11-029124

CONTRACTOR'S INQUIRY RESPONSE, No.1

JULY 29, 1999

 

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.

CALTRANS TOLL BRIDGE - DISTRICT 11 ADDRESS

The Caltrans District 11 Office is located at 2829 Juan Street, San Diego, CA 92110. The mailing address is P.O. Box 85406, San Diego, CA 92186-5400. The District 11 Duty Senior telephone number is (619) 688-6635. Please submit all inquiries by fax to (619) 688-6988 or by email to Duty_Senior_Const_District11@dot.ca.gov.

Inquiry No. Inquiry
1
Per Section 10-1.38 VISCOUS DAMPING DEVICES of the Special Provisions, please provide the list of pre-qualified suppliers as determined by the State of California.

Per requirement 1., there are two pre-qualified suppliers.
TAYLOR DEVICES, INC.
90 Taylor Drive
North Tonawanda, NY 14120
(716) 694-0800

ENIDINE, INC./ ENIDINE WEST
212 Technology Drive, Suite M
Irvine, CA 92718
(949) 727-9112
2
Page 2 of the IMPORTANT SPECIAL NOTICES states that the contract work day count will start on the first working day after contract approval. Section 4 states that it will start on the 15th calendar day after approval of the contract. Please resolve.

An addendum(#1) will be issued to revise Section 4-BEGINNING OF WORK, TIME OF COMPLETION AND LIQUIDATED DAMAGES.
3
Section 10-1.07 TRANSPORTATION FOR THE ENGINEER, will one boat operator/ crew be required for the project or one for each boat for a total of two?

An addendum(#1) will be issued to revise Section 10-1.07.
4
Should Item 31 and 32 be final pay quantities?

An addendum(#1) will be issued.
5
In regards to the "Materials Information Handout" specifically the DEPARTMENT OF FISH AND GAME, Notification # 5-011-98. Condition #4 states that not more than one acre of the eel grass will be impacted. What portion of this will be available to the contractor for temporary access needs?

The referenced agreement between the Department of Fish and Game and the Department of Transportation authorizes not more than one acre of eel grass habitat shall be impacted within the WORK ACCESS BOUNDARIES.
6
In regards to the "Materials Information Handout" specifically the DEPARTMENT OF FISH AND GAME, Notification # 5-011-98. Condition #4 refers to a document pertaining to eel grass restoration. Please make this document available to the contractor.

The referenced document will not be available to the contractor. Any impact to the eel grass habitat within the WORK ACCESS BOUNDARIES shall be the responsibility of the State of California Department of Transportation to restore and monitor per the requirements of the agreement.
7
Please advise which bid/specification includes the supply of the 1 3/8" diameter prestress anchor bars to be pressure grouted in cored holes in column caps (i.e. Section B-B, Sheet 74 of 411).

An addendum (#2) will be requested to clarify payment of the prestress anchor bars. Bid it as you see it unless an addendum is issued.
8
Please clarify if temporary lateral bracing at each pier (described in Sec. 10-1.20B) is to remain in place until all of the isolators in all of piers have been installed and then removed simultaneously.

Once the bearings are installed and the jacks released (i.e. all the bearing replacement operations have been completed for the bent) the temporary lateral bracing may be removed. There is no need to wait until all the bents are completed. See Section 10-1.01 "Order of Work" for further information.
9
The distributed copy of Sheet 76 of the contract drawings is missing some of the left side of the sheet and therefore it's missing the overall height of the column cap for Piers 12 through 14. Please identify this dimension on the Elevation View.

An addendum has been requested to provide a complete replacement sheet. Bid it as you see it unless an addendum is issued.
10
Our takeoff quantity for Item 60, Marine Plywood, significantly exceeds the bid quantity. Please confirm the accuracy of the bid quantity.

