MAINTENANCE DIVISION

Transcription

1 Sheet 1 of 13 VIRGINIA DEPARTMENT OF TRANSPORTATION MAINTENANCE DIVISION INSTRUCTIONAL AND INFORMATIONAL MEMORANDUM GENERAL SUBJECT: ROADSIDE DEVELOPMENT SPECIFIC SUBJECT: ROADSIDE DEVELOPMENT SHEET; COORDINATION; COMPUTING QUANTITIES/SUMMARIZATION NUMBER: IIM-Maint DATE: August 15, 2016 Rev 2: April 1, 2017 SUPERSEDES: APPROVAL: Mohaahi Branco Vlacich, P.E. State Maintenance Administrator April 1, 2017oved April 27, 2009 EFFECTIVE DATE These instructions are effective upon receipt. BACKGROUND This memorandum has been developed to comply with the New Roadside Development Sheet policies and procedures. SPECIALTY SUMMARIES ROADSIDE DEVELOPMENT Quantities relative to Roadside Development and Temporary Erosion and Sediment Control are summarized on the Roadside Development Sheet provided as a CADD file Insertable Sheet. This is a multi-purpose sheet providing types of seed mixtures, rates of application, and quantities. Quantities relative to temporary Erosion and Siltation Control shall be summarized on the Roadside Development Sheet, with the exception of any necessary outfall pipe, which will be summarized in the Drainage Summary.

2 Sheet 2 of 13 The Roadside Development Sheet and the Erosion Control Summary Sheet are to be included in project plan assemblies. The Roadside Development Summary will indicate the Maintenance Division s determination of core seed mixtures, and estimated quantities for Topsoil, Regular (permanent) Seed, Temporary Seed, Overseeding), Legume Seed, Fertilizer and Lime. Seed additives (e.g. Nurse Crops such as foxtail millet) are paid for as Regular Seed except Legumes such as Alfalfa, Dutch White Clover, Crown Vetch, Sericea Lespedeza and Birdsfoot Trefoil, which are paid as Legume Seed. Seed mixture recommendations may at times deviate from the seed mixture guidelines on the Roadside Development Sheet. The District Roadside Manager will provide recommendations for the application of seed mixtures (core mix and additives), fertilizer, lime, etc. SPECIAL INSTRUCTIONS Seeded Area The approximate area to receive Regular Seed and Temporary Seed in acres will be shown under Notes on the Roadside Development Sheet. This area is not to be expanded for estimating purposes. The Designer s responsibilities for providing information to the Roadside Managers are set forth in Chapter 2G of the Road Design Manual, which can accessed at the following web link: Nutrient Management Plan (NMP) The fertilizer quantities for the project will be developed based on the Nutrient Management Plan. The NMP sets the rules for allowable nutrients that can be estimated based on the area to receive topsoil, the area to receive Regular Seed, area to receive Temporary Seed and the area to receive Overseeding. 1. Area to receive Regular Seed The area to receive Regular Seed will be fertilized based on the following rates; a soil sample will not be required: Lime at a rate of 2 tons per acre of agricultural lime. Fertilizer will be specified at a rate of 250 pounds of a (N-P-K ratio) fertilizer per acre for the area that will receive Regular Seed. This equates to the application of 37.5 pounds of N, 75 pounds of P and 37.5 pounds of K per acre.

3 Instructional & Informational Memorandum Sheet 3 of 13 All topsoil that is to be placed on a project will require a soil test. Since the source of the Class B topsoil soil and soil test values of Class A and Class B topsoil are unknown at the time of Roadside Development Sheet calculations, the lime and fertilizer can be estimated based on the following rates: 2. Area to receive Temporary Seed The Temporary Seed area can have the lime and fertilizer quantities estimated based on the following rates; a soil sample will not be required: Lime at a rate of 1 tons per acre of agricultural lime. Fertilizer will be specified at a rate of 125 pounds of a (N-P-K ratio) fertilizer per acre, which equates to the application of pounds of N, 37.5 pounds of P and pounds of K per acre. 3. Area to receive Overseeding The Overseeding area can have the lime and fertilizer quantities estimated based on the following rates; a soil sample will not be required: Lime at a rate of 1 tons per acre of agricultural lime. Fertilizer will be specified at a rate of 65 pounds of a (N-P-K ratio) fertilizer per acre, which equates to the application of 30 pounds of N, 0 pounds of P and 0 pounds of K per acre. MULCH - Hydraulic Erosion Control Product (HECP) HECP will be paid on an acre-applied basis and, therefore, will not be included in the cost of Regular or Temporary Seed. HECP will not be applied with Overseeding. Permanent Stabilization Area: When a project has both mowed and non-mowed areas that will receive Regular Seed two HECP types will normally be specified. One HECP type will be specified for the mowed area, based on the most severe gradient in the area to be mowed. A second HECP type will be specified for the non-mowed area, based on the most severe gradient in the area that will not be mowed. The HECP to be specified on a project will be based on the following: HECP Type 1 will be the specified for slopes with a gradient of 4:1 or flatter. HECP Type 2 will be the specified for slopes with a gradient of 3:1 to 4:1. HECP Type 3 will be the specified for slopes with a gradient of 2:1 to 3:1. HECP Type 4 will be the specified for slopes with a gradient of 1:1 to 2:1.

