02-11-1985 Council Packet - Laserfiche WebLink

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the pipe to a clean hare metal over the entire area of the weld. Straps bolted to mechanical ,joint fittings shall be not less than 1/16" x 1�". All straps shall be securely fastened and backfill placed so as to not damage the conductivity. Weld areas shall be recoated with the original pipe coating ma- terial or other suitable protective coating. Conductivity test shall be performed on all mains after they have been pres- sure tested and are full of water at normal operating pressure. A direct cur- rent of 350 amps at 30 volts shall be passed through the line for 4 minutes. Current flow shall be measured continuously on a suitable ammeter and shall remain steady without interruption or excessive fluctuation throughout the period. At the end of the 4 minute period, the current shall be raised to 400 amps for 1 minute without fluctuation. Insufficient current or wide fluctua- tions of ammeter needle shall be evidence of defective conductivity which shall be isolated, corrected and retested. Acceptable equipment for the test shall be arc welding machines with adequate sized cables to carry the test current without voltage dr p or overheating. Conductivity test shall be carried out in the presence of the Engineer or his duly authorized agent. Caution shall be exercised at all times when working with electrical equipment and wires during the conductivity test. 24,000.8. METHOD OF MEASUREMENT: 24,000.8.A. TRENCH EXCAVATION: Trench excavation will be measured in linear feet of trench according to the zone classifications specified as follows: From 0' to 8' , from 8' to 10' , and in two foot increments thereafter, which are based on the total depth of the trench to the designated grade of the pipe invert. No deduction in depth will be made for rock encountered in the trench above 0e designated grade. Measurement will be made along the centerline of the sewer and from center to center of all manholes, catch basins or junction fittings. 24,000.9.9. SOLID ROCK EXCAVATION: If solid rock is encountered in the trench, such rock excavation shall be measured by volume in c,ibic yards and shall be measured from the top of the rock to a point six inches below the outside barrel of pipe and twelve inches from each side of inside diameter of pipe. The minimum trench width of the solid rock excavation shall be 36 inches. For measvirement purposes volume will be computed ased on vertical wails 'or the width specified above. 24,000.8.C. SEWER PIPE: Sewer pipe of each diameter and classification fur- nished and installed will he measured separately by length in linear feet. Measurement will by matte along the centerline of the sewer and from ,:enter to center of all manholes, catch basins or junction fittings. Where hands, tee manholes, flared end sections or ether ape.•ial shapes are in- stalled, the length of pipe replaced by these strictures shall he deducted from the distance frcm center of manhole to center of manhole for pay pur- poses. The speci.gl strurttlres will be psid for as lseparatP bid items. :)4, n0O- i h 1%N4i45%4b Copvriptht 1984 llnnestroo, Ronrne, .Ande.rlik b Associates, Inc.