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303.900 Insulation 300-15 The insulat3on shall be placed betwe�n tbe atorm seWer or storm �eWer structure and the uatermain or serviae pipe. The in�ulation staall be placed 3n two l.ayers, eacl� layer on.e-iaeb (1'�} thiek, xith the joir►�s in the upper layer offset 1/2 baard Width i'rom the loWer layer. The insui�tian ahali be held in plac� to prevent movement during backfill bY 1/� ia��h diameter by �ix-inch (6") long wood doWels driven thr�ugh eaeh eorner° of the insulation board� into the soil �elow. Th� iasulation shall extend a minimum of four feet (4t) from ihe Qenterlin� of the �at�rmain or �ervie�, a�d a minimum of six feet �6') beyond the edge of th� storm sewer or structure alo�g the centerline of the watermain ar service. The aCtual depth, tbieknsss, width and length to be insulated shall be dstermined in the field hy the Engineer or his representativ� or as noted in the plans. 304.000 METHODS ,0� TESTIN�, AM? DISINF�CTION Ths Contractor shall perform all Engineerss presence. �04.10i� Leakar�e Test � Watermains teating and disinf�Gting in the A leakage test shall be performed on each valved s�etior of c�atermain to determine th� �quantity of water ';h3t must be supplied iz�ta each � section to maintain a test pressure of 150 pound� per sc�uare i.nch, aftei^ the test section has been slowly filled with wat��r and a�.l the air Y�.as been expelled from the line. The specified pressure sh,a11 be � applie� and sufficient wate�r shall be measured and supplied int�� the pipe aection to maintain �he pressure for a test duration oi' 'cwo hours (2 hrs.). LJ �� � L = ND P 3,700 L= Maximum permissible leakage in gallons per hour. N� Number of joints in length of pipe tested. D� Nominal diameter of pige in inehes. P; Average test pres�ure during the test, in pounds per square ineh, gauge press�ure. � If the pipe �ection under te�t contains pipe of' various dia.meters, the allowable leakage will be the 9u� of the computed lealcage for ea�;h si�e of joint, � L�J �J � � Th� contractor shall furnish the pump, pipe eonneetiona, gauges, and mea�uring equipment, and shall perform tihe testing under the direet supervision of the engineer. Where psr�anent air vents are not provided, the contraetor shall proaide and install cor�pora�ion cocks at the high points as needed for release of air as the linz is being filled with water.