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( ' Sequoia 630 Chesapeake Drive 'Redwood Ctv CA 94063 (415) 364 9500 FAX(415) 364 9233 <br /> Analytical 114 1 Ig,,Lane Walnut Creek CA 94598 ,510) 988 9600 FAX(5 10) 988 9673 <br /> 319 Sinker Avenue Suite 8 SaCrainentU CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> *Brown & Caldwell Client Project ID Arco 2133-95-5 Stockton <br /> 9616 Micron Ave Suite 600 Matrix Water <br /> Sacramento CA 95827 <br /> Attention Mindy Patterson QC Sample Group 509-0984 Reported Oct 5 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Lead TRPH <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 200 7 EPA 418 1 <br /> Analyst C Lee C Lee C Lee C Lee K Barta S Phillips <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L 0 50 mg/L 4 0 mg/L <br /> LCS Batch# LCS092795 LCS092795 LCS092795 LCS092795 LCS092695 LCS100495 <br /> Date Prepared: 9/27/95 9/27/95 9/27/95 9/27/95 9/26/95 10/4/95 <br /> Date Analyzed: 9/27/95 9/27/95 9/27/95 9/27/95 9/29/95 10/4/95 <br /> Instrument I D # GCHP 2 GCHP-2 GCHP-2 GCHP-2 P 40 IR-1 <br /> LCS % <br /> Recovery 106 105 105 105 95 82 <br /> Control Limits 75-125 75-125 75-125 75-125 80-120 80.120 <br /> MS/MSD <br /> Batch # 5090701 5090701 5090701 5090701 5090985 SS100195 <br /> Date Prepared: 9/27/95 9/27/95 9/27/95 9/27/95 9/26/95 10/1/95 <br /> Date Analyzed: 9/27/95 9/27/95 9/27/95 9/27/95 9/29/95 10/2/95 <br /> Instrument 1 D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 P-40 IR-1 <br /> Matrix Spike <br /> % Recovery- 101 99 100 100 99 87 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery- 100 97 100 99 99 88 <br /> Relative % <br /> Difference- 10 31 00 1 0 00 1 1 <br /> SEQUOIA ANALYTICAL Please(vote <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> Ha'. 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 /> Janet H an and are not used to accept or(elect batch results <br /> Project Manager <br /> 5090984 SRS <4> <br />