February 23, 2012

 

REPORT OF THE BUILDING AND OPERATING COMMITTEE/
COMMITTEE OF THE WHOLE

 

Honorable Board of Directors
Golden Gate Bridge, Highway
  and Transportation District

Honorable Members:

A meeting of the Building and Operating Committee/Committee of the Whole (Committee) of the Golden Gate Bridge, Highway and Transportation District (District) was held in the Board Room, Administration Building, Toll Plaza, San Francisco, CA, on Thursday, February 23, 2012, at 10:00 a.m., Chair Eddie presiding.

Committee Members Present (8): Chair Eddie; Vice Chair Moylan; Directors Cochran, Fredericks, Rabbitt, Renée and Stroeh; President Reilly (Ex Officio)
Committee Members Absent (1): Director Theriault
Other Directors Present (6): Directors Arnold, Chu, Elsbernd, Pahre and Snyder; Second Vice President Grosboll

Committee of the Whole Members Present (14): Directors Arnold, Chu, Cochran, Elsbernd, Fredericks, Moylan, Pahre, Rabbitt, Renée, Snyder and Stroeh; Second Vice President Grosboll; First Vice President Eddie; President Reilly (Ex Officio)
Committee of the Whole Members Absent (5): Directors Campos, Mar, Sears, Sobel and Theriault

Staff Present: General Manager Denis Mulligan; Auditor-Controller Joseph Wire; District Engineer Ewa Bauer; Secretary of the District Janet Tarantino; Attorney David Miller; Deputy General Manager/Bridge Division Kary Witt; Deputy General Manager/Bus Transit Division Teri Mantony; Deputy General Manager/Administration and Development Kellee Hopper; Assistant Clerk of the Board Lona Franklin

Visitors Present: None

     
1.

Authorize Execution of Change Order No. 39 to Contract No. 2006-B-1, Golden Gate Bridge Seismic Retrofit Phase IIIA, North Anchorage Housing and North Pylon, with Shimmick Construction Company, Inc./Obayashi Corporation, Joint Venture, for Modifications to the Floor Beam Strengthening Details

     
  a. Staff Report

In a memorandum to Committee, Deputy District Engineer John Eberle, District Engineer Ewa Bauer and General Manager Denis Mulligan reported on staff’s recommendation to authorize execution of Change Order No. 39 to Contract No. 2006-B-1 , Golden Gate Bridge Seismic Retrofit Phase IIIA, North Anchorage Housing/North Pylon (GGB Seismic Retrofit Phase IIIA Project), with Shimmick Construction Company, Inc./Obayashi Corporation, a Joint Venture (Shimmick), for modifications to the floorbeam strengthening details.

The staff report stated that the Board of Directors (Board), by Resolution No. 2008-023 at its meeting of March 28, 2008, authorized award of Contract No. 2006-B-1 for GGB Seismic Retrofit Phase IIIA Project to Shimmick, for construction of the seismic retrofit of the North Anchorage Housing and the North Pylon, including: (1) strengthening the North Anchorage Housing and North Pylon foundations and external walls; (2) strengthening the North Anchorage Housing internal concrete frame system; (3) replacing, under continuous traffic, the Anchorage Housing concrete roof that serves also as a bridge roadway and sidewalks; and, (4) performing various modifications to utilities.

The staff report stated that the original floorbeam strengthening detail calls for attaching steel plates to the bottom of a floorbeam with one-inch diameter high strength anchor bolts drilled and epoxied into the floor beam concrete. Because the floorbeams are the primary load carrying members of the North Anchorage Housing roadway, the existing steel bars reinforcing the floorbeams must not be cut or damaged.

The staff report also stated that Shimmick must locate, by concrete penetrating radar methods, the existing reinforcing bars in the floorbeams so they can be avoided during the hole drilling for installation of the steel plating anchor bolts. The field verifications determined that the existing reinforcing bars placed during the original Golden Gate Bridge (Bridge) construction in the 1930s are at different locations than those shown on the corresponding original record drawings and would conflict with the installation of new one-inch diameter anchors. To resolve the issue, the design consultant modified the floorbeam strengthening detail by replacing the flat steel plates fastened to the soffits of the floorbeams with U-shape steel plates fastened to the vertical sides of the floorbeams away from the existing main reinforcing steel.
Finally, the staff report stated that the cost of this modified work has been negotiated with Shimmick in the amount of $278,000.00.

A copy of the staff report is available from the Office of the District Secretary and on the District’s web site.

At the meeting, Ms. Bauer briefly summarized the staff report, stating that the work covered by Change Order No. 39 is for floorbeams and structural elements of the North Anchorage House, covering the traffic deck.

     
  b. PowerPoint Presentation

In a PowerPoint presentation (PowerPoint) to Committee, Deputy District Engineer John Eberle, District Engineer Ewa Bauer and General Manager Denis Mulligan provided details regarding work already done and to be done at the North Anchorage House.

The PowerPoint displayed photographs showing roadway deck replacement activities that began in February 2012, including the first hole in the roadway deck. As of the current date, two new deck units have been installed in the northbound direction. The PowerPoint also displayed photographs of fabrication of the 78 deck units, accomplished in Napa, CA.

