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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Analytical 1900 Bates Avenue Suite L Concord,CA 94520 (510) 686%00 FAX(510)686-9689 <br /> $19 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 %00 FAX(916)921 0100 <br /> 4 rc~ <br /> P1'RESNA <br /> Chert Project ID 150087 01, Tracy Public Schools <br /> 710 Main Street Matrix Liquid <br /> scalon, CA 95320 <br /> ' <br /> 'Attention John Lane QC Sample Group 4EA2804-8 Reported May 26, 1994"t} <br /> Fv tYY 4 r v <br /> ' QUALITY CONTROL DATA REPORT <br /> ANALYTE Lead <br /> I <br /> Method: EPA 239 2 <br /> ' Analyst: J Martinez <br /> MS/MSD <br /> ' Batch#: 4EC9501 <br /> Date Prepared: 5/23/94 <br /> Date Analyzed. 5/24/94 <br /> Instrument I.D.#: MTJA 1 <br /> Conc. Spiked' 0 050 mg/L <br /> Matrix Spike <br /> b % Recovery- 77 <br /> Matrix Spike - <br /> ' Duplicate% <br /> Recovery: 88 <br /> Relative% <br /> ' Difference. 13 <br /> v rw♦ 1{ 4} �~ .v ++ } + ' .. y 4L'n x±� nn'.'r <br /> + v rr v Y v y n v +v v + + ...vr r r r t r +*Sr , ♦<,nv..e+� } ,+♦ "i# <br /> ' LCS Batch# BLKM2394 <br /> ' Date Prepared: 5/23/94 <br /> Date Analyzed: 5/24/94 <br /> Instrument I.D.#: MTJA-1 <br /> ' LCS% <br /> Recovery 104 <br /> ' % ReEovery <br /> Control Limits- 75-125 <br /> ' Please Note <br /> The LCS is a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s an aliquot of sample <br /> _ fortified with known quantities of specific compounds and subjected to the entire analytical procedure H <br /> tC&JL, the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> 11 iii interference,the LCS recovery is to be used to validate the batch <br /> Vickie Tague Clark <br /> ' Project Manager 4EA2801 WAT <4> <br />