California Department of Transportation
 

Contract 10-1A0704

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) Are cross sections available on the project? If yes, how can we get them?

A1) Cross sections are available from Stockton Blue Reprographics, 1421 N. El Dorado St., Stockton, CA 95202; phone (209) 464-8724, fax (209) 464-8739, E-mail: Don@stocktonblue.com.


Q2) Will a flow analysis be required for the temporary falsework that will be left in the floodway during the construction of the bridge.

A2) Please refer to Section 5-1.24, "Relations With State Reclamation Board," of the Special Provisions, which states "Other than the new falsework columns and platforms under the new Merced River Bridge (Br. No. 39-0071), no stockpiles of material, temporary buildings or equipment shall remain in the floodway during the flood season from November 1st to July15th." If the Contractor proposes changes to these conditions, the State Reclamation Board may require a new flow analysis.


Q3) Can the Contractor perform work during the months of November 1 thru July 15 on the bridge as long as no materials or temporary buildings are stored in the floodway and equipment is move in and out of the floodway each shift.

A3) Refer to Section 7-1.04, "Permits and Licenses, of the Standard Specifications, which states "In the event that the Department has obtained permits, licenses or other authorizations, applicable to the work, in conformance with the requirements in the Environmental Quality Act, the Contractor shall comply with the provisions of those permits, licenses and other authorizations." Special Condition Twenty-Three of The Board of Reclamation Permit No. 18126 GM, dated December 4, 2006 (included in the Information Handout for this contract), states "No construction work of any kind shall be done during the flood season from November 1 to July 15."


Q4) Special Condition Twenty-four of the Reclamation Board Permit (18126 GM) states no construction work of any kind can be done during the flood season without prior approval of the Reclamation Board. Has Caltrans received this approval from this agency. If not, does this apply to any construction on the entire project. Please clarify this blanket statement.

A4) The location of the Merced River Bridge (Br. No. 39-0071) is within the Merced River Designated Floodway, an area controlled by The State Reclamation Board. Therefore, as stated in Special Condition Twenty-Three of Permit 18126 GM, "No construction work shall be done during the flood season from November 1 to July 15 without prior approval of the Reclamation Board," refers to that area. Refer also to Section 5-1.24, "Relations with State Reclamation Board," of the Special Provisions, which states "Attention is directed to the conditions in the application that have been approved by the Reclamation Board for this project.” This refers to the conditions listed in the permit.


Q5) PILE CUT-OFF ELEVATION IS APPROXIMATELY 5 METERS BELOW THE WATER TABLE. THE GROUND WATER PRESSURE MAY CAUSE THE LIQUID PILE CONCRETE TO WASH OUT. EITHER THE CUT-OFF ELEVATION HAS TO BE RAISED OR A PERMANENT CASING HAS TO BE PLACED. PLEASE REFER TO CALTRANS MEMO TO DESIGNERS 3-1 DATED DECEMBER 2000, "WHEN CONTEMPLATING CIDH PILES IN THE WET, CAUTION SHOULD BE EXERCISED IN THE FOLLOWING CASES:... HIGH GROUND WATER TABLE THAT WILL PRECLUDE ESTABLISHING A DIFFERENTIAL WATER PRESSURE HEAD FOR SLURRY CONSTRUCTION. DRIVEN PILES SHOULD BE CONSIDERED FOR THESE SITUATIONS."

A5) Refer to Addendum No. 1, dated August 24, 2007.


Q6) PAGE 204 OF THE SPECIAL PROVISIONS STATES, "DURING EXCAVATION FOR ABUTMENT 1, PIER 2 AND PIER 4 FOUNDATIONS , PREVIOUSLY ABANDONED BRIDGE FOUNDATION MATERIAL MAY BE ENCOUNTERED." THERE ARE NO MEASUREMENT OR PAYMENT PROVISIONS DEALING WITH THESE FOUNDATIONS. CAN THE CONTRACTOR ASSUME THAT HE WILL BE COMPENSATED FOR DEALING WITH THESE BURIED MAN MADE OBJECTS AT FORCE ACCOUNT?

A6) Refer to Addendum No. 1, dated August 24, 2007.


Q7) There is no section in the special provisions covering "Lime Treated Aggregates."

A7) Refer to Addendum No. 2, dated September 4, 2007, which deletes the third paragraph of Section 10-1.34, "ASPHALT CONCRETE," of the Special Provisions.


Q8) The Summary of Quantities show 11,400 m3 of roadway excavation between Sta 303+71 – 305+49. Profile Plan Sheet P-1 suggests the quantity is generated by widening the existing floodway. However, it references the bridge plan for work within these station limits and the bridge plan shows only a small amount of excavation around Abutment 5. Question: Can a contour grading plan or other information be made available to help us quantify and more precisely locate this excavation?

