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Department of Toxic Substances Control HML # : 960778 to 960800 <br /> Hazardous Materials Laboratory Coll . # : NKL001 <br /> 2151 Berkeley Way, Berkeley CA. 94704 to NKL023 <br /> (510) 540-3003 <br /> Oualit9 Assurance <br /> pH <br /> Ref • EPA Method # 9045. <br /> I . Calibration Standard Data <br /> Standard ID Lot Expiration Buffer my Efficiency <br /> Vendor/PN No. Date Type Buffer Reading <br /> Merck 415327 ----- Liquid 1. 0 197 . 0 <br /> VWR 951009 10/97 Liquid 4 . 0 30. 3 0.94 <br /> VWR 950815 1 8/97 Liquid 7 . 0 -142 . 2 0. 97 <br /> VWR 950526 05/97 Liquid 10. 0 -303 . 0 0 . 91 <br /> EMS 34119 ---- Liquid 13 . 0 -470. 2 0 . 95 <br /> II. <br /> Laboratory Control Sample <br /> Analyte Lot Results Absolute <br /> pH buffer No. Source Difference <br /> Expected Observed <br /> 1. 00 960285 Fisher 1. 00 1. 02 0. 02 <br /> 4 . 00 960128 Fisher 4 . 00 3 . 96 0. 04 <br /> 7 . 00 960985 Fisher 7 . 00 7 . 02 0. 02 <br /> 10. 0 955105 Fisher 10 . 0 9 . 95 0. 05 <br /> DI H 0 used in dilution: 6. 65 <br /> III. Laboratory Duplicate Sample Results <br /> HML Sample Sample Duplicate Absolute Difference <br /> No. Type Result Result pH units <br /> 960794 Sludge 8 . 66 8 . 66 0. 00 <br /> 960778 Liquid 7 . 14 7 . 11 0. 03 <br /> Analyst: Date: Z 9 <br /> Atif 'R.1 Kozma <br /> Supervisor: Date: <br /> Milad S er <br /> , r <br />