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Sequoia <br />Analytical <br />680 Ches'a'peake Drive Redwood City, CA 94063 <br />404 N. Wiget Lane Walnut Creek, CA 94598 <br />819 Striker Avenue, Suite 8 Sacramento, CA 95834 <br />1455 McDowell Blvd. North, Ste. D Petaluma CA 94954 <br />650) 364-9600 <br />(925) 988-9600 <br />(916) 921-9600 <br />(707) 792-1865 <br />FAX (650) 364-9233 <br />FAX(925)988-9673 <br />FAX (916) 921-0100 <br />FAX(707)792-0342 <br />Gettler-Ryan - Dublin <br />Client Project ID Chevron #9-3232, Stockton <br />Analyst: N. Nelson N. Nelson <br />N. Nelson N. Nelson N. Nelson N. Nelson <br />6747 Sierra Court, Suite J <br />Matrix: Solid <br />Conc. Spiked: <br />2500 Ng/kg <br />Dublin, CA 94568 <br />3/15/99 <br />% Recovery: <br />72 <br />Attention: Greg Gurss <br />QC Sample Group: 9031116-129 <br />Reported: Mar 16, 19 <br />QUALITY CONTROL DATA REPORT <br />ANALYTE 1,1-Dichloroethene Trichloroethene <br />Benzene Toluene Chloro- MTBE <br />Batch#: <br />benzene <br />Method: EPA 8240 EPA 8240 <br />EPA 8240 EPA 8240 EPA 8240 EPA 8260 <br />Analyst: N. Nelson N. Nelson <br />N. Nelson N. Nelson N. Nelson N. Nelson <br />MS/MSD <br />LCS031299B <br />Batch#: <br />9031125 <br />Date Prepared: <br />3/12/99 <br />Date Analyzed: <br />3/15/99 <br />Instrument I.D.#: <br />GC/Ms 2 <br />Conc. Spiked: <br />2500 Ng/kg <br />Matrix Spike <br />3/15/99 <br />% Recovery: <br />72 <br />Matrix Spike <br />GC/MS 2 <br />Duplicate % <br />GC/MS-2 <br />Recovery: <br />76 <br />Relative % <br />2500 Ng/kg <br />Difference: <br />5.4 <br />LCS Batch#: <br />LCS031299B <br />Date Prepared: <br />3/12/99 <br />Date Analyzed: <br />3/15/99 <br />Instrument I.D.#: <br />GC/Ms 2 <br />LCS % <br />3/12/99 <br />Recovery: <br />68 <br />9031125 <br />9031125 <br />9031125 <br />9031125 <br />9031116 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/15/99 <br />3/15/99 <br />3/15/99 <br />3/15/99 <br />3/15/99 <br />GC/MS 2 <br />GC/MS 2 <br />GC/MS 2 <br />GC/MS 2 <br />GC/MS-2 <br />2500 Ng/kg <br />2500 µg/kg <br />2500 µg/kg <br />2500 Ng/kg <br />2500 Ng/kg <br />96 <br />100 <br />96 <br />96 <br />92 <br />100 <br />104 <br />104 <br />100 <br />104 <br />4.1 <br />3.9 <br />8.0 <br />4.1 <br />12 <br />LCS031299B <br />LCS031299B <br />LCS031299B <br />LCS031299B <br />LCS031299B <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/15/99 <br />3/15/99 <br />3/15/99 <br />3/15/99 <br />3/12/99 <br />GC/MS 2 <br />GC/MS 2 <br />GC/MS 2 <br />GC/MS 2 <br />GC/MS-2 <br />100 <br />104 <br />104 <br />100 <br />92 <br />% Recovery <br />Control Limits: 65-135 70-130 70-130 70-130 70-130 70-130 <br />SEQUOIA ANALYTICAL, #1271 <br />4zvh <br />J lianne Fegley <br />roject 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 />9031116.GET <32> <br />