Part III RFIs combined Responses CUP Bid Package KW Reviewed.pdf

DALLAS CENTRAL UTILITY PLANT

RESPONSE TO RFIs

36C10F20R0091

Part III

Question 3.001 : Reference C. PART III - PROPOSAL INSTRUCTIONS, C1. General, 3.(3) where it states "Offerors are to ensure vendorization via self-service portal:" For offerors that have not had a need to register prior, i.e. a new JV, please confirm that a company will be in compliance with the solicitation's requirements and not determined to be non-responsive if they have submitted the appropriate paperwork for the vendorization process but are now waiting for the government to process and approve their application and submit evidence of such.

Response: Please ensure that the JV has the agreement available to submit with the proposal.

The JV has been CVE certified and visible at VETBIZ at time of proposal and award. JV has it’s own DUNS as required by all businesses. The vendorization is not an evaluated item.

Question 3.002 : Reference sheet 70-C-301 and the hatching in the area of the newly added cooling towers where it states "structural pad by other refer to structural plans for details". Also refer to sheet 70-AS-101 in the same area where we are adding the cooling towers where it states

"Concrete Flat Work, Refer Civil". Now reference sheet 70-S-101. Nothing is shown on the structural drawings for the exterior concrete flat work. Please provide limits of work and details for this slab.

Response: The new concrete flatwork that is to surround the new cooling tower basin locations is dimensioned and detailed by CIVIL drawings. Refer CIVIL drawing 70-C-201 Dimensional

Control Plan for dimensioned extent of this new concrete flatwork. Also refer flatwork details on CIVIL drawings 70-C-201 and on 70-C-301. The concrete foundation provisions below the new cooling towers/basins and sump pits are provided within the STRUCTURAL drawings.

(Refer drawings 70-S-101 and 70-S-201 for additional details and information.) Clarifying changes to CIVIL drawing 70-C-301 are included with ADDENDUM 2.

Question 3.003: Reference sheet 70-S-101 and the note concerning the new 8" concrete slab.

a) Please confirm that 2'-4" (28 inches) of select fill is required underneath this concrete slab.

b) If so, please indicate the limits of this select fill. Is it only required under the cooling tower slab or also under the surrounding concrete paving?

Response:

a) Confirmed

b) It is only required under the cooling tower slab

Question 3.004 : Drawing 70-S-101: Please confirm where new plinths are needed on existing slabs.

Response: They are located in the similar location as the plinths are on the new slab.

Question 3.005 : Please confirm if Enecon system is acceptable in cooling tower basin locations in lieu of a Sherwin-Williams system.

Response: A substitute system (such as Enecon) will be approved and acceptable if it meets the requirements indicated in specification section 09 90 01 paragraph 3.5(H) for the basis of design.

Question 3.006 : Drawing 70-EP-101 calls for a new full reversing combination motor starter for 70-CHP6. It is shown as existing on the one-line diagram. Please verify what is needed

Response: The one line diagram is correct. 70-CHP6 is existing and does not require a new starter.

Question 3.007: Please verify the location of disconnect for 70-EF-02 (Not shown on Drawing

70-EP-101)

Response: 70-EF-01 is located on the roof around the location between 70-ACU1 and 70-ACU2.

70-EF-02 is located on the roof around the location between 70-CCU3 and 70-CCU4. Refer to mechanical sheet 70-MP-101. Both exhaust fans will require a 120V circuit for shut-off damper.

Question 3.008 : Drawing 70-EP-101 shows a CT9 & a CHWP9. These are not on the one-line diagram nor on the mechanical schedule. Is this in the scope and if is there more information on these?

Response: CT-9 and CHWP-9 are no longer in the scope of work.

Question 3.009 : Drawing 70-EP-102 note 15 states to provide power to the valve control box from a generator backed panel. Please clarify the locations of the generator backed panels?

Response: Generator backed panels are located in room 107A which is approximately 160’ southwest of most southern junction box.

Question 3.010 : Please confirm where the SWGR2 (5KV-600A), LMP, LCP are located as they are not shown on the drawings.

Response: See included drawing 70-E6 (from original CUP 1992 drawings) for location references only.

Question 3.011 : Please verify the scope of work in regards to existing breakers and modification requirements for panels: SWGR2, DBCP, and DBCT.

