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r <br />u <br />C <br />C <br />0 <br />L <br />LJ <br />I <br />LiI <br />�7 <br />F <br />Groundwater level measurements recorded at a well within one mile of the site indicate an <br />approximate drop of 13 feet from 1959 to 1985. Groundwater level measurements <br />recorded at on-site monitoring wells indicate an approximate decrease in elevation of 10 <br />feet from 1990 to 2003. The permeability of the soils from the surface to a depth of 60 feet <br />varies from 10-3 to 10-9 centimeters per second. <br />C. Locations of buildings and structures relative to the migration monitoring perimeter do not <br />require special design features in the soil gas wells. All structures within the landfill <br />property limit are also within the monitoring perimeter, and therefore will be monitored as <br />"on-site" structures (Figure 1). <br />D. Adjacent land use and inhabitable structures within 1000 feet of the disposal site property <br />boundary does not require special design features. <br />- The adjacent lands are used for agriculture livestock grazing. <br />- No inhabitable structures are within 1000 feet of the disposal site, except for: <br />1. The residence 700 feet north of the northern property boundary, <br />approximately 3,000 feet from the monitoring perimeter. <br />2. The residence 125 feet west of the western property boundary, <br />approximately 3,050 feet from the monitoring perimeter. <br />E. Man-made pathways, such as underground construction do not exist. <br />F. The soil gas wells are located outside the limit of refuse. <br />G. Wells were bored at least the elevation of the bottom of the waste within 1000 feet of the <br />well. <br />On-site Structure Monitoring <br />Occupiable structures within the interim monitoring perimeter will be monitored for methane gas <br />concentration. These structures and their monitoring points of compliance include: <br />A. Scalehouse: <br />- Interior air <br />- Electrical conduit entry point within the building <br />B. Maintenance building: <br />- Interior air <br />- Electrical conduit entry point within the building <br />C. Manager's Residence: <br />- Crawl space below building <br />Electrical conduit entry point within the building <br />Foothill Landfill Methane Monitoring 2 Public Works/Solid Waste <br />September 15, 2003 County of San Joaquin <br />