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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> 0egis Environmental Consultants` Client Project iD:" Ulfrarr�af#6961 Lodi <br /> 050 Melody Lane, Ste. 160 Matrix. Water <br /> Roseville, CA 95678 <br /> Attention Sheila Richgels QC Sample Group: 3100512-516 Reported: Oct 19, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene benzene xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: Chiaravaiioti Chiaravalloti Chiaravalloti Chiaravaiicti <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#: LCS101893 LCS101893 LCS101893 LCS101893 <br /> Date Prepared: 10/18/93 10/18/93 10/18/93 10/18/93 <br /> Date Analyzed: 10/18/93 10/18/93 10/18/93 10/18/93 <br /> Instrument I.D.#: HP2 HP2 HP2 HP2 <br /> LCS % <br /> recovery: 91 90 92 93 <br /> Controi Limns: 80.120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch #: 3100573 3100573 3100573 3100573 <br /> Date Prepared: 10/18/93 10/18/93 10/18/93 10/18/93 <br /> Date Analyzed: 10/18/93 10/18/93 10/18/93 10/18/93 <br /> Instrument I.D.#: HP2 HP2 HP2 HP2 <br /> Matrix Spike <br /> % Recovery: 37 95 95 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 110 100 100 103 <br /> Relative% <br /> Difference: 13 5.1 5.1 10 <br /> Please Mote: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples. The LCS%recovery data is used for <br /> validation of sample batch results. Cue to matrix effects,the QC limits tar MS/MSD's are advisory only <br /> and are not used to accept or refect batcn results. <br /> Linda C. Schneider <br /> Project Manager 3100512-AEG <2> <br />