04-043934

CONTRACTOR'S INQUIRY RESPONSES NO. 1,

MAY 13, 1998



APPARENT LOW BIDDERS
BALFOUR BEATLY CONST. INC.$ 62,253,191.00
CALIF. ENG. CONTRS. & A.G. TADRES$ 63,282,515.00
AMERICAN BRIDGE CO.$ 64,745,414.00

MORE INQUIRIES

1) CALTRANS TOLL BRIDGE RETROFIT PROGRAM ADDRESS

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 Retrofit Duty Senior telephone number is (510) 286-5549, and the fax number for Contractor's inquiries submittals is (510) 286-4563

2) Would contract plan electronic files be available to contractor?

Contract plan electronic files will not be available to Contractors.

3) Coastwise trade determination for qualified barges.

"A non-coastwise qualified barge may be used as a moored stationary work platform within the territorial waters of the United States without violating the coastwise laws, provided that it transport neither passengers nor merchandise while under tow between coastwise points." Contractors have to get all the appropriate permits from the US Coast Guard.

4) Does the worker's compensation insurance for this project fall under the jurisdiction of the United States Longshore and Harbor Worker Act/or the Jones Act?

The Jones Act (46 U.S.C. & 13 et seq.) applies to seamen and shipping and does not relate to construction workers on the bridge. The Longshore and Harbor Workers' Compensation Act (33 U.S.C. & 901 et seq.) applies to employees engaged in maritime employment. A federal court decision of the Fourth Circuit Court of Appeals has held that a construction worker employment in building a bridge over navigable water, designed to benefit both traffic and navigation, is engaged in maritime employment under the Longshore and Harbor Workers' Compensation Act. (LeMelle v. B.F. Diamond Const. Co.)(1982) (674 Fed2.d 296). Under California law (Lab. Code & 3700), every employer is responsible for being insured against liability to pay workers' compensation. That responsibility is incorporated into the Department of Transportation's (Department) construction contracts under the provisions of the Standard Specifications Section 7-1.01(A)(6) that requires the construction contractor to certify compliance with Labor Code Section 3700.

5) Section 5.1-37 requires two working boats be provided and operated for the duration of the contract. Will Caltrans require the boat operator and crew members for these boats to work a full ten hour day for each working day of the contract, including Saturday, Sundays, and holidays? Will the boat crews be required if the Contractor is not actually working a particular Saturday or Sunday?

The Contractor shall provide the boats and crews for every day that the Contractor is scheduled to work including Saturdays, Sundays, and Legal Holidays.

6) Please reference Contract Specification Section 4. it is stated that the contract duration is 400 working days, which includes Saturdays, Sundays, Legal Holidays and inclement weather days. Even if the Contractor was to work multiple shifts the job would be impossible to complete on time. Will Caltrans consider extending the time of completion to a more realistic time frame, similar to the other seismic retrofit jobs (i.e. Benicia-Martinez = 825 days, San Mateo-Hayward = 760 days).

See Addendum No 1. to be issued soon.

7) The contract specifications states that all retrofit work on the outside face of the East truss must be done prior to moving the 26" gas main and prior to starting work on the outside face of the west truss. PG&E is then given six weeks or 11 % of the job duration to relocate the gas line. To work efficiently the Contractor must work both faces of a truss at the same time. Can PG&E's schedule be shortened by multiple shifts, etc. to give the Contractor more time to do this work?

No.

8) Can Work be on-going on either truss outside face during the 26" gas line relocation?

No.

9) Is the 26" gas line always active during the course of the job?

Yes.

10) The "Remarks" on page 84 of the Special Provisions state that "All lanes on the Eastbound Carquinez Bridge may be closed between 12:30 AM and 4:00 AM, Tuesdays and Thursdays only....", while the Lane Closure Charts on pages 84 & 85 show that a minimum of 2 (two) adjacent traffic lanes, both directions, shall be open for use by public traffic by 3:00 AM, Monday through Thursday. Other clauses contained in the Special Provisions impose restrictions whereby if 2 (two) Westbound lanes are open to traffic, the third lane cannot be used by public traffic traveling Eastbound.

Lane Closure Charts show only 1 lane required for eastbound and 1 lane for Westbound needed between 3:00 AM - 4:00 AM on weekdays. All lanes on the Eastbound Carquinez Bridge may be closed between 12:30 AM to 4:00 AM, Tuesday and Thursday only....,". This can only be done when a Eastbound lane is detoured onto the Westbound bridge as shown on sheet SC - 3. When two-way traffic is required on the Westbound Carquinez Bridge, a buffer lane is required to separate Westbound and Eastbound traffic. The clauses in the Special Provisions imposing restrictions on the Westbound lanes when the Eastbound lane is on the Westbound bridge are correct.

