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Sequoia 680 Chesapeake Gnve Redwood Gty,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Analytical 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988 9673 <br /> $19 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 911-9600 FAX(9 16)921 0100 <br /> "ugro West, Inc Client Project ID 6hell,r6131 Packc Ave, Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Sod <br /> Roseville, CA 95678 <br /> Attention Will Shipp QC Sample Group 5091368,70,72,75-77,83-84 Reported Oct 10, 1995 <br /> r • + ♦rte vJhA ~ \ .~S v L w.v v <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 V Owens V Owens V Owens V Owens <br /> Concentration <br /> Spiked. 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS100595 LCS100595 LCS100595 LCS100595 <br /> Date Prepared 10/5/95 10/5/95 10/5/95 10/5/95 <br /> Date Analyzed: 10/5/95 10/5/95 10/5/95 10/5/95 <br /> Instrument LD # GCHP 1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> 4DRecovery, 100 99 98 98 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> v v t r > t . v r ry vrvr r j <br /> MS/MSD <br /> Batch#' 5091195 5091195 5091195 5091195 <br /> Date Prepared. 10/5/95 10/5/95 10/5/95 10/5/95 <br /> Date Analyzed. 10/5/95 10/5/95 10/5/95 10/5/95 <br /> Instrument I.D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 85 86 87 89 <br /> Matrix Spike <br /> Duplicate % <br /> RCLvvci r: sv o7 ."ii <br /> Relative % <br /> Difference: 12 12 11 96 <br /> SEQUOIA ANALYTICAL Please Note <br /> i The LCS is a control sample of known,interferent fres matrix that is analyzed using the same reagents, <br /> ell, preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> (G( ( validation of sample batch results Due to matrix effects,the OC limits for MS/MSG's are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5091368 FUG <5> <br />