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Sequoia 680 Chesapeake Drive Redwood CGty,CA 94063 (415) 364-9600 FAX(415)364-9233 <br /> Analytiea� 404 r1 W gec Lane Walnut Creek,CA 94598 (510) 968 9600 FAX(510) 468 9673 <br /> 819 Sinker Avenue,SLnte 3 Sacramento,CA 95634 (916) 921-9600 FAX(916)921-0100 <br /> 1=ugro West, Inc` Client i�roject!0 'AlShell,i 41 N EI t)o"rado,btockon, CA <br /> 1050 Melody Lane, Ste 160 Matrix Water <br /> Roseville, CA 95678 <br /> Attention Sudhakar Talanki QC Sample Group 509-0177 Reported Sep 15, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xyienes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst- C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spitted: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#. LCS091595 LCS091595 LCS091595 LCS091595 <br /> Date Prepared' 9/15/95 9/15/95 9/15/95 9/15/95 <br /> Date Analyzed: 9/15/95 9/15/95 9/15/95 9/15/95 <br /> Instrument I.D.#• GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery: 103 102 102 102 <br /> Control Limits. 75-125 75-125 75-125 75-125 <br /> w h !+ v +v y r !t h! h { <br /> MS/MSD <br /> Batch #: BS091595 SS091595 BS091595 BS091595 <br /> Date Prepared: 9/15/95 9/15/95 9/15/95 9/15/95 <br /> Date Analyzed: 9/15/95 9/15/95 9/15/95 9/15/95 <br /> Instrument I.D.#' GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery: 83 82 93 91 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 93 92 94 94 <br /> Relative% <br /> Difference: 11 11 1 1 32 <br /> SEQUOIA ANALYTICAL lease 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 /> l validation of sample batch results Due to matrix effects,the CC limits for MS/MSD's are advisory only <br /> Linda Schneider `-�� and are not used to accept or reject batch results <br /> Project Manager <br /> 5090177FUG <6> <br />