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Inquiries for Project 04-0120T4

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CONTRACTOR'S INQUIRY RESPONSES

October 23, 2012

CONTRACT NO. 04-0120T4
Construct Bridge, Roadways, Electrical, Buildings And Remove Bridges
County Route: SF-80-12.6/13.9

 

The responses to contractors' inquiries, unless incorporated into a formal addenda to the contract, are not a part of the contract and are provided for the contractor'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 contractors' 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, and any such subsequent response or addenda should be taken into consideration when submitting a bid for the project. Inquiries submitted within seventy-two (72 ) hours of the bid opening date might not be addressed.

The Caltrans District 4 Office is located at 111 Grand Avenue, Oakland, CA 94612. Send Contractor Inquiries via email to the Duty Senior at Duty_Senior_District04@dot.ca.gov. The mailing address is P.O. Box 23660, Oakland, CA 94623-0660. The Duty Senior's telephone number is (510) 286-5209. All inquiries must include the contract number.

During the days from 10/16/12 to 10/23/12, new or updated responses were provided for the following Inquiries #
35 , 125 , 130 , 131 , 132 , 133 , 134

Total Number of Inquiries: 134

Inquiry Index
20 | 40 | 60 | 80 | 100 | 120

Inquiry No. Inquiry Response

1.0

Has consideration been given to an RFQ process to bid the project? In other words, pre qualify before the bid documents are released?

The current project schedule does not allow for implementation of an RFQ process. An RFQ process is not being considered for this project.

2.0

Can the questionnaire be made available now?

The PRE-AWARD QUALIFICATIONS QUESTIONNAIRE (PAQQ) is included in the Bid Book. Please see section 2-1.04 of the special provisions.

You can download a copy below:

3.0

I vote for a stipend.

A stipend has been provided in the 0120T1 project. Please see section 10-1.33 "BIDDERS COMPENSATION" in the special provisions.

4.0

Would you provide a complete copy of the pre-award questionnaire (PAIQ) Available now? So bidders can review and develop teaming if required.

See response to Bidder Inquiry #2.

5.0

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  • Would you make the various "OLD" Dwgs available electronically available January 1, 2012 allowing Contractors/Engineers more time, rather than only after advertisement.

    The old drawings are available. Please see "INFORMATION AVAILABLE FOR INSPECTION" in section 5-1.13 "SUPPLEMENTAL PROJECT INFORMATION" of the special provisions.

    6.0

    Caltrans mentioned that a stipend could be considered for this project. Based on the information provided, a stipend would be appropriate. A stipend of $500,000 for the top 3 or 4 bidders would be consistent with industry practice.

    A stipend of $300,000 is provided for the second lowest, third lowest and fourth lowest bidders. See section 10-1.33 Bidders Compensation of the special provisions.

    7.0

    As-built & shop drawings. I have only seen as-built design drawings& if shop drawings exist, they would be immensely helpful because they contain more detail on weights, connections, lacing, etc.

    As-built information is provided in the the Information Handout, section 5-1.13 Supplemental Project Information of the special provisions. Additional as-built information, including as-built shop drawings will be made available to the bidders in an upcoming addendum.

    8.0

    Can the engineers' qualifications be determined in advance of the bid? This way the contractor won't go all the way to bid only to find out their 2 licensed engineers do not meet the specific requirements. (I find the 3 demo plus 1 truss bridge demo experience too onerous)

    The current project schedule does not allow for implementation of a pre-qualification process. A pre-qualification process is not being considered for this project.

    9.0

    Does the lead cutting need to be fully shrouded?

    The contractor must use methods that ensure lead-related work and containment of lead-containing debris complies with all state and federal laws. The methods to achieve compliance are not specified.

    10.0

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  • What are the SWPPP restrictions in winter vs. summer?

    Under the Statewide Construction General NPDES Permit there is no difference in the SWPPP regulations between winter and summer.

    11.0

    What are the noise restrictions with the Coast Guard?

    See section 5-1.16, SOUND CONTROL REQUIREMENTS, of the contract special provisions.

    12.0

    Will the asbestos potential be identified?

    Due to access restrictions, the contractor will inspect the portion of the bridge currently under traffic. Removal of asbestos-containing material found during the inspection or uncovered during demolition will be done as extra work. See section 10-1.57, "SAMPLING AND REMOVAL OF ASBESTOS-CONTAINING MATERIAL," of the special provisions.

    13.0

    Are there locations with contaminated soil on YBI?

    Contamination zones and limits of contaminated contract item work are shown on construction details in the plans. Site investigation report is provided as supplemental project information.

    14.0

    Due to the need for significant pre-bid engineering, we recommend that the stipend be increased to $750,000

    A stipend of $300,000 is provided for the second lowest, third lowest and fourth lowest bidders. See section 10-1.33 Bidders Compensation of the special provisions.

    15.0

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  • Will Caltrans be processing submittals within 7 days?

    Caltrans will review the submittals within the allowable time stated in the specifications. However, reasonable effort will be made to complete the review of submittals earlier than the allotted time, if possible.

    16.0

    Will Caltrans define the criteria that is to be used for the dismantling or will contractors be required to develop this? If we develop, will Caltrans have to approve?

    The allowable stresses for the existing structural steel to be used for analysis of the existing bridge are shown on the plans.

    17.0

    Will the dismantling design follow the typical Caltrans design process of 65%, 95%, 100%?

    No. Only 100% submittals are required. However, the Engineer will be available to provide imput during the design process, if requested by the Contractor.

    18.0

    Will Caltrans provide a condition report of the main members of the cantilever?

    In addition to as-built information, cantilever truss inspection reports and eye-bar condition survey are provided in the Information Handout. See section 5-1.13 Supplemental Project Information of the special provisions.

    19.0

    Workshop slide for "Responsive Bid" says the bid plans need to be signed by the designer and checker. Does that mean the bid plans are at 100%?

    The plans to be submitted with the bid must conform to the requirements in section 2-1.03 Submittals With Bid of the special provisions. The plans must include all the required items and must be complete and detailed enough to demonstrate a clear path to demolition.

    20.0

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  • Will Caltrans be providing the analysis model to all contractor designer teams? This data could be provided "for information only" and for the designer to verify it themselves.

    Calculating section properties of built-up steel sections is time consuming and it will help to minimize the analysis effort for all teams in this fast track project.

    No. An analysis model is not available. The lengthy advertising period is provided to allow completion of the required pre-bid engineering work.

    21.0

    What are Caltrans insurance requirements for independent check engineer.

    The Contractor must procure and maintain insurance covering all his operations as required in section 7-1.12B Insurance of the special provisions. There are no separate insurance requirements for the independent check engineer.

    22.0

    What is estimated, budget, duration of demolition?

    See "NOTICE TO BIDDERS" section in the advertised "Notice to Bidders and Special Provisions" book. Also, see the special provisions, Section 4, for Time + Cost bidding requirements.

    23.0

    Is the 3 demolition & truss experience consistent with the unique deconstruct analysis with QA calculations, etc.?

    The engineer and check engineer qualifications criteria has changed. See special provisions Section 2-1.03 "Submittals With Bid" and Section 10-1.58 "Bridge Removal, Portion (Cantilever Truss)" in Addendum #3.

    24.0

    Proposed stipend ($300,000) does not seem sufficient given high engineering analysis (deconstruct of cantilever) requirements.

    The stipend provided in the special provisions is $300,000. The Department recognizes that this amount may not cover the entire cost of bid preparation. There is no consideration of raising the stipend amount at this time.

    25.0

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  • Refer to the Cantilever Truss Removal Sequence shown on the plans. Does the lower deck have to be removed prior to steel removal or can it be removed concurrently with the steel truss removal?

    The removal sequence has been revised. See Addendum #1.

    We will consider revising the removal sequence to allow removal of the lower deck concurrent with the steel truss removal. Additional changes to the removal sequence are contemplated. An addendum will be forthcoming.

    26.0

    The specified maximum "B" time and area availability are inconsistent and potentially create an unfair advantage for some contractors. Will Caltrans consider having the "B" time start when the work areas are available to all potential bidders?

    See Addendum 1.

    Under evaluation. An addendum may be requested in order to address this inquiry.

    27.0

    Will access on the existing bridge from Oakland be available longer than 1 year?

    Yes. See Addendum1.

    Yes. An addendum will be requested to address this inquiry.

    28.0

    How do we get access to AsBuilts?

    Asbuilts are available by submitting a written request on company letterhead and shall include the information requested, the purpose for the information (include contract or permit numbers), and contact information.

    The Contractor shall also provide photo identification and complete and sign a "Confidentiality Agreement Form." The Confidentiality Agreement form can be downloaded below -
    http://www.dot.ca.gov/hq/esc/confidentiality_agreement.pdf

    Contractor may email the Confidentiality Agreement form, photo id and the written request as attached pdf files to the Duty Senior at duty_senior_district04@dot.ca.gov.

    Upon approval, the contractor will be contacted with instructions on how to access the asbuilts.

    29.0

    Will Caltrans have a pre-bid meeting? When?

    The Bidder's Conference is scheduled for Thursday, June 14, 2012, from 10:00 a.m. to 3:00 p.m. The location is Casa de la Vista, 271 Avenue of the Palms, Treasure Island, San Francisco, CA.

    See the revised " Notice to Bidders" in Addenum No.1.

    Expect an addendum to change the date from May 10, 2012 to June 14, 2012.

    30.0

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  • Is it possible that the Engineer and Check Engineer qualifications will be reconsidered? It seems that many engineers have the technical skills and experience to analyze a truss bridge and develop a dismantling program in conjunction with a qualified contractor, but that the requirement for having performed "one demolition of a large steel truss bridge" may limit the number of engineers available to the bidders. In addition, given the large amount of time and effort involved in preparing the bid, would you please provide definitions of the word "large" (how large and how long is important as the Bay Bridge is rather unique in this regard), and the word "demolition". Based on the outreach meetings, it seemed that Caltrans was looking for experience with sequenced precision dismantling of old structures (under load with archaic materials in perhaps less than original condition) and not demolition of these structures (i.e. semi-controlled and planned).

    See Response to BI #23.

    31.0

    Are Truss Shop Drawings for Span 49 available?

    Shop drawings for the South-South Detour Viaduct structure have been made available. This includes shop drawings for spans 48, 49, 50, and 51. Please reference the file "Contract 04-0120R4 YBI South South Detour Viaduct Bridge 33_0006 (Temp) Shop Drawings.pdf." The shop drawings for span 49 begin on sheet 263 of 1036. See "INFORMATION AVAILABLE FOR INSPECTION" in section 5-1.13 "SUPPLEMENTAL PROJECT INFORMATION" of the special provisions.

    32.0

    Sheet no. 649 of 821 (Removal of Temporary EB On-ramp) shows the removal of the T7 line; which includes the abutment, soldier pile wall, bent and deck. The notes on sheet no. 649 reference the As-built drawings for the details not shown. The included As-builts do not include the details regarding these structures. We were able to find information regarding the bent and deck (for T7 line removal) in the contract drawings for Project 04-0120S1 but still could not find information regarding the abutment or soldier pile wall.

    Please provide details for the abutment and soldier pile wall.

    See bidder's attachment here (http://www.dot.ca.gov/dist4/construction/contracts/04-0120T4/Attach_BI32.pdf).

