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due to metered pressure and corrected for dcviation using average values of recorded relative density and flowing temperature, or by using the calculated relative density determined by the method mentioned in paragraph lC) below. In no c~cumstance will the average value of flowing temperature or relative deasity be determined for a period of {ess than one day. (b) The facilities installed for measurement of ga~ hereunder will be installed and operated, and gas measurement computations will be rfiade, in accordance with current industry standards. Orifice metering will be done in accordance with the latest version of A.G.A. Report No. 3 - AN$1/API 2530. Positive displacement and turbine metering will be done in accordance with the latest version of A.G.A. Report No. 7, Electronic Gas Measurement (EGM) will be done in accordance with the latest version of APl Manual of Petroleum Measurement Standards Chapter 21 - Flow Measurement Using Electronic Metering Systems. (c) TXUGD may at its expease properly install and operate a device of standard make to continuously determine or record flowing temperature. The temperana'e values shall be used in gas measurement computations. With respect to relative density (specific gravity) of the gas, such shall be determined by (i) [on-site] sampling and laboratory analysis; or (ii) any other method which is of standard industmy practice; (iii) provided, however, that either party may at its own expense properly instaII and operate a recording relative density instrument of standard make and in this event the relative density as recorded shall be used in the gas rneasurcment computations. (d) The average heating value (in Btu) and relative density of the gas delivered hereunder by either party may be determined by the use of recording instruments of standard type, which may be installed and operated by TXUGD at the measuring point, or at such other point or points as axe mutually agreeable to both parties; prov. ided, however, if there is no Btu/relative density instrument at a particular Receipt or Delivery Point specified herein or agreed upon hereunder, then the heating value and relative density of the gas at such point may be determined by [on-site] sampling and laboratory analysis. (e) The terms "decatherm" and "MMBtu" may be used thterehangeably th this Contrect as a measure of vo{ume or heat content under the conditions stated in paragraph 8(a), and may be convened from one to the other in accordance . with the Ideal Gas Laws under those conditions when necessary. (f') The term "Mc£' means one thousand (1,000) cubic feet of gas under the conditions stated in paragraph 8(a). (g) In gas measurement computations thc dctormiuatioas for the average values for meter pressure, relative density and flowing temperature values will be determined only during periods of time when gas is actually flowing flu'ough the measuring facilities. 9. Measuring]~uinment and Testing (a) The gas delivered to TXUGD (or its designee) at the Receipt Point(s) for transportation by TXUGD will be measured by means of gas measuring devices of standard type that will be installed, operated and maintained by TXUGD (or its designee) and gas delivered to Customer at the Delivery Point, whether sold or u-ansported, will be measured by electronic gas measurement facilities of stand~d type that will be installed, operated and maintained by TXUGD (or its designee). Gas measurement devices and equipment will be tested and adjusted for accuracy on a regular schedule by TXUGD (or its designee). (b) If adequate measuring facilidas are already in existence at the Receipt Point(s) and adequate electronic measuring facilities are already in existence at the Delivery Point hereunder, such existing mensming facilities will be used for so long as, in TX'UGD's sole opinion, they remain adequate and Ibe patty having title to such facilities will retain title to such facilities. (c) It is agreed that it will be necessary for TXUGD to install electronic gas measurement facilities at the Delivery Point in order to comply with the various measurement and monitoring gn'ovisioas of this Contract, if, in TXUGD's sole judgement, adequate electronic gas measurement facilities are not already located at the Delivery Point. (d) lfocworadditional facilities are required to effectuate the reeeipt or delive~ of gas hereunder, Customer agzees to reimburse TXUGD. within thirty (30) days from the date of receipt of TXUGD's invoice, for the cost of any *ap valves, measuring facilities and associated equipment and all labor and overhead expenses (including applicable federal income tax imposed as a result of installation of such facilities), attributable to the installation of such equipment. If the invoiced amount is not paid when due, interest on all unpaid amounts will accrue at tha rate of one and one-half percent (1 - 1/2%) per month, or the highest rate allowed by law. whichever is less, from the date such amount is due TXUGD. If TXUGD docs not receive total reimbursement through the payment of such invoice 5 Rev 05/25/01 Attach. to Rate Sch. 4221 08