Amendment 1_rdw.pdf

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers is extended. is not extended.

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 items 8 and 15, and returning 1 copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or electronic communication which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT 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 letter or electronic communication, provided each letter or electronic communication makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NUMBER AS DESCRIBED IN ITEM 14.

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

NUMBER IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation data, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

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

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

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

15B. CONTRACTOR/OFFEROR

(Signature of person authorized to sign)

15C. DATE SIGNED 16B. UNITED STATES OF AMERICA

(Signature of Contracting Officer)

16C. DATE SIGNED

Previous edition unusable STANDARD FORM 30 (REV. 11/2016) Prescribed by GSA FAR (48 CFR) 53.243

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

2. AMENDMENT/MODIFICATION NUMBER

PAGE OF PAGES

5. PROJECT NUMBER (If applicable)

6. ISSUED BY

FDA/OO/OFBA/OAGS/DAP

OAGS - Field Operations Branch

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

ATTN: Roosevelt Walker 39000 NCTR Road, Bldg. 50, Rm. 432 Jefferson AR 72079

8. NAME AND ADDRESS OF CONTRACTOR (Number, street, county, State and ZIP Code) 9A. AMENDMENT OF SOLICITATION NUMBER

ALL OFFERORS

75F40120R00024

9B. DATED (SEE ITEM 11)

06/15/2020

10A. MODIFICATION OF CONTRACT/ORDER NUMBER

10B. DATED (SEE ITEM 13)

CODE FACILITY CODE

(X)

4. REQUISITION/PURCHASE REQUISITION NUMBER

1224382

3. EFFECTIVE DATE

07/09/2020

1. CONTRACT ID CODE

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

The purpose of the amendment is to :

1. Provide the Pre-Proposal Conference/Site Visit Minutes. *Attachment 1.

2. Provide answers to questions. *Attachment 2.- *No other questions will be entertained.

3. Well Drilling and Casing addendum 1- *Attachment 3

Attachment 1 ‐ Pre‐Proposal Conference/Site Visit Minutes NCTR ‐ New Water Well

75F40120R00024

June 30, 2020

Attendees:

Contractors – 5 Everett Burge/Layne Christensen Company, Dennis Denson / AVCOR Construction & Consulting, LLC, Jessie Windemaker /CWR Construction, Inc. ,Logan Scherm/Layne Christensen Company, Chris Powers / AVCOR CC Government Employees - 3 Roosevelt Walker, Contract Specialist, OAGS Jennifer Johnson, Contracting Officer, OAGS Carl Mcqueen, Project Officer/Contracting Officer Representative (COR), Division of Engineering

Objective:

On June 30, 2020 Contract Specialist (Roosevelt Walker), convened the site visit meeting at 9:15 am Central Standard Time (CT).

A general overview of the solicitation was conducted by Mr. Roosevelt Walker, including a review of sections B, L, and M of the solicitation including: Summary of requirement, NAICS code, requirement magnitude, proposal submission instructions, and evaluation factors. Dates to reminder were also covered:

1. Question Submission Deadline: July 07, 2020, by 12:00 pm CT.

2. Proposal submission deadline is July 15, 2020, 12:00 pm CT.

A technical overview of the solicitation was conducted by Carl Mcqueen including:

Specifications, work phases, and drawings. Carl Mcqueen (COR) and Roosevelt Walker (CS) then conducted a site walk through.

The proposal conference/Site Visit adjourned at 12:15 am CT.

Attachment 1

FDA Responses to Questions

Electrical:

1. On sheet E2, says to Furnish and install new panel "DP", we assume this is a typo, and should read "PP". Please confirm.

Government Response:

Refer to drawing E2. Change the name of Panel "DP" to Panel "PP".

2. On sheets E2 and E3, there is a discrepancy on the feeder size from Panel PP to the VFD.

Please clarify the proper conduit/conductor size required.

Government Response:

Refer to drawing E2. Change the feeder from Panel "PP" to the VFD from F250 to F200.

3. On sheets E2 and E3, there is a discrepancy on the feeder size from the VFD to the Pump disconnect. Please clarify the proper conduit/conductor size required.

Government Response:

Refer to drawing E2. Change the feeder from the VFD to the pump disconnect from "V150 H +" to "V100 H+"

4. Please provide the conduit/conductor sizes for the feeder from the existing panel to the new panel "PP"

Government Response:

Refer to drawing E3. Change the feeder from Panel "PP" to the existing step down transformer from "1 F4" to "1 F40".

5. Will the "VFD Cable" be required to extend from the Well disconnect to the pump? The one line only shows it from the VFD to the Disconnect.

Government Response:

Refer to drawing E3 and add the following Note: "VFD cable shall extend from the VFD complete to the pump. Following manufacturer recommendation for terminations around the disconnect."

6. The drawings appear to depict that the separate 1" conduit shown with the (2) #14's in it is for the "INHIBIT" line shown on the one-line. Please advise as to what this “inhibit” line is for.

Government Response:

Correct, this will function as the inhibit contact to disable the VFD.

Page 1 of 5Attachment 2

Plumbing & Water Utility:

1. The Section A-A detail on Page 4 shows a flange and a 10” gate valve with handwheel however the handwheel and gate valve are missing from the “Well Detail” drawing on the same page. Please confirm if the well head should have this gate valve between the pump head and the air release valve prior to the blind flange.

Government Response:

Yes, the well head should have a gate valve between the pump head and the air release valve prior to the blind flange.

2. The existing well has a basket strainer between the flow meter and the 38” spool. The current detail does not reflect a basket strainer upstream of the flowmeter. Does NCTR want to match the existing well head and install a basket strainer on this new well?

Government Response:

Yes, match the existing well head and install a basket strainer.