11) Section 10 -1.01 of the Special Provisions (Order of Work), states that the trestle and cofferdam at Pier # 5 must be completed by 3 - 31 - 98. Due to the Delta Smelt problem this looks improbable due to: a) With a 2 - 18 - 98 bid date and 10 days award, work would commence the 1st or 2nd week in March. b) A (30) to (12) weekly review of Cofferdam design (Section 10-1.31). c) Dredging permit required (Section 10-1.31E) to remove in place rip rap before the cofferdam work can start. A dredging plan approval takes 30 days. d) SWPPP plan needs to be submitted and approved before any work can start (Section 10-1.02). e) As the pier #5 retrofit must be completed before the 26" dia. Gas line can be relocated (Section 10-1.13, table 1), please clarify how this will occur with the existing parameters.

See Addendum # 2 for contract time extension, and deletion of the requirement for any cofferdam and trestle work to be completed by 3-31-98.

12) Can the contractor utilize the old pier piles on the West side of Pier no. 5 (in side R/W) for barge access?

The Contractor must do all the work within the terms and conditions of permits issued by the regulatory agencies. These permits are available to the Contractors during the bid period. Caltrans has not discussed the use of the old pilings with any of the regulatory agencies during the permitting process, however, the piles are located within the shallow waters and agencies are likely to be concerned if there will be any disturbances to fish habitat between March 31 and December 1.

13) Refering to Section 10 - 1.31D, can water be pumped from one excavation to another.

Pumping from one excavation to another is acceptable. The intent is to minimize the amount of water requiring treatment.

14) Can dirt be imported and placed adjacent ot Pier no. 5 ( in non-BSA areas ) for access.

The Contractor must do work whithin the terms and conditions of permits issued by the regulatory agencies. These permits are available to the Contractors during the bid period. We do not believe that placing dirt at this location is consistent with all permit requirements.

15) Reference Special Provision Section 10-1.31, "EARTHWORK" "At locations where structure excavation Type C or Type DH is shown on the plans, backfill will be measured and paid for as structure backfill in conformance with the requirements of Sectin 19-3.06, "Structure Backfill," of the Standard Specifications, except at Pier 5 on the "A4E" Line where backfill shall consist of non-hazardous soil which is free of organic material, trash or other unsatisfactory material." Does this mean we can use the structure excavation Type DH and Type H materials as Structure Backfill, except at Pier 5? If the hazardous material is tested or treated and the amount of lead is within the allowable limits, can it be used as Structure Backfill?

No

16) Reference Special Provision Section 10-1.17, "MAINTAINING TRAFFIC," Lane closure charts No. 1 & 2 Remarks "All lanes on the Eastbound Carquinez Bridge may be closed between 12:30 AM and 4:00 AM, Tuesdays and Thursdays only, for the duration of the project and as approved by the Engineer, when required in the interests of public safety." Bid item 14 - TRAFFIC CONTROL (CROSSOVER DETOUR) has a quantity for item 14 need to be adjusted or can we use the crossover detour at other times during the project?

400 Working Days as originally specified in the Special Provisions translates into 80 weeks X 2 times/week = 160 uses of the crossover detour. The crossover detour will NOT be available for the Contractor to use at other times. Be advised that Addendum #2 changes the number of working days and the definition of the working day.

17) Section 10-1.28 indicates that the paint removal debris must be disposed at a Class 1 landfill selected by the Contractor. This section is silent on who will be considered the generator of this material. We are assuming that the State is the generator. Please confirm this assumption.

The State will be considered the generator for the paint removal debris. The Engineer will be responsible for signing all the shipping manifests.

18) We are requesting the following materials information handouts referenced in the Special Provisions but not included in the bid package: a. "Existing Bridge Utilities and Maintenance equipment on Eastbound (1958) Carquinez Bridge. Called out on page 77 (SP). b. Regarding Sources of water for use. c. Hazardous Materials. Called out on page 32 (SP).

All of the referenced materials handouts are available for the Contractor's review at the Toll Bridge Program Duty Senior's desk and are not available by mail.

19) We are requesting Caltrans Record Drawing #300-07-04 for utilities details not shown on the plans. This is called out on Note #3 on plan sheet 48/555.

