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Sequoia <br />hesapeake Drive <br />404 N. Wiget Lane <br />Redwood City. CA 9 <br />Walnut Creek, CA 94598 <br />(650) 3649600 <br />(925) 988-96M <br />FAX (650) 3649233 <br />FAX (925) 988-%73 <br />0.100 <br />819 Stoker Avenue, Suite 8 <br />Sacramento, CA 95834 <br />(916) 921-9600 <br />FAX (916) 921-0100 <br />—�i)— Analytical <br />1455 McDowell Blvd. North, Ste. D <br />Petaluma, CA 94954 <br />(707) 792-1865 <br />FAX (707) 792-0342 <br />5/6/99 <br />1551 Industrial Road <br />San Carlos, CA 94070-4111 <br />(650) 232-9600 <br />FAX (650) 232-9612 <br />Cambria Environmental Project: EQUILON, 1313 E. Charter Way, Stockton, CA Sampled: 4/29/99 <br />270 Perkins Street Project Number: N/A Received: 4/29/99 <br />Sonoma, CA 95476 Project Manager: Aubrey Cool Reported: 5/4, 7/99 <br />Volatile Oxygenate Compounds by EPA Method 8260A/Quality Control <br />Sequoia Analytical - Sacramento <br />Date Spike Sample QC Reporting Limit Recov. RPD RPD <br />Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br />Batch: 9050049 Date Prepared: 5/4/99 <br />Blank 9050049-BLKI <br />Tert-butyl alcohol 5/6/99 <br />Extraction <br />ND mg/kg <br />Method: EPA 50306 (MeOHI <br />10.0 <br />Methyl cert -butyl ether <br />ND <br />0.100 <br />Di -isopropyl ether <br />ND <br />0.100 <br />Ethyl tert-butyl ether <br />ND <br />0.100 <br />Tert-amyl methyl ether <br />ND <br />0.100 <br />Surrogate: 1,2 -DCA -d4 <br />" <br />1.50 <br />1.39 <br />60.0-140 <br />95.6 <br />US <br />9050049 -BSI <br />Methyl tert-butyl ether <br />5/6/99 <br />2.50 <br />2.82 <br />mg/kg <br />70.0-130 <br />113 <br />Surrogate: 1,2 -DCA -d4 <br />" <br />1.50 <br />1.79 <br />60.0-140 <br />111 <br />Matrix Spike <br />9050049 -MSI <br />5904402-01 <br />Methyl tert-butyl ether <br />5/6/99 <br />2.50 <br />ND 2.71 <br />mg/kg <br />60.0-140 <br />108 <br />Surrogate: 1,1 -DCA -d4 <br />" <br />1.50 <br />1.63 <br />60.0-140 <br />105 <br />Matrix Spike Duo <br />Methyl tert-butyl ether <br />9050049-MSDI <br />5/6/99 <br />5904402-01 <br />ND 2.55 <br />mg/kg <br />60.0-140 <br />102 25.0 5.71 <br />2.50 <br />Surrogate: 1,2 -DCA -d4 <br />112.50 <br />1.53 <br />" <br />60.0-140 <br />101 <br />Sequoia Analytical - Sacramento *Refer to end of report for text of notes and definitions. <br />Sandra R. Hanson, Client Services Representative <br />Page 14 of 15 <br />