Active SLED Opportunity · NEW MEXICO · CITY OF LAS CRUCES
AI Summary
City of Las Cruces seeks general construction services for gas pipeline replacement, micro surfacing, and restoration of sidewalks, driveways, and landscaping. Funded by PHMSA grant, the project requires compliance with federal procurement and Buy America standards. Key tasks include pipeline replacement, traffic control, materials testing, and customer outreach. Bid due May 5, 2026.
The City of Las Cruces (City) is seeking general construction services for gas pipeline and service replacement, micro surfacing restoration, and restoration of sidewalks, drive pads, and landscaping as necessary.
Bid item descriptions and detailed scope of work can be found in the attached contract and bid document listed as Exhibits "A" and "B."
The plans which are made a part of the Contract Documents are described as follows:
Sheet G1 COVER SHEET
Sheet G2 GENERAL NOTES
Sheet C1 KAREN DRIVE ALIGNMENT SHEET 1
Sheet C2 KAREN DRIVE ALIGNMENT SHEET 2
Sheet C3 BROADMOOR DRIVE ALIGNMENT SHEET 1
Sheet C4 BROADMOOR DRIVE ALIGNMENT SHEET 2
Sheet C5 KAREN PLACE ALIGNMENT SHEET
Sheet C6 RONA DRIVE ALIGNMENT SHEET
Sheet C7 GALAXY DRIVE ALIGNMENT SHEET
Sheet C8 SIRIUS STREET ALIGNMENT SHEET
Sheet R1 KAREN DRIVE ROAD REPAIR SHEET 1
Sheet R2 KAREN DRIVE ROAD REPAIR SHEET 2
Sheet R3 BROADMOOR DRIVE ROAD REPAIR SHEET 1
Sheet R4 BROADMOOR DRIVE ROAD REPAIR SHEET 2
Sheet R5 RONA DRIVE ROAD REPAIR SHEET
Sheet R6 GALAXY DRIVE ROAD REPAIR SHEET
Sheet R7 SIRIUS STREET ROAD REPAIR SHEET
Sheet M1 2" PE X 2" PE HOT TAP DETAIL
Sheet M2 2" PE X 2" PE HOT TAP W/ TWO VALVES DETAIL
Sheet G3 STANDARD DETAILS
Sheet G4 STANDARD DETAILS
Sheet G5 STANDARD DETAILS
Sheet T1 TYPICAL TRAFFIC CONTROL DETAILS
Sheet T2 TYPICAL TRAFFIC CONTROL DETAILS
Sheet S1 SURVEY CONTROL MAP
Sheet S2 SURVEY CONTROL MAP
These Special Conditions, together with the accompanying documents and maps listed under SC-1 and the Referenced Specifications listed in these documents, cover the requirements for the work as listed in the bid, including incidental appurtenant work.
The City reserves the right to shorten, add to, or change the list of work given below. It is intended, at this time, that the following work will be accomplished under this contract:
Replacement of approximately 13,600 feet of Acrylonitrile Butadiene Styrene (ABS) gas distribution pipeline with new MDPE pipeline and services. This includes the replacement and potential relocation of meters to meet current safety standards. The project will also include the required traffic control, restoration and other incidental task to complete this replacement project.
This project is to be funded by a grant from the Pipeline and Hazardous Materials Safety Administration (PHMSA) and is subject to federal procurement requirements that includes but not limited to Build America, Buy America (BABA) requirements.
The total contract shall be completed within 60 working days. All work specified in the contract documents and construction drawings shall be completed within the contract time.
A working day is defined as any day when, in the judgment of the project manager, soil and weather conditions are such as would permit work to be performed on the project for six (6) hours or over, unless other conditions beyond the Contractor's control prevent such operations. If conditions are such as to stop work in less than six (6) hours, the day will not be counted as a working day. Saturdays, Sundays, and official holidays as established by the City of Las Cruces will not be charged as working days.
The contract time shall begin on the date noted on the "Notice to Proceed". The project manager will be the judge of the number of working days to be charged under the contract. No allowance will be made for delay or suspension of work due to fault of the Contractor.
In case of dispute the Contractor shall, within 10 calendar days of the day(s) in question, request in writing a judgment of the current working day count and the day(s) in question. The project manager shall respond with a written notice within 10 calendar days as to whether or not the day(s) in question will be counted as working days. Any objection by the Contractor to the number of working days charged shall be made in writing and shall set forth his objections and reasons therefore.
The completion of the work covered by this contract within the time specified is essential to minimize the impact on the public. Therefore, liquidated damages in the amount of two thousand dollars ($2,000.00) per day will be withheld from payments due the Contractor for each working day necessary to complete the contract after the expiration of the specified contract time, plus any authorized time extensions. The liquidated damages are calculated using the New Mexico State Highway and Transportation Department Standard Specifications for Highway and Bridge Construction - Latest edition and supplemental specifications. If the project is unduly delayed due to lack of vigorous prosecution of the part of the Contractor, such lack shall be considered grounds for termination of the contract with the City completing the work, under the provisions of the General Conditions.
The following order of precedence (highest to lowest) shall be followed for this project in case of conflict between the plans and specifications:
State of New Mexico Wage rates are hereby attached as part of this document the decision from the New Mexico Department of Labor and any modifications thereto noted in the contract shall apply. Whenever a difference exists between the minimum wage rates shown under Wage Rate Decision No. DA-26-11145-A from the New Mexico Department of Labor and any modification thereto noted in the contract, the higher wage rate shall govern.
“Due to changes in New Mexico State Law, Specifically Laws 2001, Chapter 68, House Bill 320, as amended, otherwise formally known as the Retainage Act and now known as the Prompt Payment Act, the City will not retain any portion of pay estimates for this project. The City will pay for completed work only as determined by the Project Manager, and the following provisions are included in this contract:
Ten days after certification of completion, any amount remaining due the contractor or subcontractor under the terms of the contract shall be paid upon the presentation of the following:
Endorsements for additional insured coverage and waivers of subrogation must be provided as a condition of this Agreement and shall be noted on the certificate.
As per the provisions incorporated within Section BID-11 of the City’s General Conditions for Construction Contracts 2004 Edition, the scope of work for this project shall be as provided within the contract documents and plans, plus, unforeseen or anticipated additional work incorporating the same specifications that may be identified by the City during the contract period. The successful contractor may extend the awarded unit prices to other such additional work which may be incorporated into and considered within the project scope as change order. The total amount of all change orders issued under the terms of the contract shall not exceed 50% of the initial contract amount.
The City of Las Cruces shall pay for all testing of materials for acceptance. The Contractor will be responsible for the payment for all quality assurance and quality control testing as indicated in the contract. The number, type, and location of tests shall be determined by the Engineer. The Engineer may supplement tests by the approved testing laboratory with his own test for checking of compliance, in which case the Contractor shall furnish a laborer, if required, for assistance.
Welds: The Contractor will provide and pay for the cost of an x-ray testing lab for inspection of the welding on the steel gas line. One hundred percent (100%) of the welds will be x-rayed on high pressure steel gas lines.
Retests: Any required retesting due to failed tests shall be at the expense of the Contractor. These costs will be deducted by the City of Las Cruces, from invoices submitted by the contractor for work completed under this contract.
All new gas lines shall be surveyed as built (GPS’s in the trench) by the City of Las Cruces, Gas Locating & Mapping Section prior to any backfilling. The coordination of this survey will be through the Public Works Department Gas Inspector assigned to the project. A 30 minute minimum notice will be given to Gas Locating and Mapping Section prior to the contractor having the pipe in place and ready to be GPS. This minimum notice will expedite GPS task. The Gas Inspector will contact the Damage Prevention Dispatcher @ (575) 528-3573. Any work performed in coordinating this effort shall be incidental to the pipeline & appurtenance installation activity.
The contractor and sub-contractors will need to follow the New Mexico Excavation Law. The contractor and sub-contractor should be aware of all recent changes to the law regarding the wide area locates.
The contractor shall video the entire project site prior to start of construction. The contractor will provide a Compact Disk (CD) copy of the video to the City of Las Cruces for approval prior to construction. Cost shall be considered incidental to the contract.
Contractor shall be responsible for providing all equipment, materials, and certified gas welders to complete all steel welds, poly welds, and welds for dissimilar materials. All gas welders shall be certified per the City of Las Cruces Utility Standards, Latest Edition, Section 400-423, Qualification of and Procedures for Polyethylene Welders, and Section 400-424, Contractor Requirements for Steel Welding and Steel Welding Certification.
