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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415) 364-9600 - FAX(415) 364-9233 <br /> RESNA Client Project ID 150047 01, Ekholm Prop <br /> 1710 Main Street Matrix Soil I <br /> Escalon, CA 95320 <br /> Attention John Lane OC Sample Group 4A20801 Reported Jan 25, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Beryllium Cadmium Chromium Nickel Mercury <br /> Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 7471 <br /> Analyst C Medefesser C Medefesser C Medefesser C Medefesser J Martinez <br /> MS/MSD <br /> Batch#- 4A25601 4A25601 4A25601 4A25601 4A38101 <br /> Date Prepared 1/10/94 1/10/94 1/10/94 1/10/94 1/13/94 <br /> Date Analyzed 1/10/94 1/10/94 1/10/94 1/10/94 1/14/94 <br /> Instrument I D # MTJA-2 MTJA-2 MTJA-2 MTJA 2 MPE-2 <br /> Conc Spiked 100 mg/kg 100 mg/kg 100 mg/kg 100 mg/kg 1 0 mg/kg <br /> Matrix Spike <br /> % Recovery 94 93 93 93 86 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 96 95 95 94 97 <br /> Relative % <br /> Difference 21 21 21 11 12 <br /> LCS Batch#. BLK011094 BLK011094 BLK011094 BLK011094 CCV011494 <br /> Date Prepared 1/10/94 1/10/94 1/10/94 1/10/94 1/14/94 <br /> Date Analyzed 1/10/94 1/10/94 1/10/94 1/10/94 1/14/94 <br /> Instrument I D # MTJA-2 MTJA-2 MTJA-2 MTJA-2 MPE-2 <br /> LCS % <br /> Recovery 95 94 97 96 93 <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 /> 0 SEQUOIA ANALYTICAL 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 It <br /> ITIage <br /> 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 /> Vickie <br /> Project Manager 4A20801 wAT <7> <br />