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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415)364 9233 -- <br /> 404 N Wtget Lane Walnut Creek CA 94598 (510) 988-96W FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> *PDS Services Client Project ID Unocal #0123, 1034 Central Ave , Tracy <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider OC Sample Group 7090187-190 Reported Sep 25, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Diesel <br /> Method EPA 8015M <br /> Analyst A Kemp <br /> MS/MSD <br /> Batch# B090297 <br /> Date Prepared 9/2/97 <br /> Date Analyzed 9/4/97 <br /> Instrument I D # HP-3B <br /> Cone Spiked 360 ug/L <br /> Matrix Spike <br /> % Recovery 68 <br /> • Matrix Spike <br /> Duplicate % <br /> Recovery 69 <br /> Relative % <br /> Difference 41 <br /> LCS Batch# LC8090897 <br /> Date Prepared 9/8/97 <br /> Date Analyzed 9/9/97 <br /> Instrument I D # HP-3A <br /> LCS % <br /> Recovery 69 <br /> Recovery <br /> Control Limits 60-140 <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 is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> nature 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 /> 7090187 MPD <10> <br />