Technical_Specifications.pdf

TECHNICAL SPECIFICATIONS

For

TRAFFIC SIGNALIZATION TO SERVE THE

INTERSECTION OF PLAZA DRIVE AT COMMERCIAL

DRIVE

BID NO. 2024-22B

TXE-2024-22

APRIL 2024

Item 104

Removing Concrete

1. DESCRIPTION

Break, remove, and salvage or dispose of existing hydraulic cement concrete.

2. CONSTRUCTION

Remove existing hydraulic cement concrete from locations shown on the plans. Avoid damaging concrete that will remain in place. Saw-cut and remove the existing concrete to neat lines. Replace any concrete damaged by the Contractor at no expense to the Department. Accept ownership and properly dispose of broken concrete in accordance with federal, state, and local regulations unless otherwise shown on the plans.

3. MEASUREMENT

Removing concrete pavement, floors, porches, patios, riprap, medians, foundations, sidewalks, driveways, and other appurtenances will be measured by the square yard (regardless of thickness) or by the cubic yard of calculated volume, in its original position.

Removing curb, curb and gutter, and concrete traffic barrier will be measured by the foot in its original position. The removal of monolithic concrete curb or dowelled concrete curb will be included in the concrete pavement measurement.

Removing retaining walls will be measured by the square yard along the front face from the top of the wall to the top of the footing.

This is a plans quantity measurement Item. The quantity to be paid is the quantity shown in the proposal, unless modified by Article 9.2., “Plans Quantity Measurement.” Additional measurements or calculations will be made if adjustments of quantities are required.

4. PAYMENT

The work performed and materials furnished in accordance with this Item and measured as provided under “Measurement” will be paid for at the unit price bid for “Removing Concrete” of the type specified. This price is full compensation for breaking the concrete; loading, hauling, and salvaging or disposing of the material;

and equipment, labor, tools, and incidentals.

Removing retaining wall footings will not be paid for directly but will be considered subsidiary to this Item.

Item 110

Excavation

1. DESCRIPTION

Excavate areas as shown on the plans or as directed. Remove materials encountered to the lines, grades, and typical sections shown on the plans and cross-sections.

2. CONSTRUCTION

Accept ownership of unsuitable or excess material and dispose of material in accordance with local, state, and federal regulations at locations outside the right of way.

Maintain drainage in the excavated area to avoid damage to the roadway section. Correct any damage to the subgrade caused by weather at no additional cost to the Department.

Shape slopes to avoid loosening material below or outside the proposed grades. Remove and dispose of slides as directed.

2.1. Rock Cuts. Excavate to finish subgrade. Manipulate and compact subgrade in accordance with Section 132.3.4., “Compaction Methods,” unless excavation is to clean homogenous rock at finish subgrade elevation. Use approved embankment material compacted in accordance with Section 132.3.4., “Compaction Methods,” to replace undercut material at no additional cost if excavation extends below finish subgrade.

2.2. Earth Cuts. Excavate to finish subgrade. Scarify subgrade to a uniform depth at least 6 in. below finish subgrade elevation in areas where base or pavement structure will be placed on subgrade. Manipulate and compact subgrade in accordance with Section 132.3.4., “Compaction Methods.”

Take corrective measures as directed if unsuitable material is encountered below subgrade elevations.

2.3. Subgrade Tolerances. Excavate to within 1/2 in. in cross-section and 1/2 in. in 16 ft. measured longitudinally for turnkey construction. Excavate to within 0.1 ft. in cross-section and 0.1 ft. in 16 ft. measured longitudinally for staged construction.

3. MEASUREMENT

This Item will be measured by the cubic yard in its original position as computed by the method of average end areas.

This is a plans quantity measurement Item. The quantity to be paid is the quantity shown in the proposal unless modified by Article 9.2., “Plans Quantity Measurement.” Additional measurements or calculations will be made if adjustments of quantities are required.

Limits of measurement for excavation in retaining wall areas will be as shown on the plans.

Shrinkage or swelling factors will not be considered in determining the calculated quantities.

4. PAYMENT

The work performed and materials furnished in accordance with this Item and measured as provided under “Measurement” will be paid for at the unit price bid for “Excavation (Roadway),” “Excavation (Channel),”

“Excavation (Special),” or “Excavation (Roadway and Channel).” This price is full compensation for authorized excavation; drying; undercutting subgrade and reworking or replacing the undercut material in rock cuts; hauling; disposal of material not used elsewhere on the project; scarification and compaction; and equipment, labor, materials, tools, and incidentals.

Drying required deeper than 6 in. below subgrade elevation will be paid for in accordance with Article 9.7., “Payment for Extra Work and Force Account Method.” Excavation and replacement of unsuitable material below subgrade elevations will be performed and paid for in accordance with the applicable bid items.

However, if Item 132, “Embankment,” is not included in the Contract, payment for replacement of unsuitable material will be paid for in accordance with Article 9.7., “Payment for Extra Work and Force Account Method.”

When a slide not due to the Contractor’s negligence or operation occurs, payments for removal and disposal of the slide material will be in accordance with Article 9.7., “Payment for Extra Work and Force Account Method.” Excavation in backfill areas of retaining walls will not be measured or paid for directly but will be subsidiary to pertinent Items.

Item 162

Sodding for Erosion Control

1. DESCRIPTION

Provide and install grass sod as shown on the plans or as directed.

2. MATERIALS

Use live, growing grass sod of the type specified on the plans. Use grass sod with a healthy root system and dense matted roots throughout the soil of the sod for a minimum thickness of 1 in. Do not use sod from areas where the grass is thinned out. Keep sod material moist from the time it is dug until it is planted. Grass sod with dried roots is unacceptable.

2.1. Block Sod. Use block, rolled, or solid sod free from noxious weeds, Johnson grass, other grasses, or any matter deleterious to the growth and subsistence of the sod.

2.2. Mulch Sod. Use mulch sod from an approved source, free from noxious weeds, Johnson grass, other grasses, or any matter deleterious to the growth and subsistence of the sod.

2.3. Fertilizer. Furnish fertilizer in accordance with Article 166.2., “Materials.”

2.4. Water. Furnish water in accordance with Article 168.2., “Materials.”

2.5. Mulch. Use straw mulch consisting of oat, wheat, or rice straw or hay mulch of either Bermudagrass or prairie grasses. Use straw or hay mulch free of Johnson grass and other noxious and foreign materials. Keep the mulch dry and do not use molded or rotted material.

2.6. Tacking Methods. Use a tacking agent applied in accordance with the manufacturer’s recommendations or a crimping method on all straw or hay mulch operations. Use tacking agents as approved or as specified on the plans.

3. CONSTRUCTION

Cultivate the area to a depth of 4 in. before placing the sod. Plant the sod specified and mulch, if required, after the area has been completed to lines and grades as shown on the plans. Apply fertilizer uniformly over the entire area in accordance with Article 166.3., “Construction,” and water in accordance with Article 168.3., “Construction.” Plant between the average date of the last freeze in the Spring and 6 weeks before the average date for the first freeze in the Fall according to the Texas Almanac for the project area.

