HomeMy WebLinkAboutAddenda - BID - 5940 FOSSIL CREEK TRAIL UNDERPASS & HWY 287Citv of Fort Collins
Administrative Services
Purchasing Division
CITY OF FORT COLLINS
ADDENDUM No. 1
BID #5940
FOSSIL CREEK TRAIL UNDERPASS @ HWY 287
SPECIFICATIONS AND CONTRACT DOCUMENTS
Bid No. 5940 — FOSSIL CREEK TRAIL UNDERPASS @ HWY 287
OPENING DATE: Monday, October 31, 2005 — 3:00 p.m. (Our Clock)
To all prospective bidders under the specification and contract documents described above, the following
changes are hereby made.
SPECIFICATIONS
1) All Division 2 specifications have been reprinted and are revised as attached. Printing errors of some
of the text characters within the original 'Specifications and Contract Documents' books require that the
Division be re-released.
2) Piles need to be driven to CDOT requirements for "virtual refusal" as detailed in Section 502.05 of the
CDOT Standard Specifications for Road and Bridge Construction - 2005. A copy of the Engineering
Geology sheet from the original culvert construction is attached for reference.
GENERAL
1) The Equipment Cover shall be bid as Bid Item #36 Architectural Miscellaneous. (Sheet 28 of 32)
2) Dewatering is covered under the CDOT specification for Structure Excavation 206.01. Dewatering is
considered an incidental cost to all bid items that directly require dewatering for completion.
3) A R.O.W. Use Permit from C.D.O.T. is not required for this project.
ATTACHMENTS
1) Division 2
• Section 2100 Mobilization
• Section 2200 Earthwork & Grading
• Section 2221 Trenching, Backfilling & Compaction
• Section 2300 Culverts
• Section 2520 Portland Cement Concrete Paving
• Section 2601 Manholes
• Section 2900 Site Revegetation
Total Page(s) 23
2) Engineering Geology sheet from the original culvert construction
Total Page(s)— 1 (11x17)
If you should have any questions, please contact John Stephen, CPPO, Senior Buyer at (970) 221-6777 or
Page 1 of 2
215 North Mason Street • 2nd Floor • P.O. Box 580 • Fort Collins, CO 80522-0580 • (970) 221-6775 • FAX (970) 221-6707
DIVISION 2
SECTION 02221— TRENCHING, BACKFILLING, AND COMPACTION
PART 1-GENERAL
1.01 Scope
Furnish all labor, materials, and equipment, and perform all operations to complete trenching, including
excavation, subgrade preparation, drainage, filter fabric installation, bedding, backfilling, compacting,
and finish grading for underground pipelines, service lines, sleeving, and appurtenances as shown on
the drawings and as specified herein.
1.02 Related Work
A. Section 02200 — Earthwork and Grading.
B. Section 02520 — Portland Cement Concrete Paving,
C. Section 02601 — Manholes.
D. Section 16000 — General Electrical.
1.03 Protection
A. Obtain utility locations before commencing work. Protect all existing underground utilities, above
ground structures or plantings, or repair to original condition.
PART 2 MATERIALS:
2.01 Trench Backfill Material
A. Trench excavation or imported material free from frozen material, stumps, roots, brush, other
organic matter, cinders or other corrosive material, debris, and rocks or stones greater than 2
inches in any dimension.
2.02 Other
A. Bedding, piping, filter fabric, and other materials specified on the drawings and in related sections.
PART 3 EXECUTION
3.01 Preparation
A. Remove and stockpile topsoil from areas to be disturbed by construction. Keep topsoil segregated
from non -organic trench excavation materials and debris.
3.02 Trenching
A. Excavate trenches by open cut methods. Segregate suitable backfill. Rough trench excavation will
leave trench with uniform width and vertical sidewalls from an elevation one foot above the top of
installed pipe to the bottom of pipe.
B. Minimum trench width will provide 6 inch space between pipe wall and side of trench. Maximum
trench width will be shown on the drawings or in the appropriate pipeline section. If not specified
elsewhere the maximum trench width is the pipe O.D. plus 20 inches.
City of Fort Collins Section 02221 — Trenching, Backfilling and Compacting
Park Planning & Development Division Page 1 of 2
C. Grade trench bottom to provide uniform clearance for bedding material. De -water trench.
Remove loose material and foreign objects. When required, install filter fabric per manufacturer's
specifications.
D. Unstable subgrade is not expected. If unstable subgrade material is encountered, report the
condition to the Owner. Remedy and payment for subgrade stabilization will be based on the
actual conditions encountered.
3.03 Bedding
A. Pipe will be bedded in accordance with the detailed drawings or the appropriate pipeline
specification.
3.04 Backfilling and Compaction
A. Backfill trench promptly after completion of pipe bedding.
B, Deposit material in uniform layers with thickness commensurate with the soil encountered and the
compaction equipment used.
C. Compaction requirements will be made at the moisture content and will meet the densities, by
zone, specified in Section 02200 — Earthwork and Grading.
D. Coordinate and schedule compaction tests with City Representative.
3.05 Surface Restoration
A. Restore pavements according to City of Fort Collins Standards.
B. Restore landscaped areas according to Section 02900 — Landscaping.
END OF SECTION
City of Fort Collins Section 02221 - Trenching, Backfilling and Compacting
Park Planning & Development Division Page 2 of 2
DIVISION 2
SECTION 02300 — CULVERTS
PART 1 -GENERAL
Scope of work
A. This work shall consist of furnishing and installing, or installing only, pipe appurtenances,
including all bedding and backfilling required to complete the work. The current issue of "Storm
Drainage Design Criteria and Construction Standards" City of Fort Collins is made a portion of
this specification by reference.
PART 2 - MATERIALS
2.01 Standards
A. Materials shall meet the requirements set forth in the "Storm Drainage Design Criteria and
Construction Standards" or AS SHOWN ON THE DRAWINGS.
2.02 Certification
A. Submit manufacturer's certification that products meet requirements of the referenced standards
and drawings.
2.03 Shop Drawings
A. Submit shop drawings on materials specified according to requirements of the Shop Drawing
section of the Contract Documents.
