18-General Notices, Notes and Information.pdf

Preparer’s Certification for

Specifications, Special Specifications, Estimate and Specification Data

FOR:

ON-CALL - PATCHING MATERIAL (ASPPM) FOR HARRIS

COUNTY PRECINCT 3 - 2025, UPIN 25103MF3RJ01

Special Note:

The following items developed per the published Construction

Drawings have been verified and included in the Purchasing

Department’s Bid Specification Package which can be located at https://harriscountytx.bonfirehub.com/portal/. The items include:

Pricing/Delivery Information

Scope of Work

Special Provision to Standard Specifications

Special Specifications

Supplement to General Requirements

Contract Time

ON-CALL POLYURETHANE FOAM MATERIAL

INSTALLATION FOR HARRIS COUNTY PRECINCT 4 - 2025

UPIN 25104MF3VE01

SCOPE OF WORK

This On-Call Term Contract for Hydro-Insensitive High Density Polyurethane Foam Material and Installation and Related Items in Harris County Precinct 4, includes, but is not limited to, hydro-insensitive high density polyurethane foam material and/or installation services necessary for lifting and undersealing concrete slabs, and any related work. Traffic control shall be provided during all phases of construction and conform to the Texas Manual of Uniform Traffic Control Devices (TMUTCD). All construction shall be in accordance with the drawings, the specifications, and the TMUTCD. Pedestrian Facilities shall meet Texas Accessibility Standards.

The material used for lifting and undersealing concrete slabs and pavements must be a hydro-insensitive high density polyurethane formulation material. This material will contain a water insoluble diluting agent which creates a reactive formation of dimensionally stable polymer in the presence of excess water. The material must expand to fill any voids or fissures, level concrete, seal pipes, and restore load capacity.

The required material must be environmentally safe, forcing water out of the affected area. The material must not be affected by water or allow water penetration after the material has been used to treat an affected area.

Bid Item #3 (Soil Densification and Raising Asphalt Pavement with High Density Polyurethane Foam) shall be accomplished by furnishing and injecting a two-part, 1:1 by volume, water-resistant High Density Polyurethane Foam into the foundation soils beneath the pavement through injection tubes installed at locations directed by the Precinct Representative, while continuously monitoring for movement at the surface.

In the event of any installation, it is required that the Contractor conform to those specifications and standards developed by the manufacturer of the material. Installation (when required) and labor of this material will be the responsibility of the Contractor.

The execution of any job involving installation to be provided by the Contractor shall begin within five (5) working days of notification. The delivery of material only orders shall be within fourteen (14) calendar days of notification. The Contractor shall deliver to various Harris County job sites within Precinct 4.

The term of the contract shall be 12 months or when the contract expenditure is met, with the option for up to four (4) renewals at the discretion of Harris County.

During the project term, the HCED-CPD will notify the Contractor, at various times, of locations where work and/or material deliveries within Precinct 4 is to be completed.

The estimated bid quantities provided are contingent and only used only to evaluate bidder submissions. After the award, a Purchase Order will be issued based upon the Precinct’s available budget for this work. Supplemental Purchase Orders will be issued should additional materials be required. The Contractor shall be paid based upon actual accepted work completed, at the unit price included within the bid. The Contractor shall not be entitled to any additional payment due to variations between the bid and actual quantities. Harris County reserves the right to order materials in any quantity at the unit prices bid on an as-needed basis.

May 2019

GENERAL NOTICE TO CONTRACTORS

In accordance with House Bill 1059, a minimum of 25% of the work to be performed on this project shall be performed by the Bidder.

Special Notice: By law, the original price on firm fixed price contracts may not be increased by more than 25%. The original price may not be decreased by 18% or more without the consent of the contractor. Please monitor additions to your contract -additions in excess of 25% will not be paid under any circumstances.

On public works projects, all contractors shall supply a list of all suppliers and subcontractors with addresses and phone numbers, prior to work commencing.

At the time of the scheduled preconstruction meeting, the successful bidder shall supply to the County a list of representatives signed by an Officer of the Company who are authorized to sign official documents, i.e., Purchase Orders, Change Orders, Final Estimates, etc.

In determining who is a responsible bidder, Harris County may take into account the past performance of the bidder on Harris County projects. Commissioners Court adopted a written definition and criteria for determining the performance of a contractor which may be considered in determining the responsibility of a bidder.

