ADDENDUM #1 TO ALL PROSPECTIVE BIDDERS: SUBJECT: IFB # … · 2019. 12. 18. · A2. Contractor shall provide all items shown on the equipment schedule except for: #11 Fume Hood, and

Department of Facilities and Transportation Services

Office of Design and Construction Services 8115 Gatehouse Road, Suite 3400 Falls Church, Virginia 22042-1203

May 6, 2019

ADDENDUM #1

TO ALL PROSPECTIVE BIDDERS:

SUBJECT: IFB # 19-028 Science Labs Conversion McLean High School, McLean, VA BID DUE DATE: No later than 2:00 p.m., May 8, 2019

THIS ADDENDUM IS SUPPLEMENTARY TO THE PLANS AND SPECIFICATIONS FOR THE SUBJECT

REQUIREMENT. ALL CHANGES, ADDITIONS, AND DELETIONS SHALL BECOME PART OF THE CONTRACT

AS IF ORIGINALLY CALLED FOR IN THE SPECIFICATIONS.

General

1. Pre-Bid Meeting Pre-Bid Conference Agenda and attendees list from the pre-bid meeting on May 1, 2019 is attached

Specifications:

1. Table of Contents Addition: Add specification section 10670 Metal Shelving Units to the Table of Contents.

2. Table of Contents Addition: Add specification section 15424 Domestic Electric Water Heaters to the Table of Contents.

2. Table of Contents Addition: Add specification section 15821 Cabinet and Ceiling Exhaust Fans to the Table of Contents.

3. Section 10670 Metal Shelving Units Addition: Add the attached specification section 10670 Metal Shelving Units to the Bid Documents.

4. Section 15424 – Domestic Electric Water Heaters Addition: Add the attached specification section 15424 Domestic Electric Water Heaters to the Bid Documents.



5. Section 15821 - Cabinet and Ceiling Exhaust Fans

Addition: Add the attached specification section 15821 Cabinet and Ceiling Exhaust Fans to the Bid Documents.

The following are Pre-Bid Questions and Answers:

Q1. Please clarify responsibility for casework subcontracting and associated scope of work.

A1. Contractor is responsible.

Q2. Please clarify which items under the equipment schedule are to be purchased and/or provided by owner or contractor.

A2. Contractor shall provide all items shown on the equipment schedule except for:

#11 Fume Hood, and

#12 Emergency Shower-Eyewash

Q3. Please confirm sprinkler work is the responsibility of the GC.

A3. No, Owner shall be responsible on this project.

Q4. Please confirm all subcontractor trades listed under section 0100 5B will require performance and payment bonds.

A4. No, only Contractor will require performance and payment bonds on this project.

Q5. Please confirm whether contractor or owner is responsible for stripping and waxing of floors.

A5. Contractor is responsible.

Q6. Please confirm extent of insulation per note 2 sheet M1.

A6. All insulation on existing piping in those two rooms shall be replaced.

Q7. Please confirm requirement for cleaning existing HVAC ductwork, note 4 sheet M1.

A7. Per Spec Section 15050 - clean equipment and make necessary adjustments (to owner’s discretion). Be sure existing HVAC equipment is dust free, has minimal to no damage, has clean filters, has operational fan belts that are also inspected for wear and tear, has operational coils and other associated devices and ductwork; clean and replace all of the above mentioned if necessary.



Q8. Please clarify distance needed between air supply and PRV at fume hoods.

A8. Per code, a minimum of 15 feet between the fresh air outlet to the center of the PRV is required; however I would suggest 24 feet between center or PRV to the fresh air outlet.

Q9. M3- Please confirm sequence of operations for PRV1 & PRV2.

A9. Sequence of operations is listed on M-3.

Q10. Please clarify location for emergency gas shut offs and eye wash tempering valves. Are walls thick enough or will chases need to be constructed to conceal.

A10. Locations for gas valve and eyes wash tempering shown on plumbing drawings are accurate, provide gypsum board and metal studs chase, approx. 3’-6” wide, and extend from floor to 6” above ceiling.

Q11. Please clarify scope of work at roof detail M4; an angle is indicated to be install, but angle size or welding requirements are not listed.

