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Sequoia 680 Chesapeake Cnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94593 (510) 983 9600 F4X(510)988 9673 <br /> Analytical 3195tnkerAvenue Suite A Sacramento Ca 95834 (916) 921 9,500 FAX(916)92t 0100 <br /> . Brown & Caldwell Client Project ID Arco 02133, Stockton CA <br /> 9616 Micron Ave , Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Steve Misner CC Sample Group 7030653-72 Reported Apr 1 1997 <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 B w B w B w B w <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS032797 I-CS032797 LCS032797 LCS032797 <br /> Date Prepared 03/27/97 03/27/97 03/27/97 03/27/97 <br /> Date Analyzed 03/27/97 03/27/97 03/27/97 03/27/97 <br /> Instrument I D # GCHP 2 GCHP 2 GCHP 2 GCHP 2 <br /> LCS <br /> Recovery se sa sz 92 <br /> Control Limits 70-130 70-130 70 130 70 130 <br /> MS/MSD <br /> Batch # 7030830 7030830 7030830 7030830 <br /> Date Prepared 03/27/97 03/27/97 03/27/97 03/27/97 <br /> Date Analyzed 03/27/97 03/27/97 03/27/97 03/27/97 <br /> Instrument I D # GCHP 2 GCHP 2 GCHP 2 GCHP 2 <br /> Matrix Spike <br /> % Recovery 90 90 93 94 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 88 90 93 92 <br /> Relative % <br /> Difference 22 0 0 00 22 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS 1s a control sample of known interferent free matrix that 1s analyzed using the same reagents <br /> preparation and analytical methods employed for the samples The LCS%recovery data 1s used far <br /> validation of sampie batch results Due to matrix effects,the QC limits for{VIS/MSD s are advisory only <br /> Edana M Fruciano and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labora ory 7030653 BRS <9> <br />