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ATTACHMENT A:AREA OF REVIEW METHODS injection zone is approximately 800 feet thick,reducing pressure in the formation at great distances from the well. Additionally,the presence of the extensive confining unit will prevent the formation fluids from moving between zones, except in locations where there are conduits. There are relatively few wells in the area (see discussion below). In addition, there are no known faults or fractures within the Area of Review that could serve as conduit for upward flow of injectate or poor quality water. Finally,it is not expected that the plants will operate at full capacity at all times,most likely at lower rates than the proposed permitted values,resulting in significantly less pressure than calculated based on the assumptions above. Based on evaluation of the fixed radius and volumetric methods,a relatively small radius of investigation of 0.25 to 0.30 miles is required. The allowable pressure increase method at full permitted rates suggests a radius of approximately 0.8 miles for 10 years and 1.4 miles for 30 years which appears to be conservative based on actual planned injection rates and an injection zone in the LEC-1/LEC-2 wells that is thicker than the 230 feet estimated in these calculations. Based on the calculations summarized above and a desire to be conservative in selecting the radius of the AOR, a total distance of 2 miles was selected. Potential Impact of Injection Operations on Wells within Area of Review The wells penetrating the confining zone within 2 miles are provided in Table A-6. Their locations are shown in Figure A-5. TABLE A-7 DOGGR Wells within 2 Miles of the Site Total Depth Abandon API Number Operator Lease Well No. (ft) Spud Date Date 7700509 Federal Oil Co. Federal 1 4,875 06/02/1955 05/30/1955 Imeson 7700518 Ferguson& Perrin 1 4,802 12/14/1962 12/18/1962 Bosworth 7720172 Great Basins Rio Blanco 1 5,450 10/14/1972 10/18/1972 Petroleum Co. 7720290 Great Basins City of Lodi 1 6,703 11/22/1976 11/30/1976 Petroleum Co. 7720345 Venoco, Inc. Ratto 14-1 5,820 10/30/1979 11/05/1979 7720381 Argo Petroleum Buttes-Rio 15-77X 4,931 10/13/1981 10/25/1981 Corp. Blanco 7720484 Princeton Natural Piacentine 1-27 4,900 07/4/1986 Gas, LLC 7720496 Maxus Exploration Red House 65-24 5,762 07/1/1987 07/01/1987 Co. Fee 7720568 Northern California Lodi STIG 1 4,650 04/29/1993 Power Agency A-8 SAC/371322/082550016(ATTACHMENT-A.DOC)