A8) An Addendum #1 was prepared in Headquarters on August 23, 2007 and will be posted on the internet by August 27, 2007 addressing these questions.


Q9) The only reference we are able to find in the plans and specifications for Bid Item #41 – 600 mm Alternative Culvert is on Cross Section Plan Sheet X-1. The stationing dictates that the conduit goes through the bridge. However, the bridge plans show only a blockout for a future utility and no other details. 1] Is the conduit to be supported by pipe cradles set on the bridge soffit? 2] What type of alternative conduit materials are allowed? (e.g. steel, plastic, etc.) 3] What type of end treatments are required for the conduit?

A9) An Addendum #1 was prepared in Headquarters on August 23, 2007 and will be posted on the internet by August 27, 2007 addressing these questions.


Q10) We are unable to find any information regarding Bid Item #29 – Removal Asbestos Containing Material other than the general information given in Special Provision Section 5-1.06 which states that asbestos removal, including exploratory work, will be performed by separate contract.

A10) An Addendum #1 was prepared in Headquarters on August 23, 2007 and will be posted on the internet by August 27, 2007 addressing these questions.


Q11) IF THE CONTRACTOR HAS HIS FALSEWORK INSTALLED PRIOR TO NOV. 1, AND AS LONG AS HE DOESN'T ENTER THE "FLOODWAY" (IT IS ASSUMED THAT THE ELEVATION OF THE SOFFIT IS ABOVE THE "FLOODWAY"), WILL HE BE ALLOWED TO CONSTRUCT THE BRIDGE ON THE FALSEWORK AFTER NOV 1.?

A11) See response to Question #3. Refer also to Section 5-1.24, "Relations With State Reclamation Board," of the Special Provisions, which states "Changes in the above listed conditions proposed by the Contractor shall be submitted to the Engineer for transmittal to the State Reclamation Board for approval. Changes shall not be implemented until approved in writing by the State Reclamation Board."


Q12) PLEASE EXPLAIN THE INTENT/DIFFERENCE IN MEANING OF THE LAST TWO PARAGRAPHS OF SECTION 5-1.24.

A12) Please refer to Addendum No. 1, dated August 24, 2007.


Q13) Reference Item No. 29, "Removal Asbestos Containing Material." What is this work?

A13) Please refer to Addendum No. 1, dated August 24, 2007, which has revised the Engineer's Estimate. Note that Item No. 29 has been deleted.


Q14) Although There are Traffic Windows and References to Maintaining Traffic how come there is no Traffic Control Item in the bid schedule??

A14) Refer to Addendum No. 1, dated August 24, 2007, which revised the Engineer's Estimate. Note that Item No. 75 is for "Traffic Control System."


Q15) The bid item (40) is for a NPS-2 Water Line. However if you go to plan sheet 67 of 78 it shows two NPS 2 lines running through the culvert of the bridge, this refers to standard detail B14-4. B14-4 shows NPS-2 water lines on supports going throug the box girder. However if you go to sheet 70 of 78 it shows a NPS-8 water line with hangars and expansion couplings. Which water line is correct??? Which detail is to be referred to?? And why is there not a NPS-8 bid item???

A15) Both lines are correct, both details shall be referenced. Reference Sheet 64 of 78, "Elevation" detail. 2 - NPS 2 supply lines are shown and near by the center line of the NPS 8 drainage piping is also shown. Please also reference sheet 68 of 78 "Girder Layout" detail which shows the pipes in plan view. Reference plan sheet 70 of 78 and section 10-1.48 "Bridge Deck Drainage System" of the contract special provisions. NPS 8 drainage piping is part of the Bridge Deck Drainage System and is not a separate bid item.


Q16) Plan sheet 52 indicates 2 each 41c, and 1 each 78c conduits are required on each side of the bridge. Plan sheet 67 indicates 3 each 53c and 2 each 78c conduits are required on each side of the bridge. Please clarify.

A16) Refer to Plan Sheet No. 67, revised per Addendum No. 1, dated August 24, 2007. This revised plan indicates one 78C and two 41C conduits, typical.


Q17) Section 4, "Beginning of Work, Time of Completion, and Liquidated Damages," of the Special Provisions, states that "The work (including plant establishment) shall diligently be prosecuted to completion before the expiration of 375 WORKING DAYS." Sub-section "Plant Establishment Work" of Section 10-2.04, "Highway Planting," states that "The plant establishment period shall be Type 2 and shall not be less than 250 working days." Is plant establishment to begin 125 working days after contract begins?