    See attached for asbuilts from the R4 contract for the Temporary EB On Ramp abutment.

    33.0

    Can you provide the East Tie In Superstructure Shop Drawings with summary table of member sizes & total weights? This information is missing from the Contract Documents and the Electronic Package.

    All available shop drawings for the East Tie In have been provided. Additional shop drawings are not available.

    34.0

    Is it Caltrans intent to relax or change the Cantilever Bridge Demo Engineers qualification? It seems that lowering or relaxing engineering qualifications is unnecessary since our extensive research on engineering firms indicates it is challenging, but not impossible to meet Caltrans desired criteria. It should also be noted the effort prior to advertisement on 4/9 by responsive bidders has come with an unusual expense during the pre-advertisement period, plus a premium for the Engineers with the desired credentials that meet Caltrans specifications. If Caltrans relaxes/changes the Cantilever Bridge Demo Engineers criteria at this time, it could put responsive Bidders who have done their due diligence to comply with Caltrans criteria at a disadvantage.

    If a more relaxed Demo Engineers criteria is going to be allowed, please respond to this question as soon as possible to help us make strategic decisions for this bid.

    See Response to BI #23.

    35.0

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  • As per Section 5-1.13 we are requesting all information available for inspection: items 1-8 as well as As-built plans.

    See links below.

      1. Final Environmental Impact Statement/California Environmental Quality Act (CEQA) Statutory Exemption and Record of Decision
      2. Order No. 01-100, NPDES General Permit No. CAG912002 from SFRWQCB
      3. Cross sections are available in electronic copy in pdf format
      4. Soil samples and rock cores

        If rock cores are available for inspection, you may view them by sending a request to Coreroom@dot.ca.gov. Request to see the samples for the SF Bay Bridge. See Section 2-1.03B Supplemental Project Information in the Special Provisions.

      5. Reference samples equal blend of Federal Standard colors No. 27925 and No. 27880

        Samples can be viewed by making an appointment with the Duty Senior (email at Duty_Senior_District04@dot.ca.gov).

        Federal Color samples are also available from on-line vendors.

      6. Reference samples of Federal Color No. 26099, "Charcoal Gray" and Federal Color No. 26440, "Light Gray",regarding polyester concrete overlay for the bike path.

        Not available with the Duty Senior.

        Federal Color samples are available from on-line vendors.

      7. SFOBB East Span, Bridge No. 33-0025 and 33-0006 As-Built Plans.

        See Bidder Inquiry No. 28 above.

      8. Temporary Bypass Structure, Bridge No. 34-0006 TEMP As-Builts: Viaduct, East Tie In, and West Tie In (Phase I and II).

        See Bidder Inquiry No. 28 above.

    36.0

    Addendum 1 & on the new bid form Item No. 1 Time-Related Overhead has an estimated quantity as 1120 & Unit Price 1120. I believe there is an error in the Unit price. Please advise

    There is an error in the Time Related Overhead on the Bid Item list in addendum No.1. The Estimated Quantity is correct and it is 1120. However, the unit Price should be blank. The unit price must be provided by the bidder.

    37.0

    We suggest deleting the requirement to have the check calculations done pre-award. There seems to be ample time to have this check calc done post award and pre-construction. If this is acceptable, the current $300K stipend is adequate.

    Independent check of the Cantilever Truss removal procedure prior to bid will be required as stated in Section 2-1.03 Submittals With Bid of the special provisions. There is no consideration to changing the stipend amount.

    38.0

    The contractor qualifications are overly restrictive and eliminate many local contractors more than capable to confidently deliver this project. Please amend the Contractor Qualifications as follows:
      Whenever the word bidder is used in the questionnaire, the response shall include the prime contractor and all proposed subcontractors involved in the demolition of the Cantilever Truss, including but not limited to joint ventures, and subsidiaries and subcontractors.

    Provide a summary of the bidders experience in sequential demolition or sequential demolition and reconstruction as required in demolition or seismic upgrades of steel bridges in a marine environment including a minimum of one project in similar scope and complexity.

      1. Include names and telephone numbers of the project owner for each project cited. Designate the name of any engineer or consulting firm that provided design or other engineering services to you connected with the work, and describe those services. List the following factors as they apply to each project:

      • In navigable waterways with ocean going traffic lanes
      • Under the jurisdiction of the United States Coast Guard, or similar units in other countries
      • Subject to tides and strong currents, high winds, and fog similar to or more extreme than those found in the project limits
      • Subject to environmental restrictions, permits and utilities
      • Immediate proximity to adjacent structures and other construction projects
      • Debris collection and containment, and handling of hazardous materials on the bridge.

    The Pre-Award Qualifications Questionnaire (PAQQ) has been revised. See Addendum #3.

    39.0

    The Engineer and check engineer qualifications are overly restrictive and eliminate many good local engineering firms who can competently provide the work required.

    We suggest the following modifications be enacted for the engineering qualifications:
      2) The Contractor's Engineer and the Checking Engineer shall each meet the following qualifications. Resumes and references shall be provided that demonstrate compliance with these requirements.

      • Shall be registered as a Civil Engineer in California.
      • Shall have at least 10 years experience as a registered Civil Engineer.
      • Shall have performed stage-by-stage erection and/or dismantling analyses for at least three completed bridge construction and/or demolition projects. Of these three projects, at least one shall have a span of at least 1000 feet, and at least one shall be a steel structure. For all three, the analysis shall have included geometry and structural performance verification at intermediate stages.
      • Shall have performed stress, strength, and load/deformation resistance evaluations of at least three bridges incorporating steel trusses, that were built prior to 1965. These evaluations shall have included determinations of allowable safe loads and/or deformations in riveted and laced steel members.
      • Shall have prepared contractors' manuals for a) erection and/or dismantling, and b) field geometry control and monitoring for at least one completed bridge project. The Contractors' Engineer and the Checking Engineer shall not be employed by the same firm.

    See Response to BI #23.

    40.0

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  • If and when Caltrans opts to modify the Contractor, Engineer, check calc Engineer as well as either delete the pre-award requirement for the check calc to be done pre-award or to increase the stipend to $500,000, we request a day for day extension of the bid due date equating to the duration of the time of issuance of the Invitation to Bid to the above described addendum.

    The bid opening will not be extended.

    See response to Bidder Inquiry No. 108.

    41.0

    Description: Sheets 95, 155  176. Sheet 95, Temporary Water Pollution Control Quantities Table, makes reference to quantities based on Stage Construction sheets 155  176. These quantities cannot be verified in the stage construction sheets as described on the table.

    For Example: Table on Contract drawing 95 shows 10,487 m2 of Temporary Hydraulic Mulch. This table uses as a reference for this quantity contract drawing 157 - 159 (SC-3, 4 &5). The referenced contract drawings do not show this material and do not provide a way of checking quantities.

    Request: Please advise how to verify quantities shown on sheet 95. If possible please provide this information similar to the erosion control quantities (sheet 101) where the table can be verified with referenced sheets (sheets 96-100).

    The Conceptual WPC drawings in contract plans are not provided because the contractor's means and methods of construction are unknown and the field condition may dictate different requirements. Caltrans has included all the required items and quantities in the contract package, but it is the responsibility of the contractor to foresee the construction methods and prepare the SWPPP per field requirements.

    The Conceptual WPCD is furnished to Caltrans Resident Engineer and the Bidders may copy Caltrans' CWPCD as a guideline for preparation of SWPPP. However, CWPCD is to be reviewed as a reference only since the actual field condition may require additional measures. It is contractor's responsibility to include the additional measures and placement of Construction BMPs based on their construction methodology, experience and stage construction plans and prepare the SWPPP.

    If contractor's BMPs follow CWPCD without considering changing the field and construction condition, they will be either inadequate or none operable in preventing water pollution.

    42.0

    Description a) Sheet 454, 459, 461, 462, 464, and 466. There are missing elevations for columns 40S, 41A, 41B, and 42S and bent columns 1, 2, and 3. We have not found an accurate way to verify these elevations.
      Question a) Please provide these information if available.

    Description b) Sheet 483, 485, and 486. There are missing top of bent column elevations for bent columns 1(A) and 3(A).
      Question b) Please provide elevations at these locations if available.

    Description c) Sheet 492, 496, 500, 501, 503, 504, and 507. There are missing top elevations of columns at bents 38, 39, 40, 41A, 41B, 42A, 42B, 43A, 43B, 44A, 44B, 45A, 45B, 46, 47, 47B, and 48A.
      Question c) Please provide elevations at these locations if available.

    Description d) Sheet 492, 504, and 506. There are missing elevations at bottom of deck and top of existing 610mm CIDH piles at abutment 47A and at bottom of deck and top of existing footing at bent 48.
      Question d) Please provide elevations at these locations.

    Missing elevations have been provided. See Addendum #3.

    43.0

    This project is more about being qualified to "disassemble or de-erect" a large steel truss bridge than being able to "demolish" a steel truss bridge. Thus, the word "demolition" should be replaced by the phrase "demolition or erection" in a few key sentences in the Pre-Award Qualifications Questionnaire and the Special Provisions. This will expand the amount of qualified bidders, more accurately define the skill sets required and better serve the public in acquiring more qualified and competitive bids.
      1. Specifically, in the PAQQ, item 1, sentence 1 should be changed to "Provide a summary of the bidders experience in "demolition or erection" of steel truss bridges in a marine environment, including..."

      2. Specifically, in the Special Provisions, page 20, 2-1.03, Item 2, 2nd paragraph, 2nd sentence should be changed to "...the engineer shall have been in responsible charge for at least three bridge "demolition or erection" projects and shall have prepared "demolition or erection" plans for at least one large, continuous steel truss bridge."

      3. Specifically, in the Special Provisions, Page 209, 10-1.58, paragraph 1, 2nd sentence should be changed to "...the engineer shall have been in responsible charge for at least three bridge "demolition or erection" projects and shall have prepared "demolition or erection" plans for at least one large, continuous steel truss bridge."

    Is it possible to make these changes?

    See Responses to BI's #23 and #38.

    44.0

    How do I get As-Builts for Bridge 33-0006 as listed in Item #7 in the Section "Information Available for Inspection?"

    33-0006 is a typo. The correct bridge number is "34-0006." This applies to Item 7 and Item 10. An addendum to correct this typo will be requested.

    45.0

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  • In accordance to Special Provisions, Addendum No.1, Section 2-1 .025, "ACCESS TO PROJECT SITE", I would like to make arrangements for a site tour.

    Site tours are scheduled for June 13, 2012 and June 15, 2012, from 10:45 am to 1 pm. See the link below for more information and to register on-line.

    46.0

    The qualifications for the Engineer to have experience with the demolition of a long span truss bridge are unnecessarily restrictive. The engineering required for erecting a long span steel truss is essentially identical to that for demolition. In fact, the erection of a long span steel box girder, plate girder, arch, suspension or cable stayed requires the same engineering know how as that for demolition. There is no benefit to CALTRANS to restricting the experience to "demolition" of "truss bridges". We suggest amending "demolition" to "demolition and/or erection of long span bridges".

    See Response to BI #23.

    47.0

    Reference contract drawing sheet 536 of 821, general demolition note 3. Please confirm that "Fallowable" is the same for all failure modes including but not limited to axial tension, axial compression, flexure and shear.