Architectural:

1. There are pipe stands supporting the well pipe at the other well site on campus.

Underneath the pipe stand the concrete pad is extended to support them. The current concrete plan is for a 10x10 pad, but the existing well shows an appx 10x10 plus an additional 3x8 (appx) add-on that runs underneath the pipe to support the pipe stand.

NCTR stated that they want the new to match the existing. Does NCTR want to mirror this location and add the extra concrete to support a pipe stand?

Government Response:

NCTR would like to mirror this location and add the extra concrete.

2. The existing well head has the concrete pad around three sides of the base. The base is offset from center, however the plans in the new well head show the 10x10 pad slightly offset to the east and not touching the well head base at all. The “Well Detail” on page 4 shows the well base to be built up and sloped with 6” gravel from 267’ to 266’. It was mentioned that NCTR wants to match the other well layout, but this plan is significantly different and the two details on page 4 differ then what was mentioned at the site visit.

Does NCTR want the contractor to put the 10x10 pad adjacent to and touching the pump foundation as it does at the other site or construct it as it is drawn? It would make sense to match the other site and it would also help stabilize the ground and provide a clean and stable work area around the pump head for future maintenance. It will also help cut down on weeds and vegetation growing through the gravel.

Government Response:

Put the 10x10 pad adjacent to and touching the foundation as it does at the other site.

3. The pipe support shown on Page 4, both details, reflect a concrete pipe support and section A-A reflects a concrete pipe support and also a steel pipe support. However, the existing pipe support at the other well is a steel pipe with a threaded rod for vertical adjustment. Does NCTR want to match the existing well head (excluding the ladder), construct a concrete pipe support, or both?

Government Response:

Match the existing well head.

4. Page 4, Well Detail, shows the subgrade base/width of the pump foundation (5’ from the top) to be 10’ wide. The drawing shows the top of the foundation to be 5’ wide. The existing pump base at the other well head is appx 5’ wide at the base and tapers to appx 4’ at the top. A 10’ wide pump base is not logical. This may be misconstrued to be the 10’x10’ pad but it is hard to tell. The well contractor stated that the state requirement for the base of the casing was to be 2’ wider on each side of the pipe. In this case, the pipe is 16”, thus making the total required width of the foundation base to be 5’4”x5’4”.

The well contractor stated that the total width at the top of the foundation block was typically 1’ less, thus making it 4’4”x4’4”. These measurements would match the existing well already on campus. Please confirm NCTR’s intent as to the width of the pump head foundation block at the base and also the tapered width at the top.

Government Response:

The width of the base of the foundation should be 5’4”x5’4” and the width of the top of the foundations 4’4”x4’4”.

5. Will NCTR please add to the drawing packet and provide a detailed look down view drawing to show how they would like to see the pump head foundation block laid out in relation to the 10x10 pad and also the electrical disconnect box with the associated concrete foundation underneath the disconnect. The google earth imagery with detail layover is lacking sufficient information to derive this layout plan.

Government Response:

No.

6. Will NCTR please provide a suitable rebar layout/design for the pump head foundation block?

Government Response:

#5 bars @ 12 O.C.E.W. with 3” minimum cover

7. The Paint Specification, para 2.2 B, Cementitious Materials - refers to painting of concrete. Does NCTR want the concrete splash blocks, pipe supports, slabs, and well head foundation to be painted?

Government Response:

No, do not paint these surfaces.

8. The Paint Specification, para 2.3A Paints, numbers 1-14, refer to a series of coatings.

This specification is very confusing. Does NCTR want these coatings to be performed in the field or is this what NCTR expects how the pipes should be shop coated? Is the contractor to use ALL, SOME, or NONE of these coatings? Will NCTR please provide more specifics as to the intent of this section?

Government Response:

Please see revised specification. Refer to Section 3.1.A “Painting Schedule” for coating specifications.

9. Section 09901, Painting Schedule, para 3.1A – this schedule refers to shop coats and field coats. However, items 9-16 do not appear to apply to this project. Will NCTR please clarify this?

Government Response:

These items do not apply to this project.

10. Does NCTR want the contractor to paint the inside of the existing building using the paint schedule in items 9-16 para 3.1A?

Government Response:

No, do not paint the existing building. Please see revised specification.

11. Section 09901, Painting Schedule, para 3.1A – this schedule refers to shop coats and field coats. Items 1-9 appear to apply to this project and the schedule randomly refers to XX coats of (F), xx coats of (h), xx coats of (l), etc… However, none of these letters are identified anywhere in the schedule. Should this schedule be identifying the types of paint in paragraph 2.3A numbers 1-14? If so, will NCTR direct the A&E to correct this? If not, will NCTR please direct the A&E firm to clarify this paint schedule, remove what does not apply to this project, and be more specific as to what exactly the contractor should be providing?

Government Response:

Please see revised specification.

12. Section 09901, Painting Schedule, para 3.3A – this schedule refers to finish colors. Will NCTR please instruct the A&E to clarify how these colors apply to this project and please expand on the schedule to identify how, where, and during what phases of construction these paints should be applied, what thickness, how many layers, etc.

Government Response:

Color to match existing well.

13. Does NCTR want the entire 50’x40’ area inside the security fence to be scraped to native soil and backfilled with 6” of SB-2 rock? If so, does NCTR want the soil in this area to be treated with Herbicide and possibly a layer of weed fabric to prevent future weed and vegetation growth?

Government Response:

Do not backfill soil with SB-2 or treat the soil with herbicide.

14. Will NCTR issue a two-week proposal date extension following RFI answers being posted?

Government Response:

No.

