B08_Attach_4_2021_Preprop_Info_and_QAs.pdf

2021 Preproposal Information and Consolidated Q&As

Consolidated on 3/8/2022

Questions asked during 2021 Pre-Proposal Site Visit:

1. Is there a maximum Water Treatment Plant (WTP) downtime for switch over?

a. The new WTP should be commissioned and running to confirm proper operation prior to disconnecting and decommissioning the existing WTP. The shutoff downtime should be limited to one day for switch over to the new WTP. If the following work is completed prior to the plant switchover, the additional Lodgepole Reservoir storage and Wolverton Interconnect may allow for additional downtime if approved by the Contracting Officer and Park:

CLIN 3: New Wolverton to Lodgepole Reservoir Interconnect CLIN 8: Reconstruct Lodgepole Reservoir’s Overflow Pipe

System (Bid Option 2) CLIN 10 Replace Lodgepole Water Storage Reservoir Hatches

(Bid Option 4) CLIN 11 Replace Gate Valves at Lodgepole Reservoirs (Bid

Option 5)

Excessive water storage time should be avoided due to accumulation of disinfectant byproducts.

2. Is Clover Creek the main hub for operations?

a. Yes, but since the Lodgepole WTP is located in a valley, SCADA communications can’t be directly relayed. If CLIN 7: Radio Antenna (Bid Option 1) is included, the telemetry communications will be directed through the recently constructed lift station downstream from Lodgepole WTP.

3. Are employee housing or trailer pads available for Contractor use?

a. To be determined, it may be available upon request. An existing NPS workspace/office is available for the CMR and NPS DSC and therefore, an additional field office won’t be required for that purpose.

Additionally, there is no requirement for a large Contractor field office to hosts NPS meetings or conferences.

4. Can HDPE be used in lieu of DIP for the intake piping, specifically the encased portion?

a. This may be approved upon request. It would provide a lighter load for hauling and pipe strength would not be a concern within the encased section.

5. Is there camping available near the Silliman Creek Intake for Contractor use?

a. To be determined; camping may be permitted further along the Twin Lakes Trail. If approved by the Contracting Officer and Park, camping must be at least 25 feet from water (stream or ponds), and if the site is within 25 to 100 feet from water, camping is only allowed within previously established campsites. No camping is allowed within vegetation or in meadows.

6. What are the procedures for restrooms when working at the Silliman Creek Intake or Lodgepole Reservoir?

a. Human waste must be buried at least 6 inches deep and 100 feet from trails, camps, and all water sources. Pack out used toilet paper.

Additional Information Provided

7. Key personnel positions may be performed by individuals that fulfill multiple roles. For this project the Contractor's Quality Control Manager/Supervisor role and the Site Safety Manager role may be performed by individuals that perform other roles/duties.

8. The Project Manager is not required to be onsite during any particular periods. The Job-site Superintendent shall be onsite whenever any construction activity is underway by the prime contractor or subcontractors. The Quality Control Manager and Safety Manager shall be onsite whenever any significant construction activity is occurring.

9. Normal work hours are likely to be expanded during key periods of construction. Allowed construction work hours could potentially be revised to 6:00 AM to 7:00 PM including weekend days, upon request during the construction period.

10. Material for backfill of trenches and underground structures & foundations may include excavated onsite materials that have been crushed (a separate request for operating an onsite crusher must be submitted and approved) or that have been grizzly-screened to 4-inch minus. The onsite-processed materials shall not be placed within the pipe bedding zone nor within the base & surface paving zone of trenches and shall not be placed within 24 inches of any underground structures & foundations. The onsite-processed materials shall not replace any flow fill material or other select fill materials. The onsite-processed materials shall be placed with a mix of particle sizes and compacted such that there are no significant voids nor nesting similarly sized particles.

11. Third party commissioning of the water filtration system and the HVAC system is hereby waived. These systems shall be put through a thorough startup process, testing process, and commissioning process as required by the specifications, but these processes may be performed by qualified personnel from the supplier/subcontractor staff or by other qualified personnel.

