Amendment_8_Questions_and_Answers_9-8-22_08.docx

GRCA 190083

Replace Transcanyon Waterline and Improve Potable Water Systems Grand Canyon National Park

Solicitation 140P2022R0100 – Questions and Answers

Amendment 1, issued 7/22/22:

1. Question: Can you post the as‐built drawings for the existing transcanyon pipeline and pumping stations at roaring springs and Indian Gardens?

Answer: No set of comprehensive as-builts exist. The solicitation documents are the most current basis of existing system information available.

2. Question: Is AIR-SHIELD LMP an acceptable approved equal material?

Answer: The prime contractor will make all material submittals to the NPS for approval after award. Any substitution requests should be submitted to the eventual awardee of this contract.

3. Question: Do you have a list of contractors who are looking at this project?

Answer: The Presolicitation Attendees list was issued with a Special Notice on sam.gov under this solicitation number on June 21, 2022.

Amendment 2, issued 7/29/22:

4. Question: The Special Notice posted on May 26 gave on information on a Virtual Pre-Proposal Conference to be held on June 17, and an escorted Site Visit to occur on June 21 - 24. Will there be a second escorted Site Visit before proposals are due?

Answer: Site visits for areas not open to the public will be considered by appointments on an as-requested basis. Please email your requests to timothy_burger@nps.gov and edwin_berry@contractor.nps.gov and identify the specific area of the project you would like to see. Areas closed to the public include: South Rim Heliport, Havasupai/Indian Gardens Pump Station, Cottonwood and Manzanita NPS Buildings; There is limited access around Phantom Ranch WWTP because of active construction.

5. Question: Even though a single comprehensive as-built set does not exist, there are a few relevant as-built drawing sets. Can you post those for reference? #1 Transcanyon Water Line # 3608, #2 Transcanyon Water Transmission System Improvements- Phase 1 # 113-41126 A, #3 Transcanyon Water Transmission System Improvements- Phase 2 # 113-41127, #4 New Roaring Springs Pumphouse 1977 ( no drawing number known).

Answer: No as-builts will be provided during the solicitation phase of this project.

6. Question: Solicitation for this project requires the Project Schedule submitted in our proposal to be in MS Project Gantt Chart format. See Solicitation page 50 of 56 Factor 4. Our company uses P6 as our scheduling software. Can a P6 Gantt Chart format be used in our submission in lieu of the MS Project format?

Answer: MS Project or Equal - P6 is acceptable software.

7. Contracting Officer’s Note: Expanded drone footage of the project can be accessed following the link and Password provided below:

https://player.vimeo.com/video/730467912 Password: HDRNPS

Amendment 3, issued 8/5/22:

8. Question: Dwg 01-C400, Keynote 12 indicates the use of a new 10” Finish Water (FW) pipe. Dwg 01-Y107 from the P&ID indicates the use of an 8” FW pipe connected to existing finished water tank at South Rim Tank Farm. Please advise correct size FW piping.

Answer: The correct size is 8” FW.

9. Question: Dwg 01-C101, Keynote 12 New Fire Hydrant. No Bollards are indicated to protect Fire Hydrants. Please advise if Bollards required to protect Fire Hydrants.

Answer: The bollards are located in pull-off areas from the main access drive. No bollards are required.

10. Question: Dwg 01-S102, Keynote 6 indicates FRP Grating. Drawing does not arrow keynote 6. Please advise which grating is FRP.

Answer: Keynote 11 also indicates the area of FRP grating. Note that FRP grating is intended to be used in the chemical storage areas including the Coagulant Room, Sodium Hypochlorite Room, Caustic Soda Room, and Chemical Drum Room as referenced on the drawings. Please reference Sheet 01-A101 for room locations and structural sheets for grating details. Other grating material types are also indicated in the Drawings.

11. Question: Dwg 01-S103, Keynote 3 indicates w14x90 Steel Col. Please advise base plate and connection detail.

Answer: Column base plate schedule and associated connection details are provided in Standard Detail 5/00-S506 (Volume 0).

12. Question: Dwg 01-S105, HSS 12X12X1/2 Col. Is indicated. Please advise base plate and connection detail.

Answer: Column base plate schedule and associated connection details are provided in Standard Detail 5/00-S506 (Volume 0).

13. Question: Dwg 01-D302, Keynote 4 indicates wall bracket pipe support. Dwg 01-D302, Keynote 6 indicates galvanized wall bracket FRP Tray Support. Please advise quantity of supports for note 4 and note 6.

Answer: Spacing requirements for wall bracket pipe supports are defined in Detail 8, Sheet 00-D501 (Volume 0). In addition, the Contractor is responsible to design a support system in accordance with the requirements of Specification Section 40 -05 07 Pipe Support Systems. Note that not all pipe supports necessary to meet the requirements identified in the standard details and specifications are shown on the Drawings.

14. Question: Dwg 04-A505, Wall Cowls. Please advise, should there be closure plates welded on the two sides of cowl (act as stiffeners).

Answer: The cowl is to be backed by an HSS steel frame per structural detail 5/04-S503.

15. Question: Drawing 01-S102, 01-S103, 01-S104 and 01-S105, General Notes 2 reads Lower Finished Floor EL 7074. Drawing 01-S301, 01-S302, and 01-S303 indicate LOWER LEVEL EL 7047. Please advise correct Lower-Level Floor Elevation.

Answer: The correct elevation for the Lower Level is 7047.00.

16. Question: Drawing 04-A505; 2/04-A505 WINDOW HEAD DETAIL HSS TUBE FRAME AND CORTEN STEEL; COWL WELDED TO FRAME. Please advise as to whether the support HSS/Angel Frame at back side also needs to be Corten steel. Please advise the sizes and thickness for the HSS and Angle.

Please advise the specifications for HSS and Angle.

