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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 3649600 FAX (415) 364-9233 <br /> 404 N Wiget l-ane Walnut Creek, CA 94598 (5 10) 988 9600 FAX (51o)988-9673 <br /> Analytical 8t9$,,ik,Avenue,Suite 8 tiacrarnento, CA `15834 (9161 `171 96017 fAX 1916)421-01(70 <br /> Oacilic E.nviru iTiwrital Group Client Project 1D: 920-078 1 A/Chevron 9-0557, Stockton, CA <br /> 11315 Sunrise- Gold Circle, Ste. M Matrix Soil <br /> Rancho Cordova. CA 95742 <br /> Attention Roder Hoffmore CSC Sample Group 7100324-0336, 0341, 0344 Reported: Oct 24 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene 3oltlene Benzene X !encs MTBE Methanol <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 ISHS <br /> Analyst: C.Lee C Lee C. Lee C. Lee M.Williams T.Tran <br /> Concentration <br /> Spiked: 0.20 mg/kg 0.20 mg/kg 0.20 mg/kg 0.60 mg/kg 2,500 ug/kg 8.0 mg/kg <br /> LCS Batch#: LCS101597 LCS101597 LCS101597 LCS101597 LCS101897 LCS102097 <br /> Date Prepared: 10/15/97 10/15/97 10/15/97 10/15/97 10/18/97 10/20/97 <br /> Date Analyzed: 10/15/97 10/15/97 10/15/97 10/15/97 10/18/97 10/20/97 <br /> Instrument I-D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 F2 GCV-01 <br /> • LC5 <br /> Recovery: 102 97 94 sa 2,400 95 <br /> Control Limits: 70-130 70-130 70-130 70-130 70-130 50-150 <br /> ..................:...... <br /> MS/MSD <br /> Batch #: 7100293 7100293 7100293 7100293 971088901 BS101597 <br /> Date Prepared: 10/15/97 10/15/97 10/15/97 10/15/97 10/18/97 10/15/97 <br /> Date Analyzed: 10/15/97 10/15/97 10/15/97 10/15/97 10/18/97 10/15/97 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 F2 GGV-01 <br /> Matrix Spike <br /> % Recovery: 108 104 loo 96 96 125 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 108 101 98 95 104 125 <br /> Relative % <br /> Difference: 0.0 2.9 2.0 1.0 4.5 a.0 <br /> SEQUO ANALYTICAL Please Note: <br /> The LOS 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 LOS%recovery data is used for <br /> �l validation of sample batch results, Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Inda C. Schn ider and are not used to accept or reject batch results. <br /> Proiect Manager/Sacramento Labora ory <br /> 71003324.PES <11> <br /> r� <br />