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The well identified as Deep Injection Well #1 is proposed to be used to inject pretreated process wastewater and ex- tracted groundwater into the Domengine Formation. e. Special Conditions The Code of Federal Regulations (CFR) requires that a per- mit for a Class I well be effective for a fixed term not to exceed ten years from the effective date of the permit. This permit will be effective for a 10-year period should the permit be issued as drafted (40 CFR §144 . 36) . The per- mittee will be authorized to inject for a 10-year period beginning on the effective date of this permit. The draft permit contains a condition which states that EPA may, for cause, modify, revoke and reissue, or terminate the permit in accordance with any applicable amendments to the Safe Drinking Water Act (SDWA) . Additionally, the draft permit requires the permittee to conduct mechanical integrity testing .prior to commencing injection and annually thereafter to demonstrate that un- derground sources of drinking water (USDWs) are being protected. This draft permit is for the drilling and construction of a new well. Therefore, much of the data specific to the proposed well site does not yet exist. The draft permit requires the permittee to conduct extensive testing of the injection zone, the confining zone, and other formations encountered during the drilling of the well. This informa- tion will then be sent to the EPA for review prior to the applicant receiving authorization for initial operation of the well. f. Hydrogeology of Injection and Confining Zones EPA staff evaluated the subsurface geology of the proposed injection area by analyzing seismic data, well logs, well history reports, published maps, cross sections and reports. The proposed injection site is a part of the Great Valley, also referred to as the Central Valley. The northern part of the Great Valley is known as the Sacramento Valley. The site is located in the southern Sacramento Valley. The principal structures in the southern Sacramento Valley are the Midland Fault, the Stockton Fault, and the Thornton Arch or Anticline. The proposed injection zone is the Domengine Formation of Middle Eocene age. The estimated minimum thickness of the Domengine Formation at the proposed site is 350 feet. 3