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<br />(C) Sampling of ef.ent or waste disGharged m_ be accompli.shed <br />manually, or by the use of mechanical equipment, to obtain a <br />composite sample which would be representative of the total <br />effluent. Samples shall be taken at such intervals as to <br />establish the BOD, and Suspended Solids of the industrial waste <br />for billing purposes, as determined by the Approving Authority as <br />necessary to maintain a control over the discharges from the <br />Permittee. Additionally, such grab and composite samples as are <br />deemed necessary by the Approving Authority shall be taken at such <br />intervals as to establish the concentrations of prohibited <br />discharges and pretreatment standards as specified in this <br />ordinance. The method used in the examination of all industrial <br />wastes to determine BOD and Suspended Solids shall be as set forth <br />in "Standard Methods" or as defined in 40 eFR, Part 136. <br /> <br />111 <br />