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i <br /> r <br /> i <br /> SEQUOIA' ANALYTICAL p City, CA 9 063 <br /> (415) 364-9600 - FAX (415) 364-9233 <br /> IRRESNA Client Project ID W0376 00, Chevron Stockton <br /> 1710 Main Street Matrix Water <br /> Escalon, CA 95320 <br /> ' Attention ,John Lane OC Sample Group 3HD3601,3 Reported Sep 7, 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 /> Cone Spiked. 10 10 io 30 <br /> Units. u9/L u9/L Y9/L pg/L <br /> LCS Batch# BLK090193 BLK090193 BLK090193 BLK090193 <br /> ' Date Prepared- - - <br /> Date Analyzed. 9/1/93 9/1/93 9/1/93 9/1/93 <br /> Instrument i D.# GCHP-3 GCHP-3 GCHP-3 GCHP-3 <br /> LCS% <br /> Recovery 99 98 97 100 <br /> Control Limits- 80.120 80.120 80-120 80-120 <br /> ' MS/MSD <br /> Batch#. 3HE3404 3HE3404 3HE3404 3HE3404 <br /> ' Date Prepared. - - <br /> Date Analyzed: 9/1/93 9/1/93 9/1/93 x/1/93 <br /> Instrument 1 D #• GCHP-3 GCHP-3 GCHP-3 GCHP-3 <br /> Matrix Spike <br /> % Recovery- 99 100 99 100 <br /> ' Matrix Spike <br /> Duplicate % <br /> Recovery 100 100 too 100 <br /> Relative% <br /> Difference 10 00 10 00 <br /> ' SEGU A 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 /> r validation of sample batch results Due to matrix effects the QC limits for MS/MSD's are advisory only <br /> and are not used to accept or reject batch results <br /> ickie Tague <br /> Project Manager 3HD3601 WAT <4> <br />