There appears to be an error in the quantity for Item 60, Marine Plywood. An addendum has been requested to correct the item quantity. Bid it as you see it unless an addendum is issued.
11
Our takeoff weights for Item 66, Miscellaneous Metal (Restrainer -Cable Type) significantly exceed the bid quantity. Please confirm accuracy of the bid quantity. Are the anchorage assemblies shown on plan sheet 152 of 265 intended to pay under this item ( or under structural steel)?

Quantities for Miscellaneous Metal (Restrainer -Cable Type) include cables, swaged fittings, studs, nuts, disc springs and sperical washers as stated in Section 10-1.51, Miscellaneous Metal (Restrainer -Cable Type) of the Special Provisions. Anchorage assemblies as shown on sheet 152 of 265 are included in the structural steel items.
12
Which restrainers are intended to pay under Item 67, Miscellaneous Metal (Restrainer -Rod Type)? Is it intended that anchorage assemblies pay under this item ( or under structural steel)?

There appears to be an error in the quantity for Miscellaneous Metal (Restrainer -Rod Type). An addendum will be requested to correct the item quantity. Bid it as you see it unless an addendum is issued. Brackets, plates and other steel items associated with restrainer anchorage are included in the structural steel items.
13
We have been detailing the Coronado Bridge isolation bearings. Our optimum bearing is 19.875". This bearing meets all the requirements of the specification but because of the slope of the bridge there is a clearance problem at 7 of the 52 bearing locations. We would like to use 1 1/2" grout pad. The maximum depth of concrete removed would be 1.3" at 3 locations, 2.1" at 1 location and 1.1" at 3 locations. Could you please check with the designer to see if this installation procedure is acceptable?

Concrete may be removed provided all the following conditions are met:

a) Removed concrete is replaced with concrete or non-shrink cementitious grout.
b)The removed material shall not extend below the top of the existing reinforcement.
c) The concrete cover shall be replaced with a thickness of approved material that is not less than 2".
d) The perimeter of the vertical edge of the removed material shall be coated with an approved epoxy bonding agent just prior to casting the replacement material.
e) In determining the height of the isolator assembly, the bidder shall assume that the existing cover could be as low as 1.5".
f) The clear space between the existing plate girders and the piercap is approximate and may be different than that shown on the As-Built plans. Therefore the bidder should allow for some reserve.
g) The bottom steel plates shall not be in a "trough" where water can collect.
14
See Note 2 on Plan Sheet 57 of 411 (which requires the Contractor to provide vertical joint location of the footing skirt panel for approval by the Engineer). What is the intent of this note?

It appears that this note is not applicable to the skirt panel detail. An addendum will be requested to remove this note. Bid it as you see it unless an addendum is issued.
15
See Plan Sheet 78 of 411, Section B-B. The bend on the #9 bar (through the column cap) will not facilitate placement of the coupler.

Not all mechanical couplers will work in this situation, but there are some that are short enough to fit.
16
See Section 10-1.23, Piling, of the Special Provisions. Will initial installation of piles (15' max penetration) by vibratory hammers and/ or minor dredging around pier 2-4 piles be allowed?

Vibratory hammers are not allowed by the special provisions. Local dredging around pile locations is not permitted because of the detrimental effect on pile capacity.
17
We request that the Friction Pendulum Bearing be added as a permitted isolation bearing on page 116 of the Special Provisions.

The Friction Pendulum Bearing was considered for use on this project but it was determined that the friction pendulum bearing does not meet the seismic design displacement requirements for this project.
18
Is it required that every pile on the project be redriven after filling with concrete to the bottom of the reinforcing steel?

Per Special Provisions Section 10-1.23, all piles are to be redriven after filling with concrete to the bottom of reinforcing steel.
19
Is a construction joint required at the bottom of the reinforcing steel (none shown in the plans)?

It is expected that a construction joint will be necessary at the bottom of the reinforcing steel in order to redrive the pile and to insure that the reinforcing steel is placed at the correct elevation in case additional pile penetration is necessary.
20
See Plan Sheet 189 of 411. Does Section A-A apply to the entire suspended span (from CL tied hinge to CL of expansion hinge)? Please clarify.

