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' Sequoia e u i Y 80 Chesapeake Drive Redwood Cary CA 94063 415) 364-9600 FAX(415) 364 9233 <br /> 404 N Wig,,lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> X117 Analytical 819 Striker Avenue,Suite B Sacramento CA 95834 (916) 921-96DO FAX(916)921 0100 <br />' MPDS Services Client Project ib Unocal #0123, 11034 Central Ave,Tracy <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkanan QC Sample Group 5060155-57 Reported Jun 19, 1995 ' <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Cadmium Chromium Lead Nickel Zinc <br /> Method EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 <br />' Analyst L Huang L Huang L Huang L Huang L Huang <br /> MS/MSD <br /> Batch# 5050044 5060044 5060044 5060044 5060044 <br />' Date Prepared. 6/13/95 6/13/95 6/13/95 6/13/95 6/13/95 <br /> Date Analyzed 6/14/95 6/14/95 6/14/95 6/14/95 6/14/95 <br />' Instrument I D # MV3 MV3 MV3 MV3 MV3 <br /> Cone Spiked 1 0 mg/L 1 0 mg/L 1 0 mg/L 1 0 mg/L 1 0 mg/L <br /> Matrix Spike <br /> % Recovery 96 94 94 91 105 <br /> Matrix Spike <br />' Duplicate % <br /> Recovery 98 94 94 91 105 <br /> Relative% <br />' Difference 21 00 00 00 00 _ <br /> . ♦ , r r L J ^ n J Y i ` <br />' LCS Batch# BLK061395 BLKD61395 BLK061395 BLK061395 BLK061395 <br />' Date Prepared 6/13/95 6/13/95 6/13/95 6/13/95 6/13/95 <br /> Date Analyzed 6/14/95 6/14/95 6/14/95 6/14/95 6/14/95 <br /> Instrument I D # MV3 MV3 MV3 MV3 MV3 <br />' LCS % <br /> Recovery, 97 99 100 100 100 <br />' % Recovery <br /> Control Limits 75-125 75-125 75-125 75-125 75-125 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> EQUCIA 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 /> PISIgnature on File the recovery of analytes from the matrix spike does not fall within specified control lirnits due to matrix <br /> Interference,the LCS recovery is to be used to validate the batch <br /> Alan B Kemp _ <br /> Project Manager <br /> - — 5050155 MPD <11> <br /> r�i` -- <br />