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Sequoia 680 Chesapeake Drive Redwood Ctty CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 4IN 404 N Wtget Lane Walnut Creek CA 94598 (510) 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 Group Client Project ID 920-119 1A/Chevron 9-6171 <br /> 11315 Sunrise Gold Circle, Ste M Matrix Sod <br /> Rancho Cordova CA 95742 <br /> Attention Tim Anenson QC Sample Group 801-0987 Reported Feb 12 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,4 Dichloro N-Nitroso D1 1,2,4-Trichloro- 4-Chloro 3 <br /> Phenol 2 Chlorophenol benzene N propylamme benzene Meth i hen I <br /> Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Analyst L Diaz L Diaz L Diaz L Diaz L Diaz L Diaz <br /> Concentration <br /> Spiked 5 000,ug/kg 5 000 erg/kg 3,330 ug/kg 3,330,ug/kg 3 330 pg/kg 5 000 ug/kg <br /> LCS Batch# BLK020398 BLK020398 BLK020398 BLK020398 BLK020398 BLK020398 <br /> Date Prepared 02/03/98 02/03/98 02/03/98 02/03/98 02/03/98 02/03/98 <br /> Date Analyzed 02/04/98 02/04/98 02/04/98 02/04/98 02/04/98 02/04/98 <br /> Instrument I D # GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 <br /> LCS <br /> Is Recovery 68 73 70 79 77 77 <br /> Control Limits 2690% 25 102% 28 104% 41-126% 38107% 26 103% <br /> MS/MSD <br /> Batch# BLK020398 BLK020398 BLK020398 BLK020398 BLK020398 BLK020398 <br /> Date Prepared 02/03/98 02/03/98 02/03/98 02/03/98 02/03/98 02/03/98 <br /> Date Analyzed 02/04/98 02/04/98 02/04/98 02/04/98 02/04/98 02/04/98 <br /> Instrument I D # GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 <br /> Matrix Spike <br /> % Recovery 68 73 70 79 77 77 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 66 70 68 82 76 81 <br /> Relative% <br /> Difference 36 39 22 37 16 48 <br /> Please Note <br /> 7PIrEQUSIA ANALYTIC L The LCS is a control sample of known interferent tree matrix that is analyzed using the same reagents <br /> preparation and analytical methods employed for the samples The LGS%recovery data is used for <br /> � ��� '4� validation of sample batch results Due to matrix effects the QC limits for MS/MSDs are advisory only <br /> and are not used to acce t or re ect batch results <br /> nda C Schneider <br /> oject Manager/Sacramento Laboratory Page 1 of 2 <br /> 8010987 PES <11> <br />