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Excelchem Laboratories, Inc. <br />Ancon Environmental <br />570 Business Park Dr. <br />Lincoln, CA 95678 <br />Project. LMH Lathrop <br />Project Number: 1050228 <br />Project Manager: Nolan Ryan <br />Date Reported <br />04/20/21 17.14 <br />Volatile Organic Compounds by GC/MS - Quality Control <br />le Result <br />Reporting <br />Limit Units <br />Spike Source <br />Level Result L unit, RPI) <br />RPD <br />I 'mu • ote. <br />Batch A D0097 - EPA 8260B <br />Blank (A_D0097-BLIC2) Prepared & Analyzed: 04/13/21 <br />Surrogate: Dihmmofluoromethane 52.2 ug kg 50.0 104 70-130 <br />Surrogate: 7aluene-‘18 49.4 50.0 98.8 70-130 <br />Surrogate: 4-Hromofluorobetrzene 516 50.0 105 70-130 <br />Benzene ND 0.005 mg/kg <br />Toluene ND 0.005 <br />Ethylbenzene ND 0.005 <br />mp-Xylene ND 0.01 <br />o-Xylene ND 0.005 <br />Xylenes, total ND 0.01 <br />LCS (A_D0097-0S2) Prepared & Analyzed: 04/13/21 <br />Surrogate: Dibtornolluoromethane 51.2 ug kg 50.0 102 70-130 <br />Surrogate: Toluene-d8 51.2 50.0 102 70-130 <br />Surrogate: 441ronutfluomhenzette 48.6 50.0 97.3 70-130 <br />Benzene 0.02 0.005 n18.1k13 0.0200 101 80-120 <br />Toluene 0.02 0.005 0,0200 105 80-120 <br />1,1 -Dichloroethene 0.02 0.005 0.0200 102 80-120 <br />Chlorobenzene 0.02 0.005 0.0200 102 80-120 <br />Trichloroethene 0.02 0.005 II 0.0200 100 80-120 <br />LCS Dim (A_D0097-BSD2) Prepared & Analyzed: 04/13/21 <br />Surrogate: Dibromofluoromethane 49.4 ug kg 50.0 98.9 70-130 <br />Surrogate: Toluene-d8 51.4 30.0 103 70-130 <br />Surrogate: 4-Bromofluoroben:ene 48.5 50.0 97.1 70-130 <br />Benzene 0.02 0.005 mg/kg 0.0200 97.1 80-120 4.18 15 <br />Toluene 0.02 0.005 0.0200 101 80-120 4.07 15 <br />I, I -Dichloroethene 0.02 0.005 0.0200 96.8 80-120 5.18 15 <br />Chlorobenzene 0.02 0.005 0.0200 98.2 80-120 3.99 IS <br />Trichlorcethene 0.02 0.005 0.0200 98.2 80-120 1.97 IS <br />Excelchem Laboratories. Inc. The results In ilia report apply to the samples analyzed in accordance with the chain of <br />custody document. This analytical report must be reproduced In its entirety. <br />Page 5 of 12 Laboratory Representative