Questions and Answers to Project Documents — Business Opportunities
PROJECT:  Gate Apron Rehab and Drainage Improvements (GARDI) - Northwest Quadrant, Concourse B
NUMBER:  201842636-00

Current as of:  2/22/2019
Question Number  1:   Can the bid date be moved to another day of the week? Monday bids are very difficult as they cause the majority of subcontractor and supplier quotes to come in the morning of the bid, versus the day before which would be Sunday. We respectfully request the bid be moved to Wednesday or Thursday of the same week.
    Answer:   This will be addressed in Addendum One.
Question Number  2:   Can the bid date be switched to a day of the week other than Monday? We would like to reiterate the same concerns that were brought up in Question Number 1.
    Answer:   This will be addressed in Addendum One.
Question Number  3:   At the pre-bid meeting it was stated that the LOI’s for MBE/WBE participation are due at bid time. Page 17 of Part 1: Project Requirements (Paragraph 5, Section IB-24 of the Instructions to Bidders) states: “On or before the third (3rd) working day after bid opening, all of the Bidders are required to submit an executed "MBE/WBE Letter of Intent" for each MBE/WBE listed on the Bid Form as a joint venture member, subcontractor, supplier, manufacturer, manufacturers' representative or broker of any tier…” It would be our preference to submit the LOI’s within 3 days after the bid opening due to the difficulty of obtaining LOI”s while completing a bid submittal. Please verify when the LOI’s are due?
    Answer:   IB-24 is correct.  • M/WBE Letters of Intent must be submitted for each firm listed, including an M/WBE member of a JV. LOI’s submitted for M/WBE firms must be consistent with those listed on the proposed bidder’s worksheet at the time of bid opening. The “list of proposed MWBE’s” is required at time of bid and LOI’s are due no later than 3 days following the bid open.
Question Number  4:   Do you have different asphalt mix design requirements for the HMA Road Surfacing on the VSR?
    Answer:   The intent is to use the same asphalt mix design requirements for both the HMA base course on the apron as well as the VSR.
Question Number  5:   I only see 1 gradation table for HMA which appears to be a ¾” mix, will this be used on both the surface paving and the base course paving?
    Answer:   The ¾” mix shall be used for both surface paving and base course paving.
Question Number  6:   Drawings do not indicate any work to be done to UAL OONES/RIDS Apron equipment at each gate.
    Answer:   Correct. RIDS work is outside the scope of this project.
Question Number  7:   Jetbridges have new UAL Ramp WIFI connections and cabling on each bridge not shown on drawings. 
    Answer:   Conduit for referenced cabling has been added per Addendum No.2. The cabling itself is outside the scope of this project.
Question Number  8:   Drawing A-201, General Notes no 1: This item states “Refer to JBT drawings for final dimensions and details on all fixed bridges, passenger loading bridges and supports.” We do not see the JBT drawings in the package issued. Please provide.
    Answer:   Conduit for referenced cabling has been added per Addendum No.2. The cabling itself is outside the scope of this project.
Question Number  9:   What size and type of anchors are required for the rotundas on the passenger boarding bridges. Are they being supplied?
    Answer:   The Contractor will be required to procure the rotunda anchors and install them into the new PCCP pavement. There are 8 fixed walkway spread frames and 8 rotunda spread frames. For bidding purposes; assume 1-1/4” Hilti HAS-E anchor bolts with a depth of 24” at the rotundas. An example spread footing detail is included with Addendum No. 2, for reference for bidding purposes.
Question Number  10:   Are the cleanouts for the SDG Drain Pipe supposed to be priced in item D-701-5.2 Remove and Replace SDG Drain Pipe or item D-705-5.3 Install 6” Underdrain Cleanout?  We could only find 24 cleanouts for the underdrain pipe, but if we add the number of cleanouts required for the SDG pipe we are much closer to the 57 underdrain cleanouts in the schedule of values.
    Answer:   The cleanouts for the SDG Drain pipe are quantified and paid for under Item D-705-5.3.
Question Number  11:   Sheet CD001 – Note 22 states that PCCP removal along the basement wall must be sawn and picked. Is the depth of the existing concrete known and to be provided?
    Answer:   It is anticipated that the depth of the existing GSE apron concrete is approximately 10-12 inches along the basement wall. See Sheets CP105 thru CP108 and Sheet C-301 Detail 5.
Question Number  12:   "Sheet CS502 Detail 1 shows remove and repair distressed concrete and crack repair beyond the limits of the baggage tunnel opening. No quantities or dimensions are given. Is this an informational only detail that will be used and compensated if it is found?"
    Answer:   If required upon exposure of the basement wall during construction activities, this will be paid for under Item P-610-5.2 Repair Basement Wall. The Bid Proposal quantity was estimated at 1-foot wide around each opening for each wall enclosure location.
Question Number  13:   "Sheet CG301 Cross Sections show 3” CTS base repair (18.75 Feet Wide) and references detail 7 on sheet C-301. Is the repair meant to be for existing CTB? The detail on sheet C-301 does not appear to match."
