SPECIAL PROVISIONS

The CDOT Standard Specifications are modified with the following Project Special Provisions.

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REVISION OF SECTION 101

DEFINITIONS AND TERMS

Section 101 of the CDOT Standard Specifications is hereby revised for this project as follows:

The following changes are made to Subsection 101.02:

Add the following definition:

Approved Equal. A product, component or process whose use in or on a particular project is specified as a standard for comparison purposes only. The "equal" product, component or process shall be the same or better than that named in function, performance, reliability, quality, and general configuration. Determination of equality in reference to the project design requirements will be made by the Engineer. It is the responsibility of the supplier to provide all necessary information for determining equality.

Delete the definition for CDOT Resident Engineer and replace with the following:

Public Works Director. The Public Works Director for the City, or their duly authorized representative, is responsible for public works activities within the City. The Public Works Director is responsible for final decisions relating to Contractor claims for contract modification orders, additional compensation, or extensions of contract time. All references to “CDOT Resident Engineer” shall be replaced with “Public Works Director.”

In the definition for Contract, delete the first paragraph and replace with the following:

The written agreement between the City and the Contractor setting forth the obligations of the parties for the performance of the work and the basis of payment.

Delete the definition for Contractor and replace with the following:

Contractor. The individual, firm, or corporation contracting with the City for performance of prescribed work.

Delete the definition for Department and replace with the following:

Department. Department of Public Works. A department with the City.

Add the following definition:

Easement. The right to use a defined area of property for a specific purpose or purposes as set forth in a document which has been made a part of the Contract Documents.

Delete the definition for Engineer and replace with the following:

Engineer. The CIP Program Manager of the Department acting directly or through an authorized representative, who is responsible for engineering and administrative supervision of the project. For the purpose of these specifications, the Engineer is responsible for initial decisions relating to Contractor claims for additional compensation or additional time. The Engineer or Director are the City representatives who may approve modifications to Contract documents or drawings.

Delete the definition for Holidays and replace with the following:

Holidays. Holidays recognized by the City are:

New Year’s Day Martin Luther King, Jr. Day (observed) Presidents’ Day Memorial Day Juneteenth Independence Day Labor Day Veterans’ Day Thanksgiving Day Day after Thanksgiving Day Christmas Day

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When New Year’s Day, Juneteenth, Independence Day, Veterans’ Day or Christmas Day falls on a Sunday, the following Monday shall be considered a holiday. When one of these days falls on a Saturday, the preceding Friday shall be considered a holiday.

Additional legal holidays, when designated by the Governor or the President of the United States, may also be recognized by the City.

Add the following definitions:

Lump Sum. A method of payment providing for one all-inclusive cost for the work or for a particular portion of the work; including any incidental costs necessary to perform that item of work.

Notification of Award. A written notification of acceptance of the bid from the City to the successful bidder.

Delete the definition for Preconstruction Conference and replace with the following:

Pre-construction Conference. A meeting of City project personnel, Contractor project personnel, and other stakeholders held prior to the beginning of construction at which topics pertinent to the successful completion of the work are discussed.

Delete the definition for Project Engineer and replace with the following:

Project Engineer. The Engineer’s duly authorized representative who may be a City employee or an employee of a consulting engineer (consultant) under contract to the City as defined below:

(a) City Project Engineer. The City employee who is the Engineer’s duly authorized representative. The City Project Engineer is in direct charge of the work and is responsible for the administration and satisfactory completion of the project under contract.

(b) Consultant Project Engineer. The consultant employee under the responsible charge of the consultant’s Professional Engineer who is in direct charge of the work and is responsible for the administration and satisfactory completion of the project. The Consultant Project Engineer’s duties are delegated by the Engineer in accordance with the scope of work in the consultant’s contract with the City. The Consultant Project Engineer is not authorized to sign or approve Contract Modification Orders.

Delete the definition for Proposal Guaranty and replace with the following:

Bid Bond. The security required to be submitted with each proposal to guarantee that the bidder will enter into the Contract if the proposal is accepted. All references to “Proposal Guaranty” shall be replaced by “Bid Bond.”

Delete the definition for Region Transportation Director and replace with the following:

Region Transportation Director. All references to “Region Transportation Director” shall be replaced by “Public Works Director.”

Delete the definition for Right of Way and replace with the following:

Right of Way. A general term denoting land, property, or interest therein, usually in a strip, acquired for or devoted to a highway, street, alley, or other access.

In the definition for Special Provisions, delete the 2nd sentence and replace with the following:

Special provisions fall within one of the three following categories and take precedence as specified in subsection 105.09:

In the definition for Special Provisions, add the following paragraph:

(c) City Special Provisions. Additions and revisions to the Standard and Supplemental Specifications specific to the City project.

In the definition for Specifications, delete (a) and replace with the following:

(a) Standard Specifications: The Colorado Department of Transportation’s book (including errata) titled Standard Specifications for Road and Bridge Construction. The book is divided into three parts namely:

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Add the following definition:

Utility. Tracks, overhead or underground wires, pipelines, conduits, pipes, ducts, or structures, owned, operated, or maintained in or across a public right-of-way or easement.

In the definition for Workplace Violence, replace all references to CDOT with the City.

REVISION OF SECTION 201

CLEARING AND GRUBBING

Section 201 of the CDOT Standard Specifications is hereby revised for this project as follows:

In Subsection 201.02, delete the second paragraph and replaced with the following:

Removals shall be completed to the required subgrade elevation for the work, or as directed by the Owner's Representative.

