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.ti •` <br /> SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> } <br />• I 1/Teicn hertTrcy <br /> 3164 Gold Camp Dr, Suite 200 Matrix: Water <br /> Rancho Cordova, CA 95670 <br /> Attention: Claudio Avda OC Sample Group- 3100570-573 Reported Oct 19 1993 <br /> 0 QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene benzene xyienes <br /> • <br /> Method: EPA 8020 EPA 8= EPA 8020 EPA 8020 <br /> Analyst: Chiaravailoti Chiaravalio4 Chiaravailoti Chiaravaiiot► <br /> Ccncentratian <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> • LCS Batch#: LCS101893 LCS101893 LCS101893 LCS101893 <br /> Date Prepared: 10/18/93 10/18/93 10/18/93 10/18/93 <br /> Date Analyzed: 10/18/93 10/18/93 10/18/93 10/18/93 <br /> Instrument I D #• HP2 HP2 HP2 HP2 <br />•� LCS % <br /> Recovery: 91 90 92 93 <br /> Control Limits: 80-120 80-120 80-120 80.120 <br />• MS/MSD <br /> Batch#- 3100573 3100573 3100573 3100573 <br /> Date Prepared: 10/18/93 0118193 10/18/93 0/18/93 <br /> Date Analyzed, 10/18/93 10/18/93 10/18/93 10/18/93 <br /> Instrument I.D.#• HP2 HP2 HP2 HP2 <br />• <br /> Matrix Spike <br /> %Recovery' 97 35 95 33 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery* 110 •00 100 103 <br /> Relative% <br /> Difference: 13 51 51 10 <br /> Please Note <br />• The LCS is a centmi sample of known,interterent free matnx that is anafyzea using the same reagent j <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery Data is used for <br /> valKWOM of sample batch results Due to matrix effects the OC:1mn3 tOr MS/MSD's are aavisory only <br /> TUn/da <br /> and are not used to acceot or resect batch results <br /> C. Schneider <br /> 0 Project Manager 310MM RES <2> <br />