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ATTACHMENT I:FORMATION TESTING PROGRAM measurements of pH,conductivity, and temperature indicate that the water chemistry has been stable for at least 2 hours. Water quality in the Domengine Formation at the LEC-1 well is expected to be more like the injected water from the STIG-1 well,which is about 800 feet away and has been injecting since 1993. TDS is expected to be much lower than the native groundwater, and should be similar to the water quality proposed for injection at LEC-1.Samples of the fluid in the injection zone will be collected following well development and analyzed to allow for an evaluation of the compatibility of the proposed injected fluids with the injection zone matrix and waters in the injection zone. Samples will be analyzed for Resource Conservation and Recovery Act of 1976 (RCRA) metals;common ions like carbonate,bicarbonate,nitrates, sulfates, and phosphate;,and for coliform bacteria,radiological activity, and general water chemistry parameters like pH,TDS, and TSS.Standard analytical methods and EPA-accepted sample collection protocols will be used and documented. Hydrogeology of the Injection Zone (Domengine Formation) The most relevant existing data concerning the character of the proposed injection zone for the LEC-1 well was collected during the drilling,testing,and completion of the nearby STIG-1 well. The following discussion of injection zone hydrogeology is based in large part on information gathered from the construction and testing of that well. As the LEC-1 well is constructed and tested prior to initiation of injection operations,the actual conditions at the new well will be verified through testing. Thickness The Domengine Formation is 831 feet thick in the STIG-1 well. Based on information obtained from other wells in the area, that thickness ranges between a minimum of about 780 feet to a maximum of about 910 feet within a radial distance of 1 mile from the LEC-1 location (see Figure 1-1). The Domengine Formation as encountered in the STIG-1 well consisted of three primary sand bodies with thicknesses of 191 feet, 190 feet and 346 feet,respectively (top to bottom). These sands bodies were separated by 70-foot and 34-foot thick shaley intervals. The lowermost of the sand bodies is the primary injection interval at STIG-1 and is proposed as the injection interval for LEC-1. Age The Domengine Formation is of Middle Eocene age, or about 45 million years old. Lithology The Domengine Formation sands are mainly composed of light gray to white,very coarse to very fine grained, generally well sorted,unconsolidated,that are massively bedded. The finer grained materials separating the primary sand bodies consist of gray-brown shale and siltstones that may include minor amounts of lignite. 1-4 SAC/371322/082550025(ATTACHMENT-LDOC)