CONTRACTOR'S INQUIRY RESPONSES

 

November 15, 2000

 

CONTRACT NO. 04-013054
Crockett Interchange

 

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. The mailing address is P.O. Box 23660, Oakland, CA 94623-0660. The Toll Bridge Program Duty Senior telephone number is (510) 286-5549, the email address for Contractor's inquiries is Duty_Senior_Tollbridge_District04@dot.ca.gov, and the fax number is (510) 286-4563. All inquiries must include the contract number.

 

1. Will Caltrans be conducting organized site visits for bidders interested in viewing existing conditions, and if so when ?

No; the job site is generally accessible to the public.

 

2. We are interested in obtaining a full size set of cross sections for the above mentioned project.

Copies of the cross sections are available at BPS Reprographics Services 1700 Jefferson Street, Oakland, CA 94612. The telephone number is (510) 287-5485 and the Fax number is (510) 444-1262.

*8/28/00: For those who tried to get the cross section sheets from BPS and were told they were not in, there was a mix up. BPS does have the cross section sheets. Hopefully the mix up has been resolved and no other problems will be encountered. We apologize for any inconveniences.

 

3. Will Caltrans be posting the "Site Investigation Report: Carquinez Interchange and South Approach" in PDF format on this website?

No, but the report is available for inspection at the Department of Transportation, District 4 at 111 Grand Avenue, Oakland, California 94612. Please call the Toll Bridge Program Duty Senior, e-mail duty_senior_tollbridge_district04@dot.ca.gov, telephone number (510) 286-5549 at least 24 hours in advance. Copies of the report are available at BPS Reprographics Services 1700 Jefferson Street, Oakland, CA 94612. The telephone number is (510) 287-5485 and the Fax number is (510) 444-1262.

 

4. Caltrans' advertisements for bids shows the bid due date as November 1, 2000, while the Toll Bridge home page shows it as November 13, 2000. What is the correct date ?

The Bids Open date is November 1, 2000.

 

5. Are As-Builts available on CD-ROM, similar to the format for the Bay Bridge Retrofit Project? If not, will they be made available?

The As-Builts are not available on CD-ROM, and Caltrans has no plan to make the As-Builts available on CD-ROM. The As-Builts are available for inspection at the Department of Transportation, District 4 at 111 Grand Avenue, Oakland, California 94612. Please call the Toll Bridge Program Duty Senior, e-mail duty_senior_tollbridge_district04@dot.ca.gov, telephone number (510) 286-5549 at least 24 hours in advance. Copies of the As-Builts are available at BPS Reprographics Services 1700 Jefferson Street, Oakland, CA 94612. The telephone number is (510) 287-5485 and the Fax number is (510) 444-1262.

 

6. Please refer to Sheet 283 of 1050 which indicates a test pile & 4 Anchor Piles in Bent #4. Piles in Bent #4 are 750mm CIDH. The only details shown for Test Load Piles are 762mm CISS Piles. Please advise whether these are to be CISS Piles. If so, it would increase those quantities shown on the Engineers Estimate.

Pile load testing is required for Bent 4 of the Viaduct. Details for the CIDH piles for Bent 4 are shown on sheet 405 of 1050 "Load Test Piles Details No.3."

 

7. Sheet 402 of 1050 shows the length of the rebar cage at 12 meters for the 762 CISS pile, with the limit of clean out & concrete fill 300 mm below this. Using the dimensions given (12 m - 2.1 m + .125 m + .3 m) this would make clean out & concrete plug 10.325 meters. The Special Provisions indicate on page 159 that the bottom five meters of the pile shall not be cleaned out. These piles range in length from 17 m to 30 m, which would create a longer distance than 10.325 meters for clean out & concrete. As this information is in conflict, please advise which is to be used to estimate the project.

The details on Plan Sheet 402 of 1050 show the required length of the rebar cage and limits of pile cleanout. Drilling beyond the limits shown on the plans may be necessary to obtain the specified penetration. The bottom 5 meters of the pile shall not be cleaned out. This dimension is a minimum. See Special Provisions section "Open Ended Cast-In-Steel Shell Concrete Piling". Cleanout beyond the limits shown on the plans shall be backfilled with (unreinforced) concrete. See "Measurement and Payment (Piling)" of the Special Provisions.

 

8. Sheet 403 of 1050 indicates the need for an isolation case for the test pile and that the test pile & anchor piles are to be driven from OG. Is this Caltrans intention, or could the Contractor drive the test pile after the footing excavation?

The details shown on the plans require the Contractor to drive the test and anchor piles from OG in which case a casing is required. Should the Contractor elect to drive the piles after footing excavation, his proposed change must be submitted to the Engineer for approval.

 

9. Page 140 of the Special Provisions states that cross sections for Soldier Pile Walls are available in the "Informational Handout." They are not. Are they available someplace else?

The cross sections for Soldier Pile Walls are available with the cross section sheets (see response to bidder inquiry #2 for availability).

 

10. Note on "MSE Wall" Sheet 941 of 1050 states that details (dimensions) for sub excavation and class 3 replacement are on Roadway Plans. Please identify the sheet number where this information can be found. Also how is this work paid for (both Excavation & Class 3 Aggregate Base)?

Please refer to Addendum No. 2.

 

11. Can we get a copy of the "Voluntary Cleanup Agreement No. HAS 97/98 -024" or a summary & Description of the duties to be imposed on the contractor by this agreement?

The agreement is in the "MATERIALS INFORMATION HANDOUT."

 

12. Please clarify that the 3 meter radius restriction around the cable from Bent 6 to P1 as described on page 73 of the specifications will work.  The edge of deck of the steel drop in sections appear to be within that limit, and actually very close to the main cable.