- 1 - 18-5787 02520 7/6/20 Well Drilling and Casing

Addendum No. 1

SECTION 02520

WELL DRILLING AND CASING

PART 1. GENERAL

1.1 SECTION INCLUDES

A. Drilling Mud.

B. Well Gravel.

C. Well Screen.

D. Blank or Inner Casing.

E. Well Casing.

F. Neat Cement Grout.

G. Well Hole.

H. Pump Foundations.

I. Disinfection.

J. Production Test.

1.2 RELATED SECTIONS

A. Section 02522 - Well Pump and Motor.

1.3 REFERENCES

A. American Water Works Association, 6666 West Quincy Avenue, Denver, Colorado 80235.

1. AWWA A100-15 - Standard for Water Wells.

1.4 SUBMITTALS

A. Provide the following submittals in accordance with Section 01001:

1. Electric resistivity log (Schlumberger or an approved equal method).

2. Gama log.

Attachment 3 Well Drilling and Casing addendum 1

- 2 -

7/6/20 Well Drilling and Casing

Addendum No. 1

1.5 GUARANTEE

A. Contractor shall guarantee for a period of 12 months after acceptance of well that the bacteriological quality of the water will be acceptable to the Arkansas State Board of Health for domestic use.

PART 2. PRODUCTS

2.1 DRILLING MUD

A. Should drilling mud be necessary, a commercial NSF approved bentonite-type shall be used during the drilling operations. The viscosity of the mud shall be sufficient to carry the heaviest drilled material to the surface. No organic-type drilling mud shall be allowed.

2.2 WELL GRAVEL

A. Gravel: Sound, durable, rounded particles of natural gravel, free from flat or elongated particles, organic matter, or other deleterious material.

B. Introduce gravel into well slowly and evenly around circumference in order to avoid bridging or displacement of inner casing.

C. Use a tremie or similar method to place gravel to prevent segregation of gravel material.

D. Place gravel filter around screen.

E. Fill the space between blank extension of screen and the 12-inch diameter casing with the same material for a minimum distance of 50 feet up into the 12-inch diameter casing.

2.3 WELL SCREEN

A. Manufacturer: Johnson Screen; Roscoe-Moss; or approved equal.

B. 18-8 stainless steel, A.1.5.a, Type 304, with 0.030 inch openings.

C. Minimum 8-inch diameter.

2.4 BLANK OR INNER CASING

A. Not less than 100 feet of 8-inch I.D. blank casing.

- 3 -

7/6/20 Well Drilling and Casing

Addendum No. 1

B. Same material as screen.

2.5 WELL CASING

A. Wrought iron or black steel pipe.

B. If joints are to be threaded and coupled, use only long recessed couplings.

C. Minimum Inside Diameter: 12 inches

D. Length: Approximately 875 feet.

E. Minimum Thickness: 0.375 inch.

2.6 CEMENT GROUT

A. Mix at site.

B. The neat cement grout material shall consist of a slurry mixture of Portland Class A Cement and water in a ratio of six (6) gallons of water per ninety-four (94) pound sack of cement and shall have a minimum slurry weight of fifteen (15) pounds per gallon.

PART 3. EXECUTION

3.1 WELL SCREEN

A. Penetrate water-bearing sand strata with at least a 28-inch hole throughout its entire depth by hydraulic under-reaming.

B. Place throughout water-bearing formation not less than 90 feet of screen.

C. Properly seal and plug bottom of screen with a plate or back-pressure valve.

D. Properly center and guide screen in large diameter hole.

3.2 BLANK OR INNER CASING

A. Install on top of well screen.

B. Lap up into well a minimum of 50 feet.

C. Properly center by locating centering guides as required.

- 4 -

7/6/20 Well Drilling and Casing

Addendum No. 1

3.3 WELL CASING

A. Joints may be threaded and coupled only if long recessed couplings are used.

B. Properly center by locating centering guides as required so as to provide a 2-inch annular space between casing and wall of drilled well hole.

3.4 CEMENT GROUT

A. Fill 2-inch annular space between well casing and well wall with neat cement grout the entire depth.

B. Mixing and pumping shall be a continuous operation until the grout has filled the entire annular space.

C. The space shall be considered to be filled when the grout that is pumped downward through the temporary piping actually appears at the surface of the ground on the outside of the casing.

D. Pump grout to bottom of hole under pressure through a separate temporary pipeline using the Halliburton method, or approved equal.

E. Allow to set at least 72 hours before any further drilling operations are performed.

3.5 WELL HOLE

A. Drill to a depth of approximately 971 feet.

B. 16-inch minimum diameter.

3.6 PUMP FOUNDATION

A. Concrete: 3,000 psi at 28 days.

B. Slope to sides.

C. Chamfer surfaces and rub or trowel smooth.

D. Top of pump foundation shall extend at least 4 feet above natural ground elevation.

E. Well casing shall extend at least 1 inch above the pump foundation.

- 5 -

7/6/20 Well Drilling and Casing

Addendum No. 1

3.7 DISINFECTION

A. Maintain chlorine residual in drilling fluid at all times.

B. Upon completion of well, a sufficient amount of free chlorine shall be introduced in the well and pump so as to produce sterile water.

C. Disinfection procedures shall conform to AWWA C654-97.

D. Send samples, taken on two consecutive days, to the Arkansas Department of Health for bacteriological analysis.

E. Send samples, taken on two consecutive days, to the Arkansas Department of Health for chemical analysis.

F. Field sampling will be performed by the Arkansas Department of Health upon Contractor's request.

G. Give Engineer copies of results of all samples.

3.8 PRODUCTION TEST

A. Provide testing and measuring devices.

B. Test well in presence of Engineer for a period of 8 hours after complete installation and full development of pumping equipment and well.

