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Y_ A Y <br />California Department of Toxic Substances Control <br />Hazardous Materials Laboratory <br />2151 Berkeley Way, Berkeley, Ca 94704 <br />Quality Assurance <br />pH <br />Procedure: pH by electrometric method Reference: EPA 9040 & 9045 <br />I. Calibration Standard Data <br />ID Vendor <br />PN <br />Lot <br />No. <br />Exp. <br />Date <br />Buffer <br />I Type <br />pH <br />I Buffed <br />my <br />Reading <br />Efficiency <br />FISHER <br />960122-24 <br />11/97 <br />SOL'N <br />2.00 <br />144.3. <br />8.94 <br />VWR <br />9510098 <br />10/97 <br />SOL'N <br />4.00 <br />30.6 <br />0.97550 <br />VWR <br />9508152 <br />8/97 <br />SOL'N <br />7.00 <br />-145.1 <br />1.0068 <br />VWR <br />950566 <br />5/97 <br />SOL°N <br />10.00 <br />-314.2 <br />0.97050 <br />TT- Laboratory Control Sample <br />pH <br />Buffer <br />Lot Source <br />No. <br />Expected <br />Result <br />Observed <br />Result <br />Absolute <br />Diff. <br />3.00 <br />953674-24 FISHER <br />3.00 <br />2.96 <br />0.04 <br />9.00 <br />955170-24 FISHER <br />9.00 <br />8.94 <br />0.06 <br />s pH of DI H2O used in dilution 6.54 <br />III. Laboratory Duplicate Sample Results <br />HML <br />No. <br />ISample <br />Type <br />I Sample <br />Result <br />I Dupl. <br />Result <br />I Absolute I <br />Difference <br />960261 <br />SOLID <br />7.498 <br />7.499 <br />0.01 <br />960306 <br />LIQUID <br />1 6.618 <br />6.620 <br />0.02 <br />Analyst:�IDate: <br />-�gida ay <br />Supervisor: Date: <br />kilad S.—!�skandeif <br />