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F <br /> Monitoring Well Elevation of PVC Depth to Groundwater Elevation of Gradient Direction <br /> . 1 1 Groundwater <br /> MW 5 12/10/02 14 00 feet 9 38 feet +462 East <br /> MW-5 3/28103 14 00 feet 8 65 feet +535 East <br /> MW-6 2/12100 14 75 feet 7 26 feet +749 East <br /> MW-6 4/28100 14 75 feet 7 56 feet +717 East/Northeast <br /> i <br /> MW-6 9/20/00 14 75 feet 8 99 feet +576 Northeast <br /> MW 6 12/27/00 14 75 feet 9 81 feet +494 North <br /> MW-6 7130101 14 75 feet 9 20 feet +555 East/Northeast <br /> MW-6 11/5/01 14 75 feet 10 15 feet +460 East <br />' MW-6 2/27/02 14 75 feet 8 73 feet +602 East <br /> MW-6 5/21102 14 75 feet 9 01 feet +574 East <br /> MW-6 8129102 14 75 feet 9 27 feet +548 East <br /> LMMW-6 12/10/02 14 75 feet 10 1t feel +464 East <br /> W-6 3128103 14 75 feet 9 35 feet +540 East <br /> 4.0 FINDINGS <br /> The results of the groundwater sampling indicate the following <br /> r • <br /> • The groundwater gradient is consistent with past monitoring events The gradient <br /> Indicates a eastern gradient direction with a slope of approximately 0 00006 <br /> Inches per foot Groundwater has risen in elevation eight to ten Inches since the <br /> last monitoring event <br /> 1 <br /> • Five samplingevents have been performed on the newly installed wells,MWO-1, <br /> MWO-2, MWO-3 and MWO-1X. Shallow borings MWO-1 and MWO-3 were <br /> non detect for MTBE and MWO-2 had a detection of 40 ppb indicating some <br /> limited offsite migration. Deep well MW0-1X has oncreased this quarter having <br /> levels of 570 ppb MTBE <br /> 5.0 CONCLUSIONS <br /> Based on the above findings, Avalon concludes the following. <br /> • It is probable that the rise in water level this quarter accounts for the Increase in <br /> contaminat levels <br /> 1 <br /> Avalon Environmental Consultants Project# 9627-001-14 <br /> Joes Truck Plaza 15600 South Harlan Road <br /> April 21, 2003 8 Lathrop, California <br /> F <br />