1._NND16586677E_Solicitation_Amendment_4.pdf

(x)

NND16586677E

x x copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted ; or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGEMENT TO BE RECEIVED AT

THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted , such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

x

DFRC

Edwards CA 93523-0273 P.O. Box 273 M/S 4811-140 NASA/Armstrong Flight Research Ctr.

08/12/2016

13. THIS ITEM ONLY APPLIES TO MODIFICATION OF CONTRACTS/ORDERS. IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

12. ACCOUNTING AND APPROPRIATION DATA (If required) is not extended.is extended, Items 8 and 15, and returning

Offers must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended , by one of the following methods: (a) By completing

The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

FACILITY CODE CODE

10B. DATED (SEE ITEM 13)

10A. MODIFICATION OF CONTRACT/ORDER NO.

9B. DATED (SEE ITEM 11)

9A. AMENDMENT OF SOLICITATION NO.

CODE

8. NAME AND ADDRESS OF CONTRACTOR (No., street, county, State and ZIP Code)

7. ADMINISTERED BY (If other than Item 6)CODE 6. ISSUED BY

PAGE OF PAGES

4. REQUISITION/PURCHASE REQ. NO.3. EFFECTIVE DATE2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO. (If applicable)

1. CONTRACT ID CODE

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

08/12/2016

CHECK ONE A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE CONTRACT

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority) appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

E. IMPORTANT: Contractor is not, is required to sign this document and return __________________ copies to the issuing office.

ORDER NO. IN ITEM 10A.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

The following changes have been made to the solicitation:

1. The Question and Answers Part 3 document, dated 8/11/2016, has been added.

2. The attachment entitled, "4802 End Elevation", has been added.

3. The attachment entitled, "4802 Bottom Chord Bracing", has been added.

4. The attachment entitled, "4802 Roof Framing Section", has been added.

5. The attachment entitled, "Building Pressure Calculation", has been added.

Continued ...

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)15A. NAME AND TITLE OF SIGNER (Type or print)

15C. DATE SIGNED 16B. UNITED STATES OF AMERICA 15B. CONTRACTOR/OFFEROR 16C. DATE SIGNED

(Signature of person authorized to sign) (Signature of Contracting Officer)

Andrea C. Basham

STANDARD FORM 30 (REV. 10-83)

Prescribed by GSA

FAR (48 CFR) 53.243

NSN 7540-01-152-8070

Previous edition unusable

Except as provided herein, all terms and conditions of the document referenced in Item 9 A or 10A, as heretofore changed, remains unchanged and in full force and effect .

ITEM NO. SUPPLIES/SERVICES QUANTITY UNIT UNIT PRICE AMOUNT

NAME OF OFFEROR OR CONTRACTOR

2 11CONTINUATION SHEET

REFERENCE NO. OF DOCUMENT BEING CONTINUED PAGE OF

(A) (B) (C) (D) (E) (F)

NND16586677E

6. The attachment entitled, "HVAC Load Analysis", has been added.

7. The attachment entitled, "2012 Water Quality

Report", has bee added.

8. Specification Section 23 07 00 entitled, "23 0700 4802 Addendum", has been added.

9. The hour and date for receipt of offers is extended to Thursday, August 18, 2016 at 1:30 p.m. PDT.

NSN 7540-01-152-8067 OPTIONAL FORM 336 (4-86)

Sponsored by GSA

FAR (48 CFR) 53.110

Questions and Answers Part 3

8/11/2016

Question 65. Is there going to be a public opening of the bids and also will you be posting the abstract afterwards on FBO?

Answer 65. Yes, there will be a bid opening and the abstract will be posted on FBO.

Question 66. Drawing E-010, shows removing 480 volt feeders from the existing substation area (Note 2) to allow for installation of the new MV cable to feed the new equipment. We are to re-pull or pull in new feeders in the existing conduit from Buildings B4806 and B4803. There is nothing that says what size the existing feeders are, or even what size the services are that we are feeding. Is this information available?

Answer 66. The existing circuit breakers are 800 amp frame/400 amp trip. The existing feeder conductors are 350 kcmil.

Question 67. Revision to Answer 54 on “Questions and Answers Part 2” document. Please confirm that the existing ACM window caulking is to be left in place during the solar film installation.

