX Text NOTE: CLASS I OR II SOILS SHALL BE USED FOR HAUNCHING AND 6 INCHES OF BEDDING IN AREAS OF HIGH GROUND WATER OR AS REQUIRED BY ENGINEER

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DATE

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DESIGNER:

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DRAFTER:

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APPROVED:

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APPROVED:

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CHIEF ENGR.:

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REVISIONS:

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DATE

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PROJECT NO.

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SHEET NO.

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TAMARACK RANCH SWA

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PHASE II

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RECHARGE BASIN 4 AND PIPELINE

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HANS NIELSEN

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HANS NIELSEN

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C16NE6C

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DETAILS - TRENCH & OUTLET

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BOND BREAKER

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REDUCER

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#4 STEEL BARS REINFORCEMENT BENT 90° AT ENDS.(3" MIN. BEND)

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DIRECTION CHANGE, TEE AS ELBOW

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DIRECTION CHANGE, CROSS

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TYPICAL TEE

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TYPICAL ALL BENDS

AutoCAD SHX Text CONSTRUCTION NOTES: 1. BEARING SURFACES SHOWN IN CHART ARE MIN. BEARING SURFACES SHOWN IN CHART ARE MIN. 2. BASED ON 34 PSI INTERNAL PIPE PRESSURE BASED ON 34 PSI INTERNAL PIPE PRESSURE 3. BASED ON 3,000 PSF SOIL BEARING CAPACITYBASED ON 3,000 PSF SOIL BEARING CAPACITY

AutoCAD SHX Text CRITERIA: 1. THRUST BLOCK IS CONSIDERED TO ACT AS A SPREAD FOOTING. THRUST BLOCK IS CONSIDERED TO ACT AS A SPREAD FOOTING. THEREFORE, HEIGHT OF BLOCK MUST BE EQUAL TO OR LESS THAN 12 THE DEPTH FROM THE GROUND SURFACE TO THE BLOCKS BASE. 2. THRUST BLOCK BEARING FACE IS APPROXIMATELY SQUARE. THRUST BLOCK BEARING FACE IS APPROXIMATELY SQUARE. 3. GROUND WATER LEVEL ASSUMED TO BE ABOVE THE THRUST BLOCK. GROUND WATER LEVEL ASSUMED TO BE ABOVE THE THRUST BLOCK. 4. ALLOWABLE BEARING PRESSURE: ALLOWABLE BEARING PRESSURE: CLAYEY SOIL- COMPUTED FROM SHEAR STRENGTH OF SOIL. GRANULAR SOIL- COMPUTED ON MAXIMUM ELASTIC COMPRESSION OF SOIL EQUAL TO INCH.12 INCH.

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BEARING SURFACE

AutoCAD SHX Text SOIL IDENTIFICATION CHARACTERISTICS: 1. CLAYEY SOIL: CLAYEY SOIL: VERY SOFT - EXTRUDES BETWEEN FINGERS WHEN SQUEEZED SOFT - MOLDED BY LIGHT FINGER PRESSURE MEDIUM - MOLDED BY STRONG FINGER PRESSURE STIFF - INDENTED BY THUMB VERY STIFF - INDENTED BY THUMB NAIL HARD - DIFFICULT TO INDENT BY THUMB NAIL 2. GRANULAR SOIL: GRANULAR SOIL: VERY LOOSE - EASILY PUSH ROD IN SEVERAL FEET LOOSE - EASILY EXCAVATED WITH SHOVEL MEDIUM - DIFFICULT TO EXCAVATE WITH SHOVEL DENSE - PICK REQUIRED TO EXCAVATE

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TYPICAL CROSS SECTION

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BOND BREAKER

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23 O.D. PIPE

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BEARING SURFACE

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DIRECTION CHANGE, ELBOW

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DIRECTION CHANGE VERTICAL, ANCHOR

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CHANGE IN LINE SIZE, REDUCER THR0UGH LINE CONNECTION, CROSS

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DIRECTION CHANGE

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THROUGH LINE CONNECTION, TEE

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THROUGH LINE CONNECTION, WYE

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VALVE ANCHOR

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DEAD END, PLUG

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BOND BREAKER

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BEARING SURFACE (UNDISTURBED SOIL)

AutoCAD SHX Text 12"%%C

AutoCAD SHX Text 18"%%C

AutoCAD SHX Text 24"%%C

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AutoCAD SHX Text 11.25%%D

AutoCAD SHX Text 22.5%%D

AutoCAD SHX Text 45%%D

AutoCAD SHX Text 90%%D

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TEE OR

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END

AutoCAD SHX Text B E N D S

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MINIMUM BEARING SURFACE AREA (IN SQUARE FEET)

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PIPE SIZE

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DATE

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DESIGNER:

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DRAFTER:

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CHECKED BY:

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APPROVED:

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APPROVED:

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CHIEF ENGR.:

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REVISIONS:

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DATE

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PROJECT NO.

