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Sequoia 680 Chesapeake D. Redwood City CA 94063 (415) 364-9600 FAX(415)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (51[0) 988-9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)911 0100 <br /> WMCON Client Project lid ARCO 2168, Stockton, CA <br /> 1433 N Market Blvd Matrix Water <br /> Sacramento, CA 95834 <br /> Attention Claudio Avila OC Sample Group 7080907-0913 Reported Sep 8, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst- S Phillips S Phillips S Phillips S Phillips <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS082897 LCS082897 LCS082897 LCS082897 <br /> Date Prepared 08/28/97 08/28/97 08/28/97 08/28/97 <br /> Date Analyzed: 08/28/97 08/28/97 08/28/97 08/28/97 <br /> Instrument 1134. GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> 1191 Recovery <br /> Recovery 97 93 92 91 <br /> Control Limits. 70-130 70-130 70.130 70-130 <br /> MS/MSD <br /> Batch#" 7081056 7081056 7081056 7081056 <br /> Date Prepared 08/28/97 08/28/97 08/28/97 08/28/97 <br /> Date Analyzed: 08/28/97 08/28/97 08/28/97 08/28/97 <br /> Instrument I D #- GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> % Recovery 97 87 89 89 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 98 93 93 93 <br /> Relative% <br /> Difference: 10 67 4 4 44 <br /> SEQUOIA ANALYTI L Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents <br /> �y�l�� preparation aro 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 advisory only <br /> Linda C Schneider and are not used to accept or refect batch results <br /> f/ Project Manager/Sacramento Laboratory <br /> 7080907 EMC <6> <br />