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ATTACHMENT A:AREA OF REVIEW METHODS <br /> TABLE A-5 <br /> Pressure Buildup Calculations Summary—LEC-1 <br /> Variable Description Value <br /> P; Initial reservoir pressure at 4100 feet, pounds per square inch 1,779 psi <br /> Q Injection rate, barrels/day 14,571 bpd (425 gpm) <br /> µ Viscosity of injected fluid, centipoise 0.54 cp <br /> B Formation Volume Factor, dimensionless 1 <br /> K Formation permeability, millidarcies 54.4 and <br /> H Formation height or thickness, feet 230 ft <br /> T Time since injection began, hrs 87,600 hrs (10 yrs) <br /> Porosity, percent 35.3% <br /> C Formation Compressibility,feet/psi 7.5x10-6 <br /> R Radius or distance from injection well,feet variable <br /> S Skin factor, dimensionless Zero* <br /> P(r,t) Pressure as a function of r and t, psi variable <br /> *Skin factor is a measure of well efficiency applicable for pressure calculated in the well only. <br /> Modified Theis—Zone of Endangering Influence <br /> The zone of endangering influence is the area where the injection zone pressure exceeds <br /> pressure in overlying USDWs. . The following equation is used for calculating the distance <br /> where pressure of the injection interval increases above the allowable pressure (modified <br /> from 40 CFR 146.6). <br /> _ 2 <br /> — (2.25KHt <br /> S10X <br /> Where the exponent x is calculated as <br /> X 4)TKH(AP lrowabre <br /> = <br /> 2.3Q <br /> A-6 SAG371322/082550016(ATTACHMENT-A.DOC) <br />