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` Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> X11 Analytical 8 19 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific Environmental Group, Inc Client Project 1D 02133, Stockton, CA <br /> 11315 Sunrise Gold Circle, #M Matrix Water <br /> Rancho Cordova, CA 95742 <br /> Attention Rusty Benkosky OC Sample Group 61 201 81-90 Reported Dec 17, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X enes <br /> Method. EPA 6020 EPA 6020 EPA 8020 EPA 8020 <br /> Analyst B Williams B Williams B Williams B Williams <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#. LCS121296 LCS121296 LCS121296 LCS121296 <br /> Date Prepared 12/12/96 12/12/96 12/12/96 12/12/96 <br /> Date Analyzed 12/12/96 12/12/96 12/12/96 12/12/96 <br /> Instrument 1 D # GCHP 2 GCHP-2 GCHP 2 GCHP-2 <br /> . LCS % <br /> Recovery: 104 111 108 108 <br /> Control Limits 70-130 70-130 70.130 70-130 <br /> MS/MSD <br /> Batch # 6120208 6120206 6120208 6120208 <br /> Date Prepared 12/12/96 12/12/96 12/12/96 12/12/96 <br /> Date Analyzed 12/12/96 12/12/96 12/12/96 12/12/96 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP 2 GCHP 2 <br /> Matrix Spike <br /> Recovery 97 97 98 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 104 103 103 101 <br /> Relative % <br /> Difference 7 0 60 50 4 0 <br /> . SEQUOIA ANALYTICAL Please Note <br /> /J The LCS is a control sample of known interterent 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 /> validation of sample batch results Due to matrix effects the CC limits for MS/MSDs are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 6120181 PES <8> <br />