PART 3 - EXECUTION
3.01 Standards
A. Construction requirements shall be in accordance with the requirements set forth in the "Storm
Drainage Design Criteria and Construction Standards" document and AS SHOWN ON THE
DRAWNGS.
END OF SECTION
City of Fort Collins Section 02300 — Culverts
Parks Planning & Development Division Page 1 of 1
DIVISION 2
SECTION 02520 — PORTLAND CEMENT CONCRETE PAVING
PART 1-GENERAL
Scope
A. Furnish all labor, materials, supplies, equipment, transportation, and perform all operations in
connection with and reasonably incidental to complete installation of concrete paving as shown on
the drawings and as specified herein. Items of work specifically included are:
B. Subgrade preparation for trail
C. Form work.
D. Reinforcement.
E. Surface finish.
F. Construction, expansion and control joints.
G. Curing.
H. Concrete trail
I. Interior slabs -on -grade in restroom, etc.
Work Not Included
A. Items of work specifically excluded or covered under other sections:
B. Excavation and backfrll.
C. Earthwork and grading.
D. Cast -in -place structural concrete or precast concrete, such as foundations, drainage appurtenances,
and pad and building.
E. Joint sealers.
Related Work
A. Division 2 — Site Work
a. Section 02050 — Demolition.
b. Section 02200 — Earthwork/Grading.
c. Section 02221 — Trenching, Backfilling, and Compaction.
B. Not Used
C. Division 7 — Thermal and Moisture Protection:
1. Section 07900 — Joint Sealers.
References
A. ACI 301 — Specifications for Structural Concrete for Buildings.
B. ASTM C33 — Concrete Aggregate.
C. ASTM C 150 —Portland Cement.
City of Fort Collins SECTION 02520 — Portland Cement Concrete Paving
Park Planning & Development Division Page 1 of 10
D. ASTM C260 — Air Entraining Admixtures for Concrete.
E. ASTM C309 — Liquid Membrane — Forming Compounds for Curing Concrete.
F. ACI 304 — Recommended Practice for Measuring, Mixing, Transporting, and Placing Concrete.
G. ACI 305R — Hot Weather Concreting.
H. ACI 306R — Cold Weather Concreting.
1. ACI 308 — Standard Practice for Curing Concrete.
J. ACI 309 — Recommended Practice for Consolidation of Concrete.
K. ACI 318-89 — Building Code Requirements for Reinforced Concrete.
Regulatory Requirements:
A. Conform to applicable code of governing authority for paving work within public right-of-way.
Tests:
A. Submit proposed mix design to testing laboratory for review prior to commencement of work. For
standard premix concrete mixes, the supplier's quality control records may be substituted for job
mix testing.
B. Refer to Division 1, Section 01400 Quality Control and Testing.
C. Coordinate and schedule sampling testing during concrete placement with City Representative.
Submittals:
A. Submit product data under provisions of Section 01300 —Submittals.
B. Submit data on admixtures and curing compounds.
C. Submit a ten pound sample of aggregate for exposed aggregate finish.
D. Submit manufacturer's data on leave -in -place construction joint form
Test Panels:
A. Provide a 3' x 3' test panel for finish and tooling of joints for Owner approval. Provide one panel
for each pavement type specified. In casting the panels, use personnel and methods to be
employed on the work.
B. If sample disapproved, cast additional samples until approval is obtained. Maintain test panel on
site until finished work is accepted. Test panel will represent minimum workmanship standard.
C. Work completed prior to text panel approval shall be subject to removal and replacement at
Owner's request.
PART 2 MATERIALS
2.01 Concrete Materials:
A. General: Provide materials of same brand and source throughout the project unless otherwise
noted.
B. Portland Cement: ASTM C150, Type I or Type I/I1, gray color.
C. Aggregates: ASTM C33, normal weight. In addition, the combined aggregate shall comply with
the following gradation, shown in percent passing.
City of Fort Collins SECTION 02520 - Portland Cement Concrete Paving
Park Planning & Development Division Page 2 of 10
Sieve Size
'/-Inch Nominal Maximum Size
'/ Inch
90 —100
3/8 Inch
60 — 80
No. 4
40 — 60
No. 8
30 — 45
No. 16
20 — 35
No. 30
13 — 23
No. 50
5 — 15
No. 100
0-5
D. Coarse Aggregate for Exposed Aggregate Finish: 5/8-inch maximum size; rounded shape, ratio of
maximum to minimum dimensions not to exceed 2.5:1; color to be tan to brown, no more than 2%
white or black combined, no pink, no red, no green.
E. Water: Clean and not detrimental to concrete.
2.02 Form Materials:
A. Slab Edges: Two by lumber permitted for surfaces not exposed to view in the final work. Use
concrete -form grade hardboard, "plyform" grade plywood, or metal for forming surfaces exposed
to view. Forms shall be straight and sufficiently stiff and well braced to meet line tolerances
specified in Part 3.
B. Keyed Joint Form: Wooden key or leave -in -place metal construction joint form.
C. Form Coatings: Commercial form -coating compounds that will not bond with, stain, or adversely
affect concrete surfaces, and will not impair subsequent treatments of concrete surfaces.
2.03 Reinforcement:
A. Reinforcing Steel: ASTM A615; 60 ksi yield grade; deformed billet -steel bars, uncoated finish.
B. Welded Steel Wire Fabric: Smooth wire, ASTM A185, uncoated finish, flat sheets.
C. Fibermesh: Bundled, fibrillated, virgin polypropylene fibers manufactured for use in premix
concrete and having the following characteristics:
1. Special Gravity: 0.91.
2. Tensile Strength: 70 to 100 ksi.
3. Fiber Lengths: Y2 inch,'/ inch.
4. Accepted Materials: "Fibermesh" by Fibermesh Company of Chattanooga, TN; or "Forta
CR" by Forta Corporation of Groove City, PA.
D. Dowels: ASTM A615; 40 or 60 ksi yield grade, plain steel, uncoated finish; matched sleeve and
cap one end. Provide dowel basket to hold dowels in parallel alignment.