Section A-A applies only to the cross-frame on the suspended span side of the expansion hinge. For clarification, see "Longitudinal Elevation" view on Plan Sheet 186 of 411.
21
With what software is the "CPM" compatible. i.e. Microsoft "PROJECT" etc. And is the "MANAGER PAD" device compatible with a "PALM III" handheld device? Or its software?

Information regarding the Primavera Project Planner software can be obtained from Primavera Systems, Inc - Technical Support Department at (610) 668-3030 or at http://www.primavera.com/.
22
Will the Caltrans storage yard just south of Pier 2 be available for contractor's use?

As per Section 5-1.35 AREAS FOR CONTRACTOR'S USE of the Special Provisions: No area is available within the contract limits for the exclusive use of the Contractor.
23
Has testing been performed to identify the existence and concentration of regulated heavy metals in the existing paint? (structural & miscellaneous metals requiring modification)

No test results are available, refer to Section 10-1.20 EXISTING HIGHWAY FACILITIES of the Special Provisions for information regarding the containment of debris produced when the existing paint system is disturbed.
24
See Plan Sheet 392 of 411, Note at the bottom right of the sheet. The note reads: "The removal of air and water plugs and installation of valves and adators also applies from pier 18 thru pier 21, Typ."
a) The plans show no details for mechanical work from piers 18 to 21. Please provide.
b) What is an adator?


a) The note simply states that the removal of air and water plugs and installation of valves and adaptors is also to be done at piers 18 through 21.
b) "Adator" is a misspelling for "adaptor".
25
The drawings indicate a paint system on Plan Sheet 74 of 411 to be applied to the piles. Please indicate which paint system is required.

The paint system for the piles is addressed in Section "Open Ended Cast-In-Steel Shell Concrete Piling" of the Special Provisions.
26
An explanation is needed to clarify traffic flow into and out of Coronado. For example, how many lanes are needed for morning commute into Coronado or San Diego. A traffic flow schematic would help clarify charts 1 & 2 on special provisions page 84.

The San Diego - Coronado Bay Bridge has five (5) lanes total, the following lane configuration is the normal schedule for the movable barrier. The hours listed are standard except when Maintenance operations require minor deviations from the hours listed, refer to Section 10-1.06 COOPERATION of the Special Provisions.

Monday through Friday
1200 AM to 830 AM 3 lanes northbound and 2 lanes southbound
930 AM to 530 PM 2 lanes northbound and 3 lanes southbound
630 PM to 1200 AM 3 lanes northbound and 2 lanes southbound

Saturday and Sunday/ Designated Legal Holidays
1200 AM to 1200 AM 3 lanes northbound and 2 lanes southbound
27
    Note: Whenever the word "BIDDER" is used the response shall include all subcontractor, subsidiaries and suppliers of the prime contractor.
The requirement imposes an unreasonable burden on the bidder especially with respect to subcontractors, many of them will not be known until minutes prior to bid submission making it virtually impossible to include their responses to the lengthy questionnaire with the bid. We request that the time for submission of subcontractor and supplier responses to the questionnaire be extended to noon on the 2nd business day after the bid opening.

No. Bid it as you see it.
28
The BRIDGE SEISMIC RETROFIT INFORMATION/QUESTIONNAIRE indicates that the document "shall be included with your Bid Proposal". In as much as some of the question items pertain to work potentially subcontracted and given that the low sub may not be known until near the bid hour, would it be possible to turn the questionnaire in by August 2, as part of the post-bid meeting requirement instead?

No. Bid it as you see it.
29
Please be more specific on what kind of citations or violations you need information on. Is this for Caltrans projects only? Is this for the parent company and all of it's subsidiaries or just the bidding entity?

