B09_Amendment_05_Answers_to_Questions_0005.pdf

140P2026R0101 / Amendment 05/

09.17.2026

GRCA 257282, Replace South Rim Wastewater Treatment Plant

Question No. Sheet or Reference Question Response

1 Ref. 25S1020 Process Tanks Structural Lower Level Plan; What size are the (2) columns 10’-0’ North of Line 1?

The columns are W12x45. Callout provided by markupon drawing 25S1020 (attached to Addendum 3).

Ref. 1/25S5001 Moment Connection; The perpendicular beam connections to the column web are called out as 0512-020. These beams are not erectable due to the presence of the 3/8” stiffeners above and below the beam connection. Please advise.

New connection detail and callouts provided for the beam to column web connection. Markups provided on drawings 25S1040 and 25S5001 (attached to Addendum 3).

3 Ref. 1/87S1030 “Armor Angles”; What size are the angles? Size and spacing of the headed studs?

Use SST L3x3x¼. Markup provided for drawing 87S1030 (attached to Addendum 3).

Ref. 09 90 00 Painting and Coatings; We assume all structural steel is to be shop primed with System No. 5 Exposed Metal – Mildly Corrosive other than the steel roof trusses which are to be shop primed with System No. 4 Exposed Metal – Highly Corrosive. Please confirm.

Steel roof trusses and monorails shall be shop primed with System No. 4 Exposed Metal – Highly Corrosive. All other structural steel shall be shop primed with System No. 5 Exposed Metal – Mildly Corrosive. Refer to Addendum 3.

Are CAD (electronic) files available for the Water Treatment Plant site grading plans ( original ground topography, final grade, top of pavement etc.)? Are CAD (electronic files) available for the Access Road? Are CAD (electronic) files available for underground pipe and utilities? If so, please provide.

Do to large file size, CAD files will be provided after award.

6 The PDF file of the specifications is "protected" making it difficult to use. Please provide an un-protected version for contractor use. Yes. Refer to the zip file called "GRCA_Final_Individual_Specs".

Regarding the Contractor Laydown Area, please provide location of Contractor Laydown Area (8-acre site). Confirm if the site has crushed aggregate surfacing, fences and gates already installed by others. Is temporary power, water, SS available on the site?

This question will be answered in an upcoming amendment.

01 50 00 Temp Facilities states Potable water service is available for use. Where is the water source located? What is the rate of water that can be provided?

There is a potable water line on sheet 07Y1000 that is distinguished with a "W" linetype on the sheet in the Northeast corner of the site.

A flow test would need to be conducted to determine the existing flow rate.

Access Road Spec 31 10 00-4 Site Clearing Section 3.08 States that saleable logs will remain property of Government and be stored in designated location. Please define "saleable" logs that are to remain the property of government. Where is the stockpile location (haul distance)? Ponderosa Pine with a 12" DBH or greater. Stockpile in a location along the Access Road as directed by the Contracting Officer.

Provide location of spoils storage & stockpile location. Clarify if areas is fenced or if contractor is required to fence the area.

This question will be answered in an upcoming amendment.

11 What is the use charge for potable water? Are they hydrants on site available for construction water?

This question will be answered in an upcoming amendment.

12 Please confirm the location for the contractor to install the temporary offices for NPS? Is there water, power, SS on site?

The plant and offices are to remain operational during construction, with designated outages being coordinated in advance. On sheet 06C2101 Note 7 shows where the existing electrical and connex boxes may be relocated during construction.

Will as built drawings of the existing WWTP be provided? As-built drawings will be provided as available.

Temporary Facilities 05 50 00 - 8 C Temporary roads and paved areas - provide dust control treatment. Is water sufficient for dust control or is the intent to apply a different dust control material? Water is sufficient for dust control treatment.

15 01 57 13 -11 Temporary Erosion Control Section 2.09 refers to a Wheel Wash Facility. Is a wheel wash facility required? A Wheel Wash faciity is not required. The Wheel Wash Facility section will be removed from the specification.

