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Sequoia <br />680 Chesapeake Drive Redwood City CA 94063 <br />(650) 364-9600 <br />FAX(650)364-9233 <br />1wr Ana ytiea <br />404 N Wiget lane Walnut Creek, CA 94598 <br />819 Sinker Avenue Suite 8 Sacramento CA 95834 <br />E455 McDowell Blvd North Ste D Petaluma. CA 94954 <br />(925)9a8-9600 <br />(916) 921-9600 <br />(707) 792-1865 <br />FAX (925) 988-9673 <br />FAX (916) 921 -0100 <br />FAX (707) 792-0342 <br />aer-Ryan - Dublin <br />Client Project ID Chevron #9-5775, Lodi <br />Conc Spiked <br />0 80 mg/kg <br />6747 Sierra Court, Suite J <br />Matrix Solid <br />% Recovery <br />105 <br />Dublin, CA 94568 <br />Matrix Spike <br />Attention Barbara Sieminski <br />QC Sample Group 901-1988 <br />Reported <br />Feb 2, 1999 <br />QUALITY CONTROL DATA REPORT <br />ANALYTE Benzene <br />Toluene Ethyl Xylenes Lead <br />Batch# <br />Benzene <br />Method EPA 8020 <br />EPA 8020 EPA 8020 EPA 8020 EPA 6010 <br />Analyst C Westwater <br />C Westwater C Westwater C Westwater J Kelly <br />MS/MSD <br />902001 <br />Batch# <br />902001 <br />Date Prepared <br />2/1/99 <br />Date Analyzed <br />2/1/99 <br />Instrument I D.# <br />HP -4 <br />Conc Spiked <br />0 80 mg/kg <br />Matrix Spike <br />% Recovery <br />105 <br />. <br />Matrix Spike <br />Duplicate % <br />Recovery <br />111 <br />Relative % <br />Difference <br />58 <br />LCS Batch# 4LCS020199 <br />Date Prepared 2/1/99 <br />Date Analyzed: 2/1/99 <br />Instrument I D # HP -4 <br />LCS % <br />Recovery 99 <br />902001 <br />2/1/99 <br />2/1/99 <br />HP -4 <br />0 80 mg/kg <br />902001 <br />902001 <br />2/1/99 <br />2/1/99 <br />2/1/99 <br />2/1/99 <br />HP -4 <br />HP -4 <br />0 80 mg/kg <br />2 4 mg/kg <br />91 <br />95 <br />104 <br />96 <br />98 <br />108 <br />53 <br />4LCS020199 <br />2/1/99 <br />2/1/99 <br />HP -4 <br />84 <br />26 39 <br />4LCS020199 <br />4LCS020199 <br />2/1/99 <br />2/1/99 <br />2/1/99 <br />2/1/99 <br />HP -4 <br />HP -4 <br />9011886 <br />1/29/99 <br />2/1/99 <br />MV -4 <br />50 mg/kg <br />37 <br />LCS012999 <br />1/29/99 <br />2/1/99 <br />MV -4 <br />86 96 96 <br />Recovery <br />Control Limits 50-150 50-150 50.150 50.150 80-120 <br />SE011.101A ANALYTICAL, #1271 <br />0 <br />Julianne Fegley <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 matrix spike is an aliquot of sample <br />fortified with known quantities of specific compounds and subjected to the entire analytical procedure M <br />the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br />interference, the LCS recovery is to be used to validate the batch <br />' Value undeterminable due to matnx interference and/or concentration in sample <br />9011988 GET <3> <br />