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Department of Toxic Substances Control HML # : 960767 to 960768 <br /> Hazardous Materials Laboratory Coll. # : NKL001 <br /> 2151 Berkeley Way, Berkeley CA. 94704 to NKL002 <br /> (510) 540-3003 <br /> Ouality 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 /> Fisher 960128 12/97 Liquid 4 . 0 29 . 1 <br /> Fisher 960985 2/98 Liquid 7 . 0 -148 . 1 1. 02 <br /> Fisher 955105 11/97 Liquid 10. 0 -311. 7 0.94 <br /> II. <br /> Laboratory Control Sample <br /> Analyte Lot Results Absolute <br /> pH buffer No. Source Difference <br /> Expected Observed <br /> 4 . 00 9510098 VWR 4 . 00 4 . 02 0. 02 <br /> 7 . 00 9508152 VWR 7 . 00 7 . 04 0. 04 <br /> DI H.0 used in dilution: <br /> III. Laboratory Duplicate Sample Results <br /> HML Sample Sample Duplicate Absolute Difference <br /> No. Type Result Result pH units <br /> Analyst: (i Date: /-21a7,/� <br /> Atif z n <br /> supervisor:— <br /> - - - C::�' . / Date: /z/2J/yam <br /> M lad S. I kanderf <br />