Question No. Sheet or Reference Question Response

The contract documents includes a detailed a Temporary Erosion and Sediment Control plan ( TESC) for the WWTP showing phased BMP's for construction (silt fence, etc.). Please clarify is the contractor required to prepare a completely independent SWPPP and BMP design for the WWTP site? Or is the contractor expected to utilize the TESC plans as prepared by the designer for the basis for the SWPP and implement and maintain? If revisions to the provided TESC plans are required by the contractors prepare will those revisions required approval by designer and NPS prior to implementation. The contractor is required to develop TESC plans and BMP details for the WWTP site refer to Section 01 57 13.

The South Rim WWTP site includes a detailed TESC drawings and BMP layouts.

However, no similar TESC plans or BMP details appear in the provided access road improvement project plans. Please clarify, is the contractor required to develop and design all TESC for the access road portion of work? Are temporary BMP's required along the access road corridor? Did the designer determine that BMP's are not required due to the nature of the roadway work or were they intentionally left for the contractor to design? The contractor is required to develop TESC plans and BMP details for the Access Road corridor refer to Section 01 57 13.

Section 31 23 23 permits the use of excavated bedrock that has been crushed, processed, and approved by the Contracting Officer for use as Granular Fill. The Geotechnical Recommendation Memorandum identifies corrosive soil conditions and provides recommendations regarding earthwork and backfill materials.

Please clarify: 1. Is compliance with the specified gradation requirements alone sufficient for approval of crushed onsite bedrock as Granular Fill?

2. Are additional material property requirements required for processed bedrock including: a. Soil resistivity b. Sulfate content c. Chloride content d. pH e. Other chemical or corrosion-related properties

3. Does the term "processed" mean crushing and screening only, or are additional treatments, blending, or modifications required to achieve acceptable backfill material?

4. May processed onsite bedrock be used for all Granular Fill, Structural Backfill, Foundation Backfill, and Utility Backfill applications shown in the Contract Documents?

5. If chemical properties of the processed material do not meet geotechnical recommendations, what imported material criteria should be used for bidding purposes?

1. Yes, based on the GRR the concrete and pipe coating were designed to account for the measured corrosivity in the existing soil and bedrock that may be used for backfill material

2. No, no additional material property requirements are required.

3. Yes, the term processed means crushing and washing the material through a seive until it reaches the required gradation.

4. No, processed onsite bedrock may only be used where Granular Fill is noted. The other fill types listed in the question have specific material to use.

5. Crushed rock that meets the gradation as noted in the specification and corrosivity that matches or is lower than what was found onsite.

Specification Fill and Backfill 31 23 23-7 Section 3.04 A-1 " Unless otherwise shown, place proceeded earth fill as follows" - Proceeded looks like a typo please clarify. This is a typo. Should be "Processed." Will update in the specification.

Trench Backfill 31 23 23.15 Section 3.08 C Granular Backfil - please confirm the "granular backfill" material requirement is to be Granular Fill per section 31 23 23 Section 2.03 Granular Fill ( 1" minus) or is it a different product? If so, provide material characteristics. This is the same product.

Please clarify locations where processed earth backfill is required. Where all excavation has occurred and another material is not called out on the drawings or specified.

The locations to install Tree Protection Fencing are shown on the Landscape Plan for the plant site. The access road does not have a set of landscape plans and the tree protection fence is not shown. Will tree protection fence be required along the access road and if so in what locations?

Comply with 31 10 00 Site Clearing. Protect trees along the Access Road that are located outside the clearing limits but their drip lines extend within the clearing limits. The Contracting Officer will provide addtional direction for individual trees.

Is the silt fence shown on the landscape plans to remain in place after hydro mulch is placed and the project is complete, or is all silt fence temporary and to be removed prior to substantial completion? The silt fence is temporary and to be removed prior to substantial completion.

