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SEQUOIA ANALYTICAL <br /> 680 Chesapeake e Redwood Y. CA <br /> 6 (415) 384-9600 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 Garlow CC Sample Group 3E19501 -03 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: A Tran A Tran A.Tran A.Tran <br /> Conc Spiked 20 20 20 60 <br /> Units. pg/L erg/L ug/L Mg/L <br /> LCS Batch#: LCS051293 LCS051293 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-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery: 103 102 102 117 <br />' Control Limits 70-130 70-130 70-130 70-130 <br />' MS/MSD <br /> Batch #' 3ED3301 3ED3301 3ED3W1 3ED3301 <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-2 GCHP-2 GCHP-2 GCHP-2 <br />' Matrix Spike <br /> % Recovery. 100 105 105 103 <br /> Matrix Spike <br />' Duplicate% <br /> Recovery, 105 105 105 115 <br />' Relative % <br /> Difference 49 00 00 is <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 /> � ' 1 f� validation of sample batch results Due to matrix effects,the OC limits for MS/MSD's are advisory only <br /> are not used to accept or reject batch results <br /> Vickie TagU <br /> Project Manager 3E19501 RES <3� <br /> 1 <br />