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1Z Sequoia (380 Chesapeare Drive Redwood Cav CA 94063 415) 364 9600 FAX(415) 364 9233 <br /> 1%0nalyt eel 1900 Bates Avenue �u:te L Concord CA 94520 510) 686 9600 FAX (510) 686 9689 <br /> 319 Stnker Avenue :)u to 8 Sacramento CA 95834 916) 924 9600 FAX (916) 921 0100 <br /> 10Brown & 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 407-0473 Reported Jul 26, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes TRPH <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 418 1 <br /> Analyst Chlaravallotl Chlaravaliotl Chlaravallotl Chlaravallatl V Owens <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L 5 0 mg/L <br /> LCS Batch# LCS071594 LCS071594 LCS071594 LCS071594 BLK072194 <br /> Date Prepared 7/15/94 7/15/94 7/15/94 7/15/94 7/21/94 <br /> Date Analyzed- 7/15/94 7/15/94 7/15/94 7/15/94 7/21/94 <br /> Instrument 11.13 # HP-2 HP-2 HP-2 HP-2 IR-1 <br /> LCS y <br /> Recovery, 98 95 95 95 sa <br /> Control Limits: 75-125 75-125 75-125 75-125 80-120 <br /> MS/MSO <br /> Batch #: 4070449 4070449 4070449 4070449 BLK072194 <br /> Date Prepared: 7/15/94 7/15/94 7/15/94 7/15/94 7/21/94 <br /> Date Analyzed: 7/15/94 7/15/94 7/15/94 7/15/94 7/21/94 <br /> Instrument I D.#: HP-2 HP-2 HP-2 HP-2 IR-1 <br /> Matrix Spike <br /> % Recovery: 100 100 100 100 84 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 too 100 103 86 <br /> Relative% <br /> Diff erence• 00 00 00 30 24 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS 1s a control sample of known Interferent free matrix that Is analyzed using the same reagents, <br /> S 96 recovery data is used for <br /> CA L L � preparation and analytical methods employed for the samples The LC <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Craig C e and are not used to accept or reject batch results <br /> Project Manager <br /> 4070473 BRS <8> <br />