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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 404 N Wiget Lane Walnut Creek CA 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 1A/Chevron 9-6171 11315 Sunrise Gold Circle, Ste M Matrix Sod Rancho Cordova CA 95742 Attention Tim Anenson QC Sample Group 8010367-0369 Reported Jan 20 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 Daaz L Diaz Concentration Spiked 3 330 f.rg/kg 5 000 ug/kg 3 330 Ng/kg 5,000 pg/kg 3,330 jug/kg LCS Batch# LCS011498B LCS011498B LCS011498B LCS011498B LCS011498B 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 2889 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 01/14/98 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 Matrix Spike % Recovery 86 95 77 100 98 Matrix Spike Duplicate% Recovery 79 95 74 101 91 Relative% Difference 7 6 084 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 validation of sample batch results Due to matrix effects,the QC limits for MS/MSD s are advisory only Linda C Schneider and are not used to accept or refect batch results /, Project Manager/Sacramento Laboratory Page 2 of 2 8010367 PES <15> Z