In Subsection 201.02, the third paragraph shall include the following:

All tree stumps within the project limits will be ground, grubbed and removed to a depth of 24 inches below required subgrade elevation.

In 201.02, delete the eighth paragraph and replaced with the following:

Locate and suitably identify trees and improvements indicated to remain. No trees or shrubs shall be removed until marked and approved by the Owner's Representative. Branches of trees extending over the roadbed shall be trimmed to give a clear height of 16 feet above the roadbed surface. All trimming will be done in accordance with good tree surgery practices by a qualified and licensed tree service company.

The stumps of all trees shall be grubbed a minimum of 24 inches below finish grade.

Subsection 201.02 shall include the following:

Clearing and grubbing shall include removal of trees not designated to be protected, landscape, decorative rock, rock and concrete curbwalls, miscellaneous landscaping materials (including all rock mulch, organic mulch and rip-rap stone), sod, shrubs, plant materials, trees and other materials within the work area not otherwise listed as a pay item.

Work involving trees to remain shall conform to applicable provisions of Section 219.

No removals shall take place until marked by Contractor and approved by the Owner's Representative

Subsection 201.03 shall include the following:

Removal of trees will be measured by the actual number of trees removed with specified diameters measured

4.5 feet above the ground surface. Multiple tree trunks from one root structure with one trunk being the specified diameter will be considered one tree. Trees with a diameter less than 4” or when removal of trees is not included as a separate pay item, shall be included in clearing and grubbing. Removal of remaining vegetation as required by the project shall be included in clearing and grubbing.

Subsection 201.04 shall include the following:

Pay Item Pay Unit

Removal of Tree (< 12”) Each

Removal of Tree (> 12") Each

REVISION OF SECTION 202

REMOVAL OF STRUCTURES AND OBSTRUCTIONS

Section 202 of the CDOT Standard Specifications is hereby revised for this project as follows:

Subsection 202.02 shall include the following:

Areas within existing asphalt pavement that are designated for removal or patching shall be sawcut to the full depth of the asphalt or cut by a method approved by the Engineer which leaves a vertical face on the existing pavement and no deformation of the surface at the cut. Limits of cutting for patching shall be as directed by the Engineer.

All street cuts shall be in straight lines. Irregular shaped cuts with more than four (4) sides or cuts within existing patches shall not be allowed. Street cuts shall have no longitudinal joints within the wheel tracks.

Irrigation lines to be abandoned shall be adequately capped at the point of abandonment to prevent leaks or blowouts of the line that is to remain. The irrigation lines that are to be abandoned can remain in place unless removal is necessary to allow other work.

Subsection 202.03 shall include the following:

All inlet castings, manhole rings and covers and other metal items relating to structures to be removed shall remain the property of the City or the owning utility company. This material shall be reused on the project where possible or as directed by the Engineer. Material not reused on the project shall be delivered to the City or owning utility company unless arrangements have been made for it to be picked up by the City or owning utility company.

Subsection 202.07 shall include the following:

Concrete from curbs, gutters, sidewalks, and pavements may not be used in fills unless crushed to meet the gradation requirements for Class 4 Aggregate Base Course.

Subsection 202.09 shall include the following:

Planers shall operate moving against traffic in areas being planed in order to ensure that trucks used in hauling removed materials will be able to arrive and depart with the flow of traffic.

Planing shall result in a surface acceptable to the Engineer. Acceptability shall be based upon the following criteria:

(a) Free of surface ridges in excess of ¼ inch.

(b) Surface area free of excess surface fines.

(c) All planed surfaces, especially wheel ruts, show scoring by planer teeth.

(d) Specified cut depth attained at edges of roadway appurtenances and curb lips.

Vertical cuts adjacent to traffic lanes from rotomilling over 1" depth shall be delineated at 50 foot intervals immediately after removal operations.

The Contractor shall use caution when planing around manholes, water valve boxes, and other roadway appurtenances. Manholes, water valve boxes, and other similar structures shall either be adjusted to below the bottom of the cut prior to commencing planing operations or cut around using planing equipment. The maximum deviation between the top of the milled pavement and top of the manhole or water valve box shall be no more than ¾ inch in areas open to traffic. This condition may be achieved by placing a temporary wedge of asphalt around the structure. This temporary taper shall be removed prior to placement of new pavement.

Subsection 202.11 shall include the following:

Removal of existing asphalt pavement for patching, to include asphalt sawing or other approved methods of cutting existing asphalt pavement, will not be measured but shall be incidental to the pay item for HMA (Patching).

Asphalt sawing or other approved cutting methods shall be incidental to the pay items for Removal of Asphalt Mat or pay items which include removal of asphalt pavement.

REVISION OF SECTION 203

EXCAVATION AND EMBANKMENT

Section 203 of the CDOT Standard Specifications is hereby revised for this project as follows:

In subsection 203.03 delete the fourth and fifth paragraphs and replace with the following:

Embankment imported onto the project will be tested for water soluble sulfates using CP-L 2103 Method B.

The average of three consecutive tests shall show that the sulfate content is not greater than that corresponding to the sulfate exposure level specified on the plans. No single test shall have a sulfate content more than 20 percent greater than that corresponding to the sulfate exposure level specified on the plans.

