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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(9Z5)988-9673 <br /> Sig striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> �� Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br />*acific Environmental Group Clent �rolect 1) Chevron 9-9840, Stockton, CA n <br /> 11315 Sunrise Gold Circle, Ste M Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson QC Sample Group S809342 Reported Oct 15, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Tetra- <br /> Acetone MIRK h drofuran 1,1,1-TCA TCE p-Xylene <br /> Method ISHS ISHS ISHS ISHS ISHS ISHS <br /> Analyst TS TS TS TS TS TS <br /> Concentration <br /> Spiked 4 0 mg/L 1 0 mg1L 2 0 mg/L 1 0 mg/L 1 0 mg/L 0 20 mg/L <br /> LCS Batch# ISSLCSI ISSLCSI ISSLCSI ISSLCSI ISSLCSI ISSLCSI <br /> 100198 100198 100198 100198 100198 100198 <br /> Date Prepared 10/01/98 10/01/98 10/01/98 10/01/98 10/01/98 10/01/98 <br /> Date Analyzed 10/01/98 10/01/98 10101198 10/01/98 10/01/98 10/01/98 <br /> Instrument I D# GCV-01 GCV-01 GCV-01 GCV-01 GCV-01 GCV-01 <br /> LCS % <br /> Recovery 88 98 95 110 100 105 <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MSIMSD <br /> Batch # ISS092598 ISS092598 ISS092598 ISS092598 ISS092598 ISSO92598 <br /> Date Prepared 09/25/98 09/25/98 09/25/98 09/25/98 09/25/98 09/25/98 <br /> Date Analyzed 09/25/98 09/25/98 09/25/98 09/25/98 09/25/98 09/25/98 <br /> Instrument I.D.# GCV-01 GCV-01 GCV-01 GCV-01 GCV-01 GCV-01 <br /> Matrix Spike <br /> % Recovery 95 110 105 120 120 120 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 98 110 110 110 110 110 <br /> Relative% <br /> Difference 26 00 47 87 87 87 <br /> Please Note <br /> The LCS is a control sample of known, interferent free matnx that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL 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 /> L— L and are not used to accept or reject batch results <br /> inda C Schneider <br /> Project Manager/Sacramento Laboratory <br /> S809342 PES <15> <br /> AN!" <br />