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California Environmental Protection Agency <br /> Department of Toxic Substances Control HML # : 950291 to 950294 <br /> Hazardous Materials Laboratory Collctr' s # : HPM-0975-2 <br /> 2151 Berkeley Way, Berkeley, CA 94704 to: HPM-0975-5 <br /> Tel . No. (510) 540-3003 <br /> quality Assurance <br /> PH <br /> Reference: EPA Method 9040 <br /> I . Calibration Standard Data <br /> Standard ID Expirat'n Buffer my <br /> Vendor/PN Lot No. Date Type Buffer Reading Efficiency <br /> EM SCIENCE 34066 03/96 Liquid 7 . 00 -120. 7 <br /> EM SCIENCE 34115 04/96 Liquid 10. 00 -300. 0 1. 0242 <br /> EM SCIENCE 33228 Liquid 13 . 00 7461. 1 0 . 91583 <br /> II . Laboratory Control Sample <br /> Analyte Lot Result Absolute Difference <br /> pH buffer No. Source Expectd Observd <br /> 7 . 00 DO28 BAXTER 7 . 00 6. 94 0. 06 <br /> 13 . 0 33228 EMSCIENCE 13 . 0 12 . 90 0. 100 <br /> pH of DI H2O used in dilution 6 . 67 <br /> III. Laboratory Duplicate Sample Results <br /> HML Sample Sample Dupl . Absolute Difference <br /> No. Type Result Result pH units <br /> 950291 Liquid 9 . 95 9 . 97 0. 02 <br /> 950292 Dust 12 .875 12 . 87 0. 005 <br /> Analyst: Date: GO p <br /> enaida Od' <br /> Supervisor: Date: <br /> Milad S. Iskander <br />