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1 <br /> =MlonitoringWell Elevation of PVC Depth to Groundwater Elevation of Gradient Direction <br /> Groundwater <br /> 1 MW-5 7/30/01 14 00 feet 8 53 feet +547 East/Northeast <br /> MW s 11/5/01 14 00 feet 9 40 feet +4 6 East <br /> MW-6 2/12/00 14 75 feet 7 26 feet +749 East <br /> MW-6 4/28/00 14 75 feet 7 56 feet +717 East/Northeast <br /> 1 MW-6 9/20/00 14 75 feet 8 99 feet +5 76 Northeast <br /> MW-6 12/27/00 14 75 feet 9 81 feet +494 North <br /> MW-6 7/30/01 14 75 feet 9 20 feet +555 East/Northeast <br /> MW-6 11/5/01 14 75 feet 10 15 feet +460 East <br /> 4,0 FINDINGS <br /> The results of the groundwater sampling Indicate the following <br /> The groundwater gradient 1s east/northeast with a stronger eastern component <br /> The slope is approximately 0 00003 Inches per foot Groundwater elevation <br /> has gone down approximately 1 0 feet since the last monitoring event <br /> • MTBE levels are elevated northeast of the former tank as in the third quarter <br /> groundwater monitoring event Levels of MTBE in groundwater monitoring are <br /> very similar to the last sampling events <br /> 5.0 CONCLUSIONS <br /> Based on the above findings, Avalon concludes the following <br /> • MTBE concentrations appear to be changing significantly at the subject <br /> property <br /> I 6.0 RECOMMENDATIONS <br /> Based on the above conclusion, Avalon recommends the following <br /> • This report should be forwarded to the Public Health Services San Joaquin <br /> I Count d the Regional Water <br /> Y ang tonaQuality Control Board Central Valley Region <br /> (RWQCBCVR) for their review <br /> r <br /> Avalon Environmental Consultants Project# 9627-001-8 <br /> Joe's Truck Plaza 15600 South Harlan Road <br /> December 5, 2001 5 Lathrop, California <br />