Questions and Answers to Project Documents — Business Opportunities
PROJECT:  Central Utility Plant (CUP) R-22 Replacement
NUMBER:  201734839-00

Current as of:  9/22/2017
Question Number  1:   Specification section 230923 Direct Digital Controls Part 2 Products 2.1 Manufacturers A. Basis of Design.  The existing CUP DDC system is Johnson Controls Metasys.  Confirm that the new DDC system for the chiller replacement project is to be Johnson Controls.  Please confirm that this should be added to the specification as the basis of design as the existing CUP front end system.  Confirm that all temperature control systems and instrumentation for the new chillers along with the existing chillers is to be connected to the existing Johnson Controls Metasys CUP system.    
    Answer:   It is confirmed that the new DDC system shall be Johnson Controls and shall connect into the existing Johnson Controls Metasys CUP System.
Question Number  2:   Specification section 236416 Part 2.1A lists Carrier as an acceptable vendor.  Part 2.4 A1 lists R-123 as the only refrigerant.  Carrier chillers utilize a positive pressure refrigerant; HFC-134a.  Please confirm HFC-134a is acceptable for this project.
    Answer:   No, HFC-134a is not acceptable for this project.
Question Number  3:   Specification section 236416 2.9A states the VFD shall be factory mounted.  Please confirm the VFD is to be a free standing medium voltage VFD as shown on the plan drawings.
    Answer:   Free-standing, medium-voltage VFDa are correct per the plans. Updates to the specifications will be issued in the conformed set of contract documents issued at the award of contract.
Question Number  4:   Specification section 236416 2.3D requires an open drive motor.  Please confirm that a hermetic motor design is acceptable.
    Answer:   A hermetic motor design is preferred. Updates to the specifications will be issued in the conformed set of contract documents issued at the award of contract.
Question Number  5:   Can the prime contractor be a mechanical prime with a 2(A) general contractor on the team?
    Answer:   No.
Question Number  6:   What are requirements for the old chillers and pumps after removed from CUP (demo, scrap or DEN required storage)?
    Answer:   Plant personnel may want to scavenge the equipment to be demolished and removed for parts, and this effort will be required to be coordinated with the DEN Construction Project Manager. Any remaining parts of that equipment shall be scrapped by the contractor.
Question Number  7:   On drawing M4.09 item 2.e  states that the plant shall be capable of running in the optimum energy mode (OE).  It states that this work is furnished under a separate contract.  Confirm that this project will provide the programming and commissioning without the OE work and that work will be performed after the completion of this project.  Confirm that the control contractor shall exclude the work related to this sequence of operation since it is not defined. 
    Answer:   Programming and commissioning under this contract does NOT include a revitilization or recommissioning of the OE system.
Question Number  8:   Confirm the following:  General note 1 on drawing M.11 states that the RTU shall be furnished with factory packaged controls and not field installed controls.  The RTU shall be furnished with a BACnet interface for connection of the RTU to the EMCS.  The note states that the EMCS contractor is to coordinate with the RTU controls to accomplish the sequence of operation.  The sequence of operation is the responsibility of the RTU supplier because they are furnishing the factory packaged controls.  The EMCS contractor shall be responsible to connect the CUP EMCS to the BACnet communications card and read/write to the RTU control points allowed by the RTU manufacturer.  RTU factory packaged controls cannot be modified by the EMCS contractor due to violation of RTU equipment warranty and the inability of EMCS contractor to change the sequences that are provided with these factory packaged controls. The EMCS contractor is limited to read, write, and adjust RTU only the control points based allowed by the RTU manufacturer.  The RTU controls start-up must be furnished by RTU equipment supplier. 
    Answer:   Correct, however it remains in the contractor's team's responsibility to ensure the overall control sequence can be accomplished or an RFI must be provided to describe any conflicts with the design intent.
Question Number  9:   For control equipment IP connections that require a structured cable (Cat 6 ), confirm that DEN will provide the equipment and technical work to connect the equipment to the DEN data network. Provide a quantity of IP connections and a central location in the CUP for these points of connection. 