Response: All new work on 70-E-501 is shown in bold. Everything else is existing.

Question 3.012 : Please verify if there is to be any fire alarm work to be completed as there is nothing called out in the electrical drawings.

Response: Contractor to determine if any new fire alarm detection equipment is needed and if so, must tie into the existing system.

Question 3.013: Please verify rebar types needed for the canopy piers.

Response: Refer detail C1 / 70-S-021 for canopy pier rebar information.

Question 3.014 : Please confirm that all lightning protection whether reused, removed, replaced, or installed new will need to be recertified by UL master installer Response: If the current system has a UL master label, it will need to be recertified again or the

UL label becomes void.

Question 3.015 : For any new or reused underground or aboveground piping installed, will it be required to apply protective coatings, paint, primers before insulating?

Response: There is no coating required for such piping. (This is in agreement with VA requirements applicable for this project.)

Question 3.016 : For the CUP Building, is there an existing roof warranty/manufacturer or vendor that we should contact for any new work contained in this scope?

Response: This information will be provided after award.

Question 3.017 : Please confirm if bidders will be required to provide independent 3rd party security/patrol to watch the project site after hours during the construction period.

Response: YES. Please refer to spec section 01 00 00 paragraph 1.5.C Guards.

“1. The General Contractor shall provide unarmed guards at the project site after construction hours.”

Question 3.018 : Please confirm if the VA project will be tax exempt for the purchase of any materials or equipment placed into permanent use under this project scope.

Response: Documentation for tax exempt can be provided, but it is ultimately the decision of the supplier in allowing the tax exemption.

Question 3.019 : Will radiographic (x-ray) test be required on any welds below and above ground for any piping installed for the CUP project?

Response: There are no provisions that require such pipe welds to be x-rayed. (This is in agreement with VA requirements applicable for this project.)

Question 3.020 : Is there an existing water chemical treatment company the VA uses for the CUP building that we need to coordinate with for the new scope?

Response: VA will provide this information to the successful contractor after award.

Question 3.021 : Please confirm if onsite personnel will be required to be screened at the Hospital every morning upon arrival.

Will contractors be required to obtain independent COVID screening practices for any personnel working at the CUP or Outdoor facility every morning?

Response: COVID practices implemented by the VA local station must be followed throughout construction activities for this project. At this time, current practices include that all workers must be cleared through the VA screening process and be provided with an arm band each day. A listing of COVID Protocols in place at time of award, will be provided to the successful contractor including a map of screening locations to be utilized. Resident Engineer will notify and advise successful contractor of any subsequent changes to COVID protocols if/when they are implemented by the local station.

Question 3.022 : Please confirm if we are to repair/replace any piping insulation on Cooling towers 1 and 2 that are to remain in place, in order to match new piping systems.

Response: Cooling towers CT-70-1 and CT-70-2 are existing to remain. No work is currently specified for this equipment.

Question 3.023 : Refer to Safety of Environmental Violations and Experience Modification

Rate on pg. 7. We are a newly formed JV and do not have the information the RFP request in this section available for the JV. Can we submit the requested information for each member of the JV instead?

Response: EMR from each entity can be provided given that the information as a newly formed

JV is not available. Please be sure to follow the below instructions on obtaining the rating.

See solicitation page 7, “Safety or Environmental Violations and Experience Modification Rate”

This information shall be obtained from the bidder’s /offeror’s insurance company and be furnished on the insurance carrier’s letterhead. Self-insured contractor or other contractors that cannot provide their EMR rating on insurance letterhead must obtain a rating from the National

Council on Compensation Insurance, Inc. (NCCI) by completing/submitting form ERM-6 and providing the rating on letterhead from NCCI.

Note: Self-insured contractors or other contractors that cannot provide EMR rating on insurance letterhead from the states or territories of CA, DE, MI,NJ, ND, OH,PA, WA, WY, and PR shall obtain their EMR rating from their state run worker’s compensation insurance rating bureau.

Question 3.024 : Refer to the Technical Proposal Package Submittal Checklist on pg. 14 and

Price Proposal Package Submittal Checklist on pg. 24. Both checklists refer to the offeror submitting “one original and one CD.” Is the “original” version of each proposal the pdf copy being submitted by email or do we need to provide a bound copy in a binder as the original of each proposal and mail it in along with each CD copy?