C. Adjustment stops of no longer than 1 hour will be permitted during the production test.

D. The capacity of the well shall be demonstrated to be approximately 800 gpm, measured at the discharge flange of the pump.

E. The amount of water flowing from the pump shall be measured by an orifice test.

END OF SECTION

18-5787 02522 7/6/20 Well Pump and Motor

Addendum No. 1

SECTION 02522

WELL PUMP AND MOTOR

PART 1. GENERAL

1.1 SUMMARY

A. Provide verticle turbine pump and motor as specified and shown in the well drawings.

1.2 RELATED SECTIONS

A. Section 01001 – Basic Requirements

B. Section 02086 – Manual Operated Valves.

1.3 REFERENCES

A. American Society for Testing and Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103.

1. ASTM A48 - Specification for Gray Iron Castings.

2. ASTM A53 - Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-

Coated Welded and Seamless.

3. ASTM AI20 - Specification for Pipe, Steel, Black and Hot-Dipped Zinc-

Coated (Galvanized) Welded and Seamless, for Ordinary Uses.

4. ASTM Al93 -Specification for Alloy-Steel and Stainless Steel Bolting Materials for

High-Temperature Services.

1.4 SYSTEM DESCRIPTION

A. Service Conditions:

1. Liquid Pumped: Clean Water

2. Largest Solid Passed: ½-inch Sphere

3. Specific Gravity: 1.0

1.5 SUBMITTALS

A. Provide the following submittal in accordance with Section 01001:

1. Performance data curves showing head, capacity, horsepower demand, pump efficiency, and NPSH (required) over entire operating range of pump, from shutoff to maximum capacity.

2. Equipment manufacturer shall indicate separately: head, capacity, horsepower demand, and pump efficiency at guarantee points.

3. Performance requirements: As defined in Hydraulic Institute Standards.

7/6/20 Well Pump and Motor

Addendum No. 1

4. Provide complete motor nameplate data, as defined by NEMA, motor manufacturer; and any motor modifications.

PART 2. PRODUCTS

2.1 MANUFACTURERS

A. Layne.

B. Fairbanks-Morse.

C. Or equal.

2.2 TURBINE PUMPS

A. Capacity: 800 GPM @ 380’ TDH.

B. 100 HP, VHS, 460volt, 3 phase, 60 cycle, high efficiency, non-overloading, across the line start. Motor shall be inverter Duty Rated with variable frequency drive. The variable frequency drive shall include a bypass. Refer to electrical specifications.

C. Maximum Pump Speed: 1,760 RPM

2.3 MATERIALS

A. Manufacturer's standard stainless steel unless otherwise specified.

B. AISI, ASTM, etc., numbers, types, and grades specified are typical of material composition and quality. Equivalent materials will be considered.

C. All materials in contact with water shall be NSF/ANSI Standard 61 drinking water approved

2.4 PUMP COMPONENTS

A. Discharge Head:

1. The discharge head shall be a heavy duty type manufactured of ASTM A48, Class 30B cast iron or ASTM A53, Grade B fabricated steel designed for above ground discharge of sufficient strength and rigidity to support the motor mounted on it and carry the weight of the column assembly, pump bowls and suction pipe suspended from it. The discharge flange shall be faced and drilled to match ANSI Class 150 steel flange connections. The discharge flange shall also have a ¼ inch (¼") NPT pressure gauge connection. The head design shall permit the motor drive shaft to be coupled above the tension bearing to

7/6/20 Well Pump and Motor

Addendum No. 1 facilitate easy removal and replacement of the driver. A cast iron tension box designed to maintain proper tension in the oil tubing at all times when locked into position with a hex head cap screw shall be provided with a grooved bronze tension bearing. A lubricator operated by an electric solenoid, with a sight drip feed, and a minimum four (4) quart SAE 329 aluminum oil reservoir shall be provided. The bottom face of the discharge head shall be fully finished.

A separate, fully finished, cast iron or steel base plate shall be furnished with each pump so designed as to permit the extension of the well casing up into the base plate at least ¾ inch (¾"). The base plate shall be permanently grouted into the concrete foundation. The top of the discharge head shall be of the same diameter as the base of the motor. The discharge head will be designed to withstand the pressure produced by the pump at shut off head as the pump may be operated against a closed valve.

2. The motor drive shaft shall be the same diameter as the line shaft and shall be manufactured of AISI C1045 carbon steel. The drive shaft will be furnished with a ASTM B16M Alloy C360 brass adjusting nut. The coupling to connect the motor drive shaft to the line shaft shall be manufactured of AISI C1045 carbon steel and the O.D. of the coupling shall be machined.

3. The discharge head shall be equipped with a properly sized screened air vent in order to vent the well casing.

B. Column Assembly:

1. The discharge column to be furnished under these specifications shall be steel

ASTM A53, Grade B electric weld prime line pipe. The discharge column shall be furnished in interchangeable sections ten (10) or twenty feet (20) in length with exception of the top and bottom sections which shall not exceed ten (10) feet.

The upper end of bottom and intermediate column pipe sections shall be fitted with a coupling of ASTM A536 Grade 65-45-12 ductile cast iron. The coupling shall have an integrally cast stabilizing spider. Each spider shall be faced parallel to permit the ends to butt against the machined faces of the column pipe. The pipe shall have the ends machined eight (8) threads per inch with a 1/8 inch taper and faced parallel to permit the ends to butt against the machined surfaces of the cast alignment spiders. Oil resistant synthetic rubber bushings shall be fitted in each alignment spider for stabilizing and supporting the oil tubing. The top column section shall be factory machined and fitted for connection to the pump head in a satisfactory manner so that no cutting or machine work in the field will be required to properly set the oil tubing. The “drop-in” or rubber “black widow” type of aligning spiders will not be acceptable. Only with flanged connected column pipes are “black widow” type aligning spiders acceptable.