It is anticipated that the edge of deck of the steel drop in section will be within the 3 meter radius limit. The bidder's attention is directed to Section 10-1.16 "Cooperation" of the Special Provisions regarding cooperation with the adjoining contractor for access to all common construction areas. The adjoining contractor is required to cooperate fully with the contractor of this contract.

 

13. Reference sheet # 911: Please confirm that the total length of soldier piles W360 x 79 is 1000m as there are two piles per position, not 500m as shown.

Please refer to Addendum No. 2.

 

14. Reference sheet # 911: Please confirm that the total length of soldier piles W360 x 101 is 3136m as there are two piles per position, not 1568m as shown.

Please refer to Addendum No. 2.

 

15. Reference sheet # 911: Please confirm that the total length of soldier piles W410 x 114 is 416m as there are two piles per position, not 208m as shown.

Please refer to Addendum No. 2.

 

16. Reference sheet # 973: Please confirm that the total length of soldier piles W460 x 101 is 1488m as there are two piles per position, not 744m as shown.

Please refer to Addendum No. 2.

 

17. Reference sheet # 973: Please confirm that the total length of soldier piles W460 x 149 is 636m as there are two piles per position, not 318m as shown. Details of the unbonded length and loadings are not in drawings, may we have details?

Please refer to Addendum No. 2.

 

18. For bid items 195 & 196 can we use Precast Trench Drain Per Standard Drawing D98C?

The Standard Precast Trench Drain per Standard Drawing D98C does not have adequate hydraulic capacity for the situation encountered on this project. Hence, no substitutions will be allowed.

 

 19. The specifications indicate that center relief drilling maybe needed to reach specified tip elevation. Is test pile data available from the current ongoing contract (04-013014) and will it be made available for the contractors bidding this contract?

The Test Pile Data is available for inspection at the Department of Transportation, District 4 at 111 Grand Avenue, Oakland, California 94612. Please call the Toll Bridge Program Duty Senior, e-mail duty_senior_tollbridge_district04@dot.ca.gov, telephone number (510) 286-5549 at least 24 hours in advance.

 

20. The specifications are unclear as how the center relief drilling and the backfilling of this drilling are to be paid. I would suggest that to avoid contractors including a contingency that Caltrans would have to pay whether the contractor preformed the work or not, that Caltrans pay for this work as extra work under section 4-1.03D Extra Work of the Standard Specifications. Please advise as to how this cost is to be paid for.

Center relief drilling to obtain the specified penetration and bearing value is included in the unit price paid for drive pile as provided for in Section 49-6.02 "Payment" of the Standard Specifications.

*10/24/00: In regard to payment for concrete filling of the area excavated by center relief drilling, please refer to Addendum No. 2.

 

21. The Cross Sections that were reproduced and sent do not include an index. Is there an index available?

An index for the cross-section sheets is not available.

 

22. Retaining Wall R-1 cross sections do not appear in the provided cross sections. Are there any cross sections available? Is retaining wall R-1 referenced from "M" or "G" line?

Please refer to Addendum No. 2.

 

23. It appears that cross sections for "G" line between station 20+80 through 22+24 are not included in the furnished cross sections. Will these be available?

Please refer to Addendum No. 2.

 

24. It appears that cross sections for "M" line between station 19+40 through 20+70 are not included in the furnished cross sections. Will these be available?

Please refer to Addendum No. 2.

 

25. The roadway cross-sections for G-Line 22+24 to 23+10 depict an embankment with no retaining structures. This conflicts with contour grading plan sheet G-3, along with Retaining Wall #2 plan sheets 941 through 960. Are the cross-sections incorrect? And if so, are the engineer’s embankment quantities for this area also incorrect?

Please refer to Addendum No. 2.

 

26. The Contract plans do not show the existing pavement section in the 3.6M wide median from "D3" 35+40 to 37+00. Is this information available?

Please refer to Addendum No. 2.

 

27. Along the west bound right-hand shoulder from "D3" 47+00 to 42+16, the total width of existing PCC pavement with AC overlay is not defined in the plans. Does this section extend all the way to the outside edge of the shoulder, or does the shoulder consist of a different pavement section?

Please refer to Addendum No. 2.

 

28. Please furnish the As-Built Bridge Drawings for Bridge No. 23-0015 ("B" Line), Bridge No. 23-0015 ("J" Line), and Bridge No. 23-0015 ("S" Line). The Drawings available through BPS (which we ordered at a substantial cost) contained only a sheet or so out of + 1000 sheets that are applicable.

Additional As-Builts (As-Built set #2) are available at BPS Reprographics Services 1700 Jefferson Street, Oakland, CA 94612. The telephone number is (510) 287-5485 and the Fax number is (510) 444-1262. As-built Set #2 contains the following as-builts:

As-built Set #1 contains the following as-builts:

 

29. Please Clarify the panel shape required to achieve the architectural finish shown on sheet 959 of the contract plans. Can we use our pre-approved cruciform panel shape? If a rectangular panel shape is required, can we use our 5x10 panel or our 4x12 panel?

Bid it according to the details shown on the plans.

 

30. Bid Item # 23 Portable Changeable Message Signs has a quantity of 30 Each. The Project Specifications (10-1.29) states that these signs will be placed "at the locations shown on the plans or wherever designated by the Engineer." There are no locations shown on the plans & 30 Each sounds excessive. Would you please detail the locations of these signs and confirm that you want 30 Each.

Please refer to Addendum No. 2.

