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SEQUOIA ANALYTICAL <br /> 680 Chesapeaker� <br /> Drive Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> RESNA Client Project ID W014802, Stockton Police <br /> 1710 Main Street Matrix Water <br /> Escalon, CA 95320 <br /> Attention John Lane OC 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 6020 <br /> Analyst M Nipp M Nipp M Nipp M Nipp <br /> Cont: Spiked- 10 10 10 30 <br /> Units Fr9/L pg/L Ng/L u9/L <br /> LCS Batch# BLK081793 BLK081793 BLK081793 BLK081793 <br /> Date Prepared - - - - <br /> Date Analyzed 8/17/93 8/17/93 8/17/93 8/17/93 <br /> 0Instrument 1 D # GCHP-3 GCHP-3 GCHP 3 GCHP-3 <br /> LCS % <br /> Recovery 97 89 96 97 <br /> Control Limits 80-120 80-120 60-120 80.120 <br /> MS/MSD <br /> Batch# 31-125112 3H25112 31-125112 3H25112 <br /> Date Prepared - - - - <br /> Date Analyzed 8/17/93 8/17/93 8/17/93 8/17/93 <br /> Instrument LD # 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 68 95 93 <br /> Relative% <br /> Difference 1 0 1 1 00 42 <br /> SEQUOIA <br /> 2 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matftx 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 hatch results Due to matrix effects,the QC limits for MS/MS0's are advisory only <br /> and are not used to accept or reject batch results <br /> Vlckle Tague <br /> Project Manager 3H54001 WAT <2> <br />