Caltrans Office Engineer

Viewing inquiries for 07-252004

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Inquiry #1: Q: Is Caltrans expecting full width PPCP panels or will you accept multiple panels per Case III on sheet C-36?

Q: Many of the cross sections on X-3 to X-8 show a crown or peak in the PPCP. An 8" panel will crack upon release of the strand as the panel tries to straighten. How does Caltrans see these panels being manufactured?

Q: On sheet 32 at Sta 2490+25.9 to Sta 2500+23.36 it appears to show a super elevation transition. Does Caltrans believe that the PPCP panels will be able to follow this transition once post tensioned or will they expect warped or non planar panels?

Q: In the special provisions under "Payments" there is no provision for MOH payments for PPCP. Was this an oversight or does Caltrans expect the contractor/supplier to bear the cost and carry of panels produced and not installed?

Inquiry submitted 03/19/2013

Response #1:A)Yes, Caltrans will accept multiple panels. B) An addendum will be issued to resolve this. C) Yes, Caltrans believes that the PPCP panels will be able to follow the superelevation transition once post-tensioned. Because the panel is only 8 feet long and built flat, the grade along the vertical curve is accomodated by the tranverse joint at each 8 foot increment. D) This is construction administration question. This question can be best answered by the Resident Engineer when the project is in construction. Bid per contract documents.


Response posted 03/26/2013




Inquiry #2: Some of the stations on the layout do not match with Route 405 line. The hatching for the cold plane seems to be off in some places on the layout as well. Will hatching for the coldplaning on the shoulders be provided? The quanities for Roadway Excavation, Remove Concrete, Lean Concrete Base RS and Precast Prestressed Concrete Pavement on the summary of quantities does not match if you take the structural section from the typical sections, please revise and advise on what quantities to use.
Inquiry submitted 03/20/2013

Response #1: No, the hatching for the coldplane and overlay hot mix asphalt on the mainline shoulders will not be provided on the layouts. Please refer to the typical cross section sheets X-1 and X-2 for the limits of pavement work on the mainline shoulders. The typical cross section sheets show a variable thickness on some of the existing and proposed structural sections. Therefore, volume estimates are not necessarily dependent on the typical cross section shown. The variable structural section thicknesses will determine different volumes of Roadway Excavation, Remove Concrete, and LCBRS. Please use the quantities shown in the Q-sheets and bid per contract documents.
Response posted 03/26/2013




Inquiry #3:
Inquiry submitted for Caltrans contract 07-252004 on March 19, 2013.

Q: Is Caltrans expecting full width PPCP panels or will you accept multiple panels per Case III on sheet C-36?

Q: Many of the cross sections on X-3 to X-8 show a crown or peak in the PPCP. An 8" panel will crack upon release of the strand as the panel tries to straighten. How does Caltrans see these panels being manufactured?

Q: On sheet 32 at Sta 2490+25.9 to Sta 2500+23.36 it appears to show a super elevation transition. Does Caltrans believe that the PPCP panels will be able to follow this transition once post tensioned or will they expect warped or non planar panels?

Q: In the special provisions under "Payments" there is no provision for MOH payments for PPCP. Was this an oversight or does Caltrans expect the contractor/supplier to bear the cost and carry of panels produced and not installed?


Inquiry submitted 03/25/2013

Response #1:A)Yes, Caltrans will accept multiple panels. B) An addendum will be issued to resolve this. C) Yes, Caltrans believes that the PPCP panels will be able to follow the superelevation transition once post-tensioned. Because the panel is only 8 feet long and built flat, the grade along the vertical curve is accomodated by the tranverse joint at each 8 foot increment. D) This is construction administration question. This question can be best answered by the Resident Engineer when the project is in construction. Bid per contract documents.