 

31. We have been unable to confirm the roadway excavation & embankment quantities shown on the plan sheets 207/1050 for lines R1 (10+00 - 11+92) & R2 (10+00 - 10+99). The layout drawings, the grading drawings & the wall drawings all agree as to the final grades. The cross sections provided to us for this area (M line) DO NOT match the above referenced drawings and in fact DO NOT even show retaining walls R1 & R2. The drawings for retaining wall #1 indicate that the face of the wall will be excavated below final grade but does not show how far out this excavation goes. Also in those areas in which wall R1 & R2 overlap, how does this affect the quantity of MSE wall excavation?

Please refer to Addendum No. 2.

 

32. We have been unable to locate where the goegrid (Bid Item # 85) is to be placed, the specifications state these locations will be shown on the plans. Please tell us what plan sheets this work is shown on.

Geogrid (Bid Item #85) is to be placed on WB I-80 between stations D3 39+72.354 and D3 47+00.000, as shown on sheets X-5, X-6, and Q-1.

 

33. On Sheet 339/1050 "Steel girder details" show 22mm stud connectors, sheet 347 shows 25mm stud connectors for the same location. Which is the correct detail?

Please refer to Addendum No. 2.

 

34. Please provide a specification on the scaffolding rail (sheet 345/1050).

The scaffolding rail is structural steel and included in Section 10-1.74 "Steel Structures" of the Special Provisions.

 

35. Special Provisions page 223 states that "isolation casings shall consist of galvanized, corrugated structural steel plate with…neoprene strip as shown on the plans." The column isolation casing detail sheet 652/1050 does not show any neoprene strip. Where is the neoprene strip located?

Please refer to Addendum No. 2.

 

36. Will material generated from asphalt planing operations be allowed for re-use on site as structural backfill, sub-base, etc., if gradation requirements are met?

If the material generated from the asphalt planing is used as Soldier Pile Wall Backfill, it should meet all the requirements described in Section 10-1.38 "Earthwork" of the Special Provision. The contractor can use planed asphalt as Aggregate Subbase as long as it meets the requirement of the Standard Specifications and the Special Provisions.

 

37. Will broken concrete from concrete removal operations be allowed in embankments as defined in the Standard Specifications Section 15?

If the material generated from concrete removal operations is used in embankments, it should meet all the requirements described in Sections 15 and 19 of the Standard Specifications and the Special Provisions.

 

38. Page 106 of the Special Provisions addresses the installation of Pacific Bell's Fiber Optic Cable consisting of 180 days on "27 Bridge." Where is the "27 Bridge" in relation to the Bridges in this contract?

Please refer to Addendum No. 2.

 

39. Drawing D-37A from Addendum #1 refers to drawing D-47 for information about the added horizontal drains. This drawing was not included with the addendum. Will drawing D-47 be issued?

Please refer to Addendum No. 2.

 

40. Drawing D-37A from Addendum #1 includes details for over-excavation along the G-Line from R1 10+24 to 11+60, and from R2 10+00 to 10+99. Is the excavation and backfill to be paid under Bid Item 68, Roadway Excavation? If so, does the Engineer's estimate reflect this?

Please refer to Addendum No. 2.

 

41. Drawing D-37A from Addendum #1 shows a cross section at station G 21+37 that consists of a layer of structure backfill material across the width of the excavation. Is there more information available to define the limits and thickness of this layer?

Please refer to Addendum No. 2.

 

42. The Engineer's Estimate for Roadway Excavation (Type A) includes quantities of Type A excavation at all of the bridge footings designated as containing hazardous material. The structure plans currently define limits for Type H and DH excavation at these footings, but not Type A. Is there any information that defines the limits of Type A Roadway Excavation at the bridge footings?

Please refer to Addendum No. 2.

 

43. Drawing 27-A from Addendum #1 added a detail for a blanket of permeable material with a 300mm perforated pipe. What Bid Item is this to be paid under.

Please refer to Addendum No. 2.

 

44. On Contract Plan Sheet 273/1050, it appears that the quantities shown for JOINT SEAL ASSEMBLY (MR100mm) AND JOINT SEAL ASSEMBLY (MR 101 160 MM) are reversed. MR(100 MM) SHOULD READ 8 M AND MR(101 MM-160 MM) SHOULD READ 20 M. This will also affect the bid quantities given for these two items in the proposal book.

Please refer to Addendum No. 2.

 

45. We can find no mention of the "Buy American" provision in any of the special provisions, specifications, or in the recently issued addendum #1.  Can you please clarify this.

The "Buy American" provision is not part of the Special Provisions.

 

46. Addendum #1 Plan Sheet 113 A shows 3 small sketches of the proposed typical sections of grading in the area of the R-1 & R-2 Retaining Wall. Not provided on this drawing are the limits of what is MSE Wall Excavation & Backfill. Also not shown is the Roadway Excavation & Embankment limits. The typical section for R-1 10+24 to 11+60 shows structural backfill for invert fill. Is this correct? How is the permeable material shown from R-2 10+00 to 10+99 paid for?

Please refer to Addendum No. 2.

 

47. Items 223 and 224 (Bridge Railing and Pedestrian Railing) in the Special Provisions refers to Section 83 of the Standard Specifications. I noticed that the last time these items came up for bid, Caltrans wanted them powder coated. Referring to Section 83 suggests galvanized finish. Which should it be?

Bid on items 223 and 224 (Bridge Railing and Pedestrian Railing) as specified in the Special Provisions.

 

48. Utility drawings U8-U11contain references to notes 1 through 10. Where can these notes be found?

Please refer to Addendum No. 2.

 

49. Plan sheet 136 address the relocation of the Public Information Trailer. Under which bid item will this work be paid for , and where do you want the trailer?

Please refer to Addendum No. 2.

 

50. Page 106 of the special provisions (second paragraph) addresses the installation of utilities by Pacific Bell, EBMUD, and PG&E during this contract. The third paragraph refers to the work as relocations and removals. Are the "Time Allowances" for utility relocations, removals, or installations of new facilities? Do any of these facilities interfere with the removal or construction of the bridges? Please provide more information to the scope of this work so that their schedule implications can be properly addressed.

