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a) Sequoia 680 Chesapcake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N Wigct Lane Walnut Creek CA 94598 1510) 988 9600 FAX (510) 988 9673 <br /> lQr Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)911 0100 <br /> Welta Environmental Consultants Client Project ID ' Dixon #7-3708,1 Stockton, CA <br /> 3164 Gold Camp Dr, Suite 200 Matrix Water <br /> Rancho Cordova, CA 95670 <br /> Attention Todd Galati CC Sample Group 512-1440 deported Jan 5, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xyienes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: B Williams B Williams 13 Williams 8 Williams <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#• LCS010496 LCS010496 LCS010496 LCS010496 <br /> Date Prepared 01/04/96 01/04/96 01/04/96 01/04/96 <br /> Date Analyzed 01/04/96 01/04/96 01/04/96 01/04/96 <br /> Instrument I.D # GCHP 2 GCHP 2 GCHP 2 GCHP-2 <br /> LCS <br /> Recovery* sa 94 se 93 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # BS010496 BS010496 BS010496 95010496 <br /> Date Prepared- 01/04/96 01/04/96 01/04/96 01/04/96 <br /> Date Analyzed: 01/04/96 01/04/96 01/04/96 01/04/96 <br /> Instrument 1.13 #- GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery- 95 96 98 97 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery- 99 97 100 99 <br /> Relative % <br /> Difference 41 10 20 31 <br /> SEQUOIA ANALYTICAL Please Note <br /> �l The LCS is a control sample of known interferent tree matrix that is analyzed using the same reagents <br /> preparation and analytical methods employed for the samples The LCS a recovery data is used for <br /> validation of sample batch results flue to matrix effects the QC limits for MS/MSDs are advisory only <br /> Linda C Schneider and are not used to accept or reject patch results <br /> Project Manager/Sacramento Laboratory <br /> 5121440 DLT �'> <br /> _c' <br />