The record drawing #300-07-04 is included in the materials handout "Existing Bridge Utilities and Maintenance Equipment on th Eastbound (1958) Carquinez Bridge" which is available for review at the Toll Bridge Duty Senior's desk.

20) Please provide us with the list of STD manufacturers referred in Section 10-1.71, "Shock Transmission Devices."

See Addendum # 2.

21) The existing sewer line interferes with pier # 5.

The existing line will be abandoned. There is no conflict with the new sanitary line in the vicinity of pier #5.

22) Would you clarify how contaminated the material in item "Structure Excavation (Contaminated) is?

See Addendum # 3 for clarification.

23) Since the Type D item has been eliminated, will the "Structure Backfill," item be increased?

Structure excavation (Type D) has been eliminated. Structure backfill has no changes. See Addendum #3 for more information.

24) What is the level and depth of hazardous material at abutment #1 and pier #5 on the main line.

See Addendum #3 for clarification.

25) Is the CIDH (30"x 48") soil also contaminated?

See Addendum #3.

26) Is there a Buy America Requirement for this job?Is there a Buy America Requirement for this job?

There are no Buy America Requirements for this job.

27) The following Questions apply to section 10-1.71 Shock Transmission Devices a)In regards to Part 1 Manufacturer's Data Package STD Assembly Drawing - I am not clear as to the exact Caltrans Definition of the term "Assembly Drawing", could you please give clarification on the exact level of detail required for these drawings to allow us to produce them to meet the requirements?

The STD assembly drawing is a working drawing that details the components of the STD drawn at a reasonable scale on 60 pound bond paper either 11" x 17" or 22" x 34" as stated in the subsection entitled "Submittals and Working Drawings". The level of detail should be such that Caltrans as owners could identify all the parts of the STD by name, function, size and scale. The working drawings will be helpful in the inspection and testing. Detailed manufacturing drawings need not be submitted. Also refer to Section 10-1.71, Subsection "STD Assembly Drawing."

b)What is the intended time of installation of the STD's? I cannot see from the drawings, or from Section 10-1.01 Order of Work the exact proposed timings?

The installation of the devices on the east side will be completed before the relocation of the gas line from the west side to the east side. Installation of the devices on the west side of the bridge will not begin until after the gas line is relocated.

c)Drawing sheet "A4E Line (Main Span) Structure Plan No. 3 shows the identifier "A12" for the STD Retrofit in the Retrofit legend. I have identified the position of "A12" on the drawing sheets "A4E" Line (Main Span) on Structure Plan No. 1 and 5 and the expansion joints on the bottom chord of the trusses, but I do not see an "A12" on Structure Plan No. 1 at pier 5 for the other location. Have I identified the locations on the plans correctly? I infer from the detail drawings that there are two STD's at each of the three locations?

The Connection details for the Shock Transmission device are shown on sheet 253 of the Contract Plans. Please note that The exterior gusset is shown and the interior gusset is similar See note 1. Also see note 8 as location L29 is shown and location L86 is similar. The other remaining STD's are at pier 5 on sheet 195. There are two Shock transmission units at each location for a total of six to be installed. The specifications call for a spare or seventh STD to be delivered to the maintenance shop.

d) Are all seven STD's to have the same external configuration? This question has arisen in my mind while looking at Drawing sheets "A4E" Line (Main Span): Pier No. 5 - Sections No. 3 and Truss Details L29 No 1. Note 11 on sheet 253 states that the device shall not protrude more than 6" below the existing structure (from the relevant sections and details) I determine this gives an overall envelope radius of around 2'- 7". However as far as I can see, the Pier No. 5-Sections No.3 drawing sheet shows a limiting radius dimension of around 1'-6" where the STD is adjacent to the welded housing/support for the RH (West) connection of the STD to the bridge. The SSTD is of course oriented 90 degree in the two different locations and this may alleviate the problem. Please could I have information on the exact external physical envelope available into which to fit the STD?

All Shock Transmission Devices shall have the same external dimensions, so the spare unit may be substituted for any of the six installed units.

e) After our initial design checks we are a little concerned with the steel plate thickness of the cheek plates shown on Drawing Sheet "A4E" Line (MainSpan) Pier No. 5 - Details No. 2. Please could I have information on the design philosophy behind the welded housing/support for the RH (West) connection of the STD (s?) to the bridge at pier 5?

The connection of the shock transmission device to the welded assembly is through a pin. The pin hole and welded assembly is designed in accordance with AASHTO LFRD Bridge Design Specifications, 1994 Edition, Section 6.8.7, "Pin-Connected Plates".