2.04 Admixtures:
A. General: Unless specified in the mix or directed in Part 3, no admixtures shall be used without
approval of the Owner's Representative. Do not use admixtures that would result in mixing water
with a concentration of more than 150 ppm of chloride ion.
B. Air Entraining: ASTM C260.
C. Water Reducing: ASTM C494, Type A.
City of Fort Collins SECTION 02520 — Portland Cement Concrete Paving
Park Planning & Development Division Page 3 of 10
D. Accelerator: Nonchloride, ASTM C494, Type C or E.
E. Retarder: ASTM C494, Type B or D.
F. Color Agent: Davis Colors of Los Angeles, California.
2.05 Related Materials:
A. Expansion Joint Filler: ASTM D1752, closed cell polyethylene,'/2 inch thickness.
B. Joint Sealant: See Section 07000.
C. Surface Retardant: Surface retarding agent intended for exposed aggregate. Retardx-SRO" by
Prokrete of Denver, Colorado, or approved equal.
D. Curing Compound for Standard Non -Colored Walks, Curbs, Gutters, Etc: White pigmented, wax -
resin based compound, ASTM C309, Type I, Class A. Recommended by manufacturer for use on
exterior sidewalks and driveways.
E. Curing Compound for Concrete with Coloring Agent: Davis Seal Color to match colored
concrete.
F. Curing Compound and Sealer for Exposed Aggregate Concrete: Acryseal by Prokete Industries of
Denver, Colorado.
G. Curing Compound for Interior Slabs: Protex Promulsion 100 or equal.
H. Interior Floor Sealer: Protex Triple Seal or equal.
2.06 Concrete Mix:
A. Mix concrete in accordance with ASTM C94.
1. Provide concrete for non -colored sidewalk of the following characteristics:
Unit
Measurement
a. Compressive Strength
3,500 psi
at 28 days
b. Minimum Cement
564 lb./cy
c. Maximum Aggregate Size
1 '/2 inches
d. Fibrous Reinforcement
3/ lb./cy
e. Air Entrainment
4% to 6%
f Maximum Water/Cement Ratio
0.46
g. Maximum Slump
4 inches
2. Provide concrete for colored sidewalk and trail of the following characteristics
Unit
Measurement
a.
Compressive Strength
3,500 psi
at 28 days
b.
Minimum Cement
564 lb./cy
c.
Maximum Aggregate Size
1 %2 inches
d.
Fibrous Reinforcement
% lb./cy
e.
Air Entrainment
4% to 6%
f.
Maximum Water/Cement Ratio
0.46
g.
Coloring Agent
per manufacturer's recommendations
h.
Maximum Slump
4 inches
B. Use accelerating admixtures in cold weather as directed in Part 3.
C. Use set -retarding admixture during hot weather as directed in Part 3.
City of Fort Collins SECTION 02520 - Portland Cement Concrete Paving
Park Planning & Development Division Page 4 of 10
D. Water reducing agent is permitted.
2.07 Selection of Proportions:
A. Mix Design: Cost of concrete mix design is responsibility of Contractor.
B. Selection of Proportions: Use method of ACI 3013.9. Proportioning base on method of ACI 301
3.10 not allowed.
1. Field test records used for documentation of the average strength produced by a propos mix in
accordance with ACI 301 3.9.3.2 shall, in addition to the requirements listed, comply with the
following:
a. The test record shall represent production concrete from a single design mix produced
during the past year.
b. The test record shall represent concrete proportioned to produce the maximum slur
allowed by these specifications, and for air -entrained concrete, within a +0.5% of t
maximum air content allowed.
2. Mixes proportioned on the basis of trial mixtures shall meet the provisions of ACI 301 3.9.3.3.
PART 3 EXECUTION
3.01 Subgrade Preparation:
A. Shape and compact subgrade to match appropriate detail. Compact to 95% density as measured by
ASTM D698. Coordinate with Section 02200 — Earthwork, Article 3.05, Compaction.
B. Where subgrade cannot be compacted, remove Subgrade. Replace with bed course. Compact to
95% density as measured by ASTM D698.
C. Moisten subgrade to minimize absorption of water from fresh concrete. Subgrade shall not be
muddy, soft, frozen, or covered with standing water when concrete is placed.
3.02 Form Work:
A. General: Design, construct, and brace forms in accordance with ACI 301 and ACI 347. In
addition to those requirements, forms shall be placed and braced so the finished edges and joints
meet the tolerances listed later in this section.
B. Preparation of Form Surfaces:
1. Clean reused forms of concrete matrix residue; repair and patch as required to return forms to
acceptable surface condition.
2. Coat contact surfaces of forms with specified form -coating compound before reinforcement is
placed. Apply form -coating compound according to manufacturer's instructions. Do not
allow excess form -coating material to accumulate in forms or to come in contact with concrete
surfaces against which fresh concrete will be placed.
C. Slipforming: Slipforming of vertical curb and gutter sidewalks is permitted.
D. For Surfaces Exposed To View: Form faces shall be free from raised grain, tears, worn edges,
patches, dents, or other defects which would impair texture of the concrete surfaces. Minimize
number of seams in form material, and arrange seams in an orderly manner.
3.03 Reinforcement and Embedments:
A. General:
1. Fabricate, position, and secure reinforcement and embedded items according to ACI 301 and
ACI 315. Coordinate with other sections for locations, instructions, or equipment for
embedded items.
City of Fort Collins SECTION 02520 — Portland Cement Concrete Paving
Park Planning & Development Division Page 5 of 10
2. Shop drawings are not required.
3. Welding reinforcement is not permitted.
4. In the event of discrepancy, immediately notify the Owner's Representative. Do not proceed
with installation in areas of discrepancy until all such discrepancies have been fully resolved.
B. Field -Bending of Reinforcement: Reinforcement partially embedded in concrete shall not be
field -bent, except as noted on the drawings or specifically permitted by the Owner's
Representative.
C. Inspection of Reinforcement: Completed installation of concrete reinforcement must be reviewed
by the Owner's Representative before depositing concrete.
D. Unless otherwise indicated, place reinforcement where required at top of slabs on grade. Provide
/2-inch minimum cover over reinforcement.
