QA3.pdf

Bidders Questions & Answers

CA FTNP GOGA PRES 1(15)

8/10/16

Q: Can Fusible C-900® pipe be used as an ‘or equal’ for the specified Certa-Lok C900/RJ system within the Baker-Barry Tunnel, Bid Items 61102-3450 and 61202-0700?

A: See Amendment 0002 for Fusible PVC pipe requirements.

8/11/16

Special Contract Requirements Section 725.30- Can DR 18 TerraBrute® CR pipe be used as an ‘or equal’ product because it provides similar or greater axial restraint capacities as the specified Certa-Lok C900/RJ PVC?

A: The proposed DR 18 TerraBrute® CR pipe does not appear to meet the requirements of Subsection 725.30 for Class 305 (DR 14) polyvinyl chloride pipe.

8/15/16

Q: Is the prebid for the Golden Gate NRA Tunnel preservation (8/16) mandatory?

A: This is not a mandatory visit.

8/18/16

Q: Can the Contractor Work Performance requirement be reduced (Page C-14) from 50%?

A: An amendment will be issued reducing the percentage.

8/18/16

Q: Can the pre-bid meeting sign-in list be distributed to the attendees of the meeting?

A: The sign-in list was posted on 8/18/16.

Q: Item 27301-0000 Polyurethane Resin Injection (Crack Sealing) has a unit of measurement which is by the pound (LB). Typically we see this item bid as linear feet (LF) of crack to repair and then a separate line item for the furnish and installation of the Polyurethane Resin by the gallon or pound. This would greatly assist in quantifying the expected amount of crack sealing to be done in the tunnel and create bid items that are more measurable in the field to avoid discrepancies and dispute.

A: Please refer to Subsection 273.06 Injection Operations which states: “At least 14 days prior to beginning the work of this Section, submit a tabulation of actively leaking joints and cracks, and the corresponding lengths, in the tunnel liner which are proposed to be sealed. After review by the CO, agree upon which joints and/or cracks will be sealed. Submit a revised tabulation with the location and length of cracks and joints to be sealed.”

Approximately 3,000 linear feet cracks were estimated to be require sealing, which resulted in the 8,550 lb PUR estimate. The contractor may determine that this quantity needs to be adjusted upon site verification and measurement of cracking requiring sealing.

Q: The cracks that likely need sealing observed during the site visit of the tunnel had significant spalls in the concrete surface that followed the crack. Is patching the surface of these cracks considered incidental to Item 27301-0000 Polyurethane Resin Injection (Crack Sealing)? What material is to be used to patch these spalled cracks?

A: Minor spalling repairs using the PUR product will be measured under item 27301- 0000 Polyurethane Resin Injection (Crack Sealing). See Amendment 0002.

Q: Item 55212-0000 Clean Concrete Surface includes pressure washing the interior tunnel surfaces and properly disposing of the resultant waste water. Is this water allowed to be discharged into the sanitary sewer?

A: No. As per Subsection 552.18 “legally dispose of wash water outside the Park”.

Q: Item 55212-0000 Clean Concrete Surface includes pressure washing the interior tunnel surfaces that are in varying states of deterioration. When spalls occur during this process in areas not slated for repair is the contractor responsible for repairs?

A: As per Subsection 552.18 the tunnel liner is not to be damaged when power washing.

Q: Item 27001-0000 Grout (Polyurethane Void Filling) does not indicate the total number or the typical spacing of grout holes to be drilled and patched for the void grouting just a note that the locations will be as directed by the CO. Definition of the typical hole spacing along the perimeter of the concrete tunnel liner section and the longitudinal spacing will allow the contractor to appropriately price this activity.

Typically we see the grout holes as a bid item (per each) and the furnish/installation of the grout as a separate bid item (per gallon or pound).

A: For the drill holes, as per FP-03 Subsection 109.05 “Work for which direct payment is not provided is a subsidiary obligation of the contractor. Payment for such work is indirectly included under other pay items shown in the bid schedule.”

As per Subsection 270.03(f) the contractor is to provide the approximate intervals of holes to be drilled in the Injection Plan. The effectiveness of the plan is determined through verification of complete void coverage behind the liner between all injection holes.

Q: Item 61102-3450 10” Waterline, PVC – is this restrained joint pipe?

A: See Subsection 725.30 for PVC pipe material requirements.

Q: Item 61202-0700 8” Sewer Line, Plastic – is this restrained joint pipe?

A: See Subsection 725.30 for PVC pipe material requirements.

8/23/16

The only specifications that we have found, for the generator and ATS are minimal notes on Drawings U-45 and U-48. Generator Questions:

Q: Is there any other specification for this equipment?

A: No, as per plan sheet U-45 the generator is to be a new 20 KW 480V, 3=phase Generator with 132 gallon skid mounted tank and weatherproof enclosure.

Q: Is there any specification for the starting-stopping of the generator and coordination with the ATS?

A: No

Q: Are any telemetry/alarms regarding the status of the generator and the ATS required?

A: No telemetry or alarm is required.

Q: If yes to Question 13, please provide specification.

A: See answer to Question 13.

8/25/16

Q: Bid Item 27301-0000 Polyurethane Resin Injection (Crack Sealing) – 8550 LB. No information is given regarding the quantity of cracks to be sealed . Will this be provided?

Without this information it will be difficult to accurately price this bid item which in turn will lead to higher units prices due to the uncertainties.

A: See answer to Question 4.

Bid Schedule A, Item 60902—0600, Curb and Gutter, Concrete, 8-Inch Depth Drawing B1, last row is Item 60902—0600, Curb and Gutter, Concrete, 8-Inch Depth Drawing B5, 10th column is labeled 60902—1100, Curb and Gutter, Concrete, 13-Inch Depth Drawing D1, calls out “Remove and Replace Curb and Gutter, concrete, 13-Inch Depth (Note, Bold added for emphasis). Questions:

Q: Is the 8” Curb and Gutter the same as the 13” Curb and Gutter?

A: The correct pay item is 60902-1100, Curb and Gutter, Concrete, 13-Inch Depth. The Bid Form and Sheet B1 will be updated in Amendment 0002.

Q: Is all the new curb and gutter on the project shown on Drawing D1?

A: Yes.

Drawings U11 & U17, Bubbles A, B, C, D, E, F, R, T appear to have incorrect drawing references.

Drawing U11 & U17, Air Release Valve Assembly appears to have incorrect drawing reference.

Questions:

Q: Provide correct drawing references for all the Bubbles

A: Bubbles A, B, and C should reference Sheet U16. Bubbles D, E, F, R, and T should reference Sheet U12. The sheet number references will be corrected on Plan Sheets U11 and U17 in Amendment 0002.

Q: Provide correct drawing references for air release valve details

A: The air release valve callout should reference Sheet U13. The sheet number references will be corrected on Plan Sheets U11 and U17 in Amendment 0002.

8/26/16

Q: I have a question regarding the expansion anchors for the pipe supports, we can’t determine if they are to be hot dip galvanized (HDG), Zinc Coated or Stainless Steel.

Since the Pipe Supports are supposed to be HDG should we figured the expansion bolts to be HDG?

A: Yes, the expansion bolts should be hot dipped galvanized.