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I <br /> - Sequoia 680 Chesapeake Drivc Redwood Ciry,CA 94063 (415) 364-96(X1' FAX(415) 364.9133 <br /> 404 N.WiBet Lane Walnut Creek,CA 94598 (510) 988-9604 FAX(510)988.9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 911.9600 FAX(916)911-0100 <br /> Terra Dac Cor - <br /> p• Client Project ID: Chevron#9-4054 <br /> 1651 Alvarado Street Matrix: Solid <br /> I <br /> San Leandro, CA 94577 <br /> Attention Cliff Garrett OC Sample Group: 7100064-081 <br /> ,.Reported Oct 20, 199T;.' <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> CIC Batch#: SP101397 SP101397 SP101397 SP101397 <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: D.Newcomb D.Newcomb D.Newcomb D.Newcomb <br /> MS/MSD #: 7100261 7100261 7100261 7100261 <br /> Sample Conc.: 0.0060 mg/kg ,0.010 mg/kg 0.0050 mg/kg 0.018 mg/kg <br /> Prepared Date: 10/13/97 10/13/97 10/13/97 10/13/97 <br /> Analyzed Date: 10/13/97 10/13/97 10/13/97 10/13/97 <br /> Instrument I.D.#: HP-5 HP-5 HP-5 HP-5 <br /> Conc. Spiked: 0.80 mg/kg 0.80 mg/kg 0.80 mg/kg 2.4 mg/kg <br /> Result: 0.67 0.68 0.68 2.1 <br /> MS % Recovery: 83 84 84 87 <br /> Dup. Result: 0.70 0.71 <br /> 0.71 2.2 , <br /> MSD % Recov.: 87 88 88 91 <br /> RPD: 4.4 4.4 4.4 4.7 <br /> RPD Limit: 0-20 0.20 0-20 0-20 <br /> .........:. <br /> LCS #: 5LCS101397 5LCS101397 5LCS101397 5LCS101397 <br /> Prepared Date: 10/13/97 10/13/97 10/13/97 10/13/97 <br /> Analyzed Date: 10/13/97 10/13/97 10/13/97 10/13/97 <br /> Instrument I.D.#: HP-5 HP-5 HP-5 HP-5 I <br /> Conc. Spiked: 20mg/L 20ug/L 20jrg/L 60ug/L <br /> LCS Result: 19 18 18 55 <br /> LCS %Recov.: 95 90 90 92 <br /> I <br /> LCS 50.150 50-150 50-150 50-150 <br /> Control Limits <br /> p <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 #1271 <br /> 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. If ' <br /> tse recovery of analyies from the matrix spike does not fall within specified control limits due to matrix <br /> F interference,the LCS recovery is to be used to validate the batch. <br /> Melissa A. Brewer MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference <br /> Client Services Representative II <br /> 7100064.TVC <6> 4 <br />