Response: The original version is represented in the .pdf sent via email attachment. Bound copies are not required, the CD will serve as the bound copy (this is only due to dealing with current COVID 19 conditions)

Question 3.025 : Refer to pg. 22 under II Factor IV: Past Performance (Client Satisfaction), (i)

Submittal Requirements. Under this section, the RFP states we must obtain from our contacts responses to the PPQ provided with the RFP. However, are we allowed to use previously filled out and signed PPQs in lieu of re-requesting PPQs from clients on the PPQ form provided with this solicitation?

Response: Previous PPQs at the offerors discretion can be used. Please ensure that the projects submitted meet recent/relevant criteria as stated in the evaluation factor I, Ia.

The government reserves the right to obtain past performance information from any available source and may contact customers other than those identified by the offeror, along with any data obtained on projects in progress for VA or other agencies when evaluating past performance.

Question 3.026 : Refer 1. Price Proposal Submission, the paragraph on the top of pg. 24. The

RFP states the “price proposal must be submitted in a separate compiled package from the technical proposal package.” Do we have to send in the Price Proposal and Technical Proposal as separate parcels (i.e. in two independent boxes, shipped separately) or can we seal the technical proposal in an envelope and the price proposal in a different envelope and then mail both sealed envelopes as one parcel (i.e. two sealed envelopes shipped in the same box)?

Response: Yes, packages must be kept as separate and properly labeled.

Question 3.027 : Under what Tab in the Price Proposal should we submit the self-performance worksheet?

Response: Self-performance worksheet can be submitted in the Price Proposal under TAB 5.

Question 3.028 : Refer to the last cell in the Proposal Package Submittal Checklist on pg. 25.

This cell states we should mail our proposals via USPS (United States Postal Service), but on pg.

12 under C1. General, item (c), information is given on how to mail using Commercial Delivery

Services, in addition to USPS. Can we mail our proposals using Commercial Delivery Services such as FedEx and UPS or do we have to only use USPS?

Response: Yes, any form of delivery can be used with the exception of in person/hand delivery.

Question 3.029 : Please clearly outline what Representations and Certifications need to be completed and returned with the proposal. There seem to be several conflicting directions.

a. On pg. 24 in the Price Proposal Package Submittal Checklist under Tab 5, we are instructed to turn in a “printed copy of ‘Representations and Certifications as submitted on SAM.”

b. On pg. 32 I.4 52.204-19, Representations and Certifications are included by reference including those completed electronically via SAM.

c. On pg. 55 under Part IV Representations and Certifications there is Section K that appears offerors must fill out and return, not just print Reps and Certs off of SAM as instructed on pg. 25.

d. On pg. 63 under Section L.2 52.204-26 regarding Telecommunications Equipment and

Services, it appears offerors must fill out and return this section, not just print Reps and Certs off of SAM as instructed on pg. 25. As stated earlier, please provide a complete list of Reps and

Certs to be filled out and returned with the proposal.

Response: Rep and Certs that you completed in its entirety in SAM is to be submitted as a .pdf, under TAB 5 of the Price Proposal package. We are not accepting any printed information the technical and price proposal packages and all information contained is to be in .pdf format and submitted electronically and on CD.

Question 3.030 : Refer to pg. 25 in the Price Proposal Package Submittal Checklist, Tab 5. The directions state we are to provide a CVE Letter of Certification if we are proposing as an

SDVOSB. However, our CVE Letter of Certification is also requested under Tab E in the

Technical Proposal as a requirement for Factor III: Small Business Subcontracting Plan, per pg.

20. Do you want us to provide our CVE Letter of Certification in both Tab 5 of the Price

Proposal AND Tab E – Factor III of the Technical Proposal? If you want us to provide the CVE

Letter of Certification only once, under which Tab and in which Proposal would you prefer the letter be placed?

Response: Provide all information as instructed in the solicitation.

Question 3.031 : In the drawings it calls for the new section of fence to match material, gauge, color and configuration of the existing fence and privacy slats. Is there a spec section for this chain link fence?

Response: There is no specification included for this item. During the submittal process (after award) contractor shall provide a fence submittal for VA review and approval for proposed system to match the existing fence system and its related components.

