Laserfiche WebLink
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 9600 FAX(510) 686 9689 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> *1pUS Services Client Project Ib Unocal #6981, 4707 Pacific Ave, Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Group 4071480-89 Reported Aug 10, 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 J Fontecha J Fontecha J Fontecha J Fontecha <br /> MS/MSD <br /> Batch# 4081480 4081480 4081480 4081480 <br /> Date Prepared 8/8/94 8/8/94 8/8/94 8/8/94 <br /> Date Analyzed 8/8/94 8/8/94 8/8/94 8/8/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20 pg/L 20 ftg/L 20 Ng/L 60 ug/L <br /> Matrix Spike <br /> %Recovery 90 100 100 103 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 90 100 105 105 <br /> Relative % <br /> Difference 00 00 49 1 9 <br /> LCS Batch# 1 LCS080894 1 LCS080894 1 LCS080894 1 LCS080894 <br /> Date Prepared 8/8/94 8/8/94 8/8/94 8/8/94 <br /> Date Analyzed 8/8/94 8/8/94 8/8/94 8/8/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 98 100 102 103 <br /> Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #1271 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 /> Signature on File 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 /> Alan B Kemp <br /> Project Manager <br /> 4071480 MPD <5> <br />