Please refer to Addendum No. 2.

 

51. The engineer's quantities include roadway excavation along the "PM" Line for Section 4+20 to 5+40. The limits of the excavation are not shown in the layout plans. Are the cross sections for this excavation available?

Please refer to Addendum No. 2.

 

52. Please refer to Sheets 618 and 623 of 1050 which shows the location of the new Bent no. 2 footing (layout and elevation).  Now refer to sheets 1043 and 1047 of 1050 which shows the removal limits of existing "S" line Bent no. 3.  The limit of bridge removal is to the top of the existing footing.  The new Bent no. 2 is partially within the same footprint of the old bent.  How much of old bent 3 footing is to be removed and piling, if any, and is this removal to be added to the appropriate bridge removal item.  Please clarify "limits of bridge removal."

Please refer to Addendum No. 2.

 

53. Section 10-1.03 States that a Conceptual Storm Water Pollution Plan is available for viewing; is this also available to Purchase? If so, where and how much?

Copies of the "Conceptual Storm Water Pollution Prevention Plan," dated August 2000 are available at BPS Reprographics Services 1700 Jefferson Street, Oakland, CA 94612. The telephone number is (510) 287-5485 and the Fax number is (510) 444-1262. Ask for document by name and date (not by job number).

 

54. Please clarify with respect to the ref. project, bid item 83/197020 Earth Retaining Structure. It appears to me from the plans that all of the walls have either a fractured fine, regular precast panel, or sculptured shotcrete finish. However, the specifications [page 143] allow the Hilfiker Welded Wire Wall as an alternative. Our WWW is just THAT....a Welded Wire wall.....wire faced. Please confirm for me that will indeed be an acceptable alternate to the concrete shown, as contractors have asked me to quote that system.

Wire facing is not an acceptable alternative to the fractured rib texture shown on the plans. Fractured rib texture shall be provided as shown on the plans.

 

55. It has been requested that cross sections be made available for retaining wall No. 1. The response has been that the cross sections are available through BPS. The cross sections from BPS do not include information for R-1 wall. Addendum No. 1 issued on September 22, 2000 states that ì cross sections of the site in the vicinity of the soldier pile walls are available for inspection at the Dept. of Transportation, 111 Grand Avenue, Oakland, Ca. It is requested that these cross sections be made available at BPS for reproduction along with the other cross sections.

Please refer to Addendum No. 2.

 

56. The electrical plans drawing E9 for location 1 show a radio used to connect the MVDS to the traffic management center, however this radio is not specified in any detail that we can find in the special provisions.  Will an AirLink Raven CDPD radio modem be satisfactory?

No, an Airling Raven CDPD radio modem shall be not be used. Currently only Metricom radio modem is specified and its manufactures specifications are available upon request.

 

57. The electrical plans drawing E14 shows a 334 cabinet to which two MVDS units are connected, and there is a note calling out the requirement for a cluster controller.  The cluster controller is not specified in the special provisions.  With the AirLink Raven CDPD radio modem, and the software available to Caltrans from AirLink through a separate contract, the need for and function performed by the cluster controller can be done by the AirLink Raven CDPD modem and the AirLink software.  The only item we would need to furnish would be a cable configured to allow both MVDS units to connect to the same modem.  Additionally, the contractor would need to wire the poll control contact from MVDS pins d and e (wires 17 and 18 on page 265 of the special provisions) in series with the RS232 TX signal output from MVDS pin V (wire 23 on page 265 of the special provisions).  Would this cable solution be satisfactory to Caltrans since it eliminates the need for the cluster controller?

No, Airling Raven CDPD modem and Airling software will not be used. Please provide the cluster controller as recommended by the MVDS manufacturer.

 

58. The special provisions page 264 require the contractor supply a 12VDC power supply for the MVDS units.  The MVDS at location 1 can work well with this supply voltage.  However, the MVDS units at locations 2 and 3 are some distance from the power supply location.  There will be line losses in voltage attributable to cable resistance that drop the power supply voltage below the 12VDC level that is the minimum recommended power supply voltage for the MVDS.  We recommend that the power supply to the MVDS for locations 2 and 3 be the 24 VDC available from the 334 cabinet power supply.  The 24 VDC supply voltage level allows for reasonable line losses, and will ensure proper operation of the MVDS.  Since each MVDS only consumes 6 watts of power, the power supply requirements for the 3 MVDS units are will within the capability of the 334 cabinet power supply.  This approach will also result in elimination of two unneeded power supplies.  If the contractor must supply separate power supplies for each MVDS, we recommend the use of a step down transformer with a 24 VAC secondary.  The MVDS will work well with input power that is in the range from 12 to 24 volts, AC or DC.  Please let us know how we should proceed.

Each MVDS unit has a built-in voltage regulator to work within the voltage range of 12 to 24 VDC which can be adequately provided by the 24 VDC power supply from the 334 Controller Cabinet. For each of the three MVDS locations we anticipate no voltage drop problem.

 

59. Layout Drawings L-6 & L-7 show the removal of Base & Surfacing (PCCP & AC) from STA D3 42+20 to STA D3 47+00. In what Stage is this work to be performed?

The remove base and surfacing between the stations D3 42+20 to D3 47+00 shall be done during Stage 3 Phase 4.

 

60. Layout Drawings L-6 & L-7 show the removal of Base & Surfacing (PCCP & AC) from STA D3 42+20 to STA D3 47+00. What is Finished Grade & Structural Section in this area (typical sections of this area shown on sheet X-6 indicates existing surfacing remaining)?

