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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> 404 N.V iiget Lane Walnut Creek,CA 94598 (510) 988.9600 FAX(510)988-9673 <br /> �rrl,�► Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921.9600 FAX(916)921.0100 <br /> �MCON Associates ClientProjed"I'l): A�co+218s;Stocfitori""""`" <br /> 1433 N. Market Bivd. Matrix: Soil <br /> Sacramento, CA 95834 <br /> Attention: Claudio Avila QC Sample Group 509-0284 Reported: Sep 12, 1995:" <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- Reactive Reactive - <br /> ' Benzene Toluene Benzene Xylenes Sulfide Cyanide Lead <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 SW-846 SW-846 EPA 6010 <br /> Analyst: V.Owens V.Owens V.Owens V.Owens K.Newberry A.Pina K.Barta <br /> Concentration <br /> Spiked: 0.20 mg/kg 0.20 mg/kg 0.20 mg/kg 0.60 mg/kg 10 mg/L 0.20 mg/L 50 mg/kg <br />' LCS Batch#: LCS091295 LCS091295 LCS091295 LCS091295 LCS091195 LCS091195 LCS090895 <br /> Date Prepared: 9/12/95 9/12/95 9/12/95 9/12/95 9/11/95 9/11/95 9/8/95 <br /> aDate Analyzed: 9/12/95 9/12/95 9/12/95 9/12/95 9/11/95 9/11/95 9/11/95 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 Manual Manual P-40 <br /> LCS% <br /> Recovery: 100 100 100 too 99 38 99 <br /> Control Limits: 75-125 75.125 75.125 75-125 80.120 6.5-40 80.120 <br /> MS/MSD <br /> Batch #: BS091295 65091295 BS091295 BS091295 N/A N/A 5090284 <br /> Date Prepared: 9/12/95 9/12/95 9/12/95 9/12/95 N/A N/A 9/8/95 <br />' Date Analyzed: 9/12/95 9/12/95 9/12/95 9/12/95 N/A N/A 9/11/95 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 N/A N/A P-40 <br />' Matrix Spike <br /> %Recovery: 88 84 82. 85 N/A N/A 92 <br /> Matrix Spike <br />' Duplicate% <br /> Recovery: 988 98 97 98 N/A N/A 88 <br /> Relative% <br /> Difference: 13 15 17 14 N/A N/A 4.4 <br /> SEQUOIA ANALYTICAL Please Mote: <br /> The LCS Is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> reparation 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 /> Janet H an and are not used to accept or reject batch results. <br /> Project anager <br />' 5090284.EMC <4> <br />