Specification Section 03 39 00, Concrete Curing, paragraph 3.01.A.3, requires water curing only for potable-water structures. Please identify which structures are considered potable-water structures under this requirement.

No structures on this project are for potable water. Water curing is the preferred curing method for concrete elements where reasonable.

Other listed curing methods are acceptable.

Note 1 on Plan Sheet 01S5002 specifies a minimum 28-day compressive strength of 5,000 psi for all concrete columns, while CIP Concrete General Note 1 on Plan Sheet 01S0002 specifies 4,000 psi. Please clarify which minimum 28-day compressive strength governs for concrete columns. On drawing 01S5002, replace "5,000 PSI" with "4,000 PSI"

Section A on Plan Sheet 18S1030 depicts a 6" x 6" concrete curb on concrete fill and references Standard Detail 0330-080. Standard Detail 0330-080 shows #5 dowel bars at 12 inches on center. Please clarify whether the dowel bars are intended to be embedded in the concrete fill or extended into the vault slab. The dowels for the curb may be post-installed dowels into the concrete fill only.

At Grid B, Plan Sheet 20S1030 depicts a feature looking like a concrete equipment pad on the right side of the CMU wall and references Section G. However, Section G on Plan Sheet 20S3004 shows a slab-on-grade on the left side of the wall and finished grade on the right side, which appears inconsistent with Plan Sheet 20S1030.

Please clarify whether slab-on-grade is required on both sides of the CMU wall. If so, please provide a std. drawing number on the equipment pad.

Section G has a "SIM" designation and is called out for the footing only.

Section L, Factor 1 limits the Prime/General Contractor’s Wastewater Plant Construction Project Experience Narrative to eight (8) pages for up to five projects completed within the past eight years. Please confirm that the Project Experience Questionnaire provided in Attachment 8 is to be completed for each project and that the completed questionnaires are excluded from the applicable page limit.

Yes, please complete the Project Experience Questionnaire (Attachment 8) for each project. The completed questionnaires are to be submitted separately and are excluded from the eight-page limit for the Prime/General Contractor’s Wastewater Plant Construction Project Experience Narrative. The eight-page limit applies only to the narrative portion describing up to five projects completed within the past eight years.

B09 Amendment 02 included a document containing questions for evaluators to consider within each evaluation section. The questions and Factor order appear to reference a different project and do not align with the current solicitation. Please confirm this was intentional or if it was supposed to be the evaluation questions corresponding to this solicitation, based on the screenshot shown during the pre-bid presentation?

The correct document (B09_Amendment 05_Questions Evaluators Will Ask) is attached in Amendment 05.

Specification Section 26 05 02, Paragraph 1.04, and Drawing 32E50001 General Note A appear to contain conflicting requirements regarding the division of responsibilities between APS and the Electrical Contractor. Please clarify the scope responsibilities of APS versus the Electrical Contractor, specifically identifying which party is responsible for:

1) Installation of Primary Cabling from APS furnished utility pole to transformer.

2) Furnishing of equipment

3) Installing utility-furnished equipment

4) Testing and commissioning utility-furnished equipment

The following 8 items from APS service manual :

1. Contractor shall provide trench, conduit, backfill and 3 phase transformer pads. Contractor shall install conduit, backfill, 3 phase transformer pads and APS provided equipment pads/box pads, pull boxes, J-Boxes and manholes. These items shall be provided and installed according to the Trenching Agreement and the Facilities Installation Specifications provided by APS for the installation.

2. APS shall be responsible for surveying and inspecting all trench, conduit and equipment installations outlined in #1 above. Customer shall provide easements for trench routes, equipment locations, and secure all necessary permits required by local municipalities and/or governing agencies.

3. Contractor shall have property corners and other control points as requested, installed and flagged before APS will survey the job. In addition, easements, alleys, streets and water retention areas adjacent to proposed trench route must be graded to within 6" of finished grade and grade stakes set before APS approves trench and begins construction.