E. Dowels: Grease sleeves, insert dowels and through form, secure dowel basket against movement.
F. Notches for Sleeving: Notch both vertical sides of walk or slab where sleeving occurs.
G. Welded wire fabric shall be overlapped one full mesh and tied.
H. Fibrous Reinforcement:
1. Add fibrous concrete reinforcement to concrete materials at the time concrete is batched in
amounts in accordance with approved submittals for each type of concrete required.
2. Mix batched concrete in accordance with manufacturer's recommendations for uniform and
complete dispersion.
3.04 Joints:
A. General: Place joints in accordance with ACI 301. Conform to the tolerances listed later in Part
3.
B. Isolation/Expansion Joints: Isolation joint and expansion joint are synonymous for concrete
paving.
1. Place isolation joints where work abuts existing walls, curbs and structures, and where shown
on the drawings.
2. Interrupt reinforcement at isolation joint. Install dowels only where indicated on drawings.
3. Joint filler shall extend full depth of the slab. Hold back filler from top of slab as required for
sealant. Attach joint filler to first placement.
4. Seal all expansion joints per Section 07900.
C. Keyed/Construction Joints: Keyed joint and construction joint are synonymous for concrete
paving.
1. Reinforcement, if required, shall continue through the joint.
2. Install where indicated on drawings, or where required by concrete delivery or finishing rate.
3. Key first placement. Key shall be I'/ inches wide and inches deep.
4. After first placement has hardened, clean and roughen face. Install control joint form at top of
slab.
5. Subject to Owner's Representative approval; manufactured leave -in -place cold joint form may
be used.
D. Control/Score Joint: Control joint and score joint are synonymous for concrete paving.
1. Control joints shall penetrate 1/3 of slab thickness.
City of Fort Collins SECTION 02520 — Portland Cement Concrete Paving
Park Planning & Development Division Page 6 of 10
2. Sawn Joints: Control joints on play area curb shall be sawn. Kerf shall be 3/16-inch wide.
Start cutting as soon as concrete is able to be sawn without dislodging aggregate. Complete
cutting before shrinkage cracks occur. Joints perpendicular to walls may be less than required
depth within 6 inches of the wall, and may stop 2 inches from the wall. Wash slurry from
concrete to avoid staining of slab.
3. Tooled Joints: Control joints may be cut into the plastic concrete during finishing operations.
Tooled joints shall have % radius, and shall not incorporate a troweled edge unless
specifically noted on the drawings.
4. Formed control joints are permitted only in conjunction with keyed joints.
5. Unless otherwise indicated, provide control joints at the following intervals:
Use Type Maximum Spacing
Colored and non -colored sidewalk Sawn Joints 10' c-c &
Continuous along centerline
3.05 Concrete:
A. Replacement Inspection: Form work installation, reinforcing steel placement, and installation of
all items to be embedded or cast in, to be verified by the Owner's Representative prior to
placement.
B. General: Comply with ACI 301, ACI 304, and as herein specified.
C. Added Water: Concrete mix has been designed to a specific water cement ratio in order to
enhance durability of the final product. Do not add water at the job site or concrete will not be
accepted.
D. Cold Weather Placement: When depositing concrete after the first frost or when the mean daily
temperatures area below 40 degrees, follow recommendations of ACI 306 as modified herein. Use
specified accelerator. Maintain concrete temperature at a minimum of 55 degrees for not less than
72 hours after depositing. Do not place concrete without approval of the Owner's Representative
on days when temperature at 9:00 a.m. is below 30 degrees. Job -cured cylinders for verification of
strength and/or the adequacy of the Contractor's protective methods will be required.
E. Hot Weather Placement: When depositing concrete in hot weather, follow recommendations of
ACI 305 as modified herein. When the air temperature is expected to exceed 90 degrees, the
Contractor shall obtain acceptance from the Civil Engineer or Owner's Representative of the
procedures to be used in protecting, depositing, finishing, and curing the concrete. The
temperature of concrete at the time of placement shall not exceed 90 degrees. Protect to prevent
rapid drying. Start finishing and curing as soon as possible. Specified water reducing retarding
admixture may be used. The use of continuous wetting or fog sprays may be required by the
Owner's Representative for 24 hours after depositing.
F. Placing: Deposit and consolidate concrete slabs in a continuous operation, within the limits of
construction joints, until the placing of a panel or section is completed. Deposit concrete as nearly
as practicable in its final location to avoid segregation.
G. Consolidation: Consolidate concrete with internal vibrators with a minimum frequency of 7,000
rpm. Maintain one standby vibrator for every three vibrators used. Consolidate according to ACI
309. Do not transport concrete with vibrators. Work concrete into corners and around
embedments and reinforcement.
H. Surface Leveling: Strike off and level surface with screed of sufficient length to span the slab.
On slabs greater than 15 feet wide, use intermediate screed strips.
City of Fort Collins SECTION 02520 — Portland Cement Concrete Paving
Park Planning & Development Division Page 7 of 10
Jason Stutzman, P.E., Project Manager at (970) 221-6366.
RECEIPT OF THIS ADDENDUM MUST BE ACKNOWLEDGED BY A WRITTEN STATEMENT ENCLOSED
WITH THE BID/QUOTE STATING THAT THIS ADDENDUM HAS BEEN RECEIVED.
Page 2 of 2
3.06 Finishes:
A. Float Finish: After surface stiffens enough to support the operation, float with hand floats or
powered disc floater. Use magnesium float; do not use wood float on air entrained concrete.
Check surface planeness with a 10-foot straight edge, applied at not less than two different angles.
Cut down high spots and fill low spots to produce a surface with Class B tolerance. Refloat the
slab to a uniform sandy texture.
B. Broom Finish: Concrete flatwork shall receive a heavy broom finish applied at a right angle to the
direction of travel. The plaza area shall have smooth troweled joints, 1'/z inches from the
centerline of the joint, to result in a total trowel width of 3 inches. All other flatwork shall have
broom finish over joints.
C. Exposed Aggregate Finish: Immediately after floating, apply surface retardant. Apply retardant
uniformly. Cover with polyethylene sheet to retain moisture. When mortar is hard enough to
retain aggregate but soft enough to be removed by brushing, wash the surface with water and
remove mortar from surface aggregate by brushing. Do not dislodge aggregate.
