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Sequoia 680 Chesapukc Drive Redwood City.CA 94063 (415) !64.9600 FAX(41$)164.9331 <br /> Analytical 1900 Eater Avenue,Suite L Concord,CA 94330 (310) 686.9600 FAX(5 10)686.96i9 <br /> i19 Striker Avenue,Suite I Sacramento,G 95814 (916) 971.9600 FAX(9161 921.O1oo <br /> Alton Geo `"" <br /> science ' "�\Cilent Project ID: Mobil 04-343/30-0136 <br /> 30-A Lindbergh Ave. Matrix: Solid <br /> Livermore,CA 94550 <br /> Attention Ron Scheele OC Sample Group 4050755-97 Reported: <br /> May 5, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> AMA—ME Benzene Toluene Ethyl Xylenes Diesel Lead <br /> Benzene <br /> EPA <br /> Method: LPA 8020 EPA 8020 EPA 8020 EPA 8020 8015 Mod. EPA 7420 <br /> Analyst: J.Fontecha J.Fontecha J. Fontecha J.Fontecha K.Wimer K.V.S. <br /> MS/MSD <br /> Batch#: 4050795 4050795 4050795 4050795 4050385 4050771 <br /> Date Prepared: 5/23/94 5/23/94 5/23/94 5/23/94 5/22/94 5/23/94 <br /> Date Analyzed: 5/23/94 5/23/94 5/23/94 5/23/94 5/23/94 5/24/94 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 HP-3B SpectrAA-20 <br /> Conc. Spiked: 0.40 mg/kg 0.40 mg/kg 0.40 mg/kg 1.2 mg/kg 300 pg/L 50 mg/kg <br /> Matrix Spike <br /> % Recovery: 98 108 110 111 99 120 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 98 108 110 109 100 113 <br /> Relative% <br /> Difference: 0.0 0.0 0.0 1.8 1.0 6.0 <br /> LCS Batch#: 2LCS052394 2LCS052394 2LCS052394 2LCS052394 BLK052294 BLK052394 <br /> Date Prepared: 5/23/94 5/23/94 5/23/94 5/23/94 5/22/94 5/23/94 <br /> Date Analyzed: 5/23/94 5/23/94 5/23/94 5/23/94 5/23/94 5/24/94 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 HP-38 SpectrAA-20 <br /> LCS % <br /> Recovery: 98 98 98 99 89 104 <br /> Recovery <br /> Control Limits: 55-145 47-149 47-155 56-140 28-122 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 /> SEQUOIA AN ICAL, #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 /> ren L. Enstrom hlterference,the LCS recove h.is to be used to validate the batch. <br /> roject Manager <br /> 4050755.ALT <15> <br />