CULVERT INSTALLATION Sample Clauses

CULVERT INSTALLATION. As noted previously, the till surface elevation at the borehole locations ranges from a low of el. 15.08 at BH- 02 to a high of el. 15.18 m at BH-01. In view of the loose and potentially compressible nature of the topsoil, it is recommended that the topsoil layer be removed from below the replacement culverts. The excavation should extend downward to the till surface and outward a minimum horizontal distance equal to the depth of new pipe bedding. Based on the conditions encountered at the boreholes, it is expected that approximately 700 mm (+/-) of Class A gravel bedding material will be required to establish the specified invert elevations, following topsoil removal. To ensure stable bearing conditions, the bedding should extend outward from the perimeter of the new culverts a horizontal distance at least equal to the depth of bedding placed below the pipes. Excavation to the required level should be possible with conventional earth moving equipment (i.e., large backhoe or excavator). Final excavation to the till surface should be undertaken with a ditching type bucket (i.e., no teeth) so as to minimize disturbance of the till surface. Some temporary lowering of the groundwater table may be necessary to minimize disturbance of the till surface prior to placement of the gravel bedding. Control of groundwater inflow may require pumping from a sump(s) located below the required depth of excavation. A temporary stream diversion may also be required depending on the design details for the new structure. Depending on the insitu conditions encountered, the use of a clean (i.e., no fines) granular bedding layer (e.g., 20 mm concrete stone) could be considered in place of the proposed Class A gravel. Such a granular layer should also assist with the groundwater control. The use of a non-woven geotextile should be used in conjunction with clean granular bedding, to prevent the migration of fines into (or through) the granular layer. The bedding layer (Class A gravel or clean granular fill) should be placed and compacted in lifts; maximum lift thickness should be compatible with the compaction equipment selected for use.

CULVERT INSTALLATION. Culvert installation must be in accordance with the CULVERT AND DRAINAGE SPECIFICATION DETAIL and the Corrugated Polyethylene Pipe Association’s “Recommended Installation Practices for Corrugated Polyethylene Pipe and Fittings”.

CULVERT INSTALLATION. Culvert installation must be in accordance with the CULVERT AND DRAINAGE SPECIFICATION DETAIL, LIVE STREAM INSTALLATION PROCEDURE DETAIL, the National Corrugated Metal Pipe Association’s "Installation Manual for Corrugated Steel Drainage Structures", and the Corrugated Polyethylene Pipe Association’s “Recommended Installation Practices for Corrugated Polyethylene Pipe and Fittings”. Corrugated Polyethylene pipe must be installed in a manner consistent with the manufacturer’s recommendations.

CULVERT INSTALLATION. 2.37.1 If the project is located in a moderate to very high Fire Hazard Severity Zone as designated by CAL FIRE, culvert materials should consist of corrugated metal pipe (CMP). Use of High-Density Polyethylene (HDPE) pipe is not recommended. 2.37.2 Existing fill material in the crossing shall be excavated down vertically to the approximate original channel and outwards horizontally to the approximate crossing hinge points (transition between naturally occurring soil and remnant temporary crossing fill material) to remove any potential unstable debris and voids in the older fill prism. 2.37.3 Culvert shall be installed to grade (not perched or suspended), aligned with the natural stream channel, and extend lengthwise completely beyond the toe of fill. If culvert cannot be set to grade, it shall be oriented in the lower third of the fill face, and a downspout or appropriately-sized energy dissipator (e.g., boulders, riprap, or rocks) shall be installed above or below the outfall as needed to effectively prevent stream bed, channel, or bank erosion (scouring, headcutting, or downcutting). The Permittee shall ensure basins are not constructed, and channels shall not be widened at culvert inlets. 2.37.4 Culvert bed shall be composed of either compacted rock-free soil or crushed gravel. Bedding beneath the culvert shall provide for even distribution of the load over the length of the culvert and allow for natural settling and compaction to help the culvert seat into a straight profile. The crossing backfill materials shall be free of rocks, limbs, or other debris that could allow water to seep around the culvert and shall be compacted. 2.37.5 Culvert inlet/outlet (including the outfall area) and fill faces shall be armored where stream flow, road runoff, or rainfall energy is likely to erode fill material and the outfall area. 2.37.6 Permanent culverts shall be sized to accommodate the estimated 100-year flood flow (i.e., ≥1.0 times the width of the bankfull channel width or the 100- year flood size, whichever is greater), including debris, culvert embedding, and sediment loads.

CULVERT INSTALLATION. Culvert, downspout, flume and energy dissipator installation must be in accordance with the CULVERT AND DRAINAGE SPECIFICATION DETAIL and the Corrugated Polyethylene Pipe Association’s “Recommended Installation Practices for Corrugated Polyethylene Pipe and Fittings”. Corrugated Polyethylene pipe must be installed in a manner consistent with the manufacturer’s recommendations.

CULVERT INSTALLATION. As an alternative to and in addition to any provisions provided in the Statutes of the State of Kansas for the construction, alteration or reconstruction of culverts in the City, the City may install a culvert at the request of a property owner under the following conditions: 1. The property owner shall have purchased the required sized culvert and shall be responsible for having it delivered to the point of installation. 2. The property owner shall be responsible for and have removed all hard surface material from above the existing culvert from the owner's property line to the edge of the existing road.

CULVERT INSTALLATION. Culvert installation must be in accordance with the CULVERT AND DRAINAGE SPECIFICATION DETAIL. Culverts shall be banded using lengths of no less than 10 feet, and no more than one length less than 20 feet. Shorter section of banded culvert shall be installed at the inlet end.

CULVERT INSTALLATION. See Exhibit E of the contract for “Culvert Specifications” and “Culvert List.” Non-Project Roads. Road improvement and construction not required by this section but approved in the Operations Plan shall be subject to the following requirements, unless otherwise approved in writing by STATE:

CULVERT INSTALLATION. In view of the random and potentially compressible nature of the existing fill, it is recommended that excavation for the replacement culvert extend to the underlying till or bedrock surface. Since excavation to this level will extend below the groundwater table, it may be advantageous to also remove the thin (150 mm +/-) layer of till, if water disturbance/softening becomes an issue. In any case, some temporary lowering of the groundwater table may be necessary to facilitate the installation and backfilling of the replacement culvert. Control of groundwater inflow may require pumping from a sump(s) located below the required depth of excavation. A temporary stream diversion could also be considered depending on the design details and alignment selected for the new culvert. It is understood that Granular Class A gravel is typically utilized for pipe bedding. Depending on the insitu conditions encountered with regard to water inflow, the use of a clean (i.e., no fines) granular bedding layer (e.g., 20 mm concrete stone) could be considered in place of the Class A gravel. Such a granular layer should also assist with groundwater control. The use of a non-woven geotextile should be used in conjunction with clean granular bedding, to prevent the migration of fines into (or through) the granular layer. The bedding layer (Class A gravel or clean granular fill) should be placed and compacted in lifts; the maximum lift thickness should be compatible with the compaction equipment selected for use. It is expected that most of the excavated fill will not be suitable for reuse as culvert backfill due to its random nature, elevated moisture contents, and the presence of wood.