Typical Cross Sections sheets X-5 and X-6 have call outs for remove base and surfacing with the existing structural section and a note (See Note 3 on X-1). This note says "Remove base and surfacing to be replaced by top soil." Also, since the note on X-1 says replace by top soil, the finished grade of the top soil will be the same as that of the existing pavement.

 

61. Refer to plan sheets 21 and 911 with reference to the layout of Retaining  Wall R1.  It appears on sheet 21 that the intent was to have R1 return to the end of fence line "R1".  On sheet 911 the start of the wall is sta 10+24 alongside M line.  In both cases the wall is within Wanda St limits.  It appears the contractor will have to excavate significant material in this area to install the tie back wall.  Significant temporary shoring will have to be used to support Wanda, unless it was the intent to continue the wall to the layout as shown on 21.  In any event, the layout, cross-sections, including sheet 113A details, for R1 do not fit.  No roadwork for Wanda is shown at this location.

Please refer to Addendum No. 2.

 

62. The bottom elevation shown on Sheet D-37A for the Sub Excavation Typical "R1 10+24 to R1 11+60" is in conflict with Sheet 914 (Retaining Wall #1). The bottom of Retaining Wall #1 clearly starts rising at Station R1 11+38. Please advise.

Please refer to Addendum No. 2.

 

63. What does the transition from Typical Section (R1 10+20 to R1 11+60) to East end of Sub Excavation look like & what are the pay limits for this work?

Please refer to Addendum No. 2.

 

64. What does the transition from Typical Section (R1 10+24 to R1 11+60) to Section (R2 10+00 to 10+31) look like?

Please refer to Addendum No. 2.

 

65. What does the transition from Typical Section (R2 10+00 to 10+31)) to Section (R2 10+31 to 10+99) look like?

Please refer to Addendum No. 2.

 

66. What does the transition from Typical Section (R2 10+31 to R2 10+99) to West end of Sub Excavation look like & what are the pay limits for this work?

Please refer to Addendum No. 2.

 

67. In order to build Retaining Wall #1 from Station 10+40 to 11+20 a temporary fill must be built & then moved. How is this paid for?

Removal of backfill is not required to construct the retaining wall. Bid it according to the details shown on the plans. Please refer to Plan Sheets 921, 922 and 923.

 

68. There are test piles shown for Bent #10 of East Bound off-ramp (G Line). Since this area must be sub excavated, will the these piles be installed after the sub excavation?

Bid it according to the details shown on the plans. Please refer to Plan Sheet 699 of 1050.

 

69. Will welding inspection be required for the welded head bar reinforcing (I.e. does welding quality control specification apply)?

Yes, the "Welding Quality Control" specification applies to welded headed bar reinforcement.

 

70. Fish and Game permit is for wrong contract.

Please refer to Addendum No. 2.

 

71. The final pay quantities for the soldier pile has not accounted for the double piles.

Please refer to Addendum No. 2.

 

72. What are the locations of the 30 each portable changeable message signs? Section 10-1.29 says they are paid for by force account if utilized for public awareness.

Please refer to Addendum No. 2.

 

73. Page 73 of the specifications confines the contractors operations around the south anchorage. Constraint number three restricts the contractors work to within 28M left and right of the centerline of the anchorage. This dimension conflicts with the limits of the bridge deck and does not allow room for crane access to service the bridge construction. This is clearly a conflicting specification. Please advise.

Adjustments may be made in the field as approved by the Engineer to insure reasonable access to common construction areas. The bidder's attention is directed to Section 10-1.16 "Cooperation" of the Special Provisions regarding cooperation with the adjoining contractor for access to all common construction areas. The adjoining contractor is required to cooperate fully with the contractor of this contract.

 

74. Bid Item No. 1 indicates a pay item for "temporary creek diversion system. The specials indicate the creek diversion is located on the contract drawings. Please indicate which drawing number the proposed creek diversion plan is located on.

Please refer to Addendum No. 2.

 

75. We have been told that there is a pending change for the bid date. Can you please provide us with the new bid date as soon as possible. We have people working on this project from out of town and we need to make travel & lodging accommodations for them. Short notice airline tickets are very expensive & there is a chronic shortage of hotel/motel rooms in the Bay Area.

Please refer to Addendum No. 2.

 

76. The vertical limits for Structure Excavation (DH) and Structure Excavation (H) are not shown on the plans.

Please refer to sheets 69, 70, and 71 of the plans for vertical limits for Structure Excavation (DH) and Structure Excavation (H).

 

77. We have several copies of plans and specs being used by various estimating personnel.  We received only one copy of the addenda one and two.  Can we have at least two more?

Caltrans Division of Office Engineer distributes one addenda package to each Contractor who purchased contract documents; however, we do not provide copies for each additional set of plans & specs the Contractor may have purchased. Caltrans makes available addenda to the Contractor on our website <http://www.dot.ca.gov/hq/esc/tollbridge/index.html>.

 

78. How does the contractor comply with the first paragraph of the subsection titled "Excavation Dewater" on page 82 of the Special Provisions? (i.e. relative to providing a sealed excavation at the retaining walls). Water will flow through the lagging at retaining wall number R1.

The Contractor does not need to seal lagging. Water at the bottom of the excavation needs to be controlled to facilitate construction until the underdrain is complete.

 

79. On page 73 of the Special provisions, "Order of Work," it states that bridge removal work on Bridge No. 23-0015R shall be between the hours of 7 A.M. and 6 P.M. On page 133, Item J states no removal shall be under way at bridge No. 23-15R, Span A12E, while trains are passing under the span. Please note that there is a train running every 10-15 minutes during daytime hours. Furthermore, on page 324 it states that the Railroad Line can only be closed between the hours of 11 P.M. and 6 A.M. Will Caltrans allow the contractor to perform the removal over the railroad tracks between 11 P.M. and 6 A.M.? If not, how shall the work be performed?

