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Sequoia 680 Chesapeake Dnve Redwood Cicv CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue quite L Concord CA 94520 (5101 686 9600 FAX(5 10)686 %89 <br /> Analytical 319 Sinker Avenue -,utte 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Brown & Caldwell Client Project ID Arco 2133, Stockton <br /> 9616 Micron Ave Suite 600 Matrix Water <br /> Sacramento CA 95827 <br /> Attention Mindy Patterson OC 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 l D.# GCHP-6 GCHP-6 GCHP-6 GCHP-6 P-40 IR-1 <br /> LCS % <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 5051068 5051110 SS060195 <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 I D.#: 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 1 3 12 25 00 35 <br /> SEQUOIA 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 matnx 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 SRS <6> <br />