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I Mwit—gWali Dale Cd6aed TOTAL PETROLEUM AROMATIC VOLATILE ORGANIC ANP OXYGENATES HYPROG1a90n4 GASOLINE DIESEL BENZENE TOLUENE ETHYL Ik#UW TAME Iiwt4uund MTBE 1 2 DCA BENZENE E#W-A and EDB Methr l - - I 12/27!00 NO ND ND NO ND ND ND NO NO NO 7/30/01 NO ND ND NO ND NO NO NO NO ND 11/5/01 NO NO ND NO NO NO NO NO NO NO 2/27/02 ND NA NO NO NO NO NO NO ND NO 5/21102 NO NA ND ND NO NO NO NO NO NO 8129/02 ND NA ND NO NO NO ND NO ND NO 12/10/02f�NA NA NO ND NO NO NO NO NO NO 3128103 NO I ND I ND NO ND ND NO ND Note N D — Not Detected at Method Detection Limits N,A — Not Analyzed Detection Limits EPA Method 82606 vanes most are — 5 0 ppb The highest detection of MTBE encountered is 1,300 parts per billion (ppb) found in I groundwater monitoring well MW-2 which is located approximately 20 feet east of the current tank farm Monitoring well MWO-1X had an increase from previous levels, having 570 ppb MTBE MTBE was detected for the third time in offsite monitoring well MWO-2 at a concentration of 40 ppb TABLE II HISTORICAL GROUNDWATER INFORMATION (Bold designates most recent measurements) Monitoring Well Elevation of PVC Depth to Groundwater Elevation of Gradient Direction Groundwater MWO-1 X 2127102 13 69 feet 7 68 feet +601 East MWD-1 X 5/21/02 13 69 feet 7 91 feet +578 East MWO-1 X 8/29/02 13 69 feet 8 25 feet +544 East MWO-1 X 12/10/02 13 69 feet 9 04 feet +465 East MWO-1X 3128103 13 69 feet 8 31 feet +538 East MWO-1 2127102 13 27 feet 7 40 feet +587 East MWO-1 5/21/02 13 27 feet 7 79 feet +548 East MWO-1 8129/02 13 27 feet 8 28 feet +499 East MWO 1 12/10/02 13 27 feet 8 90 feet +437 East MWO-1 3128103 13 27 feet 8 13 feet +514 East MWO-2 2127102 13 75 feet 6 84 feet +691 East 1 • Avalon Environmental Consultants Project#9627-001-14 Joes Truck Plaza 15600 South Harlan Road April 21, 2003 5 Lathrop, California I