Attachment_4 _Specifications_Waterline_Replacement.pdf

01/08/2013

ATTACHMENT 4

SPECIFICATIONS

Waterline Replacement

Clear Creek Recreation Area Bankhead National Forest

National Forests in Alabama

OWNER:

USDA Forest Service

Southern Region

Clear Creek Recreation Area, Bankhead NF, Waterline Replacement

TABLE OF CONTENTS

(page)

1.01 GENERAL ADMINISTRATIVE REQUIREMENTS

2.01 CONTRACTOR USE OF SITE AND PREMISES

3.01 SUBMITTAL REQUIREMENTS

4.01 TOLERANCES

5.01 QUALITY CONTROL

6.01 TESTING AND INSPECTION

7.01 WATER SUPPLY PIPE AND FITTINGS

8.01 DISINFECTION OF THE WATER SYSTEM

9.01 TRENCHING AND BACKFILLING

10.01 PIPING SPECIALTIES (UTILITIES)

1.01 GENERAL ADMINISTRATIVE REQUIREMENTS

1.02 Period of performance for work under this contract is 30 days.

1.03 Damage to government property caused by the installation of this work shall be repaired equal to or better than the existing condition.

1.04 Contractor shall submit as-built plans upon completion of work. As-builts shall depict an accurate record of the location where all components have been installed throughout the system.

1.05 Contractor shall submit a planned schedule of work within

10 days of issuance of notice to proceed.

1.06 Work under this contract shall be performed during daylight hours Monday through Friday excluding federally designated holidays. If contractor intends to work nonstandard hours, request shall be made to the Contracting Officer.

2.01 CONTRACTOR USE OF SITE AND PREMISES

Cooperate with Government to minimize conflict and to facilitate

Government's operations. Prevent outages and disruption of utility services to other facilities. Contractor is permitted to use on site electric power as necessary for work performed under this contract. Materials may be stockpiled on site at locations designated by the COR.

3.01 SUBMITTAL REQUIREMENTS

3.02 Submit component specifications at least seven days before installation. Do not incorporate material requiring submittal into the work until approved.

3.03 Submit certification by the manufacturer and installation subcontractor to COR for materials and components. Indicate material or product conforms to or exceeds specified requirements. Submit supporting reference data and affidavits as appropriate.

3.04 When specified submit manufacturer’s instructions for

delivery, storage, assembly, installation, special procedures, start-up, adjusting, and finishing.

4.01 TOLERANCES

4.02 Perform work that is uniform in character and reasonably close to the prescribed value or within the specified tolerance range. Results from inspection or testing shall have values within the specified tolerances or specification limits. When no tolerance values are identified in the contract, the work will be accepted based on customary manufacturing and construction tolerances.

4.03 Piping Layout Tolerance:

Horizontal Tolerance +/- 1.0 foot

Vertical Tolerance +/- 0.5 feet

4.04. Comply with manufacturers' tolerances. Should

manufacturers' tolerances conflict with contract documents, request clarification from COR before proceeding.

5.01 QUALITY CONTROL

5.02 Contractor shall submit a Quality Control Statement not to exceed one page. Describe duties and responsibilities of on-site superintendent and all personnel. Identify who will be responsible to witness critical work activities, oversee implementation of quality control, document material approvals, inspect works executed by sub-contractors, and coordinate all testing and reporting. Describe method of verifying material as per project specifications and inspecting delivered materials as per relevant standards, and constructing in accordance with code requirements.

6.01 TESTING AND INSPECTION

6.02 Furnish all test pumps, gauges, and equipment for the

testing of all portions of the water distribution system including all lines, fittings, valves, and hydrants.

6.03 Prior to disinfection and after thorough flushing of the portion to be tested, perform tests upon completion of pipe installation or any section thereof. Pipe joints shall be left exposed during this test for inspection by the Government.

6.04 Slowly fill each valved or plugged section of the pipe with water and apply the test pressure measured at the point of lowest elevation by means of a pump connected to the pipe. The test pressure at this point shall be the working pressure of the pipe, i.e., 200 psi class 200. The pump is to take suction from the small tank or other suitable means for measuring water pumped into the system.

6.05 Prior to beginning the test time measurement, operate all hydrants, taps, etc., to bleed entrapped air from the system.

Operate pump continuously during bleeding operations to maintain test pressure in the system. After eliminating air from the system, measure and record the water level in the tank. At the end of the test period, again measure the water level. The difference in the two measurements will be considered leakage.

