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Table 1.Mann-Kendall Trend Analysis Summary 26700 South Banta Road Tracy,California Monitored Total Detect Detect Minimum Maximum Minimum Maximum Mean Median Standard Coefficient Most Recent Most Recent Mann-Kendall Mann-Kendall Sen's Slope Mann-Kendall Trend Analysis Stability Based on Parameter Well Frequency Non-Detect Non-Detect Deviation Result Test Statistic S Estimator a Coefficient of Zone Samples Results (%) (µg/L)' (µg/L)1 Detect(µg/L)Detect(µg/L) (µg/L) (µg/L) (µg/L) of Variation (µg/L) Sample Date (unitless) p-value (µg/L/yr) Result Result Variation LM151B Lower 26 20 76.9% 0.1 0.5 0.3 1 0.53 0.55 0.24 0.46 0.25 2017-09-28 -216 0.000 -2.00E-09 100.0%(-) Decreasing Stable MW-5 Upper 13 9 69.2% 0.025 0.5 0.028 0.9 0.41 0.40 0.32 0.78 0.028 2025-03-18 -39 0.020 -9.85E-10 98.0%(-) Decreasing Stable Carbon Tetrachloride MW-10 Middle 45 33 73.3% 0.1 0.6 0.11 46 2.31 0.50 6.91 2.99 0.32 2025-03-17 -469 0.000 -1.20E-08 100.0%(-) Decreasing Not Stable MW-12 Middle 47 46 97.9% 3.3 3.3 0.4 11 3.63 3.00 2.48 0.68 1.3 2025-03-17 -192 0.080 -4.04E-09 92.0%(-) Decreasing Stable MW-15 Lower 46 29 63.0% 0.025 0.5 0.19 0.8 0.32 0.26 0.19 0.60 0.25 2025-03-18 97 0.361 7.16E-11 63.9%(+) No Trend Stable MW-1 Upper 59 58 98.3% 0.5 0.5 1.1 360 46.54 26.00 65.97 1.42 5.7 2015-08-27 95 0.539 1.53E-08 46.1%(+) No Trend Not Stable MW-2 Upper 19 19 100.0% 3.3 40 17.83 17.00 8.87 0.50 17 2011-08-24 -41 0.161 -4.57E-08 83.9%(-) No Trend Stable MW-3 Upper 63 62 98.4% 1 1 1 950 91.30 37.20 168.34 1.84 32.6 1 2017-09-28 388 0.022 -1.57E-07 97.8%(+) Increasing Not Stable MW-34 Upper 15 15 100.0% 32.6 170 108.92 130.00 1 43.11 0.40 32.6 2017-09-28 -77 0.000 -5.58E-07 99.9%(-) Decreasing Stable MW-5 Upper 13 13 100.0% 2.7 140 50.94 64.00 42.75 0.84 7.4 2025-03-18 -21 0.222 -1.13E-07 77.8%(-) No Trend Stable MW-6 Upper 52 50 96.2% 1 1 0.7 1200 128.57 2.95 293.73 2.28 0.5 2016-03-29 -1021 0.000 -9.79E-07 100.0%(-) Decreasing Not Stable Chloroform MW-7 Upper 51 48 94.1% 0.5 1 0.69 37 5.90 3.10 8.09 1.37 1 2012-08-24 -136 0.272 -1.16E-08 72.8%(-) No Trend Not Stable MW-9 Upper 39 35 89.7% 0.5 0.5 0.5 76 11.28 6.90 15.06 1.33 58 2025-03-17 -125 0.133 3.06E-08 86.7%(-) No Trend Not Stable MW-10 Middle 45 45 100.0% 4.5 1700 101.96 46.00 255.56 2.51 55 2025-03-17 -519 0.000 -4.62E-07 100.0%(-) Decreasing Not Stable MW-11 Upper 39 38 1 97.4% 0.5 0.5 2.5 1 77 22.94 1 13.00 1 23.45 1.02 4.8 2025-03-17 -551 0.000 1 -8.98E-08 100.0%(-) Decreasing I Not Stable MW-12 Middle 47 47 100.0% 44 480 183.75 150.00 110.41 0.60 76 2025-03-17 -450 0.000 -3.24E-07 100.0%(-) Decreasing Stable MW-15 Lower 47 45 95.7% 0.03 0.6 3.7 23 8.59 7.60 4.62 0.54 11 2025-03-18 253 0.021 9.41E-09 97.9%(+) Increasing Stable AP-2 Middle/Lower 9 6 66.7% 1 0.5 1 0.5 1 0.6 55 8.08 2.00 16.83 1 2.08 9.8 2008-09-23 4 1 0.748 -4.58E-07 25.2%(+) No Trend Not Stable Notes: 1.Minimum and maximum non-detect results are the minimum or maximum reporting limit or method detection limit associated with non-detect results for a given well.Minimum or maximum values assigned to non-detect results used in the Mann-Kendall Trend Analysis are assigned as described in Section 2.1 of Appendix G. 2.A 90%significance level(alpha of 0.10)was used to determine the presence of a trend for a given analyte. 3.A threshold of 1 was used to determine stability based on the coefficient of variation.Analytes with coefficients of variation below 1 were considered to be stable,and analytes with coefficients of variation above 1 were considered to be unstable. 4.All Mann-Kendall Trend analyses were run on the complete available dataset for a given well with the exception of this second MW-3 analysis.This analysis was run at MW-3 on data collected after August 2010,omitting data collected from September 1997 to March 2010.See the report text for additional discussion. --:no value available %:percent µg/L:micrograms per liter µg/L/yr:micrograms per liter per year 2025 Biennial Report Page 1 of 1 May 2025