In subsection 203.03 delete the eighth and ninth paragraphs and replace with the following:

The average of three consecutive tests shall show that the imported material’s sulfate, chloride, pH, and resistivity is not greater than the limits corresponding to the Pipe Class in Table 203-1 or Table 203-2 for the pipe class specified in the Contract. No single test shall have a result more than 20 percent greater than that corresponding to the limit in Table 203-1 or Table 203-2 for sulfates, chlorides, and resistivity. No single test shall have a result more than 5 percent outside the limit in Table 2-301 for pH.

Subsection 203.05 (f) shall include the following:

Potholing consists of locating utilities by removal of pavements, excavation of materials of whatever character required to expose the utilities, replacement and compaction of the excavated material and patching the pavement. The Contractor will coordinate survey activities to document utility locations.

Subsection 203.06 shall include the following:

Contractor shall use material excavated from the project for embankment to the greatest extent possible. The Engineer shall approve excavated material for placement as embankment on the project. Compaction shall be in accordance with AASHTO T99.

Embankment material imported to the site for inclusion in a pavement structure shall have a resistance value of at least 8 at 300 psi exudation pressure as measured by the Hveem Methodology. The Contractor shall submit test results to the Engineer for approval prior to importing embankment material. Earthen material imported to the site for other fill outside the roadway shall be easily compacted, stable material with zero to less than 2% swell/shrinkage potential, when a surcharge load of 200 psf is applied.

Delete subsection 203.09 and replace with the following:

203.09 Earthwork – Rough Grade. Rough grading shall consist of earthwork necessary to achieve the approximate grades when the excavation or embankment depth is less than 12 inches.

Delete subsection 203.10 and replace with the following:

203.10 Earthwork – Fine Grade. Fine grading shall consist of earthwork necessary to achieve the final and sub-grade elevations when the excavation or embankment depth is less than 12 inches.

Delete subsection 203.11 (d) and replace with the following:

(d) Earthwork – Rough Grade and Fine Grade. Earthwork – rough grade and fine grade will be measured as the area in square yards that is graded.

Delete subsection 203.11 (f) and replace with the following:

(f) Proof rolling. Proof rolling will not be measured and paid for separately but shall be included in Section 306.

Subsection 203.12 shall include the following:

Pay Item Pay Unit

Earthwork – Rough Grade Square Yard

Earthwork – Fine Grade Square Yard

REVISION OF SECTION 206

EXCAVATION AND BACKFILL FOR STRUCTURES

Section 206 of the CDOT Standard Specifications is hereby revised for this project as follows:

Add subsection 206.02 (d) as follows:

(d) Squeegee material, when approved for application by the Engineer, shall meet the following gradation:

Sieve Designation Percent by Weight Passing 3/8 inch 100 No. 4 60-90 No. 8 0-45 No. 16 0-25 No. 50 0-6 No. 200 0-2

In subsection 206.03 delete the fourteenth paragraph and replace with the following:

Compaction of structure backfill (flow fill) will not be required except as necessary to ensure complete filling of any voids around structures and pipe.

Subsection 206.03 shall include the following:

Squeegee material shall only be used as bedding for reinforced concrete pipe. Compactive effort shall be used on squeegee material to consolidate the material around the pipe haunches.

Backfill and compaction shall be accomplished immediately upon completion of each item. Open trench length shall not exceed one hundred (100) feet during construction. During non-construction periods (evenings, weekends, and holidays) all trenches shall be backfilled and compacted, excepting an area not exceeding 400 square feet as the daily pipe terminal, and structures not completed or to adequate strength. The Engineer may require backfilling of the pipe terminus if the terminus is located in an intersection or the remaining street width is inadequate to safely convey two-way traffic around the area of the terminus.

Delete subsection 206.06(c) and (d) and replace with the following:

(c) Excavation, bedding, backfill, compaction, disposal of surplus material, haul, water, and all other required work for construction of pipe and structures will not be measured and paid for separately but shall be considered incidental to construction of the pipe and/or structure. Pipe and structures will not be considered for payment until all backfill is completed.

Add subsections 206.06 (d) – (f) as follows:

(d) Structure Backfill (Flow-fill) used at the direction of the Engineer will be measured in accordance with the lesser of that quantity calculated as shown in M-206-1 or the actual quantity used. Structure Backfill (Flow-fill) not required by the Contract Documents may be used at the Contractor's discretion but will not be measured and paid for.

(e) Structure Backfill (Class 1, 2, 3 or Flow-fill) will be paid according to the unit prices on the Bid Schedule only when the excavated material is unacceptable for backfill as determined by the Engineer.

(f) Structure Excavation will be paid according to the unit price on the Bid Schedule only when over-excavation is required for removal of unsuitable material and replacement by Structure Backfill (Class 1, 2, 3, or Flow-fill).

Subsection 206.09 shall include the following:

Bracing, shoring, sheeting, etc., shall be in accordance with all applicable State and Federal Occupational Safety and Health requirements. Shoring shall be removed as the work and backfilling operations progress unless ordered by the Engineer to be left in place.

The decision to brace, shore or sheet the excavation shall be entirely the Contractor's responsibility. However, if the Engineer is of the opinion that at any point the trench walls are not properly supported, he may order the placement of additional supports by and at the expense of the Contractor, and compliance with such order shall not relieve or release the Contractor from his responsibilities for the safety of the work.

