Revised Picnic Point Vault Toilet Specifications.docx

Picnic Point Vault Toilet Replacement – Chequamegon-Nicolet National Forest

PART 1 – GENERAL

1. SCOPE OF WORK

1.1. Work includes the removal of 1 existing vault toilet, construction, and onsite placement of 1 ADA accessible prefabricated precast concrete vault toilet building, and all associated demolition, preparation, and finish site work including construction of concrete pathway and slab at 1 recreation site.

2. WORK HOURS

2.1. Work shall be conducted between 7:00 am and 5:00 pm on normal workdays, unless approved in writing by CO for unusual circumstances.

2.2. No work will be scheduled May 25th-June 1st, June 29th-July 6th, or August 31st-September 7th.

2.3. Construction Schedules shall be submitted as directed in FAR 52.236-15.

2.3.1. Ensure Construction Schedule meets the requirements within Timing and Other Considerations section of the Demolition and Site Preparation specification.

2.3.2. Provide COR with regular schedule updates, as needed, to communicate timing of key actions impacting use and or closure for public safety at any site. This includes, but is not limited to, closure and opening of toilet facilities, use of cranes, delivery of equipment on large trucks, etc.

2.4. Give written notice to the CO whenever it is desired to perform outside of designated hours, on a weekend, or on a Federal Holiday. If approved, such work may be subject to requirements furnished in writing by the CO and no extra compensation will be allowed.

3. SUBMITTALS

3.1. Coordinate preparation and processing of submittals with performance of construction activities and with the schedule.

3.2. Allow 15 calendar days each for submittal review, corrections following the initial review and re-submittal review before activities scheduled after the submittal approval.

3.3. Submittal Transmittal: Transmit each set of submittals from the Contractor to the Government by use of a Transmittal Cover Sheet (example available upon request). Cover Sheet format to be approved by COR prior to start of use and shall include:

3.3.1. Project name and Forest Service contract number.

3.3.2. Date.

3.3.3. Name, address and telephone number of firm or entity that prepared the submittal.

3.3.4. Names of subcontractor, manufacturer, supplier, etc. as applicable.

3.3.5. Category and description of submittal.

3.3.6. Section of Specifications or Drawing sheet number the Submittal is representing.

3.3.7. Certification by Contractor stating that submittal complies with the Contract, or statement of deviations from the requirements of the Contract.

3.3.8. Signature of transmitter shall indicate they have verified the accuracy, compatibility, and conformance with contract requirements for all included items.

3.3.9. Space to record Contractor's review and approval markings, and for Government response.

3.4. Submit items for review as noted here and as indicated in individual specification sections. Unless otherwise requested by COR, submit PDF electronic file for each item required. This includes but is not limited to Construction Schedule, Shop Drawings, Product Data, Certificates of Compliance, Permits and Approvals, Test Reports, Operation and Maintenance (O/M) Manuals, and Warranties.

3.5. Products subject to shop drawing, product data, or sample review shall not be used in the work until submittals have been reviewed and transmittals have been approved in writing by the COR.

3.5.1. Contractor shall be responsible for confirming and correlating all quantities and dimensions, selecting fabrication processes and means and methods of construction, coordinating its work with that of all other trades, and performing all work in a safe and satisfactory manner.

3.5.2. Submittals will only be reviewed for general conformance with the design concept of the project and general compliance with the information given in the Contract Documents. Corrections or comments made on submittals shall not relieve Contractor from compliance with requirements of Drawings and Specifications and shall not be considered an order for extra work.

3.5.3. Incomplete submittals will be returned to the Contractor with no further review. Delays due to incomplete or rejected submittals will not be excused and no monetary compensation or time compensation shall be provided to the Contractor.

3.5.4. Where manufacturer’s standard literature includes multiple products or options, identify the specific products and options as required for this project. Specific written notice shall be given of each variation that shop drawings and product data may have from requirements of the Contract Documents.

