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SS9901-SP020718972 735 3002 JUL 18 2002 14:57 FR TURNER COLLIE& BRADEN972 735 3002 TO 99723043570 P.01iO3 17300 Dallas Parkway Suite 1010 Dallas, Texas 75248 Turner �ollie c0Braden Inc. Fax :7972- 735 -3001 Engineers • Planners • Project Managers REMARKS: Rick, I have attached the COG spec "Item 6.7.3 Paragraph (f)" for hydrostatic testing of the 30" force main being installed on the St. Joseph development. Jp o '�(Al 51 Gr An AECOM Company JUL 18 2002 14:58 FR TURNER COLLIE& BRADEN972 735 3002 TO 99723043570 P.02iO3 Item 6.7.3. UNDERGROUND CONDUIT CONSTRUCTION tion of the joint to form curves shall not exceed the limits of Table 2, AWWA C -600. Where curves are sharp, short sections of pipe, bevels or bends shall be used and blocked. When pipe is cut by the CONTRACTOR to insert a valve or fitting, the bell and remaining section may be laid be- yond the valve or fitting. (d) Pipe Joints. All joints in pipe conduits shall be thoroughly cleaned at the time the joint is made. (e) Rubber Gasket Joints. Rubber gaskets shall conform to the applicable specifications under which the pipe is supplied. Loose gaskets shall be protected from sunlight, contamination and contact with gasoline of fuels. Rubber gasket joints for water mains consist of 4 general types: (1) push -on type used for gray or ductile iron, steel and plastic pipe. (2) mechanical type used for gray or ductile iron and fittings for asbestos- cement pipe. (3) tubber and steel joint ring type used for steel cylinder type, reinforced concrete pipe. (4) double rubber gasket couplings used for pressure pipe. Each type, except mechanical, requires the use of a lubricant to facilitate assembly. The lubricant shall be non- toxic, shall not support the growth of bacteria and shall have no deteriorating effect on the gasket. The lubricant shall not impart taste or odor in a pipe that has been flushed in accordance with Item 6.73. Care should be taken not to over -use the lubricant since it would then require excess effort to disinfect, (f) Hydrostatic Test. Before being accepted, ail gray iron, ductile iron, plastic and asbestos -cement pipe lines con- structed shall be tested with a hydraulic test pressure of not less than 150 psi (1034.3 KPa), maintained over a period of not less than 4 hours unless otherwise specified by the OWNER. Concrete pressure pipe shall be tested with a hy- draulic test pressure of 120 percent of the design pressure. Steel pressure pipe shall be tested with a hydraulic test Pressure not to exceed 150 percent and not less than 120 percent of the design working pressure. The rate of leakage of all pipe tested shall not exceed 11.65 gallons per inch of nominal diameter of pipe per mile (0.01 cu. m. per cm. of nominal diameter per km.) over a 24 hour period. Water lines of materials in combination shall be tested for the type of pipe (material) with the least stringent hydraulic test pressure maintained over a period of not less than 4 hours. Refer to the provided table, "Allowable Leakage for 4 Hours at Test Pressure of 150 PSI," to determine acceptable test values. = Longth of Pipe, R, = Diameter of Pipe, In. P _ 150 psi Sleight Correction = 0.43 psi/Ft. :x.50 valve Leakage Allowable = 0.0078 Gal./Hour /In. of nominal valve size Test — Gray Iron, Ductile Iron, Plastic. and AC at 150 psi — Concrete 120% of Design Pressure —Steel 120% Min. to 1 SO% Max. Design working Pressure JANUARY 1998 Allowable Leakage (Gals ) for 4 hours = SD P x4 133,200 JUL 18 2002 14:58 FR TURNER COLLIE& BRADEN972 735 3002 TO 99723043570 P.03iO3 UNDERGROUND CONDUIT CONSTRUCTION Item 6.7.3. All newly laid pipe, or any valve section thereof, shall be subjected to the above test with the gauge located at the lowest point in the system to be tested. If the line cannot be tested at its lowest point, a correction factor of minus 0.43 Ib. /vert. ft. (0.64 kg/vert. m) shall be made. If the tests indicate a leakage in excess of the above rate, then the CONTRACTOR shall be required to find the leak and repair same. Even if the test requirements are met, all apparent leaks shall be stopped. Allowance for valve leakage to the atmosphere may be determined as no more than 0.0078 gal. /hr. /in. (0.012 1/hr. /cm.) of nominal valve size - The OWNER cannot guarantee that an old existing system valve shall hold the required pressure. The CONTRACTOR has the option of plugging the new main prior to tying onto the existing system and testing against the old valve. If the old valve does not hold against the test pressure, then the CONTRACTOR must cut and plug the new main, hydrostatic test the new main, and then complete the tie -in. Internal test plugs may be used in larger R.C. mains in lieu of plugging prior to making a tie -in. The cost of testing and repairing the leaks, including all uncovering, repairing, backfilling and incidental work, shall be at the expense of the CONTRACTOR. (g) Measurement and Payment for Water Conduit Installation. (1) Measurement. Pipe, including corrosion protection if in place on the pipe, shall be measured for payment in linear feet (m) along the center line of the pipe actually laid. No deductions shall be made for fittings and valves, measurements being from center to center of fittings. Where a change in the size of the pipe occurs in the line, the measurement shall be to the center of the fitting. Where a change in the size of the pipe occurs in Iine, the measurement shall be to the center of the reducer. Conduits shall not be classified for payment according to the depth of the cut. (2) Payment. Pipe, including corrosion protection in placed on the pipe, shall be paid for at the contract unit price per linear foot (m), completed in place, as provided by the proposal and contract. The contract price per linear foot (m) shall be the total compensation for the furnishing of all labor, materials, tools, equipment and incidentals necessary to complete the work, including excavations, backfill, and disposal of surplus materials, in accordance with the plans and these specifications. (h) Water Conduit Appurtenances. (1) Description. This section shall govem for the construction of all miscellaneous water main structures. (2) Materials. All materials used in the construction of work specified in this section shall conform to the appli- cable sections of these specifications. (3) Excavation and Backfill. In general, excavation and backfill shall conform to the requirements of Item 6.2., "Excavation and Backfill." (4) Construction Requirements. The construction of reinforced concrete water main structures shall be per- formed in accordance with the requirements of Item 7.6., "Concrete Structures," and the following additional re- quirements: All formed surfaces of the concrete exposed to public view shall be given a textured finish as shown on the plans. All other formed surfaces shall be given the "Ordinary Surface Finish" as described in Item 7.6.10, "Finish- ing- (5) Creek Crossing. Creek crossing using pier construction shall be made in accordance with the details shown on the plans. Creek crossing shall be measured for payment as a lump sum or in linear feet (m) of pipe furnished and placed, plus the cubic vard (m') of concrete in place, or a combination of the two methods as may be set out in the contract and proposal. The contract price or combination of prices shall be compensation for the furnishing of all labor, tools, mate- rials, equipment and incidentals necessary to complete the work, including excavation for piers, erecting piers, strip- ping forms, erecting pipe and supporting pipe (if required), and disposal of surplus materials, in accordance with the plans and specifications. (6) River Crossings, Siphons and Miscellaneous Pipe Structures. River crossings, siphons and miscellaneous pipe structures which may be necessary shall be designed in detail on the plans. The structures shall be measured for payment per each or in linear feet (m) between the limits set out on the plans. Miscellaneous concrete shall be measured for payment and paid for at the contract unit price as provided in the proposal and contract. JANUARY 1998 251 ** TOTAL PAGE.03 **