D. Coordinate rate of concrete placement with pace of washing crew.
E. Formed Finishes:
1. Surfaces Not Exposed to View: Patch tie holes and defects. Chip off fins greater than '/4 inch
in height.
2. Surfaces Exposed to View: Patch tie holes and defects. Completely remove fins.
Schedule of Finishes:
1. Sidewalk— heavy broom finish.
F. Notch both vertical sides of concrete flatwork to indicate location of irrigation sleeves.
3.07 Curing/Sealing:
A. Apply curing compound within 30 minutes of completing finish. Follow manufacturer's
recommendations for applying compound. Reapply in areas exposed to rain within 3 hours of
initial application. Maintain continuity of coating and repair damage during 7-day curing period.
Follow manufacturer's instructions for sealing interior slabs.
3.08 Tolerances:
A. Surface Planeness: Unless otherwise specified, produce slabs with a Class B tolerance.
1. Finishes with Class B tolerances shall be true planes within '/o inch in 10 feet, as determined
by a 10-foot straight edge placed anywhere on the slab in any direction.
2, Slope interior slabs to drains as indicated.
B. Formed Surfaces, Joints, and Embedments: Unless otherwise specified, the finished work shall
meet the following tolerances:
1. Variations of formed, or cut or tooled linear element:
a. In 20 feet: '/z inch.
b. For entire length: 1 inch.
3.09 Field Quality Control:
A. Field inspection and testing will be performed under provisions of Paragraph 1.06, Tests, and as
specified below.
B. Concrete Tests:
City of Fort Collins SECTION 02520 — Portland Cement Concrete Paving
Park Planning & Development Division Page 8 of 10
1. Shall be provided by the Contractor and shall be accordance with requirements of ACI 301,
Chapter 16 — Testing, except as noted or modified in this section.
a. Strength test.
i. Mold and cure four cylinders from each sample.
ii. Test one at 7 days and one at 14 days for information and one at 28 days for
acceptance. Keep the remaining one as a spare to be tested as directed by the Owner.
Minimum samples.
Collect the following minimum samples for each 28-day strength concrete used in the
work for each day's placing:
uantit
50 cubic yards or less
50 to 100 cubic yards
100 cubic yards or more
Number of Samples
one
two
two plus one sample for each
additional 100 cubic yards
c. Sample marking.
i. Mark or tag each sample of compression test cylinders with date and time of day
cylinders were made.
ii. Identify location in work where concrete represented by cylinders was placed.
iii. Identify delivery truck or batch number, air content, and slump.
d. Slump test.
Conduct test for each strength test sample and whenever consistency of concrete appears
to vary.
e. Air content.
Conduct test from one of first three batches mixed each day and for each strength test
sample.
C. Acceptance of Concrete:
1. If the average of three consecutive 7-day tests falls below the specified 7-day strength, the
Owner shall have the right to require conditions of temperature and moisture necessary to
secure the required strength and may require core tests in accordance with ASTM C-42.
2. Strength level of concrete will be considered satisfactory so long as average of all sets of three
consecutive strength test results equals or exceeds specified 28-day strength and no individual
strength test result falls below specified strength by more than 500 psi.
D. Failure of Test Cylinder Results:
1. Upon failure of the 28-day test cylinder results, Owner may require Contractor, at his expense,
to obtain and test at least three cored samples from area in question.
2. Concrete will be considered adequate if average of three core tests is at least 85 percent of,
and if no single core is less than 75 percent of the specified 28-day strength.
3. Upon failure of core test results, Owner may require Contractor, at his expense, to perform
load tests as specified in ACI 318, Chapter 2.
4. In the event an area is found to be structurally unsound, the Owner may order removal and
replacement of concrete as required. The costs of the core tests, the load test and the
structural evaluation shall be borne by the Contractor.
5. Fill all core holes with a non -shrink grout as Master Builders Masterflo 713 or approved
equal.
City of Fort Collins SECTION 02520 — Portland Cement Concrete Paving
Park Planning & Development Division Page 9 of 10
E. Maintain records of placed concrete items. Record date, location of pour, quantity, air
temperature, and test samples taken.
END OF SECTION
City of Fort Collins SECTION 02520 — Portland Cement Concrete Paving
Park Planning & Development Division Page 10 of 10
DMSION 2
SECTION 02900 - SITE REVEGETATION
PART 1-GENERAL
1.01 Description of Work
A. The work covered by this specification includes the furnishing of all materials and application of
fertilizer, seed and mulch to areas defined in the plans or required by field conditions. The work
shall be completed in accordance with these specifications, accepted horticultural practice, and
with the plans.
1.02 Related Work
A. See appropriate sections for site work needed prior to work required in this section. Obtain
approval from the Engineer prior to starting work.
1.03 Submittals
A. Submit manufacturer's specifications and literature on all products.
B. Submit materials list including quantities and description of materials.
1.04 Quality Assurance
A. Source Quality Control: Manufacturer's test for purity and germination of seed, dated within six
months of seeding.
B. Certificates: Manufacturer's certification that fertilizer meets specification requirements.
PART 2 - MATERIALS
2.01 Topsoil
A. Topsoil shall be select earth material of loose friable loam reasonably free of admixtures of
subsoil, refuse stumps, roots, rocks, brush, weeds or other material which can be detrimental to the
proper development of ground cover.
2.02 Grass Seed
A. Grass seed shall be of the latest crop available. Seed shall meet Colorado Department of
Agriculture Seed Laws, Chapter 35, Article 27.
