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Sequoia 680 C"Csapeake Drive Redwood City CA 9406-1 (650) 364-9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(9Z5)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br />' <br /> Pacific i5nvironmental Group Client Project ID Unocal 0123, Tracy, CA <br /> 11315 Sunrise Gold Circle, Ste M Matrix Sod <br /> Rancho Cordova, CA 95742 <br />' Attention Mike Mitchener QC Sample Group 5810079 Reported Oct 20, 1998 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE 14-Dichioro- N-Nitroso-Di- 1,2,4-Trichloro- 4-Chloro-3- <br /> Phenol 2-Chlorophenol benzene N-propylamine benzene Meth 1phen 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 uglkg 5,000 ug/kg 3 300 ug/kg 3,300 Mg/kg 3,300 uglkg 5,000 ug/kg <br /> LCS Batch# BLK100896A BLK100898A BLK100898A BLK100898A BLK100898A BLK100898A <br /> Date Prepared 10/08/98 10/08/98 10/08/98 10/08/98 10/08/98 10/08/98 <br />' Date Analyzed- 10/12/98 10/12/98 10/12/98 10/12/98 10/12/98 10/12/98 <br /> Instrument I D# GUMS 1 GCIMS 1 GUMS 1 GUMS 1 GUMS 1 GC/MS 1 <br /> LCS.% <br /> Recovery 64 64 73 85 85 86 <br /> Control Limits 26-90% 25-102% 28-104% 41-126% 38-107% 26-103% <br /> ry x 1 <br /> MS/MSD <br /> ' Batch 0 8100177 8100177 8100177 8100177 8100177 8100177 <br /> Date Prepared 10/02/98 10/02/98 10/02/98 10/02/98 10/02198 10/02/98 <br /> Date Analyzed: 10/02/98 10/02/98 10/02/98 10/02/98 10/02/98 10/02/98 <br /> ' Instrument I D# GC/MS 1 GUMS 1 GUMS 1 GUMS 1 GCrnnS 1 GC/MS 1 <br /> Matrix Spike <br /> % Recovery 62 66 61 79 73 74 <br /> ' Matrix Spike <br /> Duplicate % <br /> Recovery 68 76 70 88 85 84 <br /> 1 Relative % <br /> Difference 92 14 14 11 15 13 <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> YL <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> and are not used to accept or re ect batch results <br /> a C Schneider <br /> ect Manager/Sacramento Laboratory Page 1 of 2 <br /> ' S810079 PES e8> <br />