    The "Fallowable" shown is for axial tension only. For other failure modes refer to Design Specifications. An addendum will be forthcoming. See Addendum #3.

    48.0

    Reference contract drawing sheet 536 of 821, general demolition note 4. We understand that "shear connection" and "bearing connection" both refer to bearing type connections (as opposed to slip critical connections). Please confirm. We also understand that the allowable stresses under "shear connection" and "bearing connection" refer to shear through the rivet shank and bearing on the rivet shank, respectively. Please confirm.

    All riveted connections are bearing type connections.

    Allowable stresses for rivets refer to:
    • Shear through shank of the rivet.

    • Bearing on the plates or the fastener, whichever controls.

    49.0

    Reference contract drawing sheet 536 of 821, general demolition note 4. Please clarify why the allowable bearing on manganese rivets is dependent upon the composition of the connected steel plies.

    The allowable bearing on manganese rivets depends on the connected plates because bearing on the connected plates controls.

    50.0

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  • Per section 2-1.03 of the Special Provisions, both the Registered Engineer and Check Engineer have requirements which preclude many qualified Steel Truss Bridge engineers from participating in the project. Please consider changing the qualification requirement s to apply for both "Demolition or Erection" for Continuous Steel Truss Bridges.

    See response to BI #23.

    51.0

    Description: Sheets 131 (U-2) and 145 (UQ-1). On Sheet 145 (UQ-1), the Removal Quantities Chart, the quantity for Gas Pipe 50mm PE at U-2, SG 10+09 TO 11+20 indicates 84m. On Sheet 131 (U-2), removal of gas pipe goes beyond SG 11+20.

    Request: Does the quantity on the Removal Quantities Chart include the quantity of removed gas pipe beyond station 11+20? And does the quantity on the Chart include the full length from the first note to the second note "CONNECT TO Exist GAS LINE" shown on Sheet 131 (U-2). Please clarify.

    No, the 84 m removal quantity is only from SG 10+09 to 11+20. The remaining portion of this pipe is located in the underground utility Encasement, which is paid for as "remove concrete." Please see UQ-1 for reference.

    Note, on U-2, there will be no removal of the gas or water line from the end of the concrete utility encasement to the call out "CONNECT TO Exist GAS LINE," approximate station E 51+45 to E 51+65. An addendum will be requested to remove the "X" marking in this location. The utility quantities are consistent with this change, and will not need to be modified.

    52.0

    Description: Sheets 132 (U-3) and 145 (UQ-1). On Sheet 145 (UQ-1) for the Utility Quantities Chart, the quantity for Sewer Pipe 150 mm PVC (Column) at U-3 E 54+00 TO 54+25 (Row) indicates 12m of 150 mm PVC Sewer Pipe. On sheet 145 (U-3), this Sewer Pipe is called out to be 75 mm.

    Request: Please clarify which diameter of pipe is correct.

    A bid item for 75 mm PVC Sewer Pipe needs to be added to the project. An addendum will be requested to correct this issue.

    53.0

    Drawings: Sheets 70 and 71(C-32 and C-33) Construction Details, Removal Details.

    Request:
    • Are there any details for the Concrete slope paving to show the thickness of it?
    • Are there any existing details for the Retaining Walls to be removed? If so, then where?
    • Remove Concrete Ditch, Sheet C-33, points to a random area on the sheet and state Remove Concrete Drainage Ditch. Could there be more information provided to what lengths or have a line drawn in to where the Concrete Ditch is located?

    a) The slope paving concrete removal quantities are shown on sheet 218 (Q-6). Slope paving thickness can be estimated from the plans and quantities specified. Note that thickness could vary over the slope paving area.

    b) There are no as-builts for the existing retaining walls to be removed. The concrete removal quantities for the retaining walls are shown on sheet 218 (Q-6).

    c) The concrete drainage ditch to be removed can be seen on drainage plan sheet 109 (D-5). There is an outline of the concrete ditch and arrows that show the flow of the existing drainage facility. The removal quantities for the concrete drainage ditch are shown on sheet 218 (Q-6).

    54.0

    Description: Sheets 131 (U-2) and 145 (UQ-1). On Sheet 145 (UQ-1), the Removal Quantities Chart, the quantity for Water Pipe 300mm at U-2, SG 10+05 TO 11+20 indicates 77m. On Sheet 131 (U-2), removal of water pipe goes beyond SG 11+20.

    Request: Does the quantity on the Removal Quantities Chart include the quantity of removed water pipe beyond station 11+20? And does the quantity on the Chart include the full length from the first note to the second note "CONNECT TO Exist WATER LINE" shown on Sheet 131 (U-2). Please clarify.

    This is the same as the removal of the Gas line. Please see the response to Bidder Inquiry No. 51.

    55.0

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  • Description: Sheet 64 (C-26). On Geogrid Plan Location No. 2, six locations are given with offsets from the SG Line.

    Request: Location point noted as "4.365 m Lt SG 11+32.126" is in question. Comparing the graphical scale on plan sheet and to the other coordinates, it appears the offset for this point is off by approximately 6 meters. Please clarify if this is the correct offset for this location.

    Some of the dimensions were not scaled properly. Corrected call-outs are shown below. An addendum will be requested to correct this issue.

    "16.163 m Lt SG 11+28.803" should be "6.465 m Lt SG 11+28.803"
    "16.163 m Lt SG 11+29.507" should be "6.465 m Lt SG 11+29.507"
    "3.340 m Lt SG 11+30.546" should be "1.340 m Lt SG 11+30.546"
    "3.399 m Lt SG 11+50.639" should be "1.340 m Lt SG 11+50.3639"
    "11.040 m Lt SG 11+51.428" should be "4.416 m Lt SG 11+51.428"

    56.0

    Description: Sheets 66-67. On Sheet 67, Note 3, states that the Geogrid reinforcement shall have minimum of 5 m length or to back of cut, whichever is greater.

    Request:
    • On Sheet 66, all three typical sections call out a cut back of 3.66 m. Please confirm if the 3.66m or the 5m applies.

    • In areas where the cut back is greater than 5m will we need to put Geogrid all the way to the end of the cut?

    The Geogrid reinforcement should follow the dimensions per the typical sections shown on sheet 66 (C-28). The Geogrid shall extend to the length of the backcut.

    So for Typical Section 1 (on sheet C-28), the length of the backcut will be per the dimensions shown, and in conjunction with the underdrain plans (C-30). For Typical Sections 2 and 3, the Geogrid zone will have a 3.66 m width.

    An addendum will be requested to modify the Note on Sheet C-29 to strike lines 2 and 3 to clarify this issue: "Geogrid reinforcement shall have a min. 8.5 kN/m long-term design strength or min. 27 kN/m Ultimate Tensile Strength."

    57.0

    Description: Sheets 65 (C-27) to 68 (C-30). On Drawing C-30 there is a call out for the invert elevation of the Under Drains and the Finished Grade of the Backfill. At the Under Drain "e" the FG and Inv. are shown to be 29.00 and 19.133 respectively. This is some 9.867 meter (32.37 feet) in vertical height apart and only 0.6 meters (from C-27) off the projection of the Stairs to the South. A note on Drawing C-28 in the upper right corner talks about the "TEMPORARY SHORING PER CONTRACTORS MEANS AND METHODS".

    Request:
    • Does Caltrans expect the Contractors to provide as tall as 9.867 meter SHORING to install the Under Drains along the South Boundary of the Embankment Confinement System and as tall as 8.995 meter SHORING to install the Under Drains along the North Boundary of the Embankment Confinement System? These would be very tall SHORING WALLS on a Very Steep Hill Sides. It would also make the shoring extremely close to the stairs on the south.

    • Would these Shoring Costs go into the Bid Items for the Under Drains (BI 190 and BI 191) or where does it need to be priced?

    a) Shoring will need to be installed to construct the Embankment Confinement System and underdrains. Also, the shoring should be a minimum of 1.0 meters from the existing timber stair piles as per the details on sheet C-28.

    b) The shoring cost should go into the relevant bid items for the geotechnical work on the slope. These items include the underdrains and/or the embankment confinement system.

    58.0

    Description: Sheet 175 (C-21). Looking at SC Drawings SC-21 there is a call out for "See Note 2" in the Lower Stage 5 - Phase 2. There is no "Note 2" on the Page.

    Request: Please clarify the Note 2.

    The call out is in error and should read, "See Note 1" in the lower Stage 5 Phase 2. An addendum will be requested to correct this issue.

    59.0

    Regarding the Site Tour, will there be any opportunity to access the superstructure, including the top of the cantilever truss, within a lane closure ? We will provide our own safety equipment, including harnesses and lanyards.

    Tours were held 6/13/12 and 6/15/12. No other tours are planned.

    60.0

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  • Subject: Cant. Bridge  Severe Jacking Forces at Mid Span with Prescribed Demolition Sequence

    The Caltrans prescribed demolition sequence for the cantilever bridge creates a very risky operation by serving the bridge at midspan of the suspended span. The very high stresses in the midspan members will need to be reduced by jacking at the top chord panel points US0 at each corner of the suspended span. This jacking process would require jacks and temporary supports/attachments to the bridge of approximately 1300 ton working capacity at each of the four top chord joints, assuming the deck is removed. If the deck is in place, then the working capacity becomes approximately 2350 ton each. After jacking, uncertainties will still exist for the severing process due to the tolerance on calculated chord forces and unknown initial lack of fit forces. Even with jacking, these uncertainties create severe hazards during the severing of the loaded bridge members.

    Please Confirm the following:
    • Caltrans expects the engineering analysis to be performed pre-bid for this part of the prescribed demolition sequence?
    • Caltrans expects the engineering analysis and drawings for this part of the prescribed demolition sequence to be turned in with the bid?
    • Contractors need to account for this procedure in the bid.

    The specifications require analysis and evaluation of the Cantilever Truss prior to bid. The drawings to be submitted shall comply with the requirements of Section 2-1.03 "Submittals With Bid" of the special provisions. Analysis calculations are not required with the bid. Full cost of removal of the Cantilever Truss is included in contract item Bridge Removal (Portion) Location G.

    61.0

    Description: Section 10  1.58 states: "Welding to existing bridge members will not be permitted. Only high strength bolted connections to existing bridge members will be allowed."

    Numerous jacking brackets and temporary connections will be required in order to dismantle the structure. Existing gussets are filled with closely spaced rivets which frequently connect many plies of thin plate. It will be very difficult and time consuming to remove rivets and make temporary bolted connections. Welded connections would be simpler to design and install in many locations. In addition, a lot of the members are box sections that will not allow access to the bolt head or nut on the inside of the member.

    Request: We request that the specifications be revised to permit field welding to existing bridge members.

    The existing steel is not adequate for producing quality welds, therefore welding to existing bridge members will not be allowed.

    62.0

    We find the as advertised experience requirements for the Prime Contractor and all proposed sub-contractors to be appropriate. We believe that it will be unwise to change or relax the experience requirements for the Contractor or any proposed sub-contractors involved in the demolition of the Cantilever Bridge as this project requires extensive and relevant deconstruction skills and experience in order to ensure the safe dismantling of the bridge.