Question 3.032 : Drawing 70-EP-101 Floor Plan Note 4 states to utilize (3) #3, (1) # 8 wires in a 1.25” conduit to the new VFD’s. Drawing 70-E-501 one line diagram states to use a 125.3 feeder which is (3) #1 and (1) # 6 wires in a 1.25” Conduit.

Which is correct?

Response: Drawing 70-E-501 is correct.

Question 3.033 : Drawing 70-EP-101 floor Plan states to feed the new CCU5 from SWGR2.

Where is SWGR2 Located? We need to know the distance for wire lengths in existing conduit.

Question 3.034 : Drawing 70-EP-101 floor Plan Note 2 states to replace the existing 60HP

VFD’s with 50HP VFD’s for CT’s 3, 4, 5, & 6. Drawing 70-E-002 Mechanical equipment schedule and Drawing 70-E-501 One Line Diagram shows they are 75HP.

Which is correct?

Question 3.035 : Drawing 70-EP-101 Notes 6 & 7 reference panel LCP. Please provide the location and a panel schedule for Panel LCP.

Question 3.036 : Drawing 70-EP-102 Site Plan Notes 5 & 8 State to replace existing 3P175A

Breakers with 3P150A Breakers. The panel schedules on 70-E-601 and One-line Drawing 70-E-

501 show 3P125A Breakers.

Which is Correct?

Question 3.037 : Drawing 70-EP-102 Site Plan Note 4 States to replace existing 3P40A

Breakers with 3P45A Breakers. The panel schedules on 70-E-601 and One-line Drawing 70-E-

501 show 3P40A Breakers.

Which is Correct and if they are existing, do they need to be replaced?

Question 3.038 : Drawing 70-E-501 One Line Diagram has note 3 to replace 5KV Cable. This note is not on the drawing. Does any 5KV cable need to be replaced or should we disregard this note?

Response: This note is no longer used and should be ignored.

Question 3.039 : Drawing 70-EP-101 has VFD’s for CWP9 and CT9. Are these future Items that need to be included? They do not appear on any other electrical drawing.

Response: These are no longer needed and should be ignored.

Question 3.040 : Please provide a specification and detail for the sluice gates as noted on sheet

70-MP-102. Drawing 70-M-301 states: “3’ sluice gate with removable dam for each cell with new towers." Specification section 23 65 00 2.1-I makes mention of the sluice gates, however does not provide a specification for said gates (e.g. material, etc.). The drawings also do not provide a detail for the sluice gates installation.

Response: Refer ADDENDUM 2 documents for new specification section added to the project manual. The new section is 23 65 01 SLUICE GATES. Also refer to ADDENDUM 2 drawings for additional sluice gates information including but not limited to drawings 70-A-101, 70-S-101 and 70-MP-102.

Question 3.041 : Drawing 70-EP-101 Floor Plan Note 5 States to use existing 3P250A

Breakers. The panel schedules on 70-E-601 and One-line Drawing 70-E-501 show 3P200A

Breakers.

Which is Correct?

Response: Drawing 70-EP-501 is correct, 200A breakers.

Question 3.042 : Drawing 70-EP-101 Floor Plan Note 5 states to utilize (3) 2/0, (1) # 4 wires in a 2.5” conduit to the new VFD’s. Drawing 70-E-501 one line diagram states to use a 200.3 feeder which is (3) 3/0 and (1) # 6 wires in a 2.5” Conduit. Which is correct?

Response: Drawing 70-EP-501 is correct.

Question 3.043 : Cooling Tower Specification 23 65 00 – Section 2.1 B references Casing

Panels to be constructed of corrosion and UV-resistant FRP. The cooling tower schedule on

Drawing 70-M-601 – note # 1 provide tower with stainless steel construction. We understand that cooling tower structural framing will be stainless steel conforming to ASTM A666, Type

304 (section 2.1 C). Please provide guidance on the construction of the Casing Panels – FRP or

Stainless Steel.

Response: Refer specification section 23 65 00 COOLING TOWERS as amended and issued for ADDENDUM 2. Also refer revised drawing 70-M-601. [[ The specified towers have stainless steel construction with FRP side panels. It is also acceptable to provide all stainless steel construction (in lieu of FRP side panels) as indicated within the specifications. ]]

Question 3.044 : Where is drawing sheet 70-PP-401 as referenced on sheet 70-P-101 note regarding the sanitary sewer invert elevation and continuation?

