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(i) The Permittee shall provide well logs and representative water sample <br /> analyses from the targeted injection aquifer using method(s) approved <br /> by EPAas evidence. These analyses shall be sufficient to confirm <br /> compatibility of the injectate with the injection formation. Formation <br /> water samples from the injection zone will be collected (swabbed or <br /> other approved method) from the first new injection well (LEC-1 or <br /> LEC-2) upon its completion. Field measurements of pH, electrical <br /> conductance, and temperature will be carried out to confirm that <br /> representative Domengine Sand Formation water is being collected. <br /> Subsequepit laboratory analysis of the samples will include at least <br /> Trace Wetals, Alkali Conduc:0iity HarJ1�;w, pH TP8S—Speer <br /> Grav�(see II.E.I(a)), and Oil and Grease (per 40 CFR §136.3,Table <br /> I). <br /> (b) Sten-Rate Test("SRT") <br /> A SRT will be conducted on at least one representative well (STIG-1, LEC-1 <br /> or LEC-2) before injection is authorized, to establish maximum injection <br /> pressure. Refer to Society of Petroleum Engineering ("SPE") paper #16798 <br /> for test design and analysis. Similar testing may be required in other wells, at <br /> the discretion of EPA. The SRT will be used to establish the injection <br /> pressure and rate limitations, in accordance with section D, paragraphs 3 and <br /> 4 of this part. Detailed plans for conducting the SRT must be submitted to <br /> EPA for review, possible editing, and approval. Once approved, Permittee <br /> may schedule the SRT,providing EPA at least thirty (30) days notice before <br /> the SRT is conducted. <br /> (i) Injection as proposed in an approved SRT procedure is temporarily <br /> authorized while the SRT is completed. <br /> (ii) Prior to testing, shut in the well long enough so that the bottom-hole <br /> pressure approximates shut-in formation pressure. <br /> (iii) Measure pressures with a down-hole pressure bomb or other <br /> approved pressure monitoring system and synchronize the data with <br /> data from a surface pressure recorder. Data sampling rate must allow <br /> for observation and analysis of the pressure transient behavior during <br /> each rate step as well as during the final pressure falloff period which <br /> is discussed in item(vi)below, <br /> (iv) Use equal-length time step intervals throughout the test; these should <br /> be technically justified and should be sufficiently long to overcome <br /> well bore storage and to achieve radial flow. Use thirty (30)minute or <br /> longer time intervals. <br /> FINAL UIC Permit CA10910003 <br /> Page 7 of 29 <br />