Questions and Answers to Project Documents — Business Opportunities
PROJECT:  Concourse A and C Pre-Conditioned Air Re-Life
NUMBER:  201951778-00

Current as of:  6/2/2020
Question Number  1:   In reference to specification section 230923.2.1.A DDC System Manufacturers. Confirm that Johnson Controls, Inc. is an approved equal to the Basis of Design Product.
    Answer:   Honeywell and Johnson Controls are approved equals to the listed Basis of Design manufacturer ALC (see Addendum 3 Spec 230923).
Question Number  2:   Re: 2.23 D. LAN and Communication Cable: Do you have a specific floor plan for the Communications Plan LAN Cabling?
    Answer:   There is no specific floor plan for communications and LAN cabling, This needs to be provided by the Controls Contractor.
Question Number  3:   (Re: Baggage Handling System A003) The referenced sheet indicates to "remove the baggage system as required and stockpile for reinstallation." It further indicates to "reinstall baggage system to original condition." 1 - This system is currently inoperable. What is considered original condition to be installed? 2 - Is it acceptable to simply remove portions of this equipment and preserve the Right of Way for future installations? What is the best way or structure to preserve the right of way?
    Answer:   Contractor is to reinstall only beams and hangers. Other mechanical type equipment on the system can be left off and disposal coordinated with DEN.
Question Number  4:   (Re: Geotechnical Report Section 316329.10) The referenced specification section indicates "The geotechnical report is included elsewhere in the Project Manual." A search of the documents indicated this document was not included. Please provide a copy of the Geotechnical Report.
    Answer:   The geotechnical report can be found in Addendum 2, and the addendum to that report can be found with Addendum 3.
Question Number  5:   (Re: Micro Pier Required Lengths S001) Detail 1 "Typical Micro pile Design Information" on the referenced sheet indicates a required minimum length of bedrock penetration and a required bond length into bedrock. These lengths are not indicated in the documents. Please provide the minimum lengths for both the penetration and required bond.
    Answer:   The required micropile lengths and bedrock penetration are determined by the required load capacity indicated on the plans and the grout to ground bond values in the geotechnical report (see addendum), along with the in-situ conditions.
Question Number  6:   (Re: Micro Pier Pricing) The referenced document indicates the Earthwork Quantity as a "Lump Sum". This is sufficient for the excavation portion of this scope, however Micro Piers are quoted and installed by the "Lineal Foot". Would DEN consider adding another pricing section which addresses Micro Pier Installation by the Lineal Foot (LF)?
    Answer:   Micropile bidding assumptions: Based upon the limited soil borings at the project locations, bedrock elevation varies from 1.5 ft. to 25+ ft. below the existing slab level. For bidding purposes assume top of bedrock elevation to be 25 ft. below existing slab level. Micropiles to be 6” minimum diameter with a 40’ minimum length and 15’ minimum penetration into bedrock. There are a total of 69 micropiles in Concourse A and 50 micropiles in Concourse C. Due to the existing field conditions noted in the soils report, actual field conditions will vary during construction. The Contractor shall follow all required design information listed on the drawings and in the specifications. Bid tabs will be updated with the next addendum.
Question Number  7:   "(Re: Staged Construction Plan S201) The referenced plan indicates the contractor to ""Provide continued support of the existing basement walls"" as indicated. What load is anticipated for the continued support of the walls indicated?"
    Answer:   Support for the basement walls are provided by the staged demolition and construction of the concrete floor system. The intent of this note is to ensure that the contractor does not demo, remove, and replace larger sections of the existing floor than is indicated in the staged construction plan.
Question Number  8:   (Re: Concrete and Dirt Disposal AD101) Other DEN projects have provided dump locations for Clean Concrete and Excavated Soils. Please provide locations where this material can be disposed of on site.
    Answer:   The concrete may be deposited in either the north or south concrete recycle yards, once you are ready to deliver let Ken Pavlick know and he can give you a dump location within the yard. As for the dirt, it can be dumped behind the Pikes Peak lot in the soil depository area, again once you are ready to deliver, Ken will give you a location.
Question Number  9:   "Overhead doors shown on sheet A301 have card readers called out. No details regarding security requirements are outlined in the specifications. Please provide a specification section outlining the security requirements for the overhead doors."
