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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> RESNA Industries x Client Protect ID Arco #2130, Stockton <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Jay Johnson QC Sample Group 2080440-47 Reported Sep 4, 1992 <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 C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed Sep 1, 1992 Sep 1, 1992 Sep 1, 1992 Sep 1, 1992 <br /> OC Sample # BLKD90192 BLK090192 BLK090192 BLK090192 <br /> Sample Conc . N D N D N D N D <br /> Spike Conc. <br /> Added: 020 020 020 040 <br /> Conc Matrix <br /> Spike: 021 0 21 022 041 <br /> Matrix Spike <br /> % Recovery 105 105 110 102 <br /> Conc Matrix <br /> Spike Dup.. 020 021 022 040 <br /> Matr:x Spike <br /> Duplicate <br /> % Recovery* 100 105 110 100 <br /> Relative <br /> % Difference 4 9 00 00 25 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S Conc of Sample x 100 <br /> Spike Conc Added <br /> l Relative%Difference Conc of M 5 Conc of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc of M S D)/2 <br /> Laboratory Director <br /> 2080440 RES <2> <br />