Answer 67. Per the drawings and specifications, the window caulking is to remain in place. However, samples were taken and the window caulking is ACM. See testing reports provided as a separate attachment.

Question 68. Sheet M-001, air handling unit schedule – the air handling unit schedule identifies the manufacturer as being Munters, while specification section 23 76 00.00 10, paragraph 2.1.1 implies an evaporative system could be designed by another manufacturer with similar capacity and operation.

Will other manufacturer’s other than Munters be allowed? This should be of particular interest to the

Government as Munters equipment is some $400k(+/-) than equipment manufactured by others meeting the same requirements.

Answer 68. The design is based on Munters units being installed. Also, the other manufacturer’s unit must match technically all aspects of Munters to the component level. In summary, performance, capability, component, type of material, and workmanship has to match Munters. The contractor may choose to use a different manufacturer, but it is recommended to use Munters. If the contractor decides to pursue a different manufacturer, then the contractor will be responsible for meeting requirements of the design centered around the Munters units. If other units fail to perform identically to the Munters units, then the contractor will be responsible for any repair, replacement, or improvements to meet the design criteria.

Question 69. The instructions to bidders section L.17 52.228-1 BID GUARANTEE requires each bidder to submit a 20% bid bond or an amount of $3M, whichever is less. However, we are unable to locate a project specific bid bond form to be used. Would it be acceptable to submit the surety standard bid bond form with the bid?

Answer 69. Yes, it is acceptable to submit the surety standard bid bond form with the bid.

Question 70. Refer to Question and Answers dated 7/20/2016, Answer # 4, “Yes, cleaning and application of new solar film will be required at both the north and south hangar doors. Do not assume that any the quantities or dimensions provided in the plans are accurate, field verify.” Please confirm that the RFP drawings are the approved 100% construction drawings and can be relied upon by the prime contractors as accurate for bidding purposes.

Answer 70. Yes, these are the 100% For Construction Drawings and are as accurate as we know. Note 6 on Sheet G-001 states, “Verify all dimensions in field before proceeding with the work. Notify

Contracting Officer of any discrepancies, conflicts, and modifications.”

Question 71. Refer to Question and Answers dated 7/20/2016, Answer 5, it is the bidder’s responsibility to field verify the condition of the existing glazing. The existing glazing putty is considered to contain asbestos (Sheet G-001 General Note #14). Follow the requirements detailed in specification section 01

35 40.00 20, paragraph 1.7.3 if asbestos containing materials are disturbed.

For bidding purposes please confirm that the referenced note regarding field verification applies to post award verifications by the awarded contractor.

Answer 71. Yes, this would be a post award verification by the contractor, but asbestos will only become an issue if disturbed.

Question 72. Refer to Question and Answers dated 7/20/2016, Answer 8, Should fireproofing be required on any structural steel, this note applies.

XXX, the contractor cannot assume whether or not there is existing fireproofing. Please specify where, if any, fireproofing is required and provide a specification or confirm that fireproofing is not presently in scope.

Answer 72. No fireproofing is present on any of the structural members in the building. It is not anticipated that any will be needed in the new work.

Question 73. Refer to Question and Answers dated 7/28/2016, Answer 32, No, the contractor should plan to repair existing ductwork without a change order being issued since reusing existing ductwork is part of the scope of work.

Please clarify how the contractor is to quantify the amount of required duct repairs until after the DALT testing is completed?

Answer 73. The existing ductwork slated to be reused has been in place for over 20 years. Contractors shall employ prudent judgement in estimating the quantity of ductwork that will require resealing.

Question 74. Refer to Question and Answers dated 7/28/2016, Answer 53, A lead paint report is not available, the contractor should field verify prior to demolition.

Field verification can only be done via testing. Please clarify if the contractor is to include testing of the existing paint at the hangar doors for lead?

Answer 74. The Contractor should plan for any testing prior to demolition.

Question 75. Refer to Question and Answers dated 7/28/2016, Answer 61, the intent is for the existing louvers to be removed and replaced with new, like size. If existing conduits interfere, you may remove and reinstall them as required.

The louvers in this question are on the East side of the hangar per sheet M-202C. Please confirm that

Answer 61 relates to removal and replacement of 5 EXISTING louvers on the East side of the hangar. If the louvers are to be installed in new openings, please provide a detail for the new opening.

Answer 75. The intent is for the existing louvers to be removed and replaced with new, like size louvers.