    Answer:   DEN does not anticipate any IP connections on the specified equipment. Local BACNet MSTP cards are intended to be provided with each chiller.
Question Number  10:   Confirm that each VFD shall furnished with a BACnet MSTP open protocol communications card by the VFD manufacturer.   
    Answer:   Yes.
Question Number  11:   Confirm that each chiller shall furnished with a BACnet IP open protocol communications card by the chiller manufacturer.
    Answer:   No. BACNet MSTP cards are the intent to allow direct connection to the field I/O panels.
Question Number  12:   Confirm that each flow meter shall furnished with a BACnet IP open protocol communications card by the flow meter manufacturer.
    Answer:   No. Despite the note on the flow meter schedule on M602, BACNet MSTP cards are the intent to allow direct connection to the field I/O panels.
Question Number  13:   Confirm that each packaged roof top unit shall furnished with a BACnet MSTP open protocol communications card by the RTU manufacturer.
    Answer:   BACNet MSTP is the intent for RTU communications - DEN cannot determine the scope assignment. The RTU specification calls for a BACNet compatible interface.
Question Number  14:   Please confirm that the Electrical Contractor not the pump or AHU supplier is to furnish the VFD for pumps. See sheet E1.02 note #3 and E6.07 note #3
    Answer:   The design intent was to specify and provide VFDs under division 26. However, scope assignments are ultimately the responsibility of the GC.
Question Number  15:   Please clarify that all medium voltage raceways are to be GRC. The specification call for an approved raceway. (Section 260513 part 3.1  line I) Is any other Raceway type considered Approved?
    Answer:   The medium voltage raceways are intended to be only GRC or busduct.
Question Number  16:   Can raceway and cable be used instead of Buss Duct. To feed HGMC-C?
    Answer:   No. Due to space constraints and the bending radius required for conduit/cable, busduct shall be used. The feeder is required to be very tight to the structure and shall not interfere with other equipment, roof access, etc.
Question Number  17:   Please confirm that the Johnson Control is to quote separate to the electrical contractor the reconnection and reconfigure of associated  controls  of chiller #3 to chiller #1. This shows up in a note on E1.01 note #11. This is not common and would be part of their quote to Mechanical Contractors.
    Answer:   It is acceptable to include the chiller controls reconfiguration from chiller #3 to #1 in the overall controls quote. It is not required to separately quote the work through the electrical subcontractor. Scope assignments and coordination between trades is utimately the responsibility of the GC.
Question Number  18:   23 05 48 P-5 Calls for inertia bases under pumps.  Most of the new pumps are turbine pumps that would not normally be set on inertia bases.  The existing pumps are not on inertia bases.  Which new pumps are expected to receive inertia bases?
    Answer:   Base mounted pumps shall receive inertia bases - the new chilled water distribution pumps (P-12) and the AHU booster pumps (P-17A, P-17B). Vertical turbine pumps will not receive an inertia base.
Question Number  19:   23 21 13 P-7 Calls for sch. 40 pipe on condenser water and chilled water systems.  Starting at 12” pipe, schedule 40 and std. wt. are not the same thing.  By the time you get to 24” pipe, schedule 40 is almost twice as thick as std. wt.  (.688” vs. .375”).  Is schedule 40 really the intention of the request?
    Answer:   Standard weight piping is allowed for piping 12" and above as it meets the intended pressure requirements.
Question Number  20:   Insulation section 23 07 19 calls for the bottom 10’ of insulation to be jacketed with aluminum.  This is not the same as existing. Does DIA want this on the new installation or like the existing conditions?
    Answer:   DEN would prefer to have all insulation jacketed with color coded PVC. It is DEN's understanding that this is comparable to painting the insulation.
Question Number  21:   The RFP requests that the font used must be Times New Roman font 12pt. Can headers, captions and graphics labeling be in a smaller and or larger font?
    Answer:   All narrative content must be Times New Roman in 12 pt.; however, all other content is permitted be in larger and/or smaller font size.