Response posted 03/26/2013




Inquiry #4: In the Special Provision, the first column of traffic control closure Tables A through O is titled, “Slab No. Being Replaced.” The second column of these Tables is titled, “Lane No. Closed.” No numbering convention for the slabs is provided.
QUESTION: Is the reference to “Slab No.” equivalent to “Lane No.?” If not, how are the “Slab No.s” identified?

Inquiry submitted 03/25/2013

Response #1:Yes, the slab numbering convention is equivalent to the lane number.
Response posted 03/26/2013




Inquiry #5: An apparent conflict exists in the bid documents regarding longitudinal joint locations in the PPCP construction.

The Typical Cross Sections sheets showing PPCP (X-1, X-2, X-3, X-4, X-5, X-6 and X-7) do not indicate any longitudinal joints between lanes. This could indicate that the panels are to be fabricated so as to run the full width of the indicated limits for the PPCP as a single multi-lane width panel. Table B on Construction detail sheets C-50, C-51, and C-52 provides quantities for fabricating panels that range from 12 feet to 50 feet wide.

The General Layouts for PPCP on Construction Detail sheet C-36 indicate single lane panels with longitudinal isolation joints between lanes. On C-36, the only panels shown as being wider than a single lane are those with a monolithic shoulder.

Special Provision Section 10-1.15 directs us to use Tables A through O for scheduling the pavement removal and replacement operations. The lane closures permitted using Tables A through O do not allow for complete freeway closure to install PPCP panels as full width multi-lane replacement sections.

QUESTION: Panels with a monolithic shoulder section notwithstanding, are the PPCP panels to be furnished installed as multiple single lane panels (W ≈ 12 ft) with longitudinal isolation joints between each lane? This would be required to conform to the applicable closure Tables but would not conform to paving sections.

Inquiry submitted 03/25/2013

Response #1:A. The typical cross sections do not show longitudinal joints because it is the contractor's option to use single lane PPCP panels or some other fabrication method that is allowable within the traffic control requirements. A longitudinal isolation joint is required at the lane line between adjacent PPCP panels for single lane and/or multiple lane PPCP panels. Sheet C-36 is mainly used to provide general slab layout and is not specific to the project. The addendum that is proposed (see Question #2) will clarify the confusion on longitudinal isolation joints.
Response posted 03/26/2013




Inquiry #6: section 10-1.35 first paragraph under Asphalt Binder states "Asphalt Binder mixed with asphalt modifier and crumb rubber modifier(CRM)for asphalt rubber binder must be PG 64 -10."
Typically the asphalt binder is PG 64 -16 which is all that is mentioned in other sections of the specifications.

Inquiry submitted 03/29/2013

Response #1:There is an Error. It should state PG 64-16 per the materials recommendation dated 1-5-12. It will be corrected by Addendum.
Response posted 03/29/2013




Inquiry #7: We request that Caltrans revisit inquiries 1 and 3 regarding “Payments”. ” Payments for materials furnished but not incorporated in the work is specified within section 5-1.12 of the Special Provisions and should include PPCP as was included on contract (07-202114) which bid in 2012. It is unreasonable for the Department to expect a supplier to provide this material with such large costs without the avenue of payment prior to panels being incorporated into the work. This would not appear to be in line with a State Agencies ability to make payment per Public Contract Code Part 2, Chapter 1, Article 8. Please issue an addendum that adds PPCP within section 5-1.12 “Payment” of the special provisions.
Inquiry submitted 04/04/2013

Response #1:There will be an Addendum#2 that will address the PPCP Spec to be paid under Material-On-Hand.
Response posted 04/04/2013




Inquiry #8: Bidder's Inquiry #7 references that Addendum #2 will be issued for the project. When will this addendum be published? Will the bid date be changed? Thank you.
Inquiry submitted 04/15/2013

Response #1:Addendum #2 has been issued on 4/15/13 to revise plans and set a new bid opening date of 5/30/13.
Response posted 04/15/2013




Inquiry #9: CRack treatment quantity is 75 lnMi. If this applies to AC pavement only, I dont see how we can even come close to this number.

is this a typo, and the quantity should be 7.5 and not 75 LnMi?