A detail will not be provided.

Question 76. Under Section B of solicitation no. NND16586677E, there is a bid form which outlines the base bid, as well as the additive options (EXHIBIT A from attachments).

Additive #1 is the installation of (2) AHU’s Additive #2 is installation of Radiant Heaters Additive #3 is installation of Solar Film to inside of hanger door windows

Specification Section 01 11 00 SUMMARY OF WORK, Part 1.1.18 Base Bid and Additive Options (EXHIBIT

B from attachments) supports this.

However, looking at drawing sheets M-000 and M-001 (EXHIBIT C and EXHIBIT D, respectively) it can be seen that the additive options are as follows Additive #1 is installation of Radiant Heaters Additive #2 is installation of AHU 4 Additive #3 is installation of AHU 6

In short, the additive options from the solicitation and specifications directly contradict the additive options according to the drawings.

Answer 76. The specifications take precedence over the drawings. Contractors are to follow the summary of work for additive options.

Question 77. Ref Specification Section 28 31 00.00 10 paragraph 2.3 Nameplates - What would be the

'major components' requiring nameplates for the fire alarm system? Is the factory installed identification plate sufficient?

Answer 77. All components are expected to contain a manufacturer's nameplate as a minimum. A factory installed identification plate is acceptable. Contractor shall provide digital high resolution photos of each nameplate.

Question 78. Ref Specification Section 26 05 00.00 40 paragraph 3.2.5 Field Fabricated Nameplates -

Does this paragraph apply to fire alarm equipment? If so, which fire alarm components require nameplate identification?

Answer 78. Yes, this paragraph applies to fire alarm equipment. The duct detector enclosure will require field fabricated nameplate.

Question 79. The drawings (M-202A,M-202B and E-300) refer to the AHU 4 as add option 2 and AHU 6 as add option 3 but section B of the bid solicitation form places both AHUs under a single additive. Please clarify.

Answer 79. The specifications take precedence over the drawings. Contractors are to follow the summary of work for additive options.

Question 80. It has been brought to my attention that the duct detectors on the existing AHUs were newly installed as a part of the recent hangar repair project. If that is the case will it still be required to replace the duct detectors since at this point the existing duct detectors are less than two years in service?

Answer 80. Reuse of existing duct detectors is acceptable. Contractor shall ensure that they capture relocation of existing duct detectors and identify their new locations from existing locations. Installation of reused detectors on new AHU's must demonstrate workmanship equivalent to a new installation.

Question 81. We have reviewed spec 23 07 00 Thermal Insulation for Mechanical Systems and have found that the Pipe Insulation Execution Chart is missing from the specification. Additionally, this specification doesn’t specifically address the insulation, vapor barrier, or aluminum jacketing requirements for ductwork that is exposed to weather. Please advise.

Answer 81. The missing section of the specification is attached separately.

Question 82. “Isolation Valves will be provided for each individual gas fired appliance with solenoid shut-off connected to the fire alarm system” Please clarify this requirement. Is there to be a manual and a solenoid valve? Does the fire alarm system close the solenoid valve if smoke detected? Please specify the solenoid valve type: voltage, normally open or closed, etc. Please specify a manufacturer that is acceptable to the agency.

Answer 82. Solenoid valve connected to the fire alarm system is not required.

Question 83. The drawings and notes do not reference a shut off valve at the existing branch connection for Hanger Building 4802. Will the Edwards Base Facilities depressurize this line to allow for installation of the new site gas isolation valve and relight all effected gas appliances? If not, is hot tapping an acceptable alternative to install the isolation valve?

Answer 83. Gas flow may be stopped by pinching the existing line, then fusing the point of connection, or the contractor could request that NASA shut off the gas at the valve. The government will re-light the appliances.

Question 84. The gas schematic shows 12 PSI gas coming into the meter and 5 PSI gas exiting the gas meter. Is there a gas meter detail available, by pass, monitoring connections etc.? A gas meter would typically not drop the outlet PSI to 5 PSI is a regulator required downstream of the meter to drop the PSI to 5 PSI. Is the 2” line size on the outlet side of the meter correct?

Answer 84. The gas pressure entering the NASA complex is 12 psi. Install the appropriate new gas pressure regulator at each gas-fired appliance.

Question 85. Pipe Support Detail 3 show pipe being supported from unistrut between the structural members. Please provide more information on how to connect the unistrut to the structural members.

