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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 5900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX (510)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95634 (916) 921 9600 FAX (916) 921 0100 <br /> Brown & Caldwell Client Project lD Arco 2133 Stockton <br /> 9616 Micron Ave , Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Mindy Patterson QC Sample Group 505-1078 Reported Jun 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 K Pocan 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#• LCS060195 LCS060195 LCS060195 LCS060195 LCS052295 LCS060195 <br /> Date Prepared. 6/1/95 6/1/95 6/1/95 6/1/95 5/22/95 6/1/95 <br /> Date Analyzed: 6/1/95 6/1/95 6/1/95 6/1/95 5/26/95 6/1/95 <br /> Instrument I D-#: GCHP-6 GCHP-6 GCHP-6 GCHP-6 P40 IR-1 <br /> LCS °.6 <br /> Recovery, 83 87 87 88 98 85 <br /> Control Limits: 75-125 75-125 75-125 75-125 80-120 80-120 <br /> MS/MSD <br /> Batch # 5051068 5051068 5051068 5051058 5051110 BS060195 <br /> Date Prepared: 5/31/95 5/31/95 5/31/95 5/31/95 5/22/95 6/1/95 <br /> Date Analyzed: 6/1/95 6/1/95 6/1/95 6/1/95 5/26/95 6/1/95 <br /> Instrument LD-#. GCHP-6 GCHP-6 GCHP-6 GCHP-6 P-40 IR-1 <br /> Matrix Spike <br /> % Recovery. 76 79 84 82 98 85 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery* 73 77 85 80 98 88 <br /> Relative% <br /> Difference 40 13 12 25 00 35 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interterent 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 OC limits for MS/MSD's are advisory only <br /> Jane arlan and are not used to accept or reject batch results <br /> Project Manager <br /> 5051078 BRS <6> <br />