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10 ` Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (4t5) 364-9600 FAX(415) 364-9233 <br /> 404 N. Wiget Lane Walnut Creek, CA 94598 (510) 988.9600 FAX(510)988-9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921.9600 FAX(916)921.0100 <br /> Pacific Ewe onmental Group, Inc. Client Project ID: Arc6'4'34,Lodl,'CA <br /> 11315 Sunrise Gold Circle, #M Matrix: Water <br /> Rancho Cordova, CA 95742 <br /> Attention Greg Barclay QC Sample Group 6090273-84 Reported: Se 23, 1996-::: <br /> P P <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 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#: LCS091896 LCS091896 LCS091896 LCS091896 <br /> Date Prepared: 09/18/96 09/18/96 09/18/96 09/18/96 <br /> Date Analyzed: 09/18/96 09/18/96 09/18/96 09/18/96 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery: 99 100 102 104 <br /> Control Limits: 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch #: 6090277 6090277 6090277 6090277 <br /> Date Prepared: 09/18/96 09/18/96 09/18/96 09/18/96 <br /> Date Analyzed: 09/18/96 09/18/96 09/18/96 09/18/96 <br /> Instrument I.Q.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery: 98 99 100 99 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 101 103 104 104 <br /> Relative% <br /> Difference: 3.0 4.0 3.9 4.9 <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 sample batch results. Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> ;nda C. Schneider and are not used to accept or reject batch results. <br /> Project Manager/Sacramento Labors ary <br /> 6090273.PES <6> <br /> Y•,-4 <br />