SITE INFORMATION AND CORRESPONDENCE

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JU ROB WOOTON PAGE 2 do not indicate an enormous impact to the surrounding soil and, therefore, to groundwater as well. Although this release is located such that a resulting groundwater plume may migrate in the direction of the California Building, the low levels detected in the soil and the distance between the release and the California Building (greater than 200 feet) indicate that it is very unlikely to affect the property. This tank is no longer in service and is scheduled to be removed from the site in the next month. The two USTs formerly located at the County Courthouse, 222 E. Weber Avenue, have been removed, with the last tank being removed on August 30, 1996. Based on observations at the time of the removal, this site also shows soil contamination at approximately 25' to 30' below ground surface. Without the benefit of physical data, the overall impact to the area cannot be predicted at this time. However, the California Building is located approximately 150 feet away from this release site, a significant distance. A groundwater plume resulting from this release has the potential to migrate generally towards the California Building but, considering the distance, would likely have an insignificant affect on the groundwater beneath the site. Dilution, attenuation, and biological degradation are factors that cause levels of contaminants to decline as the plume migrates outward and away from the source area. This is well documented to occur at fuel leak sites and is the basis for a new statewide policy on fuel leak sites currently being drafted by the State Water Resources Control Board. Based on this science, only a minor impact to a site located 150 feet away from a source area would be expected, and only from a sufficiently significant source area. Please be advised that San Joaquin County is the sole responsible party for the two UST sites with potential for migration towards the California Building. San Joaquin County has worked to maintain compliance with the regulatory requirements for USTs and this situation is not expected to change in the future. Time schedules for required compliance actions are based on, in part, the financial resources available to a responsible party. Often, responsible parties with multiple tank sites, such as San Joaquin County, have limited resources to spend on investigation and cleanup actions. Consequently, work at any one site may be delayed while resources are spent on a higher priority site. Additional work at these two sites will be scheduled based on their risk to human health and the environment and the County's financial resources. Although it may be some time before these two sites meet fnai regulatory requirements, compliance during this time period will not be an issue and will continue to be the sole responsibility of San Joaquin County. Adjacent property owners that may be affected by a migrating groundwater plume from these release sites are not