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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue.Sulte 8 Sacramento.CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd.North,Ste.D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ....... ........ ..... <br /> '.. �Qttier-Ryan--Dublin �Ilent Project ID Tosco #11195, Lathrop <br /> :-047 Sierra Court, Suite J Matrix: Liquid <br /> Dublin, CA 94568 <br /> >'Attention: Doug Lee OC Sample Group: 812-1495 Reported: Jan 5, 1999;' <br /> X. <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloroethene Trichloroethene Benzene Toluene Chloro- Mercury <br /> benzene <br /> Method: EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 7470 <br /> Analyst: N. Nelson N. Nelson N. Nelson N. Nelson N. Nelson T. Le <br /> MS/MSD <br /> Batch#: 8120951 8120951 8120951 8120951 8120951 8121590 <br /> Date Prepared: 12/17/98 12/17/98 12/17/98 12/17/98 12/17/98 12/21/98 <br /> Date Analyzed: 12/17/98 12/17/98 12/17/98 12/17/98 12/17/98 12/22/98 <br /> Instrument I.D.#: GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 MV-1 <br /> Conc. Spiked: 50 pg/L 50 ug/L 50 ug/L 50 pg/L 50 pg/L 0.0020 mg/L <br /> Matrix Spike <br /> % Recovery: 94 96 102 98 92 105 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 100 104 108 104 98 105 <br /> Relative % <br /> Difference: 6.2 8.0 5.7 5.9 6,3 0.0 <br /> LCS Batch#: LCS121898 LCS121898 LCS121898 LCS121898 LCS121898 LCS122198 <br /> Date Prepared: 12/18/98 12/18/98 12/18/98 12/18/98 12/18/98 12/21/98 <br /> Date Analyzed: 12/18/98 12/18/98 12/18/98 12/18/98 12/18/98 12/22/98 <br /> Instrument I.D.#: GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 MV-1 <br /> LCS % <br /> Recovery: 94 98 102 96 92 125 <br /> % ecovery <br /> Control Limits: 65-135 70-130 70-130 70-130 70-130 75-125 <br /> Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> S ANALYTICAL, #1271 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 /> Julianne Feg ey <br /> Project Man ge <br /> 8121495.GE-r <6> <br /> 6 <br /> 4 <br />