3.1. Sodding Types.

3.1.1. Spot Sodding. Use only Bermudagrass sod. Create furrows parallel to the roadway, approximately 5 in.

deep and on 18-in. centers. Sod a continuous row not less than 3 in. wide in the 2 furrows adjacent to the roadway. Place 3-in. squares of sod on 15-in. centers in the remaining furrows. Place sod so that the root system will be completely covered by the soil. Firm all sides of the sod with the soil without covering the sod with soil.

3.1.2. Block Sodding. Place sod over the prepared area. Roll or tamp the sodded area to form a thoroughly compacted, solid mat filling all voids in the sodded area with additional sod. Trim and remove all visible netting and backing materials. Keep sod along edges of curbs, driveways, walkways, etc., trimmed until acceptance.

3.1.3. Mulch Sodding. Mow sod source to no shorter than 4 in., rake and remove cuttings. Disk the sod in 2 directions, cutting the sod to a minimum of 4 in. Excavate the sod material to a depth of no more than 6 in.

Keep excavated material moist or it will be rejected. Distribute the mulch sod uniformly over the area to a depth of 6 in. loose, unless otherwise shown on the plans, and roll with a light roller or other suitable equipment.

Add or reshape the mulch sod to meet the requirements of Section 162.3.2., “Finishing.”

3.2. Finishing. Smooth and shape the area after planting to conform to the desired cross-sections. Spread any excess soil uniformly over adjacent areas or dispose of the excess soil as directed.

3.3. Straw or Hay Mulch. Apply straw or hay mulch for “Spot Sodding” and “Mulch Sodding” uniformly over the area as shown on the plans. Apply straw mulch at 2 to 2-1/2 tons per acre. Apply hay mulch at 1-1/2 to 2 tons per acre. Use a tacking method over the mulched area.

4. MEASUREMENT

“Spot Sodding,” “Block Sodding,” and “Straw or Hay Mulch” will be measured by the square yard in its final position. “Mulch Sodding” will be measured by the square yard in its final position or by the cubic yard in vehicles as delivered to the planting site.

5. PAYMENT

The work performed and materials furnished in accordance with this Item and measured as provided under “Measurement” will be paid for at the unit price bid for “Spot Sodding,” “Block Sodding,” “Straw or Hay Mulch,” or “Mulch Sodding.” This price is full compensation for securing a source, excavation, loading, hauling, placing, rolling, finishing, furnishing materials, equipment, labor, tools, supplies, and incidentals.

Fertilizer will not be paid for directly but will be subsidiary to this Item.

Unless otherwise specified on the plans, water, except for that used for maintaining and preparing the sod before planting, will be measured and paid for in accordance with Item 168, “Vegetative Watering.”

Item 164

Seeding for Erosion Control

1. DESCRIPTION

Provide and install temporary or permanent seeding for erosion control as shown on the plans or as directed.

2. MATERIALS

2.1. Seed. Provide seed from the previous season’s crop meeting the requirements of the Texas Seed Law, including the testing and labeling for pure live seed (PLS = Purity × Germination). Furnish seed of the designated species, in labeled unopened bags or containers to the Engineer before planting. Use within 12 mo. from the date of the analysis. When Buffalograss is specified, use seed that is treated with KNO3 (potassium nitrate) to overcome dormancy.

Use Tables 1–4 to determine the appropriate seed mix and rates as specified on the plans. If a plant species is not available by the producers, the other plant species in the recommended seed mixture will be increased proportionally by the PLS/acre of the missing plant species.

Table 1 Permanent Rural Seed Mix

District and Planting Dates Clay Soils Species and Rates (lb. PLS/acre)

Sandy Soils Species and Rates (lb. PLS/acre)

1 (Paris) Feb. 1–May 15

Green Sprangletop Sideoats Grama (Haskell) Bermudagrass Little Bluestem (Native) Illinois Bundleflower

0.3 3.2 1.8 1.7 1.0

Green Sprangletop Bermudagrass Bahiagrass (Pensacola) Sand Lovegrass Weeping Lovegrass (Ermelo) Partridge Pea

0.3 1.5 6.0 0.6 0.8 1.0

2 (Ft. Worth) Feb. 1–May 15

Green Sprangletop (Van Horn) Sideoats Grama (Haskell) Texas Grama (Atascosa) Hairy Grama (Chaparral) Shortspike Windmillgrass (Welder) Little Bluestem (OK Select) Purple Prairie Clover (Cuero) Engelmann Daisy (Eldorado) Illinois Bundleflower Awnless Bushsunflower (Plateau)

1.0 1.0 1.0 0.4 0.2 0.8 0.6 0.75 1.3 0.2

Green Sprangletop (Van Horn) Hooded Windmillgrass (Mariah) Shortspike Windmillgrass (Welder) Hairy Grama (Chaparral) Slender Grama (Dilley) Sand Lovegrass (Mason) Sand Dropseed (Borden County) Partridge Pea (Comanche) Little Bluestem (OK Select) Englemann Daisy (Eldorado) Purple Prairie Clover

1.0 0.2 0.2 0.4 1.0 0.2 0.2 0.6 0.8 0.75 0.3

3 (Wichita Falls) Feb. 1–May 15

Green Sprangletop (Van Horn) Sideoats Grama (Haskell) Texas Grama (Atascosa) Hairy Grama (Chaparral) Shortspike Windmillgrass (Welder) Little Bluestem (OK Select) Blue Grama (Hachita) Western Wheatgrass (Barton) Galleta Grass (Viva) Engelmann Daisy (Eldorado) Awnless Bushsunflower (Plateau)

0.6 1.0 1.0 0.4 0.2 0.8 0.4 1.2 0.6 0.75 0.2

Green Sprangletop (Van Horn) Hooded Windmillgrass (Mariah) Shortspike Windmillgrass (Welder) Hairy Grama (Chaparral) Sand Lovegrass (Mason) Sand Dropseed (Borden County) Partridge Pea (Comanche) Little Bluestem (OK Select) Englemann Daisy (Eldorado) Purple Prairie Clover (Cuero)

1.0 0.2 0.2 0.4 0.2 0.2 0.6 0.8 0.75 0.3

4 (Amarillo) Feb. 15–May 15

Green Sprangletop Sideoats Grama (Haskell) Blue Grama (Hachita) Buffalograss (Texoka) Illinois Bundleflower

0.3 3.6 1.2 1.6 1.0

Green Sprangletop Weeping Lovegrass (Ermelo) Blue Grama (Hachita) Sand Dropseed (Borden Co.)

Sand Bluestem Purple Prairie Clover

0.3 0.8 1.0 0.3 1.8 0.5

District and Planting Dates Clay Soils Species and Rates (lb. PLS/acre)

Sandy Soils Species and Rates (lb. PLS/acre)

5 (Lubbock) Feb. 15–May 15

Green Sprangletop Sideoats Grama (El Reno) Blue Grama (Hachita) Buffalograss (Texoka) Illinois Bundleflower

0.3 3.6 1.2 1.6 1.0

Green Sprangletop Weeping Lovegrass (Ermelo) Blue Grama (Hachita) Sand Dropseed (Borden Co.)