3.5.5. When the Contractor desires to submit for approval a product for an “approved equal”, the Contractor must provide documentation of the original specified product and the Contractor proposed product in a side-by-side comparison, such as a table, which clearly demonstrates the Contractor proposed product meets or exceeds the originally specified product.

4. PAY ITEMS

4.1. Each pay item listed below includes site specific requirements; work under each pay item also includes all requirements of the contract including Drawings and Part 2 Specifications.

Pay Item #1 – Picnic Point Campground Westboro, WI (Lat: 45°18'19.85" N, Long: 90°26'9.76" W) Remove 1 single-user vault toilet from site. Install 1 CXT Double Cascadian (or equivalent) double vault toilet in the footprint of the removed structure.

Install a concrete path which runs from the edge of the parking area to the new vault toilet entrance. Install an apron slab at the building entrance. In addition to the new toilet paper dispenser to be installed, the existing toilet paper dispenser of the removed vault should be removed and re-installed in the new vault alongside a new dispenser.

No large tree removal and grubbing shall occur at this site. Some minor clearing of small brush at the forest edge may be needed.

PART 2 - SPECIFICATIONS

1. DEMOLITION AND SITE PREPARATION

1.1. Submittals

1.1.1. None

1.2. Timing and Other Considerations

1.2.1. If a new toilet building will be installed in the same location as an existing toilet building AND is the only toilet serving the site:

1.2.1.1. Closure may not exceed 96 hours.

1.2.1.2. Closure may not extend over a weekend.

1.2.1.3. Timing must align with approved construction schedule.

1.2.2. For all sites with multiple vault toilets, section 1.4.1 does not apply:

1.2.2.1. Existing vault toilet buildings to be removed and not replaced in the same footprint will remain in service until the new vault toilet is installed and ready for use AND/OR

1.2.2.2. A minimum of one unisex restroom remain open for use at all times during construction when the recreation area is open for use.

1.2.3. The contractor shall maintain a site that is safe for public users and employees at all times during construction.

1.2.3.1. This includes but is not limited to the installation and maintenance of barricades and/or fencing and other protective measures around equipment operations, excavations, and other construction hazards in accordance with 29 CFR Part 1926 and other relevant industry standards.

1.2.3.2. The contractor’s responsibility in this regard begins at the time of construction mobilization and extends until completion and acceptance of the work.

1.3. Removal of Existing Vault Toilet

1.3.1. Existing above-ground structure, concrete slab, and building base shall be removed from government property and become the contractor’s property. If not retained, contractor to dispose of legally off Government property.

1.3.2. Prior to removal of all existing vault toilets, pump and dispose of vault contents by a licensed sewage hauler and disposal service. Dispose of contents legally off Government property.

1.3.3. Maintain erosion control measures to protect the project site and prevent sediment pollution of adjacent water courses and properties as needed.

1.3.4. Removal of existing vaults which will not be within the footprint of a new building shall include the following:

1.3.4.1. Once pumped dry, hole(s) shall be drilled or punched into the bottom as to allow moisture to percolate through the slab

1.3.4.2. Sidewalls shall be removed to 2 feet below proposed grade. Material from sidewalls may be used as backfill for the removed vault hole.

1.3.4.3. Remaining “opening” of the existing vault shall be filled with backfill material conforming to section 2.2.11.2 and compacted using either the bucket of an excavator or a jumping-jack style compactor.

1.3.4.4. Cap and restore the site according to Section 4: Site Cleanup and Restoration.

1.3.5. Removal of existing vaults which will be within the footprint of a new building shall include the following:

1.3.5.1. The vaults shall be handled in such a way that no contents of the vault are spilled or dumped onsite.

1.3.5.2. Vaults shall become property of contractor and be removed from the site. If not retained, contractor to dispose of legally off Government property.

