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Department of Toxic Substances Control HML #: 931083 to 931084 <br /> Hazardous Materials Laboratory Coll. #: 111893DD2A <br /> 2151 Berkeley Way, Berkeley CA.94704 to : 111893DPlA <br /> (510) 540-3003 <br /> Quality Assurance <br /> R <br /> Ref : EPA Method # 9040 <br /> I. Calibration Standard Data <br /> Standard ID Expiration Buffer my <br /> Vendor/PN Lot No. Date Type Buffer Reading Efficiency <br /> Baxter MO78 3/95 Liquid 4.0 176. 6 <br /> Baxter AO38 4/95 Liquid 7. 0 1.90 0.99 <br /> Baxter MO38 9/94 Liquid 10. 0 -166.7 0.96 <br /> EM Science 23040 ---- Liquid 13 . 0 -325.8 0.91 <br /> II. <br /> Laboratory Control Sample <br /> Analyte Lot Results Absolute <br /> pH buffer No. Source Expected Observed Diff. <br /> 5. 00 931330 Fisher 5. 00 5. 01 0. 01 <br /> 8.00 931332 Fisher 8.00 7.98 0. 02 <br /> 12 .0 113601 EMS 12 . 0 12.01 0. 01 <br /> DI H2O used in dilution 6. 66 <br /> i <br /> III. Laboratory Duplicate Sample Results <br /> HML Sample Sample Dupl. Absolute Difference <br /> No. Type Result Result pH units <br /> 931083 solid 7.43 7.24 0. 19 <br /> Analyst: Date: 3 � f� <br /> Ati R. K z an rt <br /> Supervisor: Date:-311619(4 _ <br /> Mild S. Is an er . <br />