Please refer to Addendum #3.

 

80. On page 133 of the Special Provisions, top of the page, Item H states that at Bridge 23-0015R deck slab and barrier railing shall be removed intact to minimize concrete and reinforcing steel falling onto the protective cover or the ground below. It also states, areas where the removed concrete is allowed to fall to the ground shall be secured by fencing. Why is Caltrans trying to minimize concrete and reinforcing steel falling onto the protective cover or the ground? What are the locations that Caltrans will allow concrete to fall to the ground?

The specifications require that sections of the deck slab and barrier railing be removed intact to minimize concrete and reinforcing steel falling below. This is to minimize possible damage to the existing bridge and facilities. The protective cover is required whenever the removal work is to be performed over public traffic or railroad property as stated in the Special Provisions. Where a protective cover is not required, concrete may be allowed to fall to the ground as provided in the Special Provisions. See Section 10-1.34 Bridge Removal of the Special Provisions.

  

81. We have made arrangements with BPS to come to your office to copy the following report for the above-referenced contract: site investigation report: Carquinez interchange and south approach. BPS would like to be at your office at 1:00 p.m. today. If this is not possible, please notify them ASAP with a convenient time.

Arrangements to view or copy documents for this contract at the District 4 office must be made at least 24 hours in advance. Arrangements can be made by contacting the Toll Bridge Program Duty Senior at District 04 Office, 111 Grand Avenue, Oakland, California 94612; Fax Number (510) 286-4563; E-mail address, duty_senior_tollbridge_district04@dot.ca.gov; Telephone Number (510) 286-5549.

 

82. We have numerous copies of plans and specs being used by various estimating personnel to prepare our bid. We received only one copy of the addenda one and two. Can we have at least five more, or even better one for each of the sets that we purchased?

Please refer to response #77 above.

 

83. Can you make the addenda 2 plan sheets available on the Caltrans website similar to addenda 1?

Yes.

 

84. Are the building foundations show in the plans included in the clear & grub item?

Yes.

 

85. On page 73 of the specifications, 10-1.01, order of work, note 1 regarding "no work allowed in the area bounded by the south anchorage footing plus one meter all around and a vertical projection of 25 meters".  Is it the intention of this specification and Caltrans that this contractor's bridge falsework is to span the entire anchorage?

Yes, the specification requires that the falsework span the restricted area surrounding the anchorage.

 

86. We are requesting to see the core samples for the borings taken on this contract. Please respond to a date and location that we can see the cores.

For contractors interested in inspecting the core samples, the following date has been set:

 

When: Thursday, November 9th, at 1:00 p.m.

Where: Tri Bridge Maintenance Facility, corner of East Second Street and Industrial Way, Benicia, CA

Contact: Make reservations by e-mail at duty_senior_tollbridge_district04@dot.ca.gov, or fax (510) 286-4563.

 

Note: All participants must have a hard hat, reflective vest, safety glasses, and work shoes/boots.

 

87. Section 10-1.38 EARTHWORK calls for an Expansion Index test every vertical meter of fill. What exactly are the limits, considering you could have a sliver fill on a slope 3' wide 200' in length going up a 20' slope or a fill with a depth of 15' x 40' wide x 300' long?

The Special Provisions require that material used as fill be tested for Expansion Index. The limits of fill are determined by the details shown on the plans. Fill shall be adequately tested to demonstrate that the fill material meets the Expansion Index requirements.

 

88. Section 10-1.38 EARTHWORK calls for an Expansion Index test every vertical meter of fill. Does this apply to structural backfill materials?

Yes.

 

89. Section 10-1.01 of the Special Provisions states that access to Spans 6 and 7 are restricted to the last 180 days prior to the completion of stage 1 work. Can we have earlier access to Span 6 and up to the hinge in Span 7 as it appears to be indicated in the Stage Construction drawings?

There does not appear to be a conflict between the stage construction plans and the Order of Work specification. Bid it according to the plans and specifications.

 

90. Reference Project Plan Sheet No. 900; The quantity given for "Structural Steel (Bridge)" is 4,580 kg. We find there to be 29,980 kg. Please advise.

Please refer to addendum #4.

 

91. Refer to page 125 of the Special Provisions, "Containment System." Do you consider torch cutting smoke fumes to be an item that must be contained by the containment system?

Yes, torch cutting fumes from lead contaminated steel must be contained and sampled as described in 10-1.33, "Work Area Monitoring."

 

92. Refer to page 124 of the Special Provisions, "Work Area Monitoring (Airborne Metals Exposure)." If the containment opted for by the contractor is a tarp approximately 20'x20' that is placed under a torch cutting operation and meets the requirements of the "Containment System," what would be the location where the air samples be collected?

The air samples should be collected just outside the containment system, and at other locations as directed by the engineer, to insure safety and confirm that the containment system is working effectively.

 

93. Drawing 1006 shows new sheer studs to the stringers. Which bid item should they be allocated too.

a) The shear studs shown on Plan Sheet 1006 are included in the structural steel, bridge item.

b) The existing shear studs are on the end floor beams only, as stated on Plan Sheet 1005. The plans do not require new shear studs on the end floor beams.

