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j SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 - Sacramento, CA 95834 <br /> via- (916) 921 9600 - FAX (916) 921 0100 <br /> Brown'i Caldwell - h n k Client Project ID Aico 2133-93-5, Stockton <br /> P 0 Box 13449 Matrix Water <br /> 'Sacramento, CA 95813-3449 <br /> Attention Mindy Wright OC Sample Group 311-0494 Reported Nov 18, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl- Xylenes Cadmium Chromium Copper <br /> benzene <br /> Method EPA 602 EPA 602 I=PA 602 EPA 602 EPA 200 7 EPA 200 7 EPA 200 7 <br /> Analyst Chiaravalloti Chiaravallots Chiaravalloti Chiaravaliod S Foster S Foster S Foster <br /> MS/MSD <br /> Batch# 3110248 3110248 3110248 3110248 3110494 3110494 3110494 <br /> Date Prepared 11/15/93 11/15/93 11/15/93 11/15/93 11/16/93 11/16/93 11/16/93 <br /> Date Analyzed. 11/15/93 11/15/93 11/15/93 11/15/93 11/17/93 11/17/93 11/17/93 <br /> Instrument I D # HP-2 HP-2 HP-2 HP 2 PE-40 PE-40 PE-40 <br /> Cone Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L 0 10 mg/L 0 10 mg/L o 10 mg/L <br /> Matrix Spike <br /> % Recovery 95 94 93 93 88 90 88 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 99 100 100 91 91 92 <br /> Relative % <br /> Difference 51 5 2 73 73 3 4 1 1 44 <br /> LCS Batch# <br /> Date Prepared <br /> Date Analyzed <br /> Instrument I D # <br /> LCS % <br /> Recovery - - _ _ - - _ <br /> % ecovery <br /> Control Limits 80-120 80-120 80-120 80-120 80-120 80-120 80-120 <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 H <br /> FUrida <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recove is to be used to validate the batch <br /> C Schneider <br /> Project Manager 3110494 BRS <3> <br />