Are connections allowed to the bottom cord of the truss? Can pipes be connected directly to the truss?

If yes, please provide the detail. Please provide information on direction of the roof truss and the distance between the joist. Are the original structural drawings available to show truss orientation, size spacing etc.

Answer 85. Attach Unistrut to building structure per manufacturer’s recommendations. Connections may be made to the bottom chord of the truss provided there is adequate space. Attachment to bottom chord of trusses shall be per manufacturer’s instructions. Structural as-built of B4802 attached separately.

Question 86. 2.6 Seismic provision provide earthquake automatic gas shutoff valve . . . or excess flow valve. Will excess flow valve(s) be required in addition to earthquake automatic gas shutoff valve? We have, in the past, been required to supply both on Federal projects. Drip legs at outside AHUs could accumulate moisture and rupture in freezing conditions. If excess flow control valves are required please indicate locations for them to be installed.

Answer 86. Per the specifications the contractor is to provide an automatic gas shutoff valve or excess flow valve, but not both. Please provide one or the other.

Question 87. Our HVAC equipment supplier would like to know if the government has a water quality report. They would like to know what the water chloride and silica content is. This information well help determine the type of metal used to construct the HVAC units with, basically the type of stainless to prevent corrosion.

Answer 87. The only report we have available is from 2012 and is attached.

Question 88. Please confirm there is enough elevation to slope the AHU drains to the existing drains inside the building.

Answer 88. The Government believes there is enough elevation to the slope the AHU drains to the existing drains inside the building, but this does not relieve the contractor from field verification.

Question 89. Will water to the AHUs be subject to freezing and require heat tracing and insulation?

Answer 89. Yes, contractor should assume that the water to the AHU’s is subject to freezing.

Question 90. Will water and drain for the AHUs be insulated?

Answer 90. This question is not clear. This is assumed to mean the water lines and drain lines. These will need to be insulated.

Question 91. Drawing 32 of 47 Plumbing Floor Plan Area B shows the cold water lines connected to the

AHUs with a check valve. Summary of work calls for reduced pressure back flow protector (RPZ). Are we to use RPZs or Check valves? If RPZs are required can we install on 2-1/2” on the branch serving the units or one at each unit?

Answer 91. The contractor is to provide reduced pressure backflow protector at each unit.

Question 92. What is the measurement between lay in ceiling and bottom of trussing?

Answer 92. Please see drawings included as a separate attachment.

Question 93. Addendum # 1 to FY- 16 Repair Research Aircraft Hangar 4802 HVAC System, Solicitation Number NND165686677E “states”:

b. Specification Section 23 76 00.00 10. Revise all sections to stainless steel elements only. No other materials than stainless steel will be acceptable for evaporative cooling systems.

Clarification Requested: Should the manufacturer of the evaporative cooling equipment interpret the above statement as:

A) Upgrade the unit construction to include a stainless steel inner casing liner and floor in all sections only?

OR

B) Upgrade the entire AHU to be fabricated from Stainless Steel (as much as possible) and would include stainless steel double wall casing, stainless steel unit floors, stainless steel framework, stainless steel roof, stainless steel access doors (door frames of aluminum), stainless steel structural base/lifting frame, stainless steel dampers frames and blades, stainless steel filter frames and fasteners, stainless steel unit fasteners and hardware?

Answer 93. The Contractor should interpret to mean that the entire AHU to be fabricated from Stainless Steel (as much as possible) and would include stainless steel double wall casing, stainless steel unit floors, stainless steel framework, stainless steel roof, stainless steel access doors (door frames of aluminum), stainless steel structural base/lifting frame, stainless steel dampers frames and blades, stainless steel filter frames and fasteners, stainless steel unit fasteners and hardware.

Question 94. Could the Mechanical Engineer of Record confirm that all performance values shown for the Indirect Evaporative Cooling processes in the Air Handling Unit schedule are correct? We are not aware of any Polymer Elliptical Tube Indirect Evaporative Heat Exchanger designs on the market, with efficiencies that are high enough to achieve the low leaving air temperatures shown in the equipment schedule. Are we to understand that the performance of the “Specified” AHU-1 Indirect Heat Exchanger is 83% efficient in a single air pass?

