Event_4235_-_Specification.pdf

City of Minneapolis DEPARTMENT OF PUBLIC WORKS General Requirements for

Event 4235 - Crushing Rubble Concrete

I hereby certify that these specifications were prepared by me, or under my direct supervision, and that I am a duly Registered Professional Engineer under the laws of the State of Minnesota.

Tracy Lindgren

Date ___7/22/2026___________________ Minnesota Registration Number 51729

July 2026

City of Minneapolis

CRUSHING RUBBLE CONCRETE

Section 1. STANDARD SPECIFICATIONS WHICH APPLY

State of Minnesota, Department of Transportation's "Standard Specifications for Highway Construction" 2025 edition and as amended by any other subsequent supplemental specifications, which apply (reference MNDOT Specification 3138). The contractor will be required to provide crushing for:

• Crushed Concrete, class 5

• 2 " washed drain rock

• 6” minus crushed As a part of this contract. These materials will be in separate piles at the Linden site.

Section 2. SCOPE OF WORK

The work to be done under this contract shall consist of the furnishing of all labor, power, equipment, conveyors, supplies, materials, and tools to crush the following items:

1. Rubble concrete pavement structures (pavement, curb and gutter, driveways, alley and sidewalk slabs).

2. Large to small, reinforced traffic signal foundations.

3. Precast manhole sections/bottoms/tops, and reinforced concrete pipe

(various diameters).

into MNDOT Class 5 aggregates, 2” Drain rock and/or 6” minus.

Section 3. PERMITS

The contractor is required to procure all necessary permits and/or license to operate this crushing operation, pay all charges, taxes, and fees, and follow and comply with all noise, dust and waste disposal rules, regulations, and laws. The above is to include, but not limited to, the following agencies:

City of Minneapolis

a. Water hydrant permit

b. surface waters division and inspection division

Hennepin County Minnesota Pollution Control Agency Minnesota Department of Natural Resources The United States Environmental Protection Agency The United States Corps of Engineers

The Contractor is required to submit copies of these permits and licenses to the engineer which apply to this crushing operation. No additional compensation or time extensions will be granted for any disruptions of work or loss of time occasioned by any actions brought against the contractor for failure to comply with air and land pollution controls. This work is considered incidental, and no direct compensation will be made, therefore.

The Contractor must include with his bid proposal, a letter from him verifying that he has completed and sent to the Minnesota Pollution Control Agency his company's MPCA permit application for air emissions. At the request of the Engineer, the Contractor may be required to show a copy of this permit application and a letter from the Minnesota Pollution Control Agency indicating that this permit is administratively complete. This information must be completed prior to acceptance of the Contractor's bid proposal. Failure to do so will result in the City's option to reject the Contractor's bid proposal.

Section 4. CONTRACT TERMS

This contract is for the 2027 construction season. The City of Minneapolis reserves the right to extend this contact for one (1) additional year for the 2028 season, Section 5. LOCATION OF WORK SITE

The crushing site is located near the northwest corner of Interstate 394 and Interstate 94. This property is owned by the City of Minneapolis. The size of this parcel of land, which is dedicated for crushing rubble materials, is approximately 1200 feet by 250 feet and is on the east end of the fenced in area.

In addition, there are two existing sewers (a storm at 48" diameter and a sanitary arch at nine feet diameter) which cross this site. Due to the age and condition of these pipes, the contractor is not allowed to place his machinery, trailers, or crushed materials within 30 feet of the center of these sewers. The bidder is only allowed to drive his tired equipment over them and is required to minimize possible damage to these sewers. The exact location of these sewers lies between the two existing catch basins on the crushing site.

The Contractor is responsible for the protection and security of his personnel, equipment and materials. Any damage or loss is considered incidental to this contract. The City of Minneapolis will provide no compensation or security of the work site for this contract. The results of the items list in this section will not be just cause or any time extension or delays to this contract.

Section 6. SOURCE OF MATERIAL

City of Minneapolis construction crews and hired contractors have removed these materials from city projects and hauled it to the crushing site.

Section 7. CONTRACT REQUIREMENTS

The contractor shall furnish all labor, power, equipment, supplies, water, materials, and tools to remove the concrete from the stockpile and process it through the crusher. Measures should be taken to minimize material segregation. These measures may include limiting the height of stockpiles or bulldozing stockpiles to assure proper distribution of materials.

