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Sequoia 680 Chesapeake Drive Redwood Qty,CA 94063 (415) 364-9600 FAX(415)364-9233 <br /> ' Analytlea1 404 N Wiget Lane Walnut Creek CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> qNJr 819 Striker Avenue Suite a Sacramento, CA 95834 (916) 921 9600 FAX(916)921 Ot00 <br /> =ugro West, Inc Client project Ifs Shelf, 6131 pacific Ave, Stockion, 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 /> 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#• LCS100995 LCS100995 LCS100995 LCS100995 <br /> Date Prepared: 10/9/95 10/9/95 10/9/95 10/9/95 <br /> Date Analyzed: 10/9/95 10/9/95 10/9/95 10/9/95 <br /> Instrument I D #: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS <br /> Recovery, ss 99 100 101 <br /> Control Limits* 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# 5100280 5100280 5100280 5100280 <br /> Date Prepared: 10/9/95 10/9/95 10/9/95 10/9/95 <br /> Date Analyzed: 10/9/95 10/9/95 10/9/95 10/9/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery- 94 94 94 97 <br /> Matrix Spike <br /> Duplicate% <br /> r, <br /> HeCO eiy: 101 102 102 104 <br /> Relative% <br /> Difference 7 1 8 2 82 7 0 <br /> SEQUOIA ANALYTICAL Please Note <br /> { c 4 <br /> '7 /� The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> /j� /� The <br /> and analytical methods employed for the samples The LCS%recovery data is used for <br /> L iC�G (//i' (rL/ validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5091368 FUG <3> <br />