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SHEET NO.

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TAMARACK RANCH SWA

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PHASE II

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RECHARGE BASIN 4 AND PIPELINE

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HANS NIELSEN

AutoCAD SHX Text 12/16

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HANS NIELSEN

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C16NE6C

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DETAILS - THURST BLOCKS

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20+00 21+00 22+00 23+00 24+00 25+00

CROSSING EXTENTS

INTERSTATE 76

MP-2MP-1

MONITORING POINT ARRAY

EXISTING

CULVERT

MONITORING POINT

ARRAY

NOTES:

1. SITE SAFETY INCLUDING SURVEY READINGS CONDUCTED ON THE

INTERSTATE SHOULDER SHALL BE AT THE DISCRETION OF THE

CONTRACTOR.

2. EACH MONITORING ARRAY SHALL CONSIST OF FIVE EVENLY SPACED

SURFACE SURVEY POINTS, AS SHOWN IN DETAIL 1.

3. SURVEY POINTS SHALL BE SITUATED APPROX. 1 FT FROM THE EDGE

OF PAVEMENT TOWARD THE CENTER OF THE TRAVEL LANES; DRIVEN

INTO THE PAVEMENT SURFACE.

4. SURFACE MONITORING POINTS SHALL BE READ:

4.1. A MINIMUM OF TWICE DAILY AND A MAXIMUM OF 6 HOURS

BETWEEN READINGS DURING ACTIVE TRENCHLESS

CONSTRUCTION WITHIN CDOT RIGHT-OF-WAY.

4.2. DAILY SURVEY READING SHALL CONTINUE AFTER WORK WITHIN

CDOT RIGHT-OF-WAY IS COMPLETED UNTIL FLUCTUATIONS IN

SUCCESSIVE SURFACE DATA MEASUREMENTS ARE WITHIN 0.02

FT OF ONE ANOTHER FOR AT LEAST 3 CONSECUTIVE READINGS.

5. RESPONSE VALUES FOR COLLECTED SURVEY DATA ARE AS FOLLOWS:

5.1. THRESHOLD VALUE: 12 INCH OF VERTICAL DIFFERENTIAL

MOVEMENT AS COMPARED TO THE INITIAL BASELINE VALUE.

5.2. SHUTDOWN VALUE: 1 INCH OF VERTICAL DIFFERENTIAL

MOVEMENT AS COMPARED TO THE INITIAL BASELINE VALUE.

5.3. IF ANY RESPONSE VALUES ARE REACHED, THE CONTRACTOR

SHALL CONTACT THE ENGINEER OR CDOT AS INDICATED IN THE

PROJECT SPECIFICATIONS.

6. SURFACE SURVEY POINTS SHALL BE REMOVED AND THE CDOT

SHOULDER SHALL BE RESTORED TO ORIGINAL CONDITIONS AFTER

THE ENGINEER HAS DETERMINED THAT ADDITIONAL SURVEY DATA IS

NO LONGER REQUIRED.

7. APPROXIMATE LOCATION OF MONITORING POINT ARRAYS ARE AS

FOLLOWS:

INSTRUMENTATION SCHEDULE - MONITORING POINT ARRAY

STATION

(APPROX.) NOTES

MP-1 21+70 PLACE MONITORING POINTS THROUGH

PAVEMENT SURFACE PER DETAIL 2

MP-2 23+38 PLACE MONITORING POINTS THROUGH

PAVEMENT SURFACE PER DETAIL 2

LEGEND:

MONITORING POINT ARRAY

SURFACE SURVEY POINT

APPROXIMATE CPW RIGHT-OF-WAY

APPROXIMATE CDOT PAVEMENT BOUNDARY

APPROX.

2" Ø

SURVEY NAIL

PUNCH MARK

METAL IDENTIFICATION

MARKER

INT I D

SURFACE SURVEY POINT

SCALE: NTS

PAVEMENT

SURFACE

C PIPE

7'-6" 15'-0"

SURFACE SURVEY POINT GROUND SURFACE

MONITORING POINT ARRAY

SCALE: NTS

TUNNEL SPRINGLINE

CARRIER PIPE (30" Ø)

MONITORING POINT ARRAY LOCATION

SCALE: NTS

LIN

S, C

, S

0.3

.31

B Y

1/1 6/1

) R

LIG

LH LH RD

3/2 1/1

8 O F

, C

K, C

SCALE 1" = 50'

File details come from the government source that posted it. Updated Mar 11, 2026.