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Sequoia 680 C"`sapeake Drive Redwood City CA 9406a (650)364-9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Strike,Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br />' Pacific E5nvironmental Group Client Project ID Unocal 0123, Tracy, CA <br /> 11315 Sunrise Gold Circle, Ste M Matrix Soil <br /> Rancho Cordova, CA 95742 <br />' Attention Mike Mitchener QC Sample Group S810079 Reported Oct 20, 1998 - <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTEi,1-Dichloro- Chloro- <br />' ethene Trichloroethene Benzene Toluene benzene <br /> Method EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 <br />' Analyst N Nelson N Nelson N Nelson N Nelson N Nelson <br /> Concentration <br /> Spiked 2 500 pg/kg 2,500 pg/kg 2,500 pg/kg 2,500 pg/kg 2,500 pg/kg <br />' LCS Batch#: LCS 10/19/98 LCS 10/19/98 LCS 10/19/98 LCS 10/19/98 LCS 10/19/98 <br /> Date Prepared 10/19/98 10/19/98 10/19/98 10/19/98 10/19/98 <br /> ' Date Analyzed 10/19/98 10/19/98 10/19/98 10/19/98 10/19/98 <br /> Instrument I D.# GC/MS-2 GUMS-2 GC/MS-2 GUMS-2 GC/MS-2 <br /> LCS % <br /> Recovery 100 96 96 96 92 <br /> Control Limits 65-135 70-130 70-130 70-130 70-130 <br /> ' MSIMSD <br /> Batch # 8100646 8100646 8100646 8100646 8100646 <br /> Date Prepared 10/19/98 10/19/98 10/19/98 10/19/98 10/19/98 <br /> Date Analyzed 10/19/98 10/19/98 10/19/98 10/19/98 10/19/98 <br /> ' Instrument I D # GUMS-2 GC/MS-2 GCIMS-2 GCIMS-2 GUMS-2 <br /> Matrix Spike <br /> % Recovery 104 100 100 100 100 <br /> ' Matrix Spike <br /> Duplicate% <br /> Recovery- 96 92 92 92 92 <br /> Relative% <br /> Difference: 80 8 3 8 3 8 3 8 3 <br /> ease Note <br /> The LCS is a control sample of known,Interferent free matrix that is analyzed using the same reagents <br /> SEQ OIA 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 limits for MS/MSO's are advisory only <br /> and are not used to accept or reject batch results <br /> inda C Schneider <br /> Project Manager/Sacramento Laboratory <br /> 5810079 PES 47> <br />