    Answer:   There will be no card readers for the overhead doors. Intellikey locks will be installed. See revised Door Schedule sheets (listed as Miscellaneous 1 at
Question Number  10:   There are no details regarding the paint to be applied on the new housekeeping pads. Please provide details of the paint to be applied to housekeeping pads, specifically if a yellow visibility stripe or any other coating will be required for these housekeeping pads.
    Answer:   The house keeping pads will be required to be painted with high performance paint for concrete. See Issue For Construction High Performance Paint Specification 099600.
Question Number  11:   "Are permits required for this project? If yes, what type(s) of permits will be required? How will this be permitted? By room location or by project? Are the fees paid by DEN?"
    Answer:   Standard Architectural, Structural, Mechanical, Plumbing and Electrical Permits will be provided. Fire Alarm and ECS will be a deferred submittal provided by the contractor.
Question Number  12:   Per the schedule included in specification section 0132210 the project duration is indicated at 30 months for Concourse A and Concourse C indicates 19 months. In the project manual the completion date in the sample contract is indicated as follows: Conc A PC Chillers = 300 Cal days from NTP. Conc C PC Chiller = 365 Cal days from NTP. Conc A Heat Exchangers = 730 Cal days from NTP Conc C Heat Exchangers = 548 Cal days from NTP. In section SC-7 of that same manual the CCA Heat exchangers substantial completion is indicated at 548 Cal days from NTP Please clarify the schedule and milestone durations that the bidders are to schedule to.
    Answer:   Please review IFB documents for correct durations. Conc A PC Air is 300 Days, Conc C PC Air is 365 days, Conc A Hx is 548 days, and Conc C Hx is 548 days.
Question Number  13:   Are general dumpsters provided by DEN for General construction trash? If yes where are they located? If not provided by DEN where is a location that dumpsters can be set by the contractors?
    Answer:   General dumpsters are provided by DEN. Location to be determined during pre-construction coordination.
Question Number  14:   Where is the closest existing bathroom that will be available to contractors for each location of work as indicated in the documents?
    Answer:   Restrooms are located in the center core East on both the Concourse and Apron levels.
Question Number  15:   What are the traffic control and flagging requirements for the project?
    Answer:   Please refer to DEN Specifications for full requirements.
Question Number  16:   Please define free cooling dates for this project.
    Answer:   DEN will usually disable mechanical cooling in the PCA plants in mid October and put the PCA system into heat mode. The plant will stay in that mode of operation  until about the 1st of April, depending on weather, then, return to mechanical cooling and disable the heat system. These are not hard dates. Specific timing in relation to this project will have to be coordinated with DEN Operations and Maintenance. 
Question Number  17:   Please provide the CAD file/Model.
    Answer:   Revit/CAD files can be provided after a Contractor has been selected
Question Number  18:   For temporary walls that impact the traffic lanes, who is responsible for revised striping, signage, road re-alignment, and traffic control? i.e. temporary wall construction in traffic lanes.
    Answer:   The Contractor is responsible for adjustments and for the return to original traffic layout. They would also be responsible for traffic control as needed during construction.
Question Number  19:   Please provide the date when DEN will issue NTP.
    Answer:   The precise date of the Notice to Proceed is not known at this time because the procurement must be completed, final contract drafted, bonds obtained, and all required approvals and signatures obtained. DEN would like to move as quickly as possible.
Question Number  20:   Please provide an overlay of the building above the rooms.
    Answer:   See referenced sheets in Miscellaneous 1 link at
Question Number  21:   During the pre-bid meeting it was indicated that DEN's plan for concrete access would be down the adjacent ramps to the room. Please provide additional detail on what DEN's plan is.
    Answer:   Contractor is responsible for means and methods of all construction activities. DEN to coordinate stakeholder engagement and system/traffic shutdowns as needed.
Question Number  22:   Please confirm that there are no utilities below the existing rooms.
    Answer:   The known plumbing lines are indicated on AD101, there are no known as-built drawings to indicate existing utilities in this area. Contractor is responsible to verify existing utilities.
Question Number  23:   How would DEN like bidders to handle temporary protection during construction from the existing wall and roof leaks?