Inquiry submitted 04/15/2013

Response #1:Length of project, 39.4/48.6 (9.2 miles), 4 lanes per direction, 36.8 LnMi, 2 directions = 73.6 LnMi; therefore, 75 LnMi is fine for this project. Crack Treatment will cover the entire project limits.


Response posted 04/16/2013




Inquiry #10: After looking at addendum # 2 I noticed that the thickness of the PPCP varies from .67' to 1.14' thick. Question: Can the location of the strand, reinforcing, post tensioning ducts, and keyways be uniformly located in the bottom .67' of the PPCP panels?
Inquiry submitted 04/17/2013

Response #1:No. The distribution should be based on the construction details for the panels found on Construction Detail sheets C-37 to C-44.
Response posted 04/17/2013




Inquiry #11: 1. Are Contractors still permitted to utilize longitudinal joints which would allow the use of single lane PPCP panels as per Caltrans previous response #1A.

2. We have been unable to verify the concrete yardage for the PPCP panels as shown on sheet 126 (Q-1), could Caltrans please detail a typical section through the roadway. For example: The layout on sheets 25 (L-14) and the section shown on Sheet 6 (X-5) northbound 50’ wide indicates a total concrete yardage of 675 yd3. Due to the lack of dimensions we are unable to confirm this yardage.

Inquiry submitted 05/06/2013

Response #1:1. Yes. It is fine to use Longitudinal Joint at certain section of roadway that only one lane can be constructed at a time.

2. For question about PPCP quantity: If you look at each layout, there would be dimensions for width and length of PPCP section. With those dimensions, you can calculate the area. I multiply the area by 0.67' (8" thickness) and divided by 27 to come up with Cubic Yard of PPCP. For the area with the crown, you have to add the additional amount of PCC, according to the length and width. There are sufficient information on the plans to calculate the quantities. Other than that, the numbers on Q-1 are accurate for this project.

Response posted 05/06/2013




Inquiry #12: Caltrans response to inquire #10 states the construction details for panels of various depths are to be found on sheets C-37 to C-44. There are no details on these sheets for the location of strands, reinforcing, post-tension duct, and keyways, for panels of various thicknesses.
Could Caltrans please issue a typical cross section of a varying depth panel showing the location of the strands, reinforcing, post-tension ducts and the keyways?

Inquiry submitted 05/07/2013

Response #1:This inquiry is addressed in addendum #3.
Response posted 05/07/2013




Inquiry #13: regard to crack treatment item, detail on C-13 clearly indicates crack treatment applied only to AC pavement, not PCC pavement. if this is the case, the bid quantity well exceeds the actual quantity by 3X.


Please indicates where on the plan or spec that crack treatment is required on PCC pavement if the bid quantity is to remained at 75 LnMi.


Inquiry submitted 05/08/2013

Response #1:This inquiry is addressed in addendum #3.
Response posted 05/08/2013




Inquiry #14: on item 11 temp soil binder - are all the work areas going to be ready at the same time ? there are no move in -out on bid items . it looks like 10 different work areas from the 101 all the way down to the 5 seperation . alot of area with no move ons . will move ons be added ? . thank you
Inquiry submitted 05/14/2013

Response #1:Item #11, “Temporary Soil Binder”, will be only used at the Permanent BMP construction location(Austin Vault Sand Filter) to stabilize any excavated/stockpiled material. Move-in/out is not required for this type of project. It only applies to Disturbed Soil Area (DSA)>25 acres and more than one “wet season.
Response posted 05/14/2013






The information provided in the responses to bidder inquiries is not a waiver of Section 2-1.03, “Examination of Plans, Specifications, Contract, and Site of Work,” of the Standard Specifications or any other provision of the contract, nor to excuse the contractor from full compliance with the contract. Bidders are cautioned that subsequent responses or contract addenda may change a previous response.