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ATTACHMENT A:AREA OF REVIEW METHODS estimates the fluid front radius only and does not consider the pressure buildup that defines the Zone of Endangering Influence (ZEI). The following calculations use porosity and formation thickness values from STIG #1. The formation thickness is based on the completed formation thickness in that well (approximate interval from top perforation to bottom perforation) as evaluated during testing activities carried out since the well was put into operation (Fairchild and Wells,Inc, 2007). This is a conservative assumption, since the Domengine Formation is actually over 800 feet thick in the area of the proposed injection well,LEC-1 (NCPA, 1993) and the LEC-1 and LEC-2 wells are planned to be perforated over a thicker interval (approximately 4,230 to 4,575 feet bgs) than that used in the calculations. The following equation and values for variables (Table A-2) were used to calculate the AOR using the volumetric method: _ V 2 R 23.4HP TABLE A-2 Volumetric Calculations Summary for 10 Years Variable Description Value V Volume of injected fluid, gallons 2.3 billion gallons H Height or thickness of injection zone,feet 230 ft P Porosity of injection zone, percent 35.3% R Radius of invaded zone, feet 936 ft' ' based on 10 years of future injection Based on records of actual injection at the site, a total of 71.5 million gallons has been injected starting in 1993. Future injection activities at the site are planned with a maximum instantaneous injection rate of 425 gpm. At this maximum rate, a total of approximately 2.2 billion gallons of water will be injected in the next 10 years and 6.7 billion gallons over the next 30 years. Adding previous and planned future injection volumes,the total volume is approximately 2.3 billion gallons resulting in a radius of 936 ft or 0.18 miles in 10 years and 6.8 billion gallons resulting in a radius of 1,604 ft or 0.30 miles in 30 years. In general,the total distance injectate will travel will be larger than calculated above due to dispersion and channeling through discrete,highly permeable pathways within the formation. The following equation and values for variables (Table A-3) can be used to estimate a more conservative distance traveled in 30 years including the influence of dispersion: R'= R+2.3 DR SACI3713221082550016(ATTACH MENT-A.DOC) A-3