4. Contractor shall be responsible for having all existing underground facilities located and identified in the field before excavation begins.

5. APS approved and Contractor provided concrete duct shall be installed. Concrete cap shall consist of 3000 lb. concrete at 28 days, 4 inches thick and 2 inches minimum on all sides. Trench depth shall be as specified by APS for the voltage utilized.

6. APS will not energize underground cable until the trench depth is verified and backfill is compacted with a minimum of 24" of cover for secondary/service and 36" of cover for primary, unless otherwise shown on the APS approved plans.

7. Contractor shall restore, at customer’s expense, any damaged landscaping or property to it’s original condition due to Customer provided trenching, backfilling, or equipment installations.

8. APS reserves the right to inspect all and every part of Contractor’s work during or after completion of trenching, conduit installation, shading, backfilling or compaction. If all or any part of the work has not been done according to APS specifications, Contractor shall take corrective action at Contractor’s expense.

Drawing 32E50001 references Sheet Note 14; however, Sheet Note 14 cannot be located on the drawing. Please confirm that the reference is intended for 08-SWBD- 01 Sheet note 14 applies to the main breaker of 08-SWBD-01 not at 32-SWBD-01.

Drawing 06X1002 indicates the existing utility-owned transformer is to be demolished. Please clarify the Electrical Contractor's responsibilities regarding the removal, disconnection, handling, transportation, and disposal of the existing transformer. If the transformer is utility-owned, please confirm whether demolition and disposal will be performed by the utility or are to be included in the Contractor's scope. Electric utiltiy is responsible for transformer, primary cables, and utility poles. Contractor is responsible for all other pads, pull boxes, conduit, wire.

Specification Section 26 05 33 does not include Stainless Steel 316 Conduit but it is called out on the Area Classification and Materials Drawings 01G0250 and 01G0251. Please provide specifications for Stainless Steel 316 conduit.

Stainless steeel conduit shall be rigid schedule 40, 316L complying with ASTM-A12 and

NSF/ANSI 169

Drawing 08E7002 shows the ductbank schedule for DB-12. The line item for 32- MCC-01 to PMP-2512 calls out conductors as P14, P19. Referencing the table on 01E0002 this tells us these are 1"C and 3/4"C respectively with their own conductors.

Is the intent of this line to have 2 separate conduits in the ductbank or are they to be combined into a singular conduit? Two seperate conduits are required.

Drawing 32EP1030 shows VFD's 3320/3420/3520 as free standing units but Drawing 32E5002 shows them integral to 32MCC01. Please confirm which is correct.

VFD's 3320/3420/3520 are to be free standing.

Please confirm that DB01, DB02 and DB03 are intended to have empty conduits for all lines labelled with "Utility Conductors". Refer to item 30 above.

Drawing 20EF1030 does not show any internal emergency backup lighting. Please confirm this is correct. Headworks building 20 does not have battery backup lighting and relies on generator power for emergency egress lighting.

Drawing 08E7002 shows the ductbank schedule for DB-12. The line item for LCP- 3201 to JBX-3450 shows combining analog and control circuits but this contradicts specifications 26 05 02 Section 3.3. Please revise the ductbank section or specifications accordingly.

There are 7 line items in DB-12 that incorrectly call out only 1 conduit for analog and control conduits. these 7 line items are to have 2 conduits each, one for analog and one for control circuits.

Please confirm that the PIC is not responsible for providing "repair or replace software or software subscription" as currently called out in specification 40 90 00

1.09 Maintenance. All software is to be provided by the SI. Hardware System Integrator (Contractor) is not responsible for Plant PLC and SCADA software.

Per General Yard Piping Note 6 on sheet 01C0001 extra protections are required if potable water lines are run within 6' horizontal and 2' vertical or below sewer mains.

Please clarify which system designations would be considered sewer mains for these conditions to apply to.