Sand Bluestem Purple Prairie Clover

0.3 0.8 1.0 0.3 1.8 0.5

6 (Odessa) Feb. 1–May 15

Green Sprangletop (Van Horn) Sideoats Grama (South Texas) Blue Grama (Hachita) Galleta Grass (Viva) Shortspike Windmillgrass (Welder) Pink Pappusgrass (Maverick) Alkali Sacaton (Saltalk) Plains Bristlegrass (Catarina Blend) False Rhodes Grass (Kinney) Whiplash Pappusgrass (Webb) Arizona Cottontop (La Salle)

1.0 1.0 0.4 0.6 0.2 0.6 0.2 0.2 0.1 0.6 0.2

Green Sprangletop (Van Horn) Hooded Windmillgrass (Mariah) Blue Grama (Hachita) Hairy Grama (Chaparral) Sand Lovegrass (Mason) Sand Dropseed (Borden County) Indian Ricegrass (Rim Rock) Sand Bluestem (Cottle County) Little Bluestem (Pastura) Purple Prairie Clover (Cuero)

1.0 0.2 0.4 0.4 0.2 0.2 1.6 1.2 0.8 0.3

7 (San Angelo) Feb. 1–May 1

Green Sprangletop (Van Horn) Sideoats Grama (Haskell) Texas Grama (Atascosa) Hairy Grama (Chaparral) Shortspike Windmillgrass (Welder) Little Bluestem (OK Select) Blue Grama (Hachita) Western Wheatgrass (Barton) Galleta Grass (Viva) Engelmann Daisy (Eldorado) Illinois Bundleflower (Sabine)

1.0 1.0 1.0 0.4 0.2 0.4 0.4 1.2 0.6 0.75 1.0

Green Sprangletop (Van Horn) Hooded Windmillgrass (Mariah) Shortspike Windmillgrass (Welder) Hairy Grama (Chaparral) Sand Lovegrass (Mason) Sand Dropseed (Borden County) Sand Bluestem (Cottle County) Partridge Pea (Comanche) Little Bluestem (OK Select) Englemann Daisy (Eldorado) Purple Prairie Clover (Cuero)

1.0 0.2 0.2 0.4 0.2 0.2 1.2 0.6 0.8 0.75 0.3

8 (Abilene) Feb. 1–May 15

Green Sprangletop (Van Horn) Sideoats Grama (Haskell) Texas Grama (Atascosa) Hairy Grama (Chaparral) Shortspike Windmillgrass (Welder) Little Bluestem (OK Select) Blue Grama (Hachita) Western Wheatgrass (Barton) Galleta Grass (Viva) Engelmann Daisy (Eldorado) Illinois Bundleflower (Sabine)

1.0 1.0 1.0 0.4 0.2 0.4 0.4 1.2 0.6 0.75 1.0

Green Sprangletop (Van Horn) Hooded Windmillgrass (Mariah) Shortspike Windmillgrass (Welder) Hairy Grama (Chaparral) Sand Lovegrass (Mason) Sand Dropseed (Borden County) Sand Bluestem (Cottle County) Partridge Pea (Comanche) Little Bluestem (OK Select) Englemann Daisy (Eldorado) Purple Prairie Clover (Cuero)

1.0 0.2 0.2 0.4 0.2 0.2 1.2 0.6 0.8 0.75 0.3

9 (Waco) Feb. 1–May 15

Green Sprangletop (Van Horn) Sideoats Grama (Haskell) Texas Grama (Atascosa) Hairy Grama (Chaparral) Shortspike Windmillgrass (Welder) Little Bluestem (OK Select) Purple Prairie Clover (Cuero) Engelmann Daisy (Eldorado) Illinois Bundleflower Awnless Bushsunflower (Plateau)

1.0 1.0 1.0 0.4 0.2 0.8 0.6 0.75 1.3 0.2

Green Sprangletop (Van Horn) Hooded Windmillgrass (Mariah) Shortspike Windmillgrass (Welder) Hairy Grama (Chaparral) Slender Grama (Dilley) Sand Lovegrass (Mason) Sand Dropseed (Borden County) Partridge Pea (Comanche) Little Bluestem (OK Select) Englemann Daisy (Eldorado) Purple Prairie Clover

1.0 0.2 0.2 0.4 1.0 0.2 0.2 0.6 0.8 0.75 0.3

10 (Tyler) Feb. 1–May 15

Green Sprangletop Bermudagrass Bahiagrass (Pensacola) Sideoats Grama (Haskell) Illinois Bundleflower

0.3 1.8 9.0 2.7 1.0

Green Sprangletop Bermudagrass Bahiagrass (Pensacola) Weeping Lovegrass (Ermelo) Sand Lovegrass Lance-Leaf Coreopsis

0.3 1.8 9.0 0.5 0.5 1.0

11 (Lufkin) Feb. 1–May 15

Green Sprangletop Bermudagrass Bahiagrass (Pensacola) Sideoats Grama (Haskell) Illinois Bundleflower

0.3 1.8 9.0 2.7 1.0

Green Sprangletop Bermudagrass Bahiagrass (Pensacola) Sand Lovegrass Lance-Leaf Coreopsis

0.3 2.1 9.0 0.5 1.0

Table 1 (continued)

Permanent Rural Seed Mix

District and Planting Dates Clay Soils Species and Rates (lb. PLS/acre)

Sandy Soils Species and Rates (lb. PLS/acre)

12 (Houston) Jan. 15–May 15

Green Sprangletop Bermudagrass Sideoats Grama (Haskell) Little Bluestem (Native) Illinois Bundleflower

0.3 2.1 3.2 1.4 1.0

Green Sprangletop Bermudagrass Bahiagrass (Pensacola) Weeping Lovegrass (Ermelo) Lance-Leaf Coreopsis

0.3 2.4 10.5 1.0 1.0

13 (Yoakum) Jan. 15–May 15

Green Sprangletop (Van Horn) Sideoats Grama (South Texas) Texas Grama (Atascosa) Slender Grama (Dilley) Shortspike Windmillgrass (Welder) Halls Panicum (Oso) Plains Bristlegrass (Catarina Blend) Canada Wildrye (Lavaca) Illinois Bundleflower (Sabine) Purple Prairie Clover (Cuero)

1.0 1.0 1.5 1.0 0.3 0.2 0.2 2.0 1.3 0.6

Green Sprangletop (Van Horn) Hooded Windmillgrass (Mariah) Slender Grama (Dilley) Hairy Grama (Chaparral) Shortspike Windmillgrass (Welder) Purple Prairie Clover (Cuero) Partridge Pea (Comanche) Englemann Daisy (Eldorado)

1.0 0.4 1.0 0.8 0.2 0.6 0.6 1.0

14 (Austin) Feb. 1–May 15

Green Sprangletop (Van Horn) Sideoats Grama (South Texas) Texas Grama (Atascosa) Hairy Grama (Chaparral) Shortspike Windmillgrass (Welder) Little Bluestem (OK Select) Purple Prairie Clover (Cuero) Engelmann Daisy (Eldorado) Illinois Bundleflower (Sabine) Awnless Bushsunflower (Plateau)

