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!0 Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364-9233 <br /> 404 N Viget Lane Walnut Creek CA 94598 (510) 988-9600 FAX(S10) 988 9673 <br /> :i) Analytical 819 Striker Avenue Suite 8 Sacramento Ca 95834 (9t6) 921 9,500 FAX(916)921 0100 <br /> 9gro West, Inc Client Project ID SKe11,141 N El Dorado, Stockton, CA <br /> 1 o5o Melody Lane, Ste 160 Matrix Air <br /> Roseville, CA 95678 Reported Aug 8, 1995' <br /> Attention Sudhakar Talanki QC e Sample Group 5080128-129 up A n v <br /> + + • • v 4 v + n <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 C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 2 0 mg/ma 2 0 mg/m1 2 0 mg/m' 6 0 mg/ma <br /> LCS Batch# LCS080495 LCS080495 LCS080495 LCS080495 <br /> Date Prepared 8/4/95 8/4/95 8/4/95 8/4/95 <br /> Date Analyzed 8/4/95 8/4/95 8/4/95 8/4/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP 2 <br /> LCS % <br /> Recovery 98 98 98 98 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 5080155 5080158 5080156 508015$ <br /> Date Prepared 8/4/95 8/4/95 8/4/95 8/4/95 <br /> Date Analyzed 8/4/95 8/4/95 8/4/95 8/4/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 94 91 94 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 93 92 95 94 <br /> Relative <br /> Difference: 1 1 1 1 1 0 1 1 <br /> QUOIA ANALYTICAL Please Note <br /> 7 The LCS is a control sample of known,interferent free matnx that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS o recovery data is used for <br /> validation of sample batch results flue to matrix effects,the QC limits for MS/MSO s are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Protect Manager 5080128 FUG ,<2> <br />