All pipes that are not potable water need to maintain this distance without protections. Any line that is not a potable water line requires extra protections to be within the given distance to the potable water line.

General Sheet Note A on drawing 20E1040 states "bond all metallic objects within 6' of roof and down conductors'. Please confirm all objects intended to be grounded are shown on the plan

Metal objects include objects shown on 20E1040 as well as any metal materials such as door frames, window frames, louvers, louver frames, and similar objects not generally shown in electrical plans.

42 Note 5 on drawing 20EP1030 references detail 2605-205b which does not appear to be part of the details provided. Please provide this referenced detail. This is a typo, the detail to use is 2605-005.

There is a panel symbol shown on 10EP1030 in the electrical room on the lower right corner that does not have a label, only (26). Please identify this panel and clarify if the (26) is intended to refer to Note 26 on this page.

That is the fire alarm control panel and it is connected to panel 10-LP-01, circuit 26.

Specification 26 05 33 section 3.04 conduit application states "Refer to Area and Material Classification Sheets on the Drawings for conduit applications, unless otherwise indicated below." Please confirm that the statement "unless otherwise indicated below" is intended for that list to take precedence over the material classification table when in conflict.

Correct, the statement "unless otherwise indicated below" is intended for the specification list to take precedence over the material classification table when in conflict.

Type X1 light fixture is shown as a surface mount exit sign and as a architectural pole mount exterior fixture. Please provide clarity between these two fixture callouts and that there are no X1 pole mounts on the project. X2 on right side of sheet 08E6002 should be deleted and X1 on right side re-labeled X2.

Plan Sheets 80S1030, 80S1040, and 80S1050 depict stairs between Grids B.7 and C and reference Section C on Plan Sheet 80S3001 and Standard Detail 0551-004, Type A. Section C on Plan Sheet 80S3001 references Details G and H on Plan Sheet 80S3002, both of which depict elevated concrete slabs at the stair landings. However, Standard Detail 0551-004, Type A, depicts aluminum grating at the landings, and Section C on Plan Sheet 80S3001 appears to show aluminum grating at the landing toward Grid 1. Please clarify whether the stair landings toward Grid 1 are to be constructed as elevated concrete slabs or aluminum grating.

Landings at each floor levels are elevated concrete slabs. Intermediate landings are grating as indicated in the standard detail.

The solicitation incorporates FAR 52.225-11, Buy American – Construction Materials Under Trade Agreements, Alternate I (Nov 2023).

FAR 25.1102(c)(3) prescribes use of FAR 52.225-11 Alternate I for construction acquisitions valued at $6,683,000 or more but less than $13,749,689. Based on the anticipated magnitude of this procurement, the contract value is expected to exceed the upper threshold prescribed for Alternate I.

Please confirm whether inclusion of Alternate I is intentional and applicable to this procurement.

Alternate I is replaced with FAR 52.225-11 (basic).

Plan Sheet 87S1030 shows four 20" dia. concrete columns and notes that their locations are to be coordinated with the mechanical drawings. However, no standard detail or other design information for these columns could be located. Please provide the applicable column details, including dimensions, reinforcement, and foundation requirements. See markups on drawing 87S1030 included in Addendum 4.

Drawing 80D3002 Section G has a material delineation on the 4" RS line of HDPE UG and CS AG. The pipe schedule only allows for HDPE to be used for <4" RS.

Please confirm material callout is correct

AE Response: 3" HDPE RS in the yard transitions to 4" (see 80D3002 in Addendum 4) right before going under and into Facility 80 to transition to 4" CSP before tee with the 4" CSP WAS. Keep short section of UG 4" RS as HDPE as shown on 80D3002. V405 after sample port should be 4". Standard detail for insulated flange on 4" WAS should be 2642-925.

Detail 1 on Plan Sheet 87S1030 depicts armor angles but does not provide sufficient fabrication information. Please provide the applicable details, including angle size and thickness, stud size and length, and stud spacing.