Answer: Material may be A500 and A36 steel for HSS and angles, respectively. See Specification Section 05 50 00 for material grade requirements. Connection angle to be designed and provided by steel stud manufacturer per Detail 5/04-S503, or other delegated designer at contractor’s option. HSS size is specified on Detail 5/04-S503.

17. Question: Is there a schedule or list(s) of valves required for this project? Or are the valves only identified within the mechanical drawings?

Answer: A Valve Schedule for process valves is provided at the end of Specification Section 40 05 51 Valves – Basic Requirements. Note which valves are included in the schedule as described on Page 7, Lines 23-29.

18. Question: On the last page the Support facility was awarded under a separate package GRCA 250176? Can you please let me know who was awarded this contract and for how much?

Answer: The first GRCA 250176 Support Facility solicitation was cancelled and then combined with this current solicitation 140P2022R0100.

19. Question: I wanted to confirm that we can use key subcontractors' project experience for one or more of the 3 relevant projects that we can submit in relation to the project experience/past performance sections? Assuming that there is a teaming agreement in place, is it acceptable to use their experience? The RFP language seems to suggest this but I wanted to clarify.

Answer: This is allowable if the Prime can demonstrate that they have worked together with the subcontractors on past projects.

20. Question: The answer for Question 4 on Amendment 2 states, “Site Visits for areas not open to the public will be considered by appointments on an as-requested basis”. Can we be provided with sign-in sheets for the additional site visits requested on an as-requested basis?

Answer: Email timothy_burger@nps.gov and edwin_berry@contractor.nps.gov with proposed dates and locations you would like to visit and we will work with the Park on what they can accommodate within those dates

21. Question: Based on the unique and complex nature of this project, would the National Park Service consider extending the time frames for relevant completed projects from 5 to 7 years? Likewise, can contractors include up to 5 projects to better illustrate their experience with the 'unique construction elements' designated in the solicitation? (i.e. potable water systems, high voltage power systems, helicopter operations) Answer: Contractors may provide relevant completed projects within the past 7 years. Contractors may include up to 5 projects to better illustrate their experience with unique construction elements.

22. Question: Specification Section 8 46 00 FIRE DETECTION AND ALARM; 1.1 SUMMARY; Last sentence of paragraph “The phantom Ranch WTP will not be provided with a fire alarm system”. Drawing 04-F001, CODE DATA TABLE; 2.7 FIRE PROTECTION SYSTEMS; FIRE ALARM AND DETECTION – NOT REQUIRED. Drawing 04-E107, Keynote 9; THE FIRE ALARM SYSTEM IS A DELEGATED DESIGN WITH PERFORMANCE SPECIFICATIONS. A FIRE ALARM AND DETECTION SYSTEM IS BEING PROVIDED TO SERVE THE WATER TREATMENT FACILITY.…THE INSTALLATION WITH OTHER TRADES. Please advise if Fire alarm system required at Phantom Ranch.

Answer: Keynote 9 on Sheet 04-E107 should be omitted. There is no fire alarm system at the Phantom Ranch WTP.

23. Contracting Officer’s Note: the following revised drawings, 03-C131 REV1 2022-08-22, 03-C137 REV1 2022-08-02, 03-C405 REV1 2022-08-02, 03-E503 REV1 2022-08-02, 03-E504 REV1 2022-08-02 are included in this Amendment.

Amendment 4, issued 8/12/22:

24. Question: In regards to the Helicopter LZ's (Landing Zones) can the National Park Service (NPS) clarify if there is an existing map available with all designated Landing zones? Spec section 01 65 50 states using existing LZ’s yet we only found 3 identified on the Contract drawings. Is it possible to land or drop supplies in any areas outside of the designated LZs and what will it take to create a project specific LZ

Answer: Landing zones (LZ's) shown in drawings are the only approved LZ's for the project. Contractor may submit a case by case request to utilize other park administrative LZ's given compelling case/need and park will review for impact to resources, operations, visitor experience and safety in consideration for limited use.

25. Question: How can I obtain a plan holders list for this project?

Answer: Government solicitations are officially issued on sam.gov. There is not a “Plan Holder’s List” on this site. The attendees list for the virtual pre-proposal meeting was posted to the Special Notice prior to the solicitation under number 140P2022R0100. Plan Holders Lists may be available through third party redistributers of the solicitation documents.

26. Question: Can you please provide spec section for new metal fabricated engineered building.

Answer: No pre-fabricated building specified in the solicitation documents

27. Question: Can the building be constructed with pre-engineered metal building design that would use rigid frame with purlins and girts? Spandrel to accommodate block walls and girts to accommodate cortin sheeting?

Answer: No, provide per solicitation documents

28. Question: Can you please send me the dimensioned drawings of the basins?

Answer: The basin dimensions are on the Drawings as follows: Basin Width (East-West Direction): 13’-11 ½” (each basin interior), See dimensioning on 01-S103. Basin Length (North-South Direction): 73’-6” (interior), See dimensioning on 01-S103 and 01-S104.

29. Question: It’s our understanding that on previous NPS Projects. NPS has chosen to hold back retention each Month from Billings earned which is inconsistent to FAR’s and previous Federal Contracts nor is mentioned in the specifications. Please identify if NPS intends to hold retention and how much if so?

Answer: The National Park Service contracting procedures adhere to the Federal Acquisition Regulations and the Department of Interior Acquisition Regulation.

30. Question: The State of Arizona has a Gross Receipts Tax. Does NPS and the Federal Government qualify for an Exemption and have the ability to provide the required certificates?

Answer: This is not a Tax Exempt project. All applicable taxes should be included in the offerors proposal.