    Contrary to the misstatements in other Bidder Inquiries, this project is primarily a demolition/dismantling project. The proposals put forth that demolition/dismantling experience is the same as erection experience is specious at best and dangerous at worst. If Caltrans were asking for Pre-Award Qualifications on an erection project of similar size and scope would demolition contractors qualify?

    We request that the project PAQQ and Special revisions remain as written and the bid date remain September 25, 2012.

    See response to BI #23.

    63.0

    Recent Bidder Inquiries have requested changes to the demolition experience required of the primary and check engineer by both the Pre-Award Qualifications Questionnaire and the Special Provisions. We find the as advertised experience requirements for the Contractors registered engineer and the check engineer to be appropriate for this project for the following reasons:
    • We find that 10 years experience as registered Civil Engineer is appropriate for a high profile project of this size and complexity. Also, we know that other projects of similar scale and complexity have the same or more stringent requirements.
    • We find the requirement for experience in preparation of at least three demolition plans and demolition plans for at least one large, continuous steel truss bridge to also be appropriate for a project of this scale and complexity. Also, we know that other projects of similar scale and complexity have the same or more stringent requirements. Several inquiries have implied that experience with erection plans is equivalent to experience with demolition plans. Our experience indicates that this assumption is incorrect. We have learned that there are numerous considerations that are unique to dismantling operations. These considerations include technical details such as the removal of existing members under load. More importantly, practical experience gained as a registered engineer in the field can only come from participating in actual bridge dismantling operations on similar projects.
    • It seems inappropriate to change the experience requirements this late in the bidding process. The project has been advertised since early April, 2012 and, more importantly, the State made the experience requirements clear as early as October, 2011 in multiple Contractors outreach meetings. Responsible contractors and engineering firms have already assembled their teams based on the current requirements and have expended monies and resources to perform engineering analyses using qualified personnel that meet the current contract requirements. Changing those requirements eight months after the outreach meetings would create an unfair disadvantage to those who have performed their due diligence in accordance with the current PAQQ and Special Provisions.

    In conclusion, we are of the opinion that it will be unwise to change or relax the experience requirements for the Engineer on this project as the project requires extensive and relevant engineering skills and experience in order to ensure the development of a safe dismantling procedure and subsequent monitoring of the same. As such we recommend no change to the engineering experience requirements.

    See response to BI #23.

    64.0

    I am writing to ask an additional question regarding the answers to Inquiries 23 and 30 and Addendum #3.

    It still seems that many engineers could have the technical skills and experience to analyze a truss bridge and develop a dismantling program in conjunction with a qualified contractor. The revised experience requirements, while better, still unfairly exclude these experienced engineers. In fact the revised experience requirements seem to permit a minimally experienced engineer to qualify for the Bay Bridge project. I can envision a scenario where a young engineer just out of school works for a registered Civil Engineer on qualifying projects, but with limited technical responsibility, and then after five years of experience and getting his or her own registration, claims to be qualified. They would never have made the decisions that an engineer in responsible charge makes on such projects. This scenario seems potentially dangerous and risky to public safety, and the new bridge. An engineer with 30 or 40 years of structural engineering experience, much of it on bridges but not on three truss bridges like the Bay Bridge, would still not qualify, but would be obviously more experienced than the engineer with 5 years of experience after registration. The only thing that might prevent the young engineer from qualifying is that he or she cant dig up the signed drawings and calculations. But if they did have them, what would it prove, since Caltrans wont be able to necessarily determine who did what? It seems that a recognized expert on the Bay Bridge, including engineers on the Caltrans staff, dont even qualify for the project.

    The engineer and check engineer qualifications criteria for the temporary supports has been changed. See Addendum #4.

    65.0

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  • The Section 10-1.27 TEMPORARY SUPPORTS (CANTILEVER TRUSS) required engineer qualifications were not revised in Addendum #3. Please confirm if Caltrans intends to maintain the engineer requirements listed in Section 10-1.27 or revise them to match the current requirements in Section 10-1.58.

    The current Section 10-1.27 engineer requirements are listed below:
      "The Engineer shall have at least 10 years experience as a registered Civil Engineer and shall have prepared demolition plans for at least one large, continuous steel truss bridge.
    Please advise.

    The engineer and check engineer qualifications criteria for the temporary supports has been changed. See Addendum #4.

    66.0

    Addendum No. 3 changed the Subcontracting Provisions in a manner that excludes the work for Bridge Removal (Portion), Location G, from the work that can be self-performed by the Contractor and counted toward work equaling at least 30 per cent of the value of the original total bid. Will Caltrans consider changing this requirement to permit the Contractor to include Bridge Removal (Portion), Location G, in the work that can be self-performed by the Contractor and counted toward work equaling at least 30 per cent of the value of the original total bid?

    Section 5-1.025 "Subcontracting" has been changed. See Addendum #4.

    67.0

    a) When will the Bidder Inquiries be updated (current version on Caltrans website has not been updated since May 29)?  This includes the Bidder Inquiries submitted at the June 14 Pre-Bid Meeting.

      b) Where can we find the information from the June 14 Pre-Bid Meeting that Caltrans agreed to post on its website?

    Posted.

    68.0

    a) Will the Department consider waiving requirements that the Contractors Engineer for the Cantilever Truss Dismantling shall have signed and stamped approved erection plans or approved dismantling plans provided that the Contractors Engineer can demonstrate and verify the required experience to the Departments satisfaction?  

      b) Will the Department consider waiving requirements that the Contractors Engineer for the Cantilever Truss Dismantling must provide signed and stamped approved erection plans or approved dismantling plans provided that the Contractors Engineer can demonstrate to the Departments satisfaction that such plans did not require signing and stamping at the time the work was performed?    

    c) Will the Department consider waiving requirements that the Contractors Engineer for the Cantilever Truss Dismantling must provide copies of approved erection plans or approved dismantling plans upon reasonable justification to the Departments satisfaction why such plans cannot be provided?    

    a,b,c) No. Signed and stamped plans for the qualifying projects must be provided if requested by the Engineer. The plans must be signed and stamped by the engineer or if the plans are stamped by others the engineer must submit a copy of complete, signed design calculations for the qualifying projects and a copy of the approved plans stamped by others. See special provisions section 2-1,03 "Submittals With Bid".

    69.0

    Do the current specifications prevent a contractor from substituting one qualified engineer for the Cantilever Truss Dismantling with another between the pre-bid and post-award phase (with the understanding that Caltrans must approve the substitution and that the substituted engineer must demonstrate the required qualifications and experience)? If not, will Caltrans consider amending the specifications to permit this?

    The special provisions allow substitution of qualified engineers between pre-bid and post-award phases provided they meet the experience and qualifications criteria. See revisions to special provisions section 10-1.58 "Bridge Removal, Portion (Cantilever Truss)" in Addendum #4.

    70.0

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  • Would it be possible to schedule a design workshop in early July to discuss what Caltrans know about existing Cantilever Truss?

    No design workshop is planned at this time.

    71.0

    Prequalification of fabricators was very important to bidders on the SAS Project because steel fabrication was so important. In the same sense, tower requalification of the PE's who stamp the demolition procedures is very important to the success of the project and the certainty this brings to the contractor. We request Caltrans to set up a mechanism to requalify PE's by the end of June or early July.

    Potential bidders will be given a one-time opportunity to request pre-bid determination of the experience and qualifications of the engineer and check engineer the bidder proposes to use for the design of the dismantling of the Cantilever Truss. An addendum will be issued to specify the submittal date and other requirements.

    72.0

    We respectfully request for the lowering of the suspended span to be allowed as an option. Based on our analysis we believe it could potentially provide a higher level of safety in the dismantling process.

    The removal sequence has been revised to allow lowering of the suspended span as a unit. See "Removal Sequence" plan sheet in Addendum #4.

    73.0

    Do you have a database for the general contractors to look for specific industry interests?

    Lists of certified small businesses, DVBEs and DBEs can be obtained from the databases at DGS (Department of General Services) at www.dgs.ca.gov or go directly to http://www.bidsync.com/DPXBisCASB and CUCP (California Unified Certification Program) at www.dot.ca.gov/hq/bep or go directly to http://www.dot.ca.gov/ucp/GetLicenseForm.do. In addition, the Toll Bridge Small Business Program maintains a database of small business and DVBE contractors, venders and suppliers that have performed work or provided services on bay bridge construction contracts and this list can be provided upon request.

    74.0

    How do Caltrans Bridge Design Specs and AISC Manual of Steel Constructor work together if they conflict with each other?

    The Design specifications have been changed to AASHTO Manual For Bridge Evaluation. See revisions to "Index to Plans" sheet in Addendum #4.

    75.0

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  • Why does bid submittal reference different drawing from final execution submittal requirements? "Index to Plans" vs. "Demolition."

    The special provisions references have been corrected to plan sheet "Removal Sequence". See Addendum #4.

    76.0

    Would like option to lower all or portion of suspended span to barges on water.

    See response to BI #72.

    77.0

    Provide all photos & BIM Models from meeting.

    A BIM model computer file will not be made available to prospective bidders, however, all photos and displays from the bidder conference are available on baybridgeinfo.org website.

    78.0

    Will a full BIM Model computer file of the bridge be made available to the prospective bidders?

    No.

    79.0

    If I understand contaminated material requirement it is contractor's responsibility to keep all water run-off from bridge deck to be collected and not allowed to go into Bay or on Land. Is this correct? Nothing will be allowed to be dropped into Bay (water), all debris and hot burn material must be caught by debris shield?

    All construction-related debris and materials must be contained and not allowed to discharge from the site. See special provisions section 10-1.58 "Bridge Removal, Portion (Cantilever Truss)", subsection "Debris Containment System" for additional requirements for all dismantling activities.

    Storm water run-off that has been impacted by construction activities, including the dismantling of the existing structures, must be contained and/or managed in accordance with special provisions section 10-1.07 "Water Pollution Control" and permit requirements. All construction non-storm water run-off must be controlled and water from off-site sources must be either directed away from active construction or managed collectively with construction run-off. See special provisions section 10-1.08 "Construction Site Management" and permit requirements.

    80.0

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  • Will there be any construction management role on this contract? If so, will it be existing consultant or in-house?

    Caltrans is the lead construction management.

    81.0

    Please explain why this project does not have any UDBE participation goal.

    This project is non-federally funded, so only projects with federal funds have required UDBE participation goals.

    82.0

    Why does California generate DGS, CUCP, and Project Databases? Why is there no UDBE pool for this project?

    The DGS and CUCP databases contain information regarding California certified small businesses, DVBEs and DBEs (CUCP) and the information is available to anyone looking for certified businesses. Project databases, including the one on Caltrans Office Engineer website, provide information regarding upcoming state construction contracts, including plans, specifications and item quantities.

    This project is non-federally funded, so only projects with federal funs have required UDBE participation goals.

    83.0

    Are there photos available of the South South Detour construction?

    South-South Detour photos are available by submitting a written request on company letterhead and shall include the information requested (South-South Detour photos), the purpose for the information (include contract number), and contact information.

    The Contractor shall also provide photo identification and complete and sign a "Confidentiality Agreement Form." The Confidentiality Agreement form can be downloaded below -

    Contractor may email the Confidentiality Agreement form, photo id and the written request as attached pdf files to the Duty Senior at duty_senior_district04@dot.ca.gov.