The contractor will need to adhere to all gas SOPs when working on high pressure, transmission, or low-pressure gas lines. The SOPs can be found at the following link: http://www.las-cruces.org/departments/utilities/natural-gas/resources
Customer Service is an essential component of City of Las Cruces and its representatives. Therefore, the following conditions will be required by the contractor. Any associated cost shall be considered incidental to construction.
EMERGENCY CONTACT
The Contractor shall provide a 24-hour, 7 day a week contact to the City’s Project Manager for residents, businesses, or the City in an event of an emergency. This information shall be placed on all door hanger notices provided to the public along with the City Project Manager’s contact information. All door hanger notices shall be reviewed and approved by the City’s Project Manager prior to distribution.
PUBLIC NOTIFICATION
The Contractor must coordinate/schedule with residents, businesses, and the City where applicable. The Contractor shall distribute flyers/door hangers to all potentially affected residents and/or businesses for each applicable bullet below. At minimum, the flyers/door hangers must include the scope of work, duration of construction activities, and emergency contact as noted above.
RESIDENT/BUSINESS ACCESS
Any access restrictions that affect residents and/or businesses shall be coordinated and approved by the City’s Project Manager at least 48 hours in advance. The access must also be safe for pedestrians (i.e. a safe route must be maintained for residents to access their mailboxes). This shall also include maintaining resident and/or business access and coordinating driveway reconstruction to off-business hours or during resident preference. Additional specific signage for business access shall also be considered incidental to this special condition.
ROAD CLOSURE NOTICE
The Contractor shall inform the City Project Manager a minimum of 72 hours prior to closing or diverting traffic on each roadway. All road closures and traffic control plans must be approved by the City’s Project Manager.
TRASH/RECYCLE PICKUP
Access must be maintained for the solid waste trucks to meet their weekly scheduled route. If the nature of the work is such that it restricts solid waste’s schedule, the Contractor must make arrangements to move the containers to an accessible location. The empty containers are then to be relocated back to the correct property. This must be coordinated 48 hours in advance with solid waste customers.
LANDSCAPE CORRECTION AND SITE CLEANUP
The Contractor shall maintain a clean worksite including work on private property. In addition, the Contractor shall make all corrections to landscape and site damage withing 48 hours of conducting the work. If correction cannot take place within 48 hours, the contractor shall notify the resident and/or business and the City with a schedule of when the correction will take place.
VARIOUS COORDINATION
The Contractor will be responsible for coordinating access with any other relevant entities such as the LCPS busses, Roadrunner Transit, scheduled deliveries, scheduled resident and/or business services, Emergency Services, etc.
The contractor shall ensure all materials installed have been certified for the Buy America or have prior written permission from the City prior to purchase. Contractor shall provide an inventory of all products to be installed and a BABA certification from the manufactured for each product as outlined in 49 U.S.C. 5323(j)(1), and the applicable regulations in 49 CFR part 661 at least 2 weeks prior to installation. A copy of a certification letter is included below for reference.
The descriptions above have specified BABA complaint materials from the standard materials. Additionally, the following materials have been specified as BABA Complaint for each of the 2023 CITY OF LAS CRUCES UTILITY STANDARDS Materials in Section 300. Contractor shall verify all finding below prior to acquisition.
The contractor shall submit a copy of an approved concrete mix design to be used on City projects. The approved copy of the mix design can be obtained from a concrete supplier. The concrete supplier should have in his file a copy of a City approved mix design to be used on City projects.
The submitted mix design must be an original (no photocopies) and embossed with the seal of and signed by, the New Mexico Professional Engineer certifying the mix design.
The pre-approved copy of the mix design will be cross checked against the copy that the supplier previously submitted, to ensure that they match and it is the current approved mix design.
No concrete shall be placed on this project until the Project Manager has approved the concrete mix design.
355.00 GENERAL
This section covers the patching of asphalt pavements and shall consist of preparation of the patch area, placing and finishing and compacting with approved construction materials in compliance with this specification. This specification is intended as a minimum guideline for construction of patches to City Streets and shall be followed unless otherwise specified by the Engineer or Project Manager.
355.10 MATERIALS
355.20 TIMELINESS OF PATCHING
If a patch is on any street other than a low volume residential street OR if a temporary patch is expected to be left for a period of time exceeding three days OR if a cut pavement is not safe for pedestrians and traffic to be left as a base or soil patch, the temporary patch material shall conform to Section 320, COLD MIXED ASPHALT of Standard Specification for Road Construction.
If the patch is on a residential low volume street and will be permanently patched within a reasonable period of time as determined by the Engineer, then the patch material shall be an approved backfill material as directed by the Engineer.
355.30 EQUIPMENT
Equipment, tools, and machines used in the performance of the work covered by this section of the specifications shall be subject to the approval of the Engineer and shall be maintained in a satisfactory working condition at all times. All equipment proposed to be used for work under this section shall be of sufficient size and in such mechanical condition to be capable of completing the work and producing a good quality patch.
355.40 WEATHER LIMITATIONS
355.50 PATCH PREPARATION
355.60 PLACEMENT OF PERMANENT PATCHING MATERIALS
355.70 COMPACTION
355.72 CONTRACTOR QUALITY CONTROL FOR COMPACTION
The Contractor, at their own expense, shall monitor the compaction process by determining the density of the HMAC with a portable nuclear density device in conformity with ASTM D 2950. The contractor may opt out of doing their own independent testing with the understanding that they will accept the density results obtained by the City’s lab for all payment and acceptance purposes. Should the Contractor feel that the test results are erroneous in any way, they may at their time and expense coordinate directly with the testing lab to verify the labs results.
Calibration of the portable nuclear device used by the Contractor shall be established from cut pavement samples (6” cores). The density readings of the cut pavement samples shall be determined by the Contractor in accordance with AASHTO T 166 (weight, volume method) and the density readings of the pavement shall be determined by the portable nuclear density test device in conformity with ASTM D 2950 and shall be correlated by the Contractor. A minimum of three cut pavement samples shall be used to determine the correction factor to be applied to the nuclear density readings to match the unit weight of the cut pavement samples. The Contractor shall conduct density testing at the minimum rate of one per 100 Sq. Yds. and shall furnish results to the project manager within one business day.
It is intended that quality control density testing be done while the bituminous mixture is hot enough to permit further compaction if necessary. Rolling for any compactive effort will not be allowed beyond the point at which it becomes ineffective or damage begins to occur. Additionally, use of vibratory mode will not be permitted when the temperature of the mix is below 200ºF.
355.75 CITY QUALITY ASSURANCE TESTING FOR COMPACTION
The bituminous pavement structure course shall be divided into acceptance sections or lot of 250 Sq. Yds. or one day’s production, whichever is less, for the purpose of defining areas represented by each series of tests. The City shall use a stratified random sampling plan to enhance the quality of acceptance sampling and testing.
The density of each acceptance section or lot will be evaluated by a minimum of three density tests with a portable nuclear density device in conformity with ASTM D 2950. The density readings shall be adjusted using the following calibration process.
Calibration of the portable nuclear device used by the City shall be established from cut pavement samples (6” cores). The density readings of the cut pavement samples shall be determined by the City in accordance with AASHTO T 166 (weight, volume method) and the density readings of the pavement shall be determined by the portable nuclear density test device in conformity with ASTM D 2950. A minimum of three cut pavement samples shall be used to determine the correction factor to be applied to the nuclear density readings to match the unit weight of the cut pavement samples. Once a nuclear device has been calibrated by a minimum of three cut pavement samples (6” cores) the device will be approved for use on the project and no further calibration will be require unless HMAC from a different source or a new mix design from the same source is used. If material from a different source is used any nuclear device used on the project will need to be re-calibrated.
All portable nuclear devices shall be calibrated or they will not be allowed for use on the project.
355.86 PRICE ADJUSTMENT FOR DENSITY (CONTRACTED PROJECTS)
The payment of the unit price will be adjusted for density as outlined in Table 355.86. The adjustment will be applied to a lot or by lot bases for each lift. The adjustment will be based on the average of all density tests for the lot the price adjustment will be applied only to the pay item for HMAC.
TABLE 355.86
PERCENT OF MAXIMUM THEORETICAL DENSITY | PERCENT OF CONTRACT PRICE TO BE PAID |
Above 98 | * |
97-98.00 | 90% |
96.01-96.99 | 95% |
93.00-96.00 | 100% |
92-92.99 | 95% |
91-91.99 | 90% |
90-90.99 | 80% |
Less than 90.00 | * |
*This lot shall be removed and replaced. In lieu thereof, the contractor and the Public Works Director may agree in writing that it is in the best interest of the City that the lot not be removed but instead be paid for at 50% of the contract price.
