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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> OPOS Services Client project lid Unocal #5421, 7303 Pacific Ave, Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 5120248-254 Reported Dec 19, 1995 <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 Z T Z T Z T Z T <br /> MS/MSD <br /> Batch#, 5120313 5120313 5120313 5120313 <br /> Date Prepared. 12/15/95 12/15/95 12/15/95 12/15/95 <br /> Date Analyzed: 12/15/95 12/15/95 12/15/95 12/15/95 <br /> Instrument I D #: HP-2 HP-2 HP-2 HP-2 <br /> Conc. Spiked: 10 ug/L 10 pg/L 10 pg/L 30 ug/L <br /> Matrix Spike <br /> %Recovery 106 86 91 81 <br /> • Matrix Spike <br /> Duplicate% <br /> Recovery 125 114 121 83 <br /> Relative% <br /> Difference: 17 28 20 24 <br /> LCS Batch#' LCS121495 LCS121495 LCS121495 LCS121495 <br /> Date Prepared. 12/15/95 12/15/95 12/15/95 12/15/95 <br /> Date Analyzed: 12/15/95 12/15/95 12/15/95 12/15/95 <br /> Instrument 1.0 # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 117 108 98 86 <br /> Recovery <br /> Control Limits- 71-133 72-128 72-130 71-120 <br /> Please Note <br /> The LCS 1s a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #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 /> Oignature 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 /> 5120248 MPD <6> <br />