1.3.5.3. Over-excavation resulting from the removal of the existing vault shall be backfilled with material conforming to section 2.2.11.2 and compacted with either the bucket of an excavator or a jumping-jack style compactor.

1.4. Clearing and grubbing

1.4.1. Clearing and grubbing shall result in minimal disturbance to the site while still allowing work to be accomplished

1.4.2. Tree removal shall be as noted in each bid item. Any tree removal not noted in the bid items must be approved by the COR prior to cutting.

1.4.2.1. All timber from tree removal shall be cut into 8’ lengths and neatly placed onsite as directed by the COR.

1.4.3. Brush produced from clearing and tree removal shall be disposed of on site as per direction of the COR.

1.4.4. All stumps from clearing and tree removal shall be excavated from the site and disposed of on site as per direction of the CO and considered incidental (having no separate pay item).

1.4.5. Protect all trees which are not to be cut from damage during work.

2. VAULT TOILET

2.1. Submittals

2.1.1. Vault Toilet Structures

2.1.1.1. Include all applicable shop drawings, product data, O/M manuals, warranties, or other documents.

2.1.1.2. List the sites at which each structure submitted shall be used. Any variation in a specific structure shall be clearly described and included in the submittal.

2.1.2. Base Course Material

2.1.2.1. Product data and test reports

2.1.3. Backfill Material

2.1.3.1. Product data and test reports

2.2. Materials

2.2.1. Manufacturer

2.2.1.1. Manufacturer shall be CXT or pre-approved equal. The salient characteristics used to determine an “or equal” are listed in Section 2.1.

2.2.2. Vault:

2.2.2.1. There shall be one vault for each toilet riser.

2.2.2.2. All interior vault surfaces shall be sealed to prevent leaking and absorption of odors into the material used to construct the vault. If the building floor slab is the top of the vault, then the underneath side of the floor slab (top interior of the vault) shall be sealed to prevent odor absorption. Sealer shall consist of a deep penetrating, high alkali resistant, low volatility product.

2.2.2.3. The vault shall have a black interior to help prevent the visitor from seeing the waste when looking down the toilet riser unless otherwise approved by COR in writing. Do not use bituminous materials for coating the vault because that material is food for bacteria.

2.2.2.4. The vault shall have a minimum bottom slope of 1 inch per foot from under the toilet riser out to the outside cleanout area so that the waste can be more thoroughly removed.

2.2.2.5. The vault shall have a 24-inch diameter (minimum equivalent area) lightweight manhole cover installed to the rear or side of the building. The manhole cover must be sealed to prevent air and water from entering the vault. The manhole cover shall be lockable with a padlock and raised, with the surrounding concrete sloped away with a minimum slope of 1/2 inch per foot.

2.2.2.6. The size of the vault shall be minimum 1,000 gallons for each toilet riser in the structure.

2.2.2.7. The depth of the vault shall be no deeper than 5 ft.

2.2.3. Building Interior Floor Surface:

2.2.3.1. The floor shall be sloped a minimum of 1/8 inch per foot and a maximum of 1/4 inch per ft. from the back to the front door so that water will not "pocket" and cleaning will be easier.

2.2.3.2. The floor shall be completely sealed to prevent any staining or odor absorption.

2.2.3.3. The floor shall have a non-slip surface only in the walkway area.

2.2.3.4. The wall to floor surfaces shall have a large radius coving (4 to 6 inches) and all 90° corners shall be rounded.

2.2.3.5. The floor shall evenly join the outside concrete so that there is no lip at the doorway to hinder people with disabilities from entering.