1.0 1.0 1.0 0.4 0.2 0.8 0.6 0.75 1.3 0.2

Green Sprangletop (Van Horn) Hooded Windmillgrass (Mariah) Shortspike Windmillgrass (Welder) Hairy Grama (Chaparral) Slender Grama (Dilley) Sand Lovegrass (Mason) Sand Dropseed (Borden County) Partridge Pea (Comanche) Little Bluestem (OK Select) Englemann Daisy (Eldorado) Purple Prairie Clover

1.0 0.2 0.2 0.4 1.0 0.2 0.2 0.6 0.8 0.75 0.3

15 (San Antonio) Feb. 1–May 1

Green Sprangletop (Van Horn) Sideoats Grama (South Texas) Texas Grama (Atascosa) Slender Grama (Dilley) Shortspike Windmillgrass (Welder) Pink Pappusgrass (Maverick) Halls Panicum (Oso) Plains Bristlegrass (Catarina Blend) False Rhodes Grass (Kinney) Hooded Windmillgrass (Mariah) Arizona Cottontop (La Salle)

1.0 1.0 1.0 1.0 0.2 0.6 0.2 0.2 0.1 0.2 0.2

Green Sprangletop (Van Horn) Slender Grama (Dilley) Hairy Grama (Chaparral) Shortspike Windmillgrass (Welder) Pink Pappusgrass (Maverick) Plains Bristlegrass (Catarina Blend) Hooded Windmillgrass (Mariah) Multi-flowered False Rhoades Grass (Hidalgo) Arizona Cottontop (La Salle)

1.0 2.0 0.6 0.4 0.6 0.2 0.3 0.1 0.2

16 (Corpus Christi) Jan. 1–May 1

Green Sprangletop (Van Horn) Sideoats Grama (South Texas) Texas Grama (Atascosa) Slender Grama (Dilley) Shortspike Windmillgrass (Welder) Pink Pappusgrass (Maverick) Halls Panicum (Oso) Plains Bristlegrass (Catarina Blend) False Rhodes Grass (Kinney) Hooded Windmillgrass (Mariah) Arizona Cottontop (La Salle)

1.0 1.0 1.0 1.0 0.2 0.6 0.2 0.2 0.1 0.2 0.2

Green Sprangletop (Van Horn) Slender Grama (Dilley) Hairy Grama (Chaparral) Shortspike Windmillgrass (Welder) Pink Pappusgrass (Maverick) Plains Bristlegrass (Catarina Blend) Hooded Windmillgrass (Mariah) Multi-flowered False Rhodes Grass (Hidalgo) Arizona Cottontop (La Salle)

1.0 2.0 0.6 0.4 0.6 0.2 0.3 0.1 0.2

17 (Bryan) Feb. 1–May 15

Green Sprangletop Bermudagrass Sideoats Grama (Haskell) Little Bluestem (Native) Illinois Bundleflower

0.3 1.5 3.6 1.7 1.0

Green Sprangletop Bermudagrass Bahiagrass (Pensacola) Weeping Lovegrass (Ermelo) Sand Lovegrass Lance-Leaf Coreopsis

0.3 1.5 7.5 0.6 0.6 1.0

District and Planting Dates Clay Soils Species and Rates (lb. PLS/acre)

Sandy Soils Species and Rates (lb. PLS/acre)

18 (Dallas) Feb. 1–May 15

Green Sprangletop (Van Horn) Sideoats Grama (Haskell) Texas Grama (Atascosa) Hairy Grama (Chaparral) Shortspike Windmillgrass (Welder) Little Bluestem (OK Select) Purple Prairie Clover (Cuero) Engelmann Daisy (Eldorado) Illinois Bundleflower Awnless Bushsunflower (Plateau)

1.0 1.0 1.0 0.4 0.2 0.8 0.6 0.75 1.3 0.2

Green Sprangletop (Van Horn) Hooded Windmillgrass (Mariah) Shortspike Windmillgrass (Welder) Hairy Grama (Chaparral) Slender Grama (Dilley) Sand Lovegrass (Mason) Sand Dropseed (Borden County) Partridge Pea (Comanche) Little Bluestem (OK Select) Englemann Daisy (Eldorado) Purple Prairie Clover

1.0 0.2 0.2 0.4 1.0 0.2 0.2 0.6 0.8 0.75 0.3

19 (Atlanta) Feb. 1–May 15

Green Sprangletop Bermudagrass Sideoats Grama (Haskell) Illinois Bundleflower

0.3 2.4 4.5 1.0

Green Sprangletop Bermudagrass Bahiagrass (Pensacola) Sand Lovegrass Lance-Leaf Coreopsis

0.3 2.1 7.5 0.6 1.0

20 (Beaumont) Jan. 15–May 15

Green Sprangletop Bermudagrass Sideoats Grama (Haskell) Illinois Bundleflower

0.3 2.7 4.1 1.0

Green Sprangletop Bermudagrass Bahiagrass (Pensacola) Sand Lovegrass Lance-Leaf Coreopsis

0.3 2.1 7.5 0.6 1.0

21 (Pharr) Jan. 15–May 15

Green Sprangletop (Van Horn) Sideoats Grama (South Texas) Texas Grama (Atascosa) Slender Grama (Dilley) Shortspike Windmillgrass (Welder) Pink Pappusgrass (Maverick) Halls Panicum (Oso) Plains Bristlegrass (Catarina Blend) False Rhodes Grass (Kinney) Hooded Windmillgrass (Mariah) Arizona Cottontop (La Salle)

1.0 1.0 1.0 1.0 0.2 0.6 0.2 0.2 0.1 0.2 0.2

Green Sprangletop (Van Horn) Slender Grama (Dilley) Hairy Grama (Chaparral) Shortspike Windmillgrass (Welder) Pink Pappusgrass (Maverick) Plains Bristlegrass (Catarina Blend) Hooded Windmillgrass (Mariah) Multi-flowered False Rhoades Grass

0.6 0.4 0.6 0.2 0.3 0.1 0.2

22 (Laredo) Jan. 15–May 1

Green Sprangletop (Van Horn) Sideoats Grama (South Texas) Texas Grama (Atascosa) Slender Grama (Dilley) Shortspike Windmillgrass (Welder) Pink Pappusgrass (Maverick) Halls Panicum (Oso) Plains Bristlegrass (Catarina Blend) False Rhodes Grass (Kinney) Hooded Windmillgrass (Mariah) Arizona Cottontop (La Salle)

1.0 1.0 1.0 1.0 0.2 0.6 0.2 0.2 0.1 0.2 0.2

Green Sprangletop (Van Horn) Slender Grama (Dilley) Hairy Grama (Chaparral) Shortspike Windmillgrass (Welder) Pink Pappusgrass (Maverick) Plains Bristlegrass (Catarina Blend) Hooded Windmillgrass (Mariah) Multi-flowered False Rhoades Grass