Use stainless steel L3x3x¼ with ½ dia x 4" long studs @ 12" o.c.

Specification 05 12 00, Section 2.04. A.6. states to fabricate beams with rolling camber up.

Please confirm if additional camber is required outside of the milling/rolling process.

Please provide details if additional camber is required.

Camber, if any, will be called out on framing plans: example: W12x16 (c = ¾"). Othewise, no camber.

Please identify the required finished pond-bottom material and whether any impermeable liner for the Stormwater Pond shown on Drawing 06C2402 .

No impermeable liner is requested for the stormwater pond. The finihsed bottom of pond material was assumed to remain as native soil as excavated down to. The native soil has a low permeability. On sheet 06L2000 the pond bottom is hatched to show use for hydromulch as specified in the landscape schedule on sheet 06L5001.

Note 12 on Plan Sheet 06C2001 and Note 18 on Plan Sheet 06C2002 call for trench drains and reference Standard Detail 3344-790. However, the required dimensions of the precast trench drains could not be located. Please provide the required width and depth. In addition, Standard Detail 3344-790 indicates that a preferred manufacturer and product may be specified. Please provide the applicable manufacturer and product information, if required.

Detail 3344-790 Note 1 says to "see manufacturer's specifications for channel depth and width. Install in accordance with manufacturer's instructions." A preferred manufacturer is not indicated. We call out on the detail the requirements of an HS-20 rated grate and that the trench drain bottom shall ahve a 0.50% built in slope and 4" bottom outlet for the manufacturer to meet.

Plan Sheet 18S1030 references Specification Section 07 11 13B for bituminous dampproofing on the exterior of the vault. However, this specification was not included in Addendum 1. Please provide Specification

Delete "Section 07 11 13B" and replace with "Section 07 14 00". Reference revised drawings sheet 18S1030 provided in Addendum 5.

We would like to confirm that exposing a portion of the existing buildings during excavation for the Modular Block Wall at the Administration Building is acceptable. Attached shows the excavation requirements between the new Building 10 (Administration Building) and the existing buildings 91 & 92 (The Pretreatment, Blower, and Digester Building and the Aeration Tanks). Based on a 5 foot excavation from the face of wall to accommodate the largest bottom gravity block, and excavating at a 1.5 to 1 slope, we would expose approximately 2 feet of the building below the current existing grade. Please confirm the assumption that shoring would not be required to support the existing buildings in this condition.

Typically it is assumed that exposing the building at this depth, based on how deep the foundation sits, is acceptable. The current building condition was not evaluated and is uncertain how it will react without additional shoring. This is for contractor's means and methods.

56 Is the existing Backwash Holding Pond (Facility 99) lined with an impermeable membrane to prevent seepage into surrounding grading operations.

This is unclear from as-builts. The soil tests from the site point to soils with low permeability.

Please confirm that during the excavation for Building 25 (Process Tanks), there is no support of excavation required to support / prevent seepage of the existing Backwash Holding Pond into the new excavation. The attached image shows that the excavation limits for the new Process Tanks Building would daylight at elevation

6772.5. The lowest Pond contour provided by design is at elevation 6766.00. The new excavation would thus be approximately 6.5 feet above the lowest design contour elevation. Please confirm this is acceptable.

Contractor to account for seepage if water is held in pond during construction. Temporary shoring will be under the contractor's means and methods.

Please provide missing attachment (02 B08_Att 02_GRCA257282_CD_Specifications_June2025).

See Amendment 01 for this attachment.

59 Per Addendum 02 will section L be revised and updated? The Amendment is the revision.

60 Ref. 25S1020 Process Tanks Structural Lower Level Plan; What size are the (2) columns 10’-0’ North of Line 1?

This question will be answered in an upcoming amendment.

