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Y 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N.Wlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd.North.Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792.0342 <br /> T <br /> ettle:CA <br /> Geostrategies Client Project ID: Tosco, 8203 E 11th <br /> 747 Court, Ste. J <br /> ublin4568ttentanna Harding QC Sample Group: 9812066-02-04, -06-09 Reported: Dec 29, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix: Liquid <br /> Method., EPA 8015A <br /> Analyst: A. PORTER <br /> ANALYTE Diesel <br /> QC Batch#: GC1208980HBPEXZ <br /> LCS ID: BLK 120898ZSIZSD <br /> Date Prepared: 1218198 <br /> Date Analyzed: 12/10/98 <br /> Instrument I.D.#: GCHP19B <br /> Conc. Spiked, ugIL: 1000 <br /> Blank Spike, ugIL: 800 <br /> % Recovery: 80 <br /> Blank <br /> • Spike Duplicate, ug/L: 340 <br /> % Recovery: 34 <br /> Relative % Difference: 81 <br /> % Recovery <br /> Control Limits: 50-150 <br /> RPD Control Limits: 0-50 <br /> The LCS Duplicate was outside of the control limits. All of the surrogates were within the control limits. The batch was validated by the remaining LCS. <br /> Quality Assurance Statement: All standard operating procedures and quality control requirements have been met. <br /> Please Nate: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> S if LYTIC L 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 /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference.the LCS recov=is to be used to validate the batch. <br /> Peggy Penner <br /> Project Manager <br /> m <br />