BIDDER'S INQUIRIES & RESPONSES
DISTRICT 11 CONSTRUCTION


CONTRACT NO: 11-266104
ROUTE / PM 11-SD,Imp-8-R0.0/R10.0
LOCATION In San Diego And Imperial Counties From San Diego County Line To Route 98/8 Separation.
DESCRIPTION Rubberized Hot And Warm Mix Asphalt Pavement Rehabilitation.
CONTRACT TYPE A + B Bidding
ESTIMATE $11,900,000
WORKING DAYS

260

ADVERTISE DATE 09/26/2011
BID OPENING 11/10/2011
LAST POSTING
11/09/2011@ 15:00

Bid Summary

The Caltrans District 11 Office is located at 4050 Taylor Street, San Diego, CA 92110. The District 11 Duty Senior telephone number is (619) 688-6635. Please submit all inquiries in the proper format by fax to (619) 688-6988 or e-mail to:
Duty_Senior_Const_District11@dot.ca.gov.
The responses to bidder' inquiries, unless incorporated into a formal addenda to the contract, are not a part of the contract and are provided for the bidder's convenience only. In some instances, the question and answer may represent a summary of the matters discussed rather than a word-for-word recitation. The responses may be considered along with all other information furnished to prospective bidders for the purpose of bidding on the project. The availability or use of information provided in the responses to bidder' inquiries is not to be construed in any way as a waiver of the provisions of Section 2-1.03 of the Standard Specifications or any other provision of the contract, the plans, Standard Specifications or Special Provisions, nor to excuse the contractor from full compliance with those contract requirements. Bidders are cautioned that subsequent responses or contract addenda may affect or vary a response previously given.
Caltrans District 11 Construction Department has developed this method of answering Bidder's Inquiries to better serve the needs of the Contractors who bid on our Projects. Caltrans District 11 Construction Department will post all of the questions submitted by any of the contractors that are registered Planholders for that Contract, but reserves the right to not answer any questions deemed unsatisfactory for public viewing.
The BIDDER'S INQUIRIES & RESPONSES will be updated continuously and all attempts will be made to do the final posting by 15:00 on the day prior to the bid opening.


INFORMATION AVAILABLE

 

BID ITEMS
 SPECIALS
PLANS
 PLANHOLDERS

 




ORDERING PROJECT PLANS AND SPECIFICATIONS   


5% UDBE Requirement * Cost per set: Bidders: $E-ad, Non-bidders: $E-ad

ADDENDUM



 

BIDDER'S INQUIRY SUBMITTAL FORM


Inquiry No.
Inquiry

   1

  Q:09/27/11
R:10/11/11
R: 10/19/11

Plan Sheet / Specification Reference= Special Provision Section 10-1.19: Cold Plane Asphalt Concrete Pavement (Page 68)

Question= This specification indicates that the contractor shall schedule cold planing activities to ensure hot mix asphalt (HMA) is placed over cold planer area during the same shift before opening to traffic. The process as decribed in the plans is to cold plane, install asphalt-rubber seal coat and then overlay with either RHMA-G or RWMA-G. There is no (HMA) that is placed after cold planing. Will this specification apply to this project? Will Caltrans require all operations described above to occur within the same traffic window prior to opening to traffic or can the contractor cold plane and cover with asphalt-rubber seal coat prior to opening to traffic and install the RHMA or RWMA at a different time in the project? This has a large impact on the durtion of days bid by the contractor.

  • Your inquiry has been received and is being reviewed.  Thank you for your patience.
  • During each work shift, all areas that have been cold planed shall be covered with asphalt rubber seal coat and RHMA/RWMA, as shown on the plans, during the same work shift.  Traffic shall not be allowed on the cold planed surface or asphalt rubber seal coat.

  2

  Q:10/05/11
R:10/11/11
R: 10/19/11

Plan Sheet / Specification Reference= The 'Special Notices' for this project state 'work includes producing and placing rubberized hot mix asphalt (gap graded) and constructing on control section of RHMA-G and four test sections of RHMA-G mixed with different warm mix asphalt additives'.

Question= If this project has been developed to evaluate warm mix asphalt why are only 'approved' products being specified? Will the foaming plants (Astec and Gencor) be permitted on this project? This would be a great opportunity to evaluate and test this technology.

  • Your inquiry has been received and is being reviewed.  Thank you for your patience.
  • Only approved products will be allowed for this project.

  3

  Q:10/05/11
R:10/11/11
R: 10/19/11
R:  11/04/11

Plan Sheet / Specification Reference= Section 10-1.22 Construction - RHMA-G with WMA additive production and placement:

Question= This section states 'produce an asphalt mixture within the temperature range of 220 degrees F and 240 degrees F'. How will this be accomplished when the RHMA-G requirements for the mixing temperature of the asphalt rubber binder must be between 375 degrees F and 425 degrees F and the compaction temperature of the combined mixture must be between 290 degrees F and 300 degrees F? In addition, temperature for the testing the viscosity of the rubber blended oil is 375 degrees F. How is the supplier to lower the temperatures of the WMA to 220 and 240 degrees F with these requirements? Will there be an amendment to the specifications addressing these requirements?

  • Your inquiry has been received and is being reviewed.  Thank you for your patience.
  • An addendum is forthcoming to address the temperature issues.
  • Please see Addendum #1

  4

  Q:10/06/11
R:10/11/11
R: 10/19/11
R:  11/04/11

Plan Sheet / Specification Reference= Section 10-1.22 Construction - RHMA-G with WMA additive production and placement

Question=

1. Specification does indicate what will the lay down temperature range be for the WMAR. Will the lay down temperature range be provided? Will the laydown temperature range change to WMA process/additive?

