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Su erior Precision Ana/ nc. <br /> 1 p �ical, I <br /> 325 Arnold Drue Suite Mortfre: C_ahfcrn�z Q-5=3 . 5 10 5 <br /> C E R T I F I C A T E O F V L Y S I S <br /> LABORATORY NO . 83915 DATE RECEDED 09/13/91 <br /> 1 CLIENT Harding Lawson -associates , Concord DATE REPORTED 09/20/91 <br /> CLIENT JOB NO . 17060 , 025 03 DATE SAMPLED 09/12/91 <br /> ANALYSIS FOR BENZENE , TOLUENE , ETHYL BENZENE & XYLENES <br /> by EPk SW-846 Methods 5030 and 8020 <br /> Concentration( ug/L7 <br /> LAB Etnyl <br /> ' n Sample Identification Benzene Toluene Benzene `Hylenes <br /> 1 1 MW-1 65 1 0 9 9 1 2 . 7 <br /> 2 MW-2 ND <0 . 3 ND <0 3 ND <0 . 3 ND <0 . 3 <br /> 3 MW-3 ND <0 3 ND <0 3 ND <0 3 ND <0 3 <br /> 4 MW-4 ND <0 . 3 ND <0 . 3 ND <0 . 3 ND <0 . 3 <br /> 1 5 MW-5 ND <0 . 3 ND <0 . 3 ND <0 . 3 ND <0 . 3 <br /> 6 MW-6 ND <0 3 ND <0 . 3 ND <0 . 3 ND <0 3 <br /> 7 MW-8 600 31 150 140 <br /> 8 MW-9 6200 430 2200 2700 <br /> 9 MW-10 15000 470 2500 8500 <br /> 10 MW-11 ND <0 . 3 ND <0 . 3 ND <0 . 3 ND <0 . 3 <br /> 1 11 MW-12 ND <0 . 3 ND <0 3 ND <0 . 3 ND <0 . 3 <br /> 12 MW-13 ND <0 . 3 ND <0 . 3 ND <0 . 3 ND <0 . 3 <br /> 13 MW-14 ND <0 . 3 ND <0 . 3 ND <0 . 3 ND <0 . 3 <br /> 14 MW-15 ND <0 . 3 ND <0 . 3 ND <0 . 3 ND <0 3 <br /> ug/L - parts per billion (ppb ) <br /> Method Detection Limit in Water. 0 . 3 ug/L <br /> QAQC Summary <br /> ' Daily Standard run at 20ug/L RPD = <15% <br /> MS/MSD Average Recovery =92% Duplicate RPD = <6 <br /> ' Richard Srna, Ph. D <br /> Laboratory Director <br /> Certified Laboratories <br />�� 1 <br />