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` f \ Sequoia680 Chcsapcake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> + 404 N Wig,t Lan, Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Stnkcr Avcnuc Suit,a Sacramcnco CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific Environmental Group, Inc Client Project ID+ 02133, Stockton, CA u. <br /> 11315 Sunrise Gold Circle, #M Matrix Water <br /> Rancho Cordova, CA 95742 <br /> Attention Rusty Benkosky QC Sample Group 6120181-90 v Y Reported hDec 17, 1996 <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 B Williams B Williams <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS121196 LCS121196 LCS121196 LCS121196 <br /> Date Prepared 12/11/96 12/11/96 12/11/96 12/11/96 <br /> Date Analyzed 12/11/96 12/11/96 12/11/96 12/11/96 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP 1 GCHP-1 <br /> LCS % <br /> Recovery 93 98 99 97 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 6120292 6120292 6120292 6120292 <br /> Date Prepared 12/11/96 12/11/96 12/11/96 12/11/96 <br /> Date Analyzed 12/11/96 12/11/96 12/11/96 12/11/96 <br /> Instrument I D # GCHP 1 3CHP-1 GCHP 1 GCHP 1 <br /> Matrix Spike <br /> % Recovery 94 99 99 97 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 96 100 100 100 <br /> Relative% <br /> Difference 21 10 10 30 <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 /> validation of sam le batch results Due to matrix effects the OC limits for M5/MSD s 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 <7> <br /> z- <br />