A06_1-Attachment4-StatementOfWork.docx

STATEMENT OF WORK

MRRD Saw Shop Insulation Remediation Rodent/Waste Cleanup/Rodent Proofing & Insulation Removal/Replacement

MRRD 40006

MRRD 40006

Mogollon Rim Ranger District Coconino National Forest

LOCATION

Mogollon Rim Ranger District (MRRD)

The Happy Jack Work Center (HJWC) Saw Shop is located at 133 Fire Center Road Happy Jack, AZ 86024, approximately 39 miles south of Flagstaff. Travel from Flagstaff on Lake Mary Road South to 133 Fire center Road. Turn right at the Happy Jack Work Center administrative site. Coordinates for the compound are latitude 34.742303, longitude -111.408910. See Appendix A-2

BACKGROUND

Hantavirus Pulmonary Syndrome (HPS)

Hantavirus Pulmonary Syndrome (HPS) is a severe, sometimes fatal, respiratory disease in humans caused by infection with a hantavirus.

Anyone who encounters rodents that carry Hantavirus is at risk of HPS. Rodent infestation in and around the home remains the primary risk for Hantavirus exposure. Even healthy individuals are at risk for HPS infection if exposed to the virus.

In the United States, deer mice (along with cotton rats and rice rats in the southeastern states and the white-footed mouse in the Northeast) are the reservoir of the virus. The rodents shed the virus in their urine, droppings, and saliva. The virus is mainly transmitted to people when they breathe in air contaminated with the virus.

When fresh rodent urine, droppings, or nesting materials are stirred up, tiny droplets containing the virus get into the air. This process is known as "airborne transmission".

There are several other ways rodents may spread Hantavirus to people:

· If a rodent with the virus bites someone, the virus may be spread to that person, but this type of transmission is rare.

· Researchers believe that people may be able to get the virus if they touch something that has been contaminated with rodent urine, droppings, or saliva, and then touch their nose or mouth.

· Researchers also suspect people can become sick if they eat food contaminated by urine, droppings, or saliva from an infected rodent.

Any activity that puts you in contact with rodent droppings, urine, saliva, or nesting materials can place you at risk for infection. Hantavirus is spread when virus-containing particles from rodent urine, droppings, or saliva are stirred into the air. It is important to avoid actions that raise dust, such as sweeping or vacuuming. Infection occurs when you breathe in virus particles.

SCOPE OF WORK

MRRD, HJWC 40006, Happy Jack Saw Shop The work at the Happy Jack Saw Shop will consist of rodent/waste cleanup of the interiors of the site. The contractor shall remove ceiling panels and all insulation in the attic. Contractor shall remove panels on the interior walls of the building and dispose of exposed insulation. The contractor shall rodent proof the structure. The Square Footage for the Happy Jack Saw Shop is 1572 sq ft. The affected area requiring insulation is estimated to be 492 sq ft. This work shall include sealing exterior gaps on the home using a combination of clear acrylic caulk, expandable foam and ¼ by ¼ inch hardware cloth. The existing screens in the crawl space/attic shall be replaced with a durable ¼ by ¼ inch hardware cloth and using expandable foam as necessary. All existing insulation should be removed and disposed according to industry standards. Sanitize the crawl space with an appropriate solution as described in disinfecting solutions in this document.

TASKS

The Tasks for performing the work activities are outlined as follows:

General Tasks:

The Contractor shall provide all labor, materials, tools, equipment, PPE, services, testing, personnel, supervision, and incidentals necessary to perform the work of (1) rodent/waste cleanup, rodent proofing of building, and insulation removal/replacement (2) solid waste removal and disposal. The Contractor shall comply with the Federal Regulatory Agencies: U.S. Environmental Protection Agency (EPA), U.S. Housing and Urban Development Agency (HUD), U.S. Occupational Safety and Health Administration (OSHA), U.S. Department of Transportation (DOT), U.S. Department of Health and Human Services (HHS), U.S. Department of Labor (DOL). They shall also comply with local and State laws; regulation and regulatory agencies; and Arizona Department of Environmental Quality (ADEQ).

Task 1: Rodent/Waste Cleanup, Rodent Proofing Building, and insulation removal/replacement The Contractor shall use safety precautions and cleaning procedures to protect individuals working with or encountering rodent contamination as found in the Center for Disease Control (CDC) report ((Hantavirus Pulmonary Syndrome---United States: Updated Recommendations for Risk Reduction) MMWR 2002; 51[No. RR09]:1-12).

Insulation The contractor shall remove and replace exposed/contaminated insulation in the attic and walls of the Happy Jack Saw Shop. Insulation shall be replaced with minimum R-30 in the attic/roof and minimum R-26 for the exterior walls. The affected areas requiring insulation remediation are estimated to be 492 sq ft out of the building total of 1572 sq ft .

Cleanup of Rodent Urine and Droppings and Contaminated Surfaces The Contractor shall ensure that all personnel working in areas of potential rodent contamination will receive training concerning Hantavirus transmission. During cleaning, all employees shall wear rubber, latex, vinyl, or nitrile gloves.

Prior to disinfection, Contractor shall not stir up dust by sweeping, high pressure spraying, or vacuuming droppings, urine, or nesting materials. This will generate potentially infectious aerosols that can be breathed in more easily.

Contractor shall clean equipment, pallets, and containers outdoors if possible. The risks of Hantavirus are lower outdoors than indoors since the ultraviolet rays in sunlight destroys the virus.

Contractor shall thoroughly wet urine and droppings with a disinfectant (such