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Physical Setting <br />Soils <br />Initial sizing, placement, and orientation of the landfill was done within the constraints <br />offered by the physical settings. Drainage design was influences by the surrounding <br />surface watershed and drainage flow -paths. Module depth below the ground surface was <br />influenced the depth to groundwater and soil conditions. <br />Onsite soils are used for operations layer, daily cover, intermediate cover, and will be <br />used in the final cover. All these uses require soils with suitable properties. Engineers <br />evaluated the properties of the onsite soils to assess the suitability in these different uses. <br />Drainage <br />As discussed in the sections on drainage and climatological factors, the landfill drainage <br />design is influenced by the constraints of the surrounding environment (topography, <br />rainfall, evaporation, etc.). <br />The original facility layout was prepared by San Joaquin County staff and under the supervision <br />of Gabriel R. Karam, PE (RCE C33172). The design of Module 1 was prepared by Mr. <br />Frederick W. Cope, PE (RCE C19691). Future designs will also be prepared under the direction <br />of a registered civil engineer, and will accommodate the service area, climatological factors, <br />physical setting, soils, and drainage. This will be accomplished with fill sequencing, traffic <br />routing, stormwater facilities, and use of on-site soils. In addition, the design will accommodate <br />use by the general public (also see Chapter 7 — Landfill Operations). <br />6.2. DESIGN PLANS <br />6.2.1. Previous Designs <br />• Module "I": an unlined approximately 80 -acres, located in the center portion of the <br />existing Foothill site. Wastes were placed from 1965 through 2003. Closure of the crest <br />of Module "I" is anticipated in 2006. <br />• Module 1: a lined approximately 34 -acres designed to meet Class III landfill standards, <br />located south of Module "I". Module 1 was completed in 2003. This module and all <br />Foothill Sanitary Landfill Page 31 of 62 Public Works/Solid Waste <br />JTD County of San Joaquin — Revised 10/6/05 <br />