FS Supplemental Project Specs - FS 76 Jordan Bridge.pdf

FOREST SERVICE SUPPLEMENTAL SPECIFICATIONS

FOR

FS 76 Jordan Bridge Replacement

Table of Contents

Bridge Approach Slabs

Piling Excavation

625 - Turf Establishment

625.03 General

625.04 Preparing Seedbed

625.05 Watering

625.06 Fertilizing

625.07 Seeding

625.08 Mulching

625.09 Protecting and Caring for Seeded Areas

625.11 Measurement

BRIDGE APPROACH SLABS

DESCRIPTION

Construct reinforced concrete slabs at bridge approaches, including curbs and sidewalks; furnish and place temporary slope drains; remove existing pavement or approach slab; furnish and place concrete, reinforcing steel, joint filler, sealer and other materials; finish and cure concrete.

Construct the approach slabs after the adjacent bridge deck is cast and before constructing concrete barrier rails or sidewalks.

MATERIALS

Refer to Division 700.

Item Section Curing Agents 711 Joint Filler 712 Joint Sealer 712 Portland Cement Concrete 701 Reinforcing Steel 709

CONSTRUCTION METHODS

Construct the subgrade and approach fills in accordance with the contract.

Apply Section 552 to all concrete except as otherwise provided herein. Use 4500 psi concrete.

Finish and groove the reinforced concrete bridge approach slabs in accordance with Section 552;

however, for approach slabs with a length of 15 feet or less, the contractor may submit an alternate screed type for approval. Do not groove the approach slabs when grooving the bridge deck is not required.

When grooving is not required, apply a broomed texture to the approach slabs before the concrete becomes non-plastic. Cure bridge approach slabs in the same manner as specified for bridge decks in Section 552.

Temporarily cover or fill the opening in the joint at the end bent until installation of the joint seal, if applicable. Make sure that the covering or filler provides for drainage off the bridge deck and keeps debris out of the joint and off the end bent cap.

When shown in the plans, construct sidewalks on bridge approach slabs in accordance with plan details. Do not construct sidewalks until sawing the joint at the end bent. Finish the concrete in accordance with Section 552.

Construct temporary slope drains in accordance with Section 157.11. Locate this erosion control item as shown in the Structure plan detail.

Backfill around the approach slabs as soon as practical to prevent erosion adjacent to the slab.

MEASUREMENT AND PAYMENT

The price and payment below will be full compensation for all items required to construct bridge approach slabs including, but not limited to, those items contained in the description of work.

Temporary Slope Drains shall be considered incidental to this work.

Bridge Approach Slabs ____ will be paid at the contract lump sum price.

PILE EXCAVATION

DESCRIPTION

Perform pile excavation to elevations shown in the plans or approved by the Engineer. Excavate holes at pile locations with diameters that will result in at least 3 inches of clearance all around piles. Before filling holes, support and center piles in excavations and when noted in the plans, drive piles to the required driving resistance. Remove any fluids from excavations and, at the Contractor’s option, fill holes with concrete, grout or flowable fill unless required otherwise in the contract.

Pile Excavation

Use equipment with sufficient capacity to drill through soil, rock, boulders, timbers, man-made objects and any other materials encountered. Do not use blasting to advance pile excavations.

Blasting for core removal is only permitted when approved by the Engineer. Contain and dispose of drilling spoils as directed and in accordance with Section 204.14. Drilling spoils consist of all materials and fluids removed from pile excavations.

If unstable, caving or sloughing soils are anticipated or encountered, use slurry or temporary steel casings to stabilize holes. When using slurry, submit slurry details including product information and additives, manufacturer’s recommendations for use, slurry equipment details and documentation that mixing water is suitable for slurry before beginning drilling. When using temporary casings, use smooth non corrugated clean watertight steel casings of ample strength to withstand handling and installation stresses and pressures imposed by concrete, earth, backfill and fluids. Use steel casings with an outside diameter equal to the hole size and a wall thickness of at least 1/4 inch.

Filling Holes Check the water inflow rate at the bottom of holes after all pumps have been removed. If the water inflow rate is greater than 6 inches per half hour or holes are stabilized with slurry, use an approved method for placing concrete, grout or flowable fill. Otherwise, remove any fluids and free fall concrete, grout or flowable fill into holes. Ensure that concrete, grout or flowable fill flows completely around piles. Place concrete, grout or flowable fill continuously and remove all temporary casings.

MEASUREMENT AND PAYMENT

Pile Excavation in Soil and Pile Excavation Not in Soil will be measured and paid in linear feet.

