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r) <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364.%00 FAX(415) 364-9233 <br /> 404 N. Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> Analytical <br /> 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921-9600 FAX(916)921.0 100 <br /> Terra Vac Corp: <br /> Client project"I'D: Chev'ro"n' #9-4054 <br /> 1651 Alvarado Street Matrix: <br /> Solid <br /> San Leandro, CA 94577 <br /> Attention: Cliff Garrett OC Sample Group: 7100064-081 <br /> Reported: Oct 20. 1997. <br /> .......... <br /> QUALITY CONTROL DATA REPORT <br /> 'Analyte: Benzene Toluene <br /> Ethyl Xylenes <br /> Benzene <br /> QC Batch#: SP100997 SPI00997 SPI00997 SPI00997 <br /> 8020EXA 8020EXA 8020EXA 8020EXA <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> I Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: K. Nill K. Nill K. Nill K.Nill <br /> MS/MSD #: 7100209 7100209 7100209 7100209 <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Prepared Date: 10/9/97 10/9/97 10/9/97 10/9/97 <br /> Analyzed Date: 10/9/97 10/9/97 10/9/97 10/9/97 <br /> Instrument LD.#: HP-5 HP-5 HP-5 HP-5 <br /> Cohc. Spiked: 0.80 mg/kg 0.80 mg/kg 0.80 mg/kg 2.4 mg/kg <br /> Result: 0.68 0.69 0.69 2.2 <br /> MS % Recovery: as 86 86 92 <br /> Dup. Result: 0.70 0.72 0,72 2.2 <br /> MSD % Recov.: 88 90 90 92 <br /> RPD: 2.9 4.3 4.3 0.6 <br /> RPD Limit: 0-20 0-20 0-20 0-20 <br /> .......... <br /> .............. <br /> .......... <br /> LCS #: 51-CS100997 5LCS100997 5LCS100997 5LCS100997 <br /> Prepared Date: 10/9/97 10/9/97 10/9/97 10/9/97 <br /> Analyzed Date: 10/g/97 10/9/97 10/9/97 10/9/97 <br /> Instrument I.D.#: HP-5 HP-5 HP-5 HP-5 <br /> Conc. Spiked: 20 yg/L 20 pg/L 20;jg/L 60 lig/L <br /> LCS Result: 20 20 19 59 <br /> LCS % Recov.: 100 100 95 98 <br /> MS/MS13 <br /> LCS 50-150 50-150 50-150 50-150 <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, #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. If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> iNteerence,the LCS recovery is to be used to validate the batch, <br /> Melissa A. Brewer M5=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Ditference <br /> Client Services Representative <br /> 7100064.TVC <4> <br />