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• (e) Annual Minimum Quantity. Interruptible rate customers <br />shall be obligated to take or pay for a minimum quantity of <br />1,200,000 cubic feet of gas annually. Each year as of June 30 <br />the director of finance shall calculate the total consumption of <br />each interruptible customer for the preceding twelve monthly <br />billing periods, and shall bill any customer that has consumed <br />less than the minimum quantity for the deficient amount at the <br />rate of $5726 $4.72 per thousand cubic feet plus applicable <br />purchased gas adjustments. The minimum quantity shall not be <br />applicable to any customer who has begun receiving service at the <br />interruptible rate for the first time during the preceding twelve <br />months. If an interruptible customer terminates service the annual <br />minimum requirement shall be prorated on the basis of 100,000 cubic <br />feet per month for each month the customer has received service <br />since the last June 30 adjustment. <br />(f) Contract required. Before service is turned on under <br />this section, the customer shall agree in writing to abide by the <br />terms and conditions of this section. <br />Section 12-7. Purchased gas adjustment. <br />• In computing gas customer billings the basic rate charges <br />established under sections 12-3, 12-4 and 12-6 shall be adjusted <br />to reflect increases and decreases in the cost of gas supplied <br />to the city. Such increases or decreases shall be computed as <br />follows: <br />(a) Base unit costs. For the purpose of computations <br />herein, the costs and charges for determining the base unit <br />costs of gas are (1) supplier tariffs, (2) contract quantities, <br />and (3) costs of substitute natural gas, in effect Agri -387-}984 <br />March 31, 1985, including commodity rates expected to go into <br />effect July 1, 1985, retroactive to April 1, 1985. Such base <br />unit costs are $479986 $4.3259 per thousand cubic feet for firm <br />gas service and $4-3684 $3.6923 per thousand cubic feet for <br />interruptible gas service. <br />(b) Periodic adjustment. In the event of any changes in <br />supplier tariffs, contract quantities or costs of scheduled <br />substitute natural gas, the unit costs shall be recomputed on <br />the basis of such change in accordance with procedures approved <br />by the city manager. The difference between the unit costs so <br />computed and the base unit costs shall represent the purchased <br />gas adjustment to be applied to all customer bills, including <br />• minimum monthly charges but not including ornamental gas lights, <br />issued beginning the first billing month after each such change. <br />