Question Number 1 of the BRIDGE SEISMIC RETROFIT INFORMATION/ QUESTIONNAIRE requires the bidder to provide information and ultimate disposition for any citations issued by any government entity for any safety related violations on previous highway or building constuction projects. The definition of "previous projects" is not Caltrans inclusive. Per the QUESTIONNAIRE the word "bidder" is defined to include all subcontractors, subsidiaries and suppliers of the prime contractor.
30
As shown on sheet 44 & 352 of 411, and special provisions Section 10-1.10. Portions of the Abutment 1 new pile cap (south) and transverse beam conflict with conduits and the comm. pull box in the vicinity of vaults 11& 12. These facilities are not shown to be relocated. Please resolve.

Bid it as you see it per the plans and special provisions.
31
As shown on sheet 10 of 411 and special provisions Section 10-1.10. Please provide a schedule and alignment for relocation of the other utilities that conflict with Abutment 1 work i.e. two fiber optic cable and Cox/TCG fiber optic cable.

Bid it as you see it per the plans and special provisions.
32
As shown on sheet 10 of 411 and special provisions Section 10-1.10 on page 82 paragraph 7. This utility shows on sheet 10 to conflict with the Abutment 1 work. How can we wait until contract completion for it to be relocated? Please provide a schedule and alignment for a relocation prior to Abutment 1 work.

Bid it as you see it per the plans and special provisions.
33
The specs are silent on will who be the "generator" or the responsible party for the disposal of lead contaminated soil, lead paint debris, and creosote timber. Will the State be the GENERATOR and the responsible party? Will the State sign the manifests for the transportation and disposal of the materials?

Yes, the State is the generator and the Resident Engineer will be responsible for signing all shipping manifests.
The following issues (next three questions) are in regard to the viscous dampers:

34
The prototype test 3, specified as "+/- 2 inch stroke at a 2.5 second period for 200 sinusoidal cycles" of the Special Provisions cannot be performed on dampers. The energy dissipated during this test will exceed the capabilities of the damper by a large factor. This test should be revised to a lower frequency or deflection consistent with the measured frequency/deflection of wind cycling under fully damped conditions.

Bid it per plans and specifications.
35
All testing must be performed at SRMD at UC San Diego. An option to perform the testing at a lab other than the one specified would save a significant amount of time and money. We are greatly concerned with the availability of the test lab. Any delays in testing would seriously impact the construction schedule for this project. The manufacturer should at least be allowed to select a suitable testing lab for the proof testing.

Bid it per plans and specifications.
36
The piston rod material has been specified as 316 stainless steel. While the use of stainless steel is essential, the 316 grade of stainless (steel) is difficult to machine, very low strength material (35 ksi) and should not be used for piston rod. Other stainless steels such as 17-4PH are more appropriate for use as piston rod material. Therefore, the number "316" should be removed from the specification.

Bid it per plans and specifications.
37
Who pays for isolation bearing testing?

The isolation bearing testing is paid for by the State.
38
Refer to Section 10-1.31, Core Concrete of the Special Provisions. The Special Provisions or plans do not say to avoid coring through reinforcing steel, however, the Special Provisions say the item includes full compensation for repairing any damaged reinforcement. Will reinforcement have to be repaired if it is damaged?

The Special Provisions or plans do not require repairing damaged reinforcement when coring concrete. Bid it as you see it.
39
Section 5-1.43 PERMITS AND LICENSES of the Special Provisions lists a permit from the Coast Guard, is this available to the contractor?

As stated in paragraph three of Section 5-1.43, the Coast Guard Authorization No. 017-98 is available from the Department of Transportation, Bids and Documents (916) 654-4490 or may be viewed at the office of the District Director at 2829 Juan Street (619) 688-6635. The document is also available by request at (619) 688-6635 or FAX (619) 688-6988.
40
In the Special Provisions page 155, no stiffness requirements are given for plastic lumber members 6" X 12" and 8" X 8". Please supply these values.