4 Sheet 4 of 13 A higher HECP Type number may be substituted for a lower HECP Type number if that is cost-effective. For example, HECP Type 2 may be substituted for HECP Type 1; HECP Type 4 may be substituted for any of the lower-numbered HECP Types. Temporary Stabilization Area: HECP Type 3 application will be required on all areas requiring temporary stabilization. The HECP Type 3 applied without seeding acts as an Erosion Control Mulch for up to six months. If the temporary stabilization is desired for longer than six months, then Temporary Seed should be included along with the HECP Type 3 application. If the duration of the temporary stabilization cannot be determined beforehand, proposed stabilization should be estimated as Temporary Stabilization with the application of Temporary Seed and HECP Type 3. LEGUME SEED as part of the Regular Seed Specification The seed mixes available for roadside development, which include Legume seeds such as, Alfalfa, Dutch White Clover, Crown Vetch, Sericea Lespedeza, Birdsfoot Trefoil or other Legume Seed, will be specified as Legume additives on the Roadside Development Sheet. Crown Vetch, Sericea Lespedeza, Birdsfoot Trefoil legume seeds are used only on slopes 3:1 or greater and are not used on shoulders or other locations to be mowed. Legume Seed and Legume Overseeding are to be summarized for separate payment. ESTIMATING SEEDING QUANTITIES The seed mixtures (core mix plus additives) shown on the Roadside Development Sheet are weights per acre for areas to receive Regular Seed, Temporary Seed or Overseeding. Using the example tables below, if the Spring & Fall mix requirements for non-mowed area is 3,B,E, then the 3 represents the core mix, B represents the first additive and E represents the second additive or legume. The core mix and additive(s) recommended may vary for the mowed and non-mowed area, each construction season. The greatest seeding rate, excluding legumes, is assumed to be the normal seeding rate.

5 * ALL RATES TO BE SPECIFIED BY THE DISTRICT ROADSIDE MANAGER + FINE FESCUES INCLUDE CHEWNINGS, CREEPING, RED, HARD, SHEEP Instructional & Informational Memorandum Sheet 5 of 13

6 Sheet 6 of 13 Regular Seed Quantities: 1) Determine the disturbed area (acres) to receiving Regular Seed (total of Mowed and non-mowed acreage). 2) Determine the normal seeding rate by determining the highest Regular Seed quantity specified for any time of year. 3) Determine the normal seeding quantity by multiplying the acres x normal seeding rate. 4) To calculate the Regular Seed quantity the normal seeding quantities can be increased by 25% to account for seeding progression, seeding after sign and guard rail installation, and other minor unplanned disturbances, etc. 5) The total Regular Seed quantity will be equal to the normal seeding quantity plus the 25% incremental seeding quantity. Example: 1) A project with 10 acres to receive Regular Seed 2) The normal seeding rate is core mix 100lbs./ac. + additive 20 lbs./ac. = 120 lbs./ac. 3) The normal seeding quantity: 120 lbs./ac. x 10 ac. = 1200 lbs. 4) Incremental Seeding Adjustment = 1200 lbs. x 25% = 300 lbs. 5) Total Regular Seed Quantity = 1200 lbs lbs. = 1500 lbs. Legume Seed Quantities: 1) Determine the non-mowed portions of the disturbed area (acres) to receive Legume Seed. 2) Determine the normal Legume Seed rate. 3) Determine the normal Legume Seed quantity by multiplying Acres x normal Legume Seed rate. 4) To calculate the Legume Seed quantity the normal seeding quantities can be adjusted by 25% to account for seeding progression, incremental seeding. 5) The total Legume Seed quantity will be equal to the normal seeding quantity plus the incremental seeding quantity. Example: 1) Project with 10 acres to receive Regular Seed, with 5 acres of non-mowed areas to receive Legume Seed. 2) Determine the Legume Seed rate: Legume 20 lbs./ac. 3) Determine the normal seeding quantity: 20 lbs./ac. x 5 acres non-mowed area = 100 lbs. 4) Incremental Seeding Adjustment = 100 lbs. x 25% = 25 lbs. 5) Total Legume Seed Quantity = 100 lbs = 125 lbs.