Questions previously asked and answered:

Question Response

MBTechnology complies with section 07 51 00 (for Built-up Bituminous Roofing) and would like to be considered as an approved equal.

After contract award, the materials submittal process may be used by the contractor for proposed substitute/comparable/or equal products. See specification 01 67 00 - Product Requirements.

The title of plan sheet 37 (Sub Sheet A1.2) is: EXISTING WTP DEMO & FLOOR PLAN (BID OPTION 6). Please clarify Bid Option 6.

Bid Option 6 is Reroofing the Existing Lodgepole Plant Building as indicated on sub sheet A1.3.

Delete the Bid Option 6 reference in the title of sub sheet A1.2.

Specification Section 46 07 14 – Packaged Water Treatment Plant Covers references DURASHIELD® panels for a cover system but they are not referenced on the drawings. Please advise which drawings require DURASHIELD® panels.

The covers are to be provided by the manufacturer of the packaged water treatment equipment. Refer to Filter Unit 1 and Filter Unit 2 shown on sub sheets P-3 throughP-6.

Sheet I-2 in the legend box is calling out EMT or GRC conduit.

The specifications are saying "all exposed conduit is to PVC coated rigid steel" (26 05 33 M 6a). Please advise if the instrumentation conduits are to be PVC coated rigid steel or is EMT or GRC conduit acceptable to use inside the building.

An NPS DSC Technical Branch electrical engineer has confirmed that PVC coated rigid metallic steel conduit shall be installed in all exposed locations, for all applications.

If the instrumentation conduits are acceptable to be EMT or rigid, can all exposed conduits be EMT or rigid?

An NPS DSC Technical Branch electrical engineer has confirmed that PVC coated rigid metallic steel conduit shall be installed in all exposed locations, for all applications.

The specification for the vertical turbine pumps (filtered water pumps) are missing required information and have incorrect performance parameters identified. First, the specification identifies a pump model 7RALC, but then further listed conditions.

Specifications call for a max RPM of 1800 but to perform the intended requirements it must turn around 3600 RPM and is incapable of meeting the requirements at 1800 RPM. Second, there is no total pump length (TPL) identified. When building a short-coupled turbine pump, the TPL should be identified. Please provide clarification for the desired filtered water pumps.

The named (basis of design) pump manufacturer, Xylem/Goulds, recommends an 1800 rpm pump for the filtered water pumps. The performance criteria in the specification are based upon data from Xylem/Goulds: 1.VIT - Short Set Lineshaft Turbine Pumps Wet pit/Open Sump Lineshaft Turbine: Open Lineshaft, VIT-DITM 7RALC, 16 Stages 2. Bowl Assembly 7RALC, 16 Stage(s), Manufacturer's Standard 3. Column Assembly 4" x 1" Threaded W/L Column 4. Head Assembly 4" x 12.00" DI W/L Head, 150 # Flange 5. Motor US, VHS 7.50 Hp 1770 RPM H007B2A1EB-CVNU-100A0B000, Steady Bushing: No, Motor Coupling: NRR.

Operating Conditions: Specified Flow 45.00 USgpm, Specified TDH 297.00 ft, Rated Speed 1770 RP, Atmospheric Pressure 14.70 psi, TPL

9.50 ft, Pumping Level 5.00 ft, NPSHa at 1st Impeller 37.0 ft, NPSHa at Grade 33.9 ft.

Total Pump Length can be taken from the elevations on drawing P-8 Section F, it is 9.50 ft.

Section 1265 section E. of the specs and Note 4 on page 108 of the plans describe a NEMA4X panel with computer shelf, programming ports, lights and a number of other items. We are assuming you would like the NEMA 4X and other components listed outside of the spec are required, but thought we should confirm.

All components necessary for a fully functioning water treatment facility are required.

