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(T� Sequoia .680 Chesapeake Drive Redwood City, CA 9406415) 364-9600 FAX (415) 364-9233 <br />404 N. Wiget Lane Walnut Creek, CA 94598 (510) 988-9600 FAX (510) 988-9673 <br />Analytical 819 Striker Avenue, Suite 8 Sacramento, CA 95834 (916) 921-9600 FAX (916) 921-0100 <br />::.:::.::.:::.::.::::::::.::.::.::::: <br />........................................:::::::::::::::::::::::.::::::::::::.............................:: <br />Delta Environmental Consultants Client Project lD: � � Unocal #886 ��� <br />3164 Gold Camp Dr., Suite 200 Matrix: Soil <br />Rancho Cordova, CA 95670 <br />Attention: Eric Holm QC Sample Group 507-1403 Reported: Aug 10, 19! <br />QUALITY CONTROL DATA REPORT <br />ANALYTE Chloro- <br />1,1-Dichloroethene Trichloroethene benzene <br />Method: <br />EPA 8010 <br />EPA 8010 <br />EPA 8010 <br />Analyst: <br />K. Pocan <br />K. Pocan <br />K. Pocan <br />Concentration <br />Spiked: <br />10 ug/L <br />10 ug/L <br />10 ug/L <br />LCS Batch#: <br />LCS080895 <br />LCS080895 <br />LCS080895 <br />Date Prepared: <br />8/8/95 <br />8/8/95 <br />8/8/95 <br />Date Analyzed: <br />8/8/95 <br />8/8/95 <br />8/8/95 <br />Instrument I.D.#: <br />GCHP-5 <br />GCHP-5 <br />GCHP-5 <br />LCS % <br />Recovery: <br />80 <br />88 <br />126 <br />Control Limits: <br />70-130 <br />70-130 <br />70-130 <br />MS/MSD <br />Batch #: <br />5080151 <br />5080151 <br />5080151 <br />Date Prepared: <br />8/8/95 <br />8/8/95 <br />8/8/95 <br />Date Analyzed: <br />8/8/95 <br />8/8/95 <br />8/8/95 <br />Instrument I.D.#: <br />GCHP-5 <br />GCHP-5 <br />GCHP-5 <br />Matrix Spike <br />% Recovery: <br />75 <br />82 <br />61 <br />Matrix Spike <br />Duplicate % <br />Recovery: <br />65 <br />76 <br />60 <br />Relative % <br />Difference: <br />14 <br />7.6 <br />1.2 <br />SEQUOIA ANALYTICAL <br />LZI)161'a�' <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 />L• <br />5071403. DLT <11> <br />