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TABLE 1 PROPOSED BORING OBJECTIVES Mountain House Development,Mountain House Site#4 and Site#5 Mountain House,California Target Proposed Maximum Boring Area of Sample Sample Depths Depth Depth HHRA ID Investigation Media (feet) (feet) (feet) Soil Sample' Mountain House Site 44 MI-14-1 South of Byron Road;area of affected soil s/s,Jggw,, 10-15 25 35 yes M114-24 South of Byron Road;SE of affected area soil 10-15 25 35 no MH4-34 South of Byron Road;NW of affected area soil 10-15 25 35 no M114-4 South of Byron Road;up gradient of affected area s/ggw 10-15 25 35 yes MH4-5 South of Byron Road;up gradient of affected area s/ggw 10-15 25 35 yes M114-6 North of Byron Road;down gradient of affected area s/ggw 10-15 25 35 yes MI-14-7 North of Byron Road;down gradient of affected area s/ggw 10-15 25 35 yes MH4-85 South of Byron Road;up gradient of affected area s/ggw 10-15 25 35 no MH4-95 South of Byron Road;up gradient of affected area s/ggw 10-15 25 35 no Mountain House Site#5 MI-15-1 South of Byron Road;area of affected soil s/slggw,. 10-15 25 35 yes MH5-26 South of Byron Road;NW of affected area soil 10-15 25 35 no MH5-36 South of Byron Road;SE of affected area soil 10-15 25 35 no M1-15-4 South of Byron Road;up gradient of affected area s/ggw 10-15 25 35 yes M115-5 South of Byron Road;up gradient of affected area s/ggw 10-15 25 35 yes MI5-6' South of Byron Road;up gradient of affected area s/ggw 10-15 25 35 no MH5-7' South of Byron Road;up gradient of affected area s/ggw 10-15 25 35 no MH5-8 North of Byron Road;down gradient of affected area s/ggw 10-15 25 35 yes MI-15-9 North of Byron Road;down gradient of affected area s/ggw 10-15 25 35 yes Abbreviations: bgs=bellow ground surface HHRA=Human Health Risk Assessment Boring s/s,/ggw„=soil/soil vertical/grab groundwater sample vertical s/ggw=soil/grab groundwater sample Notes: 1.Target sample depth based on previous identified zone of contamination 2. Maximum depth explored may vary in field. 3. Soil samples for HHRA to be collected from the upper 10 feet of borehole. 4. If affected soil is observed below 20 feet bgs in MH4.1,then contingency borings MH4-2 and MH4-3 will be advanced. 5. If affected soil is observed in boring MH4-4 and MH4-5,then contingency borings M114-8 and MI-14-9 will be advanced. 6. If affected soil is observed below 20 feet bgs in boring MH5-1,then contingency borings MI-15-2 and M115-3 will be advanced. 7. If affected soil is observed in boring MH54 and MH5-5,then contingency borings MH5-6 and MH5-7 will be advanced. Page 1 of I