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GeoAnalytical Laboratories, Inc. <br /> 1405 Kansas Avenue Phone (209) 572-0900 <br /> Modesto, CA 95351 FAX (209) 572-0916 <br /> QC REPORT <br /> Report# J072-06 Date: 4/3/98 <br /> Lab ID J20353 Dates Analyzed: 03/13/98-03/20/98 <br /> Wright Environmental Services, Inc. Method: TTLC <br /> 4220 Commercial Drive #5 <br /> Tracy CA 95376 <br /> Samples Analyzed: J20352,20353,20354 <br /> Sample Spiked: J20353 <br /> Analyte Matrix Spike Matrix Spike Relative Blank <br /> % Duplicate % Percent <br /> Difference (%) <br /> Antymony 110 110 0.0 ND <br /> Arsenic 87.5 97.5 10.8 ND <br /> Barium 103 106 2.8 ND <br /> Beryllium 106 108 1.9 ND <br /> Cadmium 100 100 0.0 ND <br /> Chromium 104 106 1.9 ND <br /> Cobolt 106 106 0.0 ND <br /> Copper 104 104 0.0 ND <br /> Lead 108 107 0.9 ND <br /> Mercury 95.0 92.0 3.2 ND <br /> Molybdenum 96.0 98.0 2.1 ND <br /> Nickel 104 102 1.9 ND <br /> Selenium 110 106 3.7 ND <br /> Silver 106 106 0.0 ND <br /> Thallium 98.0 95.0 3.1 ND <br /> Vanadium 99.0 100 1.0 ND <br /> Zinc 96.0 94.0 2.1 ND <br /> Ramiro Salgado Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />