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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 9219600 • FAX (916) 921-0100 <br /> RESNA Industries Client Project ID Arco #2130, Stockton <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Jay Johnson OC Sample Group 2080488-89 Reported Sep 4, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 602 EPA 602 FPA 602 EPA 61712 <br /> Analyst Chiaravallob Chiaravalloti Chiaravalloti Chiaravalloti <br /> Reporting Units ppb ppb ppb ppb <br /> Date Analyzed Sep 1, 1992 Sep 1, 1992 Sep 1, 1992 Sep 1, 1992 <br /> QC Sample# 208-0484 208-0484 208-0484 208.0484 <br /> Sample Cone.. N D N D N D N D <br /> Spike Cone. <br /> Added 10 10 10 20 <br /> Cone. Matrix <br /> Spike: 10 10 11 20 <br /> Matrix Spike <br /> %Recovery 100 100 110 100 <br /> Conc. Matrix <br /> Spike Dup 10 11 11 21 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery. 100 110 110 105 <br /> Relative <br /> % Difference: 00 95 00 49 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL %RecoveryConic of M S Conc of Sample x 1 <br /> p 00 <br /> Spike Conc Added <br /> Relative 96 Difference Conc of M S -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 /> 2080488 RES a2> <br />