0.6 0.4 0.6 0.2 0.3 0.1 0.2

23 (Brownwood) Feb. 1–May 15

Green Sprangletop (Van Horn) Sideoats Grama (Haskell) Texas Grama (Atascosa) Hairy Grama (Chaparral) Shortspike Windmillgrass (Welder) Little Bluestem (OK Select) Blue Grama (Hachita) Western Wheatgrass (Barton) Galleta Grass (Viva) Engelmann Daisy (Eldorado) Awnless Bushsunflower (Plateau)

0.6 1.0 1.0 0.4 0.2 0.8 0.4 1.2 0.6 0.75 0.2

Green Sprangletop (Van Horn) Hooded Windmillgrass (Mariah) Shortspike Windmillgrass (Welder) Hairy Grama (Chaparral) Sand Lovegrass (Mason) Sand Dropseed (Borden County) Partridge Pea (Comanche) Little Bluestem (OK Select) Englemann Daisy (Eldorado) Purple Prairie Clover (Cuero)

1.0 0.2 0.2 0.4 0.2 0.2 0.6 0.8 0.75 0.3

District and Planting Dates Clay Soils Species and Rates (lb. PLS/acre)

Sandy Soils Species and Rates (lb. PLS/acre)

24 (El Paso) Feb. 1–May 15

Green Sprangletop (Van Horn) Sideoats Grama (South Texas) Blue Grama (Hachita) Galleta Grass (Viva) Shortspike Windmillgrass (Welder) Pink Pappusgrass (Maverick) Alkali Sacaton (Saltalk) Plains Bristlegrass (Catarina Blend) False Rhodes Grass (Kinney) Whiplash Pappusgrass (Webb) Arizona Cottontop (La Salle)

1.0 1.0 0.4 0.6 0.2 0.6 0.2 0.2 0.1 0.6 0.2

Green Sprangletop (Van Horn) Hooded Windmillgrass (Mariah) Blue Grama (Hachita) Hairy Grama (Chaparral) Sand Lovegrass (Mason) Sand Dropseed (Borden County) Indian Ricegrass (Rim Rock) Sand Bluestem (Cottle County) Little Bluestem (Pastura) Purple Prairie Clover (Cuero)

1.0 0.2 0.4 0.4 0.2 0.2 1.6 1.2 0.8 0.3

25 (Childress) Feb. 1–May 15

Green Sprangletop Sideoats Grama (El Reno) Blue Grama (Hachita) Western Wheatgrass Galleta Illinois Bundleflower

0.3 2.7 0.9 2.1 1.6 1.0

Green Sprangletop Weeping Lovegrass (Ermelo) Sand Dropseed (Borden Co.)

Sand Lovegrass Purple Prairie Clover

0.3 1.2 0.5 0.8 0.5

Table 2

Permanent Urban Seed Mix

District and Planting Dates Clay Soils Species and Rates (lb. PLS/acre)

Sandy Soils Species and Rates (lb. PLS/acre)

1 (Paris) Feb. 1–May 15

Green Sprangletop Bermudagrass Sideoats Grama (Haskell)

0.3 2.4 4.5

Green Sprangletop Bermudagrass

0.3 5.4

2 (Ft. Worth) Feb. 1–May 15

Green Sprangletop Sideoats Grama (El Reno) Bermudagrass Buffalograss (Texoka)

0.3 3.6 2.4 1.6

Green Sprangletop Sideoats Grama (El Reno) Bermudagrass Sand Dropseed (Borden Co.)

0.3 3.6 2.1 0.3

3 (Wichita Falls) Feb. 1–May 15

Green Sprangletop Sideoats Grama (El Reno) Bermudagrass Buffalograss (Texoka)

0.3 4.5 1.8 1.6

Green Sprangletop Sideoats Grama (El Reno) Bermudagrass Sand Dropseed (Borden Co.)

0.3 3.6 1.8 0.4

4 (Amarillo) Feb. 15–May 15

Green Sprangletop Sideoats Grama (El Reno) Blue Grama (Hachita) Buffalograss (Texoka)

0.3 3.6 1.2 1.6

Green Sprangletop Sideoats Grama (El Reno) Blue Grama (Hachita) Sand Dropseed (Borden Co.)

Buffalograss (Texoka)

0.3 2.7 0.9 0.4 1.6

5 (Lubbock) Feb. 15–May 15

Green Sprangletop Sideoats Grama (El Reno) Blue Grama (Hachita) Buffalograss (Texoka)

0.3 3.6

Sideoats Grama (El Reno) Blue Grama (Hachita) Sand Dropseed (Borden Co.)

Buffalograss (Texoka)

0.3 2.7 0.9 0.4 1.6

6 (Odessa) Feb. 1–May 15

Green Sprangletop Sideoats Grama (Haskell) Blue Grama (Hachita) Buffalograss (Texoka)

0.3 3.6

Sideoats Grama (Haskell) Sand Dropseed (Borden Co.)

Blue Grama (Hachita) Buffalograss (Texoka)

0.3 2.7 0.4 0.9 1.6

7 (San Angelo) Feb. 1–May 1

Green Sprangletop Sideoats Grama (Haskell) Buffalograss (Texoka)

0.3 7.2

Sideoats Grama (Haskell) Sand Dropseed (Borden Co.)

Blue Grama (Hachita) Buffalograss (Texoka)

0.3 3.2 0.3 0.9 1.6

8 (Abilene) Feb. 1–May 15

Green Sprangletop Sideoats Grama (Haskell) Blue Grama (Hachita) Buffalograss (Texoka)

0.3 3.6 1.2 1.6

Green Sprangletop Sand Dropseed (Borden Co.)

Sideoats Grama (Haskell) Blue Grama (Hachita) Buffalograss (Texoka)

0.3 0.3 3.6 0.8 1.6

District and Planting Dates Clay Soils Species and Rates (lb. PLS/acre)

Sandy Soils Species and Rates (lb. PLS/acre)

9 (Waco) Feb. 1–May 15

Green Sprangletop Bermudagrass Buffalograss (Texoka) Sideoats Grama (Haskell)

0.3 1.8 1.6 4.5

Green Sprangletop Buffalograss (Texoka) Bermudagrass Sand Dropseed (Borden Co.)

