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Sequoia 680 Chesapeake Drive Redwood Gtv CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Analytical <br /> 1900 dates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(5101 686 9689 <br /> 819 Straker Avenue Suite 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 Goup 502-0287 Reported Feb 24, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes TRPH Lead <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 418 1 EPA 200 7 <br /> Analyst C Chapman C Chapman C Chapman C Chapman V Owens K Barta <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L 5 0 mg/L 0 50 mg/L <br /> LCS Batch#• LCS021095 LCS021095 LCS021095 LCS021095 LCS022395 LCS021395 <br /> Date Prepared: 2/10/95 2/10/95 2/10/95 2/10/95 2/23/95 2/13/95 <br /> Date Analyzed: 2/10/95 2/10/95 2/10/95 2/10/95 2/23/95 2/15/95 <br /> Instrument LD.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 IR-1 P-40 <br /> LCS % <br /> Recovery: 90 90 90 90 91 110 <br /> Control Limits: 75-125 75-125 75-125 75-125 80-120 80-120 <br /> f. . <br /> MS/MSD <br /> Batch#- 5020238 5020238 5020238 5020238 BLK022395 5020137 <br /> Date Prepared: 2/10/95 2/10/95 2/10/95 2/10/95 2/23/95 2/13/95 <br /> Date Analyzed: 2/10/95 2/10/95 2/10/95 2/10/95 2/23/95 2/15/95 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 IR-1 P-40 <br /> Matrix Spike <br /> % Recovery: 98 95 95 93 91 115 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 97 98 95 93 89 118 <br /> Relative% <br /> Difference: 1 0 1 0 00 00 22 2 8 <br /> SEQUOIA ANALYTICAL Please Rote <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 /> Jennie Higgins and are not used to accept or reject batch results <br /> Project Manager <br /> 5020282.8RS <6> <br /> f - - <br />