2.2.4. Interior Building Walls and Ceiling:

2.2.4.1. The walls shall be nonporous.

2.2.4.2. The walls shall be light in color to assist in reflecting available light unless otherwise approved by COR in writing

2.2.4.3. The walls shall be difficult to write on and/or designed to be easily cleaned.

2.2.4.4. The walls shall be free from ledges, angles, and shelves to minimize dirt accumulation and ease cleaning.

2.2.5. Building Structural Requirements

2.2.5.1. The building supplied shall have the following structural design loads:

2.2.5.1.1. Floor bearing capacity shall be a minimum of 40 psf.

2.2.5.1.2. Roof live load shall be a minimum 60 psf for snow loading.

2.2.5.1.3. Vault buildings will withstand the effects of 100 miles per hour wind exposure class C winds.

2.2.5.2. OR building shall have structural design loads greater than or equal to those salient to CXT Cascadian and Double Cascadian buildings as specified in Section 4.0 of the CXT product specification (online: http://www.cxtinc.com/pdf/Specs/Cascadian_Vault_Specs.pdf)

2.2.6. Toilet Riser:

2.2.6.1. The riser shall have no cracks and crevices on the outside for potentially odorous materials to collect in.

2.2.6.2. The riser shall have a heavy-duty open front seat and cover assembly that does not seal the air out.

2.2.6.3. The riser shall be easy to clean and impervious to oxidizing cleaning agents.

2.2.6.4. The riser shall be vandal resistant.

2.2.7. Toilet Paper Dispenser:

2.2.7.1. A three-roll lock-bar toilet paper dispenser shall be provided and installed for each vault stall.

2.2.8. Air Vent for the Building:

2.2.8.1. The vent in the building, necessary to supply replacement air for the air drawn out of the vault, shall be near 120 sq. inches of free area for each vault and riser unit.

2.2.8.2. There shall be only one vent opening in each room which contains a toilet riser in the building. The opening shall be placed only on one side of the building (ideally, the side that the prevailing wind blows against). The "side" can be either side, the front, or the back of the building.

2.2.8.3. The vent shall be located "head-high" on the building if there is a constant prevailing wind hitting that side. For shifting winds, the vent shall be placed as low to the ground as possible and on the side that the wind is most predominant during the use period. If there is an up-canyon wind in the morning and a down-canyon wind during the afternoon, then the vent shall be placed on an adjacent wall surface as low to the ground as possible so that wind has the least effect of aspirating air out of the building.

2.2.8.4. The vent shall be constructed of a heavy-duty material, such as expanded metal, in order to prevent vandalism.

2.2.8.5. There shall be no screen in the vent opening unless the size is 1/4-inch mesh (in the least dimension).

2.2.9. Air Vent for the Vault:

2.2.9.1. The vault vent area shall be equivalent to a minimum of 12 inches in diameter. Each vault shall have its own vent.

2.2.9.2. The top of the vent pipe shall be a minimum height of 3 ft. above the highest point of the roof.

2.2.9.3. The 12-inch diameter pipe above the roof shall be painted a dark color to take advantage of potential convection resulting from the sun's energy as the sun heats the pipe.

2.2.9.4. The top of the 12-inch pipe shall remain uncovered and unscreened. If a top is absolutely necessary, it should be a flat plate placed 12 inches above the top of the pipe and supported by three thin metal rods so as not to interfere with the aspiration effects of the wind flowing over the open top pipe.

2.2.10. Appearance:

2.2.10.1. Appearance shall be consistent with the CXT models identified for each pay item. Appearances that differ from the identified CXT model may be submitted as alternate options. The Contracting Officer (CO) will determine whether the proposed alternates meet the desired appearance for use in a National Forest campground.

2.2.10.2. Vault toilet building appearance shall conform to the following unless otherwise noted in specific Pay items or approved by CO:

2.2.10.2.1. Exterior finish shall be “board and bat” upper texture and “horizontal lap siding” lower texture

2.2.10.2.2. Roof finish shall be a cedar shake texture

2.2.10.2.3. Exterior finish color shall be “Coca Milk” or equivalent

2.2.10.2.4. Interior finish shall be smooth

2.2.10.3. Contractor is responsible for all touch-up painting

2.2.10.4. All vault buildings shall have signage conforming to the following:

2.2.10.4.1. All vault toilets shall have handicap-accessible signage.

2.2.10.4.2. Single vault building shall have unisex signage. Double vault buildings shall have “Men” signage to one vault and “Women” signage to the other vault.