31. Question: Past Performance Requirements for GRCA 190083 - Replace Transcanyon Waterline and Improve Potable Water Systems, Grand Canyon National Park. In regards to the above proposal, I wanted to confirm that CPARS evaluations are equivalent to the PPIRS evaluation reports mentioned in the Factor 6 - Past Performance section of the RFP? (Pg. 52/56) Are previously submitted (non PPIRS/CPARS) Past Performance Questionnaires (PPQs) also acceptable? If not, can you clarify whether a past project reference should forward the provided Past Performance Questionnaire directly back to the National Park Service or to us (the bidder)? If the form is required to be returned directly to the National Park Service, can you clarify who best to receive this information?

Answer: Per the instructions on the Questionnaire, "Offeror to complete Sections A and B and transmit questionnaire to reference. Reference to complete Sections C and D and transmit back to Contracting Officer listed in section E."

32. Contracting Officer’s Note: The drawings for the Contractor Support Facility, attachment “Att12b_CSF_Drawings.pdf” are replaced by revised attachment “Amendment 4_Att12b_CSF_Drawings_Rev 8-12-22”. The drawings issued with the original solicitation on 7/15/22 stated that the tree removal was not in contract. This is incorrect and the tree removal is now included in this contract, as noted on drawing pages 06-X100, 06-X101 and 06-X102.

Amendment 5, issued 8/19/20:

33. Question: Please consider this an official request to postpone the Bid Date for the GCRA 190083 Trans-Canyon Waterline Replacement Project by a minimum of 3 weeks.

Answer: The proposal due date is extended to September 12, 2022, at 1500 MT. Questions are due September 5, 2022, at 1500 MT.

34. Question: In the specifications Section 46 43 76 – 2.2 B. Materials, it does not define the material thickness of the items in the plate settler system. What is the minimum thickness of the Plates, Frames, Effluent troughs, weirs, support beams and beam brackets?

Answer: It is the supplier’s responsibility to determine the material thickness for the plate settler system components. Structural design requirements for the system are identified in Paragraph 2.4- Fabrication.

35. Question: During scheduled and allowed outages of the water system. How long does it take to replenish the Raw Water Tanks to Capacity after a allowable Winter and Summer Water Outage?

Answer: Recharge time for the South Rim Tank Farm is defined in Specification Section 01 73 40, Part 3.2.A.1.b.

36. Question: Currently the plans show vertical rock structures with piping & electrical ran on them. Civil Profiles for the Waterline show 1’ & 2’ of cover. Is the contractor supposed to Channel out the Rock and cover it after placement of the Mechanical & Electrical Systems?

Answer: The section of the TCWL replacement at the cliff face of Plateau Point (03-C131 STA 80+11 to 80+81) will have the pipeline installed along the outside of the cliff face using rock wall anchors as shown in Details 4/03-C501 and 2/03-S504, the limits of which are identified on the profile stationing. Electrical cables in that section will also be mounted to the cliff face as shown in detail 3/03-S504. The fiber optic rigid conduit will similarly be attached to the cliff face in this area as shown in detail 1/03-S506. Other sections of the TCWL replacement pipeline and new 3-phase power are at 1’ or 2’ of cover as shown in the profile stationing on the civil drawings.

37. Question: There is a call out on a drawing stating fiberglass walls between the floc stages. Is it possible to provide these in fiberglass or stainless steel? Also - who is planned/expected to provide these? They are not identified in the floc, plate or sludge removal specs so it is unclear who is supposed to provide these.

Answer: The baffle walls and associated components have been designed assuming the material is FRP. The Contractor may propose stainless steel as an alternative in their proposal along with the associated cost impact, however the basis of the Contractor’s bid pricing should be FRP. The list of Allowable Manufacturers in Specification Section 06 82 00 should be used for the FRP baffle wall supplier. Additional design criteria for the FRP baffle walls will be provided in an updated version of Section 06 82 00 in a future amendment.

38. Question: I am confirming that the Factor 2 – Technical Proposal written narrative is limited 5 pages maximum for all ten topics that you are requesting a response for and not 5 pages maximum for each topic. A 5-page limit for the whole approach does not give much opportunity to describe our means and methods with any detail.

Answer: The written narrative page limit for Factor 2 - Technical Approach is revised from a total of five (5) pages to a total of eight (8) pages.

Amendment 6, issued 8/26/22:

39. Question: As per the environmental specs in Section 01 35 05 (Volume 1/Division 1), tree removal on the South Rim will be prohibited during winter months (November - February) to protect tree-roosting bat species. Likewise, the Park has also stated that tree removal during bird breeding season will be limited from March to August. This leaves only September and October as months where tree removal can reliably be performed. Given that over 300 trees are required to be removed on the South Rim (in support of the new South Rim Contractor Facilities) we are concerned with the schedule timeframe. The project is likely to start in fourth quarter 2022 - which will place us directly within the prohibited tree removal time frame. Tree Removal will be a critical requirement to finishing the contractor facilities. Further, these facilities are needed to help support all phases that follow. Currently the specifications anticipate a September Award and a January Notice to Proceed (NTP). Will the National Park Service consider an early or limited NTP for the Tree removal and also mobilization/ set-up of our triple wide office Trailer?

Answer: Specification 024100 DEMOLITION: 1.1.B.3.b. Selective removal of trees to the north and west of Helibase as shown on Project Plans. The contractor is advised that the recommended season for tree removal is August 15 to April 1. The contractor shall submit requests to the Contracting Officer for any proposed tree removal activities between April 2 and August 14. Specification 311000 SITE CLEARING 1.1.B.2 The contractor is advised that the recommended season for tree removal is August 15 to April 1. The contractor shall submit requests to the Contracting Officer for any proposed tree removal activities between April 2 and August 14.

