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L' <br />F <br />L <br />u <br />C1 <br />0 <br />11 <br />0 <br />11 <br />0 <br />I I <br />I I <br />C' <br />A. Local Soil And Rock Conditions <br />From past soil gas well installation projects, it has been found that local soil and <br />rock conditions do not require special design features for the soil gas wells. The <br />materials beneath the landfill consist of alluvial sediments. The soils in the upper <br />100 feet are primarily silty sands, clayey sands, and clayey sands with occasional <br />silt and clay interbeds. From 100 feet to 215 feet, the materials generally consist <br />of sands and gravelly sands. The sampling intervals of soil gas wells will be <br />adjusted to address unforeseen soil conflict found during drilling. During well <br />installation, sand lens layers will not be blocked. <br />B. Hydrogeologic Conditions <br />Hydro geologic conditions at the disposal site do not require special design <br />features in the soil gas wells. Groundwater elevation ranges from -30 to -42 feet <br />MSL (145 feet to 157 feet below ground surface), fluctuating seasonally <br />approximately 6 feet. The groundwater is unconfined. <br />C. Locations of Buildings and Structures Relative To The Migration Monitoring <br />Perimeter <br />The monitoring perimeter has been established to exclude the Martin residence <br />and other structures located in the northeast corner of our property, thereby <br />designating those structures as "off site" with regard to subsurface LFG migration <br />monitoring. These structures are excluded to avoid the need to monitor the interior <br />of those structures and disturbance of the residents. Structures inside the <br />perimeter monitoring boundary, such as the Scale house, Recycling Center, Office <br />and Maintenance shop, and Pump house, are on-site structures. <br />D. Adjacent Land Use and Inhabitable Structures Within 1000 feet of the disposal Site <br />Land uses within 1,000 feet of the facility are primarily agricultural and livestock <br />grazing (Figure 1). <br />E. Man -Made Pathways <br />There are no man made pathways for the transmissions of landfill gas off-site. <br />F. Nature, Age of Waste and Potential to Generate Landfill Gas (LFG). <br />NCRCSL was opened in 1991 and since then refuse has been disposed at the site <br />annually. Special design features are not required in the monitoring perimeter soil <br />gas wells based on the type of refuse disposed. To extract LFG and prevent LFG <br />migration along with surface emissions, a LFG collection and control system was <br />installed at the site in 2006. <br />North County Recycling Center And Sanitary Landfill <br />Landfill Gas Monitoring Plan <br />County of San Joaquin <br />Department of Public Works <br />Solid Waste Division <br />