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SEQUOIA ANALYTICAL - <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> 'J� RESNA Industries w Client Project ID Arco #2168, Stockton <br /> 3164 Gold Camp Dr, Suite 200f <br /> Rancho Cordova, CA 95670 <br /> Attention David Stavarek QC Sample Group 3010563-64 <br /> Reported Feb 3, 1993 <br /> v l , Y J , "i v r . `Y v sc`v'n�a'5.,4 vim.w..xch�'.`.v.S.' 4�•., v }vx <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichioro- Tnchloro- <br /> Benzene Toluene Ethylbenzene X lenes ethene ethane Chlorobenzene <br /> Method E7A 602 EPA 602 EPA 602 EDP e32 EPA 631 EPA C01 EPA 601 <br /> Analyst Chiaravallob Chiaravallots Chiaravailob Chiaravailch K Nil! K Nill K Niil <br /> Reporting Units ug/L ug/L ug/L ug/L ug/L ug/L ue/L <br /> Date Analyzed Feb 2 1993 Feb 2, 1993 Feb 2 1993 Feb 2, 1993 Jan 28, 1993 Jan 28, 1993 Jan 28. 1993 <br /> QC Sample # BLK020293 BLK020293 BLK020293 BLK020293 BLK012893 BLK012893 BLK012M <br /> MS/MSD MS/MSD MS/MSD <br /> Sample Cone N D N D N D N D N D N D N D <br /> Spike Cone. <br /> • Added: 10 10 10 20 10 10 10 <br /> Cone. Matrix <br /> Spike: 87 91 89 17 11 10 10 <br /> Matrix Spike <br /> % Recovery: 87 91 89 85 110 100 100 <br /> Cone. Matrix <br /> Spike Dup . 92 99 96 18 11 10 10 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 92 99 96 90 110 100 100 <br /> Relative <br /> % Difference: 56 84 76 57 00 00 00 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTIC A %Recovery Cone of M S -Conc of Sample x 100 <br /> Spike Cone Added <br /> Relat►ve%Difference Cone of M S -Cone of M S D x 100 <br /> Michael R Giles (Cone of M S + Cone of M S D)/2 <br /> Laboratory Director 3010563 RES <5> <br />