28) Contract Specification 10-1.64 Clean and Paint Structural Steel - Measurement and Payment indicates that spot blasting and undercoat painting will be measured and paid by the square foot, while Item 145 (S-F) indicates the item to be a final pay item.

a) Will Item 145 be paid on a unit cost basis for each square foot spot blasted and undercoat painted?

Spot Blast Clean and Undercoat is a final pay item paid per square foot.

b)What are the cleaning requirements outside of the faying surface area between new and existing steel surfaces? I.e. Does the steel get cleaned 6" past each faying surface as is the case with cleaning weld lines?

Only the faying surfaces require cleaning and undercoating. There is no requirement to clean outside of the faying surfaces. To obtain cleaning over the full contact area, cleaning beyond the contact area may be required. However, quantities are based on the contact surface area only.

29) We refer you to sheet 176 of 555 of the contract drawings. Under what bid item does the installation of the prestressing strands to anchor the steel anchor beams at pier 3 get paid?

Installation of prestressing strands at Pier 3 are paid under Item 95. Item Code 500010

30) We refer you to sheet 157 of 555 of the contract drawings; support beam detail. How can the contractor install the line of bolts where the nut is situated inside the beam?

Nuts inside the support beam must be placed before closing the support beam. The designer suggests trapping the nuts in place.

31) We refer you to sheet 471 of 555 of the contract drawings: Under what item does the coring and the installation of the H.S. Rods for the column casings get paid?

Installation of HS rods on approach span column casings is paid under items 96 and 97, Codes 046823 and 046824 respectively. Coring and pressure grouting of holes for HS rods is paid under items 116 to 120, Codes 046830 to 046834 respectively, depending on core diameter.

32) Are the bearing pads for the approach structures to be bonded to the masonry and sole plates?

The bearing pads do not need to be vulcanized to the plates.

33) As the pier 5 retrofit must be completed before the 26" diameter gas main can be relocated (Section 10-1.13, table 2), please clarify how this work will be occur with these parameters?

SEE ADDENDUM NO. 5 for minor erection work over the gas line provided a protective cover is built over the gas line. Please see addendum for specifics.

34) Referencing Detail A and Section B-B of sheet 315 of 555. Section B-B calls for two rows of rivets to be removed.Notes and quantities shown on the Bottom Lateral Bracing Drawing seems to refer to the existence of only one(1) row of rivets. Detail example: Plan-Outside Connection Upper Gusset on Sheet 304 of 555, draws our attention to note 4 - See detail A on "Bottom Lateral Bracing Details" sheet, but the called out rivet quantity (6) only reflects the number of rivets found in a single row. Please clarify.

Section B-B from Detail A shown on sheet 315 of 555 ("Bottom lateral Bracing Details") is clarified as follows. The leader pointing from the note "Remove existing rivets (>2 ply) and install HS bolts (A325X)" should only point to the lower row, instead of both the upper and lower rows, The "As-Built" condition is rivets in the lower row, bolts in the upper row.

35) Reference Special Provisions Section 10-1.47: High Strength Threaded Rods to be grouted into cored holes will be paid for as Miscellaneous Metal (Bridge). Please confirm bearing plates and nuts will also be paid for as "Miscellaneous Metal (Bridge)". Please note that Special Provision Section 10-1.72 does not identify the above items as being involved in that pay item.

The second paragraph of Section 75-1.02 of the Standard Specifications lists threaded rods as Miscellaneous Iron and Steel items which conform to ASTM A 307 and for high strength ASTM A 449. The first paragraph of Section 75-1.03 references Miscellaneous Metal Bridge back to Section 75-1.02. Threrefore the Threaded rods pressure grouted in cored holes and the plates and nuts attached to them shall be paid as "Miscellaneous Metal Bridge" per the special provisions and the Standard Specifications.

36) On sheet 319 of 555 (Shear Lock Elevation - Piers 2 & 4). Designer shows an upset rod with 6-1/2" dieter ends (Detail B) installed in 6" diameter hole (Section A-A). If the the 6-1/2" dimension holds is there enough room?

The hole for the upset rods should be increased to 6-5/8" diameter.

37) Will Caltrans consider allowing Contractors to use the existing air supply on the bridge if it is boosted?

The specifications require that Contractors supply their own air supplies.