    Answer:   Contractor is responsible for the defined scope of work. Any existing conditions are to be documented and submitted formally.
Question Number  24:   Has DEN completed a mold and hazardous material survey for all construction areas, if so please provide.
    Answer:   At this time, no environmental assessment has been completed. If abatement is necessary, a specific course of action can be discussed.
Question Number  25:   "Note 19 on A003 states that temporary pads are required for relocated tanks, the existing tanks are not sitting on a pad. Are the pads required?"
    Answer:   Temporary pads are required.
Question Number  26:   Is DEN monitoring the exterior foundation wall for movement during construction?
    Answer:   Monitoring of the exterior walls is not anticipated. Contractor shall follow staged construction plan as outlined on sheet S201 to provide support for base of foundation walls.
Question Number  27:   Does DEN have an initial report on the exterior foundation wall regarding any movement? If so, please provide.
    Answer:   There is no report on foundation wall movement.
Question Number  28:   Please define fireproofing scope and specifications.
    Answer:   The fireproofing scope is for patching disturbed areas due to new construction.
Question Number  29:   Should the contractor carry an allowance for fireproofing repairs? If so, how much.
    Answer:   Yes, an allowance of $30,000 is to be included on a separate line of your bids for fire proofing and fire penetrations. All allowances will need to follow the requirements in the Division 1 specification for payment. This will be addressed with a revised bid tab in the next addendum.
Question Number  30:   "In Concourse C there appears to be a structural member that is rusted, has the structure above in both locations been validated by DEN as safe to work below."
    Answer:   DEN has not conducted a structural evaluation of the overhead structure in the plants. Contractor is responsible for surveying existing conditions and providing in the form of a submittal.
Question Number  31:   Please provide a connection detail for the piping going to the pump rooms.
    Answer:   See link labeled Miscellaneous 1 at
Question Number  32:   "It appears that in Concourse C an existing AHU, ductwork, electrical disconnects, plumbing, piping, and related services for the unit is in the location the temporary wall is to be constructed. Please provide direction on how DEN would like contractor to construct the temporary wall in this location."
    Answer:   The temporary wall construction will be sufficient. Contractor to use typical means and methods.
Question Number  33:   Please provide specification sections for 078100 - "Applied Fireproofing" and 078413 - "Penetration Firestopping"
    Answer:   See Addendum 2.
Question Number  34:   Can you tell me if you are going to post the list of individuals who attended the pre-bid conference and mandatory guided site tour on Wed., March 11, 2020?
    Answer:   This has now been posted on the IFB project page for this project at
Question Number  35:   Are there work hour restrictions for this contract? If so, I could not locate them.
    Answer:   There are no work hour restrictions, but work hours need to be coordinated with DEN during pre-construction and throughout the duration of construction. Activities that affect vendors and stakeholders may have limitations.
Question Number  36:   In response to the current COVID-19 events, can you please confirm if the timeline of this bid submission will remain March 26th or if it will be extended?
    Answer:   See Addendum 3.
Question Number  37:   (We are) a company based in Mumbai, India. We are interested in participating in the tender mentioned above hence want to get more information about the same. Considering the geographical constraint of personally reviewing the document, I request you to provide us the following details before we buy the document: 1) List of Items, Schedule of Requirements, Scope of Work, Terms of Reference, Bill of Materials required. 2) Soft Copy of the Tender Document through email. 3) Names of countries that will be eligible to participate in this tender. 4) Information about the Tendering Procedure and Guidelines. 5) Estimated Budget for this Purchase. 6) Any Extension of Bidding Deadline? 7) Any Addendum or Pre Bid meeting Minutes? We will submit our offer for the same if the goods or services required fall within our purview.
    Answer:   We are not selling the project documents. All of the project documents can be found on the project page for this project at That said, this is a construction project, and we are requesting bids for construction to be performed in Denver, Colorado, United States.
Question Number  38:   Please provide the Soils Report No. 18-1-409 by Kumar and Associates dated June 25, 2018 as well as the report Addendum letter dated March 1, 2019.
    Answer:   See response to Question 4.