Answer 94. We can provide the Mechanical Engineering design data that was used. However, the contractor may choose to contact the Mechanical Engineer of record at their own cost.

Question 95. Could the Mechanical Engineer of Record provide the Psychometric process and performance calculations used to derive the specified performance for each air handling unit (AHU-1 thru AHU-9)?

Answer 95. We can provide the Mechanical Engineering design data that was used. However, the contractor may choose to contact the Mechanical Engineer of record at their own cost.

Question 96. Specification Section 23 76 00.00, 2.6.4.1 Heat Exchanger/ and Equipment Schedule Notes:

A “Polymer Elliptical Indirect Evaporative Heat Exchanger” design is proprietary, and is only offered by Munters/Des Champs Products, Natural Bridge Station, VA. Furthermore, Munters/Des Champs Products only offers for sale a “Polymer Elliptical Indirect Evaporative Heat Exchanger” as a component of their Indirect Cooling Units. By requiring a single heat exchanger design (sole source), the specified evaporative cooling units are, in effect, being “sole sourced”. Will “Alternate” Indirect Heat Exchanger designs be considered?

Answer 96. See Answer 68.

Question 97. Specification Section 23 76 00.00, 2.6.4.1 Heat Exchanger/ and Equipment Schedule Notes:

Will an Indirect Heat Exchanger design consisting of Circular PVC Heat Exchange Tubes with “Z” shape aluminum fin inserts for improved heat transfer, be considered “Equal” to the specified heat exchanger?

Answer 97. Yes, as long as it meets the intent of the drawings and specifications.

Question 98. Specification Section 23 76 00.00, 2.6.4.2 Water Distribution Header: Will a spray manifold consisting of a PVC water distribution header and circular orifices be considered “Equal” to the specified spray nozzles? Section 2.6 EVAPORATIVE COOLERS states: Units shall be a self-contained indirect/direct multi-stage, weather resistant drip, type, blow through and shall conform to UL 507 and UL 746C.

Answer 98. Yes, as long as it meets the intent of the drawings and specifications.

Question 99. Specification Section 23 76 00.00, 2.6.1 Recirculation Air Fan Unit: Will EC fan motors with MODBUS communications be considered acceptable if EC fan motors with BACnet communications are not available?

Answer 99. No, must meet the intent of the specifications and be manufactured by Siemens.

Question 100. Specification Section 23 76 00.00, 2.6.4 Indirect Cooler Section: Will 304L Stainless Steel casing be required in the Indirect and Direct Evaporative Cooling Sections only?

Answer 100. Yes, this is correct.

Question 101. Specification Section 23 76 00.00, 2.7 CABINETS: Will 2” double wall casing consisting of 18ga. painted galvanized steel outer skin with 22ga. galvanized steel inner liner be acceptable?

Answer 101. These should be stainless steel as much as possible.

Question 102. Specification Section 23 76 00.00, 2.7 CABINETS: Will floor construction consisting of 16ga. aluminized steel be acceptable?

Answer 102. This should be stainless steel as much as possible.

Question 103. Specification Section 23 76 00.00, 2.7 CABINETS: Will under-floor insulation using fiberglass meeting or exceeding R-8 be acceptable?

Answer 103. Yes, this is acceptable.

Question 104. Is it acceptable to provide Air Handling Units that are wider and/or taller than the dimensions of the basis-of-design Munters air handling units?

Answer 104. Yes, as long as it meets the intent of the drawings and specifications.

Question 105. Air Handling Unit Schedule, Accessory Note # 3: Vane Axial Exhaust Fan, TEFC Motor is noted. Is it acceptable to provide more than one (1) Exhaust Fan installed on top of the Evaporative Cooling Units to handle the exhaust air?

Answer 105. One exhaust fan is preferred for maintenance reasons, but if two are necessary for air flow requirement, that would be acceptable.

Question 106. Air Handling Unit Schedule, Exhaust Fans: Could the Mechanical Engineer of Record provide the Total CFM of the Exhaust Airflow for each air handling unit (AHU-1 thru AHU-9)?

Answer 106. This information is contained in the equipment schedule.

Question 107. Air Handling Unit Schedule, Accessory Note # 15: Double Wall Foam Panel Construction is noted. Is it acceptable to provide 2” thick 1.5# fiberglass insulation between double wall casing, as described in Specification Section 23 76 00.00, 2.7 CABINETS?