    Answer:   Existing CTS/LTS subgrade repair is anticipated to be required along the last row of panels, adjacent the trench drain in the PCCP panel replacement area. Prior to PCCP panel replacements, existing base repairs shall be made per Note 1 on Detail 7 of Sheet C-301.
Question Number  14:   "Sheet CU109 and CU511 reference removing and replacing a 6 inch PVC drain line. No details or inverts are shown as this drain crosses the basement roof. Can details and inverts be provided?"
    Answer:   Existing inverts are not known at this time, due to lack of available as-built information. Contractor shall coordinate with DEN plumbing during construction to determine exact location and invert elevations of drain line to the baggage tunnel trench drain.
Question Number  15:   "Sheet CU201 for roof drain profiles has SDG manholes with question marks for rim elevations. Can rim elevations be provided?"
    Answer:   Structure rim elevations are available on sheets CU110 thru CU117 and Sheet CU601. RIM elevations will be added to Sheets CU201 thru CU203, and re-issued via Addendum No. 2.
Question Number  16:   "Sheet CU512 Detail 3 shows P-610 utility encasement for crossings. Will the utility owners excavate the existing utilities requiring encasement? Can the locations of the necessary encasements be provided?"
    Answer:   The Contractor will be required to perform all utility line work indicated in the plans, including excavation and line repairs/replacements and encasements. Utility line encasements shall be provided at utility line crossings with less than 18-inch clearance between utility lines, per CU512 Detail 3. Exact profiles for existing utility lines is unknown, due to lack of available as-built information.
Question Number  17:   "Sheet CU515 shows P-153 backfill around the Denver Water piping. Denver Water typically requires flash fill and not flow fill. Has Denver Water confirmed that flow fill per P-153 is acceptable for the pipe zone?"
    Answer:   DOR has confirmed with Denver Water (DWD) that the use of P-153 CLSM in this application is approved by DWD.
Question Number  18:   "Sheet EL101 General Note 1 requires the contractor to replace “ANY GROUNDING LOOP GROUND ROD DAMAGED OR REMOVED DURING CONSTRUCTION TO RESTORE GROUND LOOP CONTINUITY”. As the locations and depths of any existing ground loops are unknown, can pay items be provided for this work?"
    Answer:   This work is to be paid under Item 260526-1 Install #2/0 Bare Copper Grounding Conductor.
Question Number  19:   "Sheet GI005 Note 3 requires “HAUL ROUTES MUST BE CONTINUOUSLY MONITORED BY A FULL TIME INDIVIDUAL TO ENSURE FOD IS BEING REMOVED.” Is this person incidental to the work? If so, what item?"
    Answer:   This person shall be paid for as incidental to Item 015525-1 Traffic Control.
Question Number  20:   " No erosion control is shown around the new underdrain and other storm drain or DIW work. Is the contractor required to do all things necessary to provide adequate erosion control? "
    Answer:   The contractor shall be required to do all things necessary to provide adequate erosion control, per the required SWMP. See Sheets CE101 and CE501. The work is paid as incidental to Item 015719-1 Erosion Control Measures – Temporary.
Question Number  21:   "Sheet CS101 has INSTALL SWITCH CABINET BLAST WALL, SEE DETAIL 3 ON SHEET CU114. Is this the correct reference for this detail? "
    Answer:   The correct detail is Detail 3 on Sheet CU514. This will be corrected via Addendum No. 2.
Question Number  22:   "Sheet CP501 details 4 and 8 call out P-610 lean concrete repairs. What does this call out reference? "
    Answer:   CTB/Lean concrete repairs are required in these areas to meet proposed grades and will be paid for under P-610-5.1 Repair Cement-Treated Base Course. CP501 Details 8 and 9 updated via Addendum No. 2.
Question Number  23:   "Sheet CU109 Note 3 states that the contractor will be required to obtain new sewer use and drainage permits for sand-oil and grease interceptor replacements. Can the costs of these permits be provided? "
    Answer:   Bidding Contractors shall contact that appropriate agency to obtain anticipated permit acquisition costs.
Question Number  24:   "Technical Specifications, Volume V, Section 147310 – Apron Drive Passenger Boarding Bridges, Part 1.2, A. states “This Section specifies the installation of new Passenger Boarding Bridges (supplied by others), including new passenger loading bridges, new fixed walkways, new pedestals and rotundas, new foundations, and all other associated equipment…” Part 5.1, A. states “…This price shall be full compensation for procurement and installation of Passenger Boarding Bridge equipment (supplied by others), and for all labor, equipment, tools, and incidentals necessary to complete the item.” Please confirm that DEN will provide the NEW Jet Bridges for Gate B19 and Gate B21, and that DEN will provide the new Fixed Walkways to be installed at Gates B19, B21, B23, B25, B27, B29, B31, and B35. "
    Answer:   DEN will be procuring and providing the new Jet Bridge and Fixed walkways for the gates stated above. The Contractor will be responsible for taking receipt of and installing new PLBs and fixed walkways, and relocation of existing walkways, including all incidental equipment. This work shall be paid for under Item 147310 bid items.