Question Number  39:   We will be submitting our questions on Thursday as requested, but wanted to ask as soon as possible if there will be additional times available to walk the site with subcontractors. This is a unique project and logistics are obviously a key component and it would be helpful to be able to walk the site with our concrete subcontractors to ensure the most accurate pricing. Please let me know if this is possible.
    Answer:   DEN performed a site walk following the pre-bid meeting on March 11, 2020, to allow all of the Contractors to see the work space and ask any questions of the project team. Since that site walk, DEN employees have since been told to work from home and to avoid meetings unless absolutely critical. Unfortunately, the current situation does not allow us to provide additional site walks.
Question Number  40:   Can you tell me what the warranty period is for this contract? Our insurance company needs it for the bid bond.
    Answer:   As stated in specification 017835 3.1.A, the general construction warranty is defined by the City of Denver’s General Contract Conditions, 2011 Edition. Additional product warranty requirements are outlined by individual specification.
Question Number  41:   Will there be additional times available to walk the site with subcontractors? This is a unique project and logistics are obviously a key component and it would be helpful to be able to walk the site with our concrete subcontractors to ensure the most accurate pricing. Please let me know if this is possible.
    Answer:   See response to Question 39.
Question Number  42:   Is a dedicated Safety Manager required by Contractor, or can this responsibility be addressed with the Contractor's Superintendent or Project Engineer?
    Answer:   A dedicated safety manager is required per ROCIP III guidelines, no exceptions.
Question Number  43:   If a dedicated Safety Manager is required, will this be a full time requirement for the duration of the Project?
    Answer:   See response to Question 42.
Question Number  44:   Is a dedicated Quality Manager required by Contractor, or can this responsibility be addressed with the Contractor's Superintendent or Project Engineer?
    Answer:   All requirements can be found at
Question Number  45:   If a dedicated Quality Manager is required, will this be a full time requirement for the duration of the Project?
    Answer:   See response to Question 44.
Question Number  46:   Is the Contractor responsible for providing a Qualified Material Testing Agency for inspections and testing? If so, what scopes of work will require this? (Reference specification 011100 / 1.2 / H / 2, specification 014525, and plan sheet S001 General Note 10.)
    Answer:   Yes, the Contractor shall provide a QMTA. Scope of testing will be required per General note 10 on S001, quality control terms in the specification, and any special inspections noted on the permit.
Question Number  47:   If the Contractor is to provide a Qualified Material Testing Agency, what firms are currently contracted by DEN that would be prohibited from Contractor's use on this Project?
    Answer:   DEN has contracts or subcontracts with the following firms: AECOM, Ground Engineering, Martinez Associates, Civil Technology, LS Gallegos, Shrewsberry, Sunland, Rock Sol, and Atkins.
Question Number  48:   What date is anticipated for the issuance of Notice to Proceed?
    Answer:   See response to Question 19.
Question Number  49:   Plan sheet S001 General Note 4A references Soils Report No. 18-1-409 by Kumar and Associates, Inc. dated June 25, 2018, and a Report Addendum letter dated March 1, 2019. Please provide these documents.
    Answer:   See response to Question 4.
Question Number  50:   Reference Specification 011100 / 1.2 / F. Please clarify the BIM requirements for this project. Is there a BIM Project Execution Plan for this project already developed, and if so can it be provided at this time?
    Answer:   The BIM execution plan will be provided after a Contractor has been selected.
Question Number  51:   Regarding removing and reinstallation of the existing Baggage Handling System, are there any certification requirements (other than welder certifications) that would limit who performs this work, and if so please clarify.
    Answer:   See response to Question 3. No certification are required beyond what is called out in specifications.
Question Number  52:   Volume 1 - Concourse A plan sheet M2.02 indicates detail 6/M3.03. This sheet / detail is not included in the Volume. Please clarify.
    Answer:   Sheet M303 was deleted. Please disregard this reference. Refer to Detail 2 on sheet M301 for additional heat exchanger information. All Special Inspections will be outlined in the Permit & must be followed by the Q.C. team
Question Number  53:   The IFB "Checklist: Required Submittal Forms" does not include Letters of Intent listed under DSBO. Please confirm that Letters of Intent are not required as part of the bid submission requirements.