0.3 1.6 3.6 0.4

10 (Tyler) Feb. 1–May 15

Green Sprangletop Bermudagrass Sideoats Grama (Haskell)

0.3 2.4 4.5

Green Sprangletop Bermudagrass

0.3 5.4

11 (Lufkin) Feb. 1–May 15

Green Sprangletop Bermudagrass Sideoats Grama (Haskell)

0.3 2.4 4.5

Green Sprangletop Bermudagrass

0.3 5.4

12 (Houston) Jan. 15–May 15

Green Sprangletop Sideoats Grama (Haskell) Bermudagrass

0.3 4.5 2.4

Green Sprangletop Bermudagrass

0.3 5.4

13 (Yoakum) Jan. 15–May 15

Green Sprangletop Sideoats Grama (South Texas) Bermudagrass

0.3 4.5 2.4

Green Sprangletop Bermudagrass

0.3 5.4

14 (Austin) Feb. 1–May 15

Green Sprangletop Bermudagrass Sideoats Grama (South Texas) Buffalograss (Texoka)

0.3 2.4 3.6 1.6

Green Sprangletop Bermudagrass Buffalograss (Texoka)

0.3 4.8 1.6

15 (San Antonio) Feb. 1–May 1

Green Sprangletop Sideoats Grama (South Texas) Bermudagrass Buffalograss (Texoka)

0.3 3.6 2.4 1.6

Green Sprangletop Bermudagrass Buffalograss (Texoka)

0.3 4.8 1.6

16 (Corpus Christi) Jan. 1–May 1

Green Sprangletop Sideoats Grama (South Texas) Bermudagrass Buffalograss (Texoka)

0.3 3.6 2.4 1.6

Green Sprangletop Bermudagrass Buffalograss (Texoka)

0.3 4.8 1.6

17 (Bryan) Feb. 1–May 15

Green Sprangletop Bermudagrass Sideoats Grama (Haskell)

0.3 2.4 4.5

Green Sprangletop Bermudagrass

0.3 5.4

18 (Dallas) Feb. 1–May 15

Green Sprangletop Sideoats Grama (El Reno) Buffalograss (Texoka) Bermudagrass

0.3 3.6 1.6 2.4

Green Sprangletop Buffalograss (Texoka) Bermudagrass Sand Dropseed (Borden Co.)

0.3 1.6 3.6 0.4

19 (Atlanta) Feb. 1–May 15

Green Sprangletop Bermudagrass Sideoats Grama (Haskell)

0.3 2.4 4.5

Green Sprangletop Bermudagrass

0.3 5.4

20 (Beaumont) Jan. 15–May 15

Green Sprangletop Bermudagrass Sideoats Grama (Haskell)

0.3 2.4 4.5

Green Sprangletop Bermudagrass

0.3 5.4

21 (Pharr) Jan. 15–May 15

Green Sprangletop Sideoats Grama (South Texas) Buffalograss (Texoka) Bermudagrass

0.3 3.6 1.6 2.4

Green Sprangletop Buffalograss (Texoka) Bermudagrass Sand Dropseed (Borden Co.)

0.3 1.6 3.6 0.4

22 (Laredo) Jan. 15–May 1

Green Sprangletop Sideoats Grama (South Texas) Buffalograss (Texoka) Bermudagrass

0.3 4.5 1.6 1.8

Green Sprangletop Buffalograss (Texoka) Bermudagrass Sand Dropseed

0.3 1.6 3.6 0.4

23 (Brownwood) Feb. 1–May 15

Green Sprangletop Sideoats Grama (Haskell) Bermudagrass Blue Grama (Hachita)

0.3 3.6 1.2 0.9

Green Sprangletop Buffalograss (Texoka) Bermudagrass Sand Dropseed (Borden Co.)

0.3 1.6 3.6 0.4

24 (El Paso) Feb. 1–May 15

Green Sprangletop Sideoats Grama (South Texas) Blue Grama (Hachita) Buffalograss (Texoka)

0.3 3.6 1.2 1.6

Green Sprangletop Buffalograss (Texoka) Sand Dropseed (Borden Co.)

Blue Grama (Hachita)

0.3 1.6 0.4 1.8

25 (Childress) Feb. 1–May 15

Green Sprangletop Sideoats Grama (El Reno) Blue Grama (Hachita) Buffalograss (Texoka)

0.3 3.6 1.2 1.6

Green Sprangletop Sand Dropseed (Borden Co.)

Buffalograss (Texoka) Bermudagrass

0.3 0.4 1.6 1.8

Table 2 (continued)

Permanent Urban Seed Mix

Table 3 Temporary Cool Season Seeding

Districts Dates Seed Mix and Rates

(lb. PLS/acre)

Paris (1), Amarillo (4), Lubbock (5), Dallas (18) September 1–November 30 Tall Fescue Western Wheatgrass Wheat (Red, Winter)

4.5 5.6

Odessa (6), San Angelo (7), El Paso (24) September 1–November 30 Western Wheatgrass Wheat (Red, Winter)

8.4

Waco (9), Tyler (10), Lufkin (11), Austin (14), San Antonio (15), Bryan (17), Atlanta (19)

September 1–November 30 Tall Fescue Oats Wheat

4.5

Houston (12), Yoakum (13), Corpus Christi (16), Beaumont (20), Pharr (21), Laredo (22)

September 1–November 30 Oats 72

Ft. Worth (2), Wichita Falls (3), Abilene (8), Brownwood (23), Childress (25)

September 1–November 30 Tall Fescue Western Wheatgrass Cereal Rye

4.5 5.6

Table 4

Temporary Warm Season Seeding

Districts Dates Seed Mix and Rates

(lb. PLS/acre)

All May 1–August 31 Foxtail Millet 34

2.2. Fertilizer. Use fertilizer in conformance with Article 166.2., “Materials.”

2.3. Vegetative Watering. Use water that is clean and free of industrial wastes and other substances harmful to the growth of vegetation.

2.4. Mulch.

2.4.1. Straw or Hay Mulch. Use straw or hay mulch in conformance with Section 162.2.5., “Mulch.”

2.4.2. Cellulose Fiber Mulch. Use only cellulose fiber mulches that are on the Approved Products List, Erosion Control Approved Products. (http://www.txdot.gov/business/resources/erosion-control.html) Submit one full set of manufacturer’s literature for the selected material. Keep mulch dry until applied. Do not use molded or rotted material.

2.5. Tacking Methods. Use a tacking agent applied in accordance with the manufacturer’s recommendations or a crimping method on all straw or hay mulch operations. Use tacking agents as approved or as specified on the plans.

3. CONSTRUCTION

Cultivate the area to a depth of 4 in. before placing the seed unless otherwise directed. Use approved equipment to vertically track the seedbed as shown on the plans or as directed. Cultivate the seedbed to a depth of 4 in. or mow the area before placement of the permanent seed when performing permanent seeding after an established temporary seeding. Plant the seed specified and mulch, if required, after the area has been completed to lines and grades as shown on the plans.

3.1. Broadcast Seeding. Distribute the seed or seed mixture uniformly over the areas shown on the plans using hand or mechanical distribution or hydro-seeding on top of the soil unless otherwise directed. Apply the mixture to the area to be seeded within 30 min. of placement of components in the equipment when seed and water are to be distributed as a slurry during hydro-seeding. Roll the planted area with a light roller or other suitable equipment. Roll sloped areas along the contour of the slopes.

http://www.txdot.gov/business/resources/erosion-control.html

3.2. Straw or Hay Mulch Seeding. Plant seed according to Section 164.3.1., “Broadcast Seeding.” Apply straw or hay mulch uniformly over the seeded area immediately after planting the seed or seed mixture. Apply straw mulch at 2 to 2.5 tons per acre. Apply hay mulch at 1.5 to 2 tons per acre. Use a tacking method over the mulched area.

