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cj <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 {415) 364 9600 FAX (415) 364 9233 <br /> Analytical "I Sates Avenue SwI,L Concora CA 94520 15 10) 686 9600 FAX (510) 686 9689 <br /> 819 Sinker Avenue Siete 8 Sacramento CA 95834 1916) 921 9600 FAX (916)921 0100 <br /> W-rown & Caldwell Client Project ID Arco 2133-94-5 Stockton <br /> 9616 Micron Avenue Suite 600 Matrix Water <br /> Sacramento CA 95827 <br /> Attention Mindy Wright QC Sample Group 406-0676 Reported Jun 29 1994 <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 Chiaravallotl Chiaravalloh Chiaravalloh Chiaravalloti <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS062194 LCS062194 LCS062194 LCS062194 <br /> Date Prepared 6/21/94 6/21/94 6/21/94 6/21/94 <br /> Date Analyzed 6/21/94 6/21/94 6/21/94 6/21/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery- 104 101 103 102 <br /> Control Limits: 75.125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch #- 4060751 4060751 4060751 4060751 <br /> Date Prepared. 6/21/94 6/21/94 6/21/94 6/21/94 <br /> Date Analyzed. 6/21/94 6/21/94 6/21/94 6/21/94 <br /> Instrument I D.# HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> % Recovery 99 93 96 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 110 99 100 97 <br /> Relative % <br /> Difference 11 53 41 42 <br /> SEQUOIA ANALYTICAL I Please Note <br /> The LCS is a control sample of known interferent free matnx that Is analyzed using the same reagents, <br /> f 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 QC limits for MS/MSD s are advisory only <br /> Craig C Lee and are not used to accept or reject(latch results <br /> Project Manager <br /> 4060676 SRS <3> <br /> T <br />