Question Number  22:   Conduit above Turbine pumps must be temporarily moved to pull existing pumps and install new. (See M3.02)  What does this conduit serve?
    Answer:   Conduits/Piping/Cables above pumps are allowed to be relocated with coordination of what they serve, what equipment/users will require an outage, and approval by the DEN PM. To avoid or minimze conflicts with conduit and piping above, the existing floor slab can be slotted in the E-W direction within the N/S column lines to remove existing Vertical Turbine (VT) pumps and install new pump shafts. Openings in the N/S direction are not permitted due to t-member structure below. Specifications also allow field-assembled VT pumps to further minimize any conflicts and impacts to operations. It is strongly recommended to engage factory-authorized representatives for any field assembly. Based on available information, existing pump shafts can be disassembled in sections. However coordination with openings previously mentioned shall be used at the discretion of the contractor to remove existing pump shafts.
Question Number  23:   Drawings in the Phasing Plan show "New Slide Gates" in the inlet structure for the condenser water sump.  Is any work in the inlet sump a part of this project scope?
    Answer:   Slide gate and sump wall modifications are not included in the scope. The existing sumps must remain in service to support the airport cooling loads. Confined space work coordinating with an active sump will be required associated with vertical turbine pump and drain modification work.
Question Number  24:   On M4.01 & M4.02 there is 1" CS that joins the discharges of the CW pumps. What is its purpose?
    Answer:   This is a chemical sampling line that is intended to route over to the sampling station, and then is routed to the sump for discharge.
Question Number  25:   Chemical treatment is being  "temporarily" relocated to Bay 5.  What will be its final location?  When should that occur?
    Answer:   The phasing plan describes the intent - Phase 4, New Work, note 7. The final locations are currently occupied by base-mounted CW pumps, so the chemical treatment should be relocated once the bay becomes available.
Question Number  26:   In preparing our response we understand the 12pt Times New Roman font requirement to be a minimum requirement. And that for presentation purposes we can make Section Titles, and Exhibit Titles etc. bigger and in Ariel font so long as the text is not smaller than 12pt Times New Roman. Is this a correct assumption?
    Answer:   Please see response to question #21
Question Number  27:   Note #2 on drawing MD4.05 and M4.05 requires that a refrigerant pump out system be available during construction for each type of refrigerant in use. Existing RTU-1 is to be removed during phase 1 of the project leaving only RTU-2 with two different refrigerants in use in the plant. The new RTU-1 is not installed until phase 5 of the project and, is shown to install in the same location vacated by existing RTU-2. With the current phasing, there would be two refrigerants in use but only one RTU from the start of phase 1 through the completion of phase 4. We request further explanation of what seems like a discrepancy.
    Answer:   Consistent with current operations, R-123 is not intended to interact with the existing transfer system or storage vessels. Portable canisters and pump-out equipment will be used for R-123 until later phases when the legacy RTU equipment is removed and the hard pipe system is converted to use with the new chillers and connected into existing chillers 4A/4B.
Question Number  28:   Drawing MD4.05 indicates that the existing refrigerant transfer and equalization piping is to be removed.  Drawing M4.05 shows nearly identical piping installed.  How much of the existing refrigerant transfer and equalization piping can be reused?
    Answer:   Refrigerant transfer and equalization headers are shown to remain and be reused. Generally, existing piping can be reused to the greatest extent possible. However, RTU connection piping must be reworked to accommodate the new refrigerant transfer unit and intent for flexible hosing to portable tanks. Individual bay/branch piping can be reused to some extent, but must be reworked to accommodate new chiller connection, quantity, and location. Dual compressor chillers will require individual connections and isolation valves to each refrigerant circuit.
Question Number  29:   Please provide Specifications for Division 21 - Fire suppression.
    Answer:   Fire protection specification information is included on the drawing sheets.
Question Number  30:   Will epoxy anchors require X-RAY or GPU?
    Answer:   Yes. See specification section 230500.3.4.C.