40. The Prevailing Wage Determinations included for this project are for Construction Types Heavy and Heavy Dams. Our review of these wages does not reveal all the normal craft that are used in construction of this type of facility. Specifically, we do not find mechanical, plumbing, sprinkler, alarm, etc. Please consider including a Building Prevailing Wage to cover these additional classifications of work.

Answer: The Building Wage Determination is included in this Amendment.

41. Question: Reference drawing 01-E105. The lift station control panel has a detail callout A/00-E502. There is no detail “A” on drawing 00-E502. Please provide detail.

Answer: Refer to Sheet 01-E105. Revise detail callout on the lift station control panel from A/00-E502 to 1/00-E502. The detail callout is to show an equipment support rack.

42. Question: Reference drawing 01-E100. The permanent auto gate access pedestal has a detail callout 3/00-E503. Detail 3 on drawings 00-E503 is not for a permanent auto gate access pedestal. Please provide correct detail.

Answer: Refer to Sheet 01-E100. Revise detail callout on the permanent auto gate access pedestal from 3/00-E503 to 3/00-T502.

43. Question: Reference drawing 01-E100. The permanent auto gate motor ‘GMO-1’ has a detail callout 4/00-E503. Detail 4 on drawings 00-E503 is not for a permanent auto gate motor ‘GMO-1’. Please provide correct detail.

Answer: Refer to Sheet 01-E100. Revise detail callout on the permanent auto gate motor from 4/00-503 to 4/00-T502

44. Question: Reference drawing 04-CE14. Transformer TX885914 feeds a “waste water treatment” service. Reference drawing 04-CE02, the “waste water treatment” feeder is not depicted. Please provide revised drawing depicting the “waste water treatment” feeder pathway.

Answer: Sheet 04-E101 for estimated existing secondary conductor pathway from the existing transformer to the existing 1Ø service location at the Phantom Ranch WWTP. Locate and utilize the existing secondary conductor pathway for the new secondary conductor from TX885914. Estimated pathway distance is 300’.

45. Question: Reference drawing 04-CE14. The secondary feeders deriving from the single phase transformers are called out as “(4) #1/0 AL XLPE ABR, (2) #2AL AL XLPE ABR, 4” Conduit”. The secondary loads are single phase, can you please clarify why there are (4) #1/0 AL XLPE ABR, (2) #2AL AL XLPE ABR, 4” Conduit to each service.

Answer: The single phase secondary loads will be serviced by (2) parallel runs of 1ph secondary feeders (6 total cables) to help meet 200amps at the service entrance. The (4) 1/0 AL secondary power cables and (2) #2 AL neutral cables in a 4” conduit per service meets Arizona Public Service (APS) secondary conductor standards.

46. Question: Reference drawing 04-CE14. The secondary feeders deriving from the single phase transformers are called out as “XLPE ABR” insulation. We cannot locate an “XLPE ABR” insulation. Is “ABR” an error? Please advise.

Answer: ABR is short hand for “Abrasion Resistant”. This was included to help identify that the XLPE secondary conductor insulation is abrasion resistant. The abbreviation is included to correlate with Arizona Public Service (APS) nomenclature.

47. Question: We note that the project Amendment 5 has written language indicating the postponement of the bid due date, however the Amendment form indicates the date “is not extended”. Please confirm the postponement.

Answer: The proposal due date has been extended to 9/12/22 at 1500 MT. Questions are due 9/5/22 at 1500 MT.

48. Question: Reference specification 26 32 14, section 2.4(D)5. 60dB(A) at 23 feet is called out for the sound attenuated enclosure. This is a very low decibel sound rating which will add to the weight, footprint, and price of the enclosure.

Answer: Acknowledged that a 60dB@23ft sound rating will add to the weight, size, and cost of the generator enclosures. Both generators will be located in noise-sensitive areas, and the specified level of sound attenuation was selected to help protect the soundscape.

49. Question: Due to the logistical weight transportation (helicopter) to Phantom Ranch WTP we recommend a standard sound attenuated enclosure which will have a 75dB at 23 feet. Please confirm 75dB at 23 feet is acceptable.

Answer: A 75dB@23ft sound attenuation rating is not acceptable. Sound attenuation ratings of 60dB@23ft are required. (Please see response to question Q-54.) The manufacturer/distributor of the generator package used as the basis of design was consulted during the project design phase, and they advised that the generator package can be provided in components (generator/fuel tank/enclosure) that can be transported by helicopter.

Amendment 7, issued 9/2/22:

50. Question: The following questions relate to the Phantom Ranch site: Does the Government require one Bladder-Style Surge Tank at this location? What is the design pressure for the Bladder-Style Surge tank? What is the operating pressure for the Bladder-Style Surge tank? What is the desired orientation (vertical or horizontal) for the Bladder-Style Surge Tank? Are there any specific drawing details for the Bladder-Style Surge Tank? Are there any specific specifications for the Bladder-Style Surge Tank? For operation of the Bladder-Style Surge Tank, an air pre-charge is required. Will the Government provide an air compressor for this pre-charge? Should the manufacturer of the Bladder-Style Surge Tank provide an air compressor for the required air pre-charge? Is a liquid level monitoring system required for the Bladder-Style Surge Tank? Are there any available specifications for the liquid level monitoring system? Are there any available detailed drawings for the liquid lever monitoring system?

Answer: There are no surge tanks for either the Phantom Ranch Booster Pumps or the Phantom Ranch Distribution and High Service Pumps. However, there are two hydropneumatic tanks (bladder style), located inside the Phantom Ranch WTP, and associated with the Phantom Ranch Distribution and High Service Pumps. The purpose of the hydropneumatic tanks is to maintain distribution system pressure in Phantom Ranch. These hydropneumatic tanks are shown on Sheets 04-D401 and 04-D402 (among other places) and the tank model or approved equal is noted on those sheets. The Contractor shall be responsible for coordinating compressed air for the hydropneumatic tank pre-charge.

