806.1 Erosion Control Measures - Revision history

Legged1: /* 806.1.7 Temporary Seeding */ decoupled mulching from seeding

2022-09-15T13:20:59Z

806.1.7 Temporary Seeding: decoupled mulching from seeding

← Older revision		Revision as of 08:20, 15 September 2022
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	===806.1.7 Temporary Seeding===		===806.1.7 Temporary Seeding===

	This work shall consist of preparing and fertilizing a seedbed, furnishing and sowing of seed~~, and mulching~~. The purpose of temporary seeding ~~and mulching~~ is to produce a quick ground cover to reduce erosion in disturbed areas that are expected to be re-disturbed at a later date or if groundcover needs to be established in non-favorable seeding seasons.		This work shall consist of preparing and fertilizing a seedbed and furnishing and sowing of seed. The purpose of temporary seeding is to produce a quick ground cover to reduce erosion in disturbed areas that are expected to be re-disturbed at a later date or if groundcover needs to be established in non-favorable seeding seasons.

	====806.1.7.1 Design Considerations====		====806.1.7.1 Design Considerations====

	Temporary seeding will be a critical component of temporary stabilization for projects with land disturbance. Temporary seeding shall follow Sec 806.50 and mulching shall be included as a separate bid item in accordance with Sec 802. Temporary Seeding should be provided for 100% of areas that will be seeded with Warm Season grasses. This is necessary because, per Sec 805.3.1.2, warm season grass seeding is restricted to the period from Oct. 15 through April 15, and the SWPPP disallows postponement of seed/mulch following grading. If the project includes special provisions that requires any warm-season grass areas to be graded after Oct. 15, but prior to Spring, then those areas can be excluded from Temporary Seeding. Any quantity of Temporary Seeding needed for temporary staged construction should also be provided. A quantity for Mulching should also be provided for all areas of Temporary Seeding. Warm season grass areas that are temporarily seeded and subsequently overseeded after Oct. 15 do not require a second application of mulching.		Temporary seeding will be a critical component of temporary stabilization for projects with land disturbance. Temporary seeding shall follow Sec 806.50 and mulching shall be included as a separate bid item in accordance with Sec 802. Temporary Seeding should be provided for 100% of areas that will be seeded with Warm Season grasses. This is necessary because, per Sec 805.3.1.2, warm season grass seeding is restricted to the period from Oct. 15 through April 15, and the SWPPP disallows postponement of seed/mulch following grading. If the project includes special provisions that requires any warm-season grass areas to be graded after Oct. 15, but prior to Spring, then those areas can be excluded from Temporary Seeding. Any quantity of Temporary Seeding needed for temporary staged construction should also be provided. A quantity for Mulching should also be provided for all areas of Temporary Seeding. Warm season grass areas that are temporarily seeded and subsequently overseeded after Oct. 15 do not require a second application of mulching.

	Temporary Seeding is not required for areas that are designated to receive Cool Season grass seeding. Per Sec 805.3.1.1, either full or partial cool season seeding is required immediately following grading, regardless of the season. Overseeding of cool season seeded areas may also be required depending on when the original seeding occurred (see Sec 805.3.1.1 for overseeding requirements).		Temporary Seeding is not required for areas that are designated to receive Cool Season grass seeding. Per Sec 805.3.1.1, either full or partial cool season seeding is required immediately following grading, regardless of the season. Overseeding of cool season seeded areas may also be required depending on when the original seeding occurred (see Sec 805.3.1.1 for overseeding requirements).
	Additional mobilization should be provided on projects where construction activities disturb an acre or more over the life of a project (see [[:Category:618 Mobilization\|EPG 618 Mobilization]]).		Additional mobilization should be provided on projects where construction activities disturb an acre or more over the life of a project (see [[:Category:618 Mobilization\|EPG 618 Mobilization]]).

