6386 - Supply of Hot Mix Asphalt Concrete, 3.Statement of Work/ SpecificationsRFP # 6386
Technical Specifications
Supply of Hot Mix Asphalt Concrete
EXHIBIT 3
The scope of work and/or technical specifications shall be finalized upon the selection of the Firm. The proposal submission shall have accurately described your understanding of the
objectives and scope of the requested products and services and provided an outline of your process to implement the requirements of the scope of work and/or technical specification
below. It is anticipated that the scope proposal submission will include, at a minimum, the following:
Product Specifications
Sections A & C
Hot Mix Asphalt Concrete Pavement (Texas DOT Item 340)
The fine aggregate shall be processed sufficiently, prior to entering the dryer, so that the shakable material retained on the No. 4 sieve shall not exceed 2%.
A minimum of 20% of the fine aggregated incorporated into the final mixture shall consist of crushed stone screenings.
Representative samples for each grade of material from each aggregate source will be secured at random from aggregate stockpiles. These samples will be subjected to the four (4) cycles
of the soundness test in accordance with test method TEX-411-A. The loss shall not be greater than 30% when magnesium sulfate is used. This test will not apply to materials meeting
the sulfate requirements for coarse aggregates in Item 421.
Crushed stone screenings must be produced from stone, which will comply with the physical requirements, specified for the coarse aggregate under Article 340.2-(1) (A) of the standard
specifications. The crushed stone screenings stockpile may contain a maximum of 35% retained on the No. 10 sieve.
The coarse aggregate shall be crushed so that a minimum of 50 percent of the aggregate retained on the 3/8”, No. 4 and No. 10 sieves shall have more than one crushed face when tested
in accordance with test method TEX-413-A. The crushed faces required for gravel, Article 340.02. (1) (A) paragraph 8 is voided. (No crushed gravel).
The completed mix shall be evaluated by test method TEX-530-C and the amount of uncoated aggregate shall not exceed ten percent. If stripping occurs, the aggregate and/or the asphalt
will be treated with lime slurry and/or approved liquid anti-stripping agent in accordance with special specification item 3373, “Asphalt Anti-stripping Agent (lime)” or Item 3374 “Asphalt
Anti-stripping Agent (liquid).” It shall be the contractor’s options to the type of anti-stripping agent selected. A minimum of one-half percent shall be used with
all mix designs.
A maximum of 15% of field sand shall be used in the mix design. Preferred mixes shall contain 7-10% field sand. See Item 2 for replacement.
The City of Denton will start regular testing of materials at plant site including aggregate samples for LA Abrasion test as described in #3 and #4.
The successful respondent will be required to meet performance specifications as follows:
Twenty-four (24) hour telephone to receive messages. The City will give 12 hours notice of intent to receive and attempt to give six (6) hours notice of cancellation.
Three (3) day response time after vendor is contacted by the City to provide experienced operator with laydown machine.
NOTE: The following are minimums:
Delivery of patching hot mix shall be at the rate of 30 tons over any 8-hour day or 7.5 tons per hour.
Delivery of hot mix for repaving shall be at the rate of 90 tons per hour.
Delivery of hot mix for construction shall be at the rate of 130 tons per hour.
If the successful respondent is unable to meet specifications on a daily basis due to plant failure or other delivery commitments, the City of Denton will have the option to obtain materials
from the second lowest respondent. The Street Patching crew needs Type D hot mix every day.
The successful respondent will provide delivery using the most cost effective trucking for the City of Denton for each of the three types of operations: (a) patching, (b) repaving,
and (c) construction. The average value can be obtained based on historical use and types of projects providing the performance specifications in #9 are met.
The minimum asphalt content for all mixes shall be 3.5 as stated in Texas DOT Specification #340.
Previous contracts have shown little price difference in all types of asphalt. Therefore, the unit price quoted shall provide delivery for Type A, Type B (292), Type C, and Type D hot
mix asphaltic concrete as per Texas DOT Specification #340.
All items must meet or exceed specifications in Texas DOT specification #340.
All items must meet or exceed specifications in Texas DOT specification #300.
All items must meet or exceed specifications in Texas DOT specification #316.
Recycled asphalt pavement (RAP) material may be used per TxDot Item 340.2 in the base course and surface course.
Section B & D
Hot Mix Asphalt Concrete Type C, Surface, PG-76-22 Asphalt Cement, Class A {S,SBS,E,L,CR}.Coarse Aggregates to be used in surface courses shall have a minimum surface aggregate classification
of A, {For Specifics on this Type C (PG-76-22) (Class A), please refer to Texas DOT specification item #3146, item #300, item #340).
All items must meet or exceed specifications in Texas DOT specification #3146.
All items must meet or exceed specifications in Texas DOT specification #300.
All items must meet or exceed specifications in Texas DOT specification #340.
Delivery Districts
The City of Denton will be divided into two (2) delivery districts, North and South. It is the City’s intent to award a contract for the north district, and a contract for the south
district. The goal is to ensure timely delivery on both sides of town and continuity of supply.
The awarded district supplier will be the first contact for deliveries in their assigned district. If they are unable to meet the City’s needs for a specific delivery, the City may
contact the other district supplier to see if they can meet the City’s needs. For example, if the need is in the North district, and that supplier can’t meet the delivery needs, then
the South district supplier may be utilized.
A map of the district lines is attached as Exhibit 4. The dividing line from west to east is along Jim Cristal Road, to Oak Street, to Bell and then to McKinney street. If product
is needed on the dividing line, the South division supplier will be contacted first.
Supplemental Terms and Conditions
The materials provided must meet or exceed the requirements as set forth in the current specifications of the Texas Highway Department for road and bridge construction (Texas DOT).
Authorized personnel shall have access to any supplier’s place of business for the purpose of inspecting merchandise. Tests shall be performed on samples taken from regular shipments.
If products tested fail to meet or exceed all conditions and
requirements of the specifications, the cost of the sample and the cost of the testing shall be borne by the supplier.
Payment will be made within 30 days after (1) applicable tests have been completed and materials are found to meet specifications or (2) the day on which the invoice for the materials
was received.
All items must be F.O.B. delivered to the City of Denton Service Center or job site as directed at the time of the order, unless the City opts to pick up the materials.
A purchase order number should be referenced on all packing/delivery slips, shipping tickets, invoices, etc. Invoices and statements should be directed to:
CITY OF DENTON
ACCOUNTS PAYABLE
215 E. McKinney St.
Denton, Texas 76201