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Underground Injection Control Branch Guidance No.: <br />wy~wyg://35/hu p://w w w.epa. gov/reg5oh 2o/u idr5_O5. h t m <br />Establish a positive pressure differential between the annulus and injection tubing sufficien <br />avoid changes which impinge on [he required pressure differential (most Class I permits <br />require at least a 100 psi pressure differential); <br />2. Isolate the annulus from any source of pressure maintenance; <br />3. Perform an SAPT, recording pressure at ten-minute intervals. If the pressure change is less <br />than 3% in 30 minutes for Class II and III wells or 3% in 60 minutes for Class I wells, the t <br />is passed and the SAMT begins: <br />4. Report [he results of near-continuous measurements of annulus pressure and injection press <br />in tabular and graphical formats along with tabulations of injection rate and pressure and <br />injec[a[e temperature as required by permit; and <br />5. Report the volume (in gallons) of any liquid added to or removed from the well's annulus <br />system. <br />For wells not using a sealpot assembly the operator must: <br />1. Establish a pressure greater than atmospheric on the casing/tubing annulus; <br />2. Isolate the annulus from any source of pressure maintenance; <br />3. Perform an SAPT, recording pressure at ten-minute intervals. If the pressure change is less <br />than 3% in 30 minutes for Class II or III wells or 60 minutes for Class I wells, the test is pa <br />and the SAMT begins; <br />Report the results of periodic measurements of annulus and injection pressures and conditi~ <br />under which pressure measurements are made, e.g. injecting or not injecting, and approxirr <br />injectate temperature; and <br />5. Report the volume (in gallons) of liquid added to or removed from the well's annulus sys[e <br />After any well failure, MI must be confirmed using the SAPT before resuming the SAMT. <br />E. Interpretation <br />The standard used for evaluating SAMT demonstrations is the same as that used for [he SAPT, i.. <br />3% pressure loss in either 30 or 60 minutes. However, it is only possible to apply this standazd w <br />external factors which might affect the annulus pressure are stable and a change in annulus press[ <br />is established. Otherwise, liquid property changes occurring in response to change in ambient <br />conditions make determination of aleck-induced pressure change impossible. <br />To provide an effective, real-time demonstration of MI, frequent inspection of pressure records is <br />needed. This review should focus on the pressure in the annulus relative to: 1) atmospheric press) <br />2) the injection pressure measured at the surface, and 3) pressure in aquifers along the well bore. <br />following occurrences [nay indicate a loss of MI: <br />For wells with injection pressure greater than the annulus pressure <br />1 I of 34 528/99 1:09 PM <br />