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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 /> SII Analytical 815 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916) 921-0100 <br /> .:.::..�.:...:.... ::.:::::.::::.. .a>..... -;o.�:•:::^:cry.:.�:::<•..a<:. ..:.. ............. .. <br /> a Environmental Consultants Client Project ID: 5�&on #7-3330,Stocliton,­CA <br /> 3164 Gold Camp Dr., Suite 200 Matrix: Water <br /> Rancho Cordova, CA 95670 <br /> Attention: C. Kean!Almeida OC Sample Group 6040576-79 Reported: Apr 22, 1996 r <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X lenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: V.Owens V.Owens V.Owens V.Owens <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#: LCSO41696 LCSO41696 LCSO41696 LCS041696 <br /> Date Prepared: 04/16/96 04/16/96 04/16/96 04/16/96 <br /> Date Analyzed: 04/16/96 04/16/96 04/16/96 04/16/96 <br /> Instrument I.D.#: GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> LCS % <br /> Recovery: 102 102 104 103 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch #: 6040495 6040495 6040495 6040495 <br /> Date Prepared: 04/16/96 04/16/96 04/16/96 04/16/96 <br /> Date Analyzed: 04/16/96 04/16/96 04/16/96 04/16/96 <br /> Instrument I.D.#: GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> % Recovery: 86 91 91 91 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 98 99 100 100 <br /> Relative % <br /> Difference- 13 8.4 9.4 9.4 <br /> SEQUOIA ANALYTICAL Please(Vote: <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 /> inda C. Schneider and are not used to accept or reject batch results. <br /> Project Manager/Sacramento Labors ory <br /> 6040576.OLT <3> <br />