51. Question: The following questions relate to the Havasupai Gardens site: Does the Government require one Bladder-Style Surge Tank at this location? What is the design pressure for the Bladder-Style Surge tank? What is the operating pressure for the Bladder-Style Surge tank? What is the desired orientation (vertical or horizontal) for the Bladder-Style Surge Tank? Are there any specific drawing details for the Bladder-Style Surge Tank? Are there any specific specifications for the Bladder-Style Surge Tank? For operation of the Bladder-Style Surge Tank, an air pre-charge is required. Will the Government provide an air compressor for this pre-charge? Should the manufacturer of the Bladder-Style Surge Tank provide an air compressor for the required air pre-charge? Is a liquid level monitoring system required for the Bladder-Style Surge Tank? Are there any available specifications for the liquid level monitoring system? Are there any available detailed drawings for the liquid lever monitoring system?

Answer: There are no bladder-style surge tanks at the Havasupai Garden site.

52. Question: Construction of Support Facilities. Table of Contents has listed Specification Section 08 33 13 - Rolling Counter Shutter, but Specification is not provided. Please provide the noted specification Section.

Answer: Section 08 13 13 ROLLING COUNTER SHUTTER is included in the specifications on page 416 of Att12a_CSF_Specs_PDF.

53. Question: Construction of Support Facilities. Table of Contents has listed Specification Section 08 34 16 – Vertical Lift Operable Wall Hanger Doors, but Specification is not provided. Please provide the noted specification Section.

Answer: Section 08 34 16 HANGER DOORS is included in the specifications on page 424 of Att12a_CSF_Specs_PDF

54. Question: Question regarding the 1.0 M gallon tanks. Reading through the specification, it does not say anything about the inaccessible space between the rafters and roof plates. Do you know if there are any requirements for the rafters to be seal welded, caulked, or left free floating? AWWA D-100 does not require the roof plates to be welded to the rafters.

Answer: Specification Section 43 41 15, Paragraph 3.3 and Specification Section 09 96 00, Paragraph 3.4.C describe what is to be done at the inaccessible locations between the roof plate and the top flange of rafters. Additionally, there is no requirement to provide sealant or seal welds between the rafter flanges and the underside of the roof plates.

55. Questions: There is nothing in the tank specification, Section 43 41 15, which references the inaccessible space between the roof rafters and the roof plates. Once the tanks are erected this space will not accessible for interior coatings.

Answer: Please see response to Question 54.

56. Question: Are there any requirements for the rafters to be seal welded or caulked to the roof plates? Or is it acceptable to leave the roof plates unattached to the rafters per AWWA D-100 standard?

Answer: Please see response to Question 54.

57. Question: When the bright Angel water line is shut down, so that the slip-lining install can occur. It is unclear how Havasupai Gardens receives Finish water?

Answer: The Havasupai Gardens (HG) distribution system receives potable water from the HG Pump Station discharge and associated existing PRV’s. This is the primary existing source of supply method for the HG distribution system and will continue to be the source of supply during the sliplining. The Bright Angel pipeline backfeed is currently a secondary source of supply to HG and is non-operational in winter months.

58. Question: Plan sheet 01-X01, Note # E. Please provide location that will receive mulched trees and tree logs.

Answer: The NPS intends to dispose of mulch and logs within the S Rim Village area but has not identified a specific location at this time. However, it is assumed the location would be within 5-miles (one-way) of the S Rim WTP site, within the Park, and accessible along paved or all-weather roadways.

59. Question: Under Specification 01 11 00 Summary of Work Paragraph 1.2.B.7 Indian Garden Pump Station Phase III, Pump 3 Replacement there is reference to “(excluding helicopter transport)”. I am assuming this is a remnant from a previous solicitation but would like to confirm that the Contractor will be responsible for their transport of personnel, equipment , and materials at this location the same as the rest of the project.

Answer: Correct. The Contractor is responsible for transport of personnel, equipment , and materials at this location, the same as the rest of the project

60. Question: Sludge Control Panel. Specification Section 46 43 22, Attachment A; Drawings 04-Y101-Y115, 04-Y601,04-Y611-04-Y613. Section 46 43 22, Attachment A-calls out for the sludge collector system to be controlled from either the local Master Control Panel or from HMIs in the Control Room. The section reads for vendor to furnish the control panel. On the P&ID drawings there are no provisions for wiring to the PLC. Can you please advise of wire provisions to sludge collector system.

Answer: Provide the following circuits between the Sludge Collector Control Panel (LCP-2610) and the WTP PLC (SR-PLC-1):

• 1-19/C#14, 1-1/4”C (discrete control signals)

• 1-CAT6, 3/4"C (network signals) Note that the question references the 04-series drawings for Phantom Ranch. There is no sludge collector at the Phantom Ranch WTP. The sludge collectors are located at the South Rim WTP only.

61. Question: 1" Temporary Water Line Havasupai Garden Distribution System. Div. 01, Sec 01 73 40, Item. 3.2, A.1.d., Havasupai Garden Distribution System: Per Div. 01, Sec 01 73 40, Item. 3.2, A.1.d, 1" Temporary water line connecting to the 2" existing copper distribution line. Can we be advised if "Bright Angel Spigot next to pump house" is part of 2" water distribution line or does Spigot need to be provided separately from 1" temporary water Line?

Answer: The Bright Angel Trail Spigot next to the pump house is connected to the Havasupai Gardens distribution system. Temporary water service will need to be provided to the spigot during any period which the spigot cannot be supplied from the distribution system (existing or new) during construction.