Question Number  25:   "Item P-152-4.3 Subgrade Bridging (18”) is given as a SY unit of measure. Please confirm this item is for the top 18” of replacement only utilizing lower select embankment material only and will not require any aggregate base course replacement. Is excavation paid for separately or is it incidental to the payitem? "
    Answer:   Subgrade bridging shall be completed per Section P-152-2.6, and excavation is incidental to the pay item.
Question Number  26:   "Please confirm that all dowel bars, dowel bar assemblies, and zig zags are to be epoxy coated. "
    Answer:   Dowel bars are required to be epoxy coated. Baskets and zigzags are allowed to be plain. Reference specifications P-501, P-610, and D-751.
Question Number  27:   "Sheet CU101, note 10 states that “All work on natural gas facilities shall be performed by Xcel Energy.” Does this also include the Existing Gas Valves to be Adjusted in phases 2, 3, & 4? "
    Answer:   Existing gas valves shall be adjusted by the Contractor and paid for under Item D-751-5.8 Adjust Gas Valve. Sheet CU101 Note 10 will be revised via Addendum No. 2.
Question Number  28:   "Sheet CU512, detail 7 stated that DEN to provide link seal and perform utility instillation through the wall but Note 9 on sheet PL101 states that the contractor is to provide the link seal. Please clarify who is responsible for providing the link seal and who will be responsible for the install. "
    Answer:   DEN Plumbing will provide and install all link seals on all utility lines which extend through the concourse basement wall. PL101 Note 9 will be updated via Addendum No. 2.
Question Number  29:   "Sheet GC101 states that all haul route drivers must be badged, please confirm that all haul companies must provide the $9 million excess umbrella liability insurance to operate on the airfield. "
    Answer:   All drivers on the airfield will be required to be badged and meet all insurance requirements for airfield driving as outlined on the DEN Security & Badging website.
Question Number  30:   Please confirm that the contractor is required to obtain fire department permits for entry into any confined space on the project, including all work inside of structures and manholes, whether the space meets the OSHA ‘permitted confined space’ requirements or not?
    Answer:   The contractor will be responsible for following both OSHA and ROCIP permitting requirements. In most cases ROCIP III safety requirements are more stringent than OSHA.
Question Number  31:   Note 8 on sheet E001 of Volume II, Passenger Loading Bridge Relocation calls for a fully engineered coordination study and associated NFPA 70E ARC flash study. In order to provide an accurate quote, a complete and accurate set of as built electrical drawings will need to be provided, including the limits of the study. Can you make these documents available? If not, what are the limits of scope for purposes of this bid?
    Answer:   The note indicates it is to be done for new and affected existing equipment. As such all new panels, breakers, disconnects, etc. should be included, as well as any modified/worked on/relocated existing equipment. The limits of the scope of the study will only include the equipment affected (or upstream of that affected) by the project. Reference Volume II One-Line Diagrams and Floor Plans. DEN has no other information for bidding purposes.
Question Number  32:   The schedule of prices and quantities does not seem to include bid items for the Volume II Passenger Loading Bridge Relocation. How would you like the proposal to reflect those items?
    Answer:   The work is included as incidental to the Section 147310 pay items.
Question Number  33:   Note 11 on sheets E101- E104 on Volume I, GARDI Ramp Improvements, calls for existing ductbank to be replaced if a mandrel cannot be pulled between junction boxes. In a worst case scenario, we could be required to replace all existing ductbanks, which would lead to a very expensive proposal. How would you like the costs to be carried for this contingency?
    Answer:   Addendum No. 2 will include revisions to the contract documents to include this contingency work, with associated estimated quantity, for bidding purposes. Per Note 11 on sheets EL101-EL104, an additional 4W-2” conduit shall be included as an additive alternate cost and carried as a contingency for the longest of the (6) duct bank segments indicated with note 11. Please provide an alternate cost to add one 390 ft duct bank run with (1) additional 4W-2” encased conduit adjacent to the existing duct bank between EHH-B15 and EHH-B14. Refer to the Addendum No. 2 drawings issued to revise Note 11 and add to Detail 5 on sheet EL502. Each existing duct bank run has a single spare 2” conduit and if this spare conduit is found not to be a viable raceway with the mandrel test, then this alternate cost will be used as a contingency to install an additional 4W-2” concrete encased duct between the handholes or valve vault access points where damaged ducts are discovered. The work to run a mandrel through the spare ducts in each of the indicated duct banks shall be part of the base bid.
Question Number  34:   I would like to request pre-approval as an equal to the listed trench drain systems shown on sheets CU-105 to CU-109 with the details on sheets CU-510 and CU-511. As part of the bidding process alternate products provide contractors an opportunity to more competitively price a project. The plans show the use of an Aircraft rated 12” throat frame and grate combination and a removable pre-sloped forming system (CU-510). In addition, there are a couple of 4” polymer concrete trenches with matching heavy-duty frames and grates. (CU-511).
    Answer:   Trench drain systems shall meet the requirements of Specification “Item D-750 Trench Drains” and Contract Drawings CU-105 – CU109, CU510, and CU511. Trench Drain acceptable manufacturers at DEN are outlined in Section D-750-1.3. Contractor requests for materials substitutions as “approved equals” shall be submitted following contract award, for DEN review and approval during the submittal review process.