    Answer:   Per IB-24 Section 1.7. (Page 17), "On or before the third (3rd) working day after bid opening, all of the Bidders are required to submit an executed "Letter of Intent" for each MWBE listed on the Bid Form as a joint venture member, subcontractor, supplier, manufacturer, manufacturers' representative or broker of any tier." Therefore Letters of Intent are not required AT bid opening, but must be submitted within the above timeframe to meet DSBO requirements for a responsive bid.
Question Number  54:   Is this project utilizing any Federal funding?
    Answer:   (Response pending)
Question Number  55:   Is this project to be compliant with Federal Acquisition Regulation?
    Answer:   Prevailing wages shall apply, as well as Buy American rules.
Question Number  56:   Under "Rules and Regulations Regarding Equal Employment Opportunity" within the IFB sample contract, please confirm the following are not included in this project: Regulation No. 10 Appendices B, C, & D and Regulation No. 12 Appendix E.
    Answer:   (Response pending)
Question Number  57:   Due to the COVID-19 situation, will the bid submission due date be extended? Will the bid Questions & Answer period by extended?
    Answer:   See response to Question 36.
Question Number  58:   Due to the COVID-19 situation, please confirm if bid submissions are to still be hand delivered to DEN or if an electronic submission will be utilized.
    Answer:   See response to Question 36.
Question Number  59:   Per Volume 1 & 2 plan detail 1/S001, please provide the minimum overall length of micropiles and minimum required bond length into bedrock.
    Answer:   The required micropile lengths and bedrock penetration are determined by the required load capacity indicated on the plans and the grout to ground bond values in the geotechnical report (see addendum letter). Location of bedrock varies and must be field verfied.
Question Number  60:   Specification 316329.10 / 1.3 references unit rates for micropiles. Please clarify if this scope of work is to be bid lump sum based on the quantities provided in the bid documents. If a unit rate is to be included for any over/underrruns on actual quantities, is the unit rate to be included in the bid submission, or will it be established during the construction phase if needed?
    Answer:   See response to Question 6.
Question Number  61:   Within Technical Specifications Section 316329.10 – Drilled Concrete Micropiles accounts for multiple items that call out standard practices to Drilled Shaft which do not directly correlate to Micropiles (i.e. Micropiles are not End Bearing, rebar cages are not required for micropiles, surface water can enter the borehole since tremie grouting method will be used, etc.). Please confirm that the micropile scope of work will follow industry standard practices such as stated within FHWA NHI-05-039 Micropile Design and Construction or will rely on guidance from the Micropile Engineer-of-Record.
    Answer:   Micropile installation, construction, verification, and load testing may be at the direction of the micropile engineer of record as long as it follows industry standards.
Question Number  62:   Within Technical Specifications Section 316329.10 – Drilled Concrete Micropiles, 1.9 Trial Micropile; it calls out the requirement of what seems to be a demonstration of means and methods. Is this a requirement that the contractors need to include or is this of the direction of what the micropile industry calls a Verification Load Test? If it is a verification load test that is typically a sacrificial micropile that is tested to 200% the design load. Please keep in mind that with limited access projects this can be a challenge to properly setup the test beams required to perform the verification load test within close proximity to the production micropiles. If this is unknown at this time can it be at the direction of the Micropile Engineer-of-Record?
    Answer:   See response to Question 61.
Question Number  63:   On page 4 of the RFP, under the “Checklist: Required Submittal Forms”, Bid Data Forms, second bullet says we need to submit a “List of Proposed Subcontractors Which Are Not MWBE Subcontractors”, but the actual form says, “o List of Proposed Subcontractors Which Are Not DBE Subcontractors”
    Answer:   (This response will be updated. Original DBE reference were inadvertent, but the goal for this project will likely be changing.)
Question Number  64:   Please confirm that the Dead and Live Loads indicated on the Foundation Plan Drawings are only in Compressive and that there are no tension or lateral loads to consider for the micropiles.
    Answer:   There are no design tension or lateral loads for the micropiles.
Question Number  65:   Please provide the following micropile design loads: Drawing S201 Foundation Plan: A1) Along column lines S7.9 and S5.9 (B4 GradeBeam), total of six micropiles; A2) Single micropile at approximately S6 and E.9; and B) Drawing S202 Foundation Plan: Single micropile at approximately S6 and E.9.