2. Column pipe for the well pump shall be 8 inches O.D. with a minimum wall thickness of 0.277 inches. The oil tubing shall be 2-1/2 inches O.D. The minimum size shaft shall be 1-1/2 inches O.D.

3. Pump settings with more than 25 sections of column assembly must be furnished with an adjustable top column flange and lock ring. For deep (500

7/6/20 Well Pump and Motor

Addendum No. 1 feet+) setting pumps, the Engineer shall be furnished with six (6) certified copies of factory calculations on column and shaft stretch for all possible pump operating conditions from a closed valve to open discharge at the pump head.

C. Shaft Enclosing Tube:

1. The shaft enclosing tubing to be furnished under this specification shall be of a sufficient diameter to provide adequate lubrication under any operating conditions. The enclosing tube shall be black steel, schedule 80, ASTM A120 Grade B continuous weld prime line pipe. Both ends of each tubing length shall be bored, faced, and inside threaded with a Class A thread. The ends of the tubing shall be square with the axis and shall butt to insure accurate alignment.

The lengths shall be interchangeable with the exception of the top section which shall be designed for applying proper tension to the tubing. The interchangeable tubing shall be of such overall assembled length to properly match the length of the discharge column.

D. Line Shaft Bearings:

1. The line shaft bearings which serve as couplings for the shaft tubing shall be spaced at each tubing length, to maintain alignment of pump shafting and to prevent excessive vibration. They shall be cast of continuous cast bronze alloy, equivalent to ASTM B584 Alloy C903, machined, threaded and grooved for proper lubrication.

E. Line Shaft:

1. The line shaft shall be of AISI C1045 steel ground and polished with a surface finish not to exceed 40 RMS. It shall be of ample size to operate the pump without distortion or vibration and shall be capable of carrying the maximum horsepower that may be generated by the motor. The butting ends shall be machined, faced and recessed square to the axis of the shaft. To insure accurate alignment the shaft shall be straight within 0.006 inches total indicator reading. The ends of the shaft shall be accurately machine threaded for connection. Shaft couplings shall be bored and threaded from solid ASTM A108, Grade B1018 steel bars designed with a safety factor of 1-1/2 times that of the shaft. The threads shall be left hand to tighten during pump operation.

The couplings shall be without vent holes. The length of the shaft shall be such as to match properly the length of the discharge column.

2.5 PUMP BOWL

A. Pump bowls, suction and discharge cases shall be of ASTM B148-97e1, NI AL C95800, nickel aluminum bronze or equivalent without imperfections. For pump sizes 8 inches (8") through l5 inches (15"), the bowl water passages shall be vitra-glass or porcelain enamel coated to provide maximum efficiency and consistency of output.

For pumps 8 inches (8") and larger, the suction case and intermediate bowls shall be fitted with replaceable wear rings of aluminum bronze, ASTM B148 Alloy C954. Wear

7/6/20 Well Pump and Motor

Addendum No. 1 rings shall have the minimum practical clearance to the mating cylindrical surface of the impeller to provide adequate sealing independent of vertical positioning of the impellers. Intermediates and cases shall have bronze sleeve type bushings to support and guide the shaft. Bushing material shall be bronze, ASTM B584 Alloy C89835 Federalloy III. The suction case bearing shall be grease packed with provision for grease circulation from a reservoir in the suction case hub. A sand collar of rubber or bronze, ASTM B584 Alloy C89835 Federalloy III shall be provided to protect the suction case bearing from abrasives in the liquid pumped. The discharge case shall deliver the flow of water with minimum turbulence.

B. The intermediate stages shall be selected to provide the maximum efficiency with least number of stages. Impellers shall be of the enclosed type only; cast of ASTM B148-97e1, NI AL C95800, nickel aluminum bronze or 304 stainless steel, accurately cast, machined, balanced, and filed for maximum efficiency and minimum vibration.

The design shall be non-overloading for the capacity of the motor selected at any point across the full operating range. The impeller shall be securely fastened to the bowl shaft with taper collets of ASTM A582, Type 416 stainless steel. The bowl shaft shall be of sufficient diameter to transmit the pump horsepower with a liberal safety factor and rigidly support the impellers between the bowl and case bearings. The bowl shaft material shall be ASTM A582, Type 416 stainless steel.

C. The pump bowl shall have a minimum operating efficiency of 80 percent (80%) for the design condition of 800 GPM at 380 feet total dynamic head. The length of the discharge column furnished shall be sufficient to provide a minimum of thirty (30') feet of submergence over the pump bowl after the pump has been operated for eight

(8) hours continuously.

2.6 IMPELLER SHAFT

A. Type 416 Stainless steel, supported by combination bronze and rubber bearings located on both sides of each impeller.

2.7 PUMP COLUMN ASSEMBLY

A. Install 320 feet of 8-inch epoxy coated column assembly with ductile iron couplings with ductile integral cast spiders, complete.

2.8 PROTECTIVE COATING

A. After the column pipe, the shaft enclosing tube and the suction pipe sections have been fully machined, the exterior surfaces of these pipe sections and the interior surfaces of the column and suction pipe shall be coated with two (2) or more applications of a two-part epoxy material. The material used in the coating process shall be approved by the NSF and designed for use in potable water systems. Coating shall be Sherwin Williams Hi-Solids Catalyzed Epoxy or equal.

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B. Coating applications will be accomplished in the following steps:

1. Remove all oil, grease or foreign matter by solvent washing or stem cleaning.

2. Sandblast all surfaces to be coated to bare metal using pure silica sand or equal. After blasting, remove all excess sand by blowing down with clean, dry air.

