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� Mr •r <br /> SEQUOIA ANALYTICAL <br /> . 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> RESNA r n 'r rvllent Project ID W0402 00,rHoltrosSBr t� tockton' h <br /> v <br /> 1710 Main Street Matra Water <br /> Escalon, CA 95320 <br /> ,Attention John Lane OC Sample Group 31347801-05 hr h v Reported Mar 23, 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. A.Miraftab A. Miraftab A.Miraftab A.Miraftab <br /> Cone. Spiked: 10 10 10 30 <br /> Units: ug/L ug/L ug/L ug/L <br /> LCS Batch#: GBLK031493 GBLKW1493 GBLK031493 (3BLK031493 <br /> Date Prepared: - - - <br /> Date Analyzed 3/14/93 3/14/93 3/14/93 3/14/93 <br /> instrument 1.0#: GCHP�3 GCHP-3 GCHP-3 GCHP-3 <br /> LCS % <br /> Recovery: 98 95 95 97 <br /> Control Limits- 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch#: 930339702 930339702 930339702 930339702 <br /> Date Prepared, - - - <br /> Date Analyzed 3/14/93 3/14/93 3/14/93 3/14/93 <br /> Instrument I D #: GCHP-3 GCHP-3 GCHP-3 GCHP-3 <br /> Matrix Spike <br /> %Recovery: 99 98 97 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 98 98 97 97 <br /> Relative% <br /> Difference: 10 00 00 00 <br /> VEQUOIA 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 refect batch results <br /> Mari e <br /> Proj ger, r * y 3C47801 WAT <8> <br />