If the pavement is constructed in conjunction with any other development such as part of a private development (Subdivision), failing densities shall be remedied as directed by the Director of Public Works.
355.90 JOINTS
All joints shall conform to Section 326.87, HOT MIX ASPHALTIC CONCRETE of the Special Conditions.
355.95 SMOOTHNESS
The surface of the pavement after compaction shall match the adjoining pavement in a transverse direction. When tested with a 10' straight edge placed in any direction, the surface shall not vary more than 3/16 of an inch between any two contacts with the surface. When the width of the patch is less than 10’ the surface shall not vary more than 3/16 of an inch between any two contacts with the surface between the joints. Transverse and longitudinal joints shall also be checked for smoothness. Joints shall not vary from the edge of a straight edge placed perpendicular to the joint by more than 3/16 of an inch.
Isolated Patches: Isolated patches are defined as those having less than 15 sq. yds. Isolated patches shall be measured for smoothness at a minimum of 3 locations to be determined by the project manager. Larger isolated patches may be measured every 10 feet at a minimum, and measurements may be taken more frequently at the Project Managers discretion.
Isolated patches that have more than 15% of the measurements not in compliance shall be replaced in full unless otherwise approved by the Project Manager.
Continuous Patches: Continuous patches are those patches greater than 15 sq. yds. and are typically associated with utility trenching. Paved areas with widths of 8 feet or greater and larger than 400 sq. yds. shall not be considered patches and shall be required to comply with Section 326. HOT MIX ASPHALTIC CONCRETE of the special conditions.
Continuous Patches shall be measured at a minimum of every 20 feet. Smaller increments or additional measurements may be taken at the Project Managers discretion. Patches or patch sections that have more than 15% of the measurements not in compliance may be corrected using diamond grinding or mill and overlay. If these methods cannot bring the patch into compliance, it shall be removed and replaced.
In the case that a lot contains less than 15 percent (15%) exceeding 3/16 inch when evaluated with a 10 straight edge but contains any area that exceeds 5/16 inch, the area that exceeds 5/16 inch shall receive diamond grinding at the Contractor’s expense. Any areas that require diamond grinding shall receive a fog seal application also at the Contractor’s expense. Diamond grinding will not be permitted on existing surfaces to bring the new patch into compliance. In these areas the patch shall be replaced.
The Contractor shall have a 10 foot straight edge available at all times during paving operations and when requested by the City for evaluation of completed work. Providing the straight edge shall be considered incidental to construction.
355.96 PROTECTION OF PAVEMENT
After final rolling, no vehicular traffic shall be permitted on the pavement until it has sufficiently cooled and hardened as determined by the Project Manager.
355.97 CLEANING
The Contractor shall, as directed by the Project Manager, remove at his/her own expense from the Owner's property and from all public and private property, all temporary structures, rubbish, debris, or any waste materials resulting from his/her operations. He/she shall leave the entire site in a neat condition as required by the Engineer or Project Manager.
END OF SPECIAL CONDITION 19
The following Section 326 Hot Mix Asphaltic Concrete specification shall replace sections 120.20 through 120.22, section 325 and section 340 of the City of Las Cruces Standard Specifications for Road Construction, 2000 Edition.
SECTION 326 Revised 7-27-12
HOT MIX ASPHALTIC CONCRETE
326.00 GENERAL
This section outlines the requirements for the production of plant mixed hot mix asphalt concrete (HMAC) and placement of one (1) or more layers of hot mix asphalt concrete surface course materials on a prepared base or bituminous surface. Work will consist of the production and placement of HMAC and includes Contractor Quality Control Testing.
HMAC shall be composed of a mixture of bituminous material, aggregate, blending sand, mineral filler, hydrated lime, or liquid anti-strip if required. The aggregate fractions shall be sized and uniformly graded and combined in such proportions as directed by the City.
The type of HMAC and grade of asphalt shall be specified in the contract.
326.05 MATERIALS
All materials shall be tested in accordance with the applicable AASHTO methods or other test procedures designated in the contract. Material that is improperly graded or segregated, or fails to meet the requirements herein, shall be corrected or removed and disposed of immediately as directed by the City Project Manager, at the Contractor’s expense.
326.10 AGGREGATES
TABLE 326.10
ASPHALT CONCRETE AGGREGATE | |
Sieve Analysis of Fine and Coarse Aggregate | AASHTO T-27 (ASTM C-136) |
Mechanical Analysis of Extracted Aggregate | AASHTO T-30 |
Amount of Material Finer than No. 200 Sieve | AASHTO T-11 (ASTM C-117) |
Liquid Limit | AASHTO T-89 (ASTM D4319) |
Plastic Limit and Plasticity Index | AASHTO T-90 (ASTM D4318) |
Resistance to Abrasion of Small Size Coarse Aggregate by Use of the Los Angeles Machine | AASHTO T-96 (ASTM C-131) |
Sampling Bituminous Paving Mixtures | AASHTO T-168 (ASTM D-979) |
Sampling of Aggregates for Paving Mixtures | AASHTO T-2 (ASTM D-75) |
Soundness of Aggregate by Use of Magnesium Sulfate | AASHTO T-104 (ASTM C-88) |
Standard Specification for Coarse Aggregate for Bituminous Paving Mixtures *(See Fractured Faces notes below) | ASTM D-692 |
Determining the Percentage of Fractured Particles in Course Aggregate | ASTM D-5821-01 |
Quantitative Extraction of Bitumen from Bituminous Paving Mixtures | AASHTO T-164 (ASTM D-2172) |
Bulk Specific Gravity and Density of Compacted Bituminous Mixtures Using Saturated Surface-Dry Specimens | AASHTO T-166 (ASTM D-2726) |
Resistance to Plastic Flow of Bituminous Mixtures Using Marshall Apparatus. | AASHTO T-245 (ASTM D-1559) |
Theoretical Maximum Specific Gravity and Density of Bituminous Paving Mixtures | AASHTO T-209 (ASTM D-2041) |
Percent Air Voids in Compacted Dense and Open Bituminous Paving Mixtures | AASHTO T-269 (ASTM D-3203) |
TABLE 326.15
ASPHALT CONCRETE AGGREGATE GRADATIONS | |||
Sieve Size | A | B | C |
1" | 100 |
|
|
3/4" | 80-98 | 100 |
|
1/2" | 65-85 | 80-98 | 100 |
3/8" | 55-75 | 70-90 | 70-98 |
No. 4 | 40-55 | 50-65 | 45-70 |
No. 10 | 30-40 | 32-45 | 30-50 |
No. 40 | 10-20 | 10-22 | 15-25 |
No. 200 | 3-7 | 3-8 | 4-8 |
326.11 ADDITIVES
326.20 PRODUCTION
326.21 COMBINING
When the crushed materials form the stockpiles are combined, the product of such combination shall meet the gradation requirements. In order to meet the specified mix design criteria, blending sand may be added up to a maximum of twenty percent (20%). The actual percentage will be determined based on tests performed by the mix designer. The Contractor shall furnish blending sand from whatever source necessary to meet mix design gradation requirements. The City reserves the right to disapprove any source of blending sand. The blending sand shall be approved based on the mix design approved by the City. Controlled feeders from each stockpile shall be used to blend the materials.
326.22 ACCEPTANCE OF AGGREGATE
The Liquid Limit, Plastic Index, Sand Equivalent and Fractured Face Count of the HMAC aggregate will be determined from representative samples taken after the aggregate materials have been blended and prior to mixing with bituminous material. The test results from these samples will be the basis for acceptance of such aggregate. The City Project Manager may sample and test the aggregate at any time during production or stockpiling.
326.25 BITUMINOUS MATERIALS
Refinery certificates shall be furnished with each shipment of bituminous material and each shipment shall be identified by seal numbers assigned at the refinery.
