Transbay Transit Center San Francisco, CA CMGC Contract No. 08-04-CMGC-000 Project No. 30100 BID PACKAGE TG19.1 DATE: 10/15/2010 TO: FROM: BID DATE: All Potential Bidders Webcor/Obayashi Joint Venture October 20, 2010 at 2:00 PM COMMUNICATION WITH WEBCOR/OBAYASHI JOINT VENTURE At no time during the bid process (defined as the time between issuance of the IFB until award of Subcontract to Trade Subcontractor) shall Trade Subcontractors contact any person(s) or staff of the TJPA, TJPA Program Management/Program Controls (PMPC) team, Webcor/Obayashi Joint Venture, CM Oversight (CMO), or other TJPA Consultants regarding the IFB. The only contact is for submission of questions using the contact directions below. Submit questions using the s on Bid Documents (QBD) form through Webcor/Obayashi Joint Venture. Refer to the Project Bidding Manual for the QBD form. E-mail Webcor/Obayashi Joint Venture at TransbayBidding_TG19.1@webcor-obayashi.com. Fax Webcor/Obayashi Joint Venture at (510) 476-3005. Reference the Project Bidding Manual, Section III.B.1 regarding document availability and how to obtain the documents. 10/15/2010 Page 1 of 2
Trade Package TG19.1 301 Mission Interim Screen Wall TRANSBAY TRANSIT CENTER PROJECT San Francisco, CA MODIFIED DOCUMENTS PER The items listed below make up the TG19.1 (301 Mission Interim Screen Wall) Bid Package Addendum 03. This Addendum shall supersede all previously issued Bidding Documents wherein it contradicts or modifies the same. All other conditions and requirements remain unchanged. The changes, additions or deletions as set forth herein shall apply to the above bid and shall be made part thereof as though originally shown and/or specified. Documents associated with TG19.1 Addendum 03 revisions a. TG19.1 s and Answers # 1 b. TG19.1 s and Answers #2 END OF 10/15/2010 Page 2 of 2
No. 0001 0002 0003 0004 Submission Date 10.11.2010 There are currently (E) light fixtures in the (5) planter boxes. Are we required to stub up electrical conduits for the future installation of light fixtures in the planter boxes? 10.11.2010 Please provide "Architect Approved" stone support system, anchors, and accessories for the stone walls. 10.11.2010 Please provide manufacturer & specs for the stone panels. 10.11.2010 Please provide the locations where the (N) in ground lights will be reconnected to. Electrician needs to know where the (N) in-ground lights will receive power. TG19.1-301 Mission Screen Wall - Issued for Bid Response Contractor shall locate, cut, and cap all existing electrical lines feeding existing lights within existing planter boxes. Prior to removal of the planters, the contractor shall verify the location of existing electrical lines within the limits of work. Cutting and capping of existing electrical lines shall occur at the face (north) of the new interim screen wall and shall facilitate the future use and connection to reinstalled planter boxes (and lights) by others at a future date. See Note 3 on Drawing C-2000. Contractor shall propose stone support systems, anchors and accessories that comply with requirements of the Contract Documents; Architect to approve. New stone panels shall match existing stone panels. All available information on existing stone panels has been provided on the drawings. Contractor shall submit manufacturer and specs of new stone panels to Architect for approval. Contractor shall disconnect existing underground electrical lines servicing existing inground lights and reconnect existing electrical lines to new in-ground lights. New in-ground lights shall be inset into asphalt pavers/topping slab. New in-ground lights shall be located at new wall slots (4 total) and shall be placed between the face (north) of the new wall and the new concrete curb. See Note 10 on Drawing C-2000. 0005 10.11.2010 Please provide specifications for the (E) in-ground lights. Require specs in order to match manufacture, size, and model type. Existing electrical power source servicing existing in-ground lights shall be located in field; locating and shut-off of existing power source will be coordinated with TJPA Representative. Type, model, size, and manufacturer of existing in-ground lights to be determined in field by the contractor. Contractor shall submit manufacturer and specs of new in-ground lights to the TJPA Representative for approval. October 13, 2010 TG19.1 301 Mission Screen Wall - Bidder Q&A Response Set No. 1 Page 1 of 1