Harris County is using an internet-based Construction Program Management Software, e-Builder to maintain consistent administrative and technical control for its projects throughout the County. The Contractor is required to use e-Builder on this project in accordance with procedures provided by the County.

At no cost to the Contractor, the County will provide system login account(s) and provide training for Contractor personnel. The Contractor must update e-Builder with any new or changed information within 24 hours of that information becoming known to Contractor. The Contractor must have access to a computer with internet access and a scanner to use eBuilder.

Harris County- Revised Precinct Boundaries

This map is a user generated static output from an Internet mapping site and is for reference only. Data layers that appear on this map may or may not be accurate, current, or otherwise reliable.

577,791

© Latitude Geographics Group Ltd.

18.2

THIS MAP IS NOT TO BE USED FOR NAVIGATION

Legend

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WGS_1984_Web_Mercator_Auxiliary_Sphere

Miles0 18.29.12 Notes Notes

Harris County Boundary Other Counties

Harris County

Commissioner Precincts 2021 Pct 1

Pct 2

Pct 3

Pct 4

World Street Map

NOTICE OF SPECIFICATIONS

For the construction of this project, the Contractor shall use the attached Special Provisions, Special Specifications, and Harris County Engineering Department (HCED) Specifications Book – Standard Specifications for the Construction of Road and Bridges by Harris County Engineering Department, effective date October 10, 2023. The current HCED specifications may be found at the HCED website: https://www.eng.hctx.net/ Portals/33/2023-Standard%20Specifications/HCED-EN0-SS-001-00-C_Standard% 20Specifications%2010.26.2023%20(Final).pdf?ver=GRDvtDMEWY-IlJTeDWV4Hw%3d% 3d

When applicable, the Contractor shall use the Harris County Flood Control District (HCFCD) 2005 Standard Specifications Book. The current HCFCD specifications may be found at the HCFCD website: https://www.hcfcd.org/Technical-Manuals/all-documents?folderId=8625& view=gridview&pageSize=10

When applicable, the Contractor shall also use the Texas Department of Transportation (TxDOT) 2024 Standard Specifications Book. The current TxDOT specifications may be found at the TxDOT website: https://www.txdot.gov/business/resources/txdot-specifications/2024-standard-specifications.html

When applicable, the Contractor shall also use the City of Houston (COH) Standard Specifications. The current COH specifications may be found at the COH website:

https://www.houstonpermittingcenter.org/office-city-engineer/design-and-construction-standards http://www.eng.hctx.net/Portals/33/Publications/professional-services/spec/2017/2017_HC_Stand_Spec.pdf http://www.eng.hctx.net/Portals/33/Publications/professional-services/spec/2017/2017_HC_Stand_Spec.pdf https://www.hcfcd.org/Technical-Manuals/all-documents?folderId=8625&%20view=gridview&pageSize=10 https://www.hcfcd.org/Technical-Manuals/all-documents?folderId=8625&%20view=gridview&pageSize=10 https://www.txdot.gov/business/resources/txdot-specifications.html https://www.txdot.gov/business/resources/txdot-specifications.html https://www.houstonpermittingcenter.org/office-city-engineer/design-and-construction-standards https://www.houstonpermittingcenter.org/office-city-engineer/design-and-construction-standards

SPECIAL SPECIFICATION

ITEM 8104

RAISING AND UNDERSEALING CONCRETE SLABS

( revised 1-23-2012 )

8104.1 Description. This item shall govern the raising and undersealing of concrete slabs.

8104.2 Material. The material used for raising concrete slabs shall be a hydro-insensitive high density polyurethane foam.

The hydro-insensitive high density polyurethane shall exhibit the following physical characteristics and properties:

A. Properties

Material Injected In-situ (after water injection)

Density, lbs/ft3 3.8

Tensile Strength, psi 88

Elongation, % 4.8

Compression Strength, psi (at yield point) 80

B. Applicable Documents

Type Test ASTM Designation Title Shear Strength C273 Test Method for Shear Properties of Sandwich Cores Materials Solvent Resistance D543 Standard Practices for Evaluating the Resistance of Plastics to Chemical Reagents

Coefficient of D696 Test Method for Coefficient Expansion of Linear Thermal Expansion of Plastics between –300C and 300C with a Vitreous Silica Dilatometer