326.30 JOB‑MIX FORMULA
The job‑mix formula, with the allowable tolerances, shall be within the master range specified for the specified type of asphalt concrete. The job‑mix formula for each mixture shall be in effect until modified in writing by the Engineer. The job‑mix formula for each mixture shall establish a single percentage of aggregate passing each required sieve size, a single percentage of bituminous material to be added to the aggregate. The minimum acceptable retained strength during design when the mix is tested in accordance with AASHTO T-165 shall be +85% at 7% ± 1% air voids. The percent Air Voids, Voids in Mineral Aggregate and other properties of the asphalt mix design shall be designed in accordance with the Asphalt Institute MS-2 Manual recommendations. The job mix formula must provide air voids at ±0.5% of the midpoint of the required Air Voids. After the job‑mix formula is established, all mixtures for the project shall conform thereto within the following ranges of tolerances:
Passing No. 4 and larger sieves | ± 7 percent |
Passing No. 10 and No. 40 sieves | ± 4 percent |
Passing No. 200 sieve | ± 2 percent |
Asphalt Content (Extraction method ASTM D 2172) | ± 0.3 percent |
Mixing Temperature | ± 25° F |
Placing Temperature (ASTM D 2172) | ± 15° F |
Hydrated Lime (when required) | ± 0.3 percent |
Stability (Marshall 75 Blows) | 1800 lbs. plus |
Flow (Marshall) | 16 or lower |
Sand Equivalent | 45 Min. |
Percent Air Voids | 3 ‑ 6 (Collectors/Arterials) |
2 - 4 (Residential streets) | |
Voids in Mineral Aggregate | MS-2 Recommendations |
Immersion ‑ Compression (AASHTO T165) | 85% |
Should a change in source of materials be made, a new job‑mix formula shall be established before the new material is used. When unsatisfactory results are obtained, or the supplier cannot remain within the job‑mix formula band as determined by the job‑mix formula, the City of Las Cruces may require the supplier to cease operation until such corrective action is taken to remain within the job‑mix formula band. The supplier shall furnish printed tickets with each load showing the weight of aggregates and weight of asphaltic material. The supplier shall furnish a current certification showing that the plant scales have been checked for accuracy when requested by the Engineer or Project Manager. In the event a change is made to the job mix formula, a revised original mix design must be submitted to the Project Manager or Engineer for acceptance.
326.31 ANNUAL MIX DESIGN
The Contractor shall submit an asphalt mix design to the project manager for approval. No asphalt shall be placed on any project until the Project Manager has approved the asphalt mix design.
The submitted mix design must be original (no photocopies) and embossed with the seal of, and signed by, the Professional Engineer certifying the mix design. The mix design shall be done in accordance with the recommendations of the latest Asphalt Institute MS-2 Manual. The submitted mix design shall include sufficient information to determine the suitability of the proposed mix design.
The mix design proposal shall contain, as a minimum, the following:
A mix design shall be valid for a period of one year from its original approval by the City.
If the Supplier has an existing City of Las Cruces approved mix design on file, the Contractor shall submit the mix design for verification.
326.32 QUALITY ASSURANCE OF STOCKPILED MATERIALS
Before mix is approved to be delivered to a project, the Contractor shall submit Quality Assurance/Quality Control test results of aggregate produced during the current approval period of the mix design.
326.35 MIXING
The bituminous mixture shall be produced in an approved plant as hereinbefore specified.
326.40 TRANSPORTATION OF BITUMINOUS MIXTURES
326.41 INSPECTION OF PLANT AND EQUIPMENT
The Project Manager and his Inspector shall have access at all times to all parts of the paving plant for checking the adequacy of the equipment in use, inspecting the operation of the plant, verification of weights, proportions, and character of materials, as well as checking temperature control being maintained in the preparation of the asphalt materials.
326.45 TYPE OF HMAC AND GRADING OF ASPHALT CEMENT
The Type of HMAC material shall be designated in the contract and plans. For general purposes the following types of materials and grading of asphalt cement shall be used for application to various roadway types (Locations) unless otherwise specified on the plans or by the Engineer.
LOCATION | ASPHALT CEMENT TYPE | AGGREGATE GRADING |
PAVING OF RESIDENTIAL STREETS | PERFORMANCE-GRADED ASPHALT BINDER | TYPE B |
PAVING OF COLLECTOR STREETS | PERFORMANCE-GRADED ASPHALT BINDER | TYPE B |
PAVING OF ARTERIAL STREETS | PERFORMANCE-GRADED ASPHALT BINDER | TYPE A |
326.50 PLACEMENT EQUIPMENT
Equipment, tools, and machines used in the performance of the work covered by this section of the specifications shall be subject to the approval of the Engineer or Project Manager and shall be maintained in a satisfactory working condition at all times. All equipment proposed to be used for work under this section shall be of sufficient size and in such mechanical condition to be capable of completing the work and producing a good quality pavement.
326.51 WEATHER LIMITATIONS
Asphalt concrete shall not be placed on any wet surface; when the surface temperature is below fifty (50) degrees F; when the chill factor is below forty-five (45) degrees F (chill factor is defined as the ambient temperature in degrees F minus the wind velocity in MPH); or when weather conditions otherwise prevent the proper handling or finishing of the bituminous mixtures. The wind velocity shall be the velocity in MPH determined by the average of the maximum and minimum wind velocity observed in any three (3) minute period immediately prior to or concurrent with ongoing HMA placement operations taken at five feet (5') above the surface of the road.
326.55 PLACING
Prior to transporting the surface course mix to the jobsite, a sand equivalent sample will be taken from the hot plant/pugmill by the City testing lab. The sand equivalent shall be no less than forty-five (45). Prior to laying the surface course, the underlying course shall be cleaned of all foreign or objectionable matter with vacuum-equipped power brooms, or hand brooms. The surface course shall be placed on a prepared base or bituminous surface with an approved prime coat or tack coat conforming to Sections 300 and 305 of these Standard Specifications, or as indicated on the plans and as directed by the Engineer or Project Manager. During the application of prime and tack coats, care shall be taken to prevent splattering on adjacent pavement, curb and gutter, and structures. Any material inadvertently splattered shall be promptly removed by suitable means.
The minimum thickness of the compacted surface course shall be two inches (2") unless otherwise specified on the plans or specifications. The contractor shall be responsible for monitoring the thickness of the pavement and ensure the material placed is evenly spread on the roadway to a depth that after rolling will be of the specified cross section and grade specified.
Material application shall cease if the wind velocity exceeds twenty-five (25) MPH. The wind velocity shall be the velocity in miles per hour determined by the Projects Inspector by averaging the maximum and minimum wind velocity observed in any three (3) minute period prior to or concurrent to ongoing operations. The wind velocity shall be measured three feet above the roadway surface.
326.56 TEST SECTION
Prior to full production, the Contractor shall prepare and place a quantity of HMAC according to the job mix formula. The amount of mixture should be sufficient to construct a test section 500 feet long by 12 feet wide. Quality control testing shall be performed by the Contractor and City to verify that the mix meets the requirements of the specifications. Full production will not commence until the test results are in compliance as specified by the Project Manager. Additional test sections will be performed until the desired results are obtained. The test sections can remain on the project as determined by the Project Manager.
326.60 CONTRACTOR QUALITY CONTROL FOR MATERIALS
The Contractor is responsible for the quality of materials and construction. The City reserves the right to obtain samples of any portion of any material at any point of the operation for the City’s use. The Contractor shall implement a quality control and operations plan that shall effectively monitor the operations and provide the City with timely notice of conditions adverse to the continuous and uniform production of an acceptable product. At the preconstruction conference, the Contractor shall submit the name of the Quality Control Representative to the Project Manager. The Contractor shall, at that time, submit a quality control and operation plan, including the procedures to be followed in developing, applying, and updating the quality control charts, to the Project Manager for approval. This plan shall follow the requirements outlined by the City. The Contractor shall sample the stockpiled aggregate at a point agreed to by the Project Manager and the mixed material behind the laydown machine and shall conduct testing on those samples in accordance with applicable test procedures. Qualified testing personnel using equipment furnished by the Contractor that meets all applicable ASTM and AASHTO requirements shall accomplish this sampling and testing. The Contractor shall establish a laboratory on the project separate and distinct from the City’s Laboratory and quality assurance facilities. The Contractor shall submit verification that all of the Contractor’s equipment meets the applicable standards. Equipment that does not meet the applicable standards shall be removed from the project. Testing for quality control shall be performed under the direct supervision the Project Manager or his designee. The certification will be based on demonstration of abilities for test methods and procedures, and a written test.
Using these test procedures, the Contractor’s Quality Control Testing shall consist of the following as a minimum:
The Contractor on the project shall control the aggregate gradations during production of HMAC such that the maximum variation from the approved job mix formula, using a moving average of three tests, shall comply with the established tolerances of Table 326.60.
TABLE 326.60
AGGREGATE VARIATION ALLOWANCE
Sieve Size | Percent Tolerance |
Nominal Maximum Sieve, (3/8 in.), and (# 4) | ± 7 |
(No. 10) and No. 40 | ± 4.0 |
(No. 200) | ± 2.0 |
Note: The “Nominal Maximum Sieve” is defined as the sieve size that is one sieve size above the first sieve that has a minimum of 10 percent retained.
If the Contractor’s production testing indicates that this requirement is not being met, the Contractor shall take corrective action to ensure that the requirement is complied with.