REVISION OF SECTION 206

EXCAVATION AND BACKFILL FOR STRUCTURES

Delete subsection 206.10 and replace with the following:

Shoring will not be measured and paid for separately, but shall be considered as incidental to construction and all costs incurred, except for materials ordered to be left in place, and will be considered to be included in the unit price bid for the construction of each section of sewer or associated structure.

Delete subsection 206.11 and replace with the following:

The Contractor will be paid for shoring ordered to be left in place on the basis of invoiced material only.

REVISION OF SECTION 208

EROSION CONTROL

Section 208 of the CDOT Standard Specifications is hereby revised for this project as follows:

In subsection 208.03 change the following references:

All references to “CDOT” to “City.”

All references to “Headquarters” and/or “Region” to “City”.

All references to “The Region Water Pollution Control Manager” to “City Stormwater Coordinator (CSC)”.

All references to “Form 105” to “Stormwater Quality Photo Report”.

All references to “Standard Plans M-208-1, M-216-1, and M-615-1” to “standard details”.

In the first paragraph of subsection 208.03(c) change the reference to “Department” to “CDOT”.

In subsection 208.03(c)1 delete item (I).

In subsection 208.03(c)2(A)(3) delete the last sentence in both paragraphs.

In subsection 208.03(c)2 delete item (F) and replace it with the following:

(F) Document spills, leaks, or overflows that result in the discharge of pollutants in the SWMP notebook.

The ECI shall record the time and date, weather conditions, reasons for spill, and how it was remediated.

In subsection 208.03(d)1 delete item (H) and replace it with the following:

(H) Weekly meeting notes and inspection reports.

In subsection 208.03(d)1 delete item (I) and replace it with the following:

(I) Other reports relating to Water Quality.

In subsection 208.03(d) delete item 2.

In subsection 208.03(e) delete the last sentence of the first paragraph and replace it with the following:

At this meeting, the following shall be discussed and documented in the SWMP notebook.

Add subsection 208.03 (f) as follows:

(f) Stormwater Management Plan & CDPHE Permit

(1) Unless notified in writing to the contrary, the Contractor shall prepare SWMP immediately following City Council Award of the Project. Following Council Award, the City shall provide the Contractor with a Notice of Intent, authorizing the Contractor to begin work on the SWMP while the Project contract documents are being signed. This expedited process is designed to minimize delays to the Project from SWMP preparation and permitting with the Colorado Department of Public Health and Environment

(CDPHE).

(2) The SWMP is required for all projects regardless of whether or not an “Erosion and Sediment Control Plan” is shown in the plans. If provided, the “Erosion and Sediment Control Plan” may be made part of (and modified by) the SWMP document. The City can provide examples of a City approved SWMP document upon request.

(3) When necessary, immediately following written approval of the SWMP, the Contractor shall make application to the CDPHE for a “General Permit Application for Stormwater Discharges Associated with Construction Activity”. The Contractor shall prepare all application materials and pay the application fee. No land disturbance work may proceed until a Stormwater permit has been received by the Contractor, and a copy of same has been provided to the City.

Subsection 208.04 (f) shall include the following:

Any sediment or debris which may have accumulated as a result of construction in any waterway, swale, stormwater detention area, inlet structure, curb, pipe, or any other system of conveyance of water shall be promptly removed by the Contractor to the satisfaction of the Engineer. This includes routine cleaning and

REVISION OF SECTION 208

EROSION CONTROL

maintenance of any BMP that prevents construction sediment from entering a City stormwater collection system or directly into a waterway.

Add subsection 208.05 (u)

(u) Street Sweeping

The Contractor shall make every effort to ensure that sediment and construction debris does not leave the construction site and be deposited on surrounding streets. Recognizing that complete prevention of migrating soil and rock material may not be possible, the City has provided a reasonable allowance for Street Sweeping mobilizations. Each Street Sweeping unit shall consist of one mobilization and a minimum of 2 hours of Street Sweeping with a mechanized wet sweeping device designed to minimize dust while removing all evidence of construction activity from all surrounding streets. The time during each mobilization may be extended by the request of the City, to ensure that all construction debris is removed from existing streets, at no additional cost or pay item charge to the City.

Should the City determine that additional Street Sweeping mobilizations are required during the course of the Project to remove construction debris from the project site or surrounding streets, the City shall notify the Contractor, and the Contractor shall provide these at no additional cost to the City.

All evidence of Construction debris on surrounding streets extending less than 50 feet beyond the Limits of Construction shall be promptly removed by the Contractor by sweeping at the end of each working day, at no additional cost to the City. Significant evidence of Construction debris extending beyond fifty (50) feet from the Limits of Construction shall be removed by the Contractor at the end of each work week, or the last working day before a weekend or holiday, whichever comes sooner. To perform this removal, the Contractor may utilize a Street Sweeping pay item, or remove the debris via conventional sweeping (in a manner to control dust), at no additional cost to the City. Once the Contractor has exhausted his Street Sweeping pay item quantity, the Contractor shall regularly remove (per the requirements of this Section) Construction debris via Street Sweeping or other sweeping method designed to minimize dust (pressure washing or use of only water for purposes of cleaning is not acceptable) to the end of Construction Activity at no additional cost to the City.

In subsection 208.09 delete the second sentence of the first paragraph.

In subsection 208.09(b) delete the first and second sentence of the third paragraph.

In subsection 208.09(e) delete item 4.

In subsection 208.10 delete item (b).

REVISION OF SECTION 211

DEWATERING

Section 211 is hereby added to the Standard Specifications for this project as follows:

DESCRIPTION

211.01 This work consists of the proper treatment and disposal of ground water collected from dewatering operations during excavation activities.

