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SEQUOIA ANALYTICAL <br /> L 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> , +e k+oahe4 ,rh ,. <br /> uz Associates "` then+t�F�r`ojet YD 4 A ARCO #2493=9 =i;Trac"y <br /> 1855 Gateway Blvd , Ste 770 Matrix Sod <br /> Concord, CA 94520 <br /> , Attention Paul Su�?ple CC Sample Group 308-0120 Reported Aug 9, 1993 <br /> y > ' Y. L , r+� ' ,. r, },..r n rr ,.,,c h nr .'w�o�,o,a , ,. ';�r?r;S•�:�' .s ... .,... r <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8024 EPA 8020 EPA 9020 <br />' Analyst J F J F J F J F <br /> Conc. Spiked 040 044 0 40 12 <br /> Units mg/Kg mg/Kg mg/Kg mg/Kg <br /> LCS Batch#: 1 LCS080693 1 LCS080693 1 LCSD80693 1 LCS080693 <br /> Date Prepared, 8/6/93 8/6/93 9/6/93 8/6/93 <br /> Date Analyzed- 8/6/93 8/6/93 9/6/93 9/6/93 <br /> nstrument I.D.#. HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 98 107 112 118 <br /> Control Limits. 70-130 70-13o 74-130 70-130 <br />' MS/MSD <br /> Batch#• 3071665 3071665 3071665 3071665 <br /> Date Prepared, 9/6/93 8/6/93 8/6/93 8/6/93 <br /> Date Analyzed. 8/6/93 8/6/93 8/6/93 8/6/93 <br /> nstrument LD #. HP-2 HP-2 HP-2 HP-2 <br />' Matrix Spike <br /> % Recovery. 80 80 80 122 <br />' Matrix Spike <br /> Duplicate% <br /> Recovery. 80 80 80 120 <br />' Relative % <br /> Difference o 0 00 00 16 <br />&E1Q1U0,1A ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> d analytical methods employed for the samples The LCS%recovery data Is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisoryonly <br /> and are not used to accept or reject batch results <br /> enneth K F Lee <br /> Laboratory Director <br />' 3080120 ROU <2> <br />