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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364.9600 FAX(415) 364-9233 <br /> (i) 404 N. Wiget Lane Walnut Creek,CA 94598 (510) 9a8.9600 FAX (5i0)988.9673 <br /> Analytical 819 Striker Avenue, Suitc 8 Sacramento,CA 95834 (916) 921.9600 FAX (916)921-0100 <br /> TEL {Wichita} Client Project 1D: Chevron #9-0557 %Stockton <br /> 4211 May Ave. Matrix: Solid <br /> Wichita, KS 67209 <br /> Attention: Justin Ward CC Sample Group: 5120416-418 Reported: Dec 29, 1995;::; <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#: GC121495 GC121495 GC121495 GC121495 <br /> 8020EXA 8020EXA 8020EXA 8020EXA <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: N.Beaman N. Beaman N. Beaman N. Beaman <br /> MS/MSO #: 5120408 5120408 5120408 5120408 <br /> Sample Conc: N.D. N.D. N.D. N.D. <br /> Prepared Date: 12/14/95 12/14/95 12/14/95 12/14/95 <br /> Analyzed Date: 12/14/95 12/14/95 12/14/95 12/14/95 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 <br /> Conc. Spiked: 0.40 mg/kg 0.40 mg/kg 0.40 mg/kg 1.2 mg/kg <br /> Result: 0.39 0.42 0.44 1.3 <br /> MS % Recovery: 98 105 110 108 <br /> Dup. Result: 0.39 0.41 0.43 1.3 <br />•MSD % Recov.: 98 93 108 108 <br /> RPD: 0.0 2.4 2.3 0.0 <br /> RPD Limit: 0-20 0-20 0-20 0-20 <br /> LCS #: 2LCS121495 2LCS121495 2LCS121495 2LCS121495 <br /> Prepared Date: 12/14/95 12/14/95 12/14/95 12/14/95 <br /> Analyzed Date: 12/14/95 12/14/95 12/14/95 12/14/95 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 <br /> Conc. Spiked: 20pg/L 20Ng/L 20jig/L 60Ng/L <br /> LCS Result: 20 21 21 66 <br /> LCS % Recov.: 100 105 105 110 <br /> LCS <br /> Control Limits 55-145 47-149 47-155 56-140 <br /> Please Note: <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQ4PIA,-' 1NALYTICAL, #1271 preparation,and analytical methods employed for the samples. The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure. It <br /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> r interference,the LCS recoveryis to be used to validate the batch. <br /> 1 <br /> Ke et L imer MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference <br /> Proj ct Manager <br /> 5120416.GTW <2> <br /> i <br />