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i • Monitoring Well Elevation of PVC Depth to Groundwater Elevation of Gradient Direction Groundwater i MW-4 2127/02 13 56 feet 7 56 feet +600 Northeast MW-4 5121/02 13 56 feet 7 89 feet +567 North MW-5 2/12/00 14 00 feet 6 77 feet +723 East MW-5 4128/00 14 00 feet 6 78 feet +722 East/Northeast i MW-5 9120100 14 00 feet 8 29 feet +571 Northeast MW-5 12/27/00 14 00 feet 9 02 feet +498 North MW-5 7/30/01 14 00 feet 8 53 feet +547 East/Northeast MW-5 11/5/01 14 00 feet 9 40 feet +460 East i MW-5 2127/01 14 00 feet 7 99 feet +601 Northeast MW-5 5121102 14 00 feet 8 31 feet +569 North MW-6 2112/00 14 75 feet 7 26 feet +749 East MW-6 4/28/00 14 75 feet 7 56 feet +717 East/Northeast 1 MW-6 9/20/00 14 75 feet 8 99 feet +5 76 Northeast MW-6 12/27/00 14 75 feet 9 81 feet +494 North MW-6 7/30/01 14 75 feet 9 20 feet +555 East/Northeast MW-6 11/5101 14 75 feet 10 15 feet +460 East MW-6 2127/02 14 75 feet 8 73 feet +602 Northeast MW-6 5121102 1 14 75 feet 9 01 feet +574 North I 4.0 FINDINGS The results of the groundwater sampling indicate the following • The groundwater gradient is consistent with past monitoring events The i gradient indicates a eastern gradient direction with a slope of approximately 0 00006 inches per foot Groundwater has dropped approximately four inches since the last monitoring event. • Only two monitoring events have been performed on the newly installed wells, ► MWO-1,MWO-2,MWO-3 and MWO-1 X The three shallow borings MWO-1 through MWO-3 were non detect for MTBE indicating that the horizontal limits of MTBE in the shallow horizon have been defined MWO-1 X contained elevated detections of MTBE of 470 ppb, however, this was a decrease from the first monitoring event of 570 ppb in February 27, 2002 I Avalon Environmental Consultants Project# 9627-001-10 Joes Truck Plaza 15600 South Harlan Road August 19, 2002 6 Lathrop, California I