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TECHNICAL SPECIFICATION NO. 10 <br />DISINFECTION OF TANK <br />10.01 GENERAL <br />After construction or repairs have been completed, the tank shall be disinfected before it <br />is placed or replaced in service. Any of the three alternatives given in this standard <br />(Sec.10.03) shall be followed, as approved by the Owner. Prior to sterilization, the <br />Contractor shall insure that all foreign material is removed from the tank, to include <br />flushing the fill pipe. <br />10.02 INFORMATION TO BE SUPPLIED BY OWNER <br />The Owner approves disinfection using the following details: <br />A. Disinfection procedure 1, 2 or 3 to be followed <br />B. The Contractor shall be responsible for performing the disinfection. Owner <br />will supply water at no cost to the Contractor. <br />C. The Contractor will be responsible for securing the check test samples which <br />the Owner will deliver to the County Health Laboratory for testing. <br />D. The tank does not receive final clearance of completion until the test samples <br />have been declared satisfactory. Should the samples fail, the tank will be <br />drained, re-chlorinated, filled and retested until the samples are satisfactory. <br />All materials including water used for retest will be at Contractor's expense. <br />10.03 DISINFECTION PROCEDURES <br />A. Procedure 1- Direct Application of Strong Chlorine Solution to Inner <br />Surfaces. <br />Chlorine solution - Dissolve one ounce 65% calcium hypochlorite (HTH or <br />Perchloron) as a paste in each 24 gallons of clean water; or add 4 fluid <br />ounces of 5% liquid bleach to each 8 gallons of clean water; or add 4 fluid <br />ounces of 14 % liquid bleach to each 24 gallons of clean water. Each of <br />these solutions has about a 200 mg/1 concentration of available chlorine. <br />Dosages may be decreased for an extremely clean tank or where high <br />residual concentrations, after filling, are undesirable. <br />TS10-1 <br />- 453 <br />