BL115_23 Addendum 3.pdf

September 27, 2023

Addendum No. 3

BL115-23

LITTLE SUWANEE CREEK GRAVITY SEWER AND FORCE MAIN PROJECT

The following addition/changes modify the Bid No. BL115-23 “Little Suwanee Creek Gravity Sewer and Force Main Project” Contract Documents, dated August, 2023, as first advertised on August 16, 2023.

This Addendum is being issued to provide the following revisions and/or clarifications to the bid documents and answers to the questions received.

Modifications Make the following changes throughout the Front-End Documents specifications changes below:

M1. Bid submittal date and location:

Sealed bids will be received by the Gwinnett County Department of Financial Services - Purchasing Division-2nd Floor, 75 Langley Drive, Lawrenceville, Georgia 30046 until 2:50 P.M. local time on November 21, 2023 and then publicly opened and read aloud at 3:00 P.M. Any bid received after 2:50 P.M. will not be accepted. Bid envelope must be marked on the outside with Bid Number, name of Bidder, date and time of opening. Contractor providing the utility work must have a current valid Utility Contractors License.

M2. Instructions on Submitting Questions Questions regarding bids should be submitted to Brittany Bryant, Purchasing Associate II at fax 770- 822-8728, or email Brittany.Bryant@gwinnettcounty.com no later than 3:00 p.m. local time, November 14, 2023. Bids are legal and binding upon the bidder when submitted.

M3. BID SCHEDULE

Replace BID FORM pages 18 through 20 in SECTION I INSTRUCTIONS TO BIDDERS completed with the attached BID FORM pages R18 through R20.

Clarifications Make the following changes throughout the Front-End Documents specifications changes below:

C1. Casing pipe installations will be required to be provided as-built survey control points for x, y, and z coordinates from a registered surveyor. Additionally, Contractor will provide information confirming installation length, casing pipe size, and description of each location are as noted on the BID FORM for each casing installation. These coordinates will be provided on the top and bottom of the casing pipe installation at each end point. This applies to BID SCHEDULE BID ITEM NO. 6, 7, and 8 included with this Addendum.

C2. All 16” DIP force main pipe shall be pressure class 350. This applies to BID SCHEDULE BID ITEM NO.

24, and 25 included with this Addendum.

C3. Air Release Valve installations shall be provided in accordance with the attached specification: 33 34 16 Sanitary Utility Sewerage Valves. This applies to BID SCHEDULE BID ITEM NO. 26 and 35 included with this Addendum.

C4. Air Release Valve Manhole Coatings shall be in accordance with the attached specification: 09 97 23 for the Air Release Valve Manholes. This applies to BID SCHEDULE BID ITEM NO. 35 included with this Addendum.

bktaylor Highlight bktaylor Highlight

BL115-23

Questions

Q1. Can you confirm that the casing pipe installation sizes and lengths as noted in the Bid Form are required to be installed specifically to the offered quantities? Does this bid contain a PQ? In one place it says it is not required and in another it says it is.

A1a. Casing pipe installation sizes and lengths are to be installed in accordance with the Contract Documents. Also, see C1 in this Addendum.

A1b. Potential bidders who do not currently meet the Pre-qualified Gravity Sewer/Force Main Sub-Sections 2 and 4 requirements, will be allowed to submit their pre-qualification application, and attempt be approved prior to the Bid Opening. If your firm falls in this category, it is your responsibility to submit the application and get approval prior to the Bid Opening date. If approved, those firms will be considered eligible to bid on this project. If not approved, reimbursement of the purchase price for Construction Drawings and Specifications will be allowed.

Q2. In review of the BL125-23 Rock Springs Medical Sewer drawings, can you confirm how access for the

Contractor awarded that project and the contractor awarded this project will need to coordinate to mitigate conflict on Laurel Drive from Rock Springs Road?

A2. See sheet 25 call-out for Laurel Valley Trail, and the Special Property Related Stipulations on the same sheet. These notes and stipulations already require the Contractor to maintain access along Laurel Drive. The Rock Springs Medical Sewer project includes a 30’ prescriptive easement along Laurel Drive, which the Contractor for this project will also respect. Both Contractors are required to submit construction schedules at the beginning of the project and will be asked to coordinate their work in a reasonable manner. MH 121 is added to the Bid Form for BL 115-23 (see the attached Bid Form items 28, 32, and 33) so it may be installed as part of this project, with the inlet / outlet connections for the Rock Springs Medical Sewer project plugged. If the Contractors for both projects must access Laurel Drive at the same time, a resolution / facilitation meeting may be arranged by GCDWR to assist in this coordination. Contractors will be required to provide notification in advance as noted in RP115-23.

Q3. In review of the BL125-23 Rock Springs Medical Sewer drawings, can you confirm coordination at MH- A17 for the Contractor awarded that project and the contractor awarded this project?

A3. See Q2/A2 in this Addendum (assuming the intended MH in question is MH 121). There should be no conflict for the installation of MH A17.

Q4. Do you have a Plug Valve specification that can be provided?

A4. See C2 this Addendum.

Q5. Will the ARV vault need to be a composite MH or can it be coated?

A5. ARV vaults shall be constructed of a corrosion resistant polymer concrete material in accordance with specification section A1-33 05 16.13 – Polymer Concrete Manholes or with a “High Risk” coating as set forth in the attached specification 09 97 23 – Special Concrete Coatings.

Q6. Can you explain why Class C bedding is required for the force main installation?

A6. The force main installation includes long sections of force main with minimal slope while maintaining positive grade. The Class C bedding should help the Contractor maintain grade in these sections. Also, to avoid additional Air Release Valves, some sections of the force main have greater than minimum cover. The Class C bedding will provide additional support for the pipe in these areas.

Q7. The stated contract completion time for this project is 360 days. The stated contract completion time for the Rock Springs Medical Sewer is 540 days. MH-121 is to be installed in the Rock Springs project and is the starting point for the 24-IN GS shown on Sheet 23. There could be a delay of almost six months to this project while waiting for MH-121 to be installed. Also, access to the Rock Springs project is along Laurel Drive where both contracts will be working at the same time. Please consider adjusting the time of this contract to finish later than the Rock Springs project.

