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H C LABORATORIES <br /> LABORATORIES QUALITY CONTROL REPORT <br /> (Precision & Accuracy) <br /> METHOD 5030/8020/8015M TPH GAS <br /> ATC ASSOCIATES Date of Report 12/16/98 <br /> 126D GRAPHICS DRIVE <br /> MODESTO CA 95351 Sample Matrix Soil <br /> DREW VAN ALLEN <br /> I <br /> Samples Affected 98-13359-1 - 98-13359-18 98-13359-20, 98-13359 21 <br /> II I I I I MS I MSD I I I Precision) I I Accuracy II <br /> II I I Sample I its I MSD I Spike I spike I (Spike I Control I Ms IMS❑ I Control II <br /> 11Constituents 1QC Sample ID I Result I Result I Result I Level I Level (Units IR P D I Limits It Rec 1% Rec I Limits I1 <br /> 1I <br /> JIBenzene 113359-2 ) c 5 I 44 1 99 <br /> 50 1 50 (u4/kg [ 2 ._I 10 1 87 f 89 80 12011 <br /> 11Taluene 13359-2 c 5 99 44 50 50 lycl/kg 101 87 1 BB 1 80 - 12011 <br /> 11Eth l Benzene 13359-2 < 5 44 44 50 50 kq 101 87 1 89 1 80 - 12011 <br /> II &m-X lenes 13359-2 < 10 92 93 100 100 /k 1 --:L0 1 92 1 93 80 - 12011 <br /> 110-Xylene }3359-2 5 46 46 50 50 1pq/kq 101 91 1 92 80 - 12011 <br /> JITotal Petroleum I I I I I I I I I 1 1 I II <br /> 11 HydrOCarbons (gas) 10FW 1 < 50 11039 1 1078 1 980 1 9B0 lµg/L 1 4 1 101106 1110 1 85 - 1151( <br /> i <br /> MS = Matrix Spike MSD = Matrix Spike Duplicate, RPD = Relative Percent Difference <br /> Qualit $ Officer <br /> tho n X <br /> 41 C10 Atlas Ct Bakersfield CA 93308 (805]327-451 1 FAX (805)327-191 B <br />