Q&A_10-17-18.pdf

WA RIDGE MAIN (1)

MAIN AVENUE ACCESS IMPROVEMENT

# General Technical Question Answer Date 1 X Are you requiring DR18 or DR14 C900 PVC pipe for the sewer FM?

Per CRWWD requirements, Polyvinyl chloride (PVC) pipe AWWA C900 or AWWA

C905, SDR 18

10/1/18

2 X Are you requiring restrained pipe joints on any of the C900 PVC sewer FM?

Per CRWWD requirements, Thrust forces in pressurized pipelines shall be restrained or anchored to prevent excessive movement and joint separation under all projected conditions. Thrust restraint shall be mechanically restrained joints.

10/1/18

3 X The plans call for (4) 4” ductile iron MJ 45 bends, are you requiring all the fittings on the sewer force main to be ductile iron or just those (4)?

Please clarify. The (4) each 4‐inch MJ 45 Bends shown on sheet H.1 are part of the Sanitary Sewer. Sanitary Sewer pipe and fitting are PVC according to Subsection 708.05.

10/1/18

4 X Clean‐out detail on sheet H‐8 calls for a (threaded plug 12” with 2” square nut)‐ are you requiring the clean‐out to be 12” diameter on a 4” sewer main?

This will be addressed in a forthcoming Amendment.

10/1/18

5 X Are you requiring restrained pipe joints on any of the 8” CL52 water main? Note 3 on sheet I.2 references a detail which shows minimum pipe joint restrained lengths near fittings, but it isn’t included in the plans or spec.

Yes, the contract does require joint restraint per City of Ridgefield Standards.

10/1/18

6 X Item numbers 62501‐0000 Line A1040 and 62501‐0000 Line A1060 refer to wetland and upland turf establishment. What are the seed type requirements for both of these line items?

Material requirements for Section 625 Turf Establishment are specified in Subsection 625.02.

10/1/2018

Check General or Technical

7 X Section 625.08 Mulching under 625. – Turf Establishment lists applying wood fiber or grass straw cellulose fiber mulch (at rate of 1500 lbs per acre), as well as applying bonded fiber matrix hydraulic mulch (at rate of 3000 lbs per acre). Is it up to the contractor to decide which type of mulch they use between these two options?

Yes, the bidder can elect to use either option

10/4/2018

8 X Clarification to my question A3 ‐ MJ fittings are typically made from Ductile Iron and restrained with Mega Lug retainer glands. You can’t get an MJ PVC fitting. So, my question was inquiring if you would accept MJ AWWA C153 Ductile iron fittings with Mega Lug restraints on all the fittings?

Comply with the CRWWD Manual as called for in the SCR’s.

10/4/2018

9 X Can the asphalt in the roadway be left onsite as fill?

Yes. Construct embankments according to Section 204. Dispose of unsuitable or excess material according to Subsection 204.14.

10/5/2018

10 X Will Line Item A1540 Mitigation, Streambed Materials be imported or salvaged from onsite materials?

See Subsection 703.18. 10/5/2018

11 X What work does Line Item A1560 – Mitigation, Wetlands Mitigation refer to?

See Subsection 101.02. The first three digits of a pay item number in the bid schedule identify the Section under which the work is performed. Pay item number 64706-1000 indicates work specified under Section 647.

10/5/2018

12 X Is there any maintenance or a maintenance period required for the plantings?

No. This will be addressed in a forthcoming Amendment.

10/5/2018

13 X 107.10(e)(6) – Does the archaeologist need to remain onsite for the duration all excavation and bank shaping listed in the specification?

Yes. As described in the SCR, “Excavation of the Gee Creek Culvert at station 65+11 as well as bank excavation and bank shaping of Gee Creek east of Main Avenue requires archaeological monitoring .” This is exclusive (only Gee Creek, only east of Main Avenue). There is no requirement for archeologist monitoring anywhere else on the project site.

10/10/2018

14 X 157.10 – Please confirm the diversion can only be a lined diversion ditch or bypass culvert. The specifications seem to not allow a pumped bypass.

Pump bypass is allowed. 10/10/2018

15 X 552.11(b)(6) – Notes ‘precast concrete manufacturing plant certified by the Precast/Prestressed Concrete Institute Plant Certification Program with a “B‐4 Prestressed Deflected‐Strand Bridge Beams (Superstructure)” certification’ is to be used.

What elements of the project are required to be cast by a precast plant carrying this certification?

Any precast elements of the Gee Creek structure require this certification.

10/10/2018

16 X 602.03(b)(5) – Notes the precast manufacturer is supposed to ‘submit at least two independently verified full scale load tests that confirm the design methodology of the proposed three sided arch structure.’ This is seen as an unrealistic expectation which precast manufacturers would not perform. Please remove this requirement.

This will be addressed in a forthcoming

10/10/2018

17 X 602.03(e) – Are concrete footing and stem walls required to be cast‐in‐place? The specifications and plan set contradict each other. Plan sheet G.18 leaves the design of the footings and stem walls up to the manufacturer of the precast concrete culvert.

