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r� <br /> D— Sequoia 680 Chesapeake Drive Redwood City CA 94063 1415) 364 9600 FAX(415) 364 9233 <br /> 1900 Imes Avenue,Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 0gr6Wek, Inc Client Project ID Shell, 141 N uEl Dorado, Stockton, CA v <br /> 1050 Melody Lane, Ste 160 Matnx Air <br /> Roseville, CA 95678 <br /> Attention Paul Graff OC Sample Goup 4110763-765 Reported Dec 2` 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8420 EPA 8020 <br /> Analyst: AT AT AT AT <br /> Concentration <br /> Spiked. 20 +9/L 20pg/L 20ug/L 60Mg/L <br /> LCS Batch# LCS111894 LCS111894 LCS 111894 LCS111894 <br /> Date Prepared 11/18/94 11/18/94 11/18/94 11/18/94 <br /> Date Analyzed 11/18/94 11/18/94 11/18/94 11/18/94 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP 2 GCHP-2 <br />. LCS % <br /> Recovery 99 102 109 107 <br /> i <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 4110735 4110735 4110735 4110735 <br /> Date Prepared: 11/18/94 11/18/94 11/18/94 11/18/94 <br /> Date Analyzed 11/18/94 11/18/94 11/18/94 11/18/94 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP 2 <br /> Matrix Spike <br /> % Recovery, 100 105 110 107 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 105 105 108 <br /> Relative% <br /> Difference 0 0 00 47 093 <br /> SE UOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the CC 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 /> 4110763 FUG a2> <br /> rx, <br />