Question Number  31:   Will DEN require third-party inspection of the epoxy anchors, or will inspections be performed by DEN personnel?
    Answer:   Third-party inspections will not be required for epoxy anchors. DEN QA Staff will inspect the anchor installation.
Question Number  32:   We are respectfully writing to request the addition of subcontractors prequalified with the City and County of Denver in the category of 2(C ) Mechanical be included on the above noted project. As the foremost scope of work on this project will encompass mechanical services, rather than general building services, we are requesting the 2(C ) category at the level of $12,000,000 or above be included as acceptable qualifications for bidding [proposing] as a prime contractor.
    Answer:   No. The requirement stands as stated in the RFP.
Question Number  33:   During the pre-construction question and answer session on August 9th at 9 AM MST at Denver International Airport, it was stated by DIA representative, Ms. Haven Cassidy that refrigerant HCFC-123 is the preferred refrigerant acceptable for the CUP R-22 Replacement RFP # 201734839. It was further noted in the question and answers for the project on July 19th that HFC-134a was not an acceptable refrigerant (See question number 2 at As this is the preferred refrigerant, it is prudent as an equipment manufacturer of these chiller products to inform DIA that this refrigerant has a ban on new chillers manufactured as of December 31st, 2019 and a complete phase out of this refrigerant by 2030 in accordance with the Montreal Protocol agreement. The TRANE Company is the only manufacturer that still uses HCFC-123 in chillers. All other manufacturers of chillers of this size utilize refrigerant HFC-134a, which currently has no phase out scheduled. Allowing only HCFC-123 refrigerant eliminates all competition on the chiller products thereby allowing TRANE as the sole source bidding of chillers for this project. Please advise if this is the intent of DIA to allow only one acceptable supplier of chillers for this project. Is it acceptable to DIA and/or the City of Denver to have this large project sole-sourced by a single manufacturer?
    Answer:   As stated in the RFP documents, all questions asked and answered in the preproposal conference are not official until they are reduced to writing and posted to the RFP website.  The specifications for this contract are performance based, and all vendors are welcome to propose.
Question Number  34:   Request For Proposal section IP-23 indicates that the City may provide a Rolling Owner Controlled Insurance Program (ROCIP). Will a ROCIP be implemented?
    Answer:   Yes, this is a ROCIP project.
Question Number  35:   Are full time Contractor Safety and Quality managers required to be onsite during the entire duration of the project, including the time between phases, only during scheduled activities, or only during work considered “critical”? Please clarify the requirements of these staff to be present onsite during the project
    Answer:   Any time there are work activities on site, a qualified, full-time ROCIP Safety Representative is required. The ROCIP Safety Representative requirements are detailed in the ROCIP Contractor Safety Manual, which link is provided in Exhibit Q of the RFP.
Question Number  36:   Specification 011100 Summary of Work section 1.2 / E indicates that the project will utilize the CM Manager / PCM software. Please clarify the applications that this software will be implemented for, and the overall intent of its use.
    Answer:   DEN no longer uses CM Manager as its project management information system (PMIS). DEN's current PMIS software application is Oracle Primavera Unifier. The software is web based and will be used for all project delivery and change management documentation, including but not limited to submittals and RFIs. Software licenses are supplied by the owner at no cost to the contractor. DEN project control staff will train contractor's personnel on the use of the software.
Question Number  37:   Plan sheet S1.03, Sheet Keynote #1 indicates to see detail 6/S5.05 for removal of existing support beams. Please clarify which beams this Keynote specifically applies to.
    Answer:   Please refer to the "Utility Plan" under "Additional Documents" for this RFP in the Contract Procurement Website at: This is a layout drawing for five structural beams that have been identified to be in conflict with new piping in Chiller Bay #1. Additional steel demolition in Chiller Bay #1 is at the descretion of the Contractor and to be coordinated with the DEN Project Manager.