6.06 Maximum permissible leakage shall be in accordance with the following formula:

L= (N x D x √P)/7400 where, L = allowable leakage in gallons per hour

N = number of joints in length of pipeline tested

D = nominal diameter of the pipe in inches

P = average test pressure during the test in pounds per square inch

6.07 Where leakage is in excess of maximum permissible, contractor shall repair the water line and reduce leakage to within the specified limit. If leakage is less than the specified amount, stop individual leaks observed before pipeline is accepted by the COR.

6.08 Maintain specified test pressure for a minimum of 2 hours after time measurement begins. No testing shall be carried out unless the COR is present during the testing period.

6.09 Replace defective pipe, fittings, valves, joints, and

hydrants discovered during the test and repeat the test after replacement until a satisfactory test is obtained.

6.10 No paints, asphalts, tars, enamels, or other types of pipe compounds shall be used to eliminate leaks.

6.11 Necessary apparatus required for testing, including pump, pipe connections, gauges, and meters, shall be furnished by the contractor, and all costs incidental to testing shall be borne by the contractor and included in his bid price for construction.

7.01 WATER SUPPLY PIPE AND FITTINGS

7.02 This work includes all pipe, connections, supports, and

related work necessary to provide a finished working system and complete installation of the water pipe. The piping system shall consist of laying the PVC lines as shown on the plans.

The contractor shall connect to the existing facilities and service lines where needed.

7.03 The pipe trench shall be undercut to the required depth.

The contractor shall be responsible for providing bedding and backfill for all lines lain in trenches.

7.04 Plastic water piping shall be PVC Class 200, SDR 21. Pipe shall be slip joint (1-1/2" and larger) with NSF certification stamped on each section. Fittings shall be Schedule 40 slip joint PVC. Joints 1-1/2" and larger shall be made with flexible sealing rings. Pipe less than 1-1/2" shall be solvent jointed.

Pipe and fittings shall be certified for potable water, Certain-

Teed, or approved equal, meeting ASTM 2241.

7.05 Before the pipe is laid in the trench, the earth forming the bed shall be carefully freed of stones, roots, and other deleterious material. The pipe shall then be evenly bedded in the earth with care taken to remove only enough of the earth to leave a uniform support for the entire length of the pipe to prevent sags except the couplings under which a recess shall be excavated to a sufficient depth to relieve it of any load. In case the bed trimmed on the bottom on the trench is too low, earth shall be placed in the bottom of the trench and thoroughly tamped, and a new bed trimmed for the pipe.

7.06 Pipe shall be laid with spigot ends pointing in the

direction of water flow.

7.07 Solvents and primers for PVC shall be in accordance with pipe manufacturer's recommendations. All surfaces of the pipe and jointing material to be joined shall be clean and dry.

Joints shall be made, fitted, and adjusted, and a water tight joint obtained.

7.08 Backfill shall not be placed over any pipe that is in a

heated condition. Before backfilling, the pipe temperature shall be brought to the approximate temperature of the ground either by running water through it or by backfilling in the early morning when the pipe and ground are at the same temperature.

7.09 Trenches shall be kept water-free and as dry as possible during bedding, laying, jointing, and backfilling.

7.10 Connections will be made to the existing and/or constructed facilities according to standard plumbing practices. Any connections made between metal and plastic pipe or connections between different materials including valves and fittings shall be made using connectors and adaptors designed specifically for that purpose.

7.11 When joining threaded fittings of adaptor with pipe, coat threaded ends of adaptor with a gasket cement recommended by the plastic pipe manufacturer. Do not use plumber's pipe dope on plastic to metal connections.

7.12 All piping shall be run straight unless otherwise shown.

All changes in direction shall be made with standard fittings as specified herein. Longitudinal curving angle of pipe shall not exceed manufacturer's recommendations.

7.13 Thrust blocks shall be provided at all locations shown on the plans. In addition thrust blocks shall be provided at all tees, wyes, and bends greater than 22-1/2 degrees in pipe equal to or greater than 2" in diameter. The thrust blocks will be sized and placed according to the pipe manufacturer's recommendation and shall contain a minimum 1 cubic foot of concrete.

7.14 Installation shall be in accordance with the

specifications, the drawings, and as directed by the COR in the field.

8.01 DISINFECTION OF THE WATER SYSTEM

8.02 This specification applies to the disinfection of all

portions of the water system.

8.03 Liquid chlorine shall be used as the disinfection medium.

8.04 Disinfecting material shall be placed in the system at the minimum rate of 0.83 pounds of chlorine to each 1,000 gallons of water in the pipeline. This will provide approximately 100 milligrams/liter of available chlorine in the water system.

8.05 The entire system shall be thoroughly flushed with water to remove sediment. Following flushing the system shall be filled with the disinfecting solution. All taps, hydrants, and other outlets shall be opened and left open until a strong odor of chlorine is noticeable in the water coming from each, after which the taps, hydrants, and other outlets shall be closed.

