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to a_ � <br /> Sequoia b80 Chesapeake Drive Redwood Gtv CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord,CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Brown &Caldwell Client Project ID Arco 1321, Modesto <br /> 9616 Micron Ave, Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Mindy Patterson OC Sample Goup 5030259-260 Reported Mar 20, 1995 <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- C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS031395 LCS031395 LCS031395 LCS031395 <br /> Date Prepared: 3/13/95 3/13/95 3/13/95 3/13/95 <br /> Date Analyzed 3/13/95 3/13/95 3/13/95 3/13/95 <br /> Instrument LD # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> . LCS % <br /> Recovery 98 98 97 97 <br /> Control Limas: 75-125 75-125 75.125 75-125 <br /> MS/MSD <br /> Batch#- 5030259 5030259 5030259 5030259 <br /> Date Prepared. 3/13/95 3/13/95 3/13/95 3/13/95 <br /> Date Analyzed. 3/13/95 3/13/95 3/13/95 3/13/95 <br /> Instrument I D.#' GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 97 96 96 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 98 96 98 100 <br /> Relative% <br /> Difference: 10 00 20 30 <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 /> _ I 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 GC limits for MS/MSG's are advisory only <br /> Jennie Higgins and are not used to accept or reject batch results <br /> Project Manager <br /> 5030259 BRS <2> <br />