Pile excavation will be measured as the depth from the ground line to the specified pile excavation elevation or revised elevation approved by the Engineer. Define “not in soil” as material with a rock auger penetration rate of less than 2 inches per 5 minutes of drilling at full crowd force. When not in soil is encountered, seams, voids and weathered rock less than 3 feet thick with a rock auger penetration rate of greater than 2 inches per 5 minutes of drilling at full crowd force will be paid at the contract unit price for Pile Excavation Not in Soil. Seams, voids and weathered rock greater than 3 feet thick will be paid at the contract unit price for Pile

Excavation in Soil where not in soil is no longer encountered. The contract unit prices for Pile Excavation in Soil and Pile Excavation Not in Soil will be full compensation for stabilizing and filling holes with concrete, grout or flowable fill.

Pile Excavation in Soil _______ will be paid per linear loot.

Pile Excavation Not in Soil _______will be paid per linear foot.

625 - Turf Establishment

625.03_gwj_nf_08_15_2012

625.03 General.

Delete this subsection from FP‐14 and replace with the following:

Apply turf establishment to prepared ground or any disturbed area between Jan1 and Dec 31. Apply turf establishment to the areas shown on the plans or worklists within 30 days after completion of ground disturbing activities. Unless otherwise specified in writing by the CO apply turf establishment after each 1,000 foot section of road has been constructed to template lines. Seeded areas damaged by construction activities shall be reseeded within 10 days of the damage. Do not seed during windy weather or when the ground is excessively wet, frozen, or snow covered. Assure that all seed and mulch used in the work conforms to the weed free requirements of Section 713.

625.04 Preparing Seedbed.

Delete entire subsection from FP‐14 and replace with the following:

Ensure that the surface soil is in a roughened condition favorable for germination and growth.

625.05 Watering

Delete entire subsection from FP‐14.

625.06 Fertilizing.

Delete entire subsection from FP‐14 and replace with the following:

Apply fertilizer having a chemical analysis as listed below by the following methods.

(a) Dry Method. Apply the fertilizer with approved mechanical equipment. Hand operated methods are satisfactory on areas inaccessible to mechanical equipment.

(b) Hydraulic method. Use hydraulic‐type equipment capable of providing a uniform application using water as the carrying agent. Add fertilizer to the slurry and mix before adding seed. Add the tracer material when designated by the CO.

Fertilizer. Do not apply fertilizer in areas where drainage will carry runoff toward a waterbody. If necessary, apply no fertilizer. If fertilizer application is acceptable to the CO, apply at the rate of 800 pounds per acre. Ensure that the fertilizer meets the following chemical analysis:

Nutrient Percent

Nitrogen, N

Phosphorus, P205

Potassium, K

625.07 Seeding.

Delete the first sentence from FP‐14 and add the following.

Apply seed mix by the following methods:

(a) Dry method. Delete the third sentence.

Add the following after subsection (b).

Seed Mix. Furnish and uniformly apply the following kinds and amounts of pure live seed:

Quantity of Pure

Type of Seed Live Seed (Lbs/Acre)

1. Annual Ryegrass 50 lb.

2. Fungus Free Tall Fescue 40 lb.

3. *White Dutch Clover 5 lb.

4. Lime, pelletized or pulverized 2000 lb.

* To be inoculated per manufacturer. Germination plus hard seed must be equal to or greater than 75% and the percentage of hard seed no greater than 15%.

Determine the pounds of seed to be furnished per acre by dividing the pounds of pure live seed required per acre by the product of the percent purity and percent germination.

When seeding from October 15 to March 1, 30 lbs/acre of Cereal Rye (Abruzzi) shall be added to the seed mixture.

The contractor shall notify the CO at least 24 hours prior to all seeding.

625.08 Mulching.

Delete the entire subsection from FP‐14 and replace with the following:

Apply Mulch within 12 hours after seeding by the following methods.

(a) Dry Method. Apply mulch with a hand spreader or a spreader utilizing forced air at a rate of

4,000 pounds per acre.

(b) Hydraulic Method. Apply mulch in a separate application from the seed using hydraulic‐type equipment according to Subsection 625.07(b).

Apply wood fiber or grass straw cellulose fiber mulch at a rate of 1,500 pounds per acre.

Apply bonded fiber matrix hydraulic mulch at a minimum rate of 3,000 pounds per acre. Apply so no hole in the matrix is greater than 0.04 inches. Apply so that no gaps exist between the matrix and the soil.

Inaccessible areas may be mulched by hand. Apply mulch uniformly over the entire disturbed area.

625.09 Protecting and Caring for Seeded Areas

Delete the first sentence from FP‐14 and add the following:

Protect and care for seeded areas until final acceptance.

625.11 Measurement.

Delete the entire Subsection from FP‐14 and replace with the following:

Measure the Section 625 items listed in the bid schedule according to Subsection 109.02.