8.06 Chlorinated water shall remain in the system a minimum of

24 hours, after which the system shall be examined by the COR for residual chlorine and then drained out. At the end of the

24-hour period, the chlorine residual shall be a minimum of 25 parts per million. If no residual chlorine is found present, the process shall be repeated. During the retention period, all valves, stops, and other appurtenances shall be operated to assist this disinfection. When the disinfection is completed, the system shall be flushed with potable water such that the chlorine residual remaining is no higher than that generally prevailing in the system.

8.07 After the system has been thoroughly flushed, samples shall be taken from representative points in the system in sterile containers and submitted by the Government for bacteriological and physical property examination. Coliform organisms shall be absent. If the report of this examination is unsatis factory, the disinfection and flushing procedure shall be repeated until satisfactory results are obtained. No water from the system shall be used until the examination is satisfactory as determined by the COR.

9.01 TRENCHING AND BACKFILLING

9.02 Work included in this section covers trenching and

backfilling of all trenches.

9.03 Detectable warning tape shall be installed in all pipe

trenches. Plastic identification tape shall be colored blue, 5 mil thickness, 2 inches wide, shall identify the buried pipeline, shall have capability of being detected with a metal detector, and shall be manufactured by Omega Marking Co., P.O.

Box 655, Beaver Dam, WI 53916 or approved equal.

9.04 Trenches shall be excavated through any or all materials regardless of natural substances. A firm full length support shall be formed for underground pipe. The width of the trench at the top of the pipe shall not be greater than 24".

9.05 If the bottom of any excavation is excavated beyond the

limits shown on the plans, it shall be refilled at the

Contractor's expense with an acceptable material compacted to the density of adjacent undisturbed material.

9.06 Where the excavated material is rock or other

unsatisfactory bedding material, the trench shall be excavated below the final grade of the pipe invert a distance of 4". The trench shall then be backfilled to the grade of the pipe with mineral soil free from stones and compacted to the density of adjacent undisturbed material.

9.07 The Contractor shall take all precautions to assure that water does not accumulate in trenches while utility lines are being constructed.

9.08 All backfill material shall be loose earth and shall be

free from clods, roots, and stones over 1-1/2" in size.

9.09 Any pipe damaged by backfill operations shall be replaced by new pipe.

9.10 Trenches shall be bedded to the proper elevation for

installing the pipe with compacted select, fine, granular material.

9.11 After the pipe is installed, selected material shall be

placed beside the pipe in layers not exceeding 6" and compacted to the density of adjacent undisturbed material.

9.12 Trenches shall be mounded to complete the backfilling

operation.

9.13 Backfilling shall not be performed on any section of

pipeline without prior approval of the COR.

9.14 Contractor shall not trench at asphalt paved road

crossings. Trenchless directional boring shall be utilized to sleeve pipelines at paved crossings.

10.01 PIPING SPECIALTIES (UTILITIES)

10.02 The work required under this section consists of

furnishing and installing piping specialty items for the water systems.

10.03 Adapters used between different pipe materials shall be made specifically made for that purpose.

10.04 Check valves shall be diaphragm operated, single seat, globe pattern, spring loaded and hydraulically operated. Seat ring shall be replaceable without removing valve from line.

Valve shall be 125 Class, cast iron with bronze trim Clayton

Model 100-01 by Cla-Val Co., Newport Beach, CA 92663 or Model

No. 65 by OCV Control Valves, 7400 East 42 Place, Tulsa, OK

74145, or approved equal.

10.05 Gate valves shall be model 4067-03 push on style for PVC manufactured by M&H Valve Company, 605 West 23rd Street, Anniston, AL 36201 or approved equal.

10.06 Combination air valves shall be cast iron model 945

manufactured by GA Industries, 9025 Marshall Road, Cranberry

Township, PA 16066 or approved equal.

10.07 Plastic valves shall be plain body ball valves, socket

ends, full port, 150 psi working pressure at 120 degrees F., PVC, 1/4 turn open/close, straight body.

10.08 All valves installed in valve boxes shall be wrench

operated.

10.09 Valve boxes shall be ABS plastic with "WATER" imprinted on solid locking cover, two piece adjustable, screw type 4-1/4" minimum shaft, arched bell bottom with flange, minimum bury 24".

10.10 Freeze resistant hydrant (if needed) shall be Hoeptner

Products of Gilroy, California, (www.freezeflow.com) Freeze Flow

Executive model no. 2132E or approved equal. Hydrant shall have

5 lb. ADA operation, reservoir below frost line, and meet ASSE

1057 Sanitary Yard Hydrant Standard.

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