  • Your inquiry has been received and is being reviewed.  Thank you for your patience.
  • An addendum is forthcoming to address the temperature issues.
  • Please see Addendum #1

2. How do you have a "Pilot" project with firm specifications? Isn't the idea to see if it works with higher and lower temps and to experiment to some degree under the State's direction?

  • Your inquiry has been received and has been noted.  Please bid per the contract documents.

  5

  Q:10/12/11
R:10/12/11
R: 10/19/11

Plan Sheet / Specification Reference= 20-ASPHALT RUBBER BINDER

Question= Since Warm Mix Asphalt Rubber is being used for the Hot Mix, would Caltrans entertain the idea of using Warm Mix in the Asphalt Rubber for the chip seal portion of work?
 

  • Your inquiry has been received and is being reviewed.  Thank you for your patience.
  • Warm mix will not be allowed in the asphalt rubber for the chip seal.
 6
  Q:10/28/11
R: 10/28/11

Plan Sheet / Specification Reference= 10-1.22 Rubberized Hot Mix Asphalt (Gap Graded) With Warm Mix Asphalt Technologies, 10-1.23 Rubberized Hot Mix Asphalt (Gap Graded), and 39-1.03 Hot Mix Asphalt Mix Design Requirements

Question= Is the intent to perform a unique mix design and JMF verification for each of the four WMA technologies and the RHMA for a total of five mix designs and five JMF verifications?

  • Mix designs for WMA are done independent of the additive. One JMF would cover all the R-HMA mixes, with or without additive.       
 7
  Q:10/28/11
R: 11/04/11

Plan Sheet / Specification Reference= 10-1.22 Rubberized Hot Mix Asphalt (Gap Graded) With Warm Mix Asphalt Technologies, 10-1.23 Rubberized Hot Mix Asphalt (Gap Graded), and 39-1.03 Hot Mix Asphalt Mix Design Requirements

Question= The final draft Caltrans WMA specification includes the following, “Prepare samples in accordance with California Test 304. Cure samples in a forced air draft oven at 275 °F for 4 hours +/- 10 minutes.”  Should this be included in sample preparation for this project?

  • Please see Addendum #1.        
 8
  Q:10/28/11
R: 10/31/11

Plan Sheet / Specification Reference= 15 Remove Asphalt Concrete Dike, 28 Place Hot Mix Asphalt Dike

Question= In areas where existing asphalt concrete dike abuts rock, is the state willing to leave the dike in place?
         

  • No. Please bid per the contract documents.
 9
  Q:10/31/11
R: 10/31/11
R:  11/04/11

Plan Sheet / Specification Reference= Pages 55-57 of the Special Provisions.

Question= The traffic charts on Pages 55-57 of the Special Provisions indicate that all freeway lanes and ramps must be open during certain portions of the mornings and evenings. Due to the remote job location and nature of the work, would the State allow 24 hour lane/ramp closures?
         

  • An addendum is forthcoming to revise the hours.
  • Please see Addendum #1
 10
  Q:11/01/11
R: 11/09/11

Plan Sheet / Specification Reference= 6-1.085 Buy America.

Question= Since this project is subject to Buy America requirements, will aggregate produced in and imported from Mexico be allowed to be incorporated within the project or will the only allowable aggregate be that which is produced in the United States?
         

  • Aggregate produced in and imported from Mexico is considered an "off-the-shelf" item and is not subject to Buy America requirements and will be allowed on this project.
 11
  Q:11/01/11
R: 11/03/11

Plan Sheet / Specification Reference= Item #38- Chain Link Fence (TypeCL-4, Vinyl-Clad)4720 LF

Question= (1)Construction Details Sheet C-5 shows a detail of Chain Link Fence with 2 truss rods in between the posts. Posts are noted to be 8' apart maximum with a 2 3/8" Schedule 40 pipe sleeve in the post footing. The question is: will this 8' fence section be representative of the entire fence line or is it only in certain sections of the fence?

  • Yes, the 8' fence section applies to the entire length of the fence.

(2)Would it be possible to get some sort of layout for the fence?
 

  • No, layout will not be provided.
 12
  Q:11/01/11
R: 11/03/11

Plan Sheet / Specification Reference= 39-1.03E

Question= Specifications Section 39-1.03E states that the Engineer verifies the JMF from samples take from HMA produced by the plant to be used. Please verify that

a. one JMF is required for RHMA-G
b. one JMF verification will be required for RHMA-G
c. no separate JMFs or JMF verifications will be required for asphalt produced with warm mix technologies

  • Mix designs for WMA are done independent of the additive. One JMF would cover all the R-HMA mixes, with or without additive.      
 13
  Q:11/02/11
R: 11/03/11

Plan Sheet / Specification Reference= Item 28 Place Hot Mix Asphalt Dike, Sheet 26

Question=Where new AC Dike is to be installed-Will shoulder backing be required? if so, how will this work be paid? 

  • Yes, dike backing will be required in accordance with Standard Plan A87B.  Payment for backing is included in the Item 28 per Section 39-5.02 "Payment".
 
 14
  Q:11/04/11
R: 11/04/11

Plan Sheet / Specification Reference=

Question= Will the contractor be required to verify the JMF five times including four times with the warm mix additives?

  • One JMF will cover all of the R-WMA mixes since the mix designs for WMA are done independent of the additive.  This JMF will only need to be verified once.
   

 


OTHER LINKS OF INTEREST

DISTRICT 11 CONSTRUCTION BIDDER'S INQUIRIES & RESPONSES
DISTRICT 11 HOMEPAGE
CALTRANS OFFICE ENGINEER: Contract Advertisement, Special Provisions, Plan Holders, Contract Awards, etc.
DEPARTMENT OF TRANSPORTATION