Ref. 1/25S5001 Moment Connection; The perpendicular beam connections to the column web are called out as 0512-020. These beams are not erectable due to the presence of the 3/8” stiffeners above and below the beam connection. Please advise.

This question will be answered in an upcoming amendment.

62 Ref. 1/87S1030 “Armor Angles”; What size are the angles? Size and spacing of the headed studs?

This question will be answered in an upcoming amendment.

Ref. 09 90 00 Painting and Coatings; We assume all structural steel is to be shop primed with System No. 5 Exposed Metal – Mildly Corrosive other than the steel roof trusses which are to be shop primed with System No. 4 Exposed Metal – Highly Corrosive. Please confirm.

This question will be answered in an upcoming amendment.

B09_Amendment_02_GRCA_257282_SR_WWTP_PreBid_Mtg_presentation_(8-11- 26)_FINAL_0002.pdf; Page 4

B08_Att_01c_GRCA257282_CD_Drawings_and_Details_Combined_June2025_Par t3.pdf; Page 12 The final bullet on page 4 of the pre bid presentation indicates "Process Control System Integrator (SI) for South Rim WWTP PLC and SCADA Integration will be handled under a separate contract".

On Drawing 113 I&C Network Architecture Drawing there is a note "All the site specific control system devices (i.e. network switches, firewalls, PLCs, SCADA Servers) to be install and configured by the contractor". Please clarify the scope of supply required by the contractor with regard to the SCADA and PLCs for the project. Also please clarify if the Automation Direct 205 PLC's depicted in the drawings are included in this contract scope of work.

This question will be answered in an upcoming amendment.

Pipe heat tracing, per spec 40 05 33, calls out the maximum pipe exposure temperature: 482 degrees F (2.03 D 3). The heating tape called out, in 2.03 A 1, is Thermon; BSX, or equal, it has a maximum exposure of 185 degrees F. There is not a self-regulating heat tape that can withstand 482 degrees F. Is the pipe exposure temperature correct or does a Mineral Insulated heat tape need to be used that can withstand the 482-degree exposure temperature?

This question will be answered in an upcoming amendment.

There is no warranty requirement information outlined in equipment specifications.

Please confirm that a warranty for 1 year after equipment delivery is acceptable or provide details of requirements.

This question will be answered in an upcoming amendment.

26 29 23-2.04.D - Outlines requirements for VFD output filters based on the length of the motor leads. The control panel appears to be mounted in the same building as the grit equipment. Please confirm that VFD output filters are not required for the grit equipment.

This question will be answered in an upcoming amendment.

44 42 41 – 2.04.B & C Specifies Maximum Water Content in Washed Grit Product of 10 percent and Maximum Volatile Solids Content in Dewatered Grit Product of 5 percent. This level of performance is only achieved with a fluidized bed grit washer which is not the specified technology. The specification should be modified to reflect the specified technology (OpTeaCup & Grit Snail) which is capable of a Maximum Water Content in Washed Grit Product of 40 percent and Maximum Volatile Solids Content in Dewatered Grit Product of 20 percent when grit system influent contains > 2 ft3/MG.

This question will be answered in an upcoming amendment.

44 42 41 – 3.04.B Requires Performance testing of the Grit classification and dewatering unit. Please confirm who is responsible for performance test costs, contractor or manufacturer?

This question will be answered in an upcoming amendment.

44 42 41 - Includes a reference to 40 99 90 for the panel to meet the function and performance characteristics outlined in it. Section 40 99 90 includes many requirements for PLC based panels, PLC spare parts, and onsite programming services. Please confirm that the PLC requirements, spare parts, and onsite programming services outlined in section 40 99 90 are not applicable to the grit system control panel.

44 42 41-2.05.A.1.b - Outlines a NEMA 4X main control panel. Drawing 20D1030 appears to show the grit system main control panel mounted in an electrical room with a MCC. MCC's are typically provided as NEMA 12. Please confirm if a NEMA 12, painted steel enclosure is acceptable for the grit system main control panel.