 

94. We have a question regarding the pile driving specifications/drawings for the subject contract. In section 10-1.55 Piling, page 158 "Open Ended Cast-In-Steel-Shell Concrete Piling", of the Specials, it states " it is anticipated that drilling through the center of the open ended steel shells to obtain the specified penetration may be necessary". We believe at some locations this will be a must. On drawing sheet 833 of 1050 or 53 of 119 of addendum #2, horizontal welds, welds with the pipe vertical for driving, are not allowed in the top 24 meters of the pile. The spec and drawing seem to be in conflict since the pile will have to be spliced in its vertical position to allow drilling through the pile. Will pre-drilling be allowed within 5 meters of specified tip? If not and if the drawing weld restriction is not lifted how is the pile advanced through the weathered rock?

Please refer to addendum #4.

 

95. Did the specifications at the time of construction of Bridge No. 23 - 15R require the top of the top flanges of the steel girders to be painted? Specifically is there lead paint on the top of the top flanges of Bridge No. 23 - 15R?

Yes, there is red lead paint and other paint types on the existing Bridge No. 23-15R. See Section 10-1.33 "Existing Highway Facilities" of the Special Provisions for the existing paint systems on the bridge.

 

96. Are permanent deck forms allowed for the construction of the deck at Bridge No. 23 - 15R?

No.

 

97. Please clarify. Most of the joint seal assemblies on this contract with movement ratings greater than 100 mm have movement ratings shown on the contract drawings that are in an increment of 80 mm. For example, there are 240mm and 400 mm movement rating expansion joints called out. Typically, CALTRANS calls for a 75 mm maximum width for unsupported or yielding components in joint assemblies. Would it be acceptable for the expansion joints with movement ratings greater than 100 mm to be supplied based on an 80 mm maximum width instead of the 75 mm maximum width? This is an issue due to the fact that the expansion joints supplied by my company for these movement capacities are based on 80 mm maximum widths.

Bid it according to the plans and specifications.

 

98. The current A+B bidding format gives an unfair bidding advantage to the Contractor in charge of contract #04-013014. Under the current format (revised in Addendum #2), the clock for the Phase II would not begin until a minimum of 800 days from start of contract. We propose to have the Phase II clock begin after traffic is switched to the bridge.

Current Specification

Example: Contractor bids 600 working days for Phase II work. Both contracts are ready to accept traffic on day 600. The contractor has 1400 (800 + 600) working days to completely finish Phase II work.

Using the above example, the contractor in control of both projects could bid Phase II at 400 days and still actually have 600 days to complete the work. Bidding Advantage = 200 days @ $35,000/day = $7,000,000

Our Proposal

Using the same Example: Contractor bids 600 working days for Phase II work. Both contracts are ready to accept traffic on day 600. The contractor has 1200 (600 + 600) working days to completely finish Phase II work.

Caltrans concludes that there is no unfair bidding advantage. Bid it according to the plans and specifications.

 

99. We have a new request, based on addm 4, regarding the pile driving specifications / drawings for the subject contract. In the addendum the 24m no splice zone was changed to 12m, (drwg sheet 833). This helps, but one more change in the specs must be made to make the piling in rock conditions buildable. In Spec section 10-1.55 "Piling", page 158, "Open Ended Cast-In-Steel-Shell Piling", of the Specials, it states "it is anticipated that drilling through the center of the open ended steel shells to obtain the specified penetration may be necessary". We believe at the 3 rock locations, Bents 2, 3, & 4, this will be a must. The spec section goes on to restrict drilling, "Drilling to assist driving shall not extend more than 1 meter beyond the pile tip during installation." This must be changed to allow drilling more than 1 meter beyond pile tip after the pile has entered the rock. Without this change the driving in rock conditions, with splice restrictions, is virtually impossible, and the piling at the 3 locations where pile driving is in rock for more than the bottom 5 meters of the piles should be changed to CIDH piles.

Bid it according to the plans and specifications.

 

100. Please refer to sheets 401, 402, 532, 698, and 833 of 1050. There is an area at the top of the piles (either 7000 mm or 5000 mm) where the spiral cannot be spliced or anchored. With the spiral spaced at 125 mm it will be almost impossible to get the bottom footing reinforcing through. The bottom bars will have hooks as long as 600 mm. What are our options?

Bid it according to the details shown on the plans.

 

101. Regarding Caltrans answer to question # 85. To span the 164' opening at the south anchorage will require a one time use truss supported on piles at a cost of approximately $1,000,000. The contractor from Contract No. 04-013014 "Carquinez Bridge & Overhead" will have access to the South Anchorage area. Will he be allowed to cooperate with himself and enter the south anchorage area to build falsework on this contract? The advantage would be substantial.

Bid it according to the plans and specifications.

 

102. Sheet 959 of 1050 of the Contract Plan display the architectural details required for the MSE wall facia panel.  The "repeat" for the "wave" pattern is 7,600 mm in the horizontal direction.  On the list of proprietary of retaining wall systems, three can meet the requirements for a traditional MSE type wall.  Each of these preapproved companies panels widths are not an even multiple of 7,600 mm and therefore can not create an exact copy to the pattern shown on sheet 959.  We are requesting that Caltrans consider providing a range for the "repeat" of the pattern of 7,600 mm +/- of 305 mm.         

Bid it according to the plans and specifications.

 

103. There are 8 unanswered inquiries as of 11/8/00 @ 1:30. The inquiries are #'s 78, 84, 87, 90-92, 94 & 97. Is Caltrans going to issue an addendum to clarify these issues or simply try answer them online.

Responses to inquiries will be posted as soon as the become available.

 

104. I just wanted to get confirmation that my previously e-mailed questions were received. Is it possible to send confirmation of receipt?

Inquiries are posted as they are received. If an inquiry is not posted within two working days from the day it was sent, it should be resubmitted by any of the following methods: mail Toll Bridge Program Duty Senior, P. O. Box 23660, Oakland, CA 94623-0660; e-mail duty_senior_tollbridge_district04@dot.ca.gov; fax number (510) 286-4563.