326.65 CITY QUALITY ASSURANCE TESTING FOR HMAC MIX
Acceptance will be based on tests made from representative samples taken after the HMAC has been placed on the roadbed and prior to compacting. After the mix design has been issued, the Contractor shall control the mixture production on the project such that the job mix tolerances of Section 326.30 are met.
A battery of tests shall be performed on the HMAC material at a rate of one per 250 tons of mix or a minimum of one battery of test per site or a minimum of two per day.
A battery of tests shall consist of Asphalt Extraction, Gradation of Aggregates, Marshal Stability, Marshal Flow, Percent Air Voids in Compacted Mix, Theoretical Maximum Unit Weight of HMAC Mixture, and Fractured Face Count.
A minimum of one cold feed gradation and Sand Equivalent determination shall be performed per days run.
326.66 ASPHALT FAILURE RESOLUTION PROCEDURES
If the test results for the job mix formula requirements indicate that the material fails to meet the specification tolerances for a period of one day or one lot, the Contractor shall initiate corrective action. A field notice will be issued by the Project Manager with the results of the tests. If the material continues to fail to meet the specification for a total of two consecutive days or a maximum total production of 600 tons of hot mix asphalt, the production will be halted by issuance of a field notice by the Project manager.
The test results shall be used by the Contractor to determine the cause or factors that may be a contribution to the problem and to determine a solution. The Contractor shall propose a plan to solve the problem. Approval of the plan must be obtained from the Project Manager before resumption of paving operations. Upon approval of the proposed plan, the Contractor may resume operations to determine if the actions taken have corrected the problem. The Contractor shall limit production to 300 tons during a trial run period in which the asphalt will be tested in 100 ton increments. If the testing indicates that the problem has been corrected, the Contractor may resume full operations. If the problem has not been corrected, further trial runs and testing as described herein will be required. The Contractor will be responsible for providing the testing during the trial run period.
If all procedures listed above have been exhausted and problems continue to occur and/or are not remedied in the manner or time agreed upon;
326.70 COMPACTION OF MIXTURE
Compaction shall be effected by the rubber‑tired rollers and tandem rollers (steel wheel) specified hereinbefore. Rolling of the mixture shall begin as soon after placing as the mixture will bear the roller without undue displacement. Delays in rolling freshly spread mixture will not be tolerated. Alternate trips of the roller shall be of slightly different lengths. The initial longitudinal rolling shall be effected by the use of tandem rollers. Incidental to any paving the contractor shall provide a rolling pattern to the Project Manager prior to the beginning of work.
Rollers shall move at a slow, not to exceed three (3) MPH (264 Ft/min.), uniform speed, with the drive roll or wheels nearest the paver. The speed of the paving machine shall be coordinated with the production of the plant to achieve a continuous operation. Sufficient hauling equipment shall be available to insure continuous operation. The number and weight of rollers shall be sufficient to compact the mixture to the required density while it is still in a workable condition. The surface course shall be compacted to a minimum of 93% and a maximum of 96% of theoretical maximum density as determined by AASHTO T 209. No leakage from any roller shall be allowed to come in contact with the pavement being constructed nor shall any roller be permitted to stand motionless on any portion of the work before it has been properly compacted. Steel roller wheels shall be treated with water and detergent to prevent the adherence of the asphalt concrete, also water and detergent may be used on pneumatic-tired rollers but the quantity used must not be such as to be detrimental to the surface being rolled.
Final rolling of the top or finish course shall be accomplished with a steel wheel roller, removing all surface imperfections, including indentures made by pneumatic-tired rollers. Rolling of the surface shall be continued until all roller marks are eliminated and an acceptable density is achieved.
In areas not accessible to the roller, the mixture shall be thoroughly compacted with hand operated mechanical tampers. Any mixture that becomes mixed with foreign material or in any way is defective shall be removed, replaced with fresh mixture, and compacted to the density of the surrounding pavement.
326.75 CONTRACTOR QUALITY CONTROL FOR COMPACTION
The Contractor, at their own expense, shall monitor the compaction process by determining the density of the HMAC with a portable nuclear density device in conformity with ASTM D 2950.
Calibration of the portable nuclear device used by the Contractor shall be established from cut pavement samples (6” dia. cores). The density readings of the cut pavement samples shall be determined by the Contractor in accordance with AASHTO T 166 (weight, volume method) and the density readings of the pavement shall be determined by the portable nuclear density test device in conformity with ASTM D 2950 and shall be correlated by the Contractor. A minimum of three cut pavement samples shall be used to determine the correction factor to be applied to the nuclear density readings to match the unit weight of the cut pavement samples. The Contractor shall conduct density testing at the minimum rate of one per 250 tons and shall furnish results to the project manager within one business day.
If the project has more than one lift of HMAC, the Contractor shall determine a new correction factor for that lift.
It is intended that quality control density testing be done while the bituminous mixture is hot enough to permit further compaction if necessary. Rolling for any compactive effort will not be allowed beyond the point at which it becomes ineffective or damage begins to occur. Additionally, use of vibratory mode will not be permitted when the temperature of the mix is below 200ºF.
326.80 CITY QUALITY ASSURANCE TESTING FOR COMPACTION
The HMAC shall be divided into acceptance sections or lots of 750 tons or one day’s production, whichever is less, for the purpose of defining areas represented by each series of acceptance tests. The City shall use a stratified random sampling plan to enhance the quality of acceptance sampling and testing. The density of each acceptance section or lot shall be evaluated by a minimum of three cut pavement samples (6” dia. cores) taken in conformity with AASHTO T 166 at randomly selected sites within the test section. The cut pavement samples shall be taken and prepared by the Contractor for testing. The City acceptance lab shall do the testing. The Contractor shall core each lift of the HMAC full depth in accordance with applicable AASHTO and City procedures. All questions arising from the sampling operation, including diameter of core samples shall be decided by the Project Manager. The Contractor shall identify each core sample with a location marking and deliver all core samples to the test site within the time specified by the Project Manager. The mean density obtained for all tests in each acceptance section or lot shall be at least 93% of the theoretical maximum density as determined from AASHTO T 209. In addition, each individual test value obtained within an acceptance section or lot shall be at least 91.00% of the theoretical maximum density and shall not exceed 98.00% of the theoretical maximum density. In the event an individual test result falls below 91.00% or exceeds 98.00% of the theoretical maximum density, the Contract Administrator shall determine the disposition of the material represented by the test.
326.86 PRICE ADJUSTMENT FOR DENSITY (CONTRACTED PROJECTS)
The payment of the unit price will be adjusted for density as outlined in Table 326.86. The adjustment shall be applied on a lot by lot basis for each lift. The adjustment will be based on the average of all density tests for the lot. The price adjustment will be applied only to the pay item for HMAC.
TABLE 326.86
PERCENT OF MAXIMUM THEORETICAL DENSITY | PERCENT OF CONTRACT PRICE TO BE PAID |
Above 98 | * |
97.00-98.00 | 90% |
96.00-96.99 | 95% |
95.00-95.99 | 100% |
94.00-94.99 | 102% |
93.00-93.99 | 100% |
92.00-92.99 | 95% |
91.00-91.99 | 90% |
Less than 91.00 | * |
*This lot shall be removed and replaced. In lieu thereof, the contractor and the Public Works Director may agree in writing that it is in the best interest of the City that the lot not be removed but instead be paid for at 50% of the contract price.
If the pavement is constructed in conjunction with any other development such as part of a private development (Subdivision), failing densities shall be remedied as directed by the Director of Public Works.
326.87 JOINTS
326.90 SMOOTHNESS
The finished surfaces of the pavement shall not vary more than 3/16 inch for the surface courses, when evaluated with a 10 foot straight edge. The lot size shall be 1,000 square yards. Measurements will be made perpendicular and parallel to the centerline at distances not to exceed fifty (50) feet. When more than 15 percent (15%) of all measurements within a lot exceed the specified tolerance, the contractor shall do corrective work at the Contractor expense as follows:
In the case that a lot contains less than 15 percent (15%) exceeding 3/16 inch when evaluated with a 10 straight edge but contains any area that exceeds 5/16 inch, the area that exceeds 5/16 inch shall receive diamond grinding at the Contractor’s expense. Any areas that require diamond grinding shall receive a fog seal application also at the Contractor’s expense.
The Contractor shall have a 10 foot straight edge available at all times during paving operations and when requested by the City for evaluation of completed work. Providing the straight edge shall be considered incidental to construction.
326.95 PROTECTION OF PAVEMENT
After final rolling, no vehicular traffic shall be permitted on the pavement until it has sufficiently cooled and hardened as determined by the Project Manager.
