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` SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> xzc".,n'.; <br /> RESNA Industries Client Project ID Arco #2168, Stockton <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Cherven OC Sample Group 204-0711 Reported May 13, 1992 <br /> r r ry r r�4Vr,y r}v • r A r . • v!{l..rA r <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Chloro- <br /> 1,1-Dichloroethene Trichloroethene benzene Cadmium Chromium Lead Nickel <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Analyst M Nguyen M Nguyen M Nguyen S Foster S Foster S Foster S Foster <br /> Reporting Units pg/kg ug/kg fig/kg mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed May 11, 1992 May 11, 1992 May 11, 1992 May 6, 1992 May 6, 1992 May 6, 1992 May 6, 1992 <br /> QC Sample# BLK051192 BLK051192 BLK051192 2040617 204-0617 2044)617 2040617 <br /> MS/MSD MS/MSD MS/MSD <br /> Sample Conc: N D N D N D 19 82 11 110 <br /> Spike Conc. <br /> Added: 10 10 10 50 50 50 50 <br /> Conc. Matrix <br /> Spike: 76 10 86 51 122 58 154 <br /> Matrix Spike <br /> % Recovery: 76 100 86 98 80 94 88 <br /> Conc. Matrix <br /> Spike Dup.: 78 10 88 48 119 57 154 <br /> Matnx Spike <br /> Duplicate <br /> % Recovery: 78 100 88 92 74 92 88 <br /> Relative <br /> %Difference: 26 00 23 61 25 1 7 00 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc at Sample x 100 <br /> 00, Spike Conc Added <br /> LAZ� <br /> Relat"%D+fference Conc of M S -Conc at M S D x 100 <br /> Michael R. Giles Conc of M S + Conc of M S D l 2 <br /> Laboratory Director <br /> 2040705 RES <11 i <br />