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0Sequoia 680 Chesapeake Dnve Redwood Cry CA 94063 (415) 364 96W FAX(415) 364 9233 <br /> 4D404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 96734 <br /> Analytical 319 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Brown & Caldwell Client Project 10 Arco 2133-95-5, Stockton <br /> 9616 Micron Ave , Suite 600 Matrix Air/Water <br /> Sacramento, CA 95827 <br /> Attention Mindy Patterson OC Sample Group 5081046-1048 Reported Sep 6, 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 C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 u9/L 30 ug/L <br /> LCS Batch L C;306::895 LLZ052F-3 ` 'SSCB_'535 LCS082395 <br /> Date Prepared 8/28/95 8/28/95 8/28/95 8/28/95 <br /> Date Analyzed 8/28/95 8/28/95 8/28/95 8/28/95 <br /> Instrument I D # GCHP-2 GCHP 2 GCHP 2 GCHP-2 <br /> . LCS % <br /> Recovery 87 89 90 91 <br /> Control Limrts 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# 5081025 5081025 5081025 5081025 <br /> Date Prepared 8/28/95 8/28/95 8/28/95 8/28/95 <br /> Date Analyzed- 8/28/95 8/28/95 8/28/95 8/28/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery. 87 89 88 88 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 87 89 89 89 <br /> Relative% <br /> Difference 0 0 00 1 1 1 1 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS Is 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 is used for <br /> e/( validation of sample batch results Due to matrix effects,the CC limits for MS/MSD s are advisory only <br /> Janet H an and are not used to accept or reject batch results <br /> Protect Hager <br /> 5081046 BRS <6 n <br />