A7. See Q2/A2 in this Addendum.

Q8. Several of the bores in the geotechnical report show auger refusal at depths that will require drilling and blasting for removal. Due to the close proximity of the new force main to the curb and edge of pavement, how will the Contractor be compensated for the roadway repair due to the blasting operation.

A8. Curb/Combination Curb and Gutter may be charged under BID SCHEDULE BID ITEM NO. 4 in Bid Form included with this Addendum, if within the lines and grades specified. See 31 23 00, 3.7A for unauthorized excavations, which are not payable.

Q9. The specifications for the 16” Plug Valves and Stainless Plug Valves on the ARVs were not included with the bidding documents. Please provide the corresponding specification for the plug valves.

A9. See C2 this Addendum.

Q10. Sheet 31, Detail PS-10B, shows the ARV assembly including all the stainless steel required components but the detail does not specify if the manhole needs to be coated on the inside or needs to be constructed of polymer concrete. Please clarify.

A10. See Q5/A5 in this Addendum.

Q11. Are the jack and bore installations guaranteed? Meaning the Contractor is responsible for installing the casing no matter the material encountered for the unit price bid. Also, will any of the crossings require the space between the carrier pipe and the casing pipe to be grouted with flowable fill?

A11. The jack and bore installations shall be in accordance with the Contract Documents. No, the space between the carrier pipe and the casing pipe will not require grouting with flowable fill.

Q12. Sheet 43 shows the Limits of Disturbance (LOD) from MH-121 to MH-A1 varying from 12 feet to 20 feet.

The Rock Springs project states there is a 30-foot easement along Laurel Drive. Please clarify what the LOD is in this area as those narrower dimensions shown would limit constructability.

A12. The limits will be extended to include a minimum of 20’ from the centerline of the pipe (see the attached easement from Signet Clinical, LLC for parcel 7147 005). The bulk of the temporary easement shown on parcel 7147 005 is for a laydown area for the Rock Springs Medical Sewer project and is not to be encroached upon by the Contractor for this project.

Q13. Sheet 02, General Note 19 states the Contractor may not string more pipe than will be placed that day. The sidewalk will need to be closed to pedestrian traffic throughout the work zone for removal and installation.

The Contractor will need string pipe within the construction zone. Please remove this requirement from the notes.

A13. This requirement is removed.

Q14. Much of the existing sidewalk along Tech Center Pkwy is an asphalt surface walkway. Please confirm this will be replaced with a concrete sidewalk. Is there a standard detail for the sidewalk replacement that can be provided?

A14. Replace sidewalk to match the width and material of the existing sidewalk – (Typical Sidewalk Section detail 315 is attached for the concrete sidewalk, although the width is to match existing, even when the existing width is greater than the Typical Sidewalk Section). Asphalt sidewalk shall be replaced with new Asphalt Sidewalk (the Asphalt Sidewalk Reconstruction detail is attached)..

Q15. Tech Center Pkwy and other locations have previously planted trees adjacent to and along the sidewalk.

Many of these trees will require substantial trimming and possibly removal to allow for installation of the force main. Please confirm trimming and/or removal is acceptable. If trees are removed, will the Contractor be required to replace these trees? If so, what size trees will be required to be replanted and how will the Contractor be compensated for tree replacement.

A15. Some reasonable tree trimming will be permitted for trees located within the right-of-way, but the Contractor is encouraged to minimize tree impact. Do not “remove” trees unless removal is agreed upon in writing by GCDWR for a particular tree located within the right-of-way. If a tree dies during the warranty period from root damage due to trenching said tree is not the responsibility of the Contractor. There is no item in the bid for tree replacement. However, if a tree is damaged or destroyed by the Contractor due to carelessness during construction, damages may be assessed for that tree at a minimum of $500 per tree.

Q16. Specification Section 33 31 00-7, Part 3.1 Bedding, Paragraph C makes reference to Standard Pump Station Specification Section 33 11 13.05. Please provide or confirm this is not required for this project. Also, please confirm Class C bedding is required for the force main as shown being that is not typical for pressure pipes.

A16. The reference to Specification Section 33 11 13.05 is deleted. Use bedding as indicated in the plans.

Q17. Have all the GUPS permits been secured for Williams Transco, Georgia Power etc.?

A17. Williams Transco and Georgia Power permitting is in progress.

Q18. No specification provided on 16” plug valves, please provide model number or acceptable manufacturers.

A18. See C2 in this Addendum.

Q19. For the ARV’s we need to know the size that is required for the project, we also need to see if we can use #150 flanges instead of #250.

A19. See Bid Schedule Item 35. #250 flanges are required.

Q20. Does all DIP on the job need to be P-401 lined, or only where “Ceramic Epoxy Lined” is called out on the bid form?

A20. No, not all DIP on the job needs to be P-401 lined. See the plan and profile sheets in the drawings for specificity on the locations where Ceramic Epoxy Coating is required.

Attachments

• BL115-23 Revised Bid Form

• Specification 33 34 16 Sanitary Utility Sewerage Valves

• Specification 09 97 23 Special Concrete Coatings

• Easement Plat for Parcel 7147 005 – Signet Clinical, LLC

• Detail 315 – Typical Sidewalk Section

• Asphalt Sidewalk Reconstruction detail

Acknowledge receipt of this addendum on the firm information page of the request for proposal.

Sincerely, Brittany Bryant

Purchasing Associate II

BID FORM

BID NUMBER: BL115-23

BID DATE: NOVEMBER 21, 2023

COMPANY NAME:

BIDDER’S SIGNATURE:

4. Bidder submits the following lump sum/unit prices for the Little Suwanee Creek Gravity Sewer and Force Main Project identified in Bid Form as part of this Bid.

