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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> Analytical 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510) 686 9689 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Canonie Environmental Client Project ID 94-348, San Joaquin C C <br /> 1710 Main Street Matrix Liquid <br /> Escalon, CA 95320 <br /> Attention Greg Stahl Work Order # 9502146-02-5 Reported Feb 16, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO20795BTEX03A GCO207958TEX03A GCO20795BTEX03A GCO20795BTEX03A <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD#: 9501 F0001 9501 F0001 9501 F0001 9501 F0001 <br /> Sample Cone : N D N D N D N D <br /> Prepared Date 2/7/95 2/7/95 2/7/95 2/7/95 <br /> Analyzed Date. 2/7/95 2/7/95 2/7/95 2/7/95 <br /> Instrument I D.#: GCHP3 GCHP3 GCHP3 GCHP3 <br /> Cone. Spiked- 10pg/L 10,ug/L 10pg/L 30pg/L <br /> Result: 93 91 94 28 <br /> MS %Recovery: 93 91 94 93 <br /> Dup Result. 83 82 83 25 <br /> MSD% Recov- 83 82 83 83 <br /> RPD. 11 10 12 11 <br /> RPD Limit: 0-50 0-50 0-50 0-50 <br /> LCS # - - - - <br /> Prepared Date - - - - <br /> Analyzed Date - - - - <br /> Instrument I D # - - - _ <br /> Cone Spiked - - - <br /> LCS Result - - _ - <br /> LCS % Recov - - - _ <br /> MS/MSD <br /> LCS 71-133 72-128 72-130 71-120 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> 4wacoL— <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Vickie Tague Clark <br /> Project Manager '"MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9502146 CAN <2> <br />