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7. Annulus Measurements The annulus between the tubing and the long string casing shall be filled with treated fresh water to prevent corrosion and/or bacterial growth. A minimum surface annular pressure of 100 prig shall be maintained at all times. The permittee shall notify the Director in accordance with Part I, Section E, Item 12(d) of this permit when a change in the total annular fluid volume exceeds two (2) gallons, referenced to a temperature and pressure representative of actual operating conditions. A volume adjustment in the annulus is considered a physical alteration and is subject to the reporting requirements of Part I, Section E, Item 12(a). The total annular fluid volume range and the minimum annular pressure must be maintained unless a demonstration for suitable alternate values is submitted by the permittee and has been approved, in writing, by the Director. C. MONITORING REQUIREMENTS 1. Sampling and Analytical Methods 144.51(j)(1) and 144.52(a)(5)] Samples and measurements taken for the purpose of monitoring shall be representative of the monitored activity. The method used to obtain a representative sample of the fluid to be analyzed and the procedure for analysis of the sample are as follows: (a) Grab samples shall be collected at the sampling valve located downstream of all points where waste material might be added to the injection stream and used for laboratory analysis for physical and chemical characteristics. (b) Temperature, annular pressure, and injection pressure shall be measured downstream of the injection pump. (c) Injection rate/flow rate shall be measured downstream of the injection pump. (d) All monitoring and recording equipment shall be calibrated on a regular basis. The permittee shall submit, to the Director, a report describing the calibration pro- cedures and the frequency at which the equipment will be calibrated. (e) The permittee shall submit, to the Director, a report identifying the types of tests and methods used to generate the monitoring data as specified by 40 CFR 136.3 or Appendix III of 40 CFR 261. When the analytical method for a particular parameter is not specified in either 40 CFR 136.3 or Appendix III of 40 CFR 261, the permittee must obtain EPA approval of the types of tests and methods used to generate the monitoring data. This report must be submitted for approval by EPA a minimum of thirty (30) days prior to collecting monitoring data for the first Quar- terly Report and any time the monitoring procedures are changed or modified for subsequent reporting periods. (f) The permittee shall notify the Director 30 days prior to collecting the first set of samples and any time the permittee plans to change the method of collecting or analyzing samples. Unless the Director approves any requested changes in the methods of sampling and analysis the permittee shall not deviate from the approved sampling and analysis plan. 12