Laserfiche WebLink
Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 00 c <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 <br /> �„ (916) 921 9600 FAX(916}92l 0100 <br /> OPDS 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 7030493-496 Reported Mar 19, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb D Sharma <br /> MS/MSD <br /> Batch# 7030495 7030495 7030495 7030495 BLK031097 <br /> Date Prepared 3/10/97 3/10/97 3/10/97 3/10/97 3/10/97 <br /> Date Analyzed 3/10/97 3/10/97 3/10/97 3/10/97 3/13/97 <br /> Instrument I D # HP-2 HP 2 HP 2 HP-2 HP 3A <br /> Conc Spiked 20pg/L 20lig/L 20pg/L 60pg/L 300 pg/L <br /> Matrix Spike <br /> % Recovery 90 110 105 102 103 <br /> • Matrix Spike <br /> Duplicate% <br /> Recovery 90 105 95 100 93 <br /> Relative% <br /> Difference 00 47 10 1 7 10 <br /> LCS Batch# 2LCS031097 2LCS031097 2LCS031097 2LCS031097 LCS031097 <br /> Date Prepared 3/10/97 3/10/97 3/10/97 3/10/97 3/10/97 <br /> Date Analyzed 3/10/97 3/10/97 3/10/97 3/10/97 3/13/97 <br /> Instrument I D # HP-2 HP-2 HP 2 HP-2 HP-3A <br /> LCS % <br /> Recovery 95 115 110 108 93 <br /> Recovery <br /> Control Limits 60-140 60-140 60-140 60-140 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 /> 101 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 /> 7030493 MPD <9> <br />