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Sequoia So Chesapeake Drive Redwood Cit.y,CA 940630415) 364-9600 FAX(415) 364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-96W FAX(510)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> :MCON Associates Client Project ID: Arco 2168, 8tockton <br /> 1433 N. Market Blvd. Matrix: Soil <br /> Sacramento, CA 95834 <br /> Attention: Matt Turner OC Sample Group 6050465-70 Reported: May 7, 11996�,,,. <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylanes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C.Lee C.Lee C.Lee G.Lee <br /> Concentration <br /> Spiked: 0.20 mg/kg 0,20 mg/kg 0.20 mg/kg 0.60 mg/kg <br /> LCS Batch#: LCS050696 LCS050696 LCS050696 LCS050696 <br /> Date Prepared: 05/06/96 05/06/96 05/06/96 05/06/96 <br /> Date Analyzed: 05/06/96 05/06/96 05/06/96 05/06/96 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery: 95 97 100 98 <br /> Control Limits: 75125 75125 75-125 75125 <br /> ..... ....... <br /> E <br /> MS/MSD <br /> Batch#: 6050457 6050457 6050457 6050457 <br /> Date Prepared: 05/06/96 05/06/96 05/06/96 05/06/96 <br /> Date Analyzed: 05/06/96 05/06/96 05/06/96 05/06/96 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> %Recovery: 82 86 89 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 84 91 90 93 <br /> Relative% <br /> Difference: 2.4 5.6 1.1 3.3 <br /> SEQUOIA ANALYTICAL Please Note: <br /> The LCS is a control sample of known,interferent free mamx that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples. The LCS%recovery data is used for <br /> /7/� validation of sample batch results. Due to matrix effects,�.e QC limits for MS/MSD's are advisory only <br /> and are not used to accept or reject batch results. <br /> (In Schneider T <br /> Project Manager/Sacramento boraroF7 6050465.EMC <2> <br />