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Sequoia <br />'0 Chtake Drive <br />Redwood City, CA 94063 (650) 364-9600 FAX(650)364-9233 <br />J uoia <br />404 N. W iget Lane <br />Walnut Creek. CA 94598 (925) 988-9600 FAX(925)988-9673 <br />Analytical <br />819 Striker Avenue, Suite 8 Sacramento, CA 95834 1167) 921-9600 FAX (916) 921-0100 <br />1455 McDowell Blvd. North, Ste. D Petaluma. CA 94954 ) 792-1865 FAX(707)792-0342 <br />Gettier-Ryan- Dublin <br />Client Project ID. . <br />Chevron #9-3232, Stockton <br />6747 Sierra Court, Suite J <br />Matrix: <br />Solid <br />Dublin, CA 94568 <br />HP -5 <br />HP -5 <br />Attention: Greg Gurss <br />QC Sample Group: 9031105-115 Reported: Mar 17, 199 <br />ANALYTE Benzene <br />Toluene Ethyl Xylenes MTBE <br />3/12/99 <br />Benzene <br />Method: EPA 8020 <br />EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br />Analyst: C. Westwater <br />C. Westwater C. Westwater C. Westwater N. Nelson <br />MS/MSD <br />Batch#: 9030972 9030972 9030972 9030972 9031092 <br />Date Prepared: <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />31/112/99 <br />Date Analyzed: <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/14/99 <br />Instrument I.D.#: <br />HP -5 <br />HP -5 <br />HP -5 <br />HP -5 <br />GC/MS-2 <br />Conc. Spiked: <br />0.80 mg/kg <br />0.80 mg/kg <br />0.80 mg/kg <br />2.4 mg/kg <br />2500,ug/kg <br />Matrix Spike <br />%• Recovery: <br />109 <br />111 <br />113 <br />117 <br />113 <br />Matrix Spike <br />Duplicate % <br />Recovery: <br />109 <br />111 <br />111 <br />117 <br />113 <br />Relative % <br />Difference: <br />............................................................................................................................................................................................. <br />.............................................................................................................................................................................................................................................................................................. <br />............................................................................................................................................................................................................................................................................................... <br />............................................................................................................................................................................................................................................................................................... <br />............................................................................................................................................................................................................................................................................................... <br />.......................................................................................................................................................................................................................................................... <br />0.0 <br />_..............................................._.................................................................................._......._.................................................--....... <br />0.0 <br />1.1 <br />0.0 <br />0.0 <br />...................................................:............... <br />.......... <br />LCS Batch#: <br />5LCS031299 <br />5LCS031299 <br />5LCS031299 <br />5LCS031299 <br />LCS031299 <br />Date Prepared: <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />Date Analyzed: <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/14/99 <br />Instrument I.D.#: <br />HP -5 <br />HP -5 <br />HP -5 <br />HP -5 <br />GC/MS-2 <br />LCS % <br />Recovery: <br />111 <br />113 <br />110 <br />113 <br />100 <br />Recovery <br />Control Limits: 50-150 50-150 50-150 50-150 70-130 <br />SEQUOIA ANALYTICAL, #1271 <br />ytk� gt�� <br />ui' nne Fegley <br />Project Manager <br />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 matrix spike is an aliquot of sample <br />fortified with known quantities of specific compounds and subjected to the entire analytical procedure. if <br />the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br />interference, the LCS recovery is to be used to validate the batch. <br />9031105.GET <14> <br />