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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 404 N Wiget lane Walnut Creek C4 94598 (510) 988 9600 FAX(510) 988 9673 Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 Pacific Environmental Group Client Project ID 920-119 1 A/Chevron 9-6171 11315 Sunrise Gold Circle, Ste M Matrix Sad Rancho Cordova, CA 95742 Attention Tim Anenson OC Sample Group 801-0987 Reported Feb 12, 1998 QUALITY CONTROL DATA REPORT ANALYTE 24-Dinitro- Penta- Acenaphthene 4-Nitro henol toluene chlorophenol Pyrene Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 Analyst L Diaz L Diaz L Diaz L Diaz L Diaz Concentration Spiked 3,330 Ng/kg 5 000 Mg/kg 3,330,ug/kg 5,000 pg/kg 3,330 ug/kg LCS Batch# BLK020398 BLK020398 BLK020398 BLK020398 BLK020398 Date Prepared 02/03/98 02/03/98 02/03/98 02/03/98 02/03/98 Date Analyzed 02/04/98 02/04/98 02/04/98 02/04/98 02/04/98 Instrument I D # GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 LCS % Recovery 76 81 74 77 76 Control Limits 31-137% 11 114% 28-89% 17-109% 35-142% MS/MSD Batch# BLK020398 BLK020398 BLK020398 BLK020398 BLKG20398 Date Prepared 02/03/98 02/03/98 02/03/98 02/03/98 02/03/98 Date Analyzed 02/04/98 02/04/98 02/04/98 02/04/98 02/04/98 Instrument I D # GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 Matrix Spike % Recovery 76 81 74 77 76 Matrix Spike Duplicate % Recovery 76 81 79 77 80 Relative% Difference 039 049 54 026 58 46$EQUOIA ANALYTIC3L Please Note The LCS is a control sample of known, interferent free matrix that is analyzed using the same reagents, G" L�� rG Gam, preparation and analytical methods employed for the samples The LCS%recovery data is used for (G L� / validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only nda C Schneider and are not used to accept or reject batch results Project Manager/Sacramento Laboratory Page 2 of 2 8010987 PES <12> z