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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> 404 N Wig"Lane Walnut Creek CA 94598 (510) 980-9600 FAX(SIO)988 9673 <br /> Analytical 819 Stnker Avenue,Suite 8 Sacramento CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> WMCON Client Project Ib ADCC?2168, Stockton, CA " <br /> 1433 N Market Blvd Matmc Water <br /> Sacramento, CA 95834 <br /> Attention Claudio Avila QC Sample Group 7080907-0913 Reported Sep 8, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes TRPH <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 SM 5520 CF <br /> Analyst: S Phillips S Phillips S Phillips S Phillips L Martin <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L 4 0 mg/L <br /> LCS Batch#• LCS082997 LCS082997 LCS082997 LCS082997 LCS082297 <br /> Date Prepared: 08/29/97 08/29/97 08/29/97 08/29/97 08/22/97 <br /> Date Analyzed: 08/29/97 08/29/97 08/29/97 08/29/97 08/22/97 <br /> Instrument I�+D #- GCHP-7 GCHP-7 GCHP-7 GCHP-7 IR-1 <br /> . LCS <br /> Recovery* 100 94 93 93 98 <br /> Control Limits: 70.130 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch#• 7081120 7081120 7081120 7081120 BS082297 <br /> Date Prepared: 08/29/97 08/29/97 08/29/97 08/29/97 08/22/97 <br /> Date Analyzed: 08/29/97 08/29/97 08/29/97 08/29/97 08/22/97 <br /> Instrument I D #- GCHP 7 GCHP-7 GCHP-7 GCHP 7 IR-1 <br /> Matrix Spike <br /> % Recovery- 94 90 89 Be 98 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 94 89 88 84 95 <br /> Relative% <br /> Ddference: 00 11 11 24 31 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents <br /> ? % preparation and analytical methods employed for the samples The LCS eLc ary data is used for <br /> xr"elt �/ validation of sample batch results Due to matrix effects,the QC limits for MSrMSD's are advisory only <br /> Linda Schneider and are not used to accept or reject batch results <br /> / Project Manager/Sacramento Laboratory <br /> ✓/ 7080907 EMC <7> <br />