Answer 107. Yes, this is acceptable.

Question 108. Air Handling Unit Schedule, Accessory Note # 20: Polymer Elliptical Tube Indirect Evaporative Heat Exchanger is noted. Is it acceptable to provide an Indirect Heat Exchanger design consisting of Circular PVC Heat Exchange Tubes with “Z” shape aluminum fin inserts for improved heat transfer?

Answer 108. Yes, as long as it meets the intent of the drawings and specifications.

Question 109. Air Handling Unit Schedule, Accessory Note # 21: Indirect Heat Exchanger Performance Requires ETL Certification is noted. Is it acceptable to provide performance testing other than ETL?

Answer 109. Please provide ETL certification per note.

Question 110. Amendment 1 – Question # 5 states that the existing glazing putty is considered to contain asbestos. Amendment 2 – Question # 54 states that the window caulking is to remain in place.

“Nothing in the drawings or specifications indicate that the window caulking is ACM.” However, on page G-001 of the drawings it states that the window putty should be considered hot (ACM). -Please advise.

Answer 110. Contractor should consider the window putty to be ACM and has been verified to be ACM.

Question 111. The existing window putty has irregular edges which will not allow the 1/8” to 1/16” separation to be achieved as per Specification Section 08 87 13 – 3.3 (b) Installation - Please advise

Answer 111. Trim the solar film to the largest rectangle possible without disturbing the asbestos containing material.

Question 112. On page G-001 of the drawings, Sheet Key Note 1 states to clean the inside and outside of the windows thoroughly and apply window film to inside of hanger door windows. The inside of the hanger door windows have an existing film installed. Are we to apply the new film over the existing film?

-Please advise

Answer 112. No, please plan to remove existing film and replace.

Question 113. Addendum # 1 to FY- 16 Repair Research Aircraft Hangar 4802 HVAC System, Solicitation Number NND165686677E “states”:

“b. Specification Section 23 76 00.00 10. Revise all sections to stainless steel elements only. No other materials than stainless steel will be acceptable for evaporative cooling systems.”

Clarification Requested: Should the manufacturer of the evaporative cooling equipment interpret the above statement as:

A) Upgrade the unit construction to include a stainless steel inner casing liner and floor in all sections only?

OR

B) Upgrade the entire AHU to be fabricated from Stainless Steel (as much as possible) and would include stainless steel double wall casing, stainless steel unit floors, stainless steel framework, stainless steel roof, stainless steel access doors (door frames of aluminum), stainless steel structural base/lifting frame, stainless steel dampers frames and blades, stainless steel filter frames and fasteners, stainless steel unit fasteners and hardware? -Please advise

Answer 113. See Answer 93.

Question 114. Could the Mechanical Engineer of Record confirm that all performance values shown for the Indirect Evaporative Cooling processes in the Air Handling Unit schedule are correct? We are not aware of any Polymer Elliptical Tube Indirect Evaporative Heat Exchanger designs on the market, with efficiencies that are high enough to achieve the low leaving air temperatures shown in the equipment schedule. Are we to understand that the performance of the “Specified” AHU-1 Indirect Heat Exchanger is 83% efficient in a single air pass? -Please advise

Answer 114. The design data is provided as a separate attachment.

Question 115. Stainless steel piping and fitting are now being required for all evaporative cooler make up water piping per addendum #1. Will pro-press type fitting be allowed and will 304 SS piping be acceptable?

Answer 115. The stainless steel requirement is for the AHU unit only. Stainless steel piping and fittings is not required. Pro-press fittings are permitted but 304 stainless steel piping is not required.

Press fittings for Copper Pipe and Tube: Copper press fittings shall conform to the material and sizing requirements of ASME B16.18 or ASME B16.22 and performance criteria of IAPMO PS 117. Sealing elements for copper press fittings shall be EPDM, FKM or HNBR. Sealing elements shall be factory installed or an alternative supplied fitting manufacturer. Sealing element shall be selected based on manufacturer's approved application guidelines.

Question 116. More info on tunnel needed. Plan did not provide enough information.

a. How congested is tunnel?

b. Dimensions for space LxWxH?

c. Is the top removable for access?

Answer 116. a. Contractor should assume that the tunnel is congested.

b. We do not have the dimensions, but it is long and wide enough to walk through. It is not high enough to stand up straight in.

c. The top is not removable for access.