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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> 404 N.Wiget 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 /> .:..::::::: .:.:::.::::..:.. ::.:..:.::.....::....::.::.::::::...::.:.:..::.. ::.::,.:::.s...::.: :...:......... <br /> ' WCON Associates 01erit project Ili: Arco 2186 Stockton <br /> 1433 N. Market Blvd. Matrix: Soil <br /> Sacramento, CA 95834 <br /> Attention: Claudio Avila OC Sample Group 5081509-1516 Reported: Sep 7, 1995? <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#: LCS090595 LCS090595 LCS090595 LCS090595 <br /> Date Prepared: 9/5/95 9/5/95 9/5/95 9/5/95 <br /> Date Analyzed: 9/5/95 9/5/95 9/5/95 9/5/95 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS y <br /> Recovery:: <br /> 89 e7 92 si <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> ' MS/MSD <br /> Batch#: 5081308 5081308 5081308 5081308 <br /> Date Prepared: 9/5/95 9/5/95 9/5/95 9/5/95 <br /> t Date Analyzed: 9/5/95 9/5/95 9/5/95 9/5/95 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> %Recovery: 80 82 83 83 <br /> ' Matrix Spike <br /> Duplicate% <br /> Recovery: 88 90 92 90 <br /> ' Relative% <br /> Difference: 9.5 9.3 10 3.0 <br /> SEQUOIA ANALYTICAL Please Note: <br /> XW4The 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 OC limits for MS/MSD's are advisory only <br /> Linda C. Schneider and are not used to accept or refect batch results. <br /> Project Manager <br /> ' 5081509.EMC a5> <br />