    84.0

    Specification 10-1.108 - Erect State-Furnished Bikepath at Pier W2 states that the bikepath steel is stored at a facility within 25km of the Bay Bridge Toll Plaza.

    Would it be possible to get the exact location (address and owner/lessee ) of the storage facility? Is there water access sufficient for barge & floating crane access?

    The bikepath steel is stored in various locations at Pier 7 in Oakland at the construction field office. There is barge and floating crane access that must be coordinated with American Bridge Fluor at Pier 7. The contractor must establish marine access on Yerba Buena Island.

    85.0

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  • The BrIM model would be a very useful tool for the analysis of the Cantilever Truss Demo, as it would help engineers and contractors alike visualize important details of the structure and enhance our understanding of the same. Please provide the BrIM model or provide the steps necessary to obtain the BrIM model.

    The BrIM model was developed for the use of the State and is not available to the bidders.

    86.0

    We have identified considerable issues with the engineering criteria Caltrans is mandating for the demolition of the Cantilever Truss. The issues arise from using Caltrans allowable stresses, mandated wind loads, and prescribed demolition sequence. Examination of the original design calculations shows that, in general, the bridge members were sized to just meet the allowable design stresses used at that time. The current allowable design stress (Caltrans 2004 Specifications) greatly reduces member capacities. In particular, the allowable stresses in steel compression members have been reduced by approximately 30% while erection wind has been increased from 22 psf (15 psf on 1.5 times projected area) to 58 psf (1.86 KN/m2 on windward projected area plus 0.93 KN/m2 on the leeward projected area). The current engineering criteria create an overstressed condition for bridge members in their current condition before any demolition operations commence. For example, the tower legs above deck level for pier E2 are overstressed under the dead load plus wind combination. In addition, using current engineering criteria and following the demolition sequence defined on sheet 2 of 87 (Revised to Addendum 3) leads to widespread cases of overstress in truss top chords, truss bottom chords and top lateral bracing and strut members. This situation creates a very large and complicated retrofit project for a demolition job. The effort and engineering expense required to resolve these issues is a monumental task and would become cost prohibitive pre-bid with only a $300K stipend. Given the apparent impact of the present project criteria, we request consideration of the following:
      1) Allow the use of AISC 1989 Allowable Stresses for steel members in compression instead of Caltrans 2004 Specification. This would reduce the number of overstressed members but not eliminate the need to retrofit members entirely.
      2) Allow for lowering of the suspended span. This would reduce the number of overstressed members but not eliminate the need to retrofit members entirely.
      3) Allow the wind criteria for demolition to be reviewed to incorporate statistical effects of the short time duration of the wind critical stages.

    Please confirm that pending any revisions to the existing criteria, Caltrans will require the Contractor to fully reinforce any member or connection which show any overstress at any stage of the demolition process (using Caltrans 2004 Specification).

    Finally, we respectfully request a prompt response to these comments. These issues are virtually blocking us from moving forward with our engineering efforts and estimate. In addition, the response to these questions could have implications to the pursuit of this project.

    1) The design specifications have been changed to AASHTO "The Manual for Bridge Evaluation" and the revised General Demolition Notes. See revised "Index to Plans" plan sheet in Addendum #4.

    2) The removal sequence has been revised to allow lowering of the suspended span. See revised "Removal Sequence" plan sheet in Addendum #4.

    3) The wind loading shown on the plans must be used for design of the dismantling of the Cantilever Truss. Depending on the Contractor's means and methods and the removal sequence used, strengthening of existing truss members and/or connections may be required.

    87.0

    Reference Special Provision Section 10-1.58 Bridge Removal, Portion (Cantilever Truss). Items 9, 10 and 11 listed under the minimum inclusions for the bridge removal plan are outside the normal scope of work for a registered Civil Engineer. These items are a requirement of the Prime Contractor elsewhere in the Special Provisions, specifically Sec.5-1.35 Project Safety, 10-1.02 Health & Safety Plan, 10-1.08 Construction Site Management, 10-1.42 Maintaining Traffic, 10-1.53 Existing Highway Facilities, in addition to the Standard Specifications Sec.7-1.06 Safety & Health Provisions, 7-1.12 Indemnification, 7-1.16 Contractor's Responsibilities, and 7-1.13 Disposal of Material Outside the Highway Right of Way. We request that Items 9 through 11 be removed from the portion of the bridge removal plan to be stamped by a registered Civil Engineer.

    Alternatively, please strike items 10 and 11 and revise item 9 to, "Measures to assure that the stability of the remaining structure will be maintained."

    Special Provision Section 10-1.58 Bridge Removal, Portion (Cantilever Truss) has been revised. See Addendum #5.

    88.0

    Reference contract drawing sheet 536, General Demolition Note 1. We have two concerns about this note. First, the Caltrans BDS imposes conservative inventory allowable stresses for frequent loads. The industry standard for bridge dismantling projects is to use higher operating allowable stresses for infrequent loads (i.e. permit loads). Following the Caltrans BDS results in, among other things, very low limits for the size of equipment allowed on the bridge deck. Second, the 1989 AISC manual is rather dated and a more contemporary ASD manual is available.

    We propose replacing General Demolition Note 1 with the following: "AASHTO Manual for Condition Evaluation of Bridges, Second Edition (1994 with interim revisions). AISC Manual of Steel Construction, 13th Edition (2005). The analysis and demolition sequence of the existing Cantilever Truss and all attachments and modifications shall be based on Allowable Stress Design (ASD) only."

    The design specifications have been changed to AASHTO "The Manual for Bridge Evaluation" and the revised General Demolition Notes. See revised "Index to Plans" plan sheet in Addendum #4.

    89.0

    Reference Special Provision 5-1.13 Supplemental Project Information, subsection Information Available for Inspection, item no. 8. This item includes design drawings for the viaduct temporary support pile foundations. The drawings titled Viaduct Truss Span 48 [and 49, 50 and 51] Falsework Tower Design Plan show temporary support piles and their 'minimum bearing capacity'. Please provide pile driving logs, pile testing data and any other available pile installation information so we may better calculate the capacity of these piles.

    Reference Special Provision 5-1.13 Supplemental Project Information, subsection Information Available for Inspection, item no. 8. This item includes design drawings for the viaduct temporary support pile foundations. The drawing titled 'Viaduct Truss Span 48 Falsework Tower Design Plan' sheet 2 of 23 shows HP14x117 piles 'to be installed' and HP14x73 piles 'existing'. Please provide the capacity of the 'existing' HP14x73 piles.

    See attached for Pile Driving Records. Additional information is not available.

    www.dot.ca.gov/dist4/construction/contracts/04-0120T4/PileDrivingRecord.pdf

    90.0

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  • Per addendum 4 some of the bid items needed to be replaced in the bid book. The numbers you assigned to replace the pages do not correspond with the pages in the bid book. Page 4 should be page 6, pages 12, 13, 14 should be 10, 11, 12, page 16 & 17 should be 14, 15 & pages 20 & 20A should be 18 & 18A.

    The Addendum #4 Bid Book page numbers were labelled incorrectly. The correct page numbers are listed below.
    Add. No. 4 Page # Correct Page #
    Page 4 Page 6
    Page 12 Page 10
    Page 13 Page 11
    Page 14 Page 12
    Page 16 Page 14
    Page 17 Page 15
    Page 20 Page 18
    Page 20A Page 18A

    Please see the revised sheets with correct page numbers in Addendum #5.

    91.0

    In Addendum #4 Section 2-1.035 PRE-BID ENGINEER QUALIFICATION EVALUATION was added and states the follow:

    "The resume for an engineer shall not exceed 8 pages. The Department will not accept the resumes for more than 3 engineers and 3 check engineers from each bidder for the pre-bid determination"

    Can the engineering qualification be satisfied from a combination of three separate engineers from the same firm?

    No. Each engineer must meet the qualifications criteria as specified in section 2-1.03 "submittals With Bid" of the special provisions.

    92.0

    In the Bid Inquiry #77 response it was stated that the photos and displays would be provided on the baybridgeinfo.org website. Brian's portion of the presentation is not included in the provided presentation PDF. Please provide these missing presentation slides.

    The presentation is available at http://baybridgeinfo.org/smallbusiness. See link below.

    http://baybridgeinfo.org/smallbusiness?quicktabs_1=2#quicktabs-1

    93.0

    In Contract 04-0120T4 Addendum #4 added Sheet 536A and revised Alternate A Cantilever Truss Removal Sequence. Please confirm if Alternate A  Step 1 reference to Pier E9 is incorrect. Should the Alternate A  Step 1 read:
      "If necessary, strengthen the existing connection of the superstructure to Pier E4 to transfer the additional longitudinal loads from the cantilever truss."

    Plan sheet 536A Alternative A- Step 1 reference to E9 is correct. Depending on the Contractor's means and methods used, the existing connection at Pier E9 may need to be strengthened to transfer the longitudinal loads from the cantilever truss. This was discussed along with a slide presentation at the mandatory bidder's conference on June 14, 2012. Refer to internet site: http://baybridgeinfo.org/smallbusiness. Then click the "Outreach" tab and see the links under the heading "Bidder's Conference for Yerba Buena Island Transition Structure, Contract 2".

    94.0

    We applaud the decision to prequalify engineers. Caltrans will notify us of our submitted engineering qualifications by Friday, August 6, 2012 by letter.

    The challenge this causes is the then-qualified engineers will need 8 weeks to complete the 3-D structural computer analysis and evaluation. As such, we request a day for day extension of the bid date to a date no earlier than November 20, 2012.

    Pre-bid qualification review for Contractor's engineers was provided per bidders' request to eliminate uncertainty as to the engineer's qualifications. It is up to the bidder to manage the pre-bid engineering effort to meet the specifications requirements for the bid submittal.  Bid opening will not be extended.

    See response to Bidder Inquiry No. 108 regarding bid opening date.

    95.0

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  • Please confirm the only documents to be submitted with the bid per Section 2-1.03 Submittals With Bid are the following:
    • Drawings illustrating the Cantilever Truss Removal Sequence.
    • Drawings illustrating temp supports between Pier E1 and E2 and between Pier E3 and E4.
    • Drawings illustrating a longitudinal connection to adjacent Pier E4 superstructure.
    • Drawings illustrating structural load paths at each stage of removal.
    • Engineer & Check Engineer submittal compliance certification.
    • Engineer & Check Engineer Supplemental Project Information review certification.
    Please confirm no calculations, computer model input/output reports, or other design analysis reports will be required to be submitted with the bid. Please confirm if the load paths illustrated in the drawings shall include load magnitudes.

    In addition, please clarify Section 2-1.03 Submittals With Bid reference to "each stage." Will a "stage" be defined per the sequences provided in Contract Plan Sheet 536A of 821 - Existing Cantilever Truss Demolition: Removal Sequence? Or will a "stage" be defined when every time the cantilever truss structure is modified during removal operations?

    In addition to the items listed, the submittal drawings shall be signed and stamped by the design and check engineers.
    No calculations or other analysis reports are required with the bid.
    Load magnitudes are not required on the load path drawings.
    Stages of removal are determined by the Contractor based on the Contractor's means and methods and the selected removal strategy.

