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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br />' (415) 364-9600 FAX (415) 364-9233 <br /> t <br /> RESNA <br /> Client Project ID: W0148.02,Stockton Police <br /> 1710 Main Street Matrix: Water <br /> -.Escalon, CA 95320 <br /> Attention: John Lane QC Sample Group: 3H54001 Reported: Aug 18, 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: M. Nipp M.Nipp M. Nipp M.Nipp <br /> Conc. Spiked: 10 10 10 30 <br /> Units: u9/L u9/L ug/L u9/L <br /> LCS Batch#: BLK061793 BLK081793 BLK081793 BLK081793 <br /> Date Prepared: - - - - <br /> Date Analyzed: 8/17/93 8/17/93 8/17/93 8/17/93 <br /> Instrument I.D.#: GCHP-3 GCHP-3 GCHP-3 GCHP-3 <br /> LCS% <br /> Recovery: 97 89 96 97 <br /> Control Limits: 6D-120 80.120 80-120 80-120 <br /> MS/MSD <br /> Batch#: 31-125112 31-125112 31-125112 31-125112 <br /> Date Prepared: - - - - <br /> Date Analyzed: 8/17/93 8/17/93 8/17/93 8/17/93 <br /> Instrument I.D.#: GCHP-3 GCHP-3 GCHP-3 GCHP-3 <br /> Matrix Spike <br /> % Recovery: 96 89 95 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 95 88 95 93 <br /> Relative% <br /> Difference: 1.0 1.1 0.0 4.2 <br /> SEQUOIA ANALYTICAL 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 OC limits for MS/MSD's are advisory only <br /> and are not used to accept or reject batch results. <br /> Vickie Tague <br /> Project Manager 31-154001MAT <2> <br />