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California Department of Toxic Substances Control HML#020579 to 020580 <br /> Hazardous Materials Laboratory(Inorganic Section) Collector's# PR 01 to PR 02 <br /> 2151 Berkeley Way, Berkeley, CA 94704 <br /> Tel No. (510) 540-3003 <br /> QUALITY ASSURANCE <br /> pH <br /> I. Calibration Standard File Reference: EPA9040B <br /> Source Lot No. Expiration Buffer Buffer my Efficient <br /> Date Type Reading <br /> EMSCience 1071 Mar-03 Liquid 1.00. 334.2 - <br /> EMSCience 1100 Apr-03 Liquid 4.00 165 0.97464 <br /> EMSCience 1105 Apr-03 Liquid 7.00 -7.9 0.99635 <br /> EMSCience 2098 Mar-03 Liquid 10.00 -178.3 0.98112 <br /> EMSCience 37325 Ampule Liquid 13.00 -341.8 0.94095 <br /> II. Laboratory Control Sample <br /> Analyte Source Lot No. Expir'n. Result Absolute <br /> pH Buffer Date Expctd Observed Difference <br /> 2.00 VW R 1247 Aug-03 2.00 1.977 0.023 <br /> 9.00 VWR 1038 Jan-03 9.00 8.863 0.037 <br /> III Laboratory Duplicate Sample Results <br /> HML No. Sample Sample Dupl. Absolute Difference <br /> Type Result Result pH units <br /> 020595 Liquid 4.21 4.21 0 <br /> Analyst: Date: <br /> Kas6yap N. Thakore <br /> Public Health Chemist I i <br /> Date: as <br /> Gurmail S. Sivia <br /> 6 <br /> Public Health Chemist III (Specialist) <br />