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1 <br /> . limited offsite migration Deep well MW0-1 X continues to decline having levels <br /> of 94 ppb MTBE <br /> i <br /> 5.0 CONCLUSIONS <br /> Based on the above findings, Avalon concludes the following- <br /> Further groundwater monitoring will be necessary to determine if the decrease <br /> in the deep monitoring well MWO-1X in this quarter is representative of <br /> fluctuation or of a true decrease <br /> • Further groundwater monitoring will be necessary to determine if the offsite <br /> 1 property to the north which had a detection of MTBE in this quarter has been <br /> significancy impacted <br /> 6.0 RECOMMENDATIONS <br /> 1 Based on the above conclusions, Avalon recommends the following <br /> • This report should be forwarded to the Public Health Services San Joaquin County <br /> and the Regional Water Quality Control Board Central Valley Region <br /> (RWQCBCVR) for their review <br /> 1 <br /> • Further groundwater testing should be performed prior to installation of any new <br /> deep wells it order to determine if the contaminant levels encountered in MWO- <br /> 1X are decreasing <br /> I 7.0 ASSESSMENT LIMITATIONS <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 /> I <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 no <br /> 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 /> It should be recognized that the definition and evaluation of geologic and hydrologic <br /> conditions, as well as theassessment ofchemical fate and movement in these conditions <br /> is a difficult and inexact science judgments leading to conclusions are generally made <br /> with incomplete knowledge of the subsurface conditions present More extensive studies <br /> Avalon Environmental Consultants <br /> Joes Truck Plaza Prosect#9627-001-13 <br /> 15600 South Harlan Road <br /> January 21,2003 8 Lathrop, California <br />