62. Question: 1" Temporary Water Line Havasupai Garden Distribution System. Div. 01, Sec 01 73 40, Item. 3.2, A.1.d., Havasupai Garden Distribution System: Per Div. 01, Sec 01 73 40, Item. 3.2, A.1.d, 1" Temporary water line connecting to the 2" existing copper distribution line. Can we be advised if the 1" Temporary water line connecting to the 2" existing copper distribution line will have sufficient pressure to provide water to facilities being fed from 2" copper line system?

Answer: Havasupai Gardens distribution system pressure is regulated by a series of PRVs located within the Pumphouse. These PRVs currently supply potable water at a pressure of 140 psi at the connection to the distribution system. Pressures within the distribution system are about 120 psi in the historical area and 80 psi at the Ranger Cabin. Bypass pipeline size and material should be adequate to provide similar level of service to all connections in Div 01, Sec 01 73 40, Item 3.2, A.1.d.

63. Question: Currently work hours are from 6:00 AM to 6:00 PM within the helicopter Spec the flying hours are from 8:00 AM to 5:00 PM. The flying hours need to match the work hours at a minimum. For both production and safety reasons, or allow flying time from dusk to dawn?

Answer: The specifications are correct and will not be adjusted. Adjustment to stated authorized hours may be considered on a case by case situation through formal request by the contractor to the contracting officer.

64. Question: 1.3.A.3.a-b PE stamps for mixer calculations and loads, torque and forces are requested. This is not typical and can quite of bit of cost to a rather small mixer package. We can provide them if needed. Are these required?

Answer: Provide calculations stamped by an Arizona PE as requested for the South Rim WTP rapid mixers. Stamped calculations are not required for the mixer at Phantom Ranch WTP.

65. Question: 1.3.A.3.d-e We cannot find dimensional drawings for either mixer design. Top of concrete is shown. Can these be clarified?

Answer: For South Rim, the Rapid Mix Basins are dimensioned in plan view on Sheet 01-S103. The section view is best portrayed on Sheet 01-D005. For the mixers themselves, the sizing is per the manufacturer. Mixers should be sized and configured for the basin and tank sizes that they will be located within, provide complete mixing within the basin/tank volume without dead zones, and provide the hydraulic gradients specified in 2.2.A.1.a.2, and 2.2.B.1.a.2.

66. Question: 2.1.A.1-2 Philadelphia and SPX Lightnin are listed. These are the same company. Can Mixtec be added to the list?

Answer: Revise Part 2.1.A.3 to read, “Or approved equal.”

67. Question: 2.3.A.1.b.1 The drawings show all mixers as parallel shaft gearboxes. This specification shows right angle gearboxes. Are right angle gearboxes required only?

Answer: Right angle gear boxes are required.

68. Question: 2.3.A.1.g.4 Dipstick oil indicator. Can we please add “or sight glass”.

Answer: Providing a sight glass is acceptable.

69. Question: 2.3.A.2.b. Bolted blades are very hard to use on small impellers. Can we replace bolted with welded blades? Also, can we remove hook keys and replace that with set screws. Once again this is a very small impeller. Set screws will allow for adjustment.

Answer: Blades for the South Rim Rapid Mixers may be welded. Blades for the Phantom Ranch Reaction Tank Mixer must be bolted to allow for removal of the mixer through the manway. Set screws may be used in lieu of hook keys.

70. Question: 2.3.A.3.a.1 & 2.3.A.3.f: a.1 states no coupling below the reducer and 3.f states to use a coupling. Can we remove line 2.3.A.3.a.1.

Answer: Line 2.3.A.3.a.1 can be removed.

71. Question: Please clarify the contract time allowed for this project. Does the 1,278 calendar days include the 365 days of plant operation by Suez should NPS select this option? If this answer is yes, will the NPS reduce the contract time if they choose not to exercise the Plant Operation Options?

Answer: CLIN 50 and CLIN 60 Will extend the period of performance once the water treatment plants have been approved to be put into operation by permitting authority ADEQ (Arizona Department of Environmental Quality) and contractor starts operating the plant(s).

72. Questions: 1" Temporary Water Line Havasupai Garden Distribution System & Bypass Piping of TWCL during construction. Att2d_Revised _Specs_1_7-5-22”; Section 01 50 00-Temporary Facilities and Controls, Part 3-Execution, 3.2 Temporary Utility Installation, Item E. ATT2c-GRCA_190083_Final_CD_Specifications_Vol_3_Division_26_-_46_1: Section 46 33 12 Interim disinfection System - Chemical Feed, Enclosure, and Accessories. Can we be advised if the 1" Temporary water line connecting to the 2" existing copper from SPH considered "Raw Water" service as part of the interim Disinfection Strategy? Does 1" temporary line require ADEQ AOC permit?

Answer: We assume you are referencing Sheet 03-C105, and specifically connection point #41. Once the TCWL replacement is underway, all potable supply to Havasupai Gardens must come from the South Rim via the Bright Angel Pipeline slipline. As such, the connection will not be “raw water”, but “potable water” as it will have been disinfected using the Interim Disinfection System at the South Rim. Flow from the backfeed from the Bright Angel Pipeline is routed through the South Pumphouse (SPH) and delivered to the distribution system via existing PRV’s in the SPH. Any temporary piping needed for potable supply at spigots, etc. must come from this source. An ATC was not requested by ADEQ because the 1” temporary line falls below the minimum pipe size for their reviews.

73. Question: Interim Disinfection System. ATT2c GRCA_190083_Final_CD_Specifications_Vol_3_Division_26_-_46_1: Section 46 33 12 Part 1, 1.1 Summary Item A.3. Item A.3 reads: After acceptance of demonstration period at the South Rim WTP, remove, clean and salvage to Government temporary system and enclosure. Can we be advised if any remaining chemicals will also be handed over to NPS?

Answer: Yes, any remaining chemicals should be turned over to NPS.