Work included within each Bid Item is described in the Specification Section listed for that Bid Item. Payment for each Bid Item is described in Specification Section 01 22 15.11 – Measurement and Payment and Section A-01 22 15.11 – Supplemental Measurement and Payment listed for that Bid Item.

BID SCHEDULE

BID

ITEM

NO.

SPEC.

SECTION

DESCRIPTION

EST. QTY

MINIMUM

PRICE

UNIT PRICE

EXTENDED

PRICE

PART 1 - UNIT PRICE ITEMS

1 32 12 16 Asphalt Pavement Resurfacing (Measurement & Payment Item #1b)

4,000 SY $ $

2 34 71 00 Driveway Cut Restoration - Concrete (Measurement & Payment Item #2)

60 SY $ $

3 34 71 00 Driveway Cut Restoration - Asphalt

(Measurement & Payment Item #2)

460 SY $ $

4 32 16 13 Curb/Combination Curb and Gutter (Measurement & Payment Item #3)

2,500 LF $ $

5 32 16 13 Sidewalk Restoration (Measurement & Payment Item #4)

4,500 SY $ $

6 33 05 23.16 Steel Casing, Bore & Jack Installation, 36” Dia.

(Measurement & Payment Item #5)

235 LF $ $

7 33 05 23.16 Steel Casing, Bore & Jack Installation, 48” Dia.

(Measurement & Payment Item #5)

265 LF $ $

8 33 05 23.16 Steel Casing, Open Cut, 36” Dia.

(Measurement & Payment Item #5)

70 LF $ $

9 32 92 00 Permanent Seeding (Measurement & Payment Item #7)

6,500 SY $1.50 $ $

10 32 92 00 Sodding (Measurement & Payment Item #8)

9,500 SY $ $

11 32 93 43 Tree Save Barrier Fence (Measurement & Payment Item #9)

4,000 LF $1.80 $ $

12 31 41 16.10 Traffic Control - Devices (Measurement & Payment Item #11a)

1 LS $ $

13 31 25 00 Erosion and Sediment Controls - Hay

Bales (Sd1) (Measurement & Payment

Item #12b)

160 EA $8.00 $ $

14 31 25 00 Erosion and Sediment Controls –

Temp Silt Fence C (Sd1) (Measurement

& Payment Item #12d)

9,500 LF $2.50 $ $

R18

Addendum No. 3 - Bid Form

BID DATE: NOVEMBER 21, 2023

COMPANY NAME:

BIDDER’S SIGNATURE:

R19

BID SCHEDULE CONTINUED

BID

ITEM

NO.

SPEC.

SECTION

DESCRIPTION EST. QTY

MINIMUM

PRICE

UNIT PRICE

EXTENDED

PRICE

15 31 25 00 Erosion and Sediment Controls –

Slope Stabilization (Ss) (Measurement

& Payment Item #12f)

1,000 SY $ $

16 31 25 00 Erosion and Sediment Controls – RipRap (St) (Measurement & Payment Item #12h)

25 SY $45.00 $ $

17 31 25 00 Erosion and Sediment Controls – Mulch (Ds1) (Measurement & Payment Item #12i)

10 TN $ $

18 31 25 00 Erosion and Sediment Controls – Temp Seeding (Ds2) (Measurement & Payment Item #12j)

16,000 SY $0.90 $ $

19 02 42 11 Site Restoration and Cleanup (Measurement & Payment Item #13)

1 LS $ $

20 01 78 39 Project Record Drawings (Measurement & Payment Item #14)

1 LS $ $

21 33 31 00 Sanitary Utility Sewerage Piping – 6”

Diameter DIP (House Connections)

(Measurement & Payment Item #27b)

65 LF

22 33 31 00 Sanitary Utility Sewerage Piping, – 24”

Diameter DIP, PC 200 (Measurement

& Payment Item #28)

1,996 LF

33 31 00

Sanitary Utility Sewerage Piping, – 24” Diameter DIP, PC 200, Ceramic Epoxy Line (Measurement & Payment Item #28)

655 LF

24 33 31 00 Sanitary Utility Sewerage Piping (FM)

– 16” Diameter DIP, PC 350 (Measurement & Payment Item #29a)

4,395 LF $ $

33 31 00

Sanitary Utility Sewerage Piping (FM) – 16” Diameter DIP, PC 350, Ceramic Epoxy Lined (Measurement & Payment Item #29a)

2,705 LF

26 33 34 16

Sanitary Utility Sewerage Piping (FM)

– Plug Valve (Measurement & Payment Item #29c)

3 EA $ $

27 33 05 16.13 Standard Manhole, 48”, Dia.

(Measurement & Payment Item #31a) 80 VF $ $

28 33 05 16.13 Polymer Concrete Manhole, 48” Dia.

(Measurement & Payment Item #31a) 50 VF $ $

29 33 05 16.13

Large Manhole Base, 60” Dia. With Transition Slab

(Measurement & Payment Item #31b)

10 EA $ $

BID DATE: NOVEMBER 21, 2023

COMPANY NAME:

BIDDER’S SIGNATURE:

R20

BID SCHEDULE CONTINUED

BID

ITEM

NO.

SPEC.