MATERIALS

211.02 The Contractor shall determine where and when dewatering of work will be necessary to maintain trenches and slopes to facilitate construction as shown on the plans.

CONSTRUCTION REQUIREMENTS

211.03 The Contractor shall submit a Dewatering Plan to the Engineer at least 4 weeks prior to the proposed start of dewatering operations. This Plan shall detail the Contractors method of dewatering for all major excavations. The Dewatering Plan shall be stamped “Approved for Construction” and signed by the Contractor.

The Dewatering Plan will not be approved by the Engineer. The Dewatering Plan shall provide complete details of the Contractor’s method for construction dewatering including:

(a) Copies of all permits required for dewatering, treatment of and (or) disposing of water.

(b) Method and details for minimizing dewatering in excavations and during installation of storm sewer.

(c) Method of measuring groundwater discharge.

(d) Equipment descriptions including size, number, type, capacity, and location of equipment during dewatering operations.

(e) Detailed methods for disposal of water.

(f) If applicable, copies of agreements for disposing of water in storm sewers, sanitary sewers etc.

The Contractor shall review Section 250 for additional requirements for disposal of water.

METHOD OF MEASUREMENT

211.04 Dewatering will not be measured but will be paid for as a single lump sum.

BASIS OF PAYMENT

211.05 The accepted quantities, measured as provided above, will be paid for at the contract price for each of the pay items listed below that appear in the bid schedule.

Payment will be made under:

Pay Item Pay Unit

Dewatering Lump Sum

REVISION OF SECTION 213

MULCHING

Section 213 of the CDOT Standard Specifications is hereby revised for this project as follows:

Delete subsection 213.02 (e) and replace with the following:

(e) Metal Landscape Border. Metal landscape border shall be standard, 4" x 3/16", ASTM A569, rolled edge, fabricated in sections with loops stamped or welded to the face 30 inches apart to receive stakes. Provide factory painted steel with tempered steel stakes.

Add subsection 213.02 (h) and (i) as follows:

(1) Landscape Rock (2”). Landscape rock shall consist of ¾" – 1 ½" crushed rock designed for landscape applications.

(2) Landscape Rock (Cobble). Landscape rock (cobble) shall consist of 3-inch nominal size cobble used for landscape applications.

Delete subsection 213.03 (f) and replace with the following:

(f) Metal Landscape Border. Metal landscape border shall be installed along the lines and at the grades shown on the plans in accordance with the manufacturer’s instruction. Ends of metal landscape border shall overlap the next adjacent section a minimum of 6 inches. Metal landscape border shall be anchored with factory painted steel stakes at intervals of approximately 30 inches. Metal landscape border shall be inserted into the ground by driving against the steel stakes; ground may be moistened to ease entrance into the ground. Driving on edge of metal landscape border will not be permitted except when the edge is properly shielded. Metal landscape border may be bent for sharp angles and overlapped at closure of perimeter. Install metal landscape border before landscape rock or mulch placement.

Add subsection 213.03 (i) as follows:

(i) Landscape Rock. Landscape rock shall include all necessary work and materials to place landscape fabric and 3-inch thickness of landscape rock within metal landscape border as shown on the plans or as directed by the Engineer.

In subsections 213.04 and 213.05, change all references to “acres” to “yards”.

In subsection 213.04, add “landscape rock” to the items listed in the first sentence.

In subsection 213.05, add the following pay items:

Landscape Rock (2") Square Yard

SECTION 218

WATER DIVERSION MANAGEMENT PLAN

Section 208 of the CDOT Standard Specifications is hereby added for this project as follows:

218.01 The Contractor shall divert existing flows from pipes to be replaced in a safe and efficient manner throughout the construction and acceptance of the new pipes. This includes the perforated pipe running from north to south through the hillside parallel.

218.02 The flow rate of the pipe is unknown. The perforated pipe collects groundwater from the hillside and conveys it south to an manhole in I-70 Frontage Road. The manhole typically shows a minimal inflow from the pipe, though it is believed that it is currently blocked.

The bypass pumping system for the pipe must be operation for the duration of Contractor work to replace the associated pipe. It is anticipated that the pipe replacement can be completed in 2 weeks, but it is the Contractor’s responsibility to determine this duration.

The bypass pumping system shall have a minimal effect on the day-to-day operations of the adjacent businesses. Any pipes or hoses laid across drive lanes will require a pipe and utility crossing “bridge” suitable to maintain vehicular access, including delivery trucks, to the business park.

MATERIALS

218.02 Materials used to execute bypass pumping shall be determined by the Contractor.

CONSTRUCTION REQUIREMENTS

218.03 The Contractor is to prepare a written “Water Diversion Management Plan” describing their approach to be reviewed by the City and the business park prior to beginning any work on the storm pipe. The Water Diversion Management Plan shall include:

(a) Description of the means and methods the Contractor intends to use to accomplish bypassing water in the pipe until the time the new pipe is connected and accepted. This shall include the details for the line plug including materials, installation, and removal.

(b) Identification and description of the bypass contingency system means and methods with verification that its capacity is adequate to transfer the flow for the duration specified.

