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QUALITY CONTROL DATA REPORT <br />ANATYTE <br />2,4-Dinitro- Penta - <br />Acenaphthene <br />4-Nitrophenol toluene chlorophenol Pyrene <br />Method: <br />EPA 8270 <br />EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br />Analyst: <br />L. Diaz <br />L. Diaz L. Diaz L. Diaz L. Diaz <br />Concentration <br />Spiked: <br />100 pg/L <br />150 pg/L 100 pg/L 150 pg/L 100 pg/L <br />LCS/LCSD <br />Batch #: <br />BLK062899A <br />BLK062899A BLK062899A BLK062899A BLK062899A <br />Date Prepared: <br />06/28/99 <br />06/28/99 06/28/99 06/28/99 06/28/99 <br />Date Analyzed: <br />06/29/99 <br />06/29/99 06/29/99 06/29/99 06/29/99 <br />Instrument I.D.#: <br />GUMS 1 <br />GC/MS 1 GC/MS 1 GUMS 1 GUMS 1 <br />LCS <br />% Recovery: <br />60 <br />26 67 73 73 <br />LCSD <br />% Recovery: <br />60 <br />28 69 73 68 <br />Relative % <br />Difference: <br />0.0 <br />7.4 2.9 0.0 7.1 <br />Control Limits: <br />46-118% <br />10-80% 24-96% 9-103% 26-127% <br />SEQUOIA ANALYTICAL <br />Please Note: <br />< , <br />/ <br />The LCS is a control sample of known, interferent free matrix that is analyzed using the same reagents, <br />for the The LCS % recovery data is used for <br />C <br />preparation and analytical methods employed samples. <br />validation of sample batch results. Due to matrix effects, the QC limits for MS/MSD's are advisory only <br />Sandra R. Hanson <br />and are not used to accept or reject batch results. <br />Project Manager/Sacramento Labor <br />age of 2 <br />S906400.KLF <18> <br />