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ID Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 404 N Wiget Lane Walnut Creek CA 94598 (S 10) 988 9600 FAX(510)988 9673 trills Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 Pacific Environmental Group Client Project ID 920-119 1A/Chevron 9-6171, Stockton, CA 11315 Sunrise Gold Circle, Ste M Matrix Soil Rancho Cordova, CA 95742 Attention Tim Anenson QC Sample Grou 8010310-0314 Reported Jan 26, 1998 QUALITY CONTROL DATA REPORT ANALYTE 2 4 Dinitro Penta Acenaphthene 4-Nitrophenol 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 Vg/kg 5,000/tg/kg 3,330 pg/kg 5 000{ug/kg 3,330 ug/kg LCS Batch# BLK011498 BLK011498 BLK011496 BLK011498 BLK011498 Date Prepared 01/14/98 01/14/98 01/14/98 01/14/98 01/14/98 Date Analyzed 01/15/98 01/15/98 01/15/98 01/15/98 01/15/98 Instrument I D # GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 LCS Recovery 78 73 76 87 84 Control Limits 31-137 11-114 28-89 17-109 35-142 MS/MSD Batch # 8010593 8010593 8010593 8010593 8010593 Date Prepared 01/14/98 01/14/98 01/14/98 01/14/98 01/14/98 Date Analyzed 01/15/98 01/15/98 01/15/98 01/15/98 01/15/98 Instrument I D # GC/M5 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 Matrix Spike % Recovery 86 95 77 100 98 Matrix Spike Duplicate % Recovery 79 96 74 101 91 Relative Difference 76 084 32 020 73 SEQUOIA ANALYTICAL Please Note The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, preparation and analytical methods employed for the samples The LCS%recovery data is used for 7GCC.( validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only inda C Schneider and are not used to accept or re)ect batch results Project Manager/Sacramento Labors ory Page 2 of 2 8010310 PES -29