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Sequoia 680 Chesapeake Qnve Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Iwo 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 Stockton, CA <br /> 11315 Sunrise Gold Circle, Ste M Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson QC Sample Grou 8010310-0314 Reported ,tan 26, 1998 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,4-Dichloro- N-Nitroso-Di- 1,2,4-Trichloro- 4-Chloro-3 <br /> Phenol 2-Chlorophenol benzene N-propylamine 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 pg/kg 5,000 ug/kg 3,330 ug/kg 3 330 ug/kg 3,330 ug/kg 5 000 ug/kg <br /> LCS Batch# BLK011498 BLK011498 BLK011498 BLK011498 BLK011498 BLK011498 <br /> Date Prepared 01/14/98 01/14/98 01/14/98 01/14/98 01/14/98 01/14/98 <br /> Date Analyzed 01/15/98 01/15/98 01/15/98 01/15/98 01/15/98 01/15/98 <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 /> IDRecovery 68 75 71 77 77 77 <br /> Control Limits 26 90 25 102 28 104 41-126 38-107 26-103 <br /> MS/MSD <br /> Batch # 8010593 8010593 8010593 8010593 8010593 8010593 <br /> Date Prepared 01/14/98 01/14/98 01/14/98 01/14/98 01/14/98 01/14/98 <br /> Date Analyzed 01/15/98 01/15/98 01/15/98 01/15/98 01/15/98 01/15/98 <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 74 74 85 76 83 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 67 74 73 87 76 81 <br /> Relative % <br /> Difference 1 2 027 082 31 040 1 7 <br /> Please Note <br /> A&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 /> /!" �„�(`�� validation of sample batch results Due to matrix effects,the OC limits for MS/MSDs are advisory only <br /> %( CCC C and are not used to accept or reject batch results <br /> Inda C Schn ider <br /> Project Manager/Sacramento Laboratory Page 1 of 2 <br /> 8010310 PES <26> <br />