3. Tape all exposed threads with masking tape. Pipe and tubing with machined surfaces must be taped off or otherwise protected to maintain the close tolerances required.

4. Apply a primer coat of epoxy material and allow to cure for at least four (4) hours. The coating should not be applied at a temperature under 60° F.

5. The additional coat or coats should be applied in the same manner to produce a minimum total dry film thickness of eight (8) mils.

6. All cleaning of the pipe and applications of the coating shall be done in a plant, supervised by personnel who have the necessary equipment and experience to apply the coating by the spray process. The resultant coasting shall provide a smooth, even surface, free of wrinkles, holidays, pinholes or other blemishes.

2.9 SPECIAL TOOLS FOR PUMPS

A. Complete set of any special tools required to dismantle pump.

2.10 ANCHOR BOLT SIZE AND MATERIAL

A. One-inch minimum stainless steel.

2.11 DRIVE MOTORS

A. General Description:

1. Speed 1760 RPM

2. Horsepower 100 HP

3. Volts 460 volt, operate at 460 volts

4. Phases 3-phase

5. Frequency 60 Hz

6. Service Factor 1.15.

7. Duty Cycle Continuous

8. Insulation Class Manufacture’s Standard

9. Temperature Rise Manufacture’s Standard

10. Coupling Non-reverse

11. Ambient Temperature Rating 40 degrees C.

12. Thrust Bearing Lubrication Manufacture’s Standard Grease

13. Guide Bearing Lubrication Manufacture’s Standard Grease

14. Bearing Life (min.) 50,000 hours rating life as defined by AFBMA standards.

15. Energy Efficiency Label each motor in accordance with NEMA

Standard MGl - 1 253. Nominal efficiency of

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7/6/20 Well Pump and Motor

Addendum No. 1 each motor shall not be less than 90.0 percent minimum printed on nameplate.

Efficiency shall be based on IEEE 112 Test Method B -

16. Controller Variable Frequency Drive compatible

2.12 MOTOR MODIFICATIONS AND ACCESSORIES

A. Screens over all air openings.

B. Contractor to coordinate with Electrical - Low Voltage Motor Control to insure compatibility with part winding starters to be provided. Motor to be VFD compatible.

2.13 MOTOR TEST AND TEST REPORTS

A. Certified copies of test reports on actual motors being supplied shall be provided to Engineer for review.

B. Short commercial tests shall be made on all motors being supplied, including non-load current at rated voltage, rated speed, high potential and locked rotor current.

2.14 DRAWDOWN PRESSURE GAUGES

A. Pressure gages shall have steel case, glass crystal, brass movement, and 1/4-inch NPT lower connection and be a3-l/2-inch gauge size.

B. Supply gauges complete with l/4-inch brass gauge cock.

C. Each gauge shall be factory calibrated and certified

2.15 WATER LEVEL INDICATOR

A. Stainless steel tubing (1/4-inch O.D. minimum) of sufficient thickness with the necessary connections, air valve and air line gauge (calibrated in feet) and a hand air pump shall be furnished for determining static and pumping water levels. The tubing shall extend to the top of the pump bowl and shall be strapped to the column pipe with stainless steel bands and buckles spaced at ten foot (10') intervals. Plastic or PVC tubing will not be permitted.

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2.16 DISCHARGE PIPE

A. The pump discharge piping shall include the following items as shown on the Well Detail plan:

1. Contractor to furnish and install one (1) 8” X 10” Ductile Iron reducer and assorted 10 inch tees, gate valves, check valves, restrained flange adaptors, spools and assorted fittings as indicated and shown on the plans.

2. One (1) 2-inch deep well type air release and vacuum valve with throttling device complete with air discharge piping to discharge in a downward direction.

The end of discharge piping shall be six inches above the ground level and fitted with a stainless steel or bronze strainer.

3. One (1) EBAA Iron Series 10” restrained Flange adaptor or approved equal.

4. One (1) cast iron test tee complete with a blind flange.

5. One (1) flanged spring and lever 10 inch check A-2600-6-Q2, or equivalent valve similar to Mueller A-2600-6-02, or equivalent.

6. Two (2) N.R.S. 10 inch gate valve similar to Mueller A-2380-6 complete with an adjustable pipe supports, or equivalent.

7. One (1) three-quarter inch (¾") smooth-mouth brass sampling cock. A hose bib with threaded outlet shall not be used.

8. Paint all above ground pipe work with two (2) coats of bituminous paint.

9. One (1) water meter as shown on plans and detailed in this specification.

10. Yard piping and tie-in as shown on the plans.

2.17 CHEMICAL CORROSION AND ELECTROLYSIS

A. Contractor shall furnish and install chemical corrosion and electrolysis control to protect both the well casing and the pumping equipment on this project.

B. A sacrificial magnesium galvanic anodes will be placed in moist soil of sufficient depths to provide protection to the metallic equipment. Electrical cable connections will be made from three (3) separate anodes to the well casing, the pump base, and to the pipeline connecting to the pipe.

C. Stray electrical currents may develop in the connecting discharge piping requiring the installation of an electrical isolation flange.

D. The pump column assembly shall be furnished with a protective epoxy coating.

2.18 AIR RELEASE VALVE

A. Contractor to supply a 2 inch air/vacuum release valve. Valve to have 2 inch NPT treaded inlet and outlet.

B. Type: Air/vacuum release valve for high capacity vertical turbine pumps.

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C. Flow Rate: 800 GPM, 1,000 maximum.

D. Function: Air valves for vertical turbine pumps shall vent large quantities of air through the discharge orifice when the pump starts, close tight when liquid enters and permits large quantities of air to re-enter through the orifice when the pump stops to prevent vacuum forming in the pump suction column.

