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l <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> 1900 Bates Avenue butte L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 1916) 921 9600 FAX(9145)921 0100 <br /> Brown &Caldwell Client Project ID Arco 2133 Stockton <br /> 9616 Micron Ave , Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Mindy Patterson OC Sample Goup 503-0457 Reported Mar 22, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes TRPH Lead <br /> Method: EPA 6020 EPA 8020 EPA 8020 EPA 8020 EPA 418 1 EPA 200 7 <br /> Analyst- C Lee C Lee C Lee C Lee V Owens K Balla <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L 4 0 mg/L 0 50 mg/L <br /> LCS Batch#-. LCS031395 LCS031395 LCS031395 LCS031395 LCS032295 LCS031095 <br /> Date Prepared: 3/13/95 3/13/95 3/13/95 3/13/95 3/22/95 3/10/95 <br /> Date Analyzed: 3/13/95 3/13/95 3/13/95 3/13/95 3/22/95 3/17/95 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 IR-1 P-40 <br /> LCS % <br /> Recovery: 98 98 97 97 88 100 <br /> Control Limas: 75-175 75-125 75-125 75-125 80-120 80-120 <br /> MS/MSD <br /> Batch# 5030259 5030259 5030259 5030259 81-1(032095 5030556 <br /> Date Prepared: 3/13/95 3/13/95 3/13/95 3/13/95 3/20/95 3/14/95 <br /> Date Analyzed: 3/13/95 3/13/95 3/13/95 3/13/95 3/20/95 3/17/95 <br /> Instrument I.O.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 IR-1 P-40 <br /> Mat u Spike <br /> % Recovery: 97 96 96 97 92 105 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 98 96 98 100 92 108 <br /> Relative% <br /> Difference: 10 00 20 3 0 00 2 8 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a oontrol sample of known,interferent free matrix that Is analyzed using the same reagents, <br /> ,rw..a� preparation and analytical methods employed for the samples The LCS%recovery daft is used for <br /> "''iiVVCC validation of sample batch results Due to matrix effects,the QC limits for MS/MSQs are advisory only <br /> Jennie Hlgglns and are not used to accept or relect batch results <br /> Project Manager <br /> 5030457BRS -c4n <br />