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Sequoia <br />4D <br />680 Chesapeake Drive <br />404 N Wlget Lane <br />Redwood City CA 94063 <br />Walnut Creek CA 94598 <br />(650) 364 9600 <br />(925) 988-9600 <br />FAX (650) 364-9233 <br />FAX (925) 988-9673 <br />Analytical <br />VQ or <br />819 Striker Avenue, Suite 8 Sacramento CA 95834 <br />1455 McDowell Blvd North Ste D Petaluma, CA 94954 <br />(916) 921-9600 <br />(707) 792-1865 <br />FAX (916) 921-0100 <br />FAX(707)792-0142 <br />*ttler-Ptyan - Dublin <br />Client Project ID <br />Chevron #9-5775, Lodi <br />Prep Method <br />EPA 3550 <br />747 Sierra Court, Suite J <br />Matrix <br />Solid <br />EPA 3550 <br />Method <br />Dublin, CA 94568 <br />EPA 8270 <br />EPA 8270 <br />EPA 8270 <br />EPA 8270 <br />Attention Greg A Gurss <br />OC Sample Group <br />8082208-221 <br />Reported <br />Sep 1, 1998 <br />QUALITY CONTROL DATA REPORT <br />ANALYTE <br />Acenaphthene <br />4-Nitrophenol <br />2,4-Dinitro- <br />Pentachloro <br />Pyrene <br />Date Analyzed <br />8/26/98 <br />Instrument I D # <br />toluene <br />phenol <br />3300pg/kg <br />Prep Method <br />EPA 3550 <br />EPA 3550 <br />EPA 3550 <br />EPA 3550 <br />EPA 3550 <br />Method <br />EPA 8270 <br />EPA 8270 <br />EPA 8270 <br />EPA 8270 <br />EPA 8270 <br />Analyst <br />L Diaz <br />L Diaz <br />L Diaz <br />L Diaz <br />L Diaz <br />MS/MSD <br />BLK0825986 <br />Batch# <br />8082220 <br />Date Prepared <br />8/25/98 <br />Date Analyzed <br />8/26/98 <br />Instrument I D # <br />GC/MS 1 <br />Conc Spiked <br />3300pg/kg <br />Matrix Spike <br />GC/MS 1 <br />% Recovery <br />76 <br />Matrix Spike <br />3300 Vg/kg <br />Duplicate % <br />3300,ug/kg <br />Recovery <br />79 <br />Relative % <br />79 <br />Difference <br />3 9 <br />RPD Limit <br />0-40 <br />LCS Batch# <br />BLK0825986 <br />Date Prepared <br />8/25/98 <br />Date Analyzed <br />8/26/98 <br />Instrument I D # <br />GC/MS 1 <br />LCS % <br />8/26/98 <br />Recovery <br />88 <br />8082220 <br />8082220 <br />8082220 <br />8082220 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/26/98 <br />8/26/98 <br />8/26/98 <br />8/26/98 <br />GC/MS 1 <br />GC/MS 1 <br />GC/MS 1 <br />GC/MS 1 <br />5000fug/kg <br />3300 Vg/kg <br />5000,ug/kg <br />3300,ug/kg <br />62 <br />73 <br />80 <br />79 <br />62 <br />76 <br />82 <br />79 <br />00 <br />41 <br />25 <br />00 <br />040 <br />0-40 <br />0-40 <br />0-40 <br />BLK082598B <br />BLK082598B <br />BLK082598B <br />ELK082598B <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/26/98 <br />8/26/98 <br />8/26/98 <br />8/26/98 <br />GC/MS 1 <br />GC/MS 1 <br />GC/MS 1 <br />GC/MS 1 <br />74 88 86 94 <br />°kRecovery <br />Control Limits 31-137 11 114 28-89 17 109 35-142 <br />SEQUOIA ANALYTICAL, #1271 <br />tul� <br />lanne 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 If <br />the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br />interference, the LCS recovery is to be used to validate the batch <br />Page 2 of 2 <br />8082208 GET <37> <br />