E. Materials: Shall conform to ASTM specifications:

1. Body and Cover Cast iron ASTM A126 Gr. B or Ductile Iron

2. Baffle, 3” Cast iron ASTM A536 Gr. B 65-45-12

3. Float Stainless Steel ASTM A240

4. Seat Buna-N

5. Water Diffuser Brass or Stainless Steel ASTM B16

6. Double Acting Patented

Throttling Device

7. Housing Malleable iron ASTM A47

8. Adj. Screw & Nut Stainless Steel ASTM A276 T304

9. Spring Stainless Steel ASTM A313 T316

10. Plug Teflon AMS 3651

F. Air/vacuum release to mount on a ductile iron 10”x10”x10” tee with a 2” Boss in position G companion flange. Valve shall be fitted with a 2” Schedule 40 galvanized nipples to a 2” brass ball to the air release valve. A 2” galvanized discharge shall carry air and water away from the valve (See drawing) with 24 Mesh Stainless Steel screen over the end of the discharge pipe.

2.19 PUMP DISCHARGE ELBOW AND BASE

A. Close-grain cast iron, minimum 35,000 tensile strength or fabricated steel.

B. Flanges: 125 pound American Standard flanges, faced and drilled.

C. Provide base plate of ample size to carry the complete weight of the suspended parts plus hydraulic load with adequate margin of safety.

D. Provide base plate with eye bolts of suitable size to support the suspended equipment safely during installation and servicing operations.

E. Provide 2 IPS tapped openings to permit installation of airline.

F. Provide screened vent to ensure proper breathing during starting and stopping of pump.

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Addendum No. 1

2.20 MECHANICAL FLOW METER

A. Contractor shall provide and install a flanged 10 inch flow tube mechanical flow propeller type flow meter. The flow meter standard features shall include a magnetically coupled drive, instantaneous flow rate indicator and straight reading, six-digit totalizer.

B. Flow requirements:

1. 125gpm minimum.

2. 1800 gpm maximum.

3. Performance Accuracy: ± 2% of reading through.

C. Mounting requirements:

1. 125 lb. AWWA Class D Flanges.

2. Meter to be installed in a horizontal mount.

3. A straight run of full pipe the length of five diameters ahead and one diameter behind the meter.

D. Materials:

1. All materials shall be NSF/ANSI Standard 61 drinking water approved.

2. Flow tubes are coated with fusion- bonded epoxy.

3. Flow straightening veins.

4. Impellers to be manufactured of high impact plastic.

5. Flow Tube to be mounted with Buna-N rubber gaskets with 7/8 “stainless steel fasteners.

PART 3. EXECUTION

3.1 PUMP AND DRIVER INSTALLATION

A. Install in accordance with manufacturer's recommendations, and as approved.

B. Bolts shall be accurately placed with templates.

C. Coat bolt thread projections with lubricant to facilitate future nut removal.

D. Strain from attached piping shall be eliminated from pumps; and evidence of pump or driver misalignment, noisy operation, or other signs of improper setting shall be corrected by Contractor.

E. Care during storage, installation, and lubrication shall be in strict accordance with manufacturer's recommendations.

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3.2 PERFORMANCE TEST

A. Provide equipment and labor to perform field tests on pump assemblies to demonstrate their conformance to Specifications to the satisfaction of Engineer.

B. A test log shall be presented to the Engineer upon completion of each test that records the following:

1. Flow, in gallons per minute.

2. Pump discharge pressure as measured by calibrated gages, converted to feet of liquid pumped and corrected to pump datum as defined by Hydraulic Institute.

Standards, calculated velocity head at discharge flanges, and total head, all tabulated in feet.

3. For AC motors, driving motor voltage and amperage measured for each phase and 3-phase units.

C. Official Test:

1. When the Contractor has completed the installation of the permanent pumping equipment and has operated it ready for the official acceptance test, the installation shall be tested in the presence of the Engineer for a period of eight

(8) continuous hours. Reasonable stops, not to exceed a total of one (I) hour, for the adjustment of the equipment and measuring devices shall be allowed during this period. The capacity of the pump shall not be less than 800 gallons per minute as measured at the discharge flange of the pump and at a discharge pressure of 40 pounds per square inch, at any time during the test. The amount of water flowing from the pump shall be measured by an orifice test. All temporary testing and measuring devices, not part of the permanent installation, shall be furnished by the Contractor. It shall be the Contractor’s responsibility to provide a means for removing the discharge water away from the well location.

D. Vibration Test:

1. The vibration of the pump and motor installation shall be measured as described herein, using an IRD Model 345 vibration analyzer or equivalent equipment. Background vibration shall first be determined with all equipment at rest. Next, the un-clutched motor vibration shall be determined. The coupled pump and motor vibration shall then be measured. Measurements shall be made at the top of the motor in the vertical plane and both horizontal planes, parallel and perpendicular to the discharge pipe line.

2. The maximum vibration of the coupled pump and motor at the design point on the curve at RPM shall not exceed those specified by the latest revision of the Hydraulic Institute (HI) standards for vertical turbine pumps.

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3.3 SUPPLIERS/ MANUFACTURES SERVICES

A. In accordance with Section 01001, provide for and receive services of a qualified representative of the pump manufacturer to:

1. Inspect installation of units and execute functional and vibration tests and certify that pumps have been installed in accordance with manufacturer's recommendations. Certification shall be in writing and shall be received and acknowledged by Engineer prior to placing pumps into operation.

3.4 PRODUCTION TEST

A. After installation of pumping equipment and full development of well, test installation in presence of Engineer for a period of 8 hours.

B. Reasonable stops, not to exceed a total of 1 hour, for adjustment of equipment and measuring devices shall be allowed.

