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(D Sequoia <br />10680 Chesapeake Drive <br />Redwood City, CA 9406(415) 364-9600 <br />FAX (415) 364-9233 <br />1QF Analytical <br />404 N. Wiget Lane <br />819 Striker Avenue, Suite 8 <br />Walnut Creek, CA 94598 (510) 988-9600 <br />Sacramento, CA 95834 (916) 921-9600 <br />FAX (510) 988-9673 <br />FAX (916) 921-0100 <br />3164 Gold Camp Dr., Suite 200 Matrix: Soil <br />Rancho Cordova, CA 95670 <br />Attention: Eric Holm QC Sample Group 507-1403 Reported: Aug 10, 1 <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: <br />EPA 8270 <br />EPA 8270 <br />EPA 8270 <br />EPA 8270 <br />EPA 8270 <br />EPA 8270 <br />Analyst: <br />E. Manuel <br />E. Manuel <br />E. Manuel <br />E. Manuel <br />E. Manuel <br />E. Manuel <br />Concentration <br />Spiked: <br />100 ug/L <br />100 ug/L <br />100 ug/L <br />100 ug/L <br />100 ug/L <br />100 ug/L <br />LCS Batch#: <br />LCS072795 <br />LCS072795 <br />LCS072795 <br />LCS072795 <br />LCS072795 <br />LCS072795 <br />Date Prepared: <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />Date Analyzed: <br />8/2/95 <br />8/2/95 <br />8/2/95 <br />8/2/95 <br />8/2/95 <br />8/2/95 <br />Instrument I.D.#: <br />F4 <br />F4 <br />F4 <br />F4 <br />F4 <br />F4 <br />LCS % <br />Recovery: <br />83 <br />82 <br />77 <br />81 <br />85 <br />82 <br />Control Limits: <br />5-112 <br />23-134 <br />20-124 <br />RL -230 <br />44-142 <br />22-147 <br />MS/MSD <br />Batch #: <br />9507F89-04 <br />9507F89-04 <br />9507F89-04 <br />9507F89-04 <br />95071789-04 <br />9507F89-04 <br />Date Prepared: <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />Date Analyzed: <br />8/2/95 <br />8/2/95 <br />8/2/95 <br />8/2/95 <br />8/2/95 <br />8/2/95 <br />Instrument I.D.#: <br />F4 <br />F4 <br />F4 <br />F4 <br />F4 <br />F4 <br />Matrix Spike <br />% Recovery: <br />86 <br />87 <br />80 <br />87 <br />86 <br />85 <br />Matrix Spike <br />Duplicate % <br />Recovery: <br />83 <br />81 <br />76 <br />81 <br />83 <br />82 <br />Relative % <br />Difference: <br />3.6 <br />7.1 <br />5.1 <br />7.1 <br />3.6 <br />3.6 <br />SEQUOIA ANALYTICAL <br />Linda C. Schneider <br />Project Manager <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 />Page 1 of 2 <br />5071403.DLT <8> <br />