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1 <br /> 4.0 FINDINGS <br /> 1 The results of the groundwater sampling Indicate the following <br /> • The groundwater gradient is east/northeast with a stronger eastern component <br /> The slope is approximately 0 00003 Inches per foot Groundwater elevation <br /> has gone down approximately 0 5 feet since the last monitoring event <br /> 1 <br /> • MTBE levels are elevated northeast of the former tank as in the fourth quarter <br /> groundwater monitoring event Levels of MTBE in groundwater monitoring <br /> well MW-3 are significantly higher than in previous sampling events <br /> 1 5.0 CONCLUSIONS <br /> Based on the above findings, Avalon concludes the following <br /> • MTBE concentrations appear to be decreasing slightly at the subject property <br /> 1 <br /> 6.0 RECOMMENDATIONS <br /> Based on the above conclusion, Avalon recommends the following <br /> 1 This report should be forwarded to the Public Health Services San Joaquin <br /> County and the Regional Water Quality Control Board Central Valley Region <br /> (RWQCBCVR) for their review <br /> 7.0 ASSESSMENT LIMITATIONS <br /> 1 <br /> The scope of this report Is limited to the matters expressly covered This report is <br /> prepared for the sole benefit of Washington Mutual Bank, and may not be relied upon <br /> by any other person or entity without the written authorization of Avalon <br /> In preparing this report, Avalon has relied on information derived from secondary <br /> sources and personal Interviews Except as set forth in this report, Avalon has made <br /> no independent investigation as to the accuracy and completeness of the information <br /> derived from secondary sources of personal interviews, and has assumed that such <br /> information is accurate and complete <br /> I <br /> It should be recognized that the definition and evaluation of geologic and hydrologic <br /> conditions, as well as the assessment of chemical fate and movement in these <br /> conditions Is a difficult and inexact science Judgments leading to conclusions are <br /> generally made with incomplete knowledge of the subsurface conditions present <br /> I <br /> Avalon Environmental Consultants Project# aria 001-7 <br /> Joe's Truck Plaza <br /> 15600 South Harlan Road <br /> August 16, 2001 5 Lathrop, California <br /> i <br />