C. Capacity of pump shall not be less than well capacity, which will be approximately 800 gpm, measured at the discharge flange of the pump and at a discharge pressure of 40 pounds per square inch at any time during the test.

D. Amount of water flowing from pump shall be measured by orifice test.

E. Contractor shall furnish testing and measuring devices.

3.5 TEST SAMPLES

A. Before well will be accepted, the following tests must be performed by the Arkansas Department of Health on samples taken on 2 consecutive days:

1. Bacteriological analysis.

2. Chemical Analysis.

B. Field sampling shall be performed by the ADH upon Contractor's request.

C. Request District Engineer for the ADH to perform field sampling 7 days prior to sampling date; by not requesting such sampling, Contractor takes responsibility for sampling.

D. Provide results of sampling in writing to Engineer.

18-5787 02525 7/6/20 Water Supply Production Well

Addendum No. 1

SECTION 02525

WATER SUPPLY PRODUCTION WELL

PART 1. GENERAL

1.1 SUMMARY

A. This Specification is to give the well contractor minimum standards required for drilling the water supply production well. Contract also to refer to Plans for specific details.

1.2 RELATED SECTIONS

A. Section 01001 – Basic Requirements.

B. Section 02086 – Manual Operated Valves.

C. Section 02522 – Well Pump and Motor.

1.3 REFERENCES

A. American Society for Testing and Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103.

B. ASTM A48 - Specification for Gray Iron Castings.

C. ASTM A53 - Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated Welded and Seamless.

D. ASTM AI20 - Specification for Pipe, Steel, Black and Hot-Dipped Zinc-Coated (Galvanized) Welded and Seamless, for Ordinary Uses.

E. ASTM Al93 -Specification for Alloy-Steel and Stainless Steel Bolting Materials for High- Temperature Services.

F. Arkansas Soil & Water Conservation Commission..

G. AWWA A100-15 – Standard for Water Wells

7/6/20 Water Supply Production Well

Addendum No. 1

PART 2. PRODUCTS

2.1 TECHNICAL CONDITIONS

A. The Engineer shall make a decision concerning proceeding with the construction of the production well in writing after receiving a written copy of the Driller’s Formation Log and geophysical log and recommendations of the Contractor's Hydrologist and a Site Approval Letter and comments from the Arkansas Department of Health Engineer Engineering Department and Geologist.

B. Based on the results obtained from the test hole, formation log and geophysical log, the Engineer shall select the depth to which the outer casing shall be set and the depths and lengths of the inner casing, blanks, and screen with recommendation from the well driller and ADH. The outer casing shall be installed from the top of the pump foundation to the top of the water-bearing aquifer from which the water is to be extracted. The outer casing shall not be less than12 inches nominal diameter.

2.2 OUTER CASING

A. Reaming:

1. The production well hole shall be reamed to a minimum diameter of four inches

(4") larger than the outside diameter of the outer casing. The drilling mud requirements shall be the same as the original test hole.

B. Plumbness:

1. The maximum allowable horizontal deviation (drift) of casing from the vertical shall not exceed two thirds of the smallest inside diameter of that part of the casing being tested per 100 ft of depth.

C. Alignment:

1. The alignment must be satisfactory for the successful installation and operation of the permanent pumping equipment. The alignment shall be tested by lowering a section of pipe or a forty-foot (40') long dummy into the casing. The casing shall be tested to the maximum possible depth of pump setting. This section of pipe or dummy shall move freely throughout the tested interval. The outside diameter of the pipe or dummy shall not be more than 0.5 inches (.5") smaller than the diameter of that part of the casing or hole being tested. If a dummy is used, it shall consist of a rigid spindle with a minimum of three (3) truly cylindrical rings, each ring being a minimum of twelve inches (12") wide.

The rings shall be located one at each end and one in the center.

2.3 CASING

A. All casing installed shall be new pipe with plain ends and machine beveled welding, or threaded for coupling, conforming to ASTM, A-53 or prime API 5L-Grade B. The

7/6/20 Water Supply Production Well

Addendum No. 1

Contractor shall supply the Engineer with ten (10) copies of mill certificates on the pipe with the heat numbers the same as found on the pipe. The outer casing shall be a minimum of 12 inches I. D., with a wall thickness of 0.375 inches.

B. The outer casing shall be equipped with centralizers with the first one located four feet (4') above the bottom of the casing and then one (1) approximately every one hundred feet (100') above that to the surface to hold the casing in the center of the hole. The top of the casing shall extend at least two feet (2') above ground surface.

C. Welding shall be done in accordance with the American Welding Society Specifications and the American Petroleum Institute Specifications. All welding shall be done by a qualified welder, experienced in water well projects, using adequate equipment, rods compatible with the casing materials, with full penetration, avoidance of slag inclusion, and complete filling of the weld space with weld metal.

The casing shall be aligned before the first bead is made. A minimum of four (4) aligning straps, a minimum of four inches (4") in length shall be used to align the casing or the Contractor may use aligning clamps. A minimum of two (2) pass welds shall be run around the complete circumference of the casing at each weld joint.

2.4 CEMENTING

A. The outer casing shall be cemented in place with a minimum of two inch (2") cement grout around the outside of the casing from bottom to top. The cement shall be placed by a standard Halliburton cementing method, involving pumping from the bottom of the casing, up the outside of the casing to the ground surface.

B. The hole and casing shall be circulated prior to beginning any cementing operations.

The viscosity of the drilling fluid shall be reduced to a minimum viscosity prior to circulation.

C. The neat cement grout material shall consist of a slurry mixture of Portland Class A Cement and water in a ratio of six (6) gallons of water per ninety-four (94) pound sack of cement and shall have a…