Footing, stem walls and wing can either be CIP or Precast. This is a contractor choice.

10/10/2018

18 X Drawing K.1 – Please clarify which bid item the contractor should utilize to capture costs involved with the excavation for the mitigation area, stated at 2,550 CUYD.

It is up to the bidder to determine how to structure their bid. The wetland mitigation excavation work is specified in Section 647.

The Section 647 pay items are full compensation for the work specified in that Section. See Subsection 109.05.

10/10/2018

19 X Please explain all the utility work that is currently being done along main avenue. I have been to the site 3 times now and have constructability concerns regarding the dewatering and shoring that will be required to install the proposed culvert. I see they are horizontally drilling utility approximately 4’ under the proposed subgrade for the new arch culvert. This will eliminate any possibility to use sheet pile for dewatering and or shoring for excavation at this location. Please provide plan locations of all new utility’s that will be installed between now and the proposed contract start date.

This will be addressed in a forthcoming Amendment.

10/10/2018

20 X Are we to include “use tax” in our proposal or will FHWA be paying retail sales tax to the State of Washington?

FHWA will not be paying sales taxes to the State of Washington. Include the cost of taxes in your bids. Compensation provided by the pay items is full payment for all costs. See Subsection 109.05.

10/10/2018

21 X I am having trouble opening the documents that have the “tin” extension can you change this to a PDF and repost.

No. The .tin files are only useable in their native format.

10/10/2018

22 X Sheet J.1 lists items other than conduit. For example transformer pads, pedestals, vaults and hand holds. They are listed “For information only” are these items the contractor’s responsibility to install?

Yes. See Plan Sheets J.2 through J.11, and Section 636. All of the work in the contract is the responsibility of the contractor unless it is assigned to others. See Subsection 101.01.

10/11/2018

23 X Regarding precast plant certification specified under Subsection 552.11(b)(6), there seems to be some confusion from precast concrete suppliers. Precast suppliers are under the impression the Precaster certification requirement for Gee Creek structure is outlined in 602.03. Please clarify.

This will be addressed in a forthcoming Amendment.

10/11/2018

24 X Looking for the gradation requirement for item 30202‐2000 Roadway Aggregate, Method 2 in the project specifications, plans, and FP‐14 but haven’t found it yet. Specifications Table 703‐2 for Aggregates lists Subbase and Base and Plan Sheet E‐1 with typical sections calls our Roadway Aggregate, Method 2. Question: Is there additional information in the Specifications, Plans, or FP‐14 that I’ve missed that will clarify this?

Yes. See Subsection 101.02. The first three digits of the pay item number in the bid schedule identify the Section under which the work is performed. See Subsection

302.02 in the FP‐14. Material requirements for Roadway Aggregate are specified in 703.06.

10/11/2018

25 X E‐43, 156.07 (K) states that the GC is to furnish Pilot Car, or flaggers, or both. A pilot car seems like a very efficient method for one‐lane traffic.

However there is no bid item for pilot car. Is the Pilot Car to be considered Incidental to the Traffic Control Bid Item 1300?

This will be addressed in a forthcoming

10/12/2018

26 X Can flow rate information for Gee Creek be provided for designing the temporary diversion?

See hydraulics report posted as physical data.

10/12/2018

27 X E‐48 Diversion installation, calls for Cofferdams to isolate construction area. Page 10 of the Geotech Report, 3.3.2 states the need to dewater down 20’ for the installation of the Spread footings for the arch culvert. This seems to require the installation of a cofferdam structure. However Sheet G.5 and other corresponding sheets only show Temporary diversion berms on each end of the Arch Culvert to facilitate dewatering. If cofferdams are necessary is there any information as to placement or design? Are the cofferdams to be incidental to the Arch Culvert Item 640?

All work specified in Section 157 is paid for under the Section 157 pay items. We are preparing an Amendment to Section 157 to clarify the diversion work.

10/12/2018

28 X The Road Closure from 7/5/19 to 10/3/19 seems extremely short for the amount of work that needs to be completed in the closure. It also conflicts with In‐Water Work window stated on E‐16 107.10 as 6/15/2019 to 11/1/2019, which will require road closure to install a by‐pass culvert per E‐48 Diversion Installation. Is there information available for how the FHA determined the length of the road closure? And how the arch culvert and associated roadway fill, storm and sanitary utilities, and surface paving can be completed in less than 90 days?

We are preparing an Amendment to Section 157 to clarify the diversion work.

10/12/2018

29 X Item 64703‐3010 – Mitigation Rock Weir has a unit of measure of each. It is very difficult to evaluate the volume of rock required to make the weirs shown. Can this unit be changed to a weight measurement like riprap?

We prefer to keep the unit of measure per each.

10/17/2018

30 X Is there any material haul off required besides what’s located at and around the bamboo?

Yes. See Subsections 201.06 and 203.05. 10/17/2018