Question Number  38:   Specification 011400 / 1.4 / B4 indicates a shuttle bus will be provided by DEN. a. What is the drop off / pick up location at the terminal? b. What is the schedule for the bus? Is it on a fixed schedule or on-call awaiting personnel to contact the drivers for drop off / pick up?
    Answer:   a. The pick up location would be one of several bus shelters in the DEN Landside Employee Lot and the drop off location is the Transit Center located on the South side of the Terminal. b. There are several buses making a loop on the route at any given time. The waiting time varies based on the arrival of the employee. The employee would wait longer if they just missed a bus departing from the pickup location. It should also be noted that the rate has changed from $30 per month per employee to $36 per month per employee.
Question Number  39:   "Specification 011400 / 1.4 / B6 indicates that if required the Contractor is to provide a bus and driver to transport personnel between parking and the work site. a. Will the Contractor be required to provide a bus and driver as outlined in this specification? b. Is the transportation allowed to park directly at the CUP facility building? c. What are the requirements for the bus & driver to provide this service?"
    Answer:   a) The contractor is not required to provide a bus and driver, however the contractor must devise a plan to get their employees to the site, as there is not parking available at the Central Utility Plant (CUP). b) As was stated at the pre-proposal conference, there will be no parking for the contractor's staff at the CUP. Contractor-provided transportation is NOT permitted to park at the CUP, but they are allowed to stop to drop off passengers a the CUP. c) Please reference specification section 011430 for all information pertaining to vehicle permitting. Bus size will be limited to Type B or smaller. Driver must be able to obtain a DEN SIDA badge and driving privileges.
Question Number  40:   Can oxygen torches be used in the CUP?
    Answer:   No oxygen torches may be used inside DEN facilities.
Question Number  41:   Does DEN retain all salvage or just certain parts?
    Answer:   DEN will coordinate the delivery of recycling dumpsters for contractor use for all salvageable material. DEN staff has the first right of refusal of all decommissioned equipment.
Question Number  42:   If salvage by DEN is required, where will salvage be taken and stored?
    Answer:   Select equipment might be slated for salvage, DEN Project Management Team will work with the contractor to assess and coordinate. DEN Maintenance staff will remove any wanted parts or equipment prior to removal/demolition. There will be no permanent storage of decommissioned equipment, nor will the material be permitted on airport property.
Question Number  43:   Can the beams inside the building be used for construction purposes, such as for trolleys and lifting? Are there plans that show which beams can be used for construction?
    Answer:   Any and all lifting points must be certified by the contractor for proposed use. DEN Project Management Team can provide record drawings for structural assessment if said drawing are available. Existing lift beams are clearly labeled for use with load information; any other lift point must have a structural analysis completed prior to DEN approving use, at the cost to the contractor.
Question Number  44:   Can concrete go to the recycle yard at DEN? What is the process for that?
    Answer:   Yes, concrete can be recycled at DEN facilities, DEN Project Management Team will facilitate and coordinate disposal.
Question Number  45:   Can DEN provide a copy of the proposal scorecard?
    Answer:   All published information referring to the scoring process is in the RFP documents.
Question Number  46:   Please confirm our understanding is that NEMA 12 Panels are required for this project.
    Answer:   Panelboards are shown on the drawing and the specifications in NEMA type 1 enclosures.
Question Number  47:   Please confirm our understanding is that UPS Power is required for this project.
    Answer:   UPS Power is only required for HGMC-C as a replacement unit for existing.
Question Number  48:   Please confirm our understanding is that Uni-Strut racks are acceptable adjacent to Chillers, Pumps etc.,
    Answer:   Uni-strut racks are acceptable as specified, but not for support of hydronic piping.
Question Number  49:   Please clarify the on-site requirement for the Dedicated Quality Control Manager during work being performed. Can this individual be on-site during installation work requiring quality inspections (chillers and piping, etc.), and off-site if the work does not require quality inspections (demolition work, temporary construction measures, etc.)?
    Answer:   Please reference specification section 014510: QC manager must be dedicated and assigned to the project full time.