Hoskir: /* 806.1.7.1 Design Considerations */

2022-09-13T14:24:56Z

806.1.7.1 Design Considerations

← Older revision		Revision as of 09:24, 13 September 2022
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	====806.1.7.1 Design Considerations====		====806.1.7.1 Design Considerations====

	Temporary seeding ~~and mulching~~ will be a critical component of temporary stabilization for projects with land disturbance. Temporary seeding shall follow Sec 806.50 and mulching shall be included as a separate bid item in accordance with Sec 802. Temporary ~~seeding quantities for large-scale projects~~ should be ~~set up at 50~~% of ~~final~~ seeding ~~quantities~~, and for ~~small-scale projects~~ temporary ~~seeding quantities~~ should be ~~set up at 100%~~ of ~~final~~ seeding ~~quantities~~. Additional mobilization should be provided on projects where construction activities disturb an acre or more over the life of a project (see [[:Category:618 Mobilization\|EPG 618 Mobilization]]).		Temporary seeding will be a critical component of temporary stabilization for projects with land disturbance. Temporary seeding shall follow Sec 806.50 and mulching shall be included as a separate bid item in accordance with Sec 802. Temporary Seeding should be provided for 100% of areas that will be seeded with Warm Season grasses. This is necessary because, per Sec 805.3.1.2, warm season grass seeding is restricted to the period from Oct. 15 through April 15, and the SWPPP disallows postponement of seed/mulch following grading. If the project includes special provisions that requires any warm-season grass areas to be graded after Oct. 15, but prior to Spring, then those areas can be excluded from Temporary Seeding. Any quantity of Temporary Seeding needed for temporary staged construction should also be provided. A quantity for Mulching should also be provided for all areas of Temporary Seeding. Warm season grass areas that are temporarily seeded and subsequently overseeded after Oct. 15 do not require a second application of mulching.
			Temporary Seeding is not required for areas that are designated to receive Cool Season grass seeding. Per Sec 805.3.1.1, either full or partial cool season seeding is required immediately following grading, regardless of the season. Overseeding of cool season seeded areas may also be required depending on when the original seeding occurred (see Sec 805.3.1.1 for overseeding requirements).
			Additional mobilization should be provided on projects where construction activities disturb an acre or more over the life of a project (see [[:Category:618 Mobilization\|EPG 618 Mobilization]]).

	====806.1.7.2 Construction Considerations====		====806.1.7.2 Construction Considerations====

Smithk: updated link

2022-04-19T18:38:47Z

updated link

← Older revision		Revision as of 13:38, 19 April 2022
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	====806.1.9.1 Design Considerations====		====806.1.9.1 Design Considerations====

	FRM should be considered on projects with steep slopes where history has shown grass growth to be problematic. FRM’s are not an overspray material; they provide superior slope protection that is comparable to erosion control blanket. These products can be applied to any soil type, except sandy material, on any slope and can be used in place of any of the erosion control blankets (ECBs) discussed in [[806.8 Storm Water Pollution Prevention Plan (SWPPP)#806.8.6.3.10 Erosion Control Blankets and Turf Reinforcement Mats\|EPG 806.8.6.3.10 Erosion Control Blankets and Turf Reinforcement Mats]]. These products are not designed to withstand concentrated flows within ditches, drainages or streams. In some instances, especially on longer and/or steeper slopes, it may be necessary to install slope disruptors (wattles/socks/logs/etc.) perpendicular to the sheet flow to decrease runoff velocities down the face of the slope and protect the FRM application from concentrated flows.		FRM should be considered on projects with steep slopes where history has shown grass growth to be problematic. FRM’s are not an overspray material; they provide superior slope protection that is comparable to erosion control blanket. These products can be applied to any soil type, except sandy material, on any slope and can be used in place of any of the erosion control blankets (ECBs) discussed in [[806.8 Storm Water Pollution Prevention Plan (SWPPP)#806.8.6.3.9 Erosion Control Blankets and Turf Reinforcement Mats\|EPG 806.8.6.3.9 Erosion Control Blankets and Turf Reinforcement Mats]]. These products are not designed to withstand concentrated flows within ditches, drainages or streams. In some instances, especially on longer and/or steeper slopes, it may be necessary to install slope disruptors (wattles/socks/logs/etc.) perpendicular to the sheet flow to decrease runoff velocities down the face of the slope and protect the FRM application from concentrated flows.