Items listed below are considered incidental and part of this crushing contract and no additional compensation shall be made:

1. All crushing equipment, mobile offices, vehicles, supplies, stockpiles of materials or employee's vehicles, etc., associated with the crushing contract will be confined to the crusher site as defined as the existing fence line which surrounds the Linden property.

Further the contractor shall maintain access for the City of Minneapolis for their operations during this crushing contract. During this operation, the Engineer shall be allowed access into the contractor’s work area and allowed to inspect all equipment for his review.

2. After notice by the City of Minneapolis to begin work the contractor shall have 7 calendar days to begin crushing operations, failure to meet this date may/will forfeit the contract bid for mobilization.

3. All crushed material will be stockpiled on site. The newly crushed stockpile will be located by the Engineer. Any extra handling, extra conveyers, etc., necessary to pile the newly crushed material into a stockpile in these designated location, or separate locations, anywhere on this site, will be performed by the contractor and no additional compensation will be made.

4. The contractor shall have the capacity to crush a minimum amount of 2,500 tons per day in his operation; failure to produce this amount daily will result in cancellation of this crushing contract.

5. The contractor maybe directed to crush in multiple stages and/or locations, therefore the estimated amount is defined as an aggregate total, and not a single event.

6. The maximum height of the crushed material, any conveyers, or other equipment shall not exceed the height of approximately 70 feet.

7. The contractor will be required to maintain dust control. This work may entail water application, use of screens or other means as deemed necessary by the Engineer. The use of mechanical piping from the water source to the crushing operation will not be allowed. No water or water source will be provided by the City of Minneapolis. The Contractor can contact Minneapolis Water Department at 673-5600 to make arrangements for a water hydrant permit. If the dust from this crushing operation is deemed a nuisance, the Engineer will require the contractor to shut his operations down until the dust problem is corrected.

Further if the contractor crosses the existing bike trail to provide water to the crushing facility, they will be responsible for the crossing, and maintenance of this crossing and temporary ramps so there is no interruption to the biking trail. Two warning signs will be placed to warn bicyclists of any crossing or ramps to supply water to this site. The cost for all this work is considered incidental to this contract and no additional compensation will be made for this work.

8. Disposal of any reinforcing bar, steel bar, treated wood, PVC pipe, large traffic signal anchor bolts, cast iron, and undesirable debris (wood, metal, etc.), noncrushable concrete, boulders which are separated during crushing operation must be removed from the site and disposed of in a proper and legal manner. Any debris left behind and not disposed of by the contractor will result in the City of Minneapolis performing this task and all; labor, equipment, disposal costs, supervision and overheads will be deducted from the contractor’s payment.

9. The City of Minneapolis will provide no power or power source and security of the work site.

10. The City will take samples for sieve analysis on the conveyor belt.

11. The contractor is required to provide one approved belt scale per each operation for measurement and payment.

12. The bidder should visit the site, examine the material in the stockpile, and perform any tests that they deem necessary prior to submitting a bid or during the crushing operation. The contractor assumes full responsibility to ensure that the material passes these contract specifications. If the crushed materials fail to meet the specifications, the contractor shall be required to make any approved corrective actions to make the crushed material pass these contract requirements.

13. The City of Minneapolis will provide random sampling and testing of materail for compliance to this contract, test will be conducted at a rate of one per day or as directed by the engineer. Any additional tests requested by the contractor will be at his sole expense.

14. The following acts are prohibited:

• Open burning of any material.

• Allowing oil, grease, petroleum products or other harmful, hazardous or noxious liquid to run off the yard or be absorbed into the ground.

• Storing of hazardous materials except in accordance with local, state and federal laws.

15. The Contractor shall conform to the requirements of the City of Minneapolis with respect to hours of operation, dust control, noise control, safety requirements, and maintenance of a neat and orderly job site. The Contractor is required to stop operations on every Thursday during the length of this contract for the City of Minneapolis, Impound Lot Auction that occurs between the times of 10:00 a.m. to 12:00 noon.

16. Upon completion of the contract, the site shall be left in a condition, which is acceptable to the City of Minneapolis. The Contractor is required to flatten the crushed concrete pile so that one uniform pile exists. He is also required to build a road to the top of this pile such that a standard 3 cubic yard - tired loader may drive up onto the top of this pile. Also, any access keys which have been provided by the City to allow access for the contractor shall be returned.

