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Sequoia 6110 Chtupcakt Dnve Reeroo/Gtr,CA 94061 (413) 164.600 FAX(41s) 164.9311 <br /> Analytical 19!190°Ser1'4`">< AAn' '.t'"1t t. comm k cA %$20 (slo) 616.%oo FAX(s a)bei-9419 <br /> rr renue�Suue 1 SaMmento,CA 93114 (910) 921-96W FAX(0 16)921.0too <br /> Alton Geoscience 'Client Prof ect ID: Mobil 04.343/30-0138.15 <br /> 30-A Undbergh Ave. Matrix: Uquld <br /> Livermore,CA 94550 <br /> :1,Attentlon: Kevin Keenan QC Sample Group: 4050255 <br /> Reported: May 1 t, <br /> .. .� . .. .. .:.:.... . ... ,.., 1994 <br /> QUALITY CONTROL DATA REPORT <br /> Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> Method; EPA 8020 EPA 8020 EPA <br /> Anal ri. EPA solo EPA ao2o sols Mod, <br /> y ' J.Fontecha J.Fontecha J.Fontecha L Fontecha K.Wimer <br /> MS/MSD <br /> Batch#: 4441417 4041417 4041417 4041417 BLKD50994 <br /> Date Prepared: 5/10/94 5/14/94 5/10/94 5/10/94 5/9/94 <br /> Date Analyzed: 5/10/94 5/10/94 5/10/94 5/10/94 5/10/94 <br /> Instrument I.D.#: HP-2 HP-2 <br /> Conc.Spiked: 201p/t, 20 HP-2 HP-2 HP-3A <br /> N9/L 20 N9/L 60 PO/L 3W pg/L <br /> Matrix Spike <br /> %Recovery: 8o 95 100 102 <br /> 88 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 75 90 <br /> 95 98 91 <br /> Relative% <br /> Difference: 8.5 5.4 5.1 4.0 <br /> 3.7 <br /> .nv+.x..-.vv.t...s.,n....:...s.............v......• :.:il`r'tiriiCv{vim'. ,rt F <br /> LCS Batch#: ILCS051094 iLCS051094 11-CS051094 1LCSM1094 BLK05pg94 <br /> Date Prepared: 5/10/94 5/10/94 5/10/94 5/10/94 5/9/94 <br /> Date Analyzed: 5/10/94 5/10/94 5/10/94 5/10/94 94 <br /> 100 <br /> Instrument I.D.#: HP-2 HP-2 5/10/94 <br /> / <br /> HP-2 W-2 HP-A <br /> LCS% <br /> Recovery: 98 101 <br /> 104 105 88 <br /> ecovery <br /> Control Limits: 71-133 72-128 72-130 71-120 <br /> 28-122 <br /> Please Mete: <br /> s a <br /> SEQUOIA YTICAL,#1271preparation,eland analytical methods trol eofk employed <br /> matrix that is analyzed using the same reagents, <br /> P Yed samples. The matrix spike is an allquot of sample <br /> fortified vAth known quantities of specific compounds and subjected to the entire analydca!procedure. I <br /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> ren L Enstrom interference,the LCS recave is to be used to validate the batch. <br /> Project Manager <br /> 4OW255 ALT <5> <br />