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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> Aegis Environmental Consultants Client Project ID Sheli, 141 N EI Dorado, Stockton <br /> 950 Melody Lane, Ste 160 Matrnc Water <br /> seville, CA 95678 <br /> Attention Paul Graff OC Sample Group 308-0711 Reported Aug 25 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene benzene Xylenes <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst ChiaravailoU Chiaravalioti Chsaravailots Chiaravalioti <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#- LCS082493 LCS082493 LCS082493 LCS082493 <br /> Date Prepared 8/24/93 8/24/93 8/24/93 8/24/93 <br /> Date Analyzed 8/24/93 8/24/93 8/24/93 8/24/93 <br /> Instrument l D #- HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery- 104 106 105 104 <br /> abontrol Limits 80.120 80-120 80-120 80.120 <br /> MS/MSD <br /> Batch #• 3080726 3080726 3080726 3080726 <br /> Date Prepared. 8/24/93 8/24/93 8/24/93 8/24/93 <br /> Date Analyzed: 8/24/93 8/24/93 8/24/93 8/24/93 <br /> Instrument I D #: HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> % Recovery: 92 97 98 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 100 110 110 105 <br /> Relative% <br /> Difference: 83 13 12 15 <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> I validation of sample batch results Due to matrix effects the QC limits for MS/MSD s are advisory only <br /> l and are not used to accent or resect batch results <br /> Linda C Schneider <br /> Project Manager 3080711 AEG <2> <br />