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Sequoia <br />680 Cheake Drive Redwood City, CA 94063 <br />0) 364-9600 <br />FAX (650) 364-9233 <br />Method: EPA 8020 <br />404 N. Wiget Lane Walnut Creek, CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />Analytical <br />819 Striker Avenue, Suite 8 Sacramento, CA 95834 <br />1455 McDowell Blvd. North, Ste. D Petaluma. CA 94954 <br />(916) 921-9600 <br />(707) 792-1865 <br />FAX (916) 921-0100 <br />FAX (707) 792-0342 <br />...., . .. _ .: .. .. >;::;R: <: <;;;i:;i: •::i i2:::iSi ai:;:: aSi::;;.';.;::i;:::J::? <br />Gettler-Ryan - Dublin <br />i;ii :;;:;' ;:: ................;i;:;::;: ...... ..............i?i i%'<'::>:ii•i.i 5i i'i. <br />Client f'rojectID: Chevron �#9-3232, Stoc 'n" �� <br />3/12/99 <br />3/12/99 <br />6747 Sierra Court, Suite J <br />Matrix: Solid <br />Date Analyzed: <br />3/15/99 <br />Dublin, CA 94568 <br />3/15/99 <br />3/15/99 <br />3/12/99 <br />Attention: Greg Gurss <br />QC Sample Group: 9031092-104 <br />Reported: <br />Mar 17, 19� <br />ANALYTE Benzene <br />Toluene Ethyl Xylenes Diesel <br />4LCS031299 <br />Benzene <br />Method: EPA 8020 <br />EPA 8020 EPA 8020 EPA 8020 EPA 8015 M. <br />Analyst: J. Minkel <br />J. Minkel J. Minkel J. Minkel K. Grubb <br />MS/MSD <br />4LCS031299 <br />4LCS031299 <br />4LCS031299 <br />4LCS031299 <br />LCS031299 <br />Batch#: <br />9031120 <br />9031120 <br />9031120 <br />9031120 <br />9031102 <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 />3/15/99 <br />3/15/99 <br />3/15/99 <br />3/15/99 <br />3/12/99 <br />Instrument I.D.#: <br />HP -4 <br />HP -4 <br />HP -4 <br />HP -4 <br />HP -3B <br />Conc. Spiked: <br />0.80 mg/kg <br />0.80 mg/kg <br />0.80 mg/kg <br />2.4 mg/kg <br />15 mg/kg <br />Matrix Spike <br />Recovery: <br />101 <br />88 <br />91 <br />100 <br />80 <br />Matrix Spike <br />Duplicate % <br />Recovery: <br />100 <br />89 <br />91 <br />100 <br />73 <br />Relative % <br />Difference: <br />1.2 <br />1.4 <br />0.0 <br />0.0 <br />8.7 <br />LCS Batch#: <br />4LCS031299 <br />4LCS031299 <br />4LCS031299 <br />4LCS031299 <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 />3/15/99 <br />3/15/99 <br />3/15/99 <br />3/15/99 <br />3/12/99 <br />Instrument I.D.#: <br />HP -4 <br />HP -4 <br />HP -4 <br />HP -4 <br />HP -3A <br />LCS % <br />Recovery: <br />99 <br />85 <br />88 <br />96 <br />87 <br />% Recovery <br />Control Limits: 50-150 50-150 50-150 50-150 60-140 <br />SEQUOIA ANALYTICAL, #1271 <br />AY7 <br />ianne 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. K <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 />9031092.GET <25> <br />