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• 680 Chesapeake Drive Redwood Cry CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek.CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite a Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> is <br /> Gettler Ryan/Geostrategles Client Project ID Unocal 2859, Stockton <br /> 6747 Sierra Court, Ste J <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9806C89/C90 Reported Jul 23, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matnx Liquid <br /> Method EPA 300 0 <br /> Analyst G Fish <br /> ANALYTE Fluoride Chloride Nitrite Bromide Nitrate Phosphate Sulfate <br /> QC Batch # 0619983000ACA <br /> Sample No 9806C94-6 <br /> Date Prepared 6119198 6119198 6119198 6119/98 6119/98 6119198 6119198 <br /> Date Analyzed 6119198 6119198 6119198 6119198 6119198 6119/98 6119198 <br /> Instrument I D# INAC1 INAC1 INAC1 INAC1 INAC1 INAC1 INAC1 <br /> Sample Conc ,mglL N D 40 N D N D 6 2 N D 55 <br /> Conc Spiked, mglL 100 100 100 100 100 100 100 <br /> Matrix Spike, mglL 100 140 95 91 94 86 150 <br /> % Recovery 100 100 95 91 88 86 95 <br /> Matrix <br /> *Spike Duplicate, mglL 100 140 95 91 94 87 140 <br /> % Recovery 100 100 95 91 88 87 85 <br /> Relative % Difference 0 0 0 0 00 00 0 0 1 2 11 <br /> RPD Control Limits <br /> LCS Batch# IN0619983000ACA <br /> Date Prepared 6119198 6119198 6119198 6119198 6119198 6119198 6119198 <br /> Date Analyzed 6119198 6/19198 6119198 6119198 6119198 6/19198 6119/98 <br /> Instrument I D # INAC1 INAC1 INAC1 INAC1 INAC1 INAC1 INAC1 <br /> Conc Spiked, mglL 10 10 10 10 10 10 10 <br /> LCS Recovery, mg1L 10 9 1 9 5 9 1 9 3 9 4 10 <br /> LCS % Recovery 100 91 95 91 93 94 100 <br /> Percent Recovery Control Limits <br /> F- <br /> IVISIMS0 75125 75125 75-125 75125 75125 75125 75125 <br /> LCS 90-110 90-110 90110 90-110 90110 90110 90-110 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <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 /> 0 <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure it <br /> the recovery of anafytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS feCGVGfy is to be used to validate the batch <br /> Tod Granicher <br /> Project Manager <br />