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Sequoia 680 Chesapeake Dave Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 to)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 1W <br /> • EMCON Client Project ID IBC-Stockton <br /> 1433 N Market Blvd Matrix Water <br /> Sacramento, CA 95834 <br /> Attention Claudio Avila OC Sample Group 7110991-0992 Reported Dec 4, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes MTBE <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Analyst S Phillips S Phillips S Phillips S Phillips L Duong <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L 50 ug/Lr� �� <br /> LCS Batch# LCS112597 LCS112597 LCS112597 LCS112597 LCS112697 <br /> DEC - 8 997 <br /> Date Prepared 11/25/97 11/25/97 11/25/97 11/25/97 11/26/97 <br /> Date Analyzed 11/25/97 11/25/97 11/25/97 11/25/97 11/26/97 <br /> Instrument i D # GCHP-7 GCHP 7 GCHP-7 GCHP-7 F2 <br /> LCS <br /> Recovery 124 107 98 96 104 <br /> Control Limits 70-130 70 130 70-130 70 130 70 130 <br /> MS/MSD <br /> Batch # 7111001 7111001 7111001 7111001 9711621-03 <br /> Date Prepared 11/25/97 11/25/97 11/25/97 11/25/97 11/26/97 <br /> Date Analyzed 11/25/97 11/25/97 11/25/97 11/25/97 11/26/97 <br /> Instrument I D # GCHP 7 GCHP-7 GCHP-7 GCHP-7 F2 <br /> Matrix Spike <br /> Recovery 123 109 98 98 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 121 108 98 97 102 <br /> Relative % <br /> Difference 16 092 00 1G 20 <br /> SECIU IA ANALYTICAL Please Note <br /> . The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> I preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects the OC limits for MS/MSD s are advisory only <br /> inda C Schneider and are not used to accept or refect batch results <br /> Project Manager/Sacramento Laboratory <br /> 7110991 EMC <4> <br />