Laserfiche WebLink
Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 41) 404 N Wiget lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> q1W Analytical 819 Striker Avenue Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> OPOS Services Client Project Ib 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 Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst K Nill K N111 K Nill K Nill <br /> MS/MSD <br /> Batch# 7090189 7090189 7090189 7090189 <br /> Date Prepared 9/10/97 9/10/97 9/10/97 9/10/97 <br /> Date Analyzed 9/10/97 9/10/97 9/10/97 9/10/97 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Conc Spiked 20lrg/L 20l.g/L 20,Ug/L 60pg/L <br /> Matrix Spike <br /> % Recovery 95 95 95 97 <br /> • Matrix Spike <br /> Duplicate% <br /> Recovery 90 95 95 95 <br /> Relative% <br /> Difference 5 4 00 00 1 7 <br /> LCS Batch# 5LCS091097 5LCS091097 5LCS091097 5LCS091097 <br /> Date Prepared 9/10/97 9/10/97 9/10/97 9/10/97 <br /> Date Analyzed 9/10/97 9/10/97 9/10/97 9/10/97 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> LCS % <br /> Recovery 100 100 95 102 <br /> % Recovery <br /> Control Limits 70-130 70-130 70 130 70-130 <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 1s to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 7090187 MPD <9> <br />