(c) A written, detailed “Emergency Response Plan” identifying how the Contractor will respond, what actions will be taken, within what timeframe, clean-up and restoration plan, and communication plan should – for whatever reasons – water escape the work zone. The plan must acknowledge that the Contractor is solely responsible for any and all clean up and/or remediation costs and damages that ensue from a failure of the Contractor to protect the water diversion during construction and contain the water within the storm line or manholes.

The Water Diversion Management Plan must be submitted to the City for review at least 30 calendar days prior to the Contractor commencing work on or around the storm line. The City and the business park must review and accept the Contractor’s Water Diversion Management Plan prior to the Contractor beginning any work on the storm replacement.

Review and acceptance of the Water Diversion Management Plan does not alleviate the responsibility of the Contractor to perform the work in a safe, controlled, and clean manner that minimizes impact to the current water flow to the extent possible.

METHOD OF MEASUREMENT

208.04 Bypass Pumping System will not be measured but will be paid for on a lump sum basis. This includes preparation of the Water Diversion Management Plan, preparation of the Emergency Response Plan, execution of pumping system for necessary diversion duration, pumps, pipes, hoses, drivable bridges, restoration of any modified or damaged existing conditions.

BASIS OF PAYMENT

218.05 The basis of payment is Lump Sum for the bid items “Bypass Pumping System - Hillside Perforated Pipe". The lump sum price shall include any and all work required to design, install, operate, maintain, and

SECTION 218

WATER DIVERSION MANAGEMENT PLAN

remove the line plug and the bypass contingency system during construction. It shall include all clean-up work that may be required should drainage escape during construction. It shall also include preparation and submittal of Water Diversion Management Plan as described in this specification.

Bypass Pumping System - Hillside Perforated Pipe LS

REVISION OF SECTION 304

AGGREGATE BASE COURSE

Section 304 of the CDOT Standard Specifications is hereby revised for this project as follows:

Subsection 304.02 shall include the following:

Materials for the base course shall be Aggregate Base Course (Class 6) as shown in subsection 703.03.

The Aggregate Base Course (Class 6) must meet the gradation requirements and have a resistance value (R-value) of at least 78 when tested by the Hveem Stabilometer method.

Reclaimed asphalt pavement (RAP), asphalt millings, or asphalt in any form whatsoever shall not be substituted for or used in Aggregate Base Course (Class 6).

REVISION OF SECTION 401

PLANT MIX PAVEMENTS-GENERAL

Section 401 of the CDOT Standard Specifications is hereby revised for this project as follows:

In subsection 401.02 (a), delete item 3.

In subsection 401.02 (a), delete the second paragraph and replace with the following:

The Contractor shall submit a hot mix design for each mixture required by the contract a minimum of fourteen

(14) days prior to beginning construction.

Mix designs shall be performed in a materials laboratory under the direct supervision of and shall be stamped and signed by a Professional Engineer licensed in Colorado. The design submittal shall include the following information:

(a) Source of materials, including aggregate, asphalt cement and anti-stripping additive.

(b) Gradation, specific gravity, description of individual aggregates and final aggregate blends.

(c) Aggregate physical properties.

(d) Design Job Mix Formula.

(e) Asphalt Cement properties.

(f) Mixing and compaction temperatures.

(g) Mixture properties determined at a minimum of four asphalt contents with graphs showing mixture properties versus asphalt content.

(h) Properties at the optimum asphalt cement content.

(i) Verification tests performed during mix production.

* The optimum percent AC content shall be chosen at 4.0 percent air voids in accordance SP-2.

Mix designs shall be based upon the following traffic loading criteria, unless otherwise specified on the drawings:

Traffic Level (MGPEC designation) I II

EDLA (Equiv. Daily 18 kip Loaded Axle) 0-40 40-410

Street Classification (City designations) Local Collector

Asphalt Cement PG 64-22 PG 64-22

The hot mix asphalt shall be designed in accordance with Colorado Procedure CP-L 5115, “Standard Method for Preparing and Determining the Density of Bituminous Test Specimens by Means of the Gyratory Compactor” for the Superpave Method of Mixture Design.

Additional guidance is provided in “Superpave Level 1 Mix Design” SP-2 published by the Asphalt Institute. Mix designs shall meet the criteria outlined for the applicable method used. Grading SG mixes shall be designed using appropriate 150mm molds for the Superpave method.

In subsection 401.02 (a), delete the third paragraph and replace with the following:

The design job mix formula (JMF) for each mixture shall establish a single percentage of bituminous material to be added to the aggregate, and a single temperature for the mixture at the plant discharge point. The City may test the Contractors proposed JMF for each hot bituminous pavement grading utilizing materials actually produced and stockpiled for use. Contractor shall provide a sufficient quantity of each aggregate, mineral filler, RAP, and additive for the required laboratory tests if requested by the City.

After the JMF is approved, a new JMF shall be submitted to the Engineer if there is a change in the source of materials.

REVISION OF SECTION 401

PLANT MIX PAVEMENTS-GENERAL

In subsection 401.02 (a), delete the fourth and fifth paragraphs.

In subsection 401.06, delete the first paragraph and replace with following:

401.06 Asphalt Cements. Asphalt cement grade PG 64-22 shall be required unless otherwise specified on the drawings.

Subsection 401.07 shall include the following:

Minimum temperature requirements may be waived by the engineer if it is in the best interest of the City.

However, paving operations will be suspended when density requirements are not met.

Delete subsection 401.11 and replace with the following:

401.11 Tack Coat. Prior to patching or placing hot mix asphalt, the exposed sides of bituminous pavement, concrete pavement, concrete structures and concrete curb and gutter to make contact with placed hot mix asphalt shall be thoroughly coated with emulsified asphalt.