	====806.1.9.2 Construction Consideration====		====806.1.9.2 Construction Consideration====

Smithk: Per Env'l, guidance for seeding, mulching, and temporary seeding reflects the new standard seed mixes, fertilizer, and lime rates (as shown in the new Standard Plan 805.00 Seeding) will promote a more effective vegetative establishment, allowing for quicker project finalization. MoDOT is obligated to stabilize disturbed areas with permanent building materials or perennial vegetative cover to minimize erosion and sedimentation of disturbed areas.

2022-04-19T18:27:14Z

Per Env'l, guidance for seeding, mulching, and temporary seeding reflects the new standard seed mixes, fertilizer, and lime rates (as shown in the new Standard Plan 805.00 Seeding) will promote a more effective vegetative establishment, allowing for quicker project finalization. MoDOT is obligated to stabilize disturbed areas with permanent building materials or perennial vegetative cover to minimize erosion and sedimentation of disturbed areas.

Show changes

Smithk: Per Bidding, guidance for all jobs that contain the Additional Mobilization for Seeding pay item is now available

2019-10-17T18:14:46Z

Per Bidding, guidance for all jobs that contain the Additional Mobilization for Seeding pay item is now available

← Older revision		Revision as of 13:14, 17 October 2019
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	====806.1.8.1 Design Considerations====		====806.1.8.1 Design Considerations====

	Projects to be constructed in stages where it is known that areas will be shut down for a significant amount of time (generally 14 days or more), designers are to include temporary seeding in the bid documents..		Projects to be constructed in stages where it is known that areas will be shut down for a significant amount of time (generally 14 days or more), designers are to include temporary seeding in the bid documents. Additional mobilization should be provided on projects where construction activities disturb an acre or more over the life of a project (see [[:Category:618 Mobilization\|EPG 618 Mobilization]]).

	====806.1.8.2 Construction Considerations====		====806.1.8.2 Construction Considerations====
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	====806.1.9.1 Design Considerations====		====806.1.9.1 Design Considerations====

	All projects that have land disturbance activities of any amount must include permanent seed and mulch or other permanent BMPs to stabilize those areas without a vegetative root zone. Consideration must be provided for projects with high fill or cut slopes to provide adequate quantities for bidding. Final quantities will be field measured but accuracy in the design phase will reduce costly contact over runs.		All projects that have land disturbance activities of any amount must include permanent seed and mulch or other permanent BMPs to stabilize those areas without a vegetative root zone. Consideration must be provided for projects with high fill or cut slopes to provide adequate quantities for bidding. Final quantities will be field measured but accuracy in the design phase will reduce costly contact over runs. Additional mobilization should be provided on projects where construction activities disturb an acre or more over the life of a project (see [[:Category:618 Mobilization\|EPG 618 Mobilization]]).

	Fertilizer, lime, and seed recommendations shall be requested from the Roadside Section of the Maintenance Division for all projects.		Fertilizer, lime, and seed recommendations shall be requested from the Roadside Section of the Maintenance Division for all projects.

Smithk: /* 806.1.7.2 Construction Considerations */ Per CM and Env'l, simplified guidance by removing guidance that was sufficiently covered in specifications.

2019-07-22T14:47:06Z

806.1.7.2 Construction Considerations: Per CM and Env'l, simplified guidance by removing guidance that was sufficiently covered in specifications.

← Older revision		Revision as of 09:47, 22 July 2019
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	====806.1.7.2 Construction Considerations====		====806.1.7.2 Construction Considerations====

	All temporary pipes shall be installed in the same manner as permanent pipe is installed on the project to assure that the water does not cause erosion around the pipe. Material to backfill the pipe is placed in six-inch lifts and mechanically compacted, although a compaction test is not required. Temporary pipes will be placed to match the existing stream grade ~~to allow~~ aquatic life to pass unimpeded.		Temporary pipes will be placed to match the existing stream grade so aquatic life is allowed to pass unimpeded.

