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(v) Record at least three (3) time steps (data points on pressure vs. flow plot) before reaching the anticipated fracture pressure. Use one (1) barrel per minute rate increments in the early test stages. Larger rate increments may be used later in the test, but justification for this request must be approved. (vi) At the end of the test, shut down pumps and record the instantaneous shut in pressure and observe the pressure falloff for a sufficient time period to observe and later analyze the radial flow portion of the injection zone during the SRT. The length of time for pressure falloff observation must be determined and discussed in the Permittee's submission plans in advance of conducting the SRT. (c) Fall Off Pressure Test("FOT") To determine and to monitor formation characteristics, a FOT shall be nm in at least one representative well selected by EPA after a_radial flow regime has been established at an injection rate which is representative of the expected contribution to that well from the facility's total wastewater generation. The FOT will be conducted in accordance with EPA guidance found in Appendix E. The Permittee shall use the test results to recalculate the Zone of Endangering Influence("ZEI," as defined in 40 CFR §146.6) and to evaluate whether any corrective action is now required (refer to Section C of this part); a summary of the recalculation shall be included with the FOT report. Detailed plans for conducting the FOT must be submitted to EPA for review and approval. Once approved, the Permittee may schedule the FOT, providing EPA at least thirty(30) days notice before the SRT is conducted. (i) Annually,the FOT test shall be repeated at an interval of not less than nine (9) months nor greater than fifteen (15) months from the previous test. The results of the test shall be included with the quarterly report due each January, as described in Section E paragraph 5 of this part. (ii) The latest static reservoir pressure and its cumulative behavior over time on a graphic plot of the injection zone shall be determined and reported with.the FOT report listed in paragraph (i) above. (d) Particulate Filters may be used upstream of the well, at the discretion of the operator, to prevent formation plugging or damage from particulate matter. The Permittee shall include any filter specifications in the Final Construction ¢— Report required in paragraph 9(a) of this section, including proposed particle size removal with any associated justification for the selected size. For any particulate filters used, follow appropriate waste analysis and disposal practices. FINAL UIC Permit CAI 0910003 Page 8 of 29 i