Question Number  50:   A Quality Management Plan is required to be submitted with our proposal. Please clarify whether this is a sample plan from another project or if it is to be a project specific plan for this CUP pursuit?
    Answer:   The Quality Control Management Plan should be a project-specific plan and should be prepared to the best of the Proposer's ability. DEN acknowledges that Proposers have had limited access to the site prior to the proposal due date.
Question Number  51:   Can a Dedicated Quality Control Manager be a 3rd party or subcontract individual, or must they be an employee of the General Contractor?
    Answer:   The dedicated QC Manager can be a 3rd-party subcontractor but must be managed by the prime contractor as a regular employee.
Question Number  52:   Detail 1/S5.02 shows to drill and epoxy anchor the edges of new concrete pads. This detail does not appear referenced anywhere else. Does this detail apply at all new concrete pads? Please clarify.
    Answer:   There is no intent to have a section cut or called out at each location where this detail occurs. The specified anchorage of new pads to existing floor shall be installed at all new concrete pads.
Question Number  53:   Detail 2/S5.02 provides various thicknesses for the pad: 12” at Chillers, 5 ½” at VFD Units, and 4” at Inertia Bases. This detail does not appear to be referenced anywhere else in the plans. Please clarify the locations where this detail applies.
    Answer:   There is no intent to have a section cut or called out at each location where this detail occurs. The floor plans in the structural drawings clearly show the pad locations and sizes. In addition, contractor should refer to Mechanical Plans for proposed equipment locations in order to quantify equipment pads.
Question Number  54:   Detail 3/S5.02 indicates a note to remove an existing pump pad, and to refer to the demolition plans for locations. This detail is not indicated on the demolition plans. Please clarify the locations where this detail applies.
    Answer:   There is no intent to have a section cut or called out at each location where this detail occurs. The detail is intended to provide guidance on patching and repairing the floor at any location where a pad removal occurs. Contractor should quantify locations based on existing conditions and demo plans.
Question Number  55:   Is it allowable to conduct an additional site inspection for Subcontractors prior to bid? If so, what are the requirements of the process?
    Answer:   No further site inspections will be coordinated by the DEN Project Management Team.
Question Number  56:   The pump spec (232123 - 2.1 & 2.2 - G-2) references section 230513 for the motor requirements, but that section is not included in the spec manual...can you please clarify.
    Answer:   Section 230513, Common Motor Requirements, will be provided via Addendum Number Four (to be posted to the DEN Contract Procurement Website on or about 9/1/17).
Question Number  57:   Pump Suction Fittings - Spec 232116 - 2.3.A - please confirm Pentair/Aurora will be acceptable.
    Answer:   A substitution request may be submitted with the proposals to be reviewed at the time of selection.
Question Number  58:   Tee Strainers - Spec 232116 - 2.6.B - please confirm American Wheatley will be acceptable. (Currently no manufacturers listed)
    Answer:   A substitution request may be submitted with the proposals to be reviewed at the time of selection.
Question Number  59:   Flex Connectors - Spec 232116 - 2.6.C - please confirm American Wheatley will be acceptable. (Currently no manufacturers listed)
    Answer:   A substitution request may be submitted with the proposals to be reviewed at the time of selection.
Question Number  60:   Inertia Bases - Spec 230548 - 2.2.A - please confirm Vibro Acoustics will be acceptable.
    Answer:   A substitution request may be submitted with the proposals to be reviewed at the time of selection.
Question Number  61:   The VFD specs 26 29 23 say specifically that they are for the 4160V VFDs; is there another spec section for 480V VFDs? Or can we just quote the VFDs based the HMax part#s called out on the VFD Schedule on drawing E6.07?
    Answer:   Please refer to Addendum Number Four (to be posted to the DEN Contract Procurement Website on or about 9/1/17). Alternately the H-Max part numbers may be used.
Question Number  62:   Will BIM Modeling be required for the electrical scopes of the project, and if so please provide requirements & specifications?
    Answer:   Yes, the electrical scope will be required to be included in the BIM model. Please reference the DEN Design Standards Manuals on the website for detailed information.
