Contract 09-332104

The responses to bidder's inquiries, unless incorporated into a formal addendem 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 availability or use of information provided in the responses to bidder's 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.

Q1) Concerning Remove Pavement Marking- is Caltrans requiring the contractor to treat all the removal as if it contains lead? If not then why are we removing all the markings when the roadway is being cold planed?

A1) The cold planing of asphalt concrete other than transition areas is only being done on selected stations in locations 1 and 2 in the number 2 lane. In these areas the pavement marking may be ground and disposed of with the cold planing. The majority of the pavement markings to be removed are not located in areas where cold planing is specified. These pavement markings shall be treated as if they contain lead chromate in average concentrations less than 5 mg/L Soluble Lead or 1000 mg/kg Total Lead in accordance with 10-1.17 REMOVE TRAFFIC STRIPE AND PAVEMENT MARKINGS.

Q2) Special_Provisions_Specific: Comment-LAS has not been used in this area for over 10 years. Lime marination is the usual anti strip method used. Is the wrong standard spec included in the job specs?

A2) Special Provision 10-1.23 LIQUID ANTISTRIP TREATMENT is the correct specification. The asphalt binder shall be treated with liquid antistrip (LAS) to bond the asphalt binder to aggregate in hot mix asphalt (HMA).

Q3) Division of Construction CPD 05-10, Attachment 1 (Division of Design Guidelines, Selection of Asphalt Binder Grade), Table 2.0-Asphalt Binder Grade, dated 11/10/05 indicates use of PG64-28 for Typical, Dense Graded, Conventional Asphalt in the High Mountain/High Desert Climatic Region. The same Table 2.0 indicates PG58-22 for Open Graded Rubberized Asphalt in the same Climatic Region. Is PG64-28 the appropriate binder for the Item?

A3) Per Addendum No. 1, The asphalt rubber binder must be PG 64-16.