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j SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue - Suite LM - Concord,California 94520 <br /> (510) 686-9600 - FAX (510) 686-9689 <br /> .:r`.. �rr.vr:;"^�o"Ycati�h..� . wfi+-.2 •v rt <br /> Associates 4 -rS4r ¢ <br /> Client Pr'6id t iD ARC( " �i59 -6A Tracy <br /> ux <br /> 1855 Gateway Bird , Ste 770 Matrix Water <br /> Concord, CA 94520 <br /> Attention Paul Sample QC Sample Group 307-1061 deported Aug 4, 1993 <br /> „ <br /> QUALITY CONTROL DATA REPORT <br /> J----ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> ' Analyst: J F J F J F J F <br /> Conc. Spiked. 20 20 20 20 <br /> Units: lig/L Ng/L ug/L N9/L <br /> ' LCS Batch#. i LCS080393 1 LCS080393 1 LCS080393 1 LCS080393 <br /> Date Prepared: 8/3/93 8/3/93 8/3/93 8/3/93 <br /> IDate Analyzed: 8/3/93 8/3/93 8/3/93 8/3/93 <br /> nstrument I.D.#. HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> to Recovery: 100 107 110 122 <br /> Control Limits: 70-130 70-130 70-130 70-130 <br /> ln'z <br /> Sti. v� . '.Yu{v?nJvir ' n+n ,VJhvSn v v vJ +nn l,.J r r ♦rn4`r r. • r , jtiurrr } yr r r ' r 4 } Ji <br />' MS/MSD <br /> Batch#: 3071185 3071185 3071185 3071185 <br /> Date Prepared. 8/3/93 8/3/93 8/3/93 8/3/93 <br /> Date Analyzed. 8/3/93 8/3/93 8/3/93 8/3/93 <br /> nstrument I D#: HP-2 HP-2 HP-2 HP-2 <br /> i <br />' Matrix Spike <br /> % Recovery. 110 110 115 115 <br />' Matrix Spike <br /> Duplicate% <br /> Recovery: 100 100 100 102 <br />' Relative% <br /> Difference: 95 95 14 12 <br />&EQUOIA AN ICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation an ical methods employed for the samples The LCS%recoverydata is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Lenneth K F Lee and are not used to accept or reject batch results <br /> Laboratory Director <br /> 3071061 ROU <2 s <br />