Except within the limits of geotextile placement, a tack coat shall be provided for pavement overlay work.

Unless approved by the Engineer, subsequent hot mix asphalt lifts shall not be placed in the same day. A tack coat shall be provided between lifts when they are not placed in the same day.

Grade CSS-1h or SS-1h emulsified asphalt shall be thinned with an equal amount of clean water and the mixture applied at the rate of 0.15 gallons per square yard.

Subsection 401.12 shall include the following:

A pick-up type sweeper shall be used. A power broom type sweeper shall not be allowed.

Subsection 401.16 shall include the following:

Top pavement layers shall not exceed 3 inches in depth.

Subsection 401.19 shall include the following:

If one or more samples of hot mix asphalt (HMA) fail to meet criteria requirements, the Contractor, at his expense, shall cut a minimum of 4 additional cores in the area represented by the failing sample. The City will take possession of the cores and will have the necessary tests performed on each of the sample locations.

Duplicate cores may be taken and retained by the Contractor at the Contractor’s expense. The time which the core samples are taken, the number of cores and their location shall be established by the City. Taking cores and patching the core holes will be performed by the Contractor at his sole expense. The Contractor shall reimburse the City for all expenses related to inspecting, coring, testing, and determining specified limits that the MHA failed to meet.

REVISION OF SECTION 403

HOT MIX ASPHALT

Subsection 403.02 shall include the following:

The design mix for hot mix asphalt shall conform to the following:

Table 403-1

Property Test Method

Value For Grading

SX (75) S (75) Patching

Air Voids, percent at:

N (design)

CPL 5115 3.5 – 4.5 3.5 – 4.5 3.5 – 4.5

Lab Compaction (Revolutions):

N (design)

CPL 5115 75 75 75

Stability, minimum CPL 5106 28 28 28

Aggregate Retained on the 4.75 mm (No. 4) Sieve for S, SX and SG, and on the 2.36mm (No. 8) Sieve for ST and SF with at least 2 Mechanically Induced fractured faces, % minimum*

CP 45 60 60 60

Accelerated Moisture Susceptibility Tensile Strength Ratio (Lottman), minimum

CPL 5109

Method B

80 80 80

Minimum Dry Split Tensile Strength, kPa (psi)

CPL 5109

Method B

205 (30) 205 (30) 205 (30)

Grade of Asphalt Cement, Top Layer PG 64-22 PG 64-22

Grade of Asphalt Cement, Layers below Top PG 64-22 PG 64-22

Voids in the Mineral Aggregate (VMA) % minimum CP 48 See Table

403-2 See Table

403-2 See Table

403-2

Voids Filled with Asphalt (VFA), % AI MS-2 65-80 65-80 65-80

Dust to Asphalt Ratio Fine Gradation Coarse Gradation

CP 50

0.6 – 1.2

0.8 – 1.6

Note: AI MS-2 = Asphalt Institute Manual Series 2 Note: Mixes with gradations having less than 40% passing the 4.75 mm (No. 4) sieve shall be approached with caution because of constructability problems.

Note: Gradations for mixes with a nominal maximum aggregate size of one-inch or larger are considered a coarse gradation if they pass below the maximum density line at the #4 screen.

Gradations for mixes with a nominal maximum aggregate size of 3/4” to 3/8” are considered a coarse gradation if they pass below the maximum density line at the #8 screen.

Gradations for mixes with a nominal maximum aggregate size of #4 or smaller are considered a coarse gradation if they pass below the maximum density line at the #16 screen.

*Fractured face requirements for SF may be waived by RME depending on project conditions.

All mix designs shall be run with a gyratory compaction angle of 1.25 degrees and properties must satisfy Table 403-1. Form 43 will establish construction targets for Asphalt Cement and all mix properties at Air Voids up to

1.0 percent below the mix design optimum. CDOT will establish the production asphalt cement and volumetric targets based on the Contractor’s mix design and the relationships shown between the hot mix asphalt mixture volumetric properties and asphalt cement contents on the Form 429. CDOT may select a different AC content other than the one shown at optimum on the Contractor’s mix design in order to establish the production targets as contained on the Form 43. Historically, Air Voids adjustments typically result in asphalt cement increases from 0.1 to 0.5 percent. Contractors bidding the project should anticipate this change and factor it into their unit price bid.

Table 403-2

Minimum Voids in the Mineral Aggregate (VMA)

Nominal

Maximum Size*, mm (inches)

***Design Air Voids **

3.5% 4.0% 4.5% 5.0%

37.5 (1½) 11.6 11.7 11.8

N/A

25.0 (1) 12.6 12.7 12.8

19.0 (¾) 13.6 13.7 13.8

12.5 (½) 14.6 14.7 14.8

9.5 (⅜) 15.6 15.7 15.8

4.75 (No. 4) 16.6 16.7 16.8 16.9

* The Nominal Maximum Size is defined as one sieve larger than the first sieve to retain more than 10%.

** Interpolate specified VMA values for design air voids between those listed.

*** Extrapolate specified VMA values for production air voids beyond those listed.

The Contractor shall prepare a quality control plan outlining the steps taken to minimize segregation of HMA.

This plan shall be submitted to the Engineer and approved prior to beginning the paving operations. When the Engineer determines that segregation is unacceptable, the paving shall stop and the cause of segregation shall be corrected before paving operations will be allowed to resume.