The stiffness requirements are missing for 6" X 12" and 8" X 8" members. There is not enough time to issue an addendum at this point. Bid it as you see it.
41
See item #67 Miscellaneous Metal (Restrainer-Rod Type). The estimated quantity has been revised by Addendum 2 with no reason given in the addendum. What is the basis for this reduction in quantity?

The quantity for Miscellaneous Metal (Restrainer-Rod Type) was changed to remove the prestressed rod quantity from the Miscellaneous Metal (Restrainer-Rod Type) item and add it to the "Prestressing Cast-In-Place Concrete" item. This conforms to the Special Provisions, Section 10-1.25 "Prestressing Concrete" which states that the prestressing material is included in the "Prestressing Cast-In-Place Concrete" item.
42
Refer to page 162 of the Special provisions regarding the Miscellaneous Metal (Restrainer-Corrosion Resistant Cable Type) specification. Are there any pre-approved suppliers of this corrosion resistant cable with the mentioned coating?

No. There is no pre-approved list of suppliers for this product.
43
Refer to pages 92 and 93 of the Special Provisions. Under "Raise Bridge" reference is made to the "...Contractor's working drawings detailing permanent strengthening or stiffening members...". In Section "10-1.20C Temporary Lateral Bracing (Cross Frames)" it says that "Drilling or welding temporary lateral bracing to main girder web or flanges will not be permitted." Will drilling or welding to main girder web or flanges be permitted to strengthen the girders at the jacking points?

Section "10-1.20C Temporary Lateral Bracing (Cross Frames)" is for the temporary lateral bracing only. The contractor is responsible for any changes to the structure required due to jacking loads, including stiffening existing members. Any stiffening system at the jacking points shall be submitted as shop drawings and approved by the Engineer before constructed.
44
Refer to page 106 of the Special Provisions. Under "Concrete Structures" reference is made to a roughened concrete surface with an amplitude of approximately 1/4-inch. Please clarify the 1/4-inch amplitude specification for roughened concrete surfaces. Is it a profile or a removal? The only locations shown on the plans is at the column caps. Is this correct?

The 1/4-inch amplitude roughening of existing concrete surfaces is a "profile" type roughening. The only locations that require roughening are those shown on the plans.
The following (7) questions are in regard to Viscous Dampers. Please refer to page 132 "Testing" of the Special Provisions regarding testing of the viscous dampers.
45
Who will pay for testing of the viscous dampers at SRMD at the University of California, San Diego?

Bid it per plans and specifications.
46
How can Caltrans ensure that damage will not be caused to dampers by testing them at a laboratory that has no previous experience testing dampers of this capacity?

Caltrans personnel will be on site during testing at SRMD. The manufacturer may also have a representative at the testing site. Damage caused to the damper by the testing facility, will be the responsibility of the State, except for dampers that have design or manufacturing defects.
47
How will Caltrans ensure that the dampers are tested in a timely fashion?

There is a time allowance for testing in the Special Provisions. Should the time allowed for testing be exceeded through no fault of the damper manufacturer, the State shall be responsible for such delays. However, the Contractor shall comply with all coordination requirements prior to testing of the viscous dampers.
48
If the testing takes longer than the time specified in the Special Provisions due to circumstances beyond the control of the damper manufacturer, will an extension of time be granted?

Should the time allowed for testing be exceeded through no fault of the damper manufacturer, the State shall be responsible for such delays.
49
Please confirm that employees of SRMD will take full responsibility and liability for uncrating the dampers and loading them in the test rig, testing the dampers, and for recrating the dampers after testing is complete. Also, please provide documentation of appropriate insurance coverage by the chosen laboratory, for the responsibility and liability of the devices.

The State shall be responsible for damage of the dampers at the SRMD facility, except for dampers that have design or manufacturing defects or have been previously damaged.
50
Please provide information regarding the "mechanical restraint" that is referred in the section titled "Measurement and Payment" on page 134 of the Special Provisions but is not shown on the Plans.

