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680 Chesapeake Drive Redwood City,CA 94063 (650)304-VOW rr %.,...r --- <br /> Sequoia q44 N.Wiget Lane walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> 819 Striker Avenue.Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)-921-0100 <br /> Analytical 707 792-1865 FAX(707)792-0342 <br /> 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 ( ) <br /> F <br /> Services Client Project ID: Shell 1267 Country Club <br /> A.ve.A 95112an Th9e QC Sample Group: 9805662-01-06, .-0$ Reported: May 21, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix: Liquid <br /> Method: EPA 8020 <br /> Analyst: G. Peshina <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch#: GCO51998BTEX06A <br /> Sample No.: 9805350-10 <br /> Date Prepared: 5119198 5119198 5119/98 5119198 <br /> Date Analyzed: 5119198 5119198 5119198 5119198 <br /> Instrument I.D.#: GCHP-06 " GCHP-06 GCHP-06 GCHP-06 <br /> J <br /> Sample Cone.,ug/L: N.D. N.D. N.D. N.D. <br /> Conc.Spiked, ug/L: 10 10 10 30 <br /> Matrix Spike,uglL:; 9.5 9.4 9.6 28 <br /> %Recovery: 95 94 96 93 - <br /> y— <br /> Matrix <br /> pike Duplicate,ug/L: 9.2 9.1 9.2 28 <br /> %Recovery: 92 91 92 93 <br /> elative%Difference: 3.2 3.2 4.3 0.0 <br /> RPD Control Limits: 0-25 0-25 0-25 0-25 <br /> LCS Batch#: GC051998BTEX06A <br /> Date Prepared: 5119198 5119198 5119198 5/19198 <br /> Date Analyzed: 5119198 5119198 5119198 5119198 <br /> Instrument I.D.#: GCHP-06 GCHP-06 GCHP-06 GCHP-06 <br /> Conc.Spiked,ug/L: 10 10 10 30 <br /> LCS Recovery,ug/L: 10.0 9.81 10.0 31 <br /> LCS%Recovery: 100.0 98 100.0 103 <br /> Percent Recovery Control Limits: <br /> MS/MSD 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Quality Assur a Statement: All standard operating procedures and quality control requirements have been met. <br /> Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SNL 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 dug to matrix <br /> interference,the LCS recoveryis to be used to validate the batch. ' <br /> PtyPennert7 <br /> Project Manager <br />