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16 vs 20 Samples Power to Detect 10% Decay Rate in 10 years: RGB Sampling in Years: [0 2 5 10] 0.8 0.7 . 0.6 0> 8 0.6 CL 0.4 0.3 0.2 0.1 RGBs 16 vs 20 -0.75 to 0.8 power vs -0.9 power The statistical power for a 3point composite for 16 samples/segment is approximately 0.8 for RGBs 16 samples should be sufficient 20 40 SO too 120 Sample Size Individual Sample 3 Point Composite 5 Point Composite 160 180 200 Figure 9, er to detect a 10% annualized recovery rate in sediment by monitoring in year 0, 2f 5 and II cF, Sierra Club v. EPA 18cv3472 NDCA 1 Confidential: For Purposes of Settlement Negotiations Only Tiers 8&9 ED 002061 00117153-00001