Mechanical restraint refers to the clevis plates shown on Plan Sheet 116 of 411.
51
Since the damper manufacturer is responsible for providing any "mounting apparatus or adapter brackets to accommodate the SRMD test rig", please provide dimensional information regarding the configuration of the SRMD test rig so these items can be included in the price of the dampers.

Please contact the SRMD facility for this information.
52
Refer to Item 50, Furnish Structural Steel (Scaffolds). Does the quantity for the fixed bid item 50 (F) take into account stiffener plates on both sides of the bridge?

The furnish structural steel (scaffolds) quantity shown in the Engineer's Estimate has been verified and is correct. This work is at both sides of the bridge as shown on the plans.
53
According to Bid Item 64--Spot blast clean and paint undercoat (scaffold)--there is 15,470 sqft of scaffolding that requires this process. Yet, if this process is done for all refurbished scaffolding connections and new steel, the quantity is considerably less. Should this process be done to all existing scaffolding? Does this process pertain to new scaffolding (even though the special provisions do not call out for this process to be executed?)

The quantity for Bid Item 64--spot blast clean and paint undercoat (scaffold) is correct. It includes the connections to existing steel as shown on Sheet 348 of 411 of the contract plans.
54
Refer to pages 158 to 160 of the Special Provisions, Section "Clean and Paint Structural Steel". The painting of the structural steel and blast cleaned areas are only to be painted after erection. Will painting of scaffolding be allowed prior to hanging from the bridge? Can the scaffolding be finish coat painted in the shop and touched up in the field after erection?

Bid it per plans and specifications. You may propose this change to the Resident Engineer for approval.
55
Refer to Plan Sheet 341 of 411, I can't find a manufacturer for 2 1/4" dia x 1" wheel with a 700 lb. capacity as shown on this sheet. Refer to Plan Sheet 340 of 411, I can't find a manufacturer for 4" dia x 1 1/2" and 2" wheel with a 2000 lb. capacity as shown on this sheet.

A higher capacity wheel may be substituted as long as the clearances shown are not encroached upon. However, those wheels that are limited by clearances may need to be manufactured as shown on the plans. The clearances given on the plans shall be used to avoid interference with moving parts.
56
Refer to Plan Sheet 325 of 411, View Z-Z. What length of the new wire rope is required and what does it attach to at the top end?

The new wire rope shown in View Z-Z is connected to the break systems in the Mechanical Plans, Sheet 400 of 411. The length of wire rope shall be determined from the As-Built plans and existing scaffolding in the field.
57
Refer to Plan Sheet 318 of 411. Is the 1" x 6" Toeboard to be pressure treated as other toeboards are and can a 2" x 6" toeboard be substituted?

Bid it per plans and specifications. You may propose this change to the Resident Engineer for approval.
58
Refer to Plan Sheet 349 of 411. Are the Thrust Wheel Guides shown required at all hinge locations or are they only required at spans 2 and 4?

The Thrust Wheel Guides shown are required at spans 2 and 4.
59
The vertical stiffness for the isolation bearings is required by the contract documents to be a minimum of 12,400 kip/inch. The calculations for our proposed bearing give us a vertical stiffness of 10,881 kip/inch. Is this acceptable?

Bid it per plans and specifications. You may propose a variation for the vertical stiffness of the isolation bearing to the Engineer for approval.
60
What is the Labor Rate for Crew Boat Operator and Deckhand?

The following rates are as listed in a recent agreement of the Inlandboatmen's Union of the Pacific, Southern California Region Marine Division of the ILWU and acknowledged by the US Department of Labor.

Basic Rate + Fringes
Crewboat Operator $24.84 Pension: $2.23. Health & Welfare: $3.84
Deckhand $21.94 Pension: $2.23. Health & Welfare: $3.84
The State will be requesting a conforming wage rate from the California Department of Industrial Relations, Division of Statistics and Research.


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