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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 fAX(510)988-9673 <br /> filly Analytical 819 Striker Avenue,Suite 9 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> Pacific Environmental Group Client Project ID: Unocal #1205, Lathrop, CA <br /> 11315 Sunrise Gold Circle, Ste. M Matrix: Water <br /> Rancho Cordova, CA 95742 <br /> Attention: Rusty Benkosky OC Sample Group: 711-1173 Reported: Dec 3, 1997'- <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Reactive Reactive <br /> Heptachlor Aldrin Dieldrin Cyanide Cyanide <br /> Method: EPA 8080 EPA 8080 EPA 8080 SW-846 SW-846 <br /> Analyst: L.Bettencourt L.Bettencourt L.Bettencourt P.Sandrak P.Sandrak <br /> Concentration <br /> Spiked: 0.10Ng/L 0.10Ng/L 0.20Ng/L 0.20 mg/L 25 mg/L <br /> LCS Batch#: LCS112497 LCS112497 LCS112497 LCS112497 LOS110497B <br /> Date Prepared: 11/24/97 11/24/97 11/24/97 10/28/97 11/04/97 <br /> Date Analyzed: 11/26/97 11/26/97 11/26/97 11/24/97 11/24/97 <br /> Instrument I.D.#: GCHP4B GCHP-4B GCHP4B Manual Manual <br /> LCS % <br /> Recovery: 107 102 110 15 64 <br /> Control Limits: 40-140 40-140 40-140 8.0-40 70-130 <br /> MS/MSD <br /> Batch#: BS112497 BS112497 BS112497 9711011-04 9711C11-04 <br /> Date Prepared: 11/24/97 11/24/97 11/24/97 11/24/97 11/24/97 <br /> Date Analyzed: 11/26/97 11/26/97 11/26/97 11/24/97 11/24/97 <br /> Instrument I.D.#: GCHP-4B GCHP-4B GCHP4B Manual Manual <br /> Matrix Spike <br /> %Recovery: 107 102 110 23 56 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 103 94 101 22 38 <br /> Relative% <br /> Difference: 4.0 8.0 9.0 4.6 37 <br /> Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQLJOIA ANALYTICAL preparation and analytical methods employed for the samples. The LCS%recovery data is used for <br /> /7 validation of sample batch results. Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Airn <br /> and are not used to accept or reject batch results. <br /> C. Schneider t Manager/Sacramento Laboratory <br /> 7111173.PES <6> <br />