A.
Embankment.
Furnish embankment material which is obtained from roadway, borrow, channel and/or structural excavations. Embankment material shall be obtained only from an approved source and shall meet the approval of the Engineer or the designated representative of the Engineer. In general, embankment material shall consist of earth that is free from rocks, clods, vegetation or other foreign material. Each layer of embankment shall be uniform as to material, density and moisture content and shall be suitable for forming a stable embankment. Other requirements, if any, for embankment material shall be as shown on the plans.
B.
Backfill.
Furnish backfill material in accordance with plan requirements. Backfill material shall be obtained only from an approved source and shall meet the approval of the Engineer or the designated representative of the Engineer. Obtain approved backfill material from roadway, borrow, channel and/or structural excavations.
C.
Subgrade Material.
Use existing subgrade material, or when necessary furnish subgrade material, which contains sufficient fines to form a firm subgrade capable of being shaped and compacted to the lines, grades and densities shown on the plans.
1.
Lime Stabilization.
If required, lime stabilization of subgrade shall be in accordance with Section 02244, Lime Stabilization of Materials in Place.
2.
Cement Stabilization.
If required, cement stabilization of subgrade shall be in accordance with Section 02242, Cement Stabilization of Materials in Place.
D.
Topsoil.
Furnish topsoil material that is capable of sustaining vegetation. All topsoil material and the source from which it comes shall meet with the approval of the Engineer or the designated representative of the Engineer and shall be obtained from roadway, borrow, channel and/or structural excavations. When acceptable to the Engineer or the designated representative of the Engineer, the top four (4) inches of roadway, channel and structural excavations shall be stripped and separately stockpiled for later use as topsoil. When the Engineer or the designated representative of the Engineer determines that the top four (4) inches of roadway, channel and/or structural excavations do not provide the necessary material for sustaining vegetation OR if there is insufficient topsoil material, then topsoil shall be obtained from an approved borrow source. All existing large vegetation or other unsuitable material shall be removed from topsoil before it is stockpiled or transported.
(Ordinance 2007-106, App. B, adopted 3/20/07)