    96.0

    Reference contract drawing sheet 536, note 11, footnote "L". Construction live load already includes both heavy equipment (i.e. cranes and excavators) and an allowance for miscellaneous items (i.e. pickup trucks, generators, etc.). As such, we find the additional 20 psf load to be unnecessary.

    For bridge removal, we recommend following the same criteria that is already in Special Provision 10-1.27 Temporary Supports (Cantilever Truss): "The construction equipment shall be the actual weight of the construction equipment but in no case shall be less than 960 N/m2 of deck surface area of the frame involved."

    Plan sheet 536, note 11, footnote "L" has been revised. See Addendum #5.

    97.0

    Reference contract drawing sheet 536 note 9. The stated 30 and 50% impact factors are not in accordance with standard industry practice for engineered bridge dismantling. In standard practice, there are a variety of impact factors that are selected by the contractors engineer.

    We request that note 9 be revised to permit the impact factors to be selected by the contractors engineer following standard industry practice.

    Alternatively, we recommend minimum impact factors of 0% for pickup trucks and miscellaneous equipment, 10% for loaders and excavators without hydraulic hammers and 30% for excavators with hydraulic hammers.

    Further, we assume that the 100% crane impact factor is for marine cranes. We recommend using a 30% impact factor for loads suspended from cranes on the bridge deck.

    Plan sheet 536, note 9 has been revised. See Addendum #5.

    98.0

    Reference contract drawing sheet 536A Alternate A steps 3, 7 and 9. We request that upper deck stringer and floorbeam removal be permitted in step 3 except at locations where the contractors engineer determines that the floorbeams and stringers need to remain as truss bracing.

    Alternatively, we request that upper deck stinger and floorbeam removal in the leading three panels be permitted in steps 7 and 9.

    Reference sheet 536A Alternate B steps 2 and 7. We have the same questions as stated above for these steps.

    The upper deck floorbeams provide lateral bracing to the truss members. Stability of the partially dismantled structure must be maintained throughout the demolition process in accordance with Note 7 on plan sheet 536. During Steps 7 and 9 of Alternative A and Step 7 of Alternative B on plan sheet 536A, removal of the upper deck stringers and floorbeams in the two adjacent panels in addition to the end panel being removed will be allowed provided the stability of the truss members is verified and checked by the contractor's engineers.

    99.0

    There is currently the Construction bid out for 04-0120T4 Construct Bridge, Roadways, Elec, Buildings & remove Bridges. I was told it would be up to the Resident Engineer if the Q/A testing and inspection would be totlally handled internally or a consultant like our firm could assist and if an RFP would be released.

    Can you tell me if there will be special inspection services (Q/A materials testing)required from outside consultants to assist the Resident Engineer on this project? We are a certified DBE and have a Caltrans certified Lab in Oakland.

    It is not anticipated that additional services will be needed for this contract.

    100.0

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  • Can you please provide the CAD (Microstation) files for the following two drawings:

    Sheet 537 of 821 "Existing Cantilever Truss Demolition", "Demolition Limits Plan" Sheet 538 of 821 "Existing Cantilever Truss Demolition", "Truss Member Materials"

    CAD files for the referenced drawings are not available to the bidders.

    101.0

    Reference Section 2-1.03, "Submittals with Bid" of the Special Provisions. The second sentence of the first paragraph was revised in Addendum No. 4 to read, The analysis shall include 3-D erection analysis to determine locked-in forces in truss members and 3-D dismantling analysis."

    Reference Section 10-1.58," Bridge Removal, Portion (Cantilver Truss) of the Special Provisions. The fourteenth paragraph, item 1 was revised as follows: "1. Complete 3-D structural analysis and evaluation of the Cantilever Truss for the planned removal procedure. The analysis shall include 3-D erection analysis to determine locked-in forces in truss members and 3-D dismantling analysis."

    Our analysis in the pre bid phase does account for the original construction sequence and subsequent retrofits. Our analysis in the pre bid phase does account for locked in forces and displacements due to jacking, temporary members, prestressed members and temporary supports during bridge dismantling. We assume this analysis to be adequate for the evaluation intended and in compliance with the above referenced specification Section 2-1.03 "Submittals With Bid."

    However, if it is the Departments intent to require a member by member phased erection analysis using geometrically nonlinear software with the bid submittal, we request either:

      1) a minimum one month extension to the current bid date and a $100,000 increase in the stipend. Our current analysis prepared during the prior 9 months has been done in accordance with both the pre-bid outreach from Caltrans and the bid documents. Changing the analytical methods at this late date will require a substantial effort and expense.

    Or:
      2) Deletion of the Addendum No. 4 revision to Section 2-1.03 Submittals With Bid language requiring "3-D erection analysis to determine locked-in forces in truss members".

    The analysis is still required to be performed in the Section 10-1.58 in preparation of the Bridge Removal Plan. We assume that it is not the Departments intent to require this type of analysis in the pre bid phase as long as the original erection sequence and proposed dismantling sequence are still accounted for by other analytical methods. Please confirm.

    It is not the Department's intent to require a member by member phased erection analysis using geometrically nonlinear software with the bid submittal. However, locked-in forces in members must be considered in the dismantling procedures. Members under stress shall be unloaded to a level that will not result in sudden redistribution of member forces or excessive displacement. See note 8 on Index to Plans sheet.

    102.0

    Reference contract drawing sheet 536A, Alternate A, step 8 and Alternate B, step 6 which contain the phrase, "Jack vertically if necessary to ensure no compression occurs in tension members &". We understand tension members to refer only to eyebars. Please confirm. Further, we assume that it is acceptable for eyebars to go slack as long as they are not relied upon to transfer compression forces.

    The bidders understanding is correct in that eyebars cannot be relied on to transfer compression forces; however, as stated in the referenced removal sequence notes, the anchor arms truss members are susceptible to stress reversals and there are tension members other than eyebars that may develop compression. Adequate compressive strength must be verified in such members as required by note 7 on plan sheet 536.

    103.0

    Question retracted.

    Question retracted.

    104.0

    Special Provisions 10-1.06 states : "This work includes providing a minimum of two full-time Contractor supplied biologists to monitor construction and other activities to protect regulated species that may be harmed during construction activities."

    Could you please clarify the following:

    • Is this requirement necessary for the Cantilever Bridge Demolition work only, or is it applicable to all construction activities?
    • If the requirement is applicable to all construction activities, is it Caltrans intent for the Contractor to employ 2-full time biologists from the time construction activities begins to the time when all construction activities end?

    The requirement for two full-time biologists is applicable to all construction activities. The Contractor must employ 2-full time biologists from the time construction activities begin to the time when all construction activities end.

    105.0

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  • Section 5-1.17 of the special provisions (Subsequently revised by Addendum 4), provides a bird monitoring schedule with the following requirements:

    - Monitoring at least 5 days during a 7-days period between January 1st to August 31st.
    - Monitoring at least one day per week between September 1st to December 31st.

    • Is this requirement necessary for the cantilever bridge demolition only, or is it applicable for all work?
    • Is it necessary for 2-bilogists to perform this monitoring or is one biologist sufficient?
    • Can the biologists be employed only when bird monitoring is required? or is it required to employ the biologists full time regardless of monitoring requirements?

    If the answer to question 104 above is that 2-full time biologists are required for the duration of all construction activities, please disregard this question.

    a) The monitoring requirement is applicable to all work.

    b) Two full time biologists must be supplied by the Contractor and used as needed to perform the monitoring.

    106.0

    Special Provisions 10-1.31 states: "The Contractor shall provide, operate, berth and maintain, beginning with the first mobilization of marine equipment until contract completion, one crew boat for the sole use of the Engineer and the Engineer's staff in performance of their work."

    Please clarify if this requirement is applicable for the duration of all marine construction activities or if it is applicable for the duration of the entire contract, regardless of marine construction activities.

    Marine access is applicable for the duration of the entire contract regardless of marine construction activities.

    107.0

    a) Section 3-1.05. 3 (on page 13 of 220) of the Amendments to the Standard Specifications requires a CPA certification self-insured retentions over $50,000. Please confirm that this requirement excludes bidders who are already certified as a qualified self-insured for workers compensation with the State of California.

    b) Please confirm or clarify the following statements:

    • Under no circumstances the Contractor has any responsibility to maintain, repair, or replace any existing structures from contract award to the time when traffic is switched to the new bridge and work for this contract can commence.
    • The risk of loss to any structures from contract award to traffic switch is not the responsibility of the contractor.

    c) Section 7-1.06B 3 of the Standard Specifications states: "Maintain completed operations coverage with a carrier acceptable to the State through the expiration of the patent deficiency in construction statute of repose set forth in Civ Pro Code § 337.15." Please confirm the requirement for completed operations coverage is needed for a 10 year term.

    a) CPA certification is required. Being certified with the State of California as self-insured for workers compensation is independent.

    b) Confirmed.

    c) Yes. completed operations coverage is required. Duration of converge is set by Civ Code 337.15

    108.0

    Addenda 4 and 5 raised additional clarifications/ questions relating to the engineering required for the preparation and check engineer review of the demolition plan and sequencing. While many of these issues have been clarified, the result has been delays to other aspects of the estimating process, including design of the in- water temporary supports and other temporary works. In order to finalize a competitive, detailed schedule and estimate for this complicated project, and in the interest of the taxpayers and project shareholders, we are requesting a one month bid date extension to the week of October 22, 2012.

    Bid opening will be extended to October 23, 2012. Expect an addenda.   See Addendum 6.

    109.0

    Due to the complex engineering and check engineering required to comply with the bid submittals that are outside the normal pre-bid process, and in order to complete a thorough, competitive demolition plan submittal, we are requesting that the bidders compensation be increased to $500,000.

    Bidders compensation will not be increased.

    110.0

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  • Referring to plan sheet 85/821 (AREAS FOR CONTRACTOR USE), and Section 5-1.27 (AREAS FOR CONTRACTOR USE-Addendum #4), We are concerned that the current contractors on Caltrans Projects 04-0120S4 (YBI Transition Structure) and 04-0120F4 (S.A.S. Bridge), could begin work on the "Designated Portion of Work"(Section Addendum No. 1) on this project, prior to 1 January 2014, as they would have control of this area, which would give them a definite advantage, formulating their total number of working days for that "Designated Portion of Work"(the B part of the A+B,)to determine the low bidder. Please clarify.

    The Areas for Contractor's Use were modified in Addenda 1 to provide equal access for all potential bidders. All contractors will have access to the existing bridge decks as of the time the existing bridge is closed for the traffic switch to the new bridge.

    111.0

    Cross Section File "CG_CrossSection.pdf" is missing station numbers for pages 1-29. Please provide an updated file with stations for the mentioned cross section sheets.

    You can download the revised cross sections below:

    112.0

    We respectfully request a minimum postponement of 2 weeks to the current bid date. There are still unanswered bidders inquiries and many significant Addenda 4 & 5 issues that require changes to design and engineering. We would ask that you seriously consider a bid date change for this project.

    See response to Bidder Inquiry #108.

    113.0

    Plan Sheet 416 calls out for approx. 3100 KG of Bid Item 207  Miscellaneous Metal (Bridge). Our takeoff shows little to none, please verify quantity and confirm.