1. Regarding the controllers that will operate the sensors and analyzers: In the section Multi-Parameter Analyzers Systems

– Specified for Hach Model sc1000 Multi- Parameter Universal Controller, “or equal”

a. These controllers are designed for applications in which we want 4-6 instruments/sensors plugged into the same controller. If you want up to 2 sensors plugged into one controller, we can use an sc200 controller, which is close to 1/3 the price. That way if you don’t have 4 or more sensors in closes enough proximity to each other to use one sc1000 (and get your money’s worth), you may want to consider the sc200. The sc200 does not have Prognosys, however.

b. Also depending on when you expect this to be purchased, we have a new controller coming out that will take the place of the sc200 called the sc4500. It is scheduled for release close to the end of 2021. If the timing makes more sense, we may want to allow for using the sc4500 instead. Would you prefer to do that or stick to the sc1000s?

The primary reason for selecting the SC1000 over the SC200 was the remote monitoring capabilities that is provided by the Ethernet connection only available in the SC1000. The Ethernet will allow remote monitoring of the instruments condition and not just the measured values. The combination of Prognosys and the remote monitoring capabilities will allow the operator to react to problems before they become failures. It is our understanding this facility will not be staffed with an operator and the system was designed to allow an operator to monitor the process from a remote location. The system was to be designed to maximize remote monitoring capabilities to all a to allow the park staff to have more control over where they apply their resources.

The SC200 will cost approximately $2,000 apiece, there are 9 sensors they will require 5 controllers which $10,000 dollars the same cost as the two SC1000. The SC200 only support RS485 and Analog outputs. The RS485 networks are gradually be replaced with Ethernet throughout the industry, so we do not recommend using the serial network. The Analog 4-20mA will require installing an additional analog module in the PLC which depending on the PLC manufacture will cost about $1000. The electrical contractor will need to install 9 communication cables to the PLC instead of 1 cable and 3 additional power cables.

We do not see cost as to be the deciding factor in this selection.

c. Depending on which controller we end up choosing from the two questions above, we need some help determining the total quantity of controllers. In reading the attached Input Output List, the following transmitters (sensors/analyzers) are listed:

See Q&As below, per item.

i. AIT-12 – Raw Water pH – 24VDC This one and AIT-13 looks like they are going to be in the same area and can share a controller. We can add an additional output for temperature. If these two can share a controller, an sc200 (or sc4500 for future) would be sufficient. Please advise.

We do not see a cost advantage to the use of the SC200, additional cabling and PLC module reduce the cost difference to a negligible amount.

iii. AIT-33 – Filter 1 Raw Water Turbidity – 24VDC Does this need its own controller, or can it share with AIT-48. Please advise.

If the instruments are networked together as shown in the design, they will not require an additional controllers.

iv. AIT-48 – Filter #1 Filtered Water Turbidity – 120VAC Do we want 120VAC for this one transmitter, or is this a typo? Please advise.

That is a typo, it should match the other instruments.

v. AIT-53 – Filter #2 Raw Water Turbidity – 24VDC Does this need its own controller, or can it share with AIT-

68. Please advise.

If the instruments are networked together as shown in the design they will not require an additional controller.

vii. AIT-115 – Filter Water Turbidity – 24VDC Does this need its own controller, or can it share with AIT-116. Please advise.

If the instruments are networked together as shown in the design they will not require an additional controller.

ix. AIT-117 – Lodgepole Tank Chlorine Residual – 24VDC Does this need it’s own controller, or can it share with any of the others above? Please advise.

If the instruments are networked together as shown in the design they will not require an additional controller.

a. The specifications state that the probe module shall be equipped with Ethernet, Modbus TCP/IP or Ethernet IP and Prognosys. So based on the fact it appears each sensor/analyzer will require its own designated controller, do you want to offer an sc1000 Display and Probe Module for each? Or if the order isn’t being placed until 2022, take exception and offer an sc4500 with Ethernet/IP, Prognosys and 24VDC?

The Ethernet will allow for remote monitoring of the instruments see above response.

i. If Prognosys is desired, we would only be able to provide that with the sc1000 or the sc4500 coming out later. The instruments/sc200 has some diagnostic features, but not Prognosys.