A copy of the PowerPoint is available from the Office of the District Secretary and on the District’s web site.

At the meeting, Ms. Bauer reported that construction is now underway at the North Anchorage House. She stated that the Anchorage House itself encloses main cables, and the roof carries the traffic across the Bridge and that, during seismic retrofitting, staff became aware that the deck needed replacing.

She stated that, in the 1980’s, the North Anchorage House did not receive a new deck, but that the District’s designer has now solved the problems that prevented construction of a new deck at that time. The deck will be replaced in 78 pieces, each approximately 10’ x 25’. Each deck unit is steel framed with reinforcing rebar and concrete. All 78 units were assembled in a warehouse in Napa, to make certain the geometry is precisely replicated. It must be exact for safety of the new roadway deck.

She continued, stating that the first unit replaced was over the North Pylon in the northbound direction. Replacement began during the night of February 10, 2012, at 10:30 p.m., and was completed by 6:50 a.m. on February 11, 2012. She noted that the time period taken on February 10-11, 2012, is the longest work window allowed for overnight construction activities. Three northbound lanes were closed and traffic shifted to allow the construction to take place. The existing unit had to be cut for removal, with the cutting taking about 1.5 hours, and loading about 2 hours.

She indicated that, prior to cutting the roadway deck, a temporary steel beam was put into place to be certain that, after the cut was made, the roadway remained supported. Painting and adjustment of bearing elements to support the deck unit remains to be completed. She stated that the hole in the roadway was closed with a temporary unit.

She reported that, on the night of February 13-14, 2012, workers removed the temporary deck unit from the hole to make the final preparations for bringing in the new deck unit that was fabricated in Napa. The temporary unit was hauled away, and the new unit put into place.

On the night of February 14-15, 2012, workers made sure that the first six deck units were absolutely accurate. The geometry of everything else to subsequently be placed will depend upon the degree of accuracy in placing the first six units. The deck unit required some adjustment and similar operations were done on succeeding nights. There are now two new deck units in place in the northbound direction.

Ms. Bauer concluded by stating that representatives of Shimmick and the designer were present during the nighttime hours when the construction activities were taking place.

     
  c. Recommendation by the Committee

Staff recommended and the Committee concurred by motion made and seconded by Directors STROEH/MOYLAN to forward the following recommendation to the Board of Directors for its consideration:

RECOMMENDATION

The Building and Operating Committee/Committee of the Whole recommends that the Board of Directors authorize execution of Change Order No. 39 to Contract No. 2006-B-1, Golden Gate Bridge Seismic Retrofit Phase IIIA, North Anchorage Housing/North Pylon, with Shimmick Construction Company, Inc./Obayashi Corporation, a Joint Venture, Hayward, CA, , in the amount of $278,000.00, for modifications to the floorbeam strengthening details; with the understanding that requisite funds are available in the FY 11/12 Bridge Division Capital Budget.

Action by the Board at its meeting of February 23, 2012 – Resolution
NON-CONSENT CALENDAR

AYES (14): Directors Arnold, Chu, Cochran, Elsbernd, Fredericks, Moylan, Pahre, Rabbitt, Renée, Snyder and Stroeh; Second Vice President Grosboll; First Vice President Eddie; President Reilly (Ex Officio)
NOES (0): None

     
2.

Status Report from District Appointees on Sonoma-Marin Area Rail Transit (SMART) Board

The Committee was directed to the District’s website at www.goldengate.org to access copies of the following:

  • February 15, 2012, Board of Directors Meeting Agenda and corresponding staff reports.

A copy is available from the Office of the District Secretary and is posted to the District’s web site.

At the meeting, Director Arnold, one of the members of the SMART Board of Directors (SMART Board), reminded the Committee members that there will be a Groundbreaking Ceremony to kick off the start of the SMART Rail and Pathway Project on Friday, February 24, 2012, at the downtown Petaluma SMART Station Depot. She reported that, at the last SMART meeting, the SMART Board purchased a bridge to replace the Haystack Bridge near Petaluma, CA, and saved approximately $12 million compared to the next best alternative.

Director Pahre, one of the members of the SMART Board, thanked District staff, on behalf of the members of the SMART Board, for rearranging Bridge District meetings to allow those District Board members and staff who wished to attend the Groundbreaking Ceremony the opportunity to do so. She added that the District played a very vital role, along with the County of Marin, in the original purchase of the Northwestern Pacific Railroad Right-of-Way.

     
3.

Status Report on Engineering Projects

In a memorandum to Committee, District Engineer Ewa Bauer and General Manager Denis Mulligan reported on current engineering projects. A copy of the report is available from the Office of the District Secretary and is posted to the District’s web site.

Action by the Board – None Required

   
4.

Public Comment

There was no public comment.

     
5.

Adjournment

All business having been concluded, the meeting was adjourned at 10:35 a.m.

     

 

 

Respectfully submitted,

s/ James C. Eddie, Chair

Building and Operating Committee