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S 4.0 FINDINGS The results of the groundwater sampling Indicate the following • The groundwater gradient is consistent with past monitoring event The gradient Indicates a northeast gradient direction with a slope of approximately 0 0005 Inches per foot Groundwater has dropped approximately two feet since the last monitoring event • MTBE levels are elevated northeast of the former tank pit area as opposed to the higher readings found in the previous monitoring event in monitoring well MW- 1 which is located within the former tank pit area I 5.0 CONCLUSIONS Based on the above findings, Avalon concludes the following • Further groundwater monitoring will be necessary to determine the most consistent gradient direction 6.0 RECOMMENDATIONS Based on the above conclusions, Avalon recommends the following • This report should be forwarded to the Public Health Services San Joaquin County and the Regional Water Quality Control Board Central Valley Region (RWQCBCVR) for their review I • Further characterization is necessary, both offsite and onsite in order to fully define the vertical and horizontal extent of groundwater impact 7.0 ASSESSMENT LIMITATIONS The scope of this report is limited to the matters expressly covered This report is prepared for the sole benefit of Washington Mutual Bank, and may not be relied upon by any other person or entity without the written authorization of Avalon i In preparing this report, Avalon has relied on information derived from secondary sources and personal interviews Except as set forth in this report, Avalon has made no independent investigation as to the accuracy and completeness of the information derived from secondary sources of personal interviews, and has assumed that such Information is accurate and complete i � ANDML Avalon Environmental Consultants Project#9627-001-4 Joes Truck Plaza 15600 South Harlan Road October 11, 2000 4 Lathrop, California