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Sequoia 680 Chesapeake Drive Redwood City, CA 94 (415) 364-9600 FAX (415) 364-9233 <br />ID `� 404 N. Wiaet Lane Walnut Creek, CA 9459 (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 /><::>>:.........................:::.`« <br />_:::>:::<:::>:::<:>::::>:..............I.......... ........... <br />ies Inc. CProject ID UNOCAL":ToscOBP: <br />3164 Gold Camp Dr., Suite 240 Matrix: Soil <br />Rancho Cordova, CA 95670 <br />Attention: Greg Gurss QC Sample Group 7050335-0336 Reported: May 21, 199, <br />...................................................................................................................................................................................................................................................................................... . <br />....................................................................................................................................................................................................................................................................................... . <br />....................................................................................................................................................................................................................................................................................... <br />........................................................................................................................................................................................................................................................................................ <br />....................................................................................................................................................................................................................................................................................... <br />ANALYTE 1,4-Dichloro- N -Nitroso -Di- 1,2,4-Trichloro- 4 -Chloro -3 - <br />Phenol 2 -Chlorophenol benzene N-proeylamine benzene Meth I hen I <br />Method: <br />EPA 8270 <br />EPA 8270 <br />EPA 8270 <br />EPA 8270 <br />EPA 8270 <br />EPA 8270 <br />Analyst: <br />I. Dalvand <br />I. Dalvand <br />I. Dalvand <br />I. Dalvand <br />I. Dalvand <br />I. Dalvand <br />Concentration <br />Spiked: <br />5000 ug/kg <br />5000 ug/kg <br />2500 ug/kg <br />2500 ug/kg <br />2500 ug/kg <br />5000 ug/kg <br />LCS Batch#: <br />LCS051997 <br />LCS051997 <br />LCS051997 <br />LCS051997 <br />LCS051997 <br />LCS051997 <br />Date Prepared: <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />Date Analyzed: <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />Instrument I.D.#: <br />GC/MS-1 <br />GC/MS-1 <br />GC/MS-1 <br />GC/MS-1 <br />GC/MS-1 <br />GC/MS-1 <br />LCS % <br />Recovery: <br />104 <br />96 <br />92 <br />92 <br />92 <br />94 <br />Control Limits: <br />26-90 <br />25-102 <br />28-104 <br />41-126 <br />38-107 <br />26-103 <br />MS/MSD <br />Batch #: <br />7050421 <br />7050421 <br />7050421 <br />7050421 <br />7050421 <br />7050421 <br />Date Prepared: <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />Date Analyzed: <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />Instrument I.D.#: <br />GC/MS-1 <br />GC/MS-1 <br />GC/MS-1 <br />GC/MS-1 <br />GC/MS-1 <br />GC/MS-1 <br />Matrix Spike <br />% Recovery: <br />88 <br />94 <br />88 <br />72 <br />88 <br />88 <br />Matrix Spike <br />Duplicate % <br />Recovery: <br />90 <br />100 <br />92 <br />76 <br />92 <br />96 <br />Relative % <br />Difference: <br />2.2 <br />6.2 <br />4.4 <br />5.4 <br />4.4 <br />8.7 <br />SEQUOIA ANALYTICAL <br />eD44A M • 0&)C. A40 <br />Please Note: <br />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 QC limits for MS/MSD's are advisory only <br />and are not used to accept or reject batch results. <br />Edana M. Fruclano <br />Project Manager/Sacramento Laboratory <br />Page 1 of 2 <br />7050335.GSI <17> <br />