| OCR Text |
Show , South. However, generally the action does not include residential properties unless the property is adjacent to or inherently part of the channel, flood plain, or alluvial fans and concentrations of lead in ,the soil' exceed the action level. The action requires the removal of soil containing lead at concentrations greater than 2, 000 mg/Kg or to depths generally not to exceed 3 feet in the channel and'placing an adequate cover over contaminated areas to and prevent exposure continued migration of contaminated soil. The channel will be regraded with clean fill from either the banks of the channel or from an off-site borrow source. Specific elements of the response action are described in more detail below. A. Channel Area: response action calls for removing soil containing concentrations greater than 2,000 mg/Kg, from the channel, and placing an adequate cover over contaminated areas to prevent exposure. The channel will be regraded with clean fill from either the banks of the channel or from an off-site source. The lead removal depths will depend on conditions and channel contaminant depth; the removl generally, depth will not exceed three feet, except in limited areas where Soil . a.n the of deep deposits may be effectively The lateral extent of soil removal removed. will generally be limited to the channel banks and flood with lead undeveloped plain concentrations in excess of 2,000 mg/Kg. pockets 2. Channel grade and contours will be restored, and soil fill, will have sufficient clay to content prevent erosion, due to normal runoff flow and 100 year flood events.in te channel. Restoration of the channel must be based on appropriate designs f,or, open channel flow. ' , 3. Vegetation necessary will to be re-established restore the where and ,landscape stabilize the channeL, 4. Culverts,' spillways, or other systems necessary. 4 rip.-rap, stilling basins will be installed as |