38) The Contract Specifications State that all retrofit work on the outside face of the east truss must be completed before moving the 26" diameter gas main and before starting work on the outside face of the west truss. Please define the members consisting of the outside face of the truss.

The West Face is defined as the connections at and the members between the "L", "ML", "MM", "M", "MU" and "U" JOINTS ON THE WESTERN SIDE OF THE BRIDGE. This restriction prevents working over the active gas line, which could be damaged by falling materials. Currently an addendum is being issued to allow minor erection work over the gas line. See addendum for requirements.

39) Section 10-1.64 "Clean and Paint Structural Steel" of the Contract Specifications states that "at locations where stiffeners are added to the existing steel members without the removal of any existing steel, the existing steel area below the stiffeners need not be dry blast cleaned but shall be steam cleaned.". Based on this statement, can we assume that the existing area below the new stiffener angles (on the top/bottom chords, truss, and on gussets) need not be dry blast cleaned?

Angles which are added to members without removing any existing steel do not require dry blast cleaning, except where required to be slip critical as noted by "A325SC" on the plans. In this case the clean and paint provisions specific to slip critical bolting apply.

40) Reference Specification section 10-1.71, Shock Transmission Devices, Section 3, Execution. The Contractor is asked to submit "Ten copies of the Qualification Data Package....with the Contractor's bid." Each copy of this data is in a one and one half inch three ring binder. ten copies would make a substantial size bid package. Due to the size of this documentation could we submit one copy at bid time and the remaining nine copies to follow for the low three bidders?

See Addendum No. 5

41) Reference Plan Sheet 140- "QUANTITIES AND GENERAL NOTES". On the "A4E" Line (Main Span) the quantity for Structure Concrete, Bridge is shown as 3,900 cy and Structure Concrete Bridge Footing is 860 cy. After completing a take-off on Structure Concrete, Bridge my quantity is 860 cy less than what is shown on the plans. I would like you to check if maybe the Structure Concrete, Bridge Footing was added to the Structure Concrete, Bridge by mistake. Please check?

The quantities have been reviewed and there have not been any errors found. The quantities are taken off by two individual estimators and both calculations were found within the actceptable limits. Quantity calculation and quantity check calculations validate the 3,892 cy quantity of Structural Concrete, Bridge, and 860 cy of Structural Concrete, Bridge Footing for the A4E-Line Main Span.

42) Reference Plan Sheet 436- INDEX TO PLANS On the "A4E" Line (Approach Span) the quantity for Structure Concrete, Bridge is shown as 1,880 cy. After completing a take-off on the Structure Concrete, Bridge my quantity is greater than what is shown on the plans. I believe the concrete at Abutment 2 may have been left out of the 1,880 cy shown on the plans. Please check?

Quantities calculation and quantity check calculation validate the 1877 cy quantity of Structural Concrete, Bridge for the A4E-Line Approach.

43) On page 181 of the Special Provisions, it states "At locations where stiffeners are added to existing steel members without the removal of any existing steel area below the stiffeners need not be dry blast cleaned but shall be steam cleaned in accordance with Section 59-2.05. "Steam Cleaning," of the Standard Specifications." As a representative example, note the runs of angle shown below on a portion of the Design Drawing (page 244 of 555) found at location M17. Please confirm that the angles used to strengthen existing members, such as the example shown at the M17-M18 member do not have to be dry blast cleaned.

Angles attached to members or along the free edges of gusset plates that do not have any slip critical bolts may receive steam cleaning only, dry blast cleaning is not required. Where an angle or plate has any slip critical bolts, the existing surface under the entire angle or plate shall receive dry blast cleaning.

44) Special Provisions Section 10-1.28A refers to As-Built Plans for wooden stairs shown on sheets entitled "East Carquinez Bridge, maintenance Safety Improvements - walkway and stairway at Abutment No. 1". We are requesting a copy of these plans.

All as-built plans are available at the District Toll Bridge Duty Senior's Office. Contact Yader Bermudez by phone @ (510) 286-5549 for information.

45) On page 97 of the Special Provisions regarding the Maintenance Travelers being unsafe. What is unsafe about the travelers in their current condition?

The travelers are reported to have been constructed with aluminum components connected with structural steel bolts. Corrosion between the two materials has degraded the connections to the point that they are unsafe and are no longer used by the state. No representation is made regarding the condition or suitability of other portions of the travelers.




Caltrans Toll Bridge Seismic Retrofit Construction Program always welcome any comments or suggestions.
Author: Yader A. Bermudez
Email: Bernie_Edrada@dot.ca.gov