ARCHIVED REPORTS_WELL COMPLETION REPORT MW 4495D AND MW 4505D 20130301

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' former South Yard. Exploratory borings drilled at the MW-449D and MW-450D locations characterized the intermediate zone as fine silty sand with some clay from ' approximately 110 ft bgs to 140 ft bgs to a well-graded fine to coarse sand from 140 ft bgs to 170 ft bgs. The hydraulic conductivity in the intermediate zone beneath the South Yard ranges from approximately 60 ft/day to 240 ft/day. ' 3.0 Well Locations Wells MW-4495 and MW-449D were installed approximately 100 feet southeast of well MW-103 in the North Yard(Figure 2). The wells were offset by approximately 10 feet from each other. The wells are located in San Joaquin County APN 143-310-07. ' Wells MW-450S and MW-450D were installed approximately 115 feet southwest of the nested wells MW-447S and MW-447D in the South Yard(Figure 2). The wells were offset by approximately 10 feet from each other. The wells are located in San Joaquin County APN 159-020-10. ' 4.0 Well Permits Well permits for the construction of the two monitor well pairs(4 wells total) were issued by the San Joaquin County Environmental Health Department on June 21, 2012 ' (Appendix A). Permit#SR0065155 was issued for the installation of wells MW-4505 and MW-450D in the former South Yard(APN 159-020-10). Permit#SR0065156 was issued for the installation of wells MW-4495 and MW-449D in the North Yard (APN ' 143-310-07). 5.0 Drilling Prior to initiating drilling, each well location was marked with white paint and Underground Services Alert(USA) contacted approximately one week prior to drilling. USA notified utility companies in the area of the upcoming drilling activity. No potential conflicts with underground utilities were identified by the utility companies. Additionally, the top five feet of each boring was cleared using a hand auger as an additional precaution to avoid underground utilities. Exploratory borings were drilled at the MW-449D and MW-450D locations using a Versa-Drill V-100M Gefco mud rotary drill rig. The drill bit was a 10-7/8 inch diameter mud rotary drill bit. The drilling mud was Baroid Quick-Gel. Typical mix was 3 50-lbs. Quick-Gel sacks per 1000 gallons of potable water. Drill cuttings brought to land surface were logged by Steve Dickey, CHG. The lithology was characterized using the Unified Soil Classification System(USCS) according to ASTM D 2488-90, which is the Standard Practice for Description and Identification of Soils (Visual-Manual Procedure). Field and final lithologic logs are presented in Appendix B. ' 5.1 Exploratory Boring for Well MW449D The exploratory boring for well MW-449D was drilled on June 29, 2012. The ' diameter of the borehole was 10-7/8 inches. The lithology encountered from ground Well Completion Report for Monitor Well Pairs MW-449 and MW-450 7128-9 SPX Cooling Technologies Dudek Stockton,California Page 2 January 2013