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if <br /> 7.0 CONCLUSIONS <br /> Based on the above findings, Avalon concludes the following <br /> • It is unlikely that any offsite wells have been impacted by this release <br /> • Levels of MTBE in MW-2 located northeast of the former tank pit were <br /> considerably higher than levels of MTBE in MW-1 located near the center of the <br /> former tank pit This indicates the potential for a northern gradient component <br /> • The detection of 240 ppb MTBE in MW-1 located near the center of the former <br /> tank pit as opposed to the initial sampling of the groundwater in the former tank <br /> pit collected at the time of the tank removals showed MTBE levels at 31,000 <br /> ppb indicate that there has been a decrease in MTBE concentrations from that <br /> event <br /> 8.0 RECOMMENDATIONS <br /> Based on the above conclusions, Avalon recommends the following <br /> • Continuation of quarterly groundwater monitoring and sampling at the subject <br /> property in order to see consistency and or patterns in gradient direction and <br /> MTBE levels <br /> 9.0 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 foes Truck Plaza This report may not be relied upon <br /> by any other person or entity without the written authorization of Avalon <br /> Environmental Consultants <br /> In preparing this report, Avalon Environmental Consultants has relied on information <br /> derived from secondary sources and personal interviews Except as set forth in this <br /> report, Avalon has made no independent investigation as to the accuracy and <br /> completeness of the information derived from secondary sources of personal <br /> interviews, and has assumed that such information is accurate and complete <br /> i 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 /> More extensive studies may be performed to reduce these inherent uncertainties No <br /> i warranty, expressed or implied, is made <br /> Avalon Environmental Consultants 9627-001-2 <br /> Joes Truck Plaza 15600 South Harlan Road <br /> March 20, 2000 9 Lathrop, California <br />