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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 4D 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 qwr Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 01 Pacific Environmental Group Client Project ID 920-119 1A/Chevron 9-6171 11315 Sunrise Gold Circle Ste M Matrix Soil Rancho Cordova, CA 95742 Attention Tim Anenson QC Sample Group 801-0987 Reported Feb 12, 1998 QUALITY CONTROL DATA REPORT ANALYTE 1 1 Dichloro Chloro ethene Tnchiaroethene Benzene Toluene benzene Method EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 Analyst K Pocan K Pocan K Pocan K Pocan K Pocan Concentration Spiked 2,500 pg/kg 2,500 ug/kg 2,500 deg/kg 2,500 Ng/kg 2,500 ug/kg LCS Batch# LCS021098 LCS021098 LCS021098 LC8021098 LCS021098 Date Prepared 02/10/98 02/10/98 02/10/98 02/10/98 02/10/98 Date Analyzed 02/10/98 02/10/98 02/10/98 02/10/98 02/10/98 Instrument I D # MS-F1 MS-F1 MS F1 MS-171 MS F1 LCS 49 Recovery 109 109 104 105 103 Control Limits 65-135% 70-130% 70-130% 70-130% 70130% MS/MSD Batch # 8010968 8010968 8010968 8010968 8010968 Date Prepared 02/10/96 02/10/98 02/10/98 02/10/98 02/10/98 Date Analyzed 02/10/98 02/10/98 02/10/98 02/10/98 02/10/98 Instrument I D # MS-F1 IVIS-F1 MS-1171 MS-F1 MS F1 Matrix Spike % Recovery 148 142 145 143 Matrix Spike Duplicate % Recovery * 129 129 128 126 Relative % Difference * 14 96 12 13 Please Note The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents SEQUOIA ANALYTIC L 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 and are not used to accept or reject batch results *Matrix Interference 7// inda.CSchneider roject Manager/Sacramento Laboratory 8010987 PES <10> cft