17. Gradation Requirements are as follows:

Crushed Concrete, Class 5 The crushed concrete material shall meet the following gradation requirements for Class 5 aggregate as specified in the State of Minnesota Department of Transportation, Standard Specifications to Construction, 2025 edition, MNDOT Specification number 3138, base aggregate.

2-inch Drain Rock The Drain Rock shall be crushed to the requirements listed below:

Sieve Size % Passing Sieve

2.0 inch 100 3/4 inch 0-25 #4 sieve less than 7 #200 sieve less than 1.5

Note: that this material shall be washed with a system to provide a clean washed drain rock, the cost for this washing such as; excavation for any wash pits, supply of water, power, and an acceptable erosion and drainage/settling system is considered incidental, and no additional compensation will be made. Failure to meet these requirements will result in NO PAY for this item.

6 inch minus crushed The 6 inch minus must be 100% crushed and be a well graded material.

Section 8. METHOD OF MEASUREMENT

The unit of measurement will be by the ton from an approved belt scale. The Contractor is responsible for testing, calibration, servicing and maintaining of the Belt Scale so it conforms to National Bureau Standards Handbook 44 (1984) requirements.

During initial start-up operations, the Contractor will be required zero out their scale with a city staff present to observe. Once crushing has commenced the contractor shall have a technician from the belt scale Service Company present. The technician, together with City personnel, will test and calibrate the belt scale. Test loads will be taken, and the resulting scale weight will be compared with the weights of the same loads as measured by a registered and approved scale. Calibration and testing will continue until the belt scale weights agree within +_ or - one half percent (0.5%) of the registered scale weights. If this level of accuracy cannot be achieved, the Engineer reserves the option of adjusting payment to the Contractor to compensate for any established disparity in favor of the City. Periodic material and belt scale weight tests will be run. This will necessitate the Contractor loading City of Minneapolis trucks, directly from the belt, which will be weighed and tared on a City approved scale. Any ramping and/or leveling of stockpiles, swinging of conveyers, loss of production time, or other, due to these tests will be considered incidental to this contract, and no compensation will be made, therefore.

Final payment will not be made until the contractor's worksite has been inspected for cleanup (all debris and waste hauled and disposed of) and approved by the Engineer, and all requirements of this contract have been fulfilled.

(1903) Compensation for Increased or Decreased Quantities. There will be no adjustments in unit price for increased or decreased quantities under this contract. The City of Minneapolis reserves the right to increase quantities up to 100% with no unit price adjustments.

Section 9. PAYMENTS

Partial payments will be made in accordance with MnDOT Specifications (1906) Partial Payments.

Final payment will be made after:

1. The Final Acceptance has been issued by the Engineer.

2. Contractor's equipment has been moved off site and all keys or other items borrowed from the City of Minneapolis are returned.

3. Proof provided by the Contractor, subcontractors, and trucking companies that they have complied with the provisions of M.S. 290.92 regarding withholding of MN State income taxes.

4. An affidavit has been received by the Engineer from the Contractor (including his subcontractors and suppliers) showing that all claims (lien waver) against them because of this Contract have been either paid or satisfactorily secured.

5. Items listed in this section shall be provided within 45 calendar days after written notice by the Engineer to final this project. Failure to provide this documentation by the designated time will result in an assessment of fifty ($50) dollars per calendar day for the 46th through 75th calendar days beyond this request. After the 76th day the Engineer will determine if; either a higher assessment or closing out the contract without final payment and release of the retainage due the contractor is in order. This charge will be assessed against the contractor’s retainage.

The contractor shall also be compensated for his mobilization onto and off the site. One mobilization shall constitute; moving on to the site, set up and moving off the site. If, upon approval of the Engineer, the contractor elects to move off this site for his own needs there will be no mobilization pay for.

Section 10. TIME SCHEDULE

Upon approval and award of this contract by the City of Minneapolis, the crushing operation shall be started as directed by the Engineer. During periods of severe weather, the Contractor may stop production with permission granted by the Engineer.

Revised on April 2003, January 2005, October 2008, October 2013, October 2014 December 2018, September 2021, October 2023, September 2024, July 2026