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1 <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake DriveRedwood y, CA 94063 <br /> (415) 364-9600 • FAX (415) 364-9233 3 <br /> RESNA Client Prolect ID F7120 93, Quik Stop 120 <br /> 3315 Almaden Expwy ., Suite 34 Matrix Water <br /> San Jose, CA 95118 <br /> Attention Rich Garlow QC Sample Group 3LB9401-4 Reported Jan 6, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst R Lister R Lister R Lister R Lister <br /> MS/MSD <br /> Balch# 3121089 3121089 3121089 3121089 <br /> Date Prepared <br /> Date Analyzed 12/30/93 12/30/93 12/30/93 12/30/93 <br /> Instrument I D # GCHP 1 GCHP 1 GCHP 1 GCHP-1 <br /> Conc Spiked 5 0 pg/L 5 0 ug/L 5 0 Yg/L 15 Ng/L <br /> Matrix Spike <br /> % Recovery 100 98 100 100 <br /> Matrix Spike <br />' Duplicate % <br /> Recovery toe 98 100 100 <br /> Relative % <br /> Difference 20 0 0 00 00 <br /> I <br /> LCS Batch# <br /> Date Prepared - _ - <br /> Date Analyzed <br /> Instrument I D # <br /> LCS % <br /> Recovery - - <br /> % ecovery <br /> Control Limits 71 133 72-128 72 130 71 120 <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 sampte <br /> _ - fortified with known quantities of specific compounds and subjected to the enure analytical procedure kf <br /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Vickie Tague 3LB9401 RES <3 <br /> Project Manager <br />