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Sequoia <br />Analytical <br />680 Chesapeake Drive Redwood Cit) CA 94063 (415) 364 9600 FAX (415) 364 9233 <br />IQO(1 Bates A%rnue Suite L Concord CA 94520 51M 686 9600 FAX 510 686 9489 <br />819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br />Groundwater Technology Client Project ID Chevron 9-2033, Stockton, CA <br />1401 Halyard Drive, Suite 140 Matrix Soil <br />West Sacramento, CA 95691 <br />Attention Jason Fedota QC Sample Group 5031074-1077 Reported Mar 23, 1995 <br />MS/MSD <br />Batch #. 5030458 <br />Date Prepared 3/15/95 <br />Date Analyzed <br />Oil & Grease, <br />Method <br />SM 5520 EF <br />Analyst: <br />L. Bettencourt <br />Concentration <br />80 <br />Spiked: <br />500 mg/kg <br />LCS Batch#: <br />LCS032295 <br />Date Prepared: <br />3/22/95 <br />Date Analyzed <br />3/23/95 <br />Instrument I.D.#: <br />SAL 4 <br />LCS % <br />Recovery, <br />so <br />Control Limits. <br />75-125 <br />MS/MSD <br />Batch #. 5030458 <br />Date Prepared 3/15/95 <br />Date Analyzed <br />3/15/95 <br />Instrument I D.# <br />BAL. 4 <br />Matrix Spike <br />% Recovery: <br />80 <br />Matrix Spike <br />Duplicate % <br />Recovery <br />80 <br />Relative % <br />Difference, <br />00 <br />SEQUOIA ANALYTI AL <br />Linda C Schneider <br />Project Manager <br />QUALITY CONTROL DATA REPORT <br />.. v +. r v , v •'.v v i, t 1 �, +.n } } � .♦ ave \ i.. n�e� <br />Please Note <br />The LCS is a control sample of known, interferent tree 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/MSD s are advisory only <br />and are not used to accept or reject batch results <br />lM <br />5031074 GRW <2> <br />