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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 (925)988-9600 FAX(925)988-9673 <br /> a- Analytical 819 Striker Avenue Suite S Sacramento CA 95834 (916)921-9600 FAX(916)921 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br />*acific Environmental Group Client project ilk Chevron 9-9840, Stockton, CA <br /> 11315 Sunrise Gold Circle, Ste M Matrix Solt <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson QC Sample Group S809342 Reported Oct 15, 1998 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Tetra- <br /> Acetone MIRK hydrofuran 1,1,1-TCA TCE p-X leve <br /> Method: ISHS ISHS ISHS ISHS ISHS ISHS <br /> Analyst: TS TS TS TS TS TS <br /> Concentration <br /> Spiked: 4 0 mglL 10 mglL 2 0 mg/L 1 0 mg1L 1 0 mg/L 0 20 mg1L <br /> LCS Batch#. ISSLCSI ISSLCS1 ISSLCS1 ISSLCS1 ISSLCS1 ISSLCS1 <br /> 100998 100998 100998 100998 100998 100998 <br /> Date Prepared: 10/09/98 10/09/98 10/09/98 10/09/98 10/09/98 10/09/98 <br /> Date Analyzed 10/09/98 10/09/98 10/09/98 10/09/98 10/09/98 10/09/98 <br /> Instrument I D#: GCV-01 GCV-01 GCV-01 GCV-Oi GCV-01 GCV-01 <br /> i <br /> LCS% <br /> Recovery 93 100 105 93 94 90 <br /> i <br /> Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> i <br /> MS/MSD <br /> Batch# ISS100298 ISS100298 ISS100298 ISS100298 ISS100298 ISS100298 <br /> Date Prepared. 10/02/98 10/02/98 10/02/98 10/02/98 10/02/98 10/02/98 <br /> Date Analyzed 10/02/98 10/02/98 10/02/98 10/02/98 10/02/98 10/02/98 <br /> Instrument I D# GCV-01 GCV-01 GCV-01 GCV-01 GCV-01 GCV-01 <br /> Matrix Spike <br /> % Recovery* 90 110 100 110 110 105 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery" 90 110 100 110 110 105 <br /> Relative% <br /> Difference 00 00 00 00 00 00 <br /> Please Note <br /> The LCS is a control sample of known, Interferent free matnx that is analyzed using the same reagents, <br /> SEQUOIA ANALYTH'All 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 MSIMSD's are advisory only <br /> �D— and are not used to accept or reject batch results <br />*inda C Schneider <br /> rolect Manager/Sacramento Laboratory <br /> S809342 PES <16> <br />