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Sequoia 680 Chesapeake Drive Redw'.)d City,CA 94063 (415) 364.9600 FAX(415) 364.9333 <br /> 404 N. Wiget Lane Walnut Creek,CA 94598 (510) 988.9600 FAX(510)988.9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921.0100 <br /> Pacific Environmental Group, Inc. Client Project ID Arco 2093,"Tracy, CA <br /> 11315 Sunrise Gold Circle. #M Matrix: Water <br /> Rancho Cordova, CA 95742 <br /># Attention Greg Barclay QC Sample Group 6020578-0590 Reported: Feb 21, 1996'- <br /> 1 <br /> f <br /> QUALITY CONTROL DATA REPORT <br /> k <br /> r <br /> Ip <br /> 1 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: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> ii <br /> LCS Batch#: LCS021996 LCS021996 LCS021996 LCS021996 <br /> I i <br /> Date Prepared: 02/19/96 02/19/96 02/19/96 02/19/96 <br /> Date Analyzed: 02/19/96 02/19/96 02/19/96 li02/19/96 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 I <br /> LCS % <br /> Recovery: 88 87 94 90 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> .. li <br /> is - ---- - - ..................... -- -- <br /> ....:...:....:.....:....�:..n..:..... ----.._ -- ---- <br /> ...: :.... .......... ....:.... .....-:... ---..-......::-ii:ii:�:�:�:v:�}::C.:C.::.}:-:.:::. ----- - <br /> MS/MSD !� <br /> Batch#: 6020531 6020531 6020531 6020531 a <br /> Date Prepared: 02/19/96 02/19/96 02/19/96 102/19/96 <br /> i <br /> Date Analyzed: 02/19/96 02/19/96 02/19/96 ,,02/19/66 <br /> Instrument 1.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 l <br /> Matrix Spike <br /> %Recovery: 90 89 91 91 I <br /> i' <br /> Matrix Spike <br /> i Duplicate % <br /> I Recovery: 92 91 93 l .93 r <br /> Relative% <br />!f Difference: 2.2 2.2 2.2 :1 2.2 <br /> f SEQUOIA ANALYTICAL Please Note: it <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 sample batch results. Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Janet rlan and are not used to accept or reject batcY results. <br />'I Projec Manager/Sacramento Laboratory <br /> 6020578-PES <4> <br />