B. The following seed mix is for Redtail Grove Natural Area. The seed mixture shall be applied at
the pure live seed (PLS) rate per acre listed:
Seed Mix
Species Name
% in Mix
Lbs.lPLS
Western wheatgrass
Pascapyrum smithii
15%
4.6
Sideoats gramma
Bouteloua curtipendula
15%
2.8
Blue gramma
Bouteloua gracilis
15%
0.6
Buffalograss
Buchloe dactyloides
30%
18.9
Prairie junegrass
Kaeleria macrantha
10%
0.2
Needle-n-thread
Stina camata
15%
4.6
100 %
City of Fort Collins Section 02900 — Site Revegetation
Park Planning & Development Division Page 1 of 3
C. Do not use seed which has become wet, moldy, or otherwise damaged in transit or in storage.
D. The Contractor shall compensate for percentage of purity and germination by furnishing sufficient
additional seed to equal the specified pure live seed product. The formula for determining the
quantity of pure live seed (PLS) shall be: Pounds of Seed (Bulk) x Purity x Germination =
Pounds of Pure Live Seed (PLS).
E. The Contractor shall present to the Engineer a certificate of the PLS test of the grass seed which he
intends to use. All grass furnished shall be delivered in sealed bags showing the weight, analysis
and vendor's name. Seed tags shall be collected by the project manager.
2.03 Fertilizer
A. Commercial fertilizer type and application rate shall be:
Commercial Fertilizer 01-52-0) Percent available by weight
Nitrogen 11
Phosphorus 52
Potassium 0
Application rate: 1001bs per acre
2.04 Hydraulic Mulch
A. Hydraulic mulch material shall consist of at least ninety percent (90%) virgin wood cellulose fiber
and be free of any substance of factor which might inhibit germination or growth of grass seed.
The wood cellulose fibers shall have the property of becoming evenly dispersed and suspended
when agitated in water.
B. Hydraulic mulch shall be clean and shall not contain the seeds of noxious weeds or unspecified
grasses. It shall be dyed a color to allow visual metering of its application. When sprayed
uniformly on the surface of the soil, the fibers shall form a blotter -like ground cover which readily
absorbs water and allows infiltration to the underlying soil.
C. The contractor shall obtain and submit to the project manager certifications from suppliers of
hydraulic mulch that laboratory and field testing of their product has been accomplished and that it
meets all of the foregoing requirements.
D. Application Rate - 2,000 pounds per acre.
2.05 Organic Tackifier/Binder
A. Tackifier shall be an approved commercial grade product suitable for use with virgin wood
cellulose fiber mulch. Any tackifier shalt be a non -toxic, non -corrosive, all organic powder which
forms a resilient, rewettable membrane when combined with wood fiber mulches and water.
B. Application Rate — Follow manufacturer's recommendation.
2.06 Straw Mulch
A. All hay or straw mulch shall be grass hay or straw. At least seventy percent (70%) of the mulch
by weight shall be ten inches (10") or more in length. Mulch shall not contain any noxious weed,
must, mold, cake or decay.
B. Application Rate — 2 tons per acre.
City of Fort Collins Section 02900 — Site Revegetation
Park Planning & Development Division Page 2 of 3
PART 3 - EXECUTION
3.01 General
A. The pattern of seeding and mulching, shall be as detailed or as required by field conditions to
provide a uniform stand of grass acceptable to the City. In no case shall revegetation occur within
30 days of the application of a chemical weed control substance.
B. Warranty excludes replacement of plants after final acceptance because of injury by storm,
drought, drowning, hail, freeze, insects or diseases.
3.02 Preparation
A. Verify that soil preparation has been completed prior to seeding.
B. Seed areas damaged by construction activities as directed by the Engineer.
C. Apply by broadcasting or drilling at the rate specified herein.
D. Selection of the time of seeding shall be Contractor's responsibility, consistent with erosion
control.
E. Rework previously prepared areas that have become compacted or damaged by rains or traffic.
F. Do not drill or sow during windy weather or when ground is frozen or untillable.
G. Cover seed to depth between % to % inch by raking or harrowing.
H. Firm seed areas with roller weighing maximum of 100 lbs. per foot to width.
3.03 Drill Seeding
A. All seed shall be drilled 0.25 inch to 0.50 inch into the soil at the specified rate with a mechanical
power -drawn drill or Brillion seeder. Seed shall be applied in a minimum of two passes at 90
degrees two each other.
3.04 Broadcast Seeding
A. In areas inaccessible to a drill seed shall be uniformly broadcast at twice (2x) the specified rate
and raked in.
3.05 Hydraulic Mulching
A. After seeding by broadcast or drilling, use wood cellulose fiber mulch at 2,000 lbs/acre, with
tackifrer.
B. Combine with water to produce a slurry. Perform hydraulic application in such a manner that the
liquid carrier will uniformly distribute the material over the entire area to be mulched. Do not
compact.
3.06 Areas to be Seeded
A. All areas that have been damaged or disturbed by the Contractor's operation shall be reseeded
according to these specifications and as indicated on the plans.
3.07 Maintenance
A. No maintenance is required, UNLESS NOTED ON THE BID SCHEDULE.
END OF SECTION
City of Fort Collins Section 02900 — Site Revegetation
Park Planning & Development Division Page 3 of 3
No Text
DIVISION 2
SECTION 02100 - MOBILIZATION
PART 1 -GENERAL
1.01 Work Included
A. Prepare the site for construction.
B. Move in and move out personnel and equipment.
C. Set up and remove temporary offices, buildings, facilities and utilities.
1.02 Site Conditions
A. The City has provided the right-of-way, easement or project site for all permanent access or
permanent construction for the project. Any additional access, access right-of-way, construction
areas, or additional needed land which may be involved in the construction of this project shall be
the responsibility of the Contractor.
B. The land owned by the City may be used as site headquarters, storage yard, or base of operations
provided that the use of said land meets with all of the requirements and restrictions imposed by
the City at the time of usage.
1.03 Site Preparation for Contractor Occupancy
A. The Contractor shall provide all temporary facilities as required for performing the work. The
Contractor shall secure and maintain proper storage areas for equipment and materials in locations
she/he may deem necessary for the proper execution of the job as approved by the City
Representative. No storage yard or project headquarters site may be utilized in conflict with
objections from the adjacent property owners unless the Contractor obtains from the City specific
written permission for such objectionable use. No objectionable material will be allowed to blow
from, wash off or drain off of any storage yard on to adjacent property.