    There appears to be an error on plan sheet 416 quantity listing for miscellaneous metal bridge as there is no miscellaneous metal bridge quantity for this structure. Plate and anchor stud attachments to the steel soldier pile are included in the contract price paid for steel soldier pile. See special provisions section 10-1.88 Piling, subsection "Steel Soldier Piling".

    114.0

    Referring to Bid Item # 171 (ERECT STATE FURNISHED BIKEPATH):
    • Referring to page 634/821 of the plans, section Q-Q, is this the only field welding required on this structure? Are all other welds completed on this state furnished material? Please clarify.
    • Referring to page 632/821, as the dimensions of the furnished cantilevered trusses are too large for regular trucking, are they broken down for shipping? Please clarify.

    a) The only field welding necessary on the Bikepath at Pier W2 is the weld of the threaded stud to top the cantilever beam.

    b) Plan sheet 631, Section H-H, shows the location of the splices of the fabricated cantilevered truss. The truss does not break down further at any other locations.

    115.0

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  • Are alternatives allowed for the modular joint seal assembly supplied by DS Brown company?

    No. The modular joint seal assemblies to be installed at the hinges of the Eastbound On-Ramp Structure are State-Furnished and no alternatives are allowed. See special provisions section 10-1.103 Install Modular Joint Seal Assembly.

    However, alternatives are allowed for the joint seal assembly at the abutment of the Eastbound On-Ramp Structure as specified in special provisions section 10-1.102 Joint Seal Assemblies (Maximum movement Rating 100 mm).

    116.0

    The attached City & County of San Francisco Municipal Code - Chapter 36, prohibits open-flame burning and torching of lead paint surfaces (see 3601.6 & 3605.2.1). This code effectively requires the Contractor to perform lead abatement before cutting any member with a torch. Since the project is located within the boundaries of San Francisco this code would apply. Additionally, once Contractors perform lead abatement (mechanical or chemical) to comply with the San Francisco code, then the Bay Area Air Quality Management District (BAAQMD) rules and/or the National Emission Standards for Hazardous Air Pollutants (NESHAP) rules regarding lead would apply to the Contractors lead abatement work as follows:
      Mechanical removal methods:
        Because of the quantity of material that would be removed, mechanical removal methods would require monitoring under the BAAQMD Regulation 11, Rule 1  Lead. The BAAQMD Manual of Procedures, Vol. VI, Sect. 2 details the monitoring procedures, which are very detailed and indicated that monitoring would need to be accomplished by either stack-testing procedures or ground monitoring procedures at the project. (NOTE: The San Francisco code indicates that mechanical removal methods are not allowed under 3605.2 - Prohibited Practices, therefore leaving chemical removal methods as the only allowed method.)

      Chemical removal methods:
        Chemical removal methods would not trigger the requirements under BAAQMD Regulation 11, Rule 1  Lead, but would trigger requirements under the National Emission Standards for Hazardous Air Pollutants (NESHAP) Subpart HHHHHH (known as 6H) if the operation uses strippers containing Methylene Chloride (MeCl)  which is typical. Those requirements would include:
        • Implement management practices that minimize emissions of MeCl.
          • Evaluate the need for paint stripping (e.g., is it possible to re-coat without stripping?).
          • Evaluate each application to identify potential alternative stripping methods.
          • Reduce exposure of strippers to air.
          • Optimize application conditions.
          • Practice proper storage and disposal.

        • For each paint stripping operation with > 1 ton MeCl annual usage, develop and implement a written MeCl minimization plan. No implementation plan is needed if usage is < 1 ton MeCl; however, sources must still utilize work practices to minimize emissions of MeCl. Consult the MSDS sheet to identify the amount of MeCl contained in the paint stripper, but note that annual usage should not exceed 181 gallons of MeCl.

        • Maintain records of annual usage of paint strippers containing MeCl.

      As detailed above, complying with the SF code creates a chain of events where the Contractor will have to include very expensive means and methods, regulatory compliance programs and record keeping regarding the bridge demolition.

      Does CalTrans expect the Contractor to include in the bid the extensive amount of money to comply as describe above, or will CalTrans waive the requirement for Contractors to comply with the City & County of San Francisco Municipal Code - Chapter 36?

    The contractor will be required to comply with State regulations with regard to this issue. City regulations, in regard to this issue, do not apply.

    117.0

    Please confirm that some portions of the "Designated Portion of Work" are allowed to begin before January 1, 2014.

    Yes the contractor may work on some portions of the Designated Portion of Work prior to January 1, 2014. Work may be performed in accordance with Section 5-1.27 "Areas for Contractor's Use" and Section 10-1.01 "Order of Work" and Stage Construction plan sheets.

    118.0

    Sheet 176 of 821 describes Stage 6 Construction for the removal of epoxy asphalt and replacement with polyester concrete. A construction note says See structure Plans for Details. I cannot find any structure details regarding Stage 6, Phase 1, Eastbound. Am I missing something? Can you point me in the right direction?

    The note should refer to roadway plans, not structure plans, for polyester concrete work in the Eastbound direction. Please see the details pertaining to this work found on Plan Sheets X-1 (2 of 821) and L-2 (19 of 821).

    119.0

    Can you please send me the Mandatory Pre-Bid Sign-in Sheet from the mandatory pre-bid held on 6/14/12 for the above-referenced project? I cannot find it anywhere on the Caltrans website

    See link below:

    http://baybridgeinfo.org/sites/default/files/pdfs/smallbiz/attendee_list_06-25-12.pdf

    120.0

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  • Referring to General Demolition Note No. 7 on plan sheet 536, "Index to Plans", what supplemental bracing is required in the superstructure at the locations of the temporary towers?

    As stated in Note 7 on Contract Plan sheet 537, stability of the partially demolished structure must be maintained. Attention is directed to Information Handout Volume 2 which includes a detailed report, "Erection of Cantilever Span", dated February 1, 1935 beginning on page 451 of the PDF. Temporary transverse sway bracing consisting of stiff members with adequate compressive capacity was installed in the anchor arms above the temporary supports while the structure was in the partially erected state to provide a proper load path to the temporary supports for resisting lateral loads such as wind. Similar temporary bracing members may be required during dismantling of the structure. Stability of the structure throughout the demolition process and any necessary supplemental bracing must be determined and verified by the Contractor's engineer.

    121.0

    Reference is made to question #116 for the inquirys on the Bay Bridge Removal project. We do not believe that the regulations and requirements cited in the question apply to this project as this project is on State property - namely the Bay Bridge.

    Please confirm that Cal-OSHA regulation Title 8 Article 4 Section 1537, and Sections 5144, 1536 and 1531 of the general Safety orders  apply to the cutting and removal of Lead based paint for this project.

    For comments on BI #116, please see response to BI #116. With respect to worker safety please be advised that all active worker safety orders apply on this project.

    122.0

    The Embankment Confinement system shown on drawing C-28 shows a grid / lift spacing of 0.3 M min and 0.450 M max. The details on drawing C-29 indicate that the grid / lift spacing is on the order of 0.700 M. The standard units that are available are 0.700 M High (using a 0.812 M face panel). The units were designed with their own integral reinforcement at that spacing. How do you want us to proceed?

    As indicated by Note 1 on Plan Sheet C-29, the ECS units must conform to the finish grade contours shown on Plan Sheet C-27. The Department will allow the ECS units for each row to be set-back the required distance to achieve the desired slope contours. If the set-back is too large, the top panel of the ECS unit must be extended to provide the necessary connections.

    Also, as stated on Plan Sheet C-28, the minimum vertical spacing cannot exceed 0.450 meters. If the standard ECS unit height is too large to meet this requirement, then a layer of geogrid reinforcement must be added to meet the spacing requirement.

    123.0

    The current Contractors utilizing Area PR, and Area FP (Areas shown on page C-45, Addendum 1) have a significant schedule advantage and therefore a price advantage over potential bidders who are not currently working on the Bay Bridge contracts. These advantages stem from the following:
    • The ability to commence work activities in Area PR and/or Area FP earlier than January 1st, 2014, as the current contractors are in possession of these areas already (e.g. start cantilever truss falsework towers on island earlier than January 1st, 2014).
    • Inside knowledge of a traffic switch onto the new bridge earlier than Labor Day Weekend 2013, as the current contractors control this date.
    The two above situations allow current contractors working on the Bay Bridge contracts to utilize hidden activities (meaning not shown in the bid schedule for contract No. 04-0120T4) to start work earlier than January 1st, 2014 (per the contract) and gain an unfair advantage on the B portion of the bid.

    These unfair advantages could be eliminated for both situations if Caltrans asserts the following:
    • No work activities in Area PR and Area FP (excluding submittal) for contract No. 04-0120T4 will be allowed to start prior to Jan 1, 2014. If current contractors working on other Bay Bridge contracts perform any work in Area PR and/or Area FP to facilitate contract No. 04-0120T4 prior to Jan 1, 2014 then they will be found in breach of contract.
    • If traffic is switched from the existing structure is earlier than Sep 3, 2013, then no work activities (excluding submittal) for contract No. 04-0120T4 will be allowed to start prior to Sep 3, 2013. If current contractors working on other Bay Bridge contracts perform any work on the existing structure prior to Sep 3 ,2013 to facilitate contract No. 04-0120T4, they will be found in breach of contract.
    We request Caltrans to either include the above statements as part of the contract, or clarify how the current contractors working on the Bay Bridge will not be allowed to utilize these unfair advantages (either starting work on the island early or inside knowledge of an earlier traffic switch) that the contract currently does not address.

    See response to bidder inquiry #110.

    124.0

    We believe that erroneous information has been presented in question 116.

    The City of San Francisco ordinance dealing with lead paint removal from steel structures Is section 3425 of the San Francisco Building code

    Mechanical removal of lead based coatings is allowed provided the work area is either contained or HEPA filtered Vaccum power tools are used.

    Applicable section below (note area in bold):
      PROHIBITED PRACTICES means any work practice that disturbs or removes lead-based paint using any of the following methods: (1) open flame burning or torching; (2) heat guns without containment and barrier systems, or operating above 1,100 degrees Fahrenheit (593.3 degrees Celsius) or causing the charring of paint; (3) hydroblasting or high-pressure washing without containment and barrier systems; (4) dry manual sanding or scraping, or machine sanding or grinding, or abrasive blasting or sandblasting without containment and barrier systems or a HEPA vacuum local exhaust tool.

    Please see response to BI #116.

    125.0

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  • I am trying to locate information on pre-approved Caltrans materials for staining chain link fencing as required by addendum #4 in section 10-1.1386 for the project referenced above.

    What product is specified or recommended for achieving the color the specification is requesting?

    There is no pre-approved materials list for staining chain link fencing.

    Caltrans does not endorse particular manufacturers. Please reference the "Materials" section of the aforementioned specification for staining requirements.

    126.0

    Please confirm that Section 7104 of the Public Contract Code (the Act of God statute) will apply to this project and that, for damage to the existing structure caused by an Earthquake exceeding 3.5 in magnitude (and subject to the other conditions of the Code), the contractors responsibility for cost of removal / repair / replacement would be limited to 5% of the bid amount.

    The bidder's understanding is correct. See Section 7-1.165 Damage By Storm, Flood, Tsunami or Earthquake of the Standard Specifications.

    127.0

    Liquidated Damages for the Designated Portion Of Work are $30,000 per day starting on the 1st day after exceeding the number of working days bid.

