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1.01 PURPOSE The purpose of this work plan is to present the procedures to install Perimeter LFG Migration Monitoring Wells at the North County Recycling Center and Sanitary Landfill (NCRCSL). The purpose of the work is to provide shallow (10 feet deep) subsurface migration monitoring on the eastern side of the landfill property where seasonal saturation reduces the availability of the shallow probe of monitoring well SG -16. 1.02 SITE DESCRIPTION The NCRCSL is located at 17720 East Harney Lane, approximately nine miles east of Lodi. Land uses within 1,000 feet of the facility are primarily agricultural, residential, and livestock grazing. The NCRCSL is a single solid waste management unit, designated Class III, accepting non- hazardous municipal solid waste and inert waste. 1.03 REASON FOR INSTALLING NEW PERIMETER MONITORING WELLS Difficulty in taking a measurement at the shallow probe of perimeter migration monitoring well SG -16 is apparently due to saturated soils in the that probes sampling interval (to a depth of 10 feet). This saturation is apparently caused by the seasonal water flow in the creek immediately south of that well (Figure 1). Although soil saturation prevents offsite migration, our investigation indicates that this condition may be local, and that soil north and south of the creek may not be saturated. The intermediate and deep probes (monitoring to a depth of 80) appear to function properly. Data from these probes and from the other 19 migration monitoring wells indicate that our monitoring perimeter is free of combustible gas. Land use within several thousand feet of our property boundary is agricultural. The new wells will be located north and south of well SG -16, near the property boundary Distances between these wells and wells installed in 2009 are less than 1000 feet (Figure 1). � us EMORT=i11 Installation of these wells is tentatively scheduled for April 26, in conjunction with the re -drill and installation of groundwater monitoring well G-1, the permit for which has been granted by EHD. Installation of the two shallow probe wells is conditional upon receipt of a drilling permit and acceptance of this Work Plan by EHD for those wells. Work Plan SG -16 Shallow Replacement Wells San Joaquin County North County Sanitary Landfill Page 1 of 5 Public Works Department Solid Waste Division