    Answer:   A1) Use design loads as indicated for type B5 concrete beams (grid S7.4). A2) 6k DL : 18k LL A3) 6k DL : 18k LL.
Question Number  66:   Please confirm if the penetration firestopping and fire-resistive joint systems (if applicable) scope of work, will not require to be performed by a firm approved by FM Global and / or an Evaluation by UL identifying compliance with "Qualified Firestop Contractor Program Requirements."
    Answer:   All fire-resistive system installations must be inspected by a qualified inspector, of which their qualifications are a required submittal. See Specification 078100 from Addendum 2.
Question Number  67:   Due to the fire rated wall removal & temporary wall installed, will a fire watch be required during the duration of construction?
    Answer:   There are no new fire rated walls on this project. The Mechanical tie-in in Concourse A may have existing fire rated walls. Contractor to verify. No fire watch is expected.
Question Number  68:   Can the fire alarm system be deactivated for the zone/area where construction operations will be performed?
    Answer:   Existing fire alarm system can be deactivated for the zone/area, but must be requested and approved by DEN Life Safety. Temporary fire alarm and ECS system need to be provided during construction as per DEN standards.
Question Number  69:   Rooms have numerous existing water leaks throughout – please confirm acknowledgement of this and that addressing these leaks will not be included in scope of work.
    Answer:   See response to Question 23.
Question Number  70:   Due to areas of existing construction with aforementioned leaks, it appears there may be mold mitigation required. Please confirm scope of work &/or if there is a mold mitigation plan in place.
    Answer:   See response to Question 24.
Question Number  71:   Will you be providing a staging area outside of the work area for equipment?
    Answer:   There are staging areas inticated on sheets on CCA A003 and CCC A003A.
Question Number  72:   Is there a designated staging area for concrete operations on the apron (i.e. concrete trucks and pumps?)
    Answer:   This will be discussed in the pre-construction meeting.
Question Number  73:   Can construction of both A & C occur simultaneously?
    Answer:   Yes.
Question Number  74:   Are there any noise restrictions during work hours?
    Answer:   Please refer to DEN Specifications for full requirements and restrictions.
Question Number  75:   Are there any work hour restrictions?
    Answer:   See response to Question 35.
Question Number  76:   Is 3 phase, 480 temporary power available in the areas of work?
    Answer:   There is a 480V/3PH panel located in the space but two existing PCA chillers are connected to that panel and there isn't any space left for temporary 480V/3PH power. If temporary power is needed, E.C. needs to verify existing electrical room 0186. This is the closest electrical room from the space. The room is located northeast of the work space, by the elevator.
Question Number  77:   Under article IX milestones, concourse A heat exchangers are 730 calendar days from NTP and concourse C are 548 from NTP. Under SC-7 milestones, CCA and CCC are shown to be 548 days – please clarify.
    Answer:   See response to Question 12.
Question Number  78:   Due to the corona virus pandemic, is there any intent to push the bid date of this project?
    Answer:   See response to Question 36.
Question Number  79:   With the current corona virus pandemic, will there be any additional requirements for construction or procedural protocols implemented?
    Answer:   See response to Question 36.
Question Number  80:   Who will be responsible for pumping down the glycol system? Does DEN handle this or is there a proprietary contractor that does this? If this is the contractor’s responsibility is there a glycol storage to be used for this project, and where is it located in relation to the rooms?
    Answer:   The contractors will be responsible for removal of glycol and for recharging the system when complete.
Question Number  81:   On the North side of the room in Concourse C, some duct hangers have been recently installed. They are located inside of the perimeter of the temporary wall shown on the drawings. How would DEN like this conflict handled?
    Answer:   Contractor to plan to install temp wall as if hangers are not present.
Question Number  82:   Please provide the existing floor slab thickness.
    Answer:   Per the original design drawings, the slab thickness is 5". Contractor to verify.
Question Number  83:   Please provide the existing equipment pad thickness.
    Answer:   Pad thicknesses are not known and should be field verified.
Question Number  84:   Please provide the load testing that will be required for the micropiles (number required and installation location(s)).
    Answer:   See response to Question 61.