Response: There is no sheet 70-PP-401. Disregard any reference to it within the current documents. Refer to revised drawing 70-P-101 issued with ADDENDUM 2.

Question 3.045 : Is there a spec for the U/G site piping to cover the 6” sanitary extension at the new cooling towers?

Response: Refer ADDENDUM 2 documents for new specification section added to the project manual. The new section is 22 13 00 Facility Sanitary and Vent Piping.

Question 3.046 : Is there an “as-built” to show the existing U/G utilities within the project limits? Per Note ”Coordinate with existing Utilities” on sheet 70-MP-102. The Geotech report indicates an 8” sanitary line under the roadway, but no elevation or dimensions are provided.

Are there additional utilities?

Response: The VA will provide a utility survey to the successful contractor after award. The successful contractor will be expected to field verify information contained within the survey.

Question 3.047 : Please provide pipe support design / details for supporting the double 24”

CWS/R header at each column line per section detail D1 on sheet 70-S-201. As part of this, please confirm that the canopy steel design includes the weight of this piping.

Response: The canopy steel design per the Structural documents includes the weight of this piping. The connections and supports from the canopy steel provisions for this piping (i.e the pipe hanger requirements) are a delegated design item as per specification section 23 05 29

Anchors and Supports, as issued with ADDENDUM 2.

Question 3.048 : Drawing 70-EP-101 Note 3 states to install a 400A 3-pole disconnect for

CWP’s 3, 4 & 5. The symbol on the drawing shows 200A disconnect. Which is correct?

Response: Drawing 70-EP-501 is correct.

Question 3.049 : Drawing 70-E-501 Shows CT-6 Basin Heater is fed from Panel DBCT. The

Panel schedule on drawing 70-E-601 for panel DBCT does not show a breaker for the CT-6

Basin Heater. Should a 3P40A breaker be included in panel DBCT?

Response: Yes. Drawing 70-EP-501 is correct.

Question 3.050 : Drawing 70-E-002 Mechanical Equipment Schedule shows Remarks note 1 for 70-CT8, 70-CWP-8, 70-CHP-10 and 70-CHP-12 which references emergency power. The new panel DBECP that feeds this equipment is not an emergency panel. Do you want this equipment to be on emergency power?

Response: These equipment items are no longer to be on emergency power.

Question 3.051 : Please confirm that the Project Superintendent can serve as the CQC System

Manager as outlined in 01 45 00 3.4-B.

Response: No. The person designated as the CQC System Manager shall not also serve as the

Project Superintendent. Refer to revised specification section 01 45 00 included with

ADDENDUM 2 for change to 01 45 00 3.2-B.1.

Question 3.052 : Please confirm that the SSHO must be separate and independent from the superintendent per

1 45 00 3.4-A.

Response: YES.

Question 3.053 : Please confirm that there must be a separate and independent scheduler per

1.32.16.13.

Response: YES.

Question 3.054 : What is the reliability of Chillers 70-ACU1 & 2?

Response: The VA has a regularly scheduled maintenance program. The maintenance schedule may be adjusted to ensure these chillers will be available during construction. Coordination with the local station and the Resident Engineer is required.

Question 3.055 : Energy Center ventilation dampers are specifically notated on sheet 70-MD-

101. Is this simply for reference or is there work or modifications required of these dampers to accommodate the additional chiller 70-CCU5?

Response: This is for reference only, there is no additional scope for these dampers.

Question 3.056 : Expanding on GEI's RFI #5 previously asked, Drawing 70-GS-001 | Energy

Center Circle Road Closure | Please define temporary road closure shall not exceed 5 weeks.

i. Is the contractor to assume that Energy Center Circle can be ‘closed’ during that 5 week period?

ii. Is the contractor to assume that Energy Center Circle will need to be ‘plated’ at the end of each work day during that 5 week period?

iii. Is the contractor able to temporally close Energy Center Drive during normal work hours beyond the 5 week period (if needed) and plate at the end of each work day?

iv. Provide the phasing plan intent from the Engineer of Record on how the new CWS/R piping and tower replacements would be executed in the 5 week window with no temp cooling solution.

