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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 4D 404 N Wiget Lane Walnut Creek CA 94598 (5 10) 988 9600 FAX (510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Pacific Environmental GroupClient Project Ib 920-119 to Chevron 9-6171 <br /> 1 IA/ <br /> Chevron <br /> Sunrise Gold Circle, Ste M Matrix Soil <br /> Rancho Cordova CA 95742 <br /> Attention Tim Anenson QC Sample Group 8010367-0369 Reported Jan 20, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 11-Dichloro- Chloro- <br /> ethene Trichloroethene Benzene Toluene benzene Diesel <br /> Method EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 DHS LUFT <br /> Analyst K Pocan K Pocan K Pocan K Pocan K Pocan C Lee <br /> Concentration <br /> Spiked 2 500 ug/kg 2 500 ug/kg 2 500 ug/kg 2,500 ug/kg 2 500 ug/kg 12 5 mg/kg <br /> LCS Batch# LCS011697 LCS011697 LCS011697 LCS011697 LCS011697 LCS011597 <br /> Date Prepared 01/16/98 01/16/98 01/16/98 01/16/98 01/16/98 01/15/98 <br /> Date Analyzed 01/16/98 01/16/98 01/16/98 01/16/98 01/16/98 01/15/98 <br /> Instrument I D # MS-F1 MS-F1 MS 171 MS-F1 MS-171 GCHP-38 <br /> LCS % <br /> Recovery NA* 98 99 96 93 93 <br /> Control Limits 65-135 70 130 70-130 70-130 70130 60-140 <br /> MS/MSD <br /> Batch# BS011698 BS011698 BS011698 SS011698 BS011698 8010314 <br /> Date Prepared 01/16/98 01/16/98 01/16/98 01/16/98 01/16/98 01/15/98 <br /> Date Analyzed 01/16/98 01/16/98 01/16/98 01/16/98 01/16/98 01/19/98 <br /> Instrument I D # MS F1 MS-F1 MS-171 MS F1 MS-F1 GCHP-313 <br /> Matrix Spike <br /> % Recovery NA* 98 99 96 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery NA* 78 81 107 86 <br /> Relative% <br /> Difference NA* 23 21 11 7 8 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQ QIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limns for MS/MSDs are advisory only <br /> and are not used to accept or reject batch results *Matrix Interference <br /> 7 NA* Percent recovery unavailable due to computer error <br /> Xinda C Schneider <br /> Protect Manager/Sacramento Laboratory <br /> 8010367 PES <13> <br />