74. Question: Suez Operations Proposal Att2d_Revised _Specs_1_7-5-22”; Section 01 50 00-Temporary Facilities and Controls, Part 3-Execution, 3.2 Temporary Utility Installation, Item E. Att1h_GRGA-190083_Vol_03 Drawings_Pg_421to496_4-22-22; Drawings 03-121, 03-C503,Bypass Construction. Can we be advised if NPS is requiring that the 5-year operations plan be included with Suez technical proposal?

Answer: The referenced drawings listed in this question are not associated with the Suez operations proposal. The 5-year operations plan is for the South Rim WTP and Phantom Ranch WTP only and will be sole-sourced to Suez. The operations contract will not include operation of the TCWL, which will continue to be operated/maintained by the Park after construction. Yes, a proposal and cost for the 5-year operations plan should be included with the Suez technical proposal.

75. Question: Havasupai Garden Distribution System New Valve Vault. Att1h_GRGA-261633_IG_Pump_3_Volumne_06_2-24-21: Drawings S1-S4 Manufacturer ARMOROCK quoted dated 08/25/22 (See Attached " RFI No. 19 ARMOROCK"). Given the manufacturer’s quote, the valve vault is not light enough to transport by helicopter. The precast valve vault is sectioned into 3 parts with each segment approximately weighing 30,000 lbs. The constraints of the helicopter weight capacity will not allow such lift. Please advise if FRP suitable material would be allowed?

Answer: Sheet S4 in Volume 6 (Indian Garden Phase 3) depicts the individual slab, wall, and deck panels that are intended to be flown in separately and assembled together on site. The panels have been designed so that they can be flown in by helicopter, including lifting hook locations as shown on Sheet S4. It is not the intent to have three individual precast segments for the construction of the vault.

76. Question: Phantom Ranch Raw Water Pump Station Controls – Romtec Utilities is unclear if controls and level sensing should be included as part of the packaged lift station design and supply for the Phantom Ranch Raw Water Pump Station. Are controls and level sensing to be included as part of the package pump station?

Answer: The design intent was for the hardware SI supplying other PLC CPs to supply the controls and level sensing. If vendor supplies, all components must be as required under the Div 40 Specifications and not standard vendor preferences.

77. Question: South Rim Waste Lift Station Controls – Romtec Utilities is unclear if unclear if controls and level sensing should be included as part of the packaged lift station design and supply for the South Rim Waste Pump Station. Are controls and level sensing to be included as part of the package pump station?

Answer: Design intent was for the hardware SI supplying other PLC CPs to supply the controls and level sensing. If vendor supplies, all components must be as required under the Div 40 Specifications and not standard vendor preferences.

78. Question: Phantom Ranch Raw Water Pump Station Structures – The wet well and valve vault structures for the Phantom Ranch Raw Water Pump Station as shown on Sub Sheet #04-C402 are likely too small to provide proper clearance for equipment installation and maintenance. Is it acceptable to propose larger wet well and valve vault structures for the PR Raw Water Pump Station?

Answer: The sizes shown on the Drawings have been approved by Park Compliance. For purposes of bidding, the Contractor should price the structures with the dimensions shown. The Contractor may discuss an alternative structure design and provide a description of benefits as part of their technical proposal.

79. Question: Reference specification section 40 61 93 (Appendix I/O List). There is no I/O listing for Indian Garden. Please provide I/O listing.

Answer: There is no separate I/O list in the Specifications for Indian Garden Phase 3 work. Please reference General Note 3. on Sheets Y8-Y11 of the Phase 3 Drawings and revise the first sentence of the note to read as follows, “I/O PER P&ID DRAWING Y3-Y5.”

80. Question: Reference the Indian Garden instrumentation drawings (Y3 thru Y5). The instrumentation P&ID diagrams depict instrumentation devices that are not listed in the specifications (reference specifications 40 70 00 thru 40 75 00). Please provide specifications for the Indian Garden instrumentation devices.

Answer: Please use the attached Section 40 91 10 for instrumentation at Havasupai Gardens (formerly known as Indian Gardens).

81. Question: Specification section 03 47 00 Site Cast Concrete, paragraph 2.1,B1 “Site Collected natural silt, sand and fine aggregate.” Please advise as to the location where the noted materials can be harvested.

Answer: The intent is for the Contractor to harvest these materials from the Phantom Ranch Delta. This area is generally shown within the limits of construction on 04-C101. A primary source of material will be the Phantom Ranch WTP excavation.

Amendment 8, issued 9/8/22:

82. Question: We have not been able to identify the specification under which the Pump 3 Replacement is listed. Please indicate the pump specification for this equipment.

Answer: The Horizontal Multi-stage Pump specification is provided with Amendment 6.

83. Question: 2.1.B.1.a.4. An overhead drawing of the mixer is the FRP tank spec. Diameter is stated in the spec, but height, liquid level and the mount area is not apparent. Can we get another dimensional drawing of this tank?

Answer: The Phantom Ranch Reaction Tank will be 5 feet in diameter and will have a conical bottom as shown in the Drawings; see Sheet 04-D301, Section B. The design height of the tank will be approximately 9.5 feet, comprised of approximately 6.0 feet of straight side and 3.0 feet of conical depth. The water level will vary between 2.000 feet and 4.625 feet starting at the point where the conical section converts to the straight cylindrical section. The lower impeller must be submerged at all times. Manufacturer to determine whether an upper impeller is required and whether an upper impeller must be submerged. Please note that the manway opening for the mixer will be centered on the top of the tank, which differs from the drawing included in the FRP tank spec.

84. Question: Reference drawing 04-Y601. The “PR WTP NW RACK” has a singlemode fiber that connects to “Phantom Ranch Operator Cabin”. The Phantom Ranch Operator Cabin is not depicted on the site plans. Please provide location of the Phantom Ranch Operator Cabin.

