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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord California 94520 <br /> (415) 686-9600 • FAX (415) 686-9689 <br /> Applied GeoSystems(Sacramento) Client Project ID Arco#2130-90-1/Stockton <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Frick QC Sample Group 109-0208 Reported Sep 9, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8015/8020 EPA 8015/8020 PA 8015/802 PA 8015/8020 <br /> Analyst J Fontecha J Fontecha J Fontecha J Fontecha <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Sep 6, 1991 Sep 6 1991 Sep 6 1991 Sep 6, 1991 <br /> QC Sample# 108.1368 108-1368 108-1368 108-1368 <br /> Sample Conc . N D N D N D N D <br /> Spike Conc. <br /> Added 040 040 040 1 2 <br /> Conc. Matrix <br /> Spike: 039 039 042 1 3 <br /> Matrix Spike <br /> %Recovery- 98 98 100 110 <br /> Conc Matrix <br /> Spike Dup 039 039 042 13 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 98 98 100 110 <br /> Relative <br /> %Difference: 0 0 0 0 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> ,10. <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Ju a R Malerstein (Conc of M S + Conc of M S D)/2 ject Manager 1090208 APS <2> <br />