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(D— 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 Sod <br /> Escalon, CA 95320 <br /> Attention John Lane OC Sample Group 4A20801 Reported Jan 25, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-0cchloro- Trichloro- Chloro- Benzene Toluene Chloro- <br /> ethene ethene benzene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst D George D George D George D George D George D George <br /> MS/MSD <br /> Batch# 4A66501 4A66501 4A66501 4A66501 4AB6501 4A66501 <br /> Date Prepared 1/18/94 1/18/94 1/18/94 1/18/94 1/18/94 1/18/94 <br /> Date Analyzed 1/18/94 1/18/94 1/18/94 1/18/94 1/18/94 1/18/94 <br /> Instrument I D # HP15 HP15 HP15 HP15 HP15 HP15 <br /> Conc. Spiked 25 pg/kg 25 erg/kg 25 pg/kg 25 pg/kg 25 pg/kg 25 Ng/kg <br /> Matrix Spike <br /> % Recovery 116 100 104 124 116 112 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 104 92 112 120 116 128 <br /> Relative% <br /> Difference 11 83 74 33 00 13 <br /> LCS Batch# - - - - - - <br /> Date Prepared - - - - <br /> Date Analyzed - - - <br /> Instrument I D # - - <br /> LCS % <br /> Recovery - - - - - <br /> % Recovery <br /> Control Limits 28-167 35-146 38-150 39-150 46-148 55-135 <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 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 /> Lk 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 Tagu <br /> Project Manager 4A20801 WAT <8> <br />