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Sequoia 680 Chesapeake Drive Redwood City, CA 34063 (415) 364-9600 FAX(415) 363.9233 <br /> 404 �I. Wige[Lane Walnut Creek.CA 94598 (510) 988-9600 FAX(510) 988-9673 <br /> Analytical 319 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921-9600 FAX(916) 92 1-0 100 <br /> ... :::...... <br /> ,.;Delta Environmental Consultants Client Project ID: Exxon 7-3330, Stockton <br /> :'3330 Data Drive Matrix: Liquid <br /> Rancho Cordova, CA 95870 <br /> , Reported: Aug 9, <br /> Atte K Almeida Work Order 9507J3 -02 <br /> :.::;:...:n..:�::.. :. .:n<:;+.::......:...........:. ................,;:::�::;:;;::<. ...:... <br /> -QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch* GC080195BTE(02A GCO801958TE(02A GCO80195STECO2A GCM195STEX02A <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 #: 9507H9903 9507H9903 9507H9903 9507H9903 <br /> Sampie Conc.: N.D. N.D. N.D. N.D. <br /> Prepared Date: 8/1/95 8/1/95 8/1/95 8/1/95 <br /> Analyzed Date: 8/1/9$ 8/1/95 8/1/95 8/1/95 <br /> Instrument I.D.#: GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc. Spiked: 10 u9/L 10 lig/L 10 Ng/L 30 Mg/L <br /> Result: 9.7 9.7 9.5 29 <br /> MS % Recovery: 97 97 95 97 <br /> Dup. Result: 9.5 9.4 9.4 28 <br /> MSD % Recov.: 95 94 94 93 <br /> RPU: 2.1 3.1 1.1 3.5 <br /> RPD Limit: 0.50 0-50 x50 0.50 <br /> - S:c«a;<;:>:>5_::i:::::':''•t-""%::c•:::-:>:-:::i-::=i:Si%:>»3::zi�a=;.::�>'ti.`"i' :i'�':'c':':_:'3....,.-....,,w <br /> : <br /> LCS : <br /> Prepared Date: <br /> Analyzed Date: <br /> Instrument I.D.#: <br /> Conc, Spiked: <br /> LCS Result: <br /> LCS % Recov.: <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 is an aliquot of sample <br /> 0i fortified with known quantities of specific compounds and subjected to the entire analytical procedure. If <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 /> ke Gregory :•,� � <br /> Project Manager MS=Matrix Spike.MSO=MS Oupfic3te. RPL -Relative%Difference 9507J38.DLT <2> <br />