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Sequoia 680 Chesapeake Dnvc Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord,CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> WAIF Analytical 819 Stinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> RESNA Client Project ID 150047 01, Ekholm Property x v <br /> 1710 Main Street Matrix Liquid <br /> Escalon, CA 95320 <br /> Attention John Lane OC Sample Group 9409078-01-4 Reported Sep 15, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst N Zahedi N Zahedi N Zahedi N Zahedi <br /> MS/MSD <br /> Batch,# 4090042 4090042 4090042 4090042 <br /> Date Prepared: 9/7/94 9/7/94 9/7/94 9/7/94 <br /> Date Analyzed: 9/7/94 9/7/94 9/7/94 9/7/94 <br /> Instrument I.D #. GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Conc Spiked: 10Ng/L 10pg/L 10lrg/L 30ug/L <br /> Matrix Spike i <br />. %Recovery: 96 102 97 97 <br /> Matrix Sptke <br /> Duplicate% <br /> Recovery: 92 93 92 92 <br /> Relative% <br /> Difference: 4 3 92 53 5 3 <br /> s 1 v.r. .r vvx virr nr r,}i},ti♦ r�tVi:,[orti. r ,r,., v 1 , r n r,. r, r ..,.v. Y s~L c.. AV ... ,� A} a�,v 4ror•,<' rjrw�g}#+^')pOt»,A'f <br /> ,rr ri rir` r rM1}rry r +wmv rrrry sr.Lv3Nn-n7FisJYi�b.S�rr,;}ti <br /> LCS Batch#* LCSM794 LCS090794 LCSM794 LCS090794 <br /> Date Prepared: 9/7/94 9/7/94 9/7/94 9/7/94 <br /> Date Analyzed. 9/7/94 9/7/94 9/7/94 9/7/94 <br /> Instrument I D #: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS% <br /> Recovery: 99 100 103 100 <br /> % Recovery <br /> Control Limits: 71-133 72-128 72-130 71-120 <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br />. ELAP#2000 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 If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> riterference,the LCS recovery 1s to be used to validate the batch <br /> Vickie Tague Clark <br /> Project Manager 9409078 WAT <2> <br />