SECTION

DESCRIPTION EST. QTY

MINIMUM

PRICE

UNIT PRICE EXTENDED

PRICE

30 33 05 16.13 Large Manhole Base, 60” Dia. With

Transition Slab,- Polymer Concrete

(Measurement & Payment Item #31b)

5 EA $ $

31 33 05 16.13 Large Manhole Base, 72” Dia. With Transition Slab (Measurement & Payment Item #31b)

2 EA $ $

32 33 05 16.13

Large Manhole Base, 72” Dia. With

Transition Slab – Polymer Concrete

(Measurement & Payment Item #34)

1 EA $ $

33 33 05 16.13 Manhole Frame and Cover – Traffic Rated Type (Measurement & Payment Item #31c)

18 EA $ $

34 33 05 16.13 Manhole Core, 24” (Measurement & Payment Item #31e) 1 EA $ $

35 33 01 30.71 Manhole Invert Rehabilitation (Measurement & Payment Item #32) 1 EA $ $

36 33 34 16 Air/Vacuum Valve Assembly – 2” (New Installation) (Measurement & Payment Item #35)

2 EA $ $

37 A-01 22 15.11 Rock Removal – Trench Rock (SUP#1) 1,200 CY $ $

38 A-01 22 15.11 Wetlands, Stream Banks and Stream Buffer Restoration (SUP#2)

1LS $ $

39 A-01 22 15.11 Temporary Stream Crossings (Sr)

(SUP#3)

1 LS $ $

40 A-01 22 15.11 Exterior Manhole Joint Wrap (SUP#4) 1,010 LF $ $

41 A-01 22 15.11 Gravel Roadway Repair (SUP#5) 1,600 SY $ $

PART 1 TOTAL $

PART 2 – OWNER DIRECTED ITEMS

42 02 32 19 Exploratory Excavations (Measurement and Payment Item #10 35 EA $270.00 $ $

43 31 41 16.10 Traffic Control – Police Officer (Measurement & Payment Item #11b)

1,000 HR $55.00 $55.00 $55,000.00

PART 2 TOTAL $

OVERALL TOTAL (PART 1 + PART 2) $

Gwinnett County Department of Water Resources Sanitary Utility Sewerage Valves Standard Pump Station Specifications 33 34 16-1

SECTION 33 34 16

SANITARY UTILITY SEWERAGE VALVES

PART 1 GENERAL

SUMMARY

A. Section Includes

Paragraph Title

1.2 Submittals

1.3 Quality Assurance

1.4 Delivery, Storage, and Handling

1.5 Warranty

2.1 General

2.2 Plug Valves

2.3 Ball Valves

2.4 Swing Check Valves

2.5 Sewage Air Release Valves

2.6 Extension Stems

2.7 Floor Stands

2.8 Valve Boxes

2.9 Manual Valve Operators

2.10 Electric Valve Actuators

2.11 Painting

2.12 Shop Testing

3.1 Installation

3.2 Shop and Field Testing

B. Scope

The work covered by this section includes furnishing all labor, materials, and equipment required to install, test, and place into satisfactory operation all sewerage valves and valve appurtenances as shown on the Drawings and/or specified herein.

SUBMITTALS

A. Action Submittals/Informational Submittals

Product Data Product data sheets for each make and model. Indicate valve type number, applicable tag number, and facility name/number or service where used.

Complete catalog information, descriptive literature, specifications, and identification of materials of construction.

For each power actuator provided, manufacturer’s standard data sheet, with application specific features and options clearly identified.

Sanitary Utility Sewerage Valves Gwinnett County Department of Water Resources 33 34 16-2 Standard Pump Station Specifications

Sizing calculations for open-close/throttling and modulating valves.

Shop Drawings Power and control wiring diagrams, including terminals and numbers.

Certificates Manufacturer’s certificate of compliance.

Test and Evaluation Reports Shop testing reports.

B. Closeout Submittals

Operation and Maintenance Data Complete operation and maintenance manuals in accordance with Section 01 78 23

– Operating and Maintenance Data.

Warranty Documentation Copy of manufacturer’s warranty on company letter specifically indicating

Owner’s warranty coverage.

QUALITY ASSURANCE

A. Qualifications

Manufacturers Valves and equipment furnished under this section shall be the product of firms regularly engaged in the design and manufacture of such equipment for a minimum of five (5) years.

Installers/Applicators/Erectors Have installation, calibration and testing of valves and equipment furnished under this section performed by qualified, skilled technicians who are regularly engaged

Standard Pump Station Specifications 33 34 16-3 in such activities involving systems of similar complexity, and who possess all licenses and certificates required to perform such work.

B. Certifications

Furnish a written certification to the Engineer that all valves comply with all applicable requirements of the governing AWWA standards specified herein.

DELIVERY, STORAGE, AND HANDLING

A. Delivery and Acceptance Requirements

Complete drain valves prior to delivery.

Protect ends of flanged and mechanical joint valves with full size wooden baffles securely bolted to the valve ends. Make the baffle size at least equal to the outside diameter of the flange.

B. Storage and Handling Requirements

Secure valves sized 24-inch and larger to wooden skids to facilitate handling and storage.

WARRANTY

A. Manufacturer Warranty

Provide a warranty against defective or deficient equipment, workmanship and materials for a period of five (5) years under normal use, operation and service.

Provide the warranty in printed form and apply to all similar units.

PART 2 PRODUCTS

GENERAL

A. Note that all valves, especially in the smaller sizes, are not necessarily shown completely on the drawings, which are more or less schematic. However, Furnish and install all valves indicated or required for proper operation of the equipment or services requiring such valves.

B. Coordinate the location and position of valve operators. Clearly show the operator position for each valve in the shop drawings.

C. Cast the word “OPEN”, an arrow indicating the direction to open, and flow direction arrows on each valve body.

PLUG VALVES

A. General

Provide plug valves of the non-lubricated, resilient-seated, eccentric valve design, conforming to the latest revision of ANSI/AWWA C517-05. Only use new materials.

Compose plug valve body and cover of cast iron in conformance with either ASTM A126, Class B or ASTM A48, Grade 40. Provide mechanical joint ends conforming to ANSI/AWWA C111/A21.11 on all buried valves, and Class 125 flat face flanged ends, 33 34 16-4 Standard Pump Station Specifications at a minimum, conforming to ANSI B16.1 or ANSI/AWWA C110/A21.10 on all exposed valves measuring 4 inches in diameter and larger.

Minimum Valve Body Pressure Rating:

Valves measuring 3 inches to 12 inches in diameter: 175 psig.

Valves measuring 14 inches and greater in diameter: 150 psig.

For specific installation locations where the Total Dynamic Head (TDH) plus the surge pressure exceeds the minimum pressure ratings above, provide Class 250 flat face flanged ends and a 400 psi (for 3-inch to 12-inch valves) or 300 psi (for 14-inch and larger valves) valve body.