326.96 REPLACEMENT OF CORES
The contractor shall replace the HMAC at all core locations. The sides of the core hole shall be tacked with a brush and the new HMAC shall be compacted as approved by the Project Manager. The new HMAC shall be of the type used on the project and shall be placed at the required temperature.
326.97 CLEANING
The Contractor shall, as directed by the Project Manager, remove at his/her own expense from the Owner's property and from all public and private property, all temporary structures, rubbish, debris, or any waste materials resulting from his/her operations. He/she shall leave the entire site in a neat condition.
END OF SPECIAL CONDITION 20
Payment will be made to the Contractor for this work in accordance with the provisions of City change order policies by one of the following methods: contract unit prices, mutually agreed upon unit and lump sum prices, or force account basis.
| $500 & Less | Over $500 |
Contractor for work performed by own forces | 22% | 19% |
Contractor for work performed by subcontractor | 15% | 10% |
The above percent will be added to the sum of the project labor cost, materials cost, and equipment costs to determine the total cost of the change. (If the project if federal funded then the rate will be negotiated.)
No trenches longer than ten (10) feet, except bore pits, will be left open overnight In these situations, proper flashing lights, barricades, channelization devices, signs, and all other necessary nighttime and daytime traffic and pedestrian control devices will be utilized at all times from before dusk to after dawn, (flashing lights and barricades on a maximum of ten (10) feet centers shall be placed around the entire perimeter of the trench or excavation, and the entire perimeter shall be completely and securely roped off). Access shall always be provided to all driveways, etc., at night and on weekends and holidays. In addition, if work is to be suspended for three (3) or more days, absolutely no trenches or bore pits will be left open and all construction areas shall be completely cleaned up and set up for smooth and complete traffic and pedestrian flows. Proper traffic and pedestrian control devices shall be utilized continuously during construction, overnight, on weekends, and during holidays.
The Contractor shall make pavement/concrete cuts for utility connections, utility patching, storm drain construction, and all roadway work. The existing asphalt/concrete shall be saw cuts in neat, straight lines as directed by the city project manager. The method and equipment used for saw cutting shall be approved by the city project manager before any such cuts are made.
Pavement/concrete saw cuts shall be kept to the minimum width necessary to perform the required utility, roadway, or drainage work, or to accommodate the contractors paving equipment.
The cost of the saw cuts shall be included in the bid prices for other items of work in the contract, and no direct payment will be made for pavement/concrete saw cutting.
The Contractor shall minimize the removal or damage to any landscaping or improvements within or adjacent to the parkway and sidewalks. Any removal of landscaping or improvements will have to be approved by the City Project Manager prior to removal. Any removed/damaged landscaping or improvements shall be replaced to existing condition with like material. All replacement items shall be approved by the City Project Manager prior to installation. The installation of replacement items shall be to the City Project Manager’s satisfaction. Any replacement of damaged or removed items will be at the Contractor’s expense.
The Contractor shall minimize the removal or damage to any signage within or adjacent to the parkway and sidewalks. Any removal of signage will have to be approved by the Project Manager prior to removal. Any removed/damaged signage shall be replaced to existing condition with like material. All replacement items shall be approved by the Project Manager prior to installation. The installation of replacement items shall be to the Project Manager’s satisfaction. Any replacement of damaged or removed items will be at the Contractor’s expense.
An adjustment will be made to the contract bid items which include asphalt binder if the monthly price index of asphalt fluctuates from the established base price index beyond 10% as maintained by the New Mexico Department of Transportation (NMDOT) State Materials Bureau during the period of a progress payment. Adjustment is not optional. For items paid by the square yard, the tonnage of Hot Mix Asphalt (HMA) will be converted by assuming a unit weight of 100 lbs. per square yard per inch. The tonnage of asphalt binder will be determined by taking the tonnage of HMA computed times the percentage of asphalt binder required in the approved mix design.
Items subject to adjustment are:
The Contractor shall submit at the monthly status meeting applicable mix designs, including the percentage of asphalt binder and tonnage of HMA placed for the month for inclusion in the price adjustment for each HMA pay item listed above in the Contract.
For increasing prices, the monthly adjustment shall apply on those contracts whose monthly fluctuations are above a (B/C) ratio, defined below, of 1.10 using Equation (1).
For decreasing prices, the monthly adjustment shall apply on those contracts whose monthly fluctuations are below a (B/C) ration, defined below, of 0.90 to minimum (B/C) ration of 0.60 using Equation (2).
Only the differential percentage change beyond 10% will be used to calculate the asphalt binder price adjustment per Equations (1) or (2):
Equation (1): A = [B – (1.1 X C)] X D
Equation (2): A = [B – (0.9 X C)] X D
Where:
A = Adjustment to the Contract for asphalt binder in dollars ($).
B = Latest Average Monthly Rack Price per ton of asphalt binder.
C = Base Price Index: Average Monthly Rack Price per ton of asphalt binder for the month of
the Bid Opening.
D = Tons of Asphalt binder placed.
Monthly Adjustment: At each project monthly progress payment, the asphalt binder tonnage that has been placed since the previous monthly project monthly progress payment will be totaled and an adjustment determined by either Equations (1) or (2), as appropriate and when necessary, using the latest monthly average asphalt price. If the use of Equation (2) results in a (B/C) ratio less than 0.60, then the (B/C) ratio will be fixed at a value of 0.60.
For the purposes of making these calculations, the NMDOT State Materials Bureau will maintain a database of average weekly selling price indexes. The index will be based on the average weekly selling price for New Mexico. In order to have a “real time” cost index more indicative of the actual market conditions in New Mexico the NMDOT will use the published rack prices of the major suppliers in the state. The cost of the two major types of asphalt used in the New Mexico construction program PG 64-28 and PG 70-22 will be used to set the high and low range for asphalt material in the index and the Department will use the average of these two prices as its monthly index. The rack prices will be taken from the prices published by the state producers weekly and the average of these prices used to determine the average asphalt index in the state monthly. These rack prices are documented by the suppliers to the NMDOT via direct hard copy reports. The published Average Monthly Rack-Price will be calculated using the following formula:
Average Monthly Rack - Price = Average of the reported average weekly selling prices using the last four reported weeks on or prior to the last day of a given month as published by the New Mexico Department of Transportation Materials Bureau.
The current New Mexico Asphalt Rack – Price Data and Average Monthly Rack - Price Index will be sent, by NMDOT via e-mail, to the City of Las Cruces and the Albuquerque office of the Associated Contractors of New Mexico for distribution to their members.
THE FOLLOWING EXAMPLE WILL EXPLAIN THE ASPHALT BINDER PRICE ADJUSTMENT PROCEDURE:
The type of asphalt is Type “B”, with required asphalt content from the approved mix design of 6%.
The project was bid during the month of July 2008.
The amount of hot mix placed during the month of September 2008 is 10,000 square yards. The bid item for this work is paid by the square yard at a thickness of 2 inches.
Step One: Determine the tonnage of hot mix placed during the month.
(10,000 s.y. X 100 lbs. /s.y. inch X 2 inches)/2000 lbs. /ton = 1,000 Tons
Step Two: Determine the tonnage of binder placed.
1,000 Tons (hot mix placed) X 6% = 60 Tons
Step Three: Determine the B/C ratio.
From the attached spreadsheet for the Average Monthly Rack - Price:
C = $800.00
Assuming that the Average Monthly Rack - Price for September 2008 is $1,000.00.
B = $1,000.00
B/C = 1000/800 = 1.25
Now therefore since the B/C ratio is greater than 1.1, apply Equation (1):
A = [B – (1.1 X C)] X D = [1000.00 – (1.1 X 800.00)] X 60 = $7,200.00
Payment will be made to the Contractor in the amount of $7,200.00 for the month of September 2008.
Per GC-41 of the General Conditions, the Contractor is responsible for disposal of construction site materials. Commercial disposal service procured by the Contractor must be obtained from the City or from a private solid waste disposal company holding a current agreement with the City for the collection and disposal of construction site materials in compliance with City Council Resolution No. 06-034.
In accordance with Federal Environmental Protection Agency (EPA), New Mexico Environmental Department Air Quality Bureau (NMED or the State), and Office of Safety and Health Administration (OSHA), the City of Las Cruces and it’s contractors shall fully comply with Asbestos Regulations identified 40CFR 61, Subpart M National Emission Stand for Asbestos (NESHAP).
Contractors involved in projects that have or have the potential to involve asbestos materials shall complete and submit in conjunction with the City project representative the NMED Asbestos Notification Form included in the Bid Documents Package 10 days (40CFR 61, Subpart M 61.145 (b)) in advance of work. This notification can be updated in the event that no asbestos was or is no longer likely to be encountered.