B. The Contractor shall maintain all storage yards in as neat and orderly a manner as possible,
allowing no accumulation of waste materials or disposal piles. The Contractor may construct a
temporary security fence for the protection of materials, tools, and equipment. The fence shall be
maintained during the construction period. Upon completion of work, the security fence shall be
removed from the site. The Contractor shall provide adequate parking facilities within the
designated area for personnel working on the project.
C. The Contractor shall obtain the necessary permits for connection to necessary services provided by
utility companies serving the project area.
D. Materials, equipment, and work required for temporary storm water management during the
construction period shall be provided by the Contractor as required to ensure public safety and to
protect the work in progress and materials stored on site.
1.04 Damage or Use -Fee Claims
A. Any damage or use -fee claims filed against the Contractor may become apart of the final
settlement of this project and may be cause for delay of final acceptance or delay of final payment.
City of Fort Collins Section 02100 — Mobilization
Park Planning and Development Division Page 1 of 2
PART 2 - NOT USED
PART 3 - EXECUTION
3.01 Obstructions
A. The location of some utilities and obstructions may not be shown. Bidders are advised to carefully
inspect the existing facilities before preparing their proposals. The removal and replacement of
minor obstructions such as electrical conduits, air, water, and waste piping and similar items shall
be anticipated and accomplished, even though not shown or specifically mentioned. Major
obstructions encountered that are not shown on the Contract Drawings or could not have been
foreseen by visual inspection of the site prior to bidding should immediately be brought to the
attention of the City Representative. The City Representative will make a determination for
proceeding with the work. If the City Representative finds that the obstruction adversely affects
the Contractor's costs or schedule for completion, a proper adjustment to the Contract will be made
in accordance with the General Conditions.
3.02 Demolition
A. Any pipes or existing structures encountered during construction shall be preserved until accepted
for removal by the City Representative. The Contractor shall be required to repair pipes or
structures in use that are damaged during construction at no cost to the City. The removal of
abandoned pipes shall be reviewed by the City Representative.
3.03 Removal and Salvage of Materials
A. The Contractor shall carefully remove materials specified to be reused or salvaged so as not to
damage the material. Reuse by the Contractor of salvaged material will not be permitted, except as
specifically shown or specified herein. Existing materials to be removed or replaced and not
specifically designated for salvage shall become the property of the Contractor. Provide and
maintain dust tight temporary partitions, bulkheads, or other protective devices during the
construction to permit normal operation of the existing facilities. Construct partitions of plywood,
insulating board, plastic sheets, or similar material.
END OF SECTION
City of Fort Collins Section 02100 — Mobilization
Park Planning and Development Division Page 2 of 2
DIVISION 2
SECTION 02200 - EARTHWORK AND GRADING
PART 1 —GENERAL
1.01 Description of Work
A. The Contractor shall provide all labor, materials and equipment necessary to perform the work
items called for on the bid schedule.
B. The Contractor shall perform all excavation regardless of the type, nature, or condition of material
encountered, as specified or required in order to accomplish the construction.
1.02 City Furnished Materials
A. None, unless otherwise noted on the Bid Schedule.
1.03 Site Conditions
A. A geotechnical investigation may have been performed for the City in order to obtain relative data
concerning the character of material in and upon which the project is to be built. If an
investigation has been performed, the information will be available to the Contractor for
information purposes only, and is not to be considered a part of the Contract Documents. The
Contractor shall satisfy himself as to the kind and type of soil to be encountered and any water
conditions that might affect the construction of the project.
B. The locations of existing utilities are shown in an approximate way only and not all utilities may be
shown. The Contractor shall determine the exact location of all existing utilities prior to
commencing work. The Contractor shall be fully responsible for any and all damages that might
be occasioned by his failure to exactly locate and preserve any and all utilities. If utilities are to
remain in place, the Contractor shall provide adequate means of support and protection during
construction.
C. Should drawn, or incorrectly drawn, piping or other utilities be encountered during excavation, the
Contractor shall advise the City within thirty (30) minutes of encountering the utility. The
Contractor shall cooperate with the City and utility companies in keeping respective services and
facilities in operation to the satisfaction of the respective owners. The City reserves the right to
perform any and all work required should the Contractor fail to cooperate with the respective
companies, and back charge the Contractor for any and all expenses.
D. The Contractor shall provide barricades and signs in accordance with the Uniform Manual of
Traffic Control Devices where applicable. The Contractor shall maintain all devices in a working
manner.
1.04 Fill Material
A. Excess fill material, including rock, gravel, sod, broken concrete or asphalt, plaster, etc., shall be
hauled off the site and disposed of in accordance with applicable State and local regulations.
City of Fort Collins Section 02200 — Earthwork and Grading
Park Planning $ Development Division Page 1 of 5
B. Additional fill material, if required, shall be hauled to the site from off the site as a necessary part
of the work. Material composition shall be subject to the requirements of the specifications.
1.05 Testing and Inspections
Coordinate and schedule testing with City Representative.
PART 2 - MATERIALS
2.01 Soil Materials
A. Coarse -grained soils free from debris, roots, organic material, and non -mineral matter containing
no particles larger than 4-inch size and classified as either:
1. Sands with fines (SM, SC) and less than 25 percent of the soil particles passing the No. 200
sieve, or
2. Clean sands (SW, SP)
3. Native soils as determined acceptable by the Engineer.
2.02 Filter Fabric
A. Filter Fabric shall be Typar 3451 W, Miraft 70OX or approved equal.
PART 3 - EXECUTION
3.01 Preparation
A. Field measurements: Before commencing work, locate all baselines and coordinates required for
control of the work; establish required grade staking for control of excavation, fill and
embankment construction. Filed verify by excavation the location all utility crossings, service
connections, and connections to existing lines before proceeding with earthwork.
B. Layout Lines and Levels:
1. The drawings indicate existing elevations and proposed elevations. The existing elevations
and proposed are given for the convenience of the Contractor to assist him in arriving at the
quantities of excavation, grading, backfilling etc.
2. Before earthwork operations are started, all construction items shall be completely staked out
for the Owner's approval. For any area with a two- percent slope or flatter, the Contractor
shall lay out a 50-foot on -center grid and calculate the exact elevation at every intersection of
the grid lines. These calculations will be approved by the Owner's Representative.
