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Equation 3 — Performance Period Water Consumption <br />D,,, =Cm <br />Where, <br />Dm = Actual annual Performance Period water consumption for account m <br />Equation 4 — Billed Performance Period Water Consumption <br />12 Y P. x F. <br />E,,n B, x <br />k <br />I P x A, <br />J=1 <br />Where, <br />Em = Billed annual Performance Period water consumption for account m <br />FI = Performance Period accuracy of water meter in flow category j <br />Equation 5 — Increased Billed Water Consumption <br />n <br />G = JE,,, - H,,, <br />m=1 <br />Where, <br />G = Water consumption metered and billed due to project on all accounts <br />C. Key Parameter Measurement Strategy <br />This section outlines the measurements that will be conducted to determine the measured values in the <br />equations provided above in Paragraph B. Of the four variables that are included as non -calculated inputs <br />to the equations, three will be determined by measurements. Those three are B; (billed water <br />consumption for calendar month i), AI (baseline accuracy of water meter in flow category j), and FI <br />(Performance Period accuracy of water meter in flow category j). The sub -sections below define what will <br />be measured during each phase of the project and the requirements for those measurements. <br />Pre -Implementation Measurements and Documentation <br />B; (billed water consumption for calendar month i) will be recorded for each meter included in the project. <br />This data has been collected by Customer through the water billing performed during the date range <br />specified in Paragraph B. No additional measurements will be taken in association with parameter B;. <br />AI (baseline accuracy of water meter in flow category j) will be determined by taking samples of the <br />accuracy of the pre -project water meters. This will be completed before the existing meters have been <br />replaced. Accuracy will be computed by dividing measured consumption by the actual water flow during a <br />short-term test. These tests may be performed at the meter location or at a remote testing facility. The <br />average accuracy percentage for each class will be used as the appropriate Ai figure for each meter. The <br />table below will be used to list the results of these measurements. <br />Baseline Meter Accuracy Percentage (A) <br />Flow Category 1 Flow Catego 2 Flow Cate o ... Flow Category K <br />5/8-Standard <br />3/4-Standard <br />—I <br />1-Standard <br />2-Standard <br />3-Standard <br />1 1/2-Standard <br />6-Standard <br />8-Standard <br />I <br />4-Standard <br />Energy Solutions Proprietary and Confidential <br />v102811 25 <br />