    Liquidated Damages for Project Completion are $20,000 per day starting on the 1st day after exceeding 180 working days after the number of working days bid for the Designated Portion of Work.

    If there was a delay of over 180 days on the Designated Portion of Work, please clarify which of the following would apply:
    • Liquidated Damages for the Designated Portion of Work would apply at $30,000 per day.

    • Liquidated Damages for Project Completion would be apply at $20,000 per day.

    • Liquidated Damages for both the Designated Portion of Work and Project Completion would apply at $50,000 per day.

    Liquidated damages for exceeding the number of days bid for the Designated Portion of Work are $30,000/day.

    Attention is directed to Addendum #1. Liquidated Damages for project completion is changed to "$20,000 per day starting on the first day after exceeding 1120 working days." Completion of the Designated Portion of Work is no longer directly linked to completion of all work.

    If the contractor is late in completing the Designated Portion of Work liquidated damages will charged at $20,000/day until the Designated Portion of Work is completed. If the contractor is late in completing all project work liquidated damages will be charge at $20,000/day until all project work is complete. Only one liquidated damage rate will be applied at any given time.

    128.0

    Addendum 3 added Special Provisions 2-1.045 SSPC QP CERTIFICATION PRE-AWARD QUALIFICATION. This provision requires contractors to submit proof of each required SSPC QP certification with your bid. Please confirm the following:
    • The only proof of certification required with the bid is the SSPC-QP 3 Enclosed Shop Facility or AISC Sophisticated Paint Endorsement Quality Program P1-Enclosed, as referred to in Special Provisions 10-1.114 CLEAN AND PAINT STEEL SOLDIER PILING.
    • No other proof of SSPC QP certification is required with the bid.

    SSPC QP certification is required with the bid as stated in Special Provisions 2-1.045 SSPC QP CERTIFICATION PRE-AWARD QUALIFICATION. SSPC-QP3 certification is required as stated in Special Provisions section 10-1.114 CLEAN AND PAINT STEEL SOLDIER PILING and section 10-1.113 CLEAN AND PAINT MISCELLANEOUS FACILITIES. No other SSPC QP certification is required with the bid. However, in lieu of SSPC QP1 certification, the Contractor must submit written documentation showing conformance with the requirements in Section 3, "General Qualification Requirements," of SSPC QP 1 as part of the Painting Quality Work Plan (PQWP) submittal. See section 10-1.113 CLEAN AND PAINT MISCELLANEOUS FACILITIES.

    129.0

    The special provisions does not provide a limit for maximum liquidated damages that could be incurred by a contractor (cap on liquidated damages). Please clarify if it is Caltrans intent for contractors to have infinite risk on liquidated damages (i.e. no cap on liquidated damages will be contemplated). Also, please advise if there is a possibility to cap liquidated damages before this contract bids.

    There is no cap on liquidated damages for this contract. There will be no addendum addressing this item.

    130.0

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  • Inquiry 128 asked what SSPC QP certifications were to be submitted with the bid. The answer was that only QP3 and QP1 for the painting of soldier piling and misc facilities were required with the bid, that no other QP certs are required.

    This would mean then that QP2 certifications for removal of existing lead paint from the structure to be demolished is not required for any contractor removing existing lead paint from the structure.

    Section 59 Painting on page 162 of the Special Provisions for this project states, Unless otherwise specified, no painting Contractors or subcontractors will be permitted to commence work without having the following current SSPC: The Society for Protective Coatings certifications in good standing: &For removing paint from structural steel, certification in conformance with the requirements in Qualification Procedure No. 2, Standard Procedure For Evaluating Painting Contractors (Field Removal of Hazardous Coatings from Complex Structure) (SSPC-QP2).

    Please clarify whether QP2 certification is required to perform lead abatement on the existing structure for demolition activities such as flame cutting.

    SSPC- QP2 certification is not required to perform lead abatement on the existing structure for demolition activities such as flame cutting. See special provisions section 10-1.53 "Existing Highway Facilities" for all safety, containment and handling requirements when disturbing paint on the existing structure.

    131.0

    Section 10-1.27 Temporary Supports (Cantilever Truss) provides the following design criteria for Temporary Supports of the cantilever truss, which reference Manufactured Assemblies, and 51-106A(2) of the Caltrans Standard Spec.:

      TEMPORARY SUPPORT DESIGN CRITERIA The temporary supports shall conform to the requirements of "Manufactured Assemblies" specified herein and shall support the initial jacking loads, if required by the Contractor's bridge removal plan, and the minimum temporary support design loads determined by the Contractor.  The vertical design loads shall be adjusted for the weight of temporary supports and jacks, construction equipment loads and additional loads imposed by the Contractor's operations.  The construction equipment loads shall be the actual weight of the construction equipment but in no case shall be less than 960 N/m2 of deck surface area of the frame involved.  A frame is defined as the portion of the bridge between expansion joints.  The temporary supports shall be mechanically connected to their foundations.  The mechanical connections shall be designed to tolerate adjustments to the temporary support frame throughout the use of the temporary supports.  

      Manufactured Assemblies Manufactured assemblies shall conform to the provisions in Section 51-1.06A(2), "Design Stresses, Loadings, and Deflections," of the Standard Specifications and these special provisions.  

      51-1.06A(2) Design Stresses, Loadings, and Deflections

    • The maximum allowable design stresses and loadings listed in this Section 51-1.06A(2) are based on the use of undamaged, high-quality materials and such stresses and loadings shall be reduced by the Contractor if lesser quality materials are to be used.
    • The maximum allowable stresses, loadings and deflections used in the design of the falsework shall be as follows:
          Timber:
        Compression perpendicular to the grain
        3.1 MPa
        Compression parallel to the grain
        3310 ÷ (L/d)2 MPa; not to exceed 11 MPa
        Flexural stress
        12.4 MPa; not to exceed 10.3 MPa for members with a nominal depth of 205 mm or less.
        Horizontal shear
        1.0 MPa
        Axial tension
        8.3 MPa
        Deflection due to concrete loading only
        0.0042 of the span, irrespective of deflection compensated for by camber strips
        Modulus of elasticity (E)
        11 x 103 MPa
        Timber piles
        400 kN

          L = unsupported length
        d = least dimension of a square or rectangular column, or the width of a square of equivalent cross-sectional area for round columns.
       
    • Timber connections shall be designed in conformance with the procedures, stresses and loads permitted in the Falsework Manual as published by the Department of Transportation.  
        Steel:

      • For identified grades of steel, design stresses, except stresses due to flexural compression, shall not exceed those specified in the Manual of Steel Construction as published by the AISC.
      • When the grade of steel cannot be positively identified, design stresses, except stresses due to flexural compression, shall not exceed either those specified in the AISC Manual for ASTM Designation: A 36/A 36M steel or the following:
        •   Tension, axial and flexural
          152 MPa
          Compression, axial
          110 300-2.62(L/r)2 kPa; except L/r shall not exceed 120
          Shear on gross section of web of rolled shapes
          100 MPa
          Web crippling for rolled shapes
          186 MPa
      • For all grades of steel, design stresses and deflections shall not exceed the following:  
          Compression, flexural
          (83 000) / (Ld/bt) Mpa, but not to exceed 152 MPa for unidentified steel or steel conforming to the requirements in ASTM Designation: A 36/A 36M nor 0.6Fy for other identified steel. Deflection due to concrete loading only 0.0042 of the span, irrespective of deflection compensated for by camber strips  
      • In the foregoing formulas, L is the unsupported length; d is the least dimension of rectangular columns, or the width of a square of equivalent cross-sectional area for round columns, or the depth of beams; b is the width and t is the thickness of the compression flange; and r is the radius of gyration of the member. All dimensions are expressed in millimeters. Fy is the specified minimum yield stress, MPa, for the grade of steel used.
      • The modulus of elasticity (E) used for steel shall be 20.7 x 104 MPa.
        Manufactured Assemblies:
    • The maximum loadings and deflections used on jacks, brackets, columns, joists and other manufactured devices shall not exceed the manufacturer's recommendations except that the dead load deflection of the joists used at locations other than under deck slabs between girders shall not exceed 0.0042- of their spans. If requested by the Engineer, the Contractor shall furnish engineering data from the manufacturer verifying the manufacturer's recommendations or shall perform tests as necessary to demonstrate the adequacy of the devices proposed for use.
     
    Caltrans Memo to Designers 20-2, Site Seismicity for Temporary Bridges and Stage Construction, indicates falsework seismic design requirements (Below in italic) which are substantially more costly than what has been specified.  

    All partially constructed bridges and temporary bridges that carry or cross over public vehicular traffic shall meet the requirements of Caltrans Seismic Design Criteria (SDC) except the Design Spectra shall be based on 10% probability of exceedance in 10 years. All partially demolished bridges that carry or cross over public vehicular traffic shall meet the requirements of Memo to Designers 20-4 except the Design Spectra shall be based on 10% probability of exceedance in 10 years. All bridges with an expected life longer than five years shall be designed using Appendix B of Caltrans SDC to determine the Design Spectra.  

    The seismicity requirements for the stage construction of Important and Non-Standard bridges shall be determined on a project specific basis. Bridges constructed under a Declared Emergency or Directors Order (after landslides, earthquake, floods, etc.) are expected to be removed as soon as possible and do not need to conform to the provisions of this memo. Those emergency bridges that are planned to carry or cross over public vehicular traffic for longer than one year, must conform to the requirements stated above.  

    The Engineer is responsible for addressing the lateral stability of partially constructed and partially demolished bridges.  

    Please confirm that the above referenced specified requirement in 10-1.27 and section 51-1.06A (2) take precedents over the above referenced Caltrans Memo to designers for the Temporary Supports of the (Cantilever Truss), and that Memo to Designers 20-2 does not apply to the contractor designed temporary structures under this contract.

    Refer to section 10-1.27 "Temporary Supports (Cantilever Truss)" of the special provisions for the design of temporary supports. Also refer to section 10-1.58 "Bridge Removal, Portion (Cantilever Truss)" for the required horizontal load to be resisted by the temporary supports.

    132.0

    I am putting together a scope of work and cost estimate for conducting biology components of the RFP for the above referenced project. I would like to look at the Bird Management Plan for Bridge Dismantle (I looked on biomitigation.org and didnt find it), and the FEIR.

    Download the Information Handouts from the internet (link below). It's the Material Handout M21.

    www.dot.ca.gov/hq/esc/oe/project_ads_addenda/04/04-0120T4/pdf/

    133.0

    I am still hoping I can receive a copy of the FEIR from you (I only need to see the bio resource section and the Mitigation Table).

    Please see the website below for the SFOBB FEIS:

    http://www.dot.ca.gov/dist4/sfobb/sfobbfeis.htm

    134.0

    The response to inquiry # 123 references the response to inquiry #110.

    Part (b) of inquiry # 123, describes a potential unfair advantage stemming from the following: "Inside knowledge of a traffic switch onto the new bridge earlier than Labor Day Weekend 2013, as the current contractors control this date".

    This portion of the question was not answered either on inquiry # 123 or inquiry # 110.

    We respectfully request a response to part (b ) of inquiry # 123.

    Traffic switch to the new bridge is planned for Labor Day 2013. There are no plans to open the new bridge prior to this date.