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Sequoia •680 Chesapeake Drive Redwood City, CA 9406415) 364-9600 FAX (415) 364-9233 <br />4D 404 N. Wiget Lane Walnut Creek, CA 94598 (510) 988-9600 FAX (510) 988-9673 <br />'Wr Analytical 819 Striker Avenue, Suite 8 Sacramento, CA 95834 (916) 921-9600 FAX (916) 921-0100 <br />Delta Prlvironmental Consultants Cilent Protect Its: Unocal#5886 <br />3164 Gold Camp Dr., Suite 200 Matrix: Soil <br />Rancho Cordova, CA 95670 <br />Attention: Eric Holm QC Sample Group: 5080010-11 Reported: Aug 15, 1995 <br />_................ <br />QUALITY CONTROL DATA REPORT <br />ANALYTE <br />Lead Cadmium Chromium Lead Nickel Zinc <br />Method: <br />EPA 6010 <br />EPA 6010 <br />EPA 6010 <br />EPA 6010 <br />EPA 6010 <br />EPA 6010 <br />Analyst: <br />K. Barta <br />K. Barta <br />K. Barta <br />K. Barta <br />K. Berta <br />K. Barta <br />Concentration <br />Spiked: <br />50 mg/kg <br />50 mg/kg <br />50 mg/kg <br />50 mg/kg <br />50 mg/kg <br />50 mg/kg <br />LCS Batch#: <br />LCS080495 <br />LCS080495 <br />LCS080495 <br />LCS080495 <br />LCS080495 <br />LCS080495 <br />Date Prepared: <br />8/4/95 <br />8/4/95 <br />8/4/95 <br />8/4/95 <br />8/4/95 <br />8/4/95 <br />Date Analyzed: <br />8/8/95 <br />8/10/95 <br />8/10/95 <br />8/10/95 <br />8/10/95 <br />8/10/95 <br />Instrument I.D.#: <br />P-40 <br />P-40 <br />P-40 <br />P-40 <br />P-40 <br />P-40 <br />LCS % <br />Recovery: <br />92 <br />102 <br />101 <br />102 <br />103 <br />101 <br />Control Limits: <br />80-120 <br />80-120 <br />80-120 <br />80-120 <br />80-120 <br />80-120 <br />MS/MSD <br />Batch #: <br />5071512 <br />5071512 <br />5071512 <br />5071512 <br />5071512 <br />5071512 <br />Date Prepared: <br />8/4/95 <br />8/4/95 <br />8/4/95 <br />8/4/95 <br />8/4/95 <br />8/4/95 <br />Date Analyzed: <br />8/8/95 <br />8/10/95 <br />8/10/95 <br />8/10/95 <br />8/10/95 <br />8/10/95 <br />Instrument I.D.#: <br />P-40 <br />P-40 <br />P-40 <br />P-40 <br />P-40 <br />P-40 <br />Matrix Spike <br />% Recovery: <br />87 <br />96 <br />84 <br />94 <br />82 <br />84 <br />Matrix Spike <br />Duplicate % <br />Recovery: <br />88 <br />94 <br />88 <br />96 <br />83 <br />82 <br />Relative % <br />Difference: <br />1.1 <br />2.1 <br />4.6 <br />2.1 <br />1.2 <br />2.4 <br />SEQ,�OIA ANALYTICAL f <br />1 Linda C. Schneider <br />Project Manager <br />Please Note: <br />The LCS is a control sample of known, interferent free matrix that is analyzed using the same reagents, <br />preparation and analytical methods employed for the samples. The LCS % recovery data is used for <br />validation of sample batch results. Due to matrix effects, the QC limits for MS/MSD's are advisory only <br />and are not used to accept or reject batch results. <br />5080010.DLT <7> <br />