	===806.1.8 Temporary Seeding and Mulching===		===806.1.8 Temporary Seeding and Mulching===

Smithk: /* 806.1.7.2 Construction Considerations */ Per EPS, reverted guidance to previous text. Future update will await support from specs or other standards.

2019-02-25T18:15:05Z

806.1.7.2 Construction Considerations: Per EPS, reverted guidance to previous text. Future update will await support from specs or other standards.

← Older revision		Revision as of 13:15, 25 February 2019
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	====806.1.7.2 Construction Considerations====		====806.1.7.2 Construction Considerations====

	Temporary pipes will be placed to match the existing stream grade so aquatic life ~~is allowed~~ to pass unimpeded.		All temporary pipes shall be installed in the same manner as permanent pipe is installed on the project to assure that the water does not cause erosion around the pipe. Material to backfill the pipe is placed in six-inch lifts and mechanically compacted, although a compaction test is not required. Temporary pipes will be placed to match the existing stream grade to allow aquatic life to pass unimpeded.

	Only graded rock and/or quarry-run rock shall be used for temporary crossing construction. The material must be reasonably well graded, consisting of pieces varying in size from 20 pounds up to and including at least 150-pound pieces. Generally, the maximum weight of any piece should not be more than 500 pounds. Gravel and dirt should not exceed 15% of the total fill volume. The temporary crossing must be constructed to withstand expected high flows.

	===806.1.8 Temporary Seeding and Mulching===		===806.1.8 Temporary Seeding and Mulching===

Smithk: /* 806.1.7 Temporary Pipe and temporary Construction Crossings */ Per Env'l, clarified guidance in a way that will not require any changes from what is currently expected across the districts.

2019-02-22T18:25:26Z

806.1.7 Temporary Pipe and temporary Construction Crossings: Per Env'l, clarified guidance in a way that will not require any changes from what is currently expected across the districts.

← Older revision		Revision as of 13:25, 22 February 2019
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	On large, steep back slopes permanent diversion berms or terraces are used transverse to grade to divert runoff to stabilized slope drains. Such diversions will enable the establishment of permanent vegetative cover on the slopes and will reduce the likelihood of gully formation.		On large, steep back slopes permanent diversion berms or terraces are used transverse to grade to divert runoff to stabilized slope drains. Such diversions will enable the establishment of permanent vegetative cover on the slopes and will reduce the likelihood of gully formation.

	===806.1.7 Temporary Pipe and ~~temporary~~ Construction Crossings===		===806.1.7 Temporary Pipe and Temporary Construction Crossings===

	A temporary pipe is a conduit used temporarily to carry water under a haul road, silt fence, etc. It is used to convey normal and expected high flows at temporary stream crossings, preventing the contractor's equipment from coming in direct contact with the water when crossing active streams or intermittent streams created during heavy rainfalls.		A temporary pipe is a conduit used temporarily to carry water under a haul road, silt fence, etc. It is used to convey normal and expected high flows at temporary stream crossings, preventing the contractor's equipment from coming in direct contact with the water when crossing active streams or intermittent streams created during heavy rainfalls.
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	====806.1.7.1 Design Considerations====		====806.1.7.1 Design Considerations====

	Temporary construction crossings or the use of temporary pipes must be considered in the design phase. MoDOT does not design stream crossings but proper permits such, as a 404 permit, must be obtained before any impacts to regulated jurisdictional streams begin. MoDOT’s Environmental Section should be engaged early to determine any impacts to streams and allow sufficient time to procure all agreements and permits required from the various regulating agencies.		Temporary construction crossings or the use of temporary pipes must be considered in the design phase. MoDOT does not design stream crossings but proper permits, such as a 404 permit, must be obtained before any impacts to regulated jurisdictional streams begin. MoDOT’s Environmental Section should be engaged early to determine any impacts to streams and allow sufficient time to procure all agreements and permits required from the various regulating agencies.