For plug valves with 175 psi bodies and class 125 flat face flanges provide valve with the following face to face dimensions.

Nominal Valve Diameter (inches)

Lay Length (inches)

3 8.0 4 9.0 6 10.5 8 11.5

10 13.0 12 14.0

B. Provide a solid one-piece casting plug composed of cast iron covered with a resilient elastomer; two-piece plugs or plugs with internal cavities are NOT acceptable. Cover the plug face with either EPDM or Neoprene; plug facings composed of natural rubber, Viton, or Nitrile are NOT acceptable. Compose seats of either 95 percent nickel alloy or Type 316 stainless steel; seats composed of thermosetting epoxy or fusion bonded nylon are NOT acceptable. Screwed-in seats are NOT acceptable.

C. Provide plug valves with a minimum % port area of 67% using the nominal pipe diameter as the basis of measurement. Port area is the minimum cross-sectional area within the valve perpendicular to the flow, expressed in square inches. Provide valves with a port area exceeding the following minimum requirements:

Nominal Valve

Diameter (inches) Minimum Port Area

(inches2) 3 5.75 4 11.00 6 24.50 8 42.50

10 64.50 12 89.50 14 118.50 16 158.50 18 193.50 20 238.50 24 309.50 30 494.50 36 712.50

D. Provide permanently lubricated, sleeve-type, sintered, oil-impregnated radial shaft bearings composed of either Type 316 stainless steel in accordance with ASTM A743, Grade CF- 8M, or oil impregnated bronze in accordance with ASTM B127. Non-metallic radial thrust bearings are NOT acceptable. Compose thrust bearing/washers of Type 316 stainless steel, Standard Pump Station Specifications 33 34 16-5

Teflon, Nylon 11, or Nylatron. Provide either the U-cup type or multiple V-ring type shaft seals composed of either EPDM or Neoprene. Provide shaft seals that are self-adjusting and repackable without removing the bonnet or actuator from the valve or removing the valve from the line. Plug valve and connecting pipe shall have the capability to be pigged without the use of special equipment.

E. Install plug valves and operators according to the manufacturer’s recommendations for conveying fluids with high solids concentrations. For horizontal installations, install plug valves so that the plug face is pointing upwards when the valve is open and so that the plug face is facing the pump when the valve is closed. For vertical installations, install plug valves so the plug face is pointing to the side when the valve is open and so that the plug face is pointing upwards when the valve is closed. For plug valves installed in vaults or below grade, install all plug valves horizontally with right angle operators pointing up to allow operation from grade.

F. Provide manual lever operators on above-ground valves 6 inches in diameter and smaller, unless otherwise specified or noted on the Drawings. Provide manual hand wheel operated, through totally enclosed worm gear actuators on above ground valves 8-inches in diameter and larger, unless otherwise specified or shown on the Drawings. Equip manual operators for plug valves mounted above 6 feet from the operating floor with worm gear actuators, chain wheel, and operating chain. Provide all buried valves with totally enclosed worm gear actuators, 2-inch square AWWA operating nuts, and valve boxes. Provide all valves with mechanical travel stops for the open and closed positions, which provide 90 degree rotation from fully open to fully shut. Design gear actuators to produce the required operating torque with a maximum rim pull of 80 pounds on a hand wheel/chain wheel and with a maximum input of 150 foot-pounds on 2-inch operating nuts. Design actuator components between the input and the open and closed position stops to withstand, without damage, a rim pull of 200 pounds for hand wheels/chain wheels and an input torque of 300 foot-pounds for 2-inch operating nuts.

G. Directly cast or provide valves with corrosion-resistant nameplate stating, at a minimum, the valve serial number, manufacturer, size, maximum shutoff pressure, and design pressure rating. Clearly indicate the seat end on the valve exterior relative to half of the body containing the plug/seat interface.

H. Submit certified Shop Drawings showing the principal dimensions, construction, and materials used for all parts of the valve and actuator; clearly indicate the minimum dimensions encountered within the valve port when the plug valve is fully open. Certify that the plug valve(s) furnished are capable of operating in continuous duty service under the pressure and flow conditions at each installation location. Prior to valve shipment, provide written affidavit to the Engineer and Owner attesting the plug valve(s) furnished comply with the requirements of the Contract Documents, comply with the applicable portions of ANSI/AWWA C517-05, and match what is shown on the Shop Drawings.

Hydrostatically test each valve and test for bubble tightness at the factory after the operator has been mounted and adjusted. Provided written certification of test conformance to Engineer and Owner prior to valve shipment.

I. Shop paint all internal and external ferrous components and surfaces of the valves, with the exception of stainless steel and finished or bearing surfaces, with two (2) coats (10 mils minimum dry film thickness) of the manufacturer’s premium epoxy for corrosion

33 34 16-6 Standard Pump Station Specifications resistance. Repair damaged surfaces in accordance with the manufacturer’s recommendations.

J. Manufactures

DeZurik.

Val-Matic.

Henry Pratt.

Engineer approved equal.

BALL VALVES

A. Small Ball Valves (3” and Smaller)

General Unless otherwise specified, provide quarter-turn type small ball valves with full pipe size opening through the valve. Provide valves suitable for a differential working pressure in either direction of not less than 400 PSI.

Manufacturers

Apollo 70-100 Series.

Engineer approved equal.

Construction Unless otherwise specified or required, small ball valves shall have brass body, self-aligning Type 316 stainless steel ball, blow-out proof Type 316 stainless steel stem, reinforced Teflon seats and seals, plastic-coated Type 304 stainless steel handle, and threaded ends per ANSI B2.1.

B. Large Ball Valves (4” and Larger)

General Provide metal to metal seated ball valves with flanged ends, drilled to the applicable ANSI B16.1 standard Class 125/150, as required. Valve shall have a clear unobstructed waterway, which will result in no significant head loss, when the valve is in the full open position.