C. Removal of Topsoil: Strip existing earthen material (topsoil) to a depth of 4 inches over the entire
site. Stockpile on site in area approved by Owner's Representative. Keep topsoil segregated.
Place, grade, and shape stockpile for proper drainage.
3.02 Excavation
A. Prior to beginning excavation operations, accomplish all site preparation in accordance with these
specifications. Perform excavation of every description to the lines and grades indicated on the
drawings.
City of Fort Collins Section 02200 — Earthwork and Grading
Park Planning & Development Division Page 2 of 5
B. Complete excavation work to the grade elevations shown on the drawings for all areas to be paved.
3.03 Clearing the Site
A. All areas underlying new structures, paved areas, site fills and embankments shall be cleared of
stumps, shrubs, brush, and other vegetative growth.
B. Any material containing roots, grasses and other deleterious or organic matter generally found in
the top six inches of undisturbed natural terrain shall be stripped from all areas requiring
excavation, grading, trenching, subgrade preparation for foundations and embankment work. The
City will require stripped top soil deemed suitable for spreading over the finished grades to be
stockpiled and preserved until the finished grading operation, at which time it shall be spread
uniformly over areas to be seeded or sodded.
C. Upon completion of the project, completion of a particular phase of the projector termination of
the use of any particular area, site, storage yard right-of-way or easement, the Contractor shall
promptly and neatly clean up the area and re-establish the ground to the contours required by the
project or conditions prior to project commencement.
3.04 Earth Fill Construction
A. The Contractor shall perform all grading to the lines and grades specified and/or established by the
Engineer, with an appropriate allowance for topsoil. All slopes shall be free of all exposed roots
and stones exceeding 3-inch diameter, which are loose and liable to fall. Tops of banks shall be
rounded to circular curves not less than 6-feet in radius.
B. Rounded surfaces shall be neatly and smoothly trimmed. Topsoil shall be replaced to a depth of
4-inches in areas to be revegetated.
C. The Contractor shall protect the fill against freezing when atmospheric temperature is less than 35
degrees F (1 degree Q.
3.05 Compaction
A. The Contractor shall meet minimum percentage density specified for each area classification as
follows. Percentage of Maximum Density Requirements: Compact soil to not less than the
indicated percentages of maximum density relationship determined in accordance with ASTM D
698.
Foundations, Paved Areas, Utilities and Sidewalks - 95 percent
2. Unpaved Areas - 90 percent
B. Control moisture content within 2% of optimum moisture content as determined by ASTM D 698.
Where subgrade or layer of soil material is too dry to permit compaction to the specified density,
uniformly apply water to surface of cut area, subgrade, or loosely placed layer of soil material.
Mix soil and applied water by blading, disking, or other methods to achieve uniform moisture
content throughout the soil mass to be compacted.
C. Remove and replace, or scarify and air dry, soil material that is too wet to permit compaction to
specified density. Soil material that has been removed because it is too wet to permit compaction
City of Fort Collins Section 02200 - Earthwork and Grading
Park Planning & Development Division Page 3 of 5
may be stockpiled or spread and allowed to dry. Assist drying by disking, harrowing or
pulverizing until moisture content is reduced to a satisfactory value.
D. Puddling is not an acceptable method of compaction.
3.06 Grading
A. Paved Areas: Immediately prior to placing structural pavements, shape area to the required
lines, grades, and limits to provide the finished elevations indicated and roll with an approved
heavy vibratory roller until compacted to the specified density. Maintain moisture content within
2% of optimum during final rolling and until subgrade is covered by subsequent construction.
Remove loose material and protect subgrade until covered. The subgrade under all paved areas
and the play area shall conform to the elevations shown on the drawings.
B. Landscape Area and Remainder of Site:
1. Rough grade areas as indicated on grading plan to 4 inches below finish grade.
After rough grading is finished, compacted and approved, scarify area to a depth of at
least 6 inches.
2. Place previously stockpiled topsoil in all areas within the limits of the project not
indicated to receive subsequent foundations, slabs on grade, walks, safety surfacing
or other similar materials.
3. Uniformly distribute topsoil on the disturbed area and evenly spread to a thickness of
4 inches deep after light compaction. Perform spreading so that planting can proceed
with little additional soil preparation or tillage. Do not place topsoil when subgrade
is frozen, excessively wet, extremely dry or in a condition otherwise detrimental to
specified grading, seeding and planting specifications.
C. Finish Grading:
1. Grade all excavated sections, filled sections, construction disturbed areas and
adjacent transition areas to finish elevation. Make finished surfaces smooth,
compacted and free from irregular surface changes.
2. Unless indicated otherwise on drawings, finish grade area adjacent to sidewalks and
pavements to %2 inch below finish elevation of sidewalk and pavement.
3. Remove all construction debris. Grades not otherwise indicated shall be uniform
levels or slopes between such points and existing finish grade. Abrupt change in
slopes shall be rounded.
3.07 Settlement
A. Where completed compacted areas are disturbed by subsequent construction operations or adverse
weather, the Contractor shall scarify the ground surface, re -shape, and compact to required density
prior to further construction.
B. Any settlement in backfill, fill, or in structures built over the backfrll or fill, which may occur
within the guarantee period in the General Conditions will be considered to be caused by improper
compaction methods and shall be corrected at no cost to the City. Any structure damaged by
settlement shall be restored to their original condition by the Contractor at no cost to the City.
City of Fort Collins Section 02200 — Earthwork and Grading
Park Planning & Development Division Page 4 of 5
3.08 Disposal of Excess Excavation and Waste Materials and Special Requirements
A. The Contractor shall dispose of all excess excavated material not required for fill on -site, as
directed by the Engineer.
B. The Contractor shall remove and be responsible for legally disposing of excess fill material not
placed on -site, waste materials, trash and debris.
C. The Contractor shall conduct all site grading operations and other construction activities to
minimize erosion of site soil materials. He/she shall be responsible to maintain streets/public
ROW daily by removing any spillage of dirt, rocks or debris from equipment entering or leaving
the site.
END OF SECTION
City of Fort Collins Section 02200 — Earthwork and Grading
Park Planning & Development Division Page 5 of 5