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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364.9600 FAX(415) 364.9233 <br /> 4D 404 N.Wiget Lane Walnut Crede,CA 94598 (510) 988-9600 FAX(510)988.9673 <br /> X111 Analytical 819 Striker Avenue.Suite 8 Sacramento,CA 95834 (916) 921.9600 FAX(916)921.0100 <br /> TEL (Wichita) Client Project ID: Chevron #9-0557 )Stockton <br /> 4211 May Ave. Matrix: Solid <br /> Wichita, KS 87209 <br /> Attention: Justin Ward QC Sample Group: 5120418-419 Reported: Dec 29, 1995<' <br /> .... <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#: GC121595 GC121595 GC121595 GC121595 <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/MSD #: 5120419 5120419 5120419 5120419 <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Prepared Date: 12/15/95 12/15/95 12/15/95 12/15/95 <br /> Analyzed Date: 12/15/95 12/15/95 12/15/95 12/15/95 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> Conc. Spiked: 0.80 mg/kg 0.80 mg/kg 0.80 mg/kg 2.4 mg/kg <br /> Result: 0.74 0.78 0.80 2.4 <br /> MS % Recovery: 92 98 100 100 <br /> Dup. Result: 0.75 0.79 0.81 2.4 <br />•MSD % Recov.: 94 99 101 100 <br /> RPD: 1.3 1.3 1.2 0.0 <br /> RPD Limit: 0-20 0-20 0-20 0-20 <br /> LCS #: 2LCS121595 2LCS121595 2LCS121595 2LCS121595 <br /> Prepared Date: 12/15/95 12/15/95 12/15/95 12/15/95 <br /> Analyzed Date: 12/15/95 12/15/95 12/15/95 12/15/95 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> Conc. Spiked: 20yg/L 20Mg/L 20pg/L 60pg/L <br /> LCS Result: 1e 17 17 54 <br /> LCS % Recov.: 80 85 85 90 <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-tree matrix that is analyzed using the same reagents, <br /> !# A�[ALYTICAL, #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 /> interference.the LCS recovery is to be used to validate the batch. <br />*K;eet L. Winmer MS=Matrix Spike. MSD=NIS Duplicate, RPO=Relative% Difference <br /> Prokct Manager <br /> 5120416.GT'W <3> <br /> T, <br />