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Superior Priecisiorn Analytical, /rnc. <br /> PO Box 1545 - Martinez California 94553 - (S 10) 229-1590 / fax (510) 229-0916 <br /> ANALYSIS FOR SOLUBLE METALS <br /> Quality Assurance and Control Data - Extract <br /> Laboratory Number 88954 <br /> Average <br /> Method Spike <br /> Compound Blank PQL Recovery Limits RPD <br /> (mg/L) (mg/L) (°s) (%) (%) <br /> Cadmium (Cd) : ND<O 5 0 5 980-. 75--125 1% <br /> Chromium (Cr) ND¢0 5 0 5 9906 75-125 00-0 <br /> Copper (Cu) ND<O 5 0 5 1040-. 75-125 1's <br /> Lead (Pb) . ND<0 . 5 0 . 5 10216 75--125 1% <br /> Nickel (Na.) ND<O 5 0 . 5 96% 75-125 1% <br /> Zinc (Zn) ND<O 5 0 5 1069w 75-125 1% <br /> Definitions <br /> ND = Not Detected RPD = Rel tive P ent Difference <br /> PQL = Practical Quantitation Limit <br /> QC File No 88954 - <br /> Senior Analyst <br /> Page 3 of 3 <br /> 9 <br /> Certified Laboratories <br />