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{ <br /> 680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX{650}364 9233 <br /> Sequoia <br /> �Y 404 N Wtget Lane Walnut Creek CA 94598 {9Z5}988 9600 FAX(925)988 9673 <br /> 849 5tnker Avenue Suite S Sacramento CA 95834 (916)991 9600 FAX ) 0100 <br /> Analytical (70779 <br /> ' ]455 McDowell Blvd North Ste D Petaluma,CA 94954 {707)792 1865 FAX{707)792-0342 <br /> GrOind Zero Analysis, Inc Client Project ID 96-163, Knowles Rock <br /> 1714 Main St <br /> Escalon, CA 95320 <br /> Attention Justin Powers QC Sample Group 980BC27-02 Reported Aug 31, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ' Matrix Liquid <br /> Method EPA 8015 <br /> Analyst AM <br /> ' ANALYTE Gasoline <br /> QC Batch# GCO82298BTEX17A <br /> Sample No GW980BA87-01 <br /> Date Prepared 8122198 <br /> Date Analyzed 8122198 <br /> ' Instrument I D # GCHP17 <br /> Sample Conic ug/L N D <br /> Cor1c Spiked u91L 250 <br /> ' Matrix Spike, u91L 270 <br /> % Recovery 108 <br /> Matrix <br /> Spike Duplicate ug/L 270 <br /> % Recovery 108 <br /> Relative % Difference 00 <br /> RPD Control Limits 0-25 <br /> 1 <br /> LCS Batch# GWLCS082298A <br /> Date Prepared 8122198 <br /> Date Analyzed 8122196 <br /> Instrument I D # GCHP17 <br /> ' Conc Spiked ug1L 256 <br /> ' LCS Recovery ug1L 260 <br /> LCS % Recovery 104 <br /> i <br /> Percent Recovery Control Limits <br /> ' MSIMSD 60140 <br /> LCS 70 130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> t Please Nate <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 all not of sample <br /> fortified with known quantities of specific compounds and subjected to the enure analytical procedure if <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> nterference the LCS recovery is to be used to validate the batch <br /> llk:�Luc(rece Tom <br /> Project Manager <br />