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Sequoia 610 Cheupake Drive Redwood City,CA 94063 (415) 964-9600 FAX(415) 364.9233 <br /> Analytical 404 N.Wlset lane Walnut Creek,CA 94591 (510) 911.9600 FAX(5 10)9/1-9673 <br /> 119 Striker Avenue,Suite 1 Sacnmento,CA 93034 (916) 921.9600 FAX(916)92t•0300 <br /> Alton Geosclence Client Project ID; Mobil+#04-343,'Tracy <br /> 30-A Lindbergh Ave. Matrix: Liquid <br /> Livermore, CA 94550 <br /> Attention: A: LeMay OC Sample Group: 5102080-090 Reported: Nov 3, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch#: GC103195 GC103195 GC103195 GC103195 <br /> 802009A 80MA 802009A 802009A <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method: EPA 5030 EPA 5030 EPA$030 EPA 5030 <br /> Analyst: K.Nill K.Nill K. Nill K.Nill <br /> MS/MSD#: 5102590 5102590 5102590 5102590 <br /> Sample Cone.: N.D. N.D. N.D. N.D. <br /> Prepared Date: 10/31/95 10/31/95 10/31/95 10/31/95 <br /> Analyzed Date: 10/31/95 10/31/95 10/31/95 10/31/95 <br /> Instrument I.D.#: HP-9 HP-9 HP-9 HP-9 <br /> Cone. Spiked: 20pg/L 20pg/L 20pg/L 60pg/L <br /> Result: 21 21 21 69 <br /> MS%Recovery: 105 105 105 115 <br /> Dup. Result: 18 18 18 60 <br /> • MSD %Reeov.: 90 90 90 100 <br /> RPD: 15 15 15 14 <br /> RPD Limit: 0-20 0.20 0-20 0.20 <br /> LCS#: 41-CS103195 4LCS103195 41-CS103195 4LCS103196 <br /> Prepared Date: 10/31/95 10/31/95 10/31/95 10/31/95 <br /> Analyzed Date: 10/31/95 10/31/95 10/31/95 10/31/95 <br /> Instrument I.D.#: HP-9 HP-9 HP-9 HP-9 <br /> Cone. Spiked: 20pg/L 20pg/L 20pg/L 60pg/L <br /> LCS Result: 17 17 17 57 <br /> LCS %Recov.: 86 s6 85 95 <br /> LCS 71-133 72-128 72-130 71-120 <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. M <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Interference,the LCS recovery is to be used to validate the batch. <br /> Kevin Van Slarnbrook •'MS-Matrix pike,MSD=MS uplicate, =Relative%Difference <br /> Project Manager <br /> 5102080.ALT <7> <br />