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Page 6 IT FIELD ANALYTICAL SERVICES <br /> 4585 PACIMCO BOULEVARD <br /> Client, PAC BELL STOCKTON MARTINEZ, CA <br /> Project 190916 <br /> Ouality Control Results <br /> Matrix Spike/Matnx Spike Duphcate Recovery Summary <br /> MS MSD Relative <br /> Compound Amount Spiked % Recovery % Recovery % Difference <br />' Benzene 50 ug/L 955 96.2 07 <br /> Toluene 50 ug/L 935 98.4 5.1 <br /> Gasoline 1 mg/L j 114 102 6 <br /> 1 <br /> MS = Matrix Spike <br /> MSD = Matnx Spike Duplicate <br /> 1 <br /> 1 <br /> o82A 192 <br />