Answer: Please see Key Note 4 on Sheet 04-E101 for location and proposed route of single mode fiber to Phantom Ranch Operator Cabin. Key Note 4 shall be revised to reflect single mode instead of multimode, to align with network diagram.

85. Question: There is nothing in the tank specification, Section 43 41 15, which references the inaccessible space between the roof rafters and the roof plates. Once the tanks are erected this space will not be accessible for interior coatings. Are there any requirements for the rafters to be seal welded or caulked to the roof plates? Or is it acceptable to leave the roof plates unattached to the rafters per AWWA D-100 standard?

Answer: Specification Section 43 41 15, Paragraph 3.3 and Specification Section 09 96 00, Paragraph 3.4.C describe what is to be done at the inaccessible locations between the roof plate and the top flange of rafters. Additionally, there is no requirement to provide sealant or seal welds between the rafter flanges and the underside of the roof plates.

86. Question: Plan sheet 01-X01, Note # E. Please provide location that will receive mulched trees and tree logs.

Answer: The NPS intends to dispose of mulch and logs within the S Rim Village area, but has not identified a specific location at this time. However, it is assumed the location would be within 5-miles (one-way) of the S Rim WTP site, within the Park, and accessible along.

87. Question: For the Trench Grating per 06-S102 calling out Detail 3 / 06-S301 , what is the Material? Does it need to be Serrated? Does it need to be H20 Traffic Rated? Please advise.

Answer: The material is specified in Section 05 50 00, Paragraph 2.3.E. It does not need to be serrated. Yes, it should be H20 traffic rated.

88. Question: For the Elevator Pit Grating per Detail 4 / 06-S302, what is the material? Does it need to be Serrated?

Answer: The grating does not need to be serrated. It only needs to be perforated.

89. Question: Specification section 43 41 15 Field Erected Welded Steel Tanks, paragraph 2.3 .I - Cathodic Protection System - 1. &2. State "Contractor to coordinate with the cathodic protection supplier." Who is the cathodic protection supplier? In light of the lack of any specification for cathodic protection systems, what is the Contractor to provide? Please Advise.

Answer: The cathodic protection (CP) design and installation shall be incorporated into the tank supplier’s responsibility as part of performance Specification 43 41 15. The tank supplier may choose to self-perform this work, or subcontract it out, provided the following requirements are met: -CP system design shall be “ice-free” anodes with no external power requirements. Impressed current systems will not be allowed. -CP system design shall be prepared by a Corrosion Expert with 5 years previous experience, 3 similar installations, and AMPP/NACE CP-4 certification. -CP system shall be installed by a Cathodic Protection Technician with AMPP/NACE CP-2 certification or higher. Corrosion Expert shall oversee the installation. -Submittals: Drawings, calculations, product data, spare parts list, and qualifications/certifications for Corrosion Expert and Corrosion Protection Technician.

90. Question: Construction of Support Facilities. Table of Contents has listed Specification Section 08 33 13 - Rolling Counter Shutter, but Specification is not provided. Please provide the noted specification Section.

Answer: Section 08 13 13 ROLLING COUNTER SHUTTER is included in the specifications on page 416 of Att12a_CSF_Specs_PDF.

91. Question: Construction of Support Facilities. Table of Contents has listed Specification Section 08 34 16 – Vertical Lift Operable Wall Hanger Doors, but Specification is not provided. Please provide the noted specification Section.

Answer: Section 08 34 16 HANGER DOORS is included in the specifications on page 424 of Att12a_CSF_Specs_PDF

92. Question: Drawing 03-C121 reach 3 to reach 7 Replacement of the package 3 TCWL system requires the installation of a Bypass Line. What was the designer of record (DOR) intent regarding temporary Bypass waterline that meets or exceeds 750 lbs PSI. Please provide type and size of material for required Bypass waterline.

Answer: The bypass piping diameter is 4”, as specified on Sheet 03-C503. The bypass piping material selection is up to the discretion of the Contractor, so long as it meets the maximum pressure requirements shown on Sheet 03-C121 for each reach. The basis of design for the higher pressure areas was to bypass using a composite pipe material, similar to that specified for the slipline pipe in Project Area 02 (Bright Angel Pipeline) and Project Area 05 (Roaring Springs to Cottonwood Campground). Please reference Section 33 11 13, Part 3.4 for additional requirements for bypass piping.

93. Question: South Rim Waste Pump Station Pumping Rate: Sheet 00-C511 states a peak design flow of 300 GPM @ 65.7’ TDH. Spec Section 45 23 13 (2.2 D.2.) specifies a design condition of 177 GPM @ 27.7’ TDH. What is the design peak duty point for the SR Waste Pump Station?

Answer: The peak duty point for the lift SR Waste Pump Station is 300 gpm @ 31.6’ TDH. This is with two pumps in operation so each individual pump will match the pump specification in Section 43 25 13 (2.2 D.2). As such, the following drawing and specification modifications are made: On Sheet 00-C511, Detail 2 Pump Station Design Details, the normal flow (gal)/TDH (ft) for the SR Domestic Waste should be changed to 177 / 26.7 On Sheet 00-C511, Detail 2 Pump Station Design Details, the normal flow (gal)/TDH (ft) for the SR Domestic Waste should be changed to 300 / 31.6. Specification Section 43 25 13, 2.2 D.2 to be changed to: Design Condition: Flow: 177 gpm (normal), 300 gpm (max). Head: 26.7 ft (normal), 31.6 ft (max)

94. Question: Reference specification section 40 61 93 (Appendix I/O List). There is no I/O listing for Roaring Springs (reference drawing 05-Y101). Please provide I/O listing.

Answer: Provide I/O per P&ID on Sheet 05-Y101. Allow 25% minimum spare I/O.

95. Question: Reference the Roaring…