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i <br />Sequoia <br />Analytical <br />le nfelder' Stockton<>.< >.......................... <br />2825 East Myrtle St. <br />Stockton, CA 95205 <br />Attention: Tony Martin <br />ANALYTE <br />Phenol <br />Method: EPA 8270 <br />Analyst: L. Diaz <br />Concentration <br />Spiked: 150 pg/L <br />LCS/LCSD <br />Batch #: BLK062899A <br />Date Prepared: 06/28/99 <br />Date Analyzed: 06/29/99 <br />Instrument I.D.#: GUMS 1 <br />LCS <br />% Recovery: 27 <br />LCSD <br />% Recovery: 27 <br />Relative % <br />Difference: 2.5 <br />Control Limits: 12-110% <br />Matrix: SoilMater <br />QC Sample Group: S906400 <br />EPA 8270 <br />L. Diaz <br />150 pg/L <br />benzene <br />EPA 8270 <br />L. Diaz <br />100 Ng/L <br />DR, <br />EPA 8270 <br />L. Diaz <br />100 pg/L <br />benzene <br />EPA 8270 <br />L. Diaz <br />100 pg/L <br />819 Striker Avenue, Suite 8 <br />Sacramento, CA 95834 <br />(916) 921-9600 <br />FAX (916) 921-0100 <br />EPA 8270 <br />L. Diaz <br />150 pg/L <br />BLK062899A <br />BLK062899A <br />BLK062899A <br />BLK062899A <br />BLK062899A <br />06/28/99 <br />06/28/99 <br />06/28/99 <br />06/28/99 <br />06/28/99 <br />06/29/99 <br />06/29/99 <br />06/29/99 <br />06/29/99 <br />06/29/99 <br />GC/MS 1 <br />GC/MS 1 <br />GUMS 1 <br />GUMS 1 <br />GUMS 1 <br />66 <br />62 <br />75 <br />69 <br />64 <br />67 <br />63 <br />76 <br />70 <br />64 <br />1.0 <br />1.6 <br />1.3 <br />1.4 <br />0.0 <br />27-123% <br />36-97% <br />41-116% <br />39-98% <br />23-97% <br />Jul 13, 1999 <br />Please Note: <br />SEQUOIA ANALYTICAL 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 />y �iL validation of sample batch results. Due to matrix effects, the QC limits for MS/MSD's are advisory only <br />tCi <br />and are not used to accept or reject batch results. <br />Sandra R. Hanson <br />Project Manager/Sacramento Laboratory Page 1 of 2 <br />S906400.KLF <17> <br />