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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Anaytiea 1900 Bates Avenue,Suite L Concord,CA 94520 (510) 686 9600 FAX (510)686 9689 <br /> 819 Sinker Avenue Suite a Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> RESNA YCllent Project ID 150047 01, Elkholm Property <br /> 1710 Main Street Matrix Water <br /> Escalon, CA 95320 <br /> Attention John Lane QC Sample Group 4CJ0201 Reported Apr 13, 1994 <br /> 7 ' <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 P Madden P Madden P Madden P Madden <br /> MS/MSD <br /> Batch# 4040088MS 4040088MS 4040088MS 4040088MS <br /> Date Prepared- 4/8/94 4/8/94 4/8/94 4/8/94 <br /> Date Analyzed 4/8/94 4/8/94 4/8/94 4/8/94 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Conc Spiked: 10Ng/L 10jug/L 10pg/L 20ug/L <br /> Matrix Spike <br /> % Recovery: 97 99 93 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 97 98 91 98 <br /> Relative% <br /> Difference- 00 10 22 20 <br /> 4 , <br /> LCS Batch# M13040894 MB040894 MB040894 MB040894 <br /> Date Prepared: 4/8/94 4/8/94 4/8/94 4/8/94 <br /> Date Analyzed: 4/8/94 4/8/94 4/8/94 4/8/94 <br /> Instrument I D #: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery 90 90 91 98 <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 /> LAP #1894 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 /> (U�f f 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 /> Vickie Tague Clark <br /> Project Manager 4CJ0201 WAT <3> <br />