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3. Implementation of Corrective Actions (a) If any wells requiring corrective action are found within the modified ZEI, a list of these wells along with their locations shall be provided to EPA as soon as possible. (b) If requested by EPA, the Permittee shall submit a plan to re-enter, plug, and abandon the wells listed in paragraph (a) above in such a manner to prevent the migration of fluids into a USDW. (c) The Permittee may not commence corrective action activities without prior written approval from EPA. C. WELL OPERATION 1. Demonstrations Required Prior to Injection Injection operations may not commence until construction is complete and the Permittee has complied with following paragraphs (a) and (b): (a) Mechanical Integrity The Permittee shall demonstrate that all wells have and maintain mechanical integrity consistent with CFR §146.8 and with paragraph 2 of this section. The Permittee shall demonstrate that there are not significant leaks in the casing and tubing and that there is not significant fluid movement into or between USDWs through the casing wellbore annulus or vertical channels adjacent to the injection wellbore. The Permittee may not commence injection until it has received written notice from EPA that such a demonstration is satisfactory. (b) Iniectate Hazardous Waste Determination The Permittee shall perform a hazardous waste determination on the injectate according to 40 CFR §262.11. The results of the analyses shall demonstrate that the injectate does not meet the definition of hazardous waste as defined in 40 CFR §261. (i) A sample of the injectate shall be taken by an individual with the proper expertise and sent to a laboratory with proof of certification from the State of California. Sampling must occur quarterly or every time there's a significant change in injection fluid, and shall be reported per section D paragraph 5(b)(ii) of this part. UIC Permit CAI 0500002 Page 12 of 29