A17) Refer to Section 20-4.08, "Plant Establishment Work," of the Standard Specifications which states, in part, that "Type 2 plant establishment period shall be the time between completion of all planting work and acceptance of the contract." Therefore, it is intended that plant establishment will begin 125 working days or sooner after contract work begins.


Q18) With full length main column reinforcement cages installed at Piers #2, #3 and #4, would it be permissible to place C.I.D.H. Pile concrete in one continuous operation from specified pile tip elevation to provided working grade surface?

A18) The CIDH piles at bents 2, 3 and 4 shall be poured continuously from the tip elevation to cutoff elevation. Please bid per current contract documents.


Q19) In Standard Spec’s 86-2.05D an expansion fitting shall be installed where the conduit crosses any expansion joint; but it references different types of fittings for different applications. In the special specifications “Standard Plan List” it references Sheet ES-9B, which shows the several different types of fittings; but in Section 10-3 “Signals, Lighting and Electrical Systems there is no specification as to what type of fitting if any. On sheet 52 of 78 (E-1) there is nothing showing where these fittings are installed, if any. Are expansion fitting’s required? If so what type and where.

A19) Yes, "expansion fittings shall be installed where the conduit crosses any expansion joint in the structure," as stated in Section 86-2.05D, "Expansion Fittings," of the Standard Specifications. Refer to "Detail X" on Standard Plan ES-9B.


Q20) The combined configuration of the C.I.D.H. Pile reinforcing steel main (exterior)cage and the column steel cage provide insufficient clearance to allow proper flow of concrete through the multiple layers of reinforcing steel to the exterior of the shaft.In addition, there is insufficient space between the column cage reinforcing and the main (exterior)C.I.D.H. reinforcing cage to install the PVC inspection tubes if you allow for construction tolerances. It is also recommended that the concrete cover on the exterior reinforcing be a minimum of 5 inches and not the 3 inch minimum indicated on the plans. The C.I.D.H. Piles if installed as currently designed will most likely result in an inferior product with inherent defects/anomalies in the concrete and will adversely affect pile constructability resulting in delays to the project. We therefore request that Caltrans strongly consider redesign of the C.I.D.H. Piles with a focus on constructability.

A20) The current design is sufficient. Please bid per current contract documents.


Q21) It is requested that any unknown manmade obstructions be paid per force account and not be included in the price of the work. If Caltrans cannot define the extent or amount of the obstructions to be encountered, then how can the Contractors properly assess cost and time impacts associated with something that is unknown to all ? Reference Caltrans response Addendum No.1 Page 2 MEASUREMENT AND PAYMENT (PILING.)

A21) Refer to Addendum No. 2, dated September 4, 2007.


Q22) Would installation at all Pier locations of permanent steel casing extending 5 ft. below bottom of column reinforcing cage combined with a cold joint be permitted?

A22) The current design is sufficient. Please bid per current contract documents.


Q23) On the replacement bridge structure 39-0071, can the Contractor install a construction joint in the foundation CIDH piles at Piers 2-3-4, at approximately 6 meters below cut-off, so as to facilitate pile reinforcement construction requirements?

A23) The current design is sufficient. Please bid per current contract documents


Q24) On the replacement bridge structure 39-0071, can the contractor install permanent steel casing from pile cut-off to approxumately 1.5 meters below above proposed construction joint?

A24) The current design is sufficient. Please bid per current contract documents.


Q25) Will a permanent CMP or smooth wall casing/pipe be allowed to be left in place at ALL pier locations?..and if so..without modification to CIDH pile length?

A25) The current design is sufficient. Please bid per current contract documents.


Q26) If permanent pipe allowed, will a CJ (construction joint) at the bottom of column cage embed be allowed?...this, to allow the setting and pouring of the CIDH pile cage first, then a second operation to set the column cage and pour the balance of the CIDH pile in the "dry".

A26) The current design is sufficient. Please bid per current contract documents.


Q27) Lastly, With above items allowed, the balance of the CIDH pile would be poured in the dry and visable (not under fluid). Therefore, no need to install PVC tubes and Gamma-Gamma test this upper area of the CIDH pile as the portion of the CIDH pile below the construction joint, most likely done 'wet' under a fluid head. Is this true?

A27) The current design is sufficient. Please bid per current contract documents.


Q28) The response to bidder's inquiry Q17 states that Plant Establishment work will begin 125 working days or sooner after the contract work begins. If water supply lines are to be installed in the bridge, and the replacement bridge has not been completely constructed within 125 working days after the contract work begins, how will this affect the plant establishment period?

A28) Please bid in accordance with the contract plans and specifications. If changes are necessary, they will be handled by proposed Contract Change Order.