In projects that there is known asbestos materials, or that asbestos materials is encountered the contractor is responsible for notifying the City project manager, NMED, and further provide the name of the on-site supervisor or subcontractor having asbestos regulatory training per 40CFR 61, Subpart M 16.145 (8) if not previously provided in advance. The contractor shall perform an assessment of the nature of the asbestos, material volume, and its handling and or removal procedures shall be done in accordance with specified regulations and with notification to NMED. All appropriate safety gear specified by OSHA shall be provided to all staff directly involved in asbestos handling and remediation activities.
References
National Emissions Standards for Hazardous Air Pollutants (NESHAPs), 40 CFR 61.0,
http://www.epa.gov/ttn/atw/eparules.html.
National Institute for Occupational Safety and Health (NIOSH) (1985) Occupational
Safety and Health Guidance Manual for Hazardous Waste Site Activities, Publication
Number 85-115, http://www.cdc.gov/niosh/pdfs/85-115.pdf
Mineral Aggregate- Use one hundred percent (100%) manufactured mineral aggregates that shall be generated by crushing operations from a single source and shall be composed of clean, tough, and durable particles of crushed tap rock, crushed granite, crushed sandstone or other high-quality aggregate as approved by the City’s Project Manager. A sand equivalent of sixty-five (65) or higher is required. The aggregate shall show a maximum weight loss of twenty-five percent (25%) when subjected to four cycles of conditioning using magnesium sulfate solution in accordance with AASHTO T 104 and Resistance to degradation of small-size coarse aggregate by abrasion and impact of thirty percent (30%) maximum in accordance with AASHTO T 96. The tests shall be performed on the gradation to be used on the project.
Mineral Aggregate Gradation Type- when tested in accordance with AASHTO T 27 and AASHTO T 11, the mineral aggregate shall conform to the following gradation requirements for Type III as specified by the District Engineer or their designee.
Type III (Course Graded Surface Course) | Percent Passing by Weight | Stockpile Tolerance |
½ inch | 100 | 0 |
3/8 inch | 98-100 | ±2 |
NO. 4 | 86-94 | ±5 |
NO. 8 | 45-65 | ±5 |
NO. 16 | 25-46 | ±5 |
NO. 30 | 15-35 | ±5 |
NO. 50 | 10-25 | ±4 |
NO. 100 | 7-18 | ±3 |
NO. 200 | 5-15 | ±2 |
The gradation of the aggregate stockpile shall not vary by more than the stockpile tolerance from the mix design submitted by the contractor while also remaining within the specification gradation band. The percentage for aggregate passing any two successive sieves shall not change from one end of the specified range to the other end.
Screening shall be required at the stockpile if there are any problems created by oversized materials in the mix.
Mineral Aggregate Stockpiling and Storage:
If the mineral aggregates are stored or stockpiled, they shall be handled in such a manner as to prevent segregation, mixing of the various materials or sizes, and contamination with foreign materials. The grading of aggregates proposed for use and as supplied to the mixing plant shall be uniform. Suitable equipment of acceptable size shall be furnished by the Contractor to work the stockpile sand to prevent segregation of the aggregates. The aggregate shall be passed over a scalping screen prior to transfer to the micro-surfacing mixing machine to remove oversize material.
Emulsified Asphalt:
The asphalt emulsion materials shall be designated as CSS-1hP or CQS-1hP and shall meet the requirements of AASHTO M 208 for each perspective designation (CSS-1hP or CQS-1hP) with the following exceptions.
EMULSION TESTS
TEST METHOD | DESCRIPTION | SPECIFICATION |
AASHTO T 59 | Settlement and Storage of Emulsified Asphalt 24-h | 1% Maximum |
AASHTO T 59 | Distillation of Emulsified Asphalt * | 62% Minimum |
AASHTO T 53 | Softening Point of Asphalt Residue | 135° F Minimum |
*The temperature for this test should be held at 350 ± 9° F for 20 minutes. The mixture shall be agitated constantly during the distillation process with a gentle stirring action. Complete the total distillation in 60 ± 5 minutes from the first application of heat.
The polymer shall be incorporated by blending with approved base asphalt prior to emulsification or it shall be co-milled with the asphalt to produce the finished emulsion. The distillation residue of the modified emulsion shall contain a minimum of 3.0 percent polymer by weight. Each load of emulsified asphalt shall have a certificate of Analysis/Compliance indicating that the emulsion meet specifications.
Mineral Filler:
Mineral filler shall be non-air-entrained Portland cement which is free of lumps or foreign matter conforming with the requirements of American Association of State Highway and Transportation Officials (AASHTO) AASHTO-M17. The type and amount of mineral filler needed shall be determined by a laboratory mix design and will be considered as part of the mineral aggregate gradation. An increase or decrease of less than one percent (1%) may be permitted when the micro-surfacing is being placed if it is found to be necessary for better consistency or set times.
The Contractor shall conduct trial mix designs for both Portland cement for each individual project and or aggregate source. The trial mix results shall be submitted to the City’s Project Manager for review and written approval two weeks prior to construction.
Water:
The water shall be potable and shall be free of harmful soluble salts, reactive chemicals and any other contaminants.
Other Additives:
With the approval of the City’s Project Manager, additives approved by the emulsion manufacturer may be added to the emulsion mix or to any of the component materials to provide control of the set time in the field. Appropriate additives and their applicable use range should be approved by the laboratory that submitted the mix design.
Mix Design:
The mixture design and resulting job mix formula shall be supplied by the Contractor. The following shall be required in the mix design provided by the Contractor: The mix design shall show the results of the wet cohesion test run in accordance with International Slurry Surfacing Association (ISSA) standard ISSA-TB-139 and shall have minimum values of 12 kg-cm min, at 30 minutes and 20 kg-cm min. at 60 minutes. The mix design shall show the results of the loaded wheel test run in accordance with ISSA-TB-109 and shall have a maximum value of 50 g/sq. ft. The mix design shall show the results of the wet track abrasion test run in accordance with ISSA-TB-100 and shall have maximum values of 50 g/sq. ft. after one hour of soaking and 75 g/sq. ft. after six days of soaking. The optimum asphalt content shall be selected between the minimum asphalt content found by the wet track abrasion test and the loaded wheel test. The mix design shall show the source of the aggregate to be used in the mix, the results of tests, mix compatibility tests, and mix design gradation. The mix design shall show the type of asphalt emulsion, the base stock asphalt cement, the manufacturer of the polymer, and the manufacturer of the emulsified asphalt. The mix design shall show the percent asphalt emulsion to be included in the mix as percent of dry aggregate weight. The mix design shall show the type of mineral filler and the percent of aggregate weight and allowable variation. The mix design shall show allowable additives and allowable percentage of additives by weight of aggregate, to control mixing and breaking. These mix design requirements may be subject to verification to testing of laboratory produced mixes or trial batch material prior to placement of project material.
Composition of Mixture:
The polymer modified micro-surfacing shall consist of a uniform mixture of aggregate and CSS-IP emulsion and mineral filler, water and field control additive as required. The emulsion and aggregate must be compatible so that a complete uniform coating of the aggregate will be obtained in the mixing process. The mixture must have sufficient working life to allow for proper placement at the existing ambient temperature and humidity. When the paving mixture is placed with the relative humidity of not more than 50% and ambient air temperature at not more than 75 degrees F, it must cure sufficiently that uniformly moving traffic can be allowed in one hour with no damage to the surface. Location subject to sharp turning or stopping and starting traffic may require additional curing.
The job mix formula shall meet with the approval of the Project Engineer or their designee; and proportions to be used shall be within the following limits:
Residual asphalt | 6.0 to 9.0% combined weight of dry aggregate and mineral fill |
Mineral filler (Portland cement or Hydrated lime) | 0.5 to 3.0% by weight of dry aggregate |
Field control Additive | As required to provide control of break and cure |
Water | As required to provide proper consistency |
The mixture shall be designed so that the mineral aggregate will produce a gradation which conforms to the limitations for the design grading for the type specified herein. The gradation will be determined in accordance with AASHTO T 11 and shall be based upon aggregate mineral filler.
Determination of Mixture Composition and Tolerances:
Determination of aggregate gradation may be based on sieve analysis of representative samples taken from the stockpile at the job site. The amount of mineral filler added to the mix shall be included in determining the total minus no. 200 aggregate fraction. (The asphalt content may be determined with a nuclear asphalt content gauge (NAC). Alternatively, aggregate gradation and asphalt content may be determined by AASHTO T 164.
