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Mr. Tom Horton Project 939-03 . 13 March .25, 1988 •Page 3 Subtask 6-1 - Landfill Characterization An analysis describing how the ground water and surface water may affect the landfill and how the landfill may affect ground water and surface water will be included in the SWAT report, according to Section 2595(a) of Title 23, Chapter 3, Subchapter 15 of the Califor- nia Administrative Code. Subtask 6- - Topographic Characterization A base map will be prepared of the landfill and the surrounding region within 1 mile showing elevation contours, natural ground slopes, drainage patterns, and other features, according to Section 2595(d) of Subchapter 15. Subtask 6-3 - Geologic Characterization Based on data from previous site investigations (Ground-Water xplora- tion Program. Corral Hollow Landfill San Joaquin County. California, EMCON Associates, January 1988) and the monitoring wells proposed in Task 1, a geologic map and geologic cross sections of the landfill will be prepared showing lithology and structural features. The cross sections will be indexed to the geologic map and located to best portray geologic features relevant to the landfill . A description of the geologic materials at the site and its surround- ings, including identification of soil types, stratigraphy, mode of deposition, and other pertinent lithologic data will be prepared. This description will include the geologic structure where identifi- able, including the attitude of bedding; thicknesses of beds, the nature, type, and orientation of any folds; the location, attitude, and nature of any faults; and other pertinent structural data. Subtask 6-4 - Hydrogeologic Characterization An evaluation of the water-bearing characteristics of the natural geologic materials identified at the site will be performed by incor- porating data from previous site investigations (EMCON Associates, January 1988) with data from permeability tests performed in the proposed monitoring wells. Based on published data and data from the existing and proposed monitoring wells, an evaluation of the perennial direction(s) of ground-water movement within the uppermost ground- water zone(s) within 1 mile of the landfill perimeter will be per- formed. Subtask 6-5 - Regional Land-Use and Water-Use Survey A regional land-use and water-use survey is needed for the SWAT report. A map showing the locations of monitoring wells, water wells, oil/gas wells, geothermal wells, and springs will be prepared for submittal with the SWAT report, according to Section 2595(h) (1) of Subchapter 15. If available, pertinent well information (e.g. , owner, C� _� ('Y