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• , - , Sequt i 680 Cicsapeake Drive Rcdwood Ciry 94063 (415) 364-9600 FAX(415) 364-9233 <br /> 404,N. Wigcc Lanc Walnut Crcck, CA 94598 (5t0) 988.9600 FAX(510)988.9673 <br /> AnalCarytical 819 Scriker Avenue,Suitc 8 Sacramcnto, Ca 95334 (916) 921-9600 ' FAX{916}921-0100 <br /> Brown&Caldwell .Client Project D. Arco 5453, Stockton <br /> ...'9616 Micron Ave., Suite 600 Matrix: Soil ` <br /> i<`Sacramento, CA 95827 <br /> Attention Steve Misner OC Sample Group 5100252-265 Reported: Oct 19, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Senzene ;Toluene Benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: V.Owens V.Owens V.Owens V.Owens <br /> Concentration <br /> Spiked: 0.20 mg/kg 0.20 mg/kg 0.20 mg/kg 0.60 mg/kg <br /> LCS Batch#: LCS101395 LCS101395 LCS101395 LCS101395 <br /> Date Prepared: 10/13/95 10/13/95 10/13/95 10/13/95 <br /> Date Analyzed: 10/13/95 10/13/95 10/13/95 10/13/95 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % i <br /> Recovery: 96 95 96 95 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch#: 5100555 5100555 5100555 5100555 <br /> �i <br /> Date Prepared: 10/13/95 10/13/95 10/13/95 10/13/95 <br /> Date Analyzed: 10/13/95 10/13/95 10/13/95 10/13/95 } <br /> Instrument l.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 , <br /> Matrix Spike <br /> %Recovery: 85 87 89 92 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 95 96 97 98 <br /> Relative <br /> Difference: 11 9.8 8.6 6.3 <br /> { <br /> SEQUOIA ANALYTICAL Please Note: I� <br /> The LCS is a control sample of known,interferent tree 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 16 matrix effects,the QC limits for MS/MSD's are advisory only <br /> Janet H an and are not used to accept or reject batch results. <br /> Project onager <br /> 5100252.BRS <8> <br />