Question Number  85:   There appear to be some loads missing for the micropiles on the foundation plan sheets. Several locations note typical load per beam type, but it seems there are still some missing. Please provide.
    Answer:   Please specify missing load locations. See also question #65 above.
Question Number  86:   Please confirm that propane powered equipment is not allowed to be used on this project.
    Answer:   Confirmed.
Question Number  87:   Please note the location of the nearest natural gas filling area.
    Answer:   Nearest public station is on rental car row at 24000 E 78th Ave, Denver, CO 80249. There are also 4 on airport property that are used by the airline partners, one on each concourse and one just to the south of the Signature facility. Use of the airfield options would have to be coordinated directly with Clean Energy by the Contractor.
Question Number  88:   The mechanical equipment schedule on Sheet E401 calls out the chillers as CCA_00_5E_C_S_01-08. The power plan on sheet E301 and Mechanical Schedule on sheet M601 call out the chillers as CCA_00_4C_C_S_01-08. Please confirm that these are the same chillers despite the different naming convention.
    Answer:   Yes, they are the same chillers.
Question Number  89:   The mechanical equipment schedule on Sheet E401 calls out the chillers as CCC_00_3E_C_S_01-08. The power plan on sheet E301 and Mechanical Schedule on sheet M601 call out the chillers as CCC_00_4C_C_S_01-08. Please confirm that these are the same chillers despite the different naming convention.
    Answer:   See response to Question 88.
Question Number  90:   There are no specifications for the VFD's. Is Yaskawa an acceptable option?
    Answer:   Please see VFD Specification 262293 in Addendum 3.
Question Number  91:   There is no manufacturer listed for the glycol feeder. Is Calcium Control an acceptable option?
    Answer:   If no manufacturer is listed, selection must meet the performance listed in the specification and formally submitted to DEN for approval.
Question Number  92:   There are no specifications for the Balance Valves. Is Griswold and acceptable option?
    Answer:   No balancing valves are shown in our plans. No need for an approved vendor.
Question Number  93:   The pump schedule on Sheet M601 for Concourse A shows five (5) glycol pumps. The Pre-Conditioned Air Room Plan on sheet M401 shows four (4) glycol pumps. Which is correct?
    Answer:   There are four (4) of each type of pump. Note that the "5th" pump is a duplicate number. This is a Revit glitch and should be ignored.
Question Number  94:   The air separator shown on Sheet M601 shows a 10" model number, but shows a 12" inlet/outlet size. Which is correct?
    Answer:   Correct, 12" connections. It's located in a 12" pipe.
Question Number  95:   Specification Section 079200 – Joint Sealants subsection 1.11.B.1 states the products are to have a (20) manufacturer warranty. The products outlined in Part 2 of section 079200 only come with (5) year manufacturer warranties, not (20) year warranties.
    Answer:   DEN standard specification indicates 20 years.
Question Number  96:   Confirm that it is acceptable to use joint sealant products with five (5) year manufacturer warranties."
    Answer:   See response to Question 95.
Question Number  97:   Due to the COVID-19 outbreak and the resulting precautionary measures being taken across the country, the bidding community has had a significant strain on the ability of all interested parties to accurately prepare our bids. The ability of all bidders to effectively collaborate with their trade partners, exchange information, understand the current supply chain situation, formalize project delivery plans, define scope obligations across parties, and of course finalize the bid price as been hindered at best. These constraints are impacting all bidders and their respective team members. This situation and the limited amount of time remaining to compile bid submissions could result in less than well thought out bids and/or subsequent problems arising during project delivery. Please consider this current business and social environment and extend the bid date by a minimum of two (2) weeks.
    Answer:   We recognize that COVID-19 is impacting the ability for contractors to formalize quality bids. At this time, we will be delaying bid opening to a date that will be announced in the upcoming addendum for this project.
Question Number  98:   What does the functionality of the system need to be during the work?
    Answer:   The appropriate seasonal system must remain operational. Heating in the winter, cooling in the summer.
Question Number  99:   The pump schedule shows 5 PCA Glycol pumps, is this a typo and should there actually be 4?
    Answer:   See response to Question 93.
Question Number  100:   The air separator shows 10” model number, but a 12” inlet/ outlet, which is correct?
    Answer:   See response to Question 94.