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1534 Willow Pass Road,Pittsburg,CA 94565-1701 M c C a m p b e I l Analytical, Inc. Toll Free Telephone:(877)252-9262/Fax:(925)252-9269 "When Quality Counts" http://www.mccampbell.com/E-mail:main@mccampbell.com Quality Control Report Client: Kirkwood Meadows Public Untility District WorkOrder: 2604713 Date Prepared: 04/10/2026 BatchID: 339405 Date Analyzed: 04/12/2026-04/13/2026 Extraction Method: SW5030B Instrument: GC45,GC49 Analytical Method: SW8260D Matrix: Soil Unit: mg/kg Project: Kirkwood WWTP Sample ID: MB/LCS/LCSD-339405 QC Summary Report for SW8260D Analyte LCS LCSD SPK LCS LCSD LCS/LCSD RPD RPD Result Result Val %REC %REC Limits Limit Acetone 0.22 0.21 0.20 108 103 60-140 4.15 30 tert-Amyl methyl ether(TAME) 0.014 0.014 0.020 71 68 50-140 4.12 30 Benzene 0.015 0.015 0.020 76 75 60-140 2.31 30 Bromobenzene 0.020 0.020 0.020 100 99 60-140 1.51 30 Bromochloromethane 0.018 0.018 0.020 92 91 60-140 1.10 30 Bromodichloromethane 0.016 0.015 0.020 78 77 60-140 1.39 30 Bromoform 0.015 0.014 0.020 74 72 40-140 2.04 30 Bromomethane 0.019 0.019 0.020 97 93 30-140 4.29 30 2-Butanone(MEK) 0.066 0.063 0.080 82 78 50-140 4.63 30 t-Butyl alcohol(TBA) 0.078 0.082 0.080 97 102 50-140 4.80 30 n-Butyl benzene 0.023 0.023 0.020 115 115 60-150 0.0649 30 sec-Butyl benzene 0.023 0.023 0.020 116 114 60-150 1.49 30 tert-Butyl benzene 0.022 0.022 0.020 109 109 60-140 0.226 30 Carbon Disulfide 0.016 0.016 0.020 80 79 50-140 0.820 30 Carbon Tetrachloride 0.017 0.017 0.020 87 87 60-140 0.299 30 Chlorobenzene 0.018 0.018 0.020 93 90 60-140 2.47 30 Chloroethane 0.017 0.017 0.020 84 84 50-140 0.894 30 Chloroform 0.016 0.016 0.020 82 81 60-140 1.87 30 Chloromethane 0.015 0.014 0.020 73 71 20-140 2.39 30 2-Chlorotoluene 0.021 0.021 0.020 105 103 60-140 1.82 30 4-Chlorotoluene 0.021 0.021 0.020 107 107 60-140 0.149 30 Dibromochloromethane 0.018 0.017 0.020 90 87 50-140 3.28 30 1,2-Dibromo-3-chloropropane 0.0090 0.0086 0.010 90 86 30-140 3.91 30 1,2-Dibromoethane(EDB) 0.0093 0.0089 0.010 93 89 40-140 4.22 30 Dibromomethane 0.016 0.016 0.020 81 80 60-140 0.830 30 1,2-Dichlorobenzene 0.018 0.017 0.020 88 87 60-140 1.22 30 1,3-Dichlorobenzene 0.018 0.018 0.020 92 89 60-140 2.95 30 1,4-Dichlorobenzene 0.020 0.020 0.020 99 98 60-140 1.24 30 Dichlorodifluoromethane 0.0070 0.0069 0.020 35 35 10-140 0.375 30 1,1-Dichloroethane 0.017 0.016 0.020 85 81 60-140 3.99 30 1,2-Dichloroethane(1,2-DCA) 0.017 0.016 0.020 83 80 60-140 3.10 30 1,1-Dichloroethene 0.016 0.016 0.020 80 78 60-140 2.74 30 cis-1,2-Dichloroethene 0.017 0.017 0.020 85 84 60-140 1.49 30 trans-1,2-Dichloroethene 0.017 0.017 0.020 87 85 60-140 2.51 30 1,2-Dichloropropane 0.016 0.016 0.020 80 78 60-140 2.94 30 1,3-Dichloropropane 0.017 0.016 0.020 85 82 60-140 3.95 30 2,2-Dichloropropane 0.020 0.020 0.020 102 98 60-140 3.71 30 1,1-Dichloropropene 0.017 0.016 0.020 84 82 60-140 2.35 30 (Cont.) CA ELAP 1644.ORELAP(NELAP)4033 Page 16 of 36