2.2.10.4.3. All signage shall be weather-resistant and shall be clearly and neatly posted.

2.2.10.4.4. Signage from existing vaults structures may be used with specific COR approval where signage is in good condition and matches other site signage aesthetics.

2.2.11. Installation Materials

2.2.11.1. Bedding course shall be well graded, crushed, gravel with 100% passing the 1” sieve and less than 10% passing the #200 sieve.

2.2.11.2. Backfill shall be well graded, compactable material free of excess moisture, muck, frozen lumps, roots, sod, or other deleterious material, with maximum particle size of 3 inches, and soil classification meeting AASHTO M 145 A-1, A-2-4, A-2-5, or A-3. Native material may be used as backfill where it meets these characteristics.

2.3. Installation

2.3.1. Installation of new vaults and buildings shall be in accordance with all manufacturer directions and specifications.

2.3.2. Contractor is responsible for removal of the existing vault and clearing and grubbing per Section 1: Demolition and Site Preparation.

2.3.3. Vault toilet floor shall be installed at an elevation that provides positive drainage away from the building and sidewalk while providing an ABA compliant route to the entrance, the contractor shall provide excavation and fill as required by site to meet these requirements. Finished topsoil shall be graded to be 1”-2” below that finished floor elevation where it meets the building. Compact bottom of excavation with vibratory or plate compactor prior to placement of aggregate bedding. Make 3 passes minimum with compacting equipment.

2.3.4. Place a minimum 1.0-foot compacted depth of aggregate bedding material. Bedding shall occupy a plan area 2 feet wider and 2 feet longer than the vault to be placed. Place in 6-inch lifts and compact with a vibratory compactor. Use a sand leveling course as needed to ensure a level placement of vault per CXT installation instructions.

2.3.5. Placement of the new vault shall be as shown on the drawings over the footprint of vault demolished.

2.3.6. Backfill and compact the excavation surrounding the placed vault and, if present, the vacant footprint of the second removed vault.

2.3.7. Finished grading, topsoil, seeding, and cleanup requirement shall be in accordance with Section 4: Site Cleanup and Restoration.

3. CONCRETE

3.1. Submittals

3.1.1. Concrete

3.1.1.1. Product data and test reports

3.1.1.2. Concrete mix design.

3.1.2. Base Course Material

3.1.2.1. Product data and test reports

3.2. Materials

3.2.1. All concrete shall be ready-mixed concrete from a producer possessing ASTM C 94/C 94M qualifications.

3.2.2. Concrete shall comply with ACI 301, "Specification for Structural Concrete," and with ACI 117, "Specifications for Tolerances for Concrete Construction and Materials."

3.2.3. Submittals of concrete design mixtures shall be provided to the CO a minimum of 5 calendar days prior to concrete placement.

3.2.4. Materials shall conform to the following unless otherwise approved by the CO

3.2.4.1. Portland Cement: ASTM C 150, Type I or II.

3.2.4.2. Fly Ash: ASTM C 618, Class C or F.

3.2.4.3. Ground Granulated Blast-Furnace Slag: ASTM C 989, Grade 100 or 120.

3.2.4.4. Silica Fume: ASTM C 1240, amorphous silica.

3.2.4.5. Aggregates: ASTM C 33, Class 4S, coarse aggregate or better, graded.

3.2.4.6. Maximum Coarse-Aggregate Size: 1-inch (25 mm) nominal.

3.2.4.7. Air-Entraining Admixture: ASTM C 260.

3.2.4.8. Chemical Admixtures: ASTM C 494 as approved by CO. Do not use calcium chloride or admixtures containing calcium chloride.