7 Temporary Seed Quantities: Instructional & Informational Memorandum Sheet 7 of 13 Temporary Seed will be based on the application of 100 pounds per acre of Temporary Seed mix. Example for a Temporary Seed area of 19 acres: The normal Temporary Seed quantity = 100 lbs. / acre 100 lbs. x 19 acres of to be seeded = 1900 lbs. Temporary Seed Quantity No incremental adjustment for Temporary Seed. Overseeding Quantities: For estimating purposes the Overseeding Quantity will be equal to the normal seeding quantity for Regular Seed. For this example the Overseeding quantities for 10 acres would be 1200 lbs. Legume Overseeding Quantities: For estimating purposes the Legume Overseeding quantity will be equal to the normal seeding quantity for Legume Seed Quantity. For this example the Legume Overseeding quantity for 5 acres would be 100 lbs. Total Seeding Quantities: Nutrient Normal Seeding Incremental Adjustment Total Regular Seed Overseeding Temporary Seed Legume Seed Legume Overseeding

8 Sheet 8 of 13 ESTIMATING FERTILIZER QUANTITIES Based on Nutrient Management Plan (NMP) Fertilizer: The quantities for lime, fertilizer, and seeding are based on the actual area to receive Regular Seed, Temporary Seed and Overseeding. Regular Seed: Fertilizer normal quantity will be specified at a rate of 250 pounds of a (N-P- K ratio) fertilizer multiplied by the area that will receive Regular Seed. The normal fertilizer quantity for Regular Seed will be incrementally adjusted by 25%. Fertilizer Example: The normal Regular Seed fertilizer rate is 250 pounds of a (N-P-K ratio) fertilizer, this equates to the application of 37.5 pounds of N, 75 pounds of P and 37.5 pounds of K per acre. N (Nitrogen) N per acre = 15% of 250 lbs. = 37.5 lbs lbs. x 10 acres of area to be seeded = 375 lbs. Regular N Incremental N = 25% of Regular N Quantity (375 lbs. x 25% = lbs.) Total Regular N Quantity = 375 lbs lbs. = lbs. of N P (Phosphorus) P per acre = 30% of 250 lbs. = 75 lbs. 75 lbs. x 10 acres of area to be seeded = 750 lbs. Regular P Incremental P Adjustment = 25% of Regular P Quantity (750 lbs. x 25% = lbs.) Total Regular P Quantity = 750 lbs lbs. = lbs. of P K (Potassium) K per acre = 15% of 250 lbs. = 37.5 lbs lbs. x 10 acres of area to be seeded = 375 lbs. Regular K Incremental K Adjustment = 25% of Regular K Quantity (375 lbs. x 25% = lbs.) Temporary Seed: Total Regular K Quantity = 375 lbs lbs. = lbs. of K Fertilizer quantity for Temporary Seed will be based on the estimated acres to receive Temporary Seed at 125 pounds per acre of N-P-K fertilizer. No incremental adjustment will be made.

9 Fertilizer example: Instructional & Informational Memorandum Sheet 9 of 13 Overseeding: Project has 19 acres to receive Temporary Seed. N (Nitrogen) N per acre = 15 % of 125 lbs. = lbs pounds x 19 acres of to be seeded = lbs. Temporary N No Incremental Adjustment for Temporary Seed P (Phosphorus) P per acre = 30 % of 125 lbs. =37.5 lbs pounds x 19 acres of to be seeded = lbs. Temporary P No Incremental Adjustment for Temporary Seed K (Potassium) N per acre = 15 % of 125 lbs. = lbs pounds x 19 acres of to be seeded = lbs. Temporary K No Incremental Adjustment for Temporary Seed The Overseeding fertilization is specified as 65 lbs./acre of N-P-K fertilizer for an application quantity of lbs./acre of N-P-K. Fertilizer example: N (Nitrogen) N per acre = 46 % of 65 lbs. = 29.9 lbs pounds x 10 acres of to be seeded = 299 lbs. Overseeding N No Incremental Adjustment for Overseeding P (Phosphorus) = 0 Lbs. K (Potassium) = 0 Lbs. Nutrient Regular Seed Temporary Seed Overseeding Total N (Nitrogen) P (Phosphorus) K (Potassium)