s are numbered in the order received. TG0019.1-301 Mission Screen Wall - Issued for Bid No. 0006 0007 0008 0009 0010 Submission Date 10.15.2010 Reference drawing sheet C-2000. Note 10 calls out Contractor to disconnect (E) underground electrical line servicing (E) inground lights and reconnect to (N) in-ground lights. There are no as-built drawings shown (E) conduit routing and depth to determine if additional demo of concrete or excavation for conduit routing is required. Please provide additional information. 10.15.2010 Reference drawing sheets S-4000 and S-5000. On wall elevation A on sht S-4000 and detail 2/S-5000 the #6 verticals are referred to as nelson studs. Are the #6 verts to be welded to the (E) embed plate? If so, what are the welding requirements? If the (E) embed is not continuous or does not exist, do the #6 verts get drilled and epoxied into the (E) concrete? 10.15.2010 Reference detail A/C-5000. Note calls out for (E) chain link gate to be removed and relocated. Drawings do not show where the gate shall be relocated or if additional fenceing is required. Please clarify. 10.15.2010 Reference details A/A-600 & B/A-6000. In details A & B, the drawings show a 1/2" joint between the aluminum composite panel and the epoxy set stone panel with no sealant. The (E) wall joint is caulked with sealant. Should this joint be sealed? 10.15.2010 Reference details A/A-6000 and D/A-6000. The drawings call for the wall on the Transbay Terminal side to receive 16GA galv. coated G90 rolled stell panels. The (E) wall looks to be plaster w/expansion joints. Are there any specific requirements for joints, etc on the (N) Response The depth and alignment of existing electrical conductor/conduit shall be determined in field by the Contractor; work shall be coordinated with the TJPA Representative. #6 verticals referred to as a nelson product are deformed bar anchors. Yes, #6 verticals are welded to the existing embed plate. The welding requirement is full penetration. If the existing embed plate is not continuous and/or does not exist, the #6 verticals shall be drilled and epoxied 6" into existing concrete with Hilti RE500 or approved equal. Remove and relocate (E) chain link gate/fence as-required. The location of the gate shall be coordinated in field with the TJPA Representative. The extent of the new temporary construction fence is shown on Drawing C-2000. No, there is no sealant between the aluminum composite panel and the epoxy set stone panels. The requirements for the joints on the terminal side are shown on Detail E/A- 6000 for the vertical joints and Detail D/A-6000 for the top and bottom horizontal joints. Intermediate horizontal joints should not be provided. Note on Detail E/A-6000 the SASM waterproofing sheet behind, and the 2" overlap of the 16 Ga steel sheet. The overlap also includes a 3" width of sealing tape between the sheets. The metal sheet joints are then secured to the plywood backer behind with stainless steel self-tapping sheet metal screws at 8" on center. The October 15, 2010 TG0019.1 301 Mission Screen Wall - Bidder Q&A Response Set No. 2 Page 1 of 2
0011 wall. Does the (N) wall get painted? 10.15.2010 Plan view on sheet sht C-2000 calls for (4) new 9" x 12" concrete curbs. Detail B-C-5000 shows the curbs in section. Do these curbs get placed on top of the (E) pavers of do they go down on top of the 4" topping slab w/pavers around the (N) curb? Are there any rebar or epoxy anchorage requirements? rolled sheet is to be galvanized for weather resistance, but is not painted. New concrete curbs are to be placed on top of existing 4" topping slab. Remove and replace existing pavers as required to facilitate construction of new concrete curb. Height of curb shall be measured from top of pavers. For vertical reinforcement, use four #3 bars (equally spaced with a minimum of 4" cover at each end); for anchorage, drill four 1" embeds per curb. For longitudinal reinforcement, use two #3 bars with minimum 3" cover. October 15, 2010 TG0019.1 301 Mission Screen Wall - Bidder Q&A Response Set No. 2 Page 2 of 2