Response:

i. The closure of the loop road is a sequencing matter. It could be that the contractor chooses to utilize one single road closure of a continuous five week duration, but this is not the only approach that could be used. [[ i.e This “all lanes” closure for this road could be made up of multiple different closures (possibly of differing durations) all of which when totaled together do not exceed five weeks duration within the course of the construction project. ]] All such road closures must be coordinated and scheduled in advance with the VA Resident Engineer and the local station and as per related requirements included within the Bid Documents and the General

Requirements. Access to the O2 tank in the fenced yard with the cooling towers must be maintained and coordinated with the VA throughout construction activities.

ii. No, not during the combined total duration of five weeks.

iii. NO. Provide as per contract requirements.

iv. As a result of this project there will be a net increase in capacity of two 1000 ton cooling towers beyond current existing provisions. The work for demolition of the existing cooling towers shall be sequenced such that there is never a loss in overall total capacity for these cooling towers except for small downtime durations when new towers are being connected before existing towers are being disconnected. No more than one chiller may be disconnected at any given time. There also will exist at the end of the project, one existing basin which will no longer have a cooling tower above it.

Question 3.057 : Energy Center ventilation dampers are specifically notated on sheet 70-MD-

101. Is this simply for reference or is there work or modifications required of these dampers to accommodate the additional chiller 70-CCU5?

Response: This is for reference only. There is no additional scope for these dampers.

Question 3.058 : Expanding on GEI's RFI #6 previously asked, as it relates to the new 16”

Condenser Water Lines (CWS/R) for the new 70-CCU5:

a. Drawing 70-MD-101 – Removal of the existing 14” CWS/R piping.

i. Is the contractor to assume that the piping was placed prior to the Building 70 building foundation?

ii. Is the contractor to assume that the piping is not encased in the concrete foundation?

iii. Is the contractor to assume that the CWS/R piping extends to the middle of Energy Center

Drive as shown on 70-

MD-102?

Response : The exact piping extension is unknown and must be determined by the contractor. It is acceptable to make those stated assumptions regarding the foundation questions for bidding purposes.

Question 3.059 : Please provide Building 70 historical Chilled Water profile for the last three years (Plant Tonnage, Chilled Water Flows and Outside Air Temperature) for the month of

November, December, January and February.

Response : VA will not allow for reduction of current total capacity regardless of chilled water log information.

Question 3.060 : Please provide Building 70’s N+1 requirements for chilled water capacity during the colder months.

Response: N+1 is not a requirement for the project. No reduction of chilled water capacity is allowed for the project.

Question 3.061 : Is the contractor to assume that a temporary cooling solution will be required?

If so please provide the required cooling solution so all bidders can provide the government with the same solution that will provide required capacity and redundancy to meet the cooling demand for the medical center during the shoulder season.

Response: No. A temporary cooling solution is not anticipated. Follow the contract requirements. (Refer other RFI items with regard to sequencing issues for additional related information.)

Question 3.062 : While DIV 26 specification references all underground electrical raceways will be encased in concrete – please provide a detail for the new electrical ductbanks.

Response: Clarification for underground electrical raceway locations and related provisions have been included within ADDENDUM 2. (Refer modified drawing 70-EP-102) Refer specification section 26 05 41 Underground Electrical Construction and the electrical drawings for additional information.

Question 3.063 : Please provide pipe support design / details for new chiller piping within Bldg

70 – Energy Center.

Response : Refer to ADDENDUM 2 documents for new specification section 23 05 29 –

HANGERS AND SUPPORTS which has been issued.

Question 3.064 : Drawing 70-M-301 | Detail F4 | Detail F4 shows the new 16” CWS/R being installed under the corner of Building 70 and thru the turn-down foundation slab. i. There are no temporary shoring details to support the corner of Building 70 during excavation and installation of the new 16” CWS/R piping. Please provide temporary shoring plan. ii. During excavation of this area the existing soil compression will be compromised. Is the contractor to assume the need to go back with flowable fill?

Response: This is a means and methods issue. Contractor to provide temporary shoring.

Question 3.065 : Please confirm dimension and depth of canopy column piers as shown on sheet 70-S-101 (24” diam x 48” deep) comply with known Geotech per Detail C1/70-S-021, stating that pier length “to be determined by geotechnical engineer”.

Response: The anticipated depth is between 520 to 513. Actual depth of bearing strata needs to be determined in the field. For any significant differences in overall combined pier depth

(totaling less than 85% of overall length or greater than 115% of overall length as calculated for the bid) as encountered during construction activities, these will be treated as an unseen site condition and if necessary, become a negotiated change order.