CDOT approved Warm Mix Asphalt (WMA) may be allowed on this project in accordance with CP 59. WMA mixes shall utilize additives from the CDOT Approved Products List (APL). Unique requirements for WMA design, production and acceptance testing as documented during CDOT WMA approval shall be submitted and approved prior to creation of the Form 43 and before any WMA production on the project. Delays to the project due to WMA submittal and review will be considered within the Contractor’s control and will be non-excusable.

Patching shall be to the depth of the surrounding existing pavement, or as directed by the Engineer. Hot mix asphalt for patching shall conform to the gradation requirements of either HMA (Grading SX) or HMA (Grading S), per the Engineer’s direction.

A minimum of 1 percent hydrated lime by weight of the combined aggregate shall be added to the aggregate for all hot mix asphalt.

In Subsection 403.03, delete the second paragraph and replace with the following:

Areas to be patched back shall be saw cut, unless alternative methods of cutting which produce straight lines and vertical cuts are approved by the Engineer. Limits of cutting shall be as specified on the plans or as directed by the Engineer. Jagged edges are unacceptable and shall be replaced at the Contractors expense.

Prior to placement of the patch, all exposed sides of the existing pavement shall be thoroughly coated with tack. Hot mix asphalt shall then be placed and compacted in succeeding layers not to exceed 4 inches in depth.

All materials excavated from the patch area shall become the property of the Contractor and hauled from the site.

The Contractor shall construct the work such that all roadway pavement placed prior to the time paving operations end for the year, shall be completed to the full thickness required by the plans. The Contractor's Progress Schedule shall show the methods to be used to comply with this requirement.

Delete subsection 403.05 and replace with the following:

403.05 The accepted quantities of hot mix asphalt will be paid for in accordance with subsection 401.22, at the contract unit price per ton for the bituminous mixture.

Payment will be made under:

Pay Item Pay Unit

Hot Mix Asphalt (Grading SX)(75)(PG 64-22) Ton

Hot Mix Asphalt (Grading S)(75)(PG 64-22) Ton

Hot Mix Asphalt (Patching)(Asphalt) Ton

Aggregate, asphalt recycling agent, asphalt cement, additives, hydrated lime, and all other work and materials necessary to complete each hot mix asphalt item will not be paid for separately, but shall be included in the unit price bid. When the pay item includes the PG binder grade, any change to the submitted mix design optimum asphalt cement content to establish production targets on the Form 43 will not be measured and paid for separately, but shall be included in the work. No additional compensation will be considered or paid for any additional asphalt cement, plant modifications and additional personnel required to produce the HMA as a result in a change to the mix design asphalt cement content.

Historically, typical asphalt cement increases reflected on the Form 43 are from 0.1 to 0.5 percent. However, the Contractor should anticipate the AC increases typical of his mixes. Contractors bidding the project should anticipate this change and factor it into their unit price bid.

When the pay item does not include the PG binder grade, asphalt cement will be measured and paid for in accordance with Section 411. Asphalt cement used in Hot Mix Asphalt (Patching) will not be measured and paid for separately, but shall be included in the work.

Excavation, preparation, and tack coat of areas to be patched will not be measured and paid for separately, but shall be included in the work.

REVISION OF SECTION 603

CULVERTS AND SEWERS

Section 603 of the CDOT Standard Specifications is hereby revised for this project as follows:

Subsection 603.01 shall include the following:

Contractor is to clean and camera three pipes entering the manhole in West I-70 Frontage Road (MH 4) as shown on plans. Upon reviewing the pipe video and report for the 12” solid HDPE pipe the City may chose to request the Contractor to make a pipe spot repair or install a cured-in-place pipe (CIPP) lining in the pipe.

CONSTRUCTION REQUIREMENTS

Subsection 603.03 shall include the following:

12” solid HDPE:

This 12” storm drain pipe extending north from MH 4 is believed to be solid HDPE. A camera was run from MH 4 north 35 feet to an impassible obstruction. The Contractor is to clear the obstruction, presumably by excavation from above, and repair the pipe with similar materials. The Contractor is to clean, route, and camera the line from the manhole MH 4 to the next manhole MH 3. Contractor shall provide video and report to City.

Upon reviewing the pipe video and report for the 12” solid HDPE pipe the City may chose to request the Contractor to make a pipe spot repair or install a cured-in-place pipe (CIPP) lining in the pipe.

Add Alternates for spot repairs are included in the Contractor Bid form. If a spot repair is requested, the Contractor will provide the City with an updated estimate of quantities based on the location of the actual defective pipe prior to commencement of work. The City will review and approve the quantities to be paid at the unit prices included in the original Contractor Bid.

4” and 8” HDPE:

These two storm drain pipes extending northwest from MH 4 are believed to be either solid or perforated HDPE. The Contractor is to clean, route, and camera each line from the manhole to the next manhole, cleanout, or capped end, the location of which is unknown. The length shown on plans is the best information available. Contractor shall provide video and report to the City.

METHOD OF MEASUREMENT

Subsection 603.12 shall include the following:

Cleaning, routing, and camera of each line will be measured by the linear feet of each pipe recorded in the video and report.

Cured-in-place pipe (CIPP) lining of line will be measured by the linear feet of pipe.

BASIS OF PAYMENT

Subsection 603.13 shall include the following:

Clean & Camera Pipe Linear Feet

REVISION OF…