Mix samples will be taken from the mixing unit discharge in a manner such that the complete discharge stream is included in the sample. Mix samples shall be dried to constant weight at 230°F plus or minus 10°F prior to determination of asphalt content and aggregate gradation.
General:
It shall be the responsibility of the Contractor to produce, transport, and place the specified paving mixture in accordance with these specifications and as approved by the City’s Project Manager. The finished micro-surfacing shall have a uniform texture free from excessive scratch marks, tears or other surface irregularities. The cured mixture shall adhere fully to the underlying pavement.
Equipment:
All equipment for the handling of all materials and mixing and placing of the mixture shall be maintained in good repair and operating condition and is subject to the approval of the City’s Project Manager. Any equipment found to be defective and potential affecting the quality of the paving mixture shall be replaced. All scales used in weighing aggregate and emulsion shall conform to the requirements of section 401.
The material shall be mixed by a self-propelled micro-surfacing mixing machine which shall be a continuous flow mixing unit able to accurately deliver and proportion the aggregate emulsified asphalt, mineral filler, field control additive and water to a revolving multi-blade mixer; and discharge the mixed product on a continuous flow basis. The machine shall have sufficient storage capacity for aggregate, emulsified asphalt, mineral filler, field control additive, and water to maintain, an adequate supply to the proportioning controls. The machine shall also be equipped with self-loading devices which provide for the loading of all materials while continuing to lay micro-surfacing, thereby eliminating unnecessary construction joints. The machine shall be equipped with opposite side driving stations to optimize longitudinal alignment. The machine shall be equipped to allow the mix operator to have full hydrostatic control of the forward and reverse speed during application of the micro-surfacing material. The self-loading devices, opposite side driving stations and forward and reverse speed controls shall be original equipment manufacturer design individual volume or weight controls.
Individual volume or weight controls for proportioning each material to be added to the mix shall be calibrated and properly marked. The aggregate feed to the mixer shall be equipped with a revolution counter or similar devices so that the amount of aggregate used may be determined at any time.
The mixing machine shall be equipped with a water pressure system and nozzle type spray bar to provide a water spray immediately ahead of and outside the spreader box. It also shall, be equipped with an approved fines feeder that shall provide a uniform, positive, accurately entered, metered, predetermined amount of the specified mineral filler.
The machine shall have an Electronic Monitoring System (“EMS”). The EMS shall monitor and display application rates and totals used for aggregate, emulsion, fines, water and additive. It shall also calculate and display ratios of emulsion to aggregate, fines to aggregate, additive to aggregate, water to aggregate and application rate in lbs. per sq. yd. (requires operator to input spreader box width). A hard copy report must be able to be printed on demand which will display: date, weight of aggregate used since last reset, weight of emulsion used since last reset, weight of fines used since last reset, gallons of additive used since last reset, gallons of water used since last reset, emulsion to aggregate ratio, fines to aggregate ratio, additive to aggregate ratio, water to aggregate ratio.
Spreading Equipment:
The paving mixture shall be spread uniformly by means of a mechanical type spreader box attached to the mixer equipped with paddles or other devices to agitate and spread the materials throughout the box. The spreader box used must be capable of obtaining the desired lines and grade as shown on the plans. A front seal shall be provided to insure no loss of the mixture at the road contact surface. The rear seal shall act as a strike off and shall be adjustable. The mixture shall be spread to fill cracks and minor surface irregularities and leave a uniform skid resistant application of aggregate and asphalt on the surface. The spreader box and rear strike-off shall be so designed and operated that a uniform consistency is achieved to produce a free flow of material to the rear strike-off. The seam where two spreads join shall be neat appearing and uniform. A secondary strike-off shall be provided to improve surface texture. The secondary strike-off shall have the same adjustments as the rear seal.
Surface Preparation:
The Contractor shall supply and make available, at all times all the necessary equipment required to clean and sweep the surfaces to be treated. Areas to be swept and cleaned are to be determined by the Project Engineer or their designee. A self-propelled power sweeper will be required for surface preparation.
Placement Operations:
The area to be surfaced shall be thoroughly cleaned of all vegetation, loose aggregate and soil. Water used in pre-wetting the surface ahead of and outside the spreader box shall be applied at a rate to dampen the entire surface without any free-flowing water ahead of the spreader box.
Temperature & Weather
The material shall be spread only when the atmospheric temperature is at least 50° F and rising and the weather is not foggy or rainy and there is no forecast of temperatures below 32° F within 24 hours after mix placement.
Test Strip
Prior to commencing paving operations:
Ruts:
The City’s Project Manager may direct the preliminary micro-surfacing material to be placed to fill ruts, utility cuts, depressions in the existing surface, before the final surface course is placed. Ruts of ½ inch or greater depths shall be filled independently with a rut filling spreader box either 5 foot or 6 foot in width. For irregular or shallow rutting less than ½ inch depth, a full-width scratch coat pass may be used as directed by the project manager. Each individual rut fill, utilizing a rut filling spreader box shall be crowned to compensate for traffic compaction. Ruts that are in excess of 1- ½ inches depth may require multiple placements with the rut filling spreader box to restore the original cross section.
Surface Tolerances:
No excessive build-up, uncovered area, or unsightly appearance will be permitted on longitudinal or transverse joints. Longitudinal joints shall be placed on lane lines. Excessive overlap will not be permitted. Care shall be taken to insure straight lines along the roadway centerline, lane lines, or shoulder curb lines. Lines at intersections will be kept straight to provide a good appearance.
Areas which cannot be reached with the mixing machine shall be surfaced using hand tools to provide complete and uniform coverage. The area being worked by hand shall be lightly dampened prior to mix placement.
Care shall be exercised in areas that require hand work so that the finished surface is uniform in texture, dense, and of overall appearance comparable to that produced by the spreader box. Micro-surfacing material required to repair deficiencies due to unsatisfactory workmanship will be designated by the City’s Project Manager.
Finished Surface:
The Project Manager will make inspections of the finished surface at any time. On any 30 square yards of surface area inspected, comply with the following:
Method of Measurement:
Micro-surfacing will be measured by the ton.
Aggregate:
The quantity of aggregate used in accepted portions of the work shall be measured by the electronic monitoring system on paving machine as provided in printed tickets. The amount of aggregate must fall between the specified ranges of 25-26 lbs. of dry aggregate per square yard of micro-surfacing treatment to be acceptable. Any weight outside these ranges must be pre-approved by the Project Manager or will be rejected. No payment will be made for additional lbs of dry aggregate above the specified range.
Polymer Modified Asphalt Emulsion:
The quantity of polymer modified asphalt emulsion in the accepted portions of the work shall be measured by tons of material based on the accepted load tickets issued from the supplier at the completion of the project any unused emulsion shall be weighed back and that quantity deducted from the accepted asphalt emulsion quantity delivered. Mineral filler, modifier, water and all other additives shall be considered subsidiary items and shall not be paid for separately.
Mineral Filler:
The quantity of mineral filler (Portland cement) in the accepted portion of the work shall be measured by the ton and shall be included in the micro-surfacing items. At the completion of the project any unused mineral filler shall be weighed back and that quantity deducted from the accepted mineral filler quantity delivered.
Substantial Completion shall be defined as the time at which all work delineated in the plan set and contract has been completed in its’ entirety before punch list items are complete. Punch list items are only for minor corrective work. The contractor shall request substantial completion in writing to the Project Manager. Once substantial completion has been granted, contract time will stop and a final inspection will be scheduled. After the final inspection, a punch list will be submitted to the contractor. The punch list will include any corrective work as well as all required closeout paperwork, including but not limited to, final invoice, release of liens, affidavit of wages paid, record drawings, consent of surety, and any other contractual obligations. The contractor shall have 20 working days (unless extensions are approved by the CLC Project Manager) to complete all punch list items, starting one working day from the date the punch list was sent. If all punch list items are not completed within the allotted time, liquidated damages will be assessed, in an amount as outlined in SC-4 Liquidated Damages, for every additional work day required.
The Contractor shall provide equipment from the City of Las Cruces-Traffic Signal and Street Lighting Approved Products List (CLC-APL) as shown in this special condition.
*ATTACH MOST RECENT APPROVED PRODUCT LIST FROM TRAFFIC MANAGEMENT
END OF SPECIAL CONDITIONS SECTION
In compliance with the Bid Specifications, Bidding Conditions, and Purchase Order Terms and Conditions, I, the undersigned, offer and agree to furnish any or all items upon which prices are offered at the price set opposite each item, to the City within the time specified.
I (we) further certify that this company has not been debarred, suspended, or otherwise made ineligible for participation in Federal Assistance programs under Executive Order 12549 “Debarment and Suspension” as described in the Federal Register Rules and Regulations.
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