A11. For deck openings from 15" wide to 30" wide, and not supported by structural members: Weld a 1-1/2" x 1-1/2" x 3/16" steel angle to the underside of the roof deck at right angles to the roof deck ribs. Angle shall span joist to joist. Support the side parallel to the roof deck ribs with a 12" wide, 20 gauge steel sheet placed on the top surface of the decking, welded at each corner of the opening and spaced not more than 12" o. c. maximum along each side.

Q12. P4- Is acid resistant waste pipe required per "Typical Science Room Sink detail."

A12. No

Q13. Please provide riser diagram for CW, HW, Sanitary and gas.

A13. Please see plumbing tie-in locations on plan.

Q14. There are (4) 1 x 4 fixtures shown on drawing E-2 that are not identified on the fixture schedule.

A14.



Q15. The occupancy sensors shown on drawing E-2 are not correctly identified. A15. Refer to Specification 16506.

All other terms and conditions remain the same. Alfredo Basurto – Architect Office of Design and Construction

Attachments:

1. Pre-Bid Meeting Attendees 2. Pre-Bid Conference Agenda 3. Section 10670 Metal Shelving Units 4. Section 15424 Domestic Electric Water Heaters 5. Section 15821 Cabinet and Ceiling Exhaust Fans

End of Addendum #1

Attachments Follow

TYPE

4B

RECESSED L.E.D.

4000K

LUMENS

ARCH. LIGHT

FINELITE

NEORAY

PINNACLE

WILLIAMS

LPLWWT‐TGRID‐4‐HP7‐

LED‐UNV‐WH

HPW‐LED‐4‐FR‐LED‐4000K‐

277‐SC‐C1

S23XR‐1L40‐ETG‐4D‐UNV‐

ED‐SI

EV3WW‐40‐4G1G‐UNV‐1C‐

W

HETWG‐4‐PH30/840‐A‐

EDPH‐UNV

CLASSROOM

WHITEBOARDS (wall

washer) with

ceilings

10’‐0” or

less. Coordinate

locations to avoid

inter‐active

whiteboards &

projectors.

WALL WASHER

for teaching

wall

whiteboards.

Refer spec

16510,3.01,B

for additional

installation

requirements

10670-1 11/17

SECTION 10670

METAL SHELVING UNITS

PART 1 - GENERAL 1.01 RELATED DOCUMENTS

A. Drawings and General Provisions of Contract, including General Conditions and other Division 1 Specification Sections, apply to the Work of this Section.

1.02 DESCRIPTION OF WORK

A. Work Included: Provide all metal storage shelving, set completely in place, as indicated on the Drawings, specified herein, with all accessories required for a proper installation.

B. Standard shelving sizes shall be used.

C. Long runs of shelving shall be a combination of standard sizes to arrive at a total

length of shelving, as close to the length indicated on the Drawings as possible.

D. Shelf depths shall be as indicated on the Drawings, or the manufacturer’s next largest standard size.

E. Metal shelving located in the Gym storage area must have a “Ball lip” to the

edges of the shelves, so that balls cannot roll off of the shelves. 1.03 QUALITY ASSURANCE

A. Manufacturer's Requirements: Manufacturers shall have had a minimum of five (5) years successful experience in the manufacture of metal shelving.

1.04 SUBMITTALS

A. Comply with requirements of Section 01340.

B. Provide manufacturer’s catalog cuts indicating all dimensions, gauges of metal, construction and shelf support details, wall attachment details, etc., for each type of unit. Include shelf load capacity information.

C. Submit shop drawings indicating locations of shelving units, configurations of

shelving runs and shelving dimensions. D. Submit manufacturer's color chart indicating standard color selections. E. Submit manufacturer’s recommended assembly instructions.

1.05 DELIVERY, HANDLING, AND STORAGE

METAL SHELVING UNITS SECTION 10670

10670-2 11/17

A. Deliver all shelving in manufacturer's original, unopened cartons, with all

identifying labels intact. B. Outside of carton shall designate model numbers, colors, and other descriptive

information.

C. Shelving shall be handled and stored in a manner that will insure against abuse and construction damage, such as denting, bending or scraping.

