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1' <br /> • The highest detection of MTBE encountered is 400 parts per billion (ppb) found in groundwater <br /> monitoring well MW-2 which is located approximately 20 feet east of the current tank farm <br /> 1 Monitoring well MWO-1X continues to decrease from previous levels of 94 ppb MTBE MTBE <br /> was detected for the second time in offsite monitoring well MWO-2 at a concentration of 11 <br /> ppb <br /> TABLE II <br /> 1 HISTORICAL GROUNDWATER INFORMATION <br /> (Bold designates most recent measurements) <br /> U <br /> onitonrlg Well Elevation of PVC Depth to Groundwater Elevation of Gradient Dtredton <br /> 1 Groundwater <br /> MWO-1 X 2/27/02 13 69 feet 7 68 feet +601 East <br /> MWO-1X 5/21/02 13 69 feet 7 91 feet +578 East <br /> MWO-1 X 8/29/02 13 69 feet 8 25 feet +544 East <br /> MWO.1X 12110!02 13 69 feet 9 04 feet +465 East <br /> 1 <br /> MWO-1 2/27/02 13 27 feet 7 40 feet +587 East <br /> MWO-1 5/21/02 13 27 feet 7 79 feet +548 East <br /> MWO-1 8129/02 13 27 feet 8 28 feet +499 East <br /> . MWO-1 12/10/02 13 27 feet 8 90 feet +437 East <br /> 1 <br /> MWO-2 2/27/02 13 75 feet 6 84 feel +691 East <br /> MWO-2 5/21/02 13 75 feet 8 20 feet +555 East <br /> MWO-2 8129102 13 75 feet 8 71 feet +504 East <br /> IMWO-2 12110102 13 75 feet 9 28 feet +447 East <br /> 1 <br /> MWO-3 2/27/02 14 65 feet 8 62 feet +603 East <br /> MWO-3 5/21/02 14 65 feet 8 89 feet +576 East <br /> MWO-3 8/29/02 14 65 feet 9 40 feet +525 East <br /> 1 MWO-3 12/10/02 14 65 feet 10 08 feet +457 East <br /> MW-1 2/12/00 14 16 feet 6 80 feet +736 East <br /> MW-1 4/28/00 14 16 feet 7 00 feet +716 East/Northeast <br /> MW-1 9/20100 14 16 feet 8 45 feet +571 Northeast <br /> 1 MW-1 9/20/00 14 16`eet 8 45 feet +571 Northeast <br /> MW-1 9/20100 14 16 feet 8 45 feet +571 Northeast <br /> MW-1 12/27/00 14 16 feet 9 24 feel +492 North <br /> MW-1 7/30/01 14 16 feet 8 62 feel +554 East/Northeast <br /> 1 MW-1 1115101 14 16 feet 9 51 feet +465 East <br /> • <br /> Avalon Environmental Consultants Project# 9627-001-13 <br /> Joes Truck Plaza 15600 South Harlan Road <br /> January 21,2003 5 Lathrop, California <br /> 1 <br />