This question will be answered in an upcoming amendment.

09N2003 – P&ID details an E-STOP and HOA LCS for the Grit Snail unit but this is not outlined in the spec. Please confirm if a NEMA 7 Local Control Station is required for the Grit Snail.

This question will be answered in an upcoming amendment.

Per 31 23 16 Part 3.01 General Section E, "Use of Explosives is not allowed for excavation". Kiewit has had success with the use of Microblasting for rock which uses a non-explosive demolition method to crack and split hard rock from the inside.

This process entails drilling a small diameter hole into the rock using a drill bit, inserting fast-burning gas-producing cartridge and a primer into the hole, placing the MicroBlaster device directly on top of the charge, and finally firing the system using a remote pull cord or an air/CO2 pressure pulse which generates up to 75,000 psi of internal gas pressure to fracture the rock safely. This non-invasive method of rock fracturing will not cause flying debris or seismic / vibration issues against the existing structures. Kiewit plans on developing a microblasting plan with Aimone-Martin Associates, LLC to ensure no damage to existing structures will happen. Please provide concurrence this method is acceptable.

This question will be answered in an upcoming amendment.

Specification Section 01 11 00, Paragraph 1.3.A states that each phase shall be substantially complete before beginning the next phase unless otherwise approved by the Contracting Officer. Paragraph 1.3.C includes the 12-month operation and maintenance of the new treatment facilities as part of Phase 1.

Section 01 78 25, Paragraph 1.01.A states that the 12-month O&M period begins following Government assumption of Beneficial Occupancy of Phase 1.

Please confirm whether Phase 2 may commence following Government acceptance/Beneficial Occupancy of the new Phase 1 treatment facilities and transition of wastewater treatment to the new facilities, while the 12-month O&M period continues concurrently.

If Phase 2 may not commence until completion of the full 12-month O&M period, please confirm.

This question will be answered in an upcoming amendment.

Plan Sheet 32S3001 references Specification Section 07 12 53 for elastomeric sheet waterproofing underneath slabs on grade. However, this specification was not included in Addendum 1. Please provide Specification Section 07 12 53.

Specification Section 01 11 00, Paragraph 1.3.B requires the Contractor to construct the minimum improvements to the existing two-track road. The specification further indicates that this work is to be completed prior to the start of the construction phases.

The Access Road cross sections shown in the Contract Drawings indicate approximately 4 inches of aggregate base and 4 inches of asphalt concrete pavement.

Given the anticipated construction traffic over the approximately three-year construction duration, including concrete trucks, heavy haul trucks, process equipment delivery vehicles, and other construction traffic, the required pavement section may be subject to deterioration prior to completion of the Project.

Please confirm that the intent of the Contract Documents is for the asphalt concrete pavement identified in the Access Road cross sections to be installed at the beginning of the Project and used as the primary construction access route throughout construction knowing there may be damage caused to the pavement.

If damage is a concern, please consider one of the following two options:

1. Place Cement Treated Base (CTB) at the beginning of the project and then provide the required asphalt pavement section at the end.

2. Provide an allowance or bid item for end-of-project pavement restoration, including grinding and overlay of the access road, to be utilized at the discretion of the National Park Service based on the condition of the roadway at the completion of construction.

This question will be answered in an upcoming amendment.

Section 01 78 25 Section 1.06 – Materials and Equipment; A.) Materials and Equipment are excluded from the contract.

Section 1.10 – Consumables; B.) 1.) Contractor will supply treatment chemicals for wastewater treatment operation.

Will the Government confirm which specific materials and in what quantity are to be provided by the contractor?

This question will be answered in an upcoming amendment.

Section 01 78 25 Section 1.03 – Are there maximum number of hours per shift for operators?

Section 1.02 B.) – What is the purpose of submitting a minimum of two qualified resumes for each position? What qualifications are required of the operators other than those listed in the Supplement under Section 1.18?