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Sequoia <br />� Analytical <br />*ettler-Ryan - Dublin <br />747 Sierra Court, Suite J <br />Dublin, CA 94,968 <br />Attention Greg A Gurss <br />zene <br />Method FPA $020 <br />Analyst C Westwater <br />MS/MSD <br />Batch# <br />Date Prepared <br />Date Analyzed <br />Instrument f D ## <br />Conc Spiked <br />Matrix Spike <br />% Recovery <br />Matrix Spike <br />Duplicate % <br />Recovery <br />Relative % <br />Difference <br />LCS Batch# <br />Date Prepared <br />Date Analyzed <br />Instrument I D # <br />LCS % <br />Recovery <br />Control Limits <br />680 Chesapeake Drive <br />404 N Wiget Lane <br />Redwood City CA 94063 <br />919 Striker Avenue Suite a <br />Walnut Creek C4 94598 <br />1455 McDowell Blvd North Ste D <br />Sacramento CA 95834 <br />Petaluma, C4 94954 <br />Client Project lD Chevron #9-8775, Lodi <br />Matrix Solid <br />QC Sample Group 8082208-221 <br />QUALITY CONTROL DATA REPORT <br />Toluene Ethyl Xylenes <br />Benzene <br />EPA 8020 EPA 8020 <br />EPA 8D20 <br />C WIstwater <br />C Westwater C Westwater <br />A8010o72 <br />A8010072 <br />Ae010072 <br />A8010072 <br />i 8/25/98 <br />8/25/98 <br />8/25/98 <br />9& 25 <br />/ <br />8/25/98 <br />HP -5 <br />8/25/98 <br />HP -5 <br />8a/ /25 /98 <br />8/25198 <br />0 80 mg/kg <br />9/ 9 <br />0 80 mg/kg <br />HP -5 <br />0 <br />HP -5 <br />80 mg/kg <br />2 4 mg/kg <br />120 <br />125 <br />121 <br />133 <br />90 93 <br />91 96 <br />29 30 <br />28 33 <br />5LC8082588 <br />5LCS082598 <br />5LCS082598 <br />5LC50$2598 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/25198 <br />HP -5 <br />HP -5 <br />8/25/98 <br />8125/98 <br />HP 5 <br />HP_g <br />96 98 <br />98 1 m <br />50-150 50150 <br />50150 50-150 <br />(650) 364-9600 <br />(925} 9$$_9(,00 <br />FAX (4550) 364_9233 <br />(916) 92t-9600 <br />FAX (92 5) 988-9673 <br />FAX ( 916) 921 - 0 loo <br />(707)792-1865 <br />FAX(707)792-0342 <br />Reported Sep 1, 1998 <br />SEQUOIA ANALYTICAL, The LCS +s a control sample of knflwn, interferent free matrix that is analyzed using the same reagents, <br />' #���� Preparation, and analytical methods employed for tha samples The matnx spike is an ai+ uat of <br />ted <br />fortified with known quantities of specrfre compounds and subs Thted to the entire anal <br />the recovery of analytes from the matrix spoke does not toff within sp$c+hed control Lim q sample <br />interference, the LCS recove is to be used to validate the batch analytical e o mAtn if <br />Julianne Fegley its due to matrix <br />Project Manager <br />8082208 GET 133, <br />