	Temporary stream crossings can be conduits for sediment to find its way into the stream due to gaps in perimeter BMPs along the stream bank. Storm water should be diverted away from locations where stream crossings potentially could be constructed or design erosion sediment control plan to adequately protect these areas.		Temporary stream crossings can be conduits for sediment to find its way into the stream due to gaps in perimeter BMPs along the stream bank. Storm water should be diverted away from locations where stream crossings potentially could be constructed or design erosion sediment control plan to adequately protect these areas.
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	====806.1.7.2 Construction Considerations====		====806.1.7.2 Construction Considerations====

	All temporary pipes shall be installed in the same manner as permanent pipe is installed on the project to assure that the water does not cause erosion around the pipe. Material to backfill the pipe is placed in six-inch lifts and mechanically compacted, although a compaction test is not required. Temporary pipes will be placed to match the existing stream grade ~~to allow~~ aquatic life to pass unimpeded.		Temporary pipes will be placed to match the existing stream grade so aquatic life is allowed to pass unimpeded.

			Only graded rock and/or quarry-run rock shall be used for temporary crossing construction. The material must be reasonably well graded, consisting of pieces varying in size from 20 pounds up to and including at least 150-pound pieces. Generally, the maximum weight of any piece should not be more than 500 pounds. Gravel and dirt should not exceed 15% of the total fill volume. The temporary crossing must be constructed to withstand expected high flows.

	===806.1.8 Temporary Seeding and Mulching===		===806.1.8 Temporary Seeding and Mulching===

Smithk: /* 806.1.5.2 Construction Considerations */

2018-09-28T14:26:13Z

806.1.5.2 Construction Considerations

← Older revision		Revision as of 09:26, 28 September 2018
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	====806.1.5.2 Construction Considerations====		====806.1.5.2 Construction Considerations====

	Interception ditches and letdown structures shall be constructed as shown on the plans or as directed by the engineer. Channel armoring should be installed in accordance with [~~http~~://www.modot.~~mo.gov/business/standards_and_specs~~/~~documents~~/~~60960.pdf~~ Standard Plan 609.60] or in accordance with the manufactures recommendations. Armoring should be installed as soon as possible to reduce the potential erosion of the channel bottom.		Interception ditches and letdown structures shall be constructed as shown on the plans or as directed by the engineer. Channel armoring should be installed in accordance with [https://www.modot.org/media/16883 Standard Plan 609.60] or in accordance with the manufactures recommendations. Armoring should be installed as soon as possible to reduce the potential erosion of the channel bottom.

	===806.1.6 Permanent Diversions===		===806.1.6 Permanent Diversions===

Smithk: /* 806.1.3.2 Construction Considerations */

2018-09-28T14:25:22Z

806.1.3.2 Construction Considerations

← Older revision		Revision as of 09:25, 28 September 2018
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	====806.1.3.2 Construction Considerations====		====806.1.3.2 Construction Considerations====
	Type B Berms are specified when embankment operations are shut down over extended periods of time (i.e., winter), will be constructed to specified dimensions (see [~~http~~://www.modot.~~mo.gov/business/standards_and_specs~~/~~documents~~/~~80610.pdf~~ Standard Plan 806.10]) and will be machine compacted with a minimum of three passes over the entire width of the berm with a dozer tread, grader wheel, etc. Temporary Type B berms must drain to a compacted outlet at a slope drain. The top width of these berms may be wider and the side slopes flatter on transverse berms to allow equipment to pass over these berms with minimal disruption.		Type B Berms are specified when embankment operations are shut down over extended periods of time (i.e., winter), will be constructed to specified dimensions (see [https://www.modot.org/media/16839 Standard Plan 806.10]) and will be machine compacted with a minimum of three passes over the entire width of the berm with a dozer tread, grader wheel, etc. Temporary Type B berms must drain to a compacted outlet at a slope drain. The top width of these berms may be wider and the side slopes flatter on transverse berms to allow equipment to pass over these berms with minimal disruption.

	===806.1.4 Temporary Slope Drains===		===806.1.4 Temporary Slope Drains===