3.3. Cellulose Fiber Mulch Seeding. Plant seed in accordance with Section 164.3.1., “Broadcast Seeding.”

Apply cellulose fiber mulch uniformly over the seeded area immediately after planting the seed or seed mixture at the following rates.

Sandy soils with slopes of 3:1 or less—2,500 lb. per acre.

Sandy soils with slopes greater than 3:1—3,000 lb. per acre.

Clay soils with slopes of 3:1 or less—2,000 lb. per acre.

Clay soils with slopes greater than 3:1—2,300 lb. per acre.

Cellulose fiber mulch rates are based on dry weight of mulch per acre. Mix cellulose fiber mulch and water to make a slurry and apply uniformly over the seeded area using suitable equipment.

3.4. Drill Seeding. Plant seed or seed mixture uniformly over the area shown on the plans at a depth of 1/4 to 1/3 in. using a pasture or rangeland type drill unless otherwise directed. Plant seed along the contour of the slopes.

3.5. Straw or Hay Mulching. Apply straw or hay mulch uniformly over the area as shown on the plans. Apply straw mulch at 2 to 2.5 tons per acre. Apply hay mulch at 1.5 to 2 tons per acre. Use a tacking method over the mulched area.

Apply fertilizer in conformance with Article 166.3., “Construction.” Seed and fertilizer may be distributed simultaneously during “Broadcast Seeding” operations, provided each component is applied at the specified rate. Apply half of the required fertilizer during the temporary seeding operation and the other half during the permanent seeding operation when temporary and permanent seeding are both specified for the same area.

Water the seeded areas at the rates and frequencies as shown on the plans or as directed.

4. MEASUREMENT

This Item will be measured by the square yard or by the acre.

5. PAYMENT

The work performed and the materials furnished in accordance with this Item and measured as provided under “Measurement” will be paid for at the unit price bid for “Broadcast Seeding (Perm)” of the rural or urban seed mixture and sandy or clay soil specified, “Broadcast Seeding (Temp)” of warm or cool season specified, “Straw or Hay Mulch Seeding (Perm)” of the rural or urban seed mixture and sandy or clay soil specified, “Straw or Hay Mulch Seeding (Temp)” of warm or cool season specified, “Cellulose Fiber Mulch Seeding (Perm)” of the rural or urban seed mixture and sandy or clay soil specified, “Cellulose Fiber Mulch Seeding (Temp)” of warm or cool season specified, “Drill Seeding (Perm)” of the rural or urban seed mixture and sandy or clay soil specified, “Drill Seeding (Temp)” of warm or cool season specified, and “Straw or Hay Mulching.” This price is full compensation for furnishing materials, including water for hydro-seeding and hydro-mulching operations, mowing, labor, equipment, tools, supplies, and incidentals. Fertilizer will not be paid for directly but will be subsidiary to this Item. Water for irrigating the seeded area, when specified, will be paid for under Item 168, “Vegetative Watering.”

Item 260

Lime Treatment (Road-Mixed)

1. DESCRIPTION

Mix and compact lime, water, and subgrade or base (with or without asphaltic concrete pavement) in the roadway.

2. MATERIALS

Furnish uncontaminated materials of uniform quality that meet the requirements of the plans and specifications. Notify the Engineer of the proposed material sources and of changes to material sources.

Obtain verification from the Engineer that the specification requirements are met before using the sources.

The Engineer may sample and test project materials at any time before compaction. Use Tex-100-E for material definitions.

2.1. Lime. Furnish lime that meets the requirements of DMS-6350, “Lime and Lime Slurry,” and DMS-6330, “Pre- Qualification of Lime Sources.” Use hydrated lime, commercial lime slurry, quicklime, or carbide lime slurry as shown on the plans. Do not use quicklime when sulfates are present in quantities greater than 3,000 ppm.

When furnishing quicklime, provide it in bulk.

2.2. Subgrade. The Engineer will determine the sulfate content of the existing subgrade in accordance with Tex-145-E and organic content in accordance with Tex-148-E before lime treatment begins. Suspend operations when material to be treated has a sulfate content greater than 7,000 ppm or an organic content greater than 1.0% and proceed as directed.

2.3. Flexible Base. Unless otherwise shown on the plans, furnish base material that meets the requirements of Item 247, “Flexible Base,” for the type and grade shown on the plans, before the addition of lime.

2.4. Water. Furnish water free of industrial wastes and other objectionable material.

2.5. Asphalt. When asphalt or emulsion is permitted for curing purposes, furnish materials that meet the requirements of Item 300, “Asphalts, Oils, and Emulsions,” as shown on the plans or as directed.

2.6. Mix Design. The Engineer will determine the target lime content and optimum moisture content in accordance with Tex-121-E or prior experience with the project materials. The Contractor may propose a mix design developed in accordance with Tex-121-E. The Engineer will use Tex-121-E to verify the Contractor’s proposed mix design before acceptance. Reimburse the Department for subsequent mix designs or partial designs necessitated by changes in the material or requests by the Contractor. Limit the amount of recycled asphalt pavement to no more than 50% of the mix unless otherwise shown on the plans or directed.

3. EQUIPMENT

Provide machinery, tools, and equipment necessary for proper execution of the work. Provide rollers in accordance with Item 210, “Rolling.” Provide proof rollers in accordance with Item 216, “Proof Rolling,” when required.

3.1. Storage Facility. Store quicklime and dry hydrated lime in closed, weatherproof containers.

3.2. Slurry Equipment. Use slurry tanks equipped with agitation devices to slurry hydrated lime or quicklime on the project or other approved location. The Engineer may approve other slurrying methods.

http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi100.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/DMS/6000_series/pdfs/6350.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/DMS/6000_series/pdfs/6330.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi145.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi148.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi121.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi121.pdf

3.3. Provide a pump for agitating the slurry when the distributor truck is not equipped with an agitator. Equip the distributor truck with a sampling device in accordance with Tex-600-J, Part I, when using commercial lime slurry or carbide lime slurry.

3.4. Hydrated Lime Distribution Equipment. Provide equipment to spread lime evenly across the area to be treated. Provide equipment with a rotary vane feeder to spread lime, when shown on the plans.

3.5. Pulverization Equipment. Provide pulverization equipment that:

cuts and pulverizes material uniformly to the proper depth with cutters that plane to a uniform surface over the entire width of the cut, provides a visible indication of the depth of cut at all times, and uniformly mixes the materials.

4. CONSTRUCTION

Construct each layer uniformly, free of loose or segregated areas, and with the required density and moisture content. Provide a smooth surface that conforms to the typical sections, lines, and grades shown on the plans or as directed.

4.1. Preparation of Subgrade or Existing Base for Treatment. Before treating, remove existing asphalt pavement in accordance with Item 105, “Removing Treated and Untreated Base and Asphalt Pavement,” when shown on the plans or as directed. Shape existing material in accordance with applicable bid items to conform to typical sections shown on the plans and as directed.

Unless otherwise approved, proof roll the roadbed in accordance with Item 216, “Proof Rolling,” before pulverizing or scarifying existing material. Correct soft spots as directed.

