COMPLIANCE INFO_FILE 2 - Laserfiche WebLink

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CLEANUP AND ABATEMENT ORDER -3- SOUTHWEST HIDE COMPANY SAN JOAQUIN COUNTY prepared. This work plan should describe the data deficiencies and the planned field activities, in detail , for each potential source where data gaps have been identified. If a potential source is adequately assessed, the data justifying this conclusion should be provided. For those sources where the extent of soil pollution is known, a mitigation/ remedial plan should be prepared. This plan should discuss the water quality implications of no mitigation, partial mitigation (say 50%) , and complete mitigation. Cost estimates and time estimates for the implementation of these mitigation measures should be developed. B. Hydrogeologic Characteristics The hydrogeologic characteristics of the underlying strata (currently or potentially) affected by contamination from the site, should be determined and described. The characteristics should include the following: a. Hydraulic conductivity, b. Hydraulic gradient, c. Effective porosity, d. Ground water velocity (magnitude and direction) , e. Depths and thicknesses. The data used to determine these characteristics should be discussed in detail . A minimum of two geologic cross-sections, prepared from the geologic well logs, and preferably oriented parallel and perpendicular to the ground water flow direction, should be prepared. Ground water elevation data should be presented in tabular form sorted by well number, sampling date and well screen depth. Potentiometric contour and ground water flow mapping of the water elevation data should be conducted, and maps showing typical and seasonal trends should be prepared. The objective of this activity is to determine the hydrogeologic characteristics of the site' s underlying strata, such that all potential pathways of pollution migration are identified and characterized. This hydrogeologic characterization of potential pathways must be sufficiently detailed to complete Activity 1-C of this Order "Plume Delineation" . If existing data are insufficient to adequately characterize the underlying strata, then a field investigation work plan, including time lines, should be prepared. This work plan should describe, in detail , the data deficiencies and the planned field activities.