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' Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (650) 364 9600 FAX(650)364 9233 rY' 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 Analytical 819 Stnker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 Pacific E�nvlronmental Group Client Project ID 920122 1A/Chevron 9-9840 11315 Sunrise Gold Circle, Ste M Matrix Sod Rancho Cordova, CA 95742 Attention Tim Anenson QC Sample Group 8030071-0G73, 0077 Reported Mar 11, 1998 QUALITY CONTROL DATA REPORT ANALYTE 2,4-Dinitro- Penta- Acena hthene 4-Nitrophenol toluene chlorophenol Pyrene Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 Analyst B Pitamah B Pitamah B Pitamah B Prtamah B Pitamah Concentration Spiked 3,300 yg/kg 3,300 pg/kg 3,300 Ng/kg 3,300 ug/kg 3,300 pg/kg LCS Batch# LCS030598 LCS030598 LCS030598 LCS030598 LC8030598 Date Prepared 03/05/98 03/05/98 03/05/98 03/05/98 03/05/98 Date Analyzed 03/06/98 03/06/98 03/06/98 03/06/98 03/06/98 Instrument I D # F4/1-15 F4/H5 F4/H5 F4/1-15 F4/H5 LCS Recovery 76 ss ss 45 70 Control Limits 31-137% 11-114% 28-89% 17-109% 35142% MS/MSD BS/BSD BS/BSD BS/BSD BS/BSD BS/BSD Batch # 030598 030598 030598 030598 030598 Date Prepared 03/05/98 03/05/98 03/05/98 03/05/98 03/05/98 Date Analyzed 03/06/98 03/06/98 03/06/98 03/06/98 03/06/98 Instrument I D # F4/1-15 F4/1-15 F4/1-15 174/1-15 F4/1-15 Matrix Spike % Recovery 76 86 56 45 70 Matrix Spike Duplicate Recovery 72 62 81 72 78 Relative% 1 Difference 4 5 33 34 45 11 XSEQUA ANALYTIC PleaseNote The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, preparation and apnalytical methods employed for the samples The LCS%recovery data is used for validation of sam le batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only Schn Ider and are not used to accept or reject batch results Manager/Sacramento Laboratory Page 2 of 2 8030071 PES r23>