3.2.4.9. Rebar: ASTM A615, Bar #3, Grade 40.

3.2.4.10. Clear, Waterborne, Membrane-Forming Curing and Sealing Compound: ASTM C 1315, Type 1, Class A.

3.2.4.11. Joint-Filler Strips: ASTM D 1751, asphalt-saturated cellulosic fiber, or ASTM D 1752, cork or self-expanding cork.

3.2.5. Concrete mixtures shall meet the following requirements unless otherwise approved by the CO

3.2.5.1. Minimum Compressive Strength: 4500 psi (31 MPa) at 28 days.

3.2.5.2. Maximum Water-Cementitious Materials Ratio: 0.45

3.2.5.3. Air Content: Maintain within range permitted by ACI 301.

3.2.5.4. Limit use of fly ash to 25 percent replacement of portland cement by weight and granulated blast-furnace slag to 40 percent of portland cement by weight; silica fume to 10 percent of portland cement by weight.

3.2.6. Measure, batch, mix, and deliver concrete according to ASTM C 94.

3.2.6.1. When air temperature is above 90 deg F (32 deg C), reduce mixing and delivery time to 60 minutes.

3.3. Installation

3.3.1. General Concrete Installation

3.3.1.1. A 6-inch compacted bedding course is required under new concrete.

3.3.1.1.1. Bedding course shall be well graded, crushed, gravel with 100% passing the 1” sieve and less than 10% passing the #200 sieve.

3.3.1.2. Bedding course shall be compacted by a vibratory compactor prior to concrete forming and placement.

3.3.1.3. Construct formwork according to ACI 301 and maintain tolerances and surface irregularities within ACI 347R limits of Class A, 1/8 inch (3.2 mm) for concrete exposed to view and Class C, 1/2 inch (13 mm) for other concrete surfaces.

3.3.1.4. Install rebar, construction, isolation, and contraction joints as indicated in drawings. Install full-depth joint-filler strips at isolation joints.

3.3.1.5. Place concrete in a continuous operation and consolidate using mechanical vibrating equipment.

3.3.1.6. Protect concrete from physical damage, premature drying, and reduced strength due to hot or cold weather during mixing, placing, and curing.

3.3.1.7. Slab Finishes: Comply with ACI 302.1R for screeding, re-straightening, and finishing operations for concrete surfaces. Do not wet concrete surfaces.

3.3.1.7.1. Sidewalk and apron finishing shall be broom-finished on exposed surfaces with a grain perpendicular to the walking direction of the sidewalk.

3.3.1.8. Apply membrane-forming curing and sealing compound to concrete immediately following finishing. Cure formed surfaces by moisture curing for at least seven days.

3.3.1.9. Protect concrete from damage. Repair and patch defective areas.

3.3.2. Concrete Testing

3.3.2.1. Contractor will engage a testing agency to perform field tests and to submit test reports to contractor and owner.

3.3.2.1.1. Daily testing shall be performed on first batch delivered from batch plant to each site.

3.3.2.1.2. If concrete pour on a single site:

3.3.2.1.2.1. Extends to multiple days, samples must be collected daily.

3.3.2.1.2.2. Requires more than 50 CY poured, sample every 50 CY.

3.3.2.1.2.3. Changes concrete batch plant or mix design, sample the first batch from the new plant or design.

3.3.2.2. The following tests shall be performed on each test sample

3.3.2.2.1. Air content and slump shall be measured onsite at time of concrete placement

3.3.2.2.2. Compressive strength: Four cylinders shall be poured and three shall be broken at 7, 14, and 28 days. The fourth cylinder shall be held to be broken as needed.

3.3.3. Walkway Construction

3.3.3.1. Contractor is responsible for removal of the existing walkways, excavation and backfill, installation of new reinforced concrete walkways as described in pay items, and minor site grading around the new walkway

3.3.3.2. Strip topsoil for reuse and excavate other native materials to the elevation required for installation of the specified base and concrete walkway.