When material is imported from a borrow source, notify the Engineer of the location of the borrow source well in advance to allow time for testing and approval to avoid delay to the project. Stockpile as directed. The Engineer will test the borrow source and determine the sulfate and organic contents. When the borrow source has a sulfate content greater than 3,000 ppm or an organic content greater than 1.0%, proceed as directed.

When new base material is required to be mixed with existing base, deliver, place, and spread the new material in the required amount per station. Manipulate and thoroughly mix new base with existing material to provide a uniform mixture to the specified depth before shaping.

4.2. Pulverization. Pulverize or scarify existing material after shaping so that 100% passes a 2-1/2 in. sieve. If the material cannot be uniformly processed to the required depth in a single pass, excavate and windrow the material to expose a secondary grade to achieve processing to plan depth.

4.3. Application of Lime. Uniformly apply lime using dry or slurry placement as shown on the plans or as directed. Add lime at the percentage determined in Section 260.2.6., “Mix Design.” Apply lime only on an area where mixing can be completed during the same working day.

Start lime application only when the air temperature is at least 35°F and rising or is at least 40°F. The temperature will be taken in the shade and away from artificial heat. Suspend application when the Engineer determines that weather conditions are unsuitable.

Minimize dust and scattering of lime by wind. Do not apply lime when wind conditions, in the opinion of the Engineer, cause blowing lime to become dangerous to traffic or objectionable to adjacent property owners.

When pebble grade quicklime is placed dry, mix the material and lime thoroughly at the time of lime application. Use of quicklime can be dangerous. Inform users of the recommended precautions for handling and storage.

http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/600-J_series/pdfs/chm600.pdf

4.3.1. Dry Placement. Before applying lime, bring the prepared roadway to approximately 2 percentage points above optimum moisture content. When necessary, sprinkle in accordance with Item 204, “Sprinkling.”

Distribute the required quantity of hydrated lime or pebble grade quicklime with approved equipment. Only hydrated lime may be distributed by bag. Do not use a motor grader to spread hydrated lime.

4.3.2. Slurry Placement. Provide slurry free of objectionable materials, at or above the minimum dry solids content, and with a uniform consistency that will allow ease of handling and uniform application. Deliver commercial lime slurry or carbide lime slurry to the jobsite, or use hydrated lime or quicklime to prepare lime slurry at the jobsite or other approved location, as specified. When dry quicklime is applied as slurry, use 80% of the amount shown on the plans.

Distribute slurry uniformly by making successive passes over a measured section of roadway until the specified lime content is reached. Uniformly spread the residue from quicklime slurry over the length of the roadway being processed, unless otherwise directed.

4.4. Mixing. Begin mixing within 6 hr. of application of lime. Hydrated lime exposed to the open air for 6 hr. or more between application and mixing, or that experiences excessive loss due to washing or blowing, will not be accepted for payment.

Thoroughly mix the material and lime using approved equipment. When treating subgrade, bring the moisture content above the optimum moisture content to insure adequate chemical reaction of the lime and subgrade materials. Allow the mixture to mellow for 1 to 4 days, as directed. When pebble grade quicklime is used, allow the mixture to mellow for 2 to 4 days, as directed. Sprinkle the treated materials during the mixing and mellowing operation, as directed, to achieve adequate hydration and proper moisture content. When the material to be treated has a sulfate content greater than 3,000 ppm but less than or equal to 7,000 ppm, mellow for a minimum of 7 days. Maintain in a continuously moist condition by sprinkling in accordance with Item 204, “Sprinkling.” After mellowing, resume mixing until a homogeneous, friable mixture is obtained. After mixing, the Engineer may sample the mixture at roadway moisture and test in accordance with Tex-101-E, Part III, to determine compliance with the gradation requirements in Table 1.

Table 1 Gradation Requirements (Minimum % Passing)

Sieve Size Base Subgrade

1-3/4" 100 100

3/4" 85 85

#4 – 60

4.5. Compaction. Compact the mixture using density control, unless otherwise shown on the plans. Multiple lifts are permitted when shown on the plans or approved. Bring each layer to the moisture content directed.

Sprinkle the treated material in accordance with Item 204, “Sprinkling” or aerate the treated material to adjust the moisture content during compaction so that it is no more than 1.0 percentage points below optimum and

2.0 percentage points above optimum as determined by Tex-121-E. Measure the moisture content of the material in accordance with Tex-115-E or Tex-103-E during compaction daily and report the results the same day, unless otherwise shown on the plans or directed.

Begin rolling longitudinally at the sides and proceed toward the center, overlapping on successive trips by at least 1/2 the width of the roller unit. On superelevated curves, begin rolling at the low side and progress toward the high side. Offset alternate trips of the roller. Operate rollers at a speed between 2 and 6 mph as directed.

Before final acceptance, the Engineer will select the locations of tests in each unit and measure the treated depth in accordance with Tex-140-E. Correct areas deficient by more than 1/2 in. in thickness or more than 1/2% in target lime content by adding lime as required, reshaping, recompacting, and refinishing at the Contractor’s expense.

Rework, recompact, and refinish material that fails to meet or that loses required moisture, density, stability, or finish before the next course is placed or the project is accepted. Continue work until specification http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi101.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi121.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi115.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi103.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi140.pdf requirements are met. Rework in accordance with Section 260.4.6., “Reworking a Section.” Perform the work at no additional expense to the Department.

4.5.1. Ordinary Compaction. Roll with approved compaction equipment, as directed. Correct irregularities, depressions, and weak spots immediately by scarifying the areas affected, adding or removing treated material as required, reshaping, and recompacting.

4.5.2. Density Control. The Engineer will determine roadway density and moisture content of completed sections in accordance with Tex-115-E. The Engineer may accept the section if no more than 1 of the 5 most recent density tests is below the specified density and the failing test is no more than 3 pcf below the specified density.

4.5.2.1. Subgrade. Compact to at least 95% of the maximum density determined in accordance with Tex-121-E, unless otherwise shown on the plans.

4.5.2.2. Base. Compact the bottom course to at least 95% of the maximum density determined in accordance with Tex-121-E, unless otherwise shown on the plans. Compact subsequent courses treated under this Item to at least 98% of the maximum density determined in accordance with Tex-121-E, unless otherwise shown on the plans.

4.6. Reworking a Section. When a section is reworked within 72 hr. after completion of compaction, rework the section to provide the required density. When a section is reworked more than 72 hr. after completion of compaction, add additional lime at 25% of the percentage determined in Section 260.2.6., “Mix Design.”

Reworking includes loosening, adding material or removing unacceptable material if necessary, mixing as directed, compacting, and finishing. When density control is specified, determine a new maximum density of the reworked material in accordance with Tex-121-E, and compact to at least 95% of this density.

4.7. Finishing. Immediately after completing compaction of the final course, clip, skin, or tight-blade the surface of the lime-treated material with a maintainer or subgrade trimmer to a depth of approximately 1/4 in.

Remove loosened material and dispose of at an approved location. Roll the clipped surface immediately with a pneumatic tire roller until a smooth surface is attained.