D. Store in a clean, dry, secure area.

PART 2 - PRODUCTS 2.01 MATERIALS

A. Approved Manufacturers (Subject to requirements of this Section):

1. Penco Products, Oaks, PA, 1-800-562-1000 , (www.pencoproducts.com) (“Clipper” Shelving)

2. Lyon Workspace Products, Aurora, IL, 1-800-433-8488,

(www.lyonworkspace.com) (8000 Series) 3. Hallowell (Division of List Industries, Inc.), Deerfield, FL, 1-800-

776-1342 4. AMP (Art Metal Products) Deerfield Beach, FL, 1-800-252-5633,

www.ArtMetalproducts.com 5. Pre-bid approved equal in accordance with Section 01630

B. Intermediate shelving units shall have open sides with solid metal reinforced

shelves; provide double cross bracing not less than 12 gauge on the back of each unit for freestanding units; all wall units shall be anchored to wall.

C. Shelving units shall support minimum of 65 lbs. per square foot of total shelf

area. Provide seven (7) shelves per unit. Shelf shall be box formed. Front and rear flange shall utilize box beam construction. Flanges shall be welded on not less than 8" centers. Corners shall be lapped and welded. Sides shall be double flanged, not less than 22 gauge for 36” wide units, and 20 gauge for 48” wide units.

D. All shelves shall be adjustable, utilizing compression type clip of not less than 14

gauge (bolted assembly shall not be acceptable).


10670-3 11/17

E. Exposed Ends: Provide and install solid end panels of not less than 24 gauge at the end of each run of units.

F. All posts shall be angle post type not less than 14 gauge, punched on 1" or 1 1/2"

centers. (14 gauge beaded or 16 gauge “T” posts welded on 3” centers are acceptable).

2.02 COLORS

A. Colors shall be selected from manufacturer's standard colors (at least 6 color choices shall be available).

2.03 FABRICATION

A. Shelving units shall be thoroughly degreased with phosphate coating and dipped in chromic acid rinse for resistance to corrosion. Final coat shall be manufacturer’s standard baked-on enamel.

PART 3 - EXECUTION 3.01 INSPECTION

A. Contractor shall inspect areas to receive shelving and notify Architect or Owner's Representative if shelving cannot be installed in accordance with the Drawings and the final approved shop drawings.

B. Contractor shall be responsible for approved shelving fitting properly into

designated areas. 3.02 INSTALLATION

A. All wall shelving shall be attached to walls with the appropriate device for the type of wall.

B. Erect shelving according to manufacturer's recommended written assembly

instructions, in locations indicated on the Drawings.

C. Clearance for ceiling mounted sprinkler coverage: Where shelving shall be erected in rooms with pendant mounted sprinkler heads, maximum installed height shall not exceed 6'-0". Coordinate with ceiling heights shown on the Drawings for spaces scheduled to receive shelving. Verify actual ceiling heights prior to installation.

3.03 CLEANING


10670-4 11/17

A. Remove all debris and excess materials from the Project Site and dispose of legally.

B. Remove all dust, dirt, grease, and other foreign substances from all shelving.

END OF SECTION

15424-1 11/17

SECTION 15424

DOMESTIC ELECTRIC WATER HEATERS

PART 1 - GENERAL 1.01 GENERAL

The Bidding and Contract Requirements, Division 1 - General Requirements, Section 15010 - General Provisions, and Section 15050 - Basic Materials and Methods shall apply to this section.

1.02 SCOPE

The work covered under this section shall include providing and installing complete electric water heaters.

1.03 QUALITY ASSURANCE

A. The water heater shall meet the requirements of the current ASHRAE Standard 90.1, for energy conservation.

B. The electric water heater shall be factory wired in accordance with the National

Electrical Code, and the heater shall bear the UL label.

C. The water heater shall be tested at a pressure of 300 psi and shall have a water working pressure of 150 psi.

D. The water heater shall be installed as recommended by the manufacturer and local

codes.

E. The water heater installation shall include the start-up and check out procedures as recommended by the manufacturer. Provide the owner with a copy of the start-up record.

1.04 SUBMITTALS

Provide shop drawings on this equipment, including an installation diagram, as described in Section 15010, 1.04.

PART 2 - PRODUCTS 2.01 ELECTRIC WATER HEATERS

A. The size, type and capacity of the water heaters are shown on the drawings along

with the specified manufacturer. Water heaters fully equal to the water heater specified on the drawings and manufactured by RUUD (UNIVERSAL), A. O. SMITH,

DOMESTIC ELECTRIC WATER HEATERS SECTION 15424

15424-2 11/17

STATE, HUBBELL, BOCK or LOCHINVAR are acceptable. B. Tank - The steel tank shall be glass lined with magnesium anode to resist corrosion,

unless otherwise noted on the drawings. The tank shall be insulated to meet the current ASHRAE 90.1 requirements and shall be covered with baked enamel paint.