3.3.3.3. Walkway shall be cast-in-place concrete 4 inches thick and level with the finished adjacent ground surface; walkway width shall be 36 inches.

3.3.3.4. Walkway shall conform to the following slope requirements:

3.3.3.4.1. All walkways shall be in compliance with standards set in Architectural Barriers Act (ABA) Chapter 4: Accessible Routes.

3.3.3.4.2. Walkways shall have a running slope of no greater than 5% (1:20) unless otherwise called for in drawings.

3.3.3.4.3. Walkways shall have a cross-slope not less than 0.5% to allow surface drainage and not greater than 2% (1:48) to comply with ABA requirements.

3.3.4. Apron Slab Construction:

3.3.4.1. Contractor is responsible for excavation and backfill, installation of concrete apron at building entrance, and minor site grading around the new apron

3.3.4.2. Apron shall be cast-in-place concrete 6 inches thick and level with the finished adjacent ground surface; the apron shall be the length of the vault building and extend 48 inches from the toilet entrance.

3.3.4.3. Dowel concrete apron into the precast base of the vault toilet building.

3.3.4.4. Apron shall conform to the following slope requirements:

3.3.4.4.1. Aprons shall be sloped directly away from the building to allow surface drainage off the slab and prevent pooling around the building.

3.3.4.4.2. Apron slopes shall be not less than 0.5% and not greater than 2% (1:48) in any direction and shall be a consistent slope across the apron.

4. SITE CLEANUP AND RESTORATION

4.1. Submittals

4.1.1. Topsoil

4.1.1.1. Product data, test reports, and NNIS certification.

4.1.2. Seed mixtures

4.1.2.1. Product data.

4.1.3. Replacement pavement

4.1.3.1. Product data and test reports for any concrete or asphalt used to replace damaged pavement.

4.2. Materials

4.2.1. Topsoil:

4.2.1.1. Placed topsoil shall be free of excess moisture, muck, frozen lumps, roots, sod, or other deleterious material with a 3-inch maximum particle size.

4.2.1.2. Topsoil hauled into the site (non-native material) shall be certified Non-Native Invasive Species (NNIS) free.

4.2.1.3. Native material stockpiled during excavation may be used as topping material where the native material conforms to the characteristics described in section 4.2.1.1.

4.2.2. Grass Seeding:

4.2.2.1. Grass seed and mulch shall be contractor furnished and certified weed free.

4.2.2.2. For lawn areas use 50:50 perennial Canadian rye and annual oats.

4.2.2.3. For non-lawn areas us WISDOT mix 75.

4.2.2.4. Mulch shall be straw mulch unless otherwise approved by the CO.

4.3. Installation

4.3.1. Grade area directly around new structure to drain away from vault. All other disturbed ground shall be restored to natural grade.

4.3.1.1. Place 2”-3” of lightly compacted topsoil over backfill for all disturbed soils.

4.3.2. Excess material from excavation or from the contractor shall be removed from Forest Service property unless otherwise approved or requested by the CO.

4.3.3. Seed and mulch all disturbed soils.

4.3.3.1. For lawn areas apply seed at 2 pounds per 1000 square feet.

4.3.3.2. For non-lawn areas apply seed at 0.7 pounds per 1000 square feet.

4.3.3.3. Apply straw mulch uniformly to all seeded areas at a loose depth of 1 to 2 inches.

4.3.3.4. Maintain seeded areas until contract final inspection. Over-seed and/or mulch areas patchy or non-growing areas.

4.3.4. All disturbed, mulched, or seeded area shall be kept free of all invasive species and weeds (includes all plants which are not in the specified seed mix or are not both native and present onsite already).

4.3.5. Protect all existing concrete and asphalt surfaces which are not to be removed. Any damaged pavement sections shall be neatly saw cut and replaced in kind to by the contractor at no expense to the Government.