Question Number  63:   Can it be assumed that DIA will be responsible for all Xcel Utility Fees associated to the disconnecting & reconnecting of Transformer C feeding HGMC-C?
    Answer:   Yes, DEN will be responsible for disconnection and reconnection utility transformer fees.
Question Number  64:   Will Coordination Studies be required for this project, and if so please provide specifications and clarify what electrical switchgear, panels, etc. that will require them?
    Answer:   No.
Question Number  65:   Will the project electrical engineer provide the corrective relay settings for the new Feeder Protection Relays, or will these need to be provided via Coordination Studies?
    Answer:   Please refer to Addendum Number Four (to be posted to the DEN Contract Procurement Website on or about 9/1/17), which references Addendum Number One to the drawings and specification section 26 05 73. "Protective devices shall be set based on results of the protective device coordination study."
Question Number  66:   There appears to be no specifications for the new 4160V bus duct, can specifications be provided?
    Answer:   For specifications relative to the new 4160V bus duct, please refer to Addendum Number Four (to be posted to the DEN Contract Procurement Website on or about 9/1/17), which references Addendum Number One to the drawings and specification section 26 25 00.
Question Number  67:   Please clarify what the feeder size is to be for the Feeder Tie between HGMC-B & HGMC-C, Sheet E1.01, Note 1 just references (3) 6” conduits, but no conductor sizes; the one-lines do not show sizing either?
    Answer:   Feeder shall be rated 1200A - three sets of 350MCM MV-105 copper cables with #3/0 copper grounding conductor in three 6" conduits.
Question Number  68:   Please clarify how many Feeder Protection Relays (FPR) are to be installed within HGMC-B to replace the existing motor protection relays; Sheet E6.02 shows (6) new FPR, ((1)for new Eaton Drive Lineup, (1)for P-33 which is to be removed & labeled as spare, & (4) for the existing chillers 4A & 4B), Sheet 5.02 Notes to install only (1) for new Eaton Drive Lineup?
    Answer:   Only one new FRP relay is required for the new Eaton Drive Lineup. The others shown are existing.
Question Number  69:   Specification Section 260513 – Medium-Voltage Cables specifies that MV-105 cabling with a 15KV, 100% insulation rating is to be used, will 5KV or 8KV with 133% insulation be acceptable for use?
    Answer:   Please refer to Addendum Number Four (to be posted to the DEN Contract Procurement Website on or about 9/1/17), which references Addendum Number One to the drawings and specification section 26 05 13.
Question Number  70:   Does the CUP currently have any ECS (Emergency Communication System) speakers in place that will have to be modified along with the Fire Alarm System, and will any new speakers be required to be installed within the new South VFD Electrical Room or the new Service C Electrical Room?
    Answer:   Yes, there is currently an ECS system within the CUP facility. Contractor will be responsible for all code assessments for any potential design changes and permitting for all Fire Alarm and ECS modifications that might be needed due to the Scope of Work.
Question Number  71:   Will roof patching and/or repairs be required after the (6) 6” HGMC-C feeder conduits have been removed from the roof, there was no access to the roof during the site visit to verify existing conditions?
    Answer:   Yes, the contractor will be responsible for the repair of the existing roofing membrane.
Question Number  72:   Will dumpsters be provided by DEN for use on this project? Where will they be allowed to be placed in relation to the CUP?
    Answer:   Contractor will need to provide their own general construction waste dumpster; recycling dumpsters will be provided at no charge to the project. Location of the dumpsters will be coordinated at time of NTP.
Question Number  73:   Section 232123 - Hydronic Pumps, Part 2 - Products, Subsection 2.1 G. 2. refers to Section 230513 "Common Motor Requirements for HVAC Equipment." This section is not provided in the Specifications given for this project. Please provide this section.
    Answer:   For Section 230513, Common Motor Requirements, please refer to Addendum Number Four (to be posted to the DEN Contract Procurement Website on or about 9/1/17), which references Addendum Number One to the drawings and specifications.