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' ( ■ ' Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> 404 N.Wi get Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> .................... <br /> i........ ... 0 21-86 StOCon <br /> q96:00W'Associates ent Project0 I <br /> ;: 1433 N. Market Blvd. Matrix: Soil <br /> -Sacramento, CA 95834 <br /> Attention: Claudio Avila QC Sample Group 5081509-1516 Reported: Sep 7, 19957.,"' <br /> .................... ............ <br /> .......... —1....... ........... <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C.Chapman C.Chapman C.Chapman C.Chapman <br /> Concentration <br /> Spiked: 0.20 mg/kg 0.20 mg/kg 0.20 mg/kg 0.60 mg/kg <br /> LCS Batch#: LCS090195 LCS090195 LCS090195 LCS090195 <br /> Date Prepared: 9/1/95 9/11/95 9/1/95 9/1/95 <br /> Date Analyzed: 9/1/95 9/1/95 9/1/95 9/1/95 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery: 87 85 91 90 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> ..... ..... ........... <br /> .. .................. <br /> MS/MSD <br /> Batch #: 5081541 5081541 5081541 5081541 <br /> Date Prepared: 9/1/95 9/1/95 9/1/95 9/1/95 <br /> Date Analyzed: 9/1/95 9/1/95 9/1/95 9/11/95 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> %Recovery: 84 Be 88 87 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 86 88 90 87 <br /> Relative% <br /> Difference: 2.4 2.3 2.2 0.0 <br /> SSEQUOIA ANALYTICAL Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples, The LCS%recovery data is used for <br /> validation of sample batch results. Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Linda C. Schneider and are not used to accept or reject batch results. <br /> Project Manager <br /> 5081509.EMC <4> <br />