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r) <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (40) 364.9600 FAX(415) 364-9213 <br /> 404 N.Wiget Lane Walnut Creck,CA 94598 (510) 988.9600 FAX(510)999-9673 <br /> Analytical <br /> 819 Striker Avenue,Suite 8 Sacramcnto,CA 95834 (916) 921.9600 FAX(916)921.0100 <br /> ........... <br /> Terra Vac Corp. Client roject'lD hevron #9-4054 <br /> 1651!Alvarado Street Matrix: Solid <br /> San Leandro, CA 94577 <br /> Attention: Cliff Garrett OC Sample Group: 7100064-081 Reported: Oct 20, 1997 <br /> .............L.............. <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene. Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch#: SP101697 SP101697 SP101697 SP101697 <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 #. 7100623 7100623 7100623 7100623 <br /> Sample Cone.: N.D. N.D. N.D. N.D. <br /> Prepared Date: 10/16/97 10/16/97 10/16/97 10/16/97 <br /> Analyzed Date: 10/16/97 10/16/97 10/16/97 10/16/97 <br /> Instrument I.D.#-. HP-5 HP-5 HP-5 HP-5 <br /> Cone. Spiked: 0.80 mg/kg 0.80 mg/kg 0.80 mg;kg 2.4 mg/kg <br /> Result: 0.67 0.69 0.70 2.2 <br /> IVIS-% Recovery: 84 86 88 92 <br /> Dup. Result: 0.63 0.65 0.65 2.1 <br /> MSD % Recov.: 79 81 81 88 <br /> RPD: 6.2 6.0 7.4 4.7 <br /> RPD Limit: 0-20 0-20 0-20 0-20 <br /> ............. ....... .......................... <br /> ............ . <br /> ..................... <br /> ......................... <br /> —0. 1: <br /> LCS#: 5LCS101697 5LCS101697 5LCS101697 5LCS101697 <br /> Prepared Date: 10/16/97 10/16/97 10/16/97 10/16/97 <br /> Analyzed Date: 10/16/97 10/16,197 10/16/97 10/16/97 <br /> Instrument I.D.#: HP-5 HP-5 HP-5 HP-5 <br /> Cone. Spiked: 20 pg/L 20 pg/L 20pg/L 60 pg/L <br /> LCS Result: is 18 18 56 <br /> LCS % Recov.: 95 90 90 93 <br /> MSIMSD <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. 0 <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> ri n7terference.the LCS recoveqeisto be used to validate the batch. <br /> Melissa A. Brewer MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> Client Services Representative <br /> 7100064.TVC <7> <br />