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Sequoia <br />Analytical <br />Roy r Weston <br />2300 Clayton Rd , Suite 1580 <br />Concord, CA 94520-2148 <br />' Attention Scott Emerson -Price <br />' ANALYTE <br />Benzene <br />Method EPA 8020 <br />Analyst B Williams <br />Concentration <br />' Spiked 10 ug/L <br />LCS Batch# LCS121395 <br />Date Prepared 12/13/95 <br />Date Analyzed 12/13/95 <br />Instrument I D # GCHP-2 <br />LCS % <br />Recovery 94 <br />' Control Limits 75-125 <br />MS/MSD <br />Batch # BS121395 <br />' Date Prepared 12/13/95 <br />Date Analyzed 12/13/95 <br />Instrument I D # GCHP-2 <br />' Matrix Spike <br />% Recovery 97 <br />' Matrix Spike <br />Duplicate % <br />Recovery 95 <br />' Relative % <br />Difference 21 <br />SEQUOIA ANALYTICAL <br />,�%l�C�� d`'iZGt�Gr <br />Linda C Schneider <br />Project Manager <br />680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br />404 N W1get Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br />819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 911 9600 FAX (916) 921 0100 <br />Client Project ID SJCMUCD <br />Matrix Water <br />OC Sample Group 5120314-17 Reported Dec 17, 1995 <br />QUALITY CONTROL DATA REPORT <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 1s used for <br />validation of sample batch results Due to matrix effects, the QC limits for MS/MS❑ s are advisory only <br />and are not used to accept or reject batch results <br />5120314 ROY 4 3 > <br />A - <br />Ethyl - <br />Toluene <br />Benzene <br />xylenes <br />Diesel <br />EPA 8020 <br />EPA 8020 <br />EPA 8020 <br />EPA 8015M <br />B Williams <br />B Williams <br />B Williams <br />C Lee <br />10 ug/L <br />10 ug/L <br />30 ug/L <br />300 ug/L <br />LCS121395 <br />LCS121395 <br />LCS121395 <br />LCS120795 <br />12/13/95 <br />12/13/95 <br />12/13/95 <br />12/7/95 <br />12/13/95 <br />12/13/95 <br />12/13/95 <br />12/7/95 <br />GCHP 2 <br />GCHP-2 <br />GCHP-2 <br />GCHP-3B <br />100 <br />100 <br />100 <br />90 <br />75-125 <br />75-125 <br />75-125 <br />60-130 <br />SS121395 <br />13S121395 <br />BS121395 <br />BS120695 <br />12/13/95 <br />12/13/95 <br />12/13/95 <br />12/6/95 <br />12/13/95 <br />12/13/95 <br />12/13/95 <br />12/6/95 <br />GCHP-2 <br />GCHP-2 <br />GCHP-2 <br />GCHP-38 <br />95 <br />98 <br />97 <br />92 <br />96 <br />98 <br />93 <br />89 <br />10 <br />00 <br />42 <br />33 <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 1s used for <br />validation of sample batch results Due to matrix effects, the QC limits for MS/MS❑ s are advisory only <br />and are not used to accept or reject batch results <br />5120314 ROY 4 3 > <br />A - <br />