Flexural Strength D790 Test Methods for Flexural

Properties of Unreinforced and

Item 8104 Page -2-

Reinforced Plastics and Electrical Insulating Materials

Compressive Strength D1621 Test Method for Compressive

Properties of Rigid Cellular Plastics

Density D1622 Test Method For Apparent Density of Rigid Cellular Plastics

Tensile Strength D1623 Test Method for Tensile and Tensile

Adhesion Properties of Rigid Cellular Plastics

Dimensional Stability D2126 Test Method for Response of Rigid

Cellular Plastic To Thermal and Humid Aging

Water Absorption D2842 Test Method of Water Absorption of Rigid

Cellular Plastics

Fungus Resistance G21 Standard Practice for Determining

Resistance of Synthetic Polymeric Materials to Fungi

8104.3 Equipment. A listing of lifting and undersealing equipment shall be submitted to the Engineer for review. The minimum list of equipment required shall be as listed below. The listing is a minimum and shall not preclude the use of additional equipment.

A. A pneumatic drill, capable of drilling 5/8-inch diameter holes.

B. A truck mounted pumping unit capable of injecting the high density polyurethane formulation between the concrete pavement and the subbase and capable of controlling the rate of rise of the pavement.

C. A laser leveling unit used to ensure that the concrete is raised to an even plane and to the required elevations.

8104.4 Contractor Experience. Contractor shall have three full years experience using high density polyurethane to raise and underseal concrete slabs as demonstrated by completed job references.

8104.5 Construction Methods.

Preparation. Prepare a profile of the street or road to determine where the concrete pavement needs to be raised.

Barricades. Before commencing work, the Contractor shall furnish, place and maintain adequate standard warning signs, lights and flagmen, if necessary, Page -3-in accordance with the "Manual for Uniform Traffic Control Devices". Where barricades are left on the site overnight, blinking lights shall be left on from sunset to sunrise. No separate payment shall be made for furnishing traffic control devices and flagmen. They shall be considered incidental to the work.

Drilling. The injection holes shall be drilled in the following manner. A series of 5/8" holes will be drilled at about six to eight foot intervals through the concrete. The exact location and spacing of the holes shall be determined by the Contractor. The drilling of the holes shall be considered incidental to this item.

Injecting. The hydro-insensitive high density polyurethane foam is then injected under the slab. As the hydro-insensitive high density polyurethane chemically reacts, it expands and hardens, exerting the necessary lifting forces. The amount of rise shall be controlled, using the pumping unit, by regulating the rate of injection of the hydro-insensitive high density polyurethane material. When the nozzle is removed from the hole, any excessive polyurethane material shall be removed from the area and the hole sealed with a non-expansive cementitous grout.

After the hydro-insensitive high density polyurethane material has set, the Engineer will test the surface of the pavement with a 10-foot straight edge placed parallel to the centerline. In no case shall the maximum ordinate from a 10-foot straight edge to the pavement be greater than 1/4-inch. A tight string line may be used to monitor and verify elevations for a slab length of 50 feet or less. For longer sections, a laser level will be used to monitor and verify elevations. Elevations can also be verified by flooding the area to confirm that the paving has been realigned properly.

The Contractor shall be responsible for any pavement blowouts, excessive lifting, and/or uneven pavement, that causes ponding, which is result of the raising of the pavement and shall repair or fix the damaged area to the satisfaction of the County Engineer, without additional cost to Harris County.

Set-time. The hydro-insensitive high density polyurethane foam used shall set and obtain 90% of its ultimate compressive strength within 15 minutes from injection.

Grade Control. Control the final elevations within ¼ in. of the proposed profile elevations. The Engineer may check the treated area to confirm that the pavement has been aligned properly to attain positive drainage.

8104.6 Guarantee. The Contractor agrees to replace, without additional cost to the

County, any Work found to be defective and to make good all damage or other Work caused by such improper placement. The guarantee period for the Work is one year from the date of placement.

8104.7 Measurement. The hydro-insensitive high density polyurethane material shall be paid for by the pound, which will include furnishing and injecting material.

Page -4-

8104.7 Payment. The quantity of material to be paid for shall be the quantity actually used, based on the contract unit price shown on the bid form.

Only Hydro-Insensitive High Density Polyurethane shall be paid for directly.

All other labor, tools, equipment and incidentals including furnishing and operating elevation control devices, drilling of holes; furnishing and installing traffic control devices necessary for the completion of the work shall not be paid for directly, but shall be considered incidental to this item.

The descriptions and units for this item are:

Hydro-Insensitive High Density Polyurethane (Raising/Undersealing Concrete Slabs) lbs

END OF ITEM 8104