The valve shall be drop tight and meet or exceed the AWWA C-507-99 inspection and testing standard. The valve shall be single seated, as required and rated at 150 psi.

Manufactures

Henry Pratt Company.

Apco Willamette.

Engineer approved equal.

Elements Body

Construct body of ductile iron ASTM A536 GR 65-45-12 having an inlet and outlet flanged waterway equal to the required valve size. Use flat-faced

Standard Pump Station Specifications 33 34 16-7 flanges machined parallel to each other to within .005 inch. Provide valve body with both a drain and vent hole drilled and tapped.

Bearings: Bronze, installed in each half of the valve body accurately located in the center of the housing to receive the trunnion bearings on the ball and place the ball in the central position.

Bearing Load: Maximum of 2000 lb/sq. inch at 250 psi differential pressure.

Body Seat: Monel, electronically fused to the base metal, then accurately machined to form the seating seal, or other C507-99 approved materials. The body seat shall not protrude into the waterway.

Ball

Provide a ductile iron ASTM A536 GR 65-45-12 ball with integrally cast trunnions which will be bronze-bushed. One trunnion holds the operating shaft which passes through a packing seal area and connects to the actuator. To prevent leakage around the shaft, the chevron packing is installed to form a seal.

Ball Seat: Type 300 series stainless steel. Pressure assisted design. Fully adjustable and replaceable in the field without removing the valve from the line. Use an offset on the body and ball so that the seats will only be in contact at the actual point of closing. Connect the seat to the ball by means of a stainless steel mounting ring that is securely attached and pinned into position after the correct setting has been attained. Do not use seats threaded directly on to the ball.

The ball seat shall be located at the top, when the valve is in the open position.

Actuator

Provide valve actuators conforming to the operating requirements of AWWA Standard C507-99. Design actuators to hold the valve in any intermediate position between full open and fully closed without creeping or fluttering.

Where indicated, provide electric valve actuators meeting the requirements of this specification.

Materials Ball and Body Trunnion Bearings: Bronze of dissimilar hardness as per AWWA

C507-99 standard to prevent galling or binding. Self-lubricating teflon reinforced are also acceptable.

Shafts: ASTM A564 Type 630, H1150 (17-4PH) stainless steel.

Valve Testing: Subject all ball valves to hydrostatic, shop leakage and performance tests as specified in AWWA Standard C507-99. Maximum seat leakage allowance of 1fl. oz. per diameter inch per hour as per AWWA C507-99 at the operating pressures indicated in the Valve Schedule.

Internal Valve Painting: Shop paint all internal ductile iron surfaces, except finished or bearing surfaces, with two coats of asphalt varnish conforming to Federal Specification TT-C-494, and AWWA C550.

External Valve Painting: Shop paint all exterior steel or cast or ductile iron surfaces of each valve, except finished or bearing surfaces, with one or more coats

33 34 16-8 Standard Pump Station Specifications of Alkyd primer. For buried service valves, two coats of asphalt varnish per Federal Specification TT-C-494.

Service Provide ball valves suitable for low pressure service while maintaining AWWA leakage limits. Available seating pressure may range as shown in the Valve Schedule at the end of this section depending on the operating status of the associated pump station and the valve must remain leak tight. On initial pump start-up and shut down, the valve may experience pressures up to the high pressures indicated in the schedule prior to opening and closing and shall maintain AWWA leakage standards.

Certification Conduct factory testing to certify the valve meets the AWWA leakage standards at the design operating pressures listed in the Valve Schedule. Video tape the testing with a copy provided to the Engineer and Owner. Prior to the valve being shipped to the project site, provide a signed certification from the manufacturer stating the valve meets the AWWA leakage requirements.

SWING CHECK VALVES

A. Provide oil cushioned, bottom buffer, swing check valves in sanitary piping that are tight seating, cushioned in operation, suitable for operation in either horizontal or vertical piping, and conform to AWWA C508.

B. Provide flush and drain holes in the body.

C. Provide a bronze seat that is locked in place with stainless steel lock screws. Make the seat field replaceable without the use of special tools.

D. Provide a one-piece stainless steel shaft that extends through both sides of the body with a lever and spring mounted on each side.

E. Provide a ductile iron disc, utilizing a double clevis connected to a ductile iron disc arm.

Provide a replaceable Buna-N disc seat for water tight shut-off. Suspend the disc arm assembly from the stainless steel shaft.

F. Provide a bottom hydraulic (oil cushioned) buffer to permit free open and positive non-slam control closure of the disc. The hydraulic buffer shall make contact with the disc during the last 10% of closure to instantly control the valve disc until shut-off in a manner

Standard Pump Station Specifications 33 34 16-9 to prevent slam and water hammer. Provide external adjustment on the buffer so the last 10% of closure can be controlled to suit operating conditions.

G. Materials of Construction

Body/Cover: ASTM A126, Grade B, cast iron.

Disc arm/Disc: ASTM A536, ductile iron.

Seat: ASTM B148 aluminum bronze.

Shaft: ASTM A582, T303 stainless steel.

Disc Seat: Buna-N.

Buffer Cylinder: Steel, per NFPA Standards.

Buffer Rod: ASTM A582, T303 stainless steel.

H. Manufacturers

Dezurik (Apco-Willamette).

GA Industries.

Engineer approved equal.

SEWAGE AIR RELEASE VALVES

A. Manufacturers

Vent-O-Mat Series RGX.

Engineer approved equal.

B. Materials

Provide Air Release and Vacuum Relief Valves consisting of a compact tubular all stainless steel fabricated body, hollow direct acting float, and solid large orifice float in H.D.P.E.- stainless steel nozzle and woven dirt inhibitor screen, nitrile rubber seals and natural rubber seat.

Include an integral anti-surge orifice mechanism, which operates automatically to limit surge pressure rise or shock induced by closure to less than 2 times the valve rated working pressure. Provide an intake orifice area equal to the nominal size of the valve (i.e., a 6” valve shall have a 6” intake orifice).

