SITE INFORMATION AND CORRESPONDENCE 1995-2004

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C. A VLEACH run will be conducted with altered vertical soil distribution in the "suspect polygons" to look at groundwater results when the entire polygon has impacted soil. 5.0 Soil data needs and status of source area definition in Area I Paula Bolio asked what the issues were surrounding soil data needs in Area I. Fernando Amador replied that he had issues with source area definition. Fran Anderson asked how much information is enough to define source areas balanced with the information needed for remedial alternatives. / It was agreed that two soil borings would be collected outside source area I and two soil J borings would be collected near the western boundary of source area 4 to provide additional soil data near these two source areas. 6.0 Wrap Up/Action Items The following agreements were reached with respect to VLEACH modeling and additional data needs: 1. A VLEACH run will be conducted with conservative bounds: - doubling the infiltration rate - reviewing the site soil data distribution for Foc, volumetric water content, and total porosity, and using the 95% confidence. 2. A map of sewerAvater lines will be provided for Area 1 to understand if these lines exist within the four source areas. 3. Deed restriction specifics will be included in the FS 4. Four soil borings were agreed on: 2 near source area 1, and 2 near source area 4. 5. A VLEACH run will be conducted with an agreed upon base model setup with the new soil data included. 6. A VLEACH run will be conducted with altered vertical soil distribution in the "suspect polygons" to look at groundwater results when the entire polygon has impacted soil. 7. The agencies will provide their position on data needs with respect to source areas 2 and 3. 8. In the September 12, 1996 meeting locations for drilling in Areas I and II will be finalized. 3