4-22 Do not place mater ial in a stream without approval by the Engineer . Remove materials placed
within the stream area and leave the stream in its original condition, unless otherwise permitted by the Engineer .
412-3 Utilization of Excavated Material
Use and place suitable excavated material in accordance with Articles 410 -7 and 410- 8. Notify the Engineer a sufficient time before beginning the excavation so measurements may be taken of the undisturbed ground.
412-4 Measurement and Payment
The price and payment below will be full compensation for all items required to complete unclassified structure excavation inc luding , but not limited to, those items contained in
Article 412 — 1.
Unclassified Structure Excavation at Station __ __ will be paid at the contract lu mp sum price. Payment will be made under: Pay Item Pay Unit Unclassified Structure Excavation at Station ____ Lump Sum
414-1 Description
Excavate all material necessary for the construction of box culverts with floor slabs in accordance with the contract or as directed by the Engineer . Excavate, blast, drain and divert water, bail, pump, brace, shore, provide sheeting, cribbing, cofferdams, culvert foundation conditioning, subsurface drainage and drawings; backfill, haul and dispose of materi als. Do not deposit excavated materials, nor construct earth dikes or other temporary earth structures in rivers, streams or impoundment or so near to such waters that they are carried into any river, stream or impoundment by stream flow or surface runoff. As an exception to the above, obtain written approval from the Engineer for the use of confined earth materials in cofferdams for structure foundations.
414-2 Materials
Refer to Division 10. Item Section Select Material s 1016 Subsurface Drainage Materials 1044 Use Class V or VI select material for foundation conditioning material.
414-3 Foundation Excavation
Notify the Engineer a sufficient time before beginning the excavation so measurements may be taken of the undisturbed ground. Do not disturb the existing ground at the culvert site without permission by the Engineer . Where necessary for safety, slope, shore, brace or protect by cofferdams the foundation openings in accordance with State and local safety standards. Perform foundation excavation and r elated work in such sequence that no portion of the culvert will be endangered by subsequent operations. Protect completed portions of a culvert from blasting. Remove and dispose of boulders, vegetative matter and any other objectionable material.
4-23 Notify the Engineer after excavating each foundation. Do not place any concrete until obtaining
approval of the excavation depth, the character of the foundation material and permission to proceed. Take special care not to disturb the bottom of the excavation until immediately before placing foundation conditioning material .
414-4 Conditioning Culvert Foundation
Excavate below the bottom of the barrel or wing footing to a depth as dir ected by the Engineer and replace the excavated material with foundation conditioning material . When the foundation material beneath a portion of the barrel or wing footing is rock or incompressible material and softer material is beneath the remainder of the barrel or wing footing, excavate the rock material within the neat lines of the barrel or footing to a depth of 12 inches below the bottom of the barrel and footings and backfill with foundation conditioning material.
414-5 Pumping
Pump from the interior of any foundation enclosure to preclude the possibility of the movement of water over or through any fresh concrete. Do not pump while placing concrete or for at least 24 hours thereafter, unless done from a suitable sump separated from the concrete work by a substantially watertight wall.
414-6 Utilization of Excavated Material
Use suitable excavated material in accordance with Article 410 -7.
414-7 Backfilling and Filling
As soon as practical after completing the box culvert, place the backfill and redirect the stream through the culvert. Use approved material for b ackfill that is free from large or frozen lumps, wood or other undesirable material. Where there is not an adequate quantity of suitable backfill material available from culvert excavation, provide suitable backfill material compensated in accordance with Suba rticle 410 -10(C) . Eliminate any excavated slope adjacent to backfill areas by stepping or serrating to prevent wedge action. Place and compact all portions of the backfill that become a part of roadway typical sections or their foundations in accordance with Subarticle s 235-3(B) and 235- 3(C). Place all other portions of the backfill in layers not more than 10 inches in depth of loose measure and compact to a density comparable to the adjacent undisturbed material. Refill all excavated spaces not filled with permanent work with earth up to the ground surface existing before the excavation. Place backfill or embankment material simultaneously to approximately the same elevation on both sides of the culvert. Do not place backfill or embankment behind the walls of culverts to an elevation higher than one foot above the top of footing or bottom slab until after placing the top slab and until the concrete develops the minimum required strength for the class of concrete specified as listed in Table 1000 -1.
414-8 Subsurface Drainage At Weep Holes
Cover weep holes with hardware cloth and p lace a stone drain consisting of 1 cubic foot of subdrain coarse aggregate (standard size No. 78M) contained in a bag of Type 1 geotextile at each weep hole. Place subdrain fine aggregate beneath, around and over the stone drain, so the drain is covered by a layer of subdrain fine aggregate at least 1 foot thick. Connect all drains with a horizontal drain of subdrain fine aggregate at least 1 foot square in cross section. In the case of abutments and retaining walls, in addition to the above requirements, place a vertical