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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Redwood y. CA <br /> 6 (415) 364-9600 FAX (415) 364 9233 <br /> RESNA Client Project ID F7120 93, Quick Stop Stockton <br /> 3315 Almaden Expwy ,, Suite 34 Matrix Water <br /> San Jose, CA 95118 <br /> Attention Rich Gadow OC Sample Group 3E19502 Reported May 16, 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. J Fontecha J Fontecha J Fontecha J Fontecha <br /> Conc Spiked* 20 20 20 60 <br /> Units. us/L Yg/L ug/L wg/L <br /> LCS Batch#. LCS051M LCS0512W LCS051293 LCS051293 <br /> Date Prepared. 5/12/93 5/12/93 5/12/93 5/12/93 <br /> Date Analyzed. 5/12/93 5/12/93 5/12/93 5/12/93 <br />,,Instrument I D #. GCHP-5 GCHP-5 GCHP-5 GCHP-5 <br /> LCS % <br /> Recovery- 114 111 108 112 <br />' Control Limrts• 70-130 70-130 70-130 70-130 <br />' MS/MSD <br /> Batch # 3ED3501 3ED3501 3ED3501 3>=D3501 <br />' Date Prepared 5/12/93 5/12/93 5/12/93 5/12/93 <br /> Date Analyzed. 5/12/93 5/12/93 5/12/93 5/12/93 <br /> Instrument I D #: GCHP-5 GCHP-5 GCHP 5 GCHP-5 <br /> Matrix Spike <br /> % Recovery: 115 110 110 113 <br />' Matrix Spike <br /> Duplicate% <br /> Recovery 115 110 110 117 <br />' Relative% <br /> Difference' 00 00 00 35 <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 QC limits for MS/MSD's are advisory only <br />' and are not used to accept or reject batch results <br /> Vickie Ta a 3E19501 RES <4> <br /> Project Manager <br /> 1 <br />