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Borehole Log and Monitoring Well Construction Summary Austin Road Landfill, Manteca, California Page 2 2.0 DRILING AND CONSTRUCTION DETAILS 2.1 Borehole Drilling During the drilling phase of this project, four boreholes were drilled and monitoring wells installed. The following table, Table 2, provides a reference for the details of each borehole. Monitoring Well As-Built diagrams further describe the details and materials associated with each monitoring well completion (Appendix A). Figure 1 illustrates the well locations. Table 2 Borehole Details Borehole/Monitoring Drilling Borehole Total General Location Well ID Dates Diameter Depth Approximately 2700 ft east of Newcastle AMW-13B 11/14-17/2008 8 inch 139 ft bgs Rd.along southern NCYCC outer security perimeter road. Approximately 500 ft east of Newcastle AMW-21 11/4-12/2008 8 inch 141 ft bgs Rd.along southern NCYCC outer security perimeter road. Approximately 500 ft south of NCYCC AMW-22 12/1-4/2008 8 inch 139 ft bgs sewage lift station between the two south correctional pods. Approximately 100 ft west of center AMW-23 11/19-20/2008 8 inch 184 ft bgs point access gate along the eastern NCYCC security perimeter fence. 2.2 Stratigraphy Soil sampling for each borehole was conducted as follows: AMW-1313: 18 inch hammer driven split-spoon soil sampling began after 75 feet of borehole had been drilled and continued every 5 feet throughout the remainder of the borehole. Continuous logging of cuttings for the remainder of the borehole also commenced after 75 feet of drilling. AMW-21: 18 inch hammer driven split-spoon soil sampling began at the ground surface and continued every 5 feet throughout the remainder of the borehole. Continuous logging of cuttings also commenced at ground surface. AMW-22: 18 inch hammer driven split-spoon soil sampling began after 75 feet of borehole had been drilled and continued every 5 feet throughout the remainder of the borehole. Continuous logging of cuttings for the remainder of the borehole also commenced after 75 feet of drilling. AMW-23: 18 inch hammer driven split-spoon soil sampling began after 75 feet of borehole had been drilled and continued every 5 feet throughout the remainder of the borehole except for the following depth ranges which were logged by cuttings only; 150-155, 160-170, and 175-185 due to consistent geology. Continuous logging of cuttings for the remainder of the borehole also commenced after 75 feet of drilling.