Provide large orifice sealing with the flat face of the control float seating against a nitrile rubber “O” ring housed in a dovetail groove circumferentially surrounding the orifice. Control discharge of pressurized air by the seating and unseating of a small orifice nozzle on a natural rubber seal affixed into the control float. Prevent damage to the rubber seal using a flat seating land surrounding the orifice.

The valve construction shall be proportioned with regard to material strength characteristics, so that deformation, leaking or damage of any kind does not occur by submission to twice the designed working pressure. Provide flanged ends conforming ANSI Class 250 or ANSI Class 300 Standards for the valve inlet connection. Fasten flanged ends with ASTM A193,Grade B8M, 316 stainless steel, heavy hex bolts and ASTM A194, Grade 8M, 316 stainless steel, heavy hex nuts inserted for alignment to the specified size of, nuts, washers, and gaskets.

C. Operation

Prior to the ingress of liquid into the valve chamber, as when the pipeline is being filled, and when sewage/effluent approach velocities are relative to a transient pressure

33 34 16-10 Standard Pump Station Specifications rise, on valve closure, of < 2-times valve rated pressure, vent air through the large orifice.

At higher sewage/effluent velocities, which have a potential to induce transient pressure rises greater than 2-times valve rated pressure on valve closure the automatically discharge air/gas through the anti-shock orifice and reduce sewage/effluent approach velocity, so that on closure a maximum transient pressure rise of less than 2-times valve rated pressure is realized.

Valves shall not exhibit leaks or weeping of liquid past the large orifice seal at operating pressures of 7.3 psi to twice (2) the rated working pressure.

When the valve is closed, discharge accumulated air/gas through the small orifice at any pressures within a specified design range, 7.3 psi to 250 psi. No leakage is allowed in the absence of air.

Valves shall react immediately to pipeline drainage or liquid column separation by the full opening of the large orifice so as to allow unobstructed air intake at the lowest possible negative internal pipeline pressure.

EXTENSION STEMS

A. Provide solid steel extension stems not smaller than the stem of the valve. Connect extension stems to the valve by a flexible socket coupling. All couplings shall be pinned, keyed, or socket type.

B. Extend extension stems for buried service valves to within 6” of the top of the valve box or floor box. Provide spacers which will center the stem in the valve box. Provide a standard 2” nut on the top of the extension stem.

C. Provide stem guides that are bronze-bushed, cast iron construction adjustable in two directions. Install stem guides so the unsupported length of the extension stem does not exceed 10 feet or an L/r of 200.

FLOOR STANDS

A. Provide heavy-pattern type floorstands constructed of cast iron or steel with a height of approximately 36 inches. Provide an integral bottom flange suitable for bolting to a concrete floor.

B. Furnish floorstands for manually operated non-rising stem valves with a slot-type position indicator in the floorstand body. Provide a removable stem cover with slot type position indicator for floorstands for rising stem valves. Stem covers shall consist of a galvanized, slotted steel pipe attached to the top of the floorstand with a pointer riding up and down in the slot. Mark the open and closed points on the pipe cover.

C. Provide a bronze operating nut supported by tapered, grease-lubricated roller or ball bearings on floorstands for rising stem valves. Provide positive mechanical seals on the operating nut where it passes through the floorstand housing to retain lubricant and exclude dirt. Provide a lubricating fitting for lubricating bearings.

D. Provide handwheels with a minimum diameter of 14 inches and shall be designed to seat or unseat the valve at the maximum differential with not greater than a 40-pound tangential pull on the handwheel rim. Cast an arrow and the word "OPEN" on the handwheel in raised letters.

E. Provide a conspicuous, permanently attached nameplate showing the valve manufacturer's name, valve size, model designation, serial number, and any other pertinent information on

Standard Pump Station Specifications 33 34 16-11 the floorstand. Fabricate the nameplate of corrosion resisting metal with raised or stamped lettering and contrasting background.

F. Set floorstands vertical and plumb with the valve operating stem for free operation without binding or distortion. Shim and grout floorstand in place as required for proper installation.

G. Following manufacture, interior and exterior, non-machined, nonbearing ferrous floorstand surfaces shall be blast-cleaned and painted at the factory with 1 coat of zinc chromate primer conforming to Federal Specification TT-P-645 and 1 coat of compatible alkyd enamel. Protect interior surfaces of floorstands for the life of the unit with a minimum of 3 coats of an approved paint.

VALVE BOXES

A. Provide all buried valves with 3-piece, cast iron, extension sleeve type valve boxes suitable for the depth of cover as shown on the Drawings.

B. Material Characteristics

Minimum Diameter: 5 inches.

Minimum Wall Thickness: 3/16” at any point.

C. Cast thereon an appropriate name designating the service for which the valve is intended on the cover (“W” for water, “S” for sanitary).

D. When installed within a roadway, provide deep locking type covers.

E. Heavily coat all parts of valve boxes, bases, and covers with a suitable bituminous finish.

F. Set valves and valve boxes plumb. Place each valve box directly over the valve it serves with the top of the box flush with the finished grade.

MANUAL VALVE OPERATORS

A. Unless otherwise shown or specified, furnish plug valves with manual operators as follows:

Plug valves 8” and smaller that are installed above grade and less than 7 feet above the working surface: Lever operator.

Plug valves greater than 8” that are installed above grade and less than 7 feet above the working surface: Rotary operator with handwheel.

Plug valves located more than 7 feet above the working surface: Rotary operator with chainwheel.

Plug valves 8” and smaller that are installed for buried service: 2” operating nut, extension stem, and valve box.

Plug valves greater than 8” that are installed for buried service: Rotary operator with extension stem, 2” operating nut, and valve box.

B. Operating Nuts for Buried Valves: Standard 2” square nuts conforming to AWWA C500.

Furnish extension stems, valve boxes, and stem guides where shown, specified, or required for proper operation.

C. Hand Lever Operators: Heavy-duty cast iron bracket, cast iron latching lever, and self-lubricating bushings, capable of securing the valve in any position. Install lever operators so that the lever is parallel with the axis of the pipe in which the valve is installed when the valve is fully open.

