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TABLE 1 PROPOSED BORING OBJECTIVES MOUNTAIN HOUSE DEVELOPMENT SITE#6 Tracy,San Joaquin County,California Target Proposed Sample Total Water Boring Area of Sample Depth' Depth' HHRA Quality Description Investigation/Purpose Media (feet bgs) (feet bgs) Sample" Testing SB-A Investigate extent of affected media up gradient of GP 152 s/gw 5 to 28 28 Yes No SB-B Investigate extent of affected media cross gradient of GP 152 s/gw 5 to 28 28 Yes No SB-C Investigate extent of affected media immediately down gradient of GP 152 s/gw 5 to 28 28 Yes No SB-D Investigate extent of affected media cross gradient of GP 152 s/gw 5 to 28 40 Yes No SB-E Investigate source,magnitude,and extent of affected media at GP 152 s/gw 7 to 20 20 Yes No SB-F Investigate extent of affected media up gradient of GP 156 s/gw 5 to 28 28 Yes No SB-G Investigate extent of affected media cross gradient of GP 156 s/gw 5 to 28 28 Yes No SB-H Investigate extent of affected media cross gradient of GP 156 s/gw 5 to 28 28 Yes No SB-I Investigate source,magnitude,and extent of affected media at GP 156 s/gw, 12 to 20 20 Yes No SB-J Investigate extent of affected media up gradient of GP 157 and GP 158 s/gw 5 to 28 28 Yes Yes SB-K Investigate extent of affected media immediately down gradient of GP 157 s/gw 5 to 28 28 Yes No SB-L Investigate extent of affected media immediately down gradient of GP 158 s/gw 5 to 28 28 Yes No SB-M Investigate extent of affected media immediately down gradient of GP 160 s/gw 5 to 28 28 Yes No SB-N Investigate extent of affected media cross gradient of GP 160 and GP 161 s/gw 5 to 28 28 Yes No SB-O Investigate extent of affected media cross gradient of GP 161 s/gw 5 to 28 28 Yes No SB-P Investigate extent of affected media up gradient of GP 161 s/gw 5 to 28 28 Yes No SB-Q Investigate source,magnitude,and extent of affected media at GP 161 s/gw 15 to 20 20 Yes No SB-R Investigate extent of affected media down gradient of GP 152 s/gw 5 to 28 28 Yes Yes SB-S Investigate extent of affected media down gradient of GP 152 s/gw 5 to 28 28 Yes Yes SB-T Investigate extent of affected media down gradient of GP 156 s/gw 5 to 28 28 Yes No SB-U Investigate extent of affected media down gradient of GP 156 and GP 157 s/gw 5 to 28 28 Yes No SB-V Investigate extent of affected media down gradient of GP 157 and GP 158 s/gw 5 to 28 28 Yes No SB-W Investigate extent of affected media down gradient of GP 158 s/gw 5 to 28 28 Yes No SB-X Investigate extent of affected media down gradient of GP 160 s/gw 5 to 28 28 Yes No SB-Y Investigate pextent of affected media down gradient of GP 161 s/gw 5 to 28 28 Yes No SB-Z Investigate extent of affected media down gradient of GP 161 s/gw 5 to 28 28 Yes No SB-AA Investigate extent of affected media up gradient of GP 160 s/gw 4 to 28 28 Yes No Abbreviations: bgs=Below ground surface s=Soil sample gw=Groundwater sample HHRA=Human Health Risk Assessment SB=Soil boring Notes: I. The lettering system A through Z is for descriptive purposes only;actual boring designations will be determined in the field. 2. Target soil-sample depth based on previously identified zone of contamination,or on static groundwater levels measured in adjacent,affected borings. 1 Maximum depth explored may vary in field. 4. Soil samples for HHRA to be collected from(1)most affected interval;or(2)if no affected soil,from 5 feet bgs. A single sample interval may satisfy HHRA and j p delineation purposes. -T^/C7 Page I of I Frov Sc nce to&sWonc