C. Heating Element - The heating element shall be the low watt density and screw-in

design. The voltage shall be as shown on the drawings and shall be stamped on the water heater.

D. Controls

1. The water heater shall have an adjustable thermostat for operating control.

The adjustable thermostat shall maintain the correct water temperature as stated on the drawings or required by Code.

2. The water heater shall have a high limit or over temperature control to cut off

the power in excess temperature situations. 2.02 PRESSURE AND TEMPERATURE RELIEF VALVE

The combination pressure and temperature relief valve for water heater(s) shall be rated equal to or greater than the maximum hourly heat input rate of the water heater. Each relief valve shall be ASME listed, rated and stamped. Pressure relief setting shall be 150 psi or less and temperature relief of 210 degrees F, all bronze body with stainless steel spring, test level and mounted to monitor the temperature within 6" of the tank.

2.03 EXPANSION TANK

Shall be ASME labeled and size listed on the drawings. Provide the tank with the required tappings and a prime coat of paint. The expansion tank shall be BELL & GOSSETT, TACO, JOHN WOOD, WESSELS or ARMSTRONG.

PART 3 - EXECUTION 3.01 INSTALLATION

A. The water heater shall be installed as shown on the drawings in an accessible location. Gate valves shall be installed on both the cold water supply pipe and the hot water pipe. A vacuum relief shall be installed on the cold water pipe between the gate valve and tank, and shall be located above the top of the tank. A thermometer shall be installed in the hot water pipe above the top of the heater. All valves shall be mounted so as to be accessible while standing on the floor.

B. Where water heaters are mounted above the floor, provide and install a shelf to

carry the water heater. The shelf shall have the capability of carrying the water heater filled with water.

DOMESTIC ELECTRIC WATER HEATERS SECTION 15424

15424-3 11/17

C. A drip pan, where shown on the drawings or required by Code, shall be provided and installed. The drip pan shall be of a size to accommodate the water heater. The drip pan shall be fabricated with a minimum of 22 gauge galvanized steel. The drip pan shall be piped full size to a receptor.

D. The relief valve shall be piped full size to a receptor.

E. The thermostats in the water heater shall be adjusted to produce the water

temperature called for on the drawings.

F. The water heater instruction booklet shall be secured to the water heater.

G. Provide a spare fuse for the water heater. H. Provide ASME rated expansion tank. Install as recommended by manufacturer.

END OF SECTION

15821-1 11/17

SECTION 15821

CABINET AND CEILING EXHAUST FANS

PART 1 - GENERAL 1.01 GENERAL

The Bidding and Contract Requirements, Division 1 - General Requirements, Section 15010 - General Provisions, and Section 15050 - Basic Materials and Methods shall apply to this section.

1.02 SCOPE

Provide and install the Cabinet and Ceiling Exhaust Fans as shown on the drawings and specified herein.

1.03 QUALITY ASSURANCE

Exhaust fan shall have Certified Rating Seal by AMCA and shall be UL listed. 1.04 SUBMITTALS

Provide shop drawings on this equipment as described in Section 15010 - 1.04. PART 2 - PRODUCTS 2.01 CABINET AND CEILING EXHAUST FANS

The exhaust fan shall consist of a centrifugal type fan with a direct drive motor. Fan shall be of the low sound level type. Motor speed shall not exceed 1100 rpm. The manufacturer shall be PENN VENTILATOR COMPANY. Fans fully equal to the specified manufacturer by GREENHECK, ACME, JENCOFAN, CARNES, US FAN or LOREN COOK are acceptable.

2.02 HOUSING

Shall be acoustically insulated and shall be provided with a backdraft damper, motor vibration isolation and electrical connections. Factory air inlet grille shall be provided on ceiling exhaust fans. Cabinet fans shall be arranged for inline duct mounting.

PART 3 - EXECUTION 3.01 INSTALLATION

A. The exhaust fans shall be installed as recommended by the manufacturer and as shown on the drawings.

CABINET AND CEILING EXHAUST FANS SECTION 15821

15821-2 11/17

B. Fans shall be controlled as outlined in the Automatic Temperature Control section.

END OF SECTION