10 Sheet 10 of 13 Lime Quantities: Regular Seed: The normal quantity of lime for Regular Seed will be determined based two tons per acre of agricultural lime the normal Quantity for Regular Seed will be calculated by multiplying the acres to receive Regular Seed by two tons per acre, and then the normal quantity will be incrementally adjusted by 25%. Regular Seed Lime example: A project has 10 acres to receive Regular Seed Normal lime = 2 ton x 10 acres = 20 tons Incremental lime Adjustment = 25% of normal Quantity (20 ton x 25% = 5 tons) Total Lime = Normal + Incremental = 20 tons + 5 tons = 25 tons Temporary Seed: Lime quantity for Temporary Seed will be based on the estimated 19 acres to receive Temporary Seed x one (1) ton per acre. No incremental adjustment will be made. Temporary Seed Lime example: A project has 19 acres to receive Temporary Seed The Temporary Seed lime rate = 1 ton per acre. 1 ton x 19 acres of to be seeded = 19 tons Temporary Lime Quantity No Incremental Liming Adjustment for Temporary Lime Quantities Overseeding: Lime quantity for Overseeding will be based on the estimated acres to receive Overseeding x one (1) ton per acre. No incremental adjustment will be made. Overseeding Lime example: A project has 10 acres to receive Overseeding The Overseeding lime rate = 1 ton per acre. 1 ton x 10 acres of to be seeded = 10 tons Overseeding Lime Quantity No Incremental Liming Adjustment for Overseeding Lime Quantitiy Total Lime quantities to be specified for project: Lime for Regular Seed = 25 Tons Lime for Temporary Seed = 19 Tons Lime for Overseeding = 10 Tons Total Lime = 54 Tons

11 Sheet 11 of 13 MULCH - Hydraulic Erosion Control Product (HECP) Regular Seed Example: The Regular Seed area for this project has been estimated to be 10 acres with 5 acres of mow area and 5 acres of non-mow. The gradient for the Mow area is 4:1 and for the nonmow it is 2:1. Regular Seed Mow Area HECP Quantities: Mow Area: 1) Determine the disturbed area (acres) to receiving Regular Seed (total of Mowed area). This will be the normal HECP mow area. 2) Determine the HECP for most severe gradient in the calculated mowed area. 3) To calculate the mow area Regular Seed HECP quantity, the normal seeding quantities can be increased by 25% to account for seeding progression, seeding after sign and guard rail installation, and other unplanned minor disturbances, etc. For example: 1) A project with 5 acres of mow area to receive Regular Seed 2) The gradient for the mow area is 4:1 requires HECP Type 1 3) Incremental seeding adjustment = 5 ac x 25% = 1.25 ac 4) Total Regular Seed Mow Area HECP Quantity = 5 ac ac = 6.25 ac of HECP Type 1 NON-Mow Area: 1) Determine the disturbed area (acres) to receiving Regular Seed (total of non-mowed area). This will be the normal HECP non-mow area. 2) Determine the HECP for most severe gradient in the calculated mowed area. 3) To calculate the Regular Seed mow HECP quantity the normal seeding quantities can be adjusted by 25% to account for seeding progression, incremental seeding and seeding after sign and guard rail installation, etc. For example: 1) A project with 5 acres of non-mow area to receive Regular Seed 2) The gradient for the mow area is 2:1 requires HECP Type 3 3) Incremental seeding adjustment = 5 ac x 25% = 1.25 ac 4) Total Regular Seed non-mow Area HECP Quantity = 5 ac ac = 6.25 ac of HECP Type 3 Temporary Seed Example: The Temporary Seed area for this project has been estimated to be 19 acres and HECP Type 3 is specified for Temporary Seed.

12 Sheet 12 of 13 For example: 1) A project with 19 acres of mow area to receive Temporary Seed 2) Temporary Seed requires HECP Type 3 3) No Incremental seeding adjustment 19 Acres of HECP Type 3 will be required HECP Regular Seed Mow Regular Seed Non-Mow Temporary Seed Overseeding Total Acres TYPE TYPE TYPE TYPE PAY ITEMS PAY ITEM UNIT ITEM CODE Lime TON Fertilizer (N Elemental Nitrogen) LB Fertilizer (P - Phosphoric Acid) LB Fertilizer (K Potash) LB Regular Seed LB Overseeding LB Legume Seed LB Legume Overseeding LB Temporary Seed LB Topsoil Class A AC Topsoil Class B AC HECP Type 1 SY HECP Type 2 SY HECP Type 3 SY HECP Type 4 SY 27113

13 Sheet 13 of 13 REVIEW BY MAINTENANCE DIVISION Anytime the current Insertable Roadside Development Sheet is replaced by a revised Roadside Development Sheet, the District Roadside Manager should be requested to determine the need for any changes in seed mixes, quantities, etc. INSERTABLE SHEETS The Roadside Development Sheet may be accessed from the sheet2000.cel library in MicroStation. - A-4 Roadside Development Sheet (RDSDEV) The Erosion Control Summary Sheet may be accessed from the sheet2000.cel library in MicroStation. - A-5 Erosion Control Summary Sheet (ECSUM)