This site will be unmanned and operated during the busy summer seasons. The Prognoys and the Ethernet remote monitoring equipment allow them the ability to perform pro-active maintenance and not just reactive to failures.

ii. The sc1000s come with a separate “probe module” (essentially the internal computer) and “display module” (the screen). The end user can share display modules between sc1000s by disconnecting from one probe module and moving it to another. This will save some money because you may not have to purchase one display module per probe module. However, if the controllers are far away from each other, this can be a nuisance to the operators as they will have to hunt around for the display module to do their work. Just something to consider… Please advise number of probe and display modules desired if the sc1000 is utilized.

All the probe modules will be networked together as shown in the design, only one display will be required.

a. If we are offering the sc1000, (4) or (6) sensor input? This would depend on the answers to section “c” and how many instruments we can put on each controller

The SC1000 Probes are available in 6 and 4 sensor modules. If you purchase two SC1000 with 6 inputs you will have 3 spares for future device. If you purchase all SC200 you will only have one spare. To us SC100 makes sense, support for 12 instruments for $10,000 or five SC200 which will provide support for 9 instruments for $2,000 a piece for a total of $10,000.

b. The specification also states the following: Shall provide support for an RTD measuring element or 4-20mA signal. This input shall support the Raw Water Temperature element of the transmitter.

How do we handle this? The way I am understanding this is that they want another analog output for the Temp that is also measured on the pH probe. Are we interpreting this correctly?

The initial design had a separate temperature probe would connect to an auxiliary input on the SC1000 controller. But after examining the cost and the availability of auxiliary analog I/O in the PLC, this temperature transmitter was moved into the PLC, TIT-1 RAW Water Temperature.

2. pH/ORP Analyzers – Quantity appears to be (1) pH – Specified for Hach Digital pH Sensor, DPD2P1, or “approved equal”

a. Part number DPD2P1 is an insertion type sensor, so I will offer the compatible insertion ball valve mounting kit. CPVC or Stainless-Steel?

According to the engineer at Mott Macdonald the material should be stainless-steel.

3. Chlorine Analyzers – Quantity appears to be (2) – Specified for Hach CL17sc Colorimetric Chlorine Analyzer, or “approved equal”

a. Pressure listed is 75 psi, so should I offer the standpipe or pressure regulator installation kit?. It mentions “if the standpipe is used” on page 3 section B2 of the chlorine analyzers document, so should we quote that?

The instrument will be wall mounted 3.1 A. 1. If the instrument is wall mounted as shown in the drawings, then a standpipe installation kit will not be required. Provide a pressure regulator installation kit as required by Hach instruction manual page 3 procedure number 6 of Step 2.

See Figure 4 for pressure regulator installation.

4. Turbidity Analyzers – Quantity appears to

(6) – Specified for Hach TU5300sc Low Range Laser Turbidimeter, or “approved equal”

a. The specifications call out for System Check, RFID, Flow Senor, and an ACM (automatic cleaning module) on the Raw Water Turbidimeters only. So do you want me to offer the fully loaded TU5300 for the Raw Water Turbs and a TU5300 with System Check, RFID and a Flow Sensor for the other ones? Or keep it consistent for all turbidimeters? My preference would be to keep it consistent and include the ACM for all turbs. The ACM is only an additional $59 when purchased with the instrument (and $800 if needed afterwards). What do you prefer for this?

This decision is up to the operators of the facility.

For bid purposes, be consistent and provide ACM for all turbidimeters.

5. Also, could you please confirm that communication protocol that is required, if Modbus TCP/IP or Ethernet IP is required, the sc200 controller cannot be utilized. We would have to offer the sc1000 for Modbus TCP/IP or the sc4500 for Ethernet IP.

We believe the SC4500 alternative to the SC1000 than the SC200. If this was a staffed facility for a municipal water plant with dedicated instrumentation technicians onsite than the remote monitoring capabilities may not be necessary. This is not that, remote facility in a remote location, with all the associated staffing issues.