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SEQUOIA ANALYTICAL <br /> Chesapeake680 Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> RESNA Client Project ID 150047 01, Ekholm Property <br /> 1710 Main Street Matrix Soil <br /> Escalon, CA 95320 <br /> Attention John Lane QC Sample Group 4A40301 Reported Jan 25, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Beryllium Cadmium Chromium Nickel <br /> Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Analyst M Mistry M Mistry M Mistry M Mistry <br /> MS/MSD <br /> Batch# 4A40301 4A40301 4A40301 4A40301 <br /> Date Prepared 1/11/94 1/11/94 1/11/94 1/11/94 <br /> Date Analyzed 1/12/94 1/12/94 1/12/94 1/12/94 <br /> Instrument I D # MTJA-2 MTJA 2 MTJA-2 MTJA-2 <br /> Cone Spiked 100 mg/kg 100 mg/kg 100 mg/kg 100 mg/kg <br /> Matrix Spike <br /> . % Recovery: 95 89 94 94 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 95 90 95 95 <br /> Relative% <br /> Difference 00 1 1 1 1 1 1 <br /> LCS Batch# BLK011194 SLK011194 BLK011194 BLK011194 <br /> Date Prepared 1/11/94 1/11/94 1/11/94 1/11/94 <br /> Date Analyzed 1/12/44 1/12/94 1/12/94 1/12/94 <br /> Instrument I D #• MTJA-2 MTJA-2 MTJA-2 MTJA 2 <br /> LCS % <br /> Recovery- 100 100 97 100 <br /> % Recovery <br /> Control Limits 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 /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> �y fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> I J 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 /> Vi11: <br /> Project Manager 4A40301 WAT <a> <br />