D. Rotary Manual Operators for Aboveground Service: Worm gear or traveling nut type with a heavy-duty, weatherproof cast iron or steel housing with gasketed, removable cover.

Equip with a mechanical dial or slot type position indicator and suitable hand wheel.

33 34 16-12 Standard Pump Station Specifications

Provide totally enclosed and sealed manual operators to prevent the entrance of rain, dirt, and corrosive atmospheres. Provide traveling nut operators with a grease lubricated alloy steel screw stem, brass nut, and self-lubricating bronze bushings. Provide worm gear operators with hardened, grease-lubricated alloy steel worms and bronze worm gears.

Provide bronze or stainless steel exterior bolts and fasteners for corrosion resistance. The valve shall open with counterclockwise rotation of the handwheel.

E. Rotary Manual Operators for Buried Service: Conform with the paragraph above except, provide totally enclosed and completely sealed operator to prevent the entrance of water and dirt. Coat buried operators with a bituminous coating. Capable of withstanding 300 foot-pounds of torque on the operating nut or hand wheel. Provide a corrosion resistant, dial type valve position indicator at the operating nut on the extension stem of the buried operators to provide a remote indication of valve position.

F. Chain Wheel Operators: Heavy cast iron construction equipped with chain guide and looped, flexible, operating chain. Provide galvanized or cadmium plated chain that extends to with 48-inches of the floor.

G. Provide manual rotary and lever operators capable of seating or unseating the valve disc under the most adverse conditions in the particular application with no more than an 80-pound pull on the handwheel or lever. Provide valve operators capable of holding the valve in any position between fully open and fully closed without creeping or fluttering. Provide operators with adjustable, mechanical, stop-limiting devices to prevent over-travel of the valve disc in the open and closed positions. Comply with all applicable requirements of

AWWA C504.

H. Coordinate the location of valve operators. Clearly show operator locations for each valve on the shop drawings.

ELECTRIC VALVE ACTUATORS

A. Provide open/close service or modulating service electric actuators as specified in the Valve Schedule at the end of this Section.

B. Manufacturers

Open/Close (non-modulating) fail-open valve actuators: Beck, Limitorque, Rotork or Engineer approved equal.

Modulating, Failsafe valve actuators: Beck, Limitorque, Rotork or Engineer approved equal.

C. Actuator Sizing

Size the actuator to guarantee valve closure at the specified differential pressure.

Provide sufficient safety margin of motor power available for seating and unseating the valve to ensure torque switch trip at maximum valve torque with the supply voltage 10% below nominal.

D. Motor

The drive shall be furnished with a 460 volt AC, three phase, 60 Hz, synchronous motor. Motor shall be capable of withstanding 60 starts / stops per minute or a temporary stall condition without overheating. Design of the motor shall be such that electrical and thermal overloads are not required.

Motor bearings shall be maintenance-free. Motor shall be non-coasting with instant magnetic braking, and shall be self-locking and selfreleasing without the use of a separate brake winding, mechanical brake or worm gear mechanism. Control drive shall be designed to stay in place upon loss of power and shall be capable of holding a

Standard Pump Station Specifications 33 34 16-13 load equal to at least 200% of the model’s rated output without AC power. The drive motor shall be a TENV with Class H insulation.

Drive shall be equipped with a contactless position sensing device and be capable of providing an isolated feedback signal with a 4–20 mA or 1–5 V dc range. The sensing device shall have infinite resolution.

Control drive shall have integrated electronics and be able to operate in ambient temperatures of -40°F. (-40°C.) to 185°F. (85°C.).

Include a device to ensure that the motor runs with the correct rotation for the required direction of valve travel with either phase sequence of the three-phase power supply connected to the actuator.

E. Failsafe Operation

For valves requiring failsafe operation, provide an actuator with a battery backup power source, to ensure, that in the event of a main power supply loss or failure, the valve can respond, as user configured, to automatically open, automatically close, or stay in last position waiting for local or remote control command within a 30 minute period of power loss. Provide a display on the battery backup power source to indicate battery status.

Independent of power loss, the actuator shall be able to ensure that the valve can respond as user configured, to automatically open, automatically close, or stay in last position, in the event the process control input signal is lost.

F. Hand Operation

A low-speed, disc-type motor Handwheel shall permit manual operation of the drive without electrical power and without a declutching mechanism

G. Toque and Turn Limitations

Control drive shall be rated for the torque output required for the specific valve or gate application. Stall torque shall be self-limiting, not exceeding two and one half times the rated torque; torque switches shall not be required. Drive shall operate as required for the specific valve application on increasing signal, with timing of up to 60 seconds for 100° rotation. Gear train shall have high efficiency spur gears constructed of heat treated alloy steel or ductile iron only. Readily available gear modules shall provide for a range of torque and timing combinations within the drive’s rated capacity and shall be field interchangeable. Drive train parts shall be lubricated with a premium, heavy-duty lithium-based lubricant. No oil baths shall be used for lubrication. Control drives shall be able to operate in any mounting orientation.

Two SPDT over-travel limit switches shall be provided for over-travel protection. In addition, the drive shall have four auxiliary SPDT switches which are infinitely adjustable over the full range of travel. Switches shall be rated for 6 amps at 120 volts AC. Drive shall have integral mechanical stops capable of limiting travel of the drive and load.

H. Local Operation

A five-position, drive-mounted electric Handswitch shall be provided to permit local electrical operation of the unit for control adjustment or operation on loss of control

33 34 16-14 Standard Pump Station Specifications signal. With the Handswitch in AUTO mode, drives shall respond to control signals automatically.

I. Control Facilities

Drive shall provide modulating control through an integral, digital control module which positions the drive in proportion to the 4-20 mA range control input signal.

The control module shall be capable of initiating shaft movement in steps down to 0.1°.

Upon loss of input signal, the drive shall be field configurable to move to any…