 

105. Bid Item No. 114, Concrete Pavement, Standard Plan Sheet A35C shows that the PCCP weakened plane joints are to be sealed with a poured or a compressed seal. There is no reference in the special provisions that this is required. Nor are any material specifications given in the special provisions. is it required to seal the weakened plane joints as shown on A35C? if so, where is this work paid for?

Yes, the weakened plane joints need to be sealed as shown on the standard plans. This work is paid for under Bid item No. 114, Concrete Pavement. Refer to Standard Specification Section 51-1.12 "EXPANSION AND FIXED JOINTS AND BEARINGS" for material specification on the joint filler.

 

106. Reference Section 10-1.33 Existing Highway Facilities of the Special Provisions. The last paragraph references the presence of lead paint on existing B Line, J Line, and S Line. It appears that the underside of the concrete deck on existing B Line has been painted. Has Caltrans performed sampling analysis on the painted concrete surface, and if so are the results available to the Contractor? Is it Caltrans intent to abate these surfaces before demolition?

There are no hazardous paint systems on the underside of the concrete deck at the existing "B" Line structure.

 

107. Under Work Area Monitoring, Page 124 of the Special Provisions, paragraph 3, "The airborne metals exposure, outside either the containment system or work areas, shall not exceed ...etc." What is Caltrans' definition of the limits of the work area? We are assuming the work area to be the limits of the project. Is this a correct assumption?

Answer pending.

 

108. Section 10-1.34 Bridge Removal Page 133 Paragraph H. Currently the area underneath Bridge No. 23-0015R is being used for a truck/trailer storage area. Will these trailers be relocated during the removal and replacement of the deck slab?

According to our Construction Access Agreement with C&H Sugar, dated October 11, 1999, the trailers will not be relocated during the removal and replacement of the deck slab. Attention is directed to Inquiry #80.

 

109. Section 10-1.34 Bridge Removal Page 133. Last sentence states that surfaces of existing steel to receive new concrete shall be blast cleaned in accordance with the provisions in : Clean and Paint Structural Steel "elsewhere in these Special Provisions". Is the blast cleaning paid for under Bridge Removal or Clean and Paint Structural Steel?

Blast cleaning of existing steel surfaces is paid for in "Spot Blast Clean and Paint Undercoat". See Section 10-1.81 "Clean and Paint Structural Steel" of the Special Provisions.

 

110. We have received Addendum #4 VIA facsimile on November 09, 2000. Is Caltrans sending an original addendum overnight? Are we to use the Faxed copies of Engineers Estimate page 10 & 11 in our bid proposal book?

No, Addendum #4 was not sent overnight. The faxed copy is the original addendum and the pages of Engineer's Estimate that were faxed are the ones the contractor should use in the bid proposal book.

 

111. Reference prior bid question #96 regarding permanent steel deck forms for the 23-15R bridge. Answered that permanent steel deck forms cannot be used. The second to the last paragraph on Page 323 (Section 13-1, Relations with RR Co.) of the Special Provisions states that permanent steel deck forms are required.

Answer pending.

 

112. Reference prior bid question #89 regarding early access to Span 6. It is obvious that the Contractor for the 04-013014 Contract is currently constructing the anchor in Span 6 and will have same completed within a few months. To withhold access from that area for all bidders except the 04-013014 contractor, allows said Contractor a distinct advantage since they will be able to complete Frame 2 of the viaduct under a leisurely schedule as opposed to all other bidders being faced with the intense schedule of completing the viaduct and then the drop in steel girder span from day 620 to day 800.

Answer pending.

 

113. Reference prior bid question #98 regarding the days bid times $35,000 per day for completion of Phase 2 of the Project. Answered that the Department does not see any advantage to the 04-013014 Contractor. We agree with the bidder that originally asked this question in that the 04-013014 Contractor is in complete control over when the new Westbound lanes will be opened and can use this contract as incentive to accelerate his work on the 04-013014 contract and at the same time underbid the days to his extreme advantage on this Contract. Originally the bid was set up to have the B portion of the contract apply to Phase 1 in order to insure that the viaduct was ready for traffic at the same time as the new suspension span. In that original scenario, the maximum days bid for Phase I was 695 days with another 610 days to complete Phase 2 for a tota1 of 1305 days allowable]e. (i.e. Phase 2 was not all that critical). Because the high amount of liquidated damages is extreme incentive for the Contractor to not delay completion of Phase 2, because the original scenario anticipated that the completion of the entire contract in 1305 days was satisfactory, because of the unfair advantage gained by 1 bidder, because bidding the days times a large cost per day is more of a crap shoot than competitive bidding; it is unwise to continue with an A + B type of Contract.

Please refer to response to Bidder Inquiry No. 101.

 

114. Reference prior bid question # 101 regarding the 164' falsework span over the Anchor being constructed for the 04-013014 Contract. Answered that the Contractor will be required to comply With the Plans and Specifications. Again, because the 04-013014 Contractor has control of their own project, they will allow themselves to rest their falsework on top of the anchor and Cut the falsework spans down to normal. As stated by the bidder that asked this question originally, it will take approximately 20 ea. -10' deep manufactured trusses to span 170' at a potential extra cost of some $1,000,000. Obviously, it is absurd to create this inequity in the bidding process.

Please refer to response to Bidder Inquiry No. 98.

 

115. Detail A and B show that the top layer of the welded wire mat has to be parallel with to the top of the panel. However, a letter from Lily Sun fo Caltrans dated August 14, 2000 shows that the top panel and mesh can be horizontal. We will bid the job based on the requirements described on Lily Sun's letter.

Answer pending.

 

Note:

Bidder Inquiry #2 updated 8/28/00

Bidder Inquiry #20 updated 10/24/00