Question 3.066 : Please provide Switchgear SWGR1 (15KV 2500KVA TX) Manufacturer and

G.O. number for fans to be installed

Response: Transformer is Square D serial number 930269-A1. Contact the manufacturer for cooling fan requirements.

Question 3.067 : Where do all the conduits from the Cooling tower area stub up on the inside of the building? Under panels or into J boxes?

Response: Into J boxes.

Question 3.068 : Where is the spare 4” for CCU5 stubbed up? What is the distance back to

SWGR2?

Response: This question is unclear. Distance from CCU5 to SWGR2 is approximately 100’.

Question 3.069 : Per the BAC concrete basin installation guide, the top of the support piers and the bottom of the cooling tower must be 3" below the basin water level. This does not appear to agree with the basin plinth detail D5 or the exterior basin wall detail F9 on sheet 70-S-201.

Please issue clarifying structural details for the three (3) new basins and three (3) existing basins.

Response: Per the manufacturer, the cooling towers have soft start fans and should not have problems if the tower is not the full 3” below the water surface. Actual depth below surface is 1’-6”

Question 3.070 : Regarding water treatment, Section 232500 1.3 B, we are to “coordinate with the existing chemical treatment provider to expand the existing systems as required for the new cooling towers and chiller cleaning and treatment”. Please provide the contact information for this existing contractor.

Response: VA will provide this information to the successful contractor after award.

Question 3.071 : Are the basin water levels to be controlled individually by basin or together as one continuous basin?

Response: Specification section 23 65 00 Section 2.1-I indicates that each basin shall have water level control.

Question 3.072 : On sheet 70-C-301, please clarify / define the scope and extent of "Repair

Existing Concrete" and "Existing Surface Defects."

Response: There is no specific listing of such existing surface defects available. The CUP project site tour that followed the pre-bid meeting was available for review of such surface defects.

Question 3.073 : Please provide Distribution panel SWGR2A (5KV) Manufacturer, G.O.

Number and a 200A breaker part number.

Response: Square D HVL 200A 5KV Fusible Air Switch. No Automatic Circuit breaker.

Question 3.074 : Please provide Distribution Panel DBCP manufacturer and Manufacturing # number or G.O. number so we can match existing equipment

Response: Square D I-Line 4000A 480V NW main breaker.

Question 3.075 : Please provide Distribution panel DBCT Manufacturer, G.O. number and a

40A, 70A, 125A & 200A breaker part number.

Response: Square D combination I-Line 4000A 480V NW main breaker

Question 3.076 : Please provide Distribution panel SWGR2A Manufacturer, G.O. Number and a 20A 2P breaker part number.

Response: Square D I-Line 4000A 480V NW main breaker and type 5 MCC sections

Question 3.077 : For the temporary requirement, please confirm it is acceptable to locate the equipment on the SE end of Bldg 70 adjacent to the roll-up door between the road and the building. This will be in close proximity to the Fisher House.

Response: A temporary cooling solution is not anticipated. Follow the contract requirements.

(Refer other RFI items with regard to sequencing issues for additional related information.)

Question 3.078 : On sheet 70-EP-101, Note 6 references panel "LCP" and circuits 36, 38 & 39 to power the new chiller CCU5. Please locate this panel on the floor plan and provide a panel schedule so we can field verify and coordinate the circuits per the note.

Question 3.079 : On sheet 70-E-501, the tower basin heaters are shown to have 4X disconnects.

Please confirm using a mix of 3R and 4X disconnects as shown.

Response: Confirmed.

Question 3.080 : On sheet 70-MP-102, the plan note says to re-install existing ladders, but no provisions are given for access between towers from these two spots or for fall protection.

Should the new towers be provided with integral ladders, walkway access and handrails for each tower?

Response: Such access provisions and other related provisions with connections between the six new towers for fan deck extensions, platform connections, the internal walkway, guardrails and handrail provisions at the new cooling towers and etc. can be found within the documents provided including but not limited to specification section 23 65 00 paragraph 2.1(N) and its sub-paragraphs. Refer detail E5 on drawing 70-AS-102 for additional information concerning the existing ladders. (( Please note there are no provisions for access connecting the grouping of the

2 existing towers to remain with the grouping of the six new towers across the open basin. ))

Question 3.081 : Sheet 70-E-501 – Sheet Note 1 indicates install 800 Amp CB in existing DBCP

1(a) - Sheet 70-EP-101 – Indicates to install new 1000 Amp CB on DBCP Tap:

Response: Drawing 70-E-501 is correct, 800A.

Question 3.082 : Sheet 70-E-501 – indicates to reference SITE PLAN E2 (Existing Drawings) for Pad Mounted Switch PS70B Can this sheet be loaded? Where is switch located? - Sheet

Note 3 for replacing #2/0 5KV cable with 3-#2/0, #2G, 5KV cable – Sheet Note 3 is not indicated on 7—E-501 and SITE PLAN E2 is not in drawing set. Does Sheet Note 3 require replacing #2/0 5KV cable to both SWGR2 transformers (PS7OB)?

Response: Switches are located in parking lot just outside of the building. Note 3 is no longer required.

Question 3.083 : Sheet 70-E-501 – Sheet Note 2 indicates to install 3#2/0, #2G, 4”C - 5KV to power New Chiller 70-CCU5 from SWGR 2. Where is SWGR 2 located? The feeder cable replacement referenced on SWGR2 is not tagged or in Feeder Schedule.

Question 3.084 : Sheet 70-E-501 – Feeder Schedule – 125.3 indicates 75HP – One Line indicates 100HP

Response: The question is unclear. Electrical does not see the conflict on the drawing.

Question 3.085 : Sheet 70-E-501 – Indicates 200A new breakers for CWP-3,4,5,6.

Sheet 70-EP-101 indicates the following:

Response: Drawing 70-E-501 is correct, 200A.

Question 3.086 : Sheet 70-E-501 – Indicates Feeder cable 70.3 to be 3#4,#8G-1 ½” C and 40.0 to be 3#8, #1oG, 1” C

Sheet 70-EP-102 indicates 3#6,#10G, 1”C for each separator on Sheet Note: 4

Response: Sheet 70-E501 is correct.

Question 3.087 : Sheet 70-E-501 – Feeder Schedule for 800.4 indicates

Sheet 70-E-501 – indicates the following:

Response: This equipment is existing and not in scope of work.

Question 3.088 : The Feeder Schedule on Sheet 70-E-501 doesn’t appear to align with one line.

Is the feeder schedule accurate? Are the feeders in MCC-871MCCCHP being replaced; the feeders are tagged?

a. Are these feeders being replaced?

Response:

Bold indicates new work which is in this scope.

Question 3.089 : 70-E-501 what is the feeder tag?

Response: Keynote 2 indicates the feeder requirements.

Question 3.090 : Drawing 70-MP-101 | Installation of (2) new 20” CHS/R on Thermal Energy

Storage (TES) Header. We understand that this 20” header can be isolated by the existing 20”

CHS/R just plan east of chilled water pump 70-CHP6. Detail B- M301 does not show these new valves or the 20” CHS/R going to/from the TES. Is the contractor to assume that there are

CHS/R isolation valves at the TES? If not, is the contractor to assume that draining and re-filling the TES will be required? Are there any chemicals in the chilled water system that would inhibit the contractor to draining the TES into existing sanitary drains? If draining the TES to existing sanitary is not allowed, is the contractor to assume temporary storage of the chilled water during the installation of the new 20” CHS/R headers? If temporary containers will be required, is the contractor to assume that the these containers can be staged on-site near or around the energy center? Please provide water capacity of the existing TES. If the TES has to be drained, is the contractor to assume that the cost of water and chemical to fill the TES will be paid by the government?

Response: There are existing isolation valves in the central plant and underground near the tank for these 20” chilled water supply and return pipes. These existing valves have not been activated in many years. The amount of water required to be drained should be minimal. Temporary storage provisions for chilled water are not anticipated. There are chemicals within the chilled water system. All such water drained must go to sanitary drains, not storm drains. The contractor should be prepared to freeze the pipes in case the valves at the storage tank and/or in the central plant leak or do not hold. Completely draining the TES nor draining a significant portion of the

TES are not anticipated and provision for such should not be included in the offer. Coordination and scheduling of all such work must be coordinated with the Resident Engineer and the local station. All major shutdowns are required to be scheduled well in advance, as per requirements within the Solicitation and the Construction Documents.