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Sequoia 680 Chesapeake Dnve Redwood City C4 94063 (415) 364 %00 FAX(415) 364 9233 <br /> i 404 N Wgct Lane Walnut Creek CA 94598 (SIO) 988 9600 FAX(510)988 9673 <br /> lice Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> • Pacrfic Environmental Group, Inc Client Project ID 02133, Stockton, CA <br /> 11315 Sunrise Gold Circle, #M Matrix Water <br /> Rancho Cordova, CA 95742 <br /> Attention Rusty Benkosky QC Sample Group 6120181-90 Reported Dec 17, 1996 <br /> ry t r r � v n . v s .. L vl�, v .. f . . v v v L v ry��} .. .. Y♦ S�K6 vC. <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 6020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst B Williams B Williams 8 Williams B Williams <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS 120696 LCS120696 LCS120696 LCS120696 <br /> Date Prepared 12/06/96 12/06/96 12/06/96 12/06/96 <br /> Date Analyzed 12/06/96 12/06/96 12/06/96 12/06/96 <br /> Instrument I D ,# GCHP-2 GCHP-2 GCHP 2 GCHP-2 <br /> LCS % <br /> Recovery 106 108 109 ill <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 6120094 6120094 6120094 6120094 <br /> Date Prepared 12/06/96 12/06/96 12/06/96 12/06/96 <br /> Date Analyzed 12/06/96 12/06/96 12/06/96 12/06/96 <br /> Instrument I D # GCHP 2 GCHP 2 GCHP-2 GCHP 2 <br /> Matrix Spike <br /> % Recovery 101 103 102 104 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 104 107 106 108 <br /> Relative % <br /> Difference 29 38 38 38 <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%recovery data is used for <br /> L r validation of sample batch results Due to matrix effects the OC limits for MS/MSD s are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labora ory <br /> 6120181 PES <5n <br />