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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($t0) 988-9673 <br /> Analytical 819 Straker Avenue,Suite 8 Sacramento,CA 95834 (916) 921.9600 FAX(916) 921-Ot00 <br /> Delta environmental Consultants Clientproject ID: �ocon#7-3330, Stockton, CA A <br /> 3164 Gold Camp Dr., Suite 200 Matrix: Water <br /> Rancho Cordova, CA 95670 <br /> Attention: C. Keoni Almeida QC Sample Group 6011034-37 Reported: Feb 2, 1996:'-: <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xytenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: BW/CC BW/CC BW/CC BW/CC <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#: LCS012996 LCS012996 LCS012996 LCS012996 <br /> Date Prepared: 01/29/96 01/29/96 01/29/96 01/29/96 <br /> Date Analyzed: 01/29/96 01/29/96 01/29/96 01/29/96 <br /> Instrument I.O.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> • LCS % <br /> Recovery: 91 96 101 100 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch #: 6010949 8010949 6010949 6010949 <br /> Date Prepared: 01/29/96 01/29/96 01/29/96 01/29/96 <br /> Date Analyzed: 01/29/96 01/29/96 01/29/96 01/29/96 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery: 85 89 94 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 81 as 93 89 <br /> Relative % <br /> Difference: 4.8 1.1 1.1 4.4 <br /> SEQUOIA 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 emplcyed 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 />,7Project Manager <br /> 6011034.01-T <2> <br />