Page 



Systematic Impact and Methods Assessment 148 



Coastal Uplands 149 



Seismic Preexploration 149 



Access to Site 152 



Wellsite Preparation and Operation 156 



Installation and Maintenance of Lines 160 



Placement and Operation of Production Facilities 166 



Spills and Cleanup 169 



Site Shutdown and Restoration 172 



Salt Marsh 175 



Seismic Preexploration 175 



Gravity Preexploration 177 



Site Access by Leveed Road 179 



Site Access by Canal and Wellsite Dredging 183 



Wellsite Preparation and Operation for Leveed Marsh 



Floor Locations 187 



Installation and Maintenance of Lines 191 



Placement and Operation of Production Facilities 196 



Spills and Cleanup 199 



Site Shutdown and Restoration 202 



Brackish Marsh 206 



Seismic Preexploration 206 



Gravity Preexploration 208 



Site Access by Leveed Road 210 



Site Access by Canal and Wellsite Dredging 214 



Wellsite Preparation and Operation for Leveed 



Marsh-Floor Locations 218 



Installation and Maintenance of Lines 221 



Placement and Operation of Production Facilities 228 



Spills and Cleanup 231 



Site Shutdown and Restoration 235 



Fresh Marsh 238 



Seismic Preexploration 238 



Gravity Preexploration 240 



Site Access by Leveed Road 242 



Site Access by Canal and Wellsite Dredging 245 



Wellsite Preparation and Operation for Leveed 



Marsh-Floor Locations 249 



Installation and Maintenance of Lines 251 



Placement and Operation of Production Facilities 257 



Spills and Cleanup 261 



Site Shutdown and Restoration 265 



Delta Marsh 268 



Seismic Preexploration 268 



Gravity Preexploration 270 



Site Access by Canal and Wellsite Dredging 272 



Dredged Wellsite Operation 276 



Installation and Maintenance of Lines 277 



Placement and Operation of Production Facilities 284 



Spills and Cleanup 288 



Site Shutdown and Restoration 291 



IX 



