Laserfiche WebLink
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 /> 11W <br /> OPDS Services Client Project ID Unocal #6981, 4707 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrell Crider QC Sample Group 7101203-210 Deported Oct 31, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes MTBE <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Analyst D Newcomb ❑ Newcomb D Newcomb D Newcomb A Kemp <br /> MS/MSD <br /> Batch# 7101208 7101208 7101208 7101208 7100659 <br /> Date Prepared 10/27/97 10/27/97 10/27/97 10/27/97 10/24/97 <br /> Date Analyzed 10/27/97 10/27/97 10/27/97 10/27/97 10/24/97 <br /> Instrument I D # HP 4 HP-4 HP-4 HP-4 GC/MS-2 <br /> Conc. Spiked 20Ng/L 20ug/L 20 jig/L 60yg/L 50pg/L <br /> Matrix Spike <br /> % Recovery 90 95 90 95 123 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 80 85 so 83 125 <br /> Relative % <br /> Difference 12 11 12 13 00 <br /> LCS Batch#- 4LC8102797 4LCS102797 4LCS102797 4LC8102797 LCS102997 <br /> Date Prepared 10/27/97 10/27/97 10/27/97 10/27/97 10/29/97 <br /> Date Analyzed 10/27/97 10/27/97 10/27/97 10/27/97 10/29/97 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 GD/MS 2 <br /> LCS % <br /> Recovery 80 85 80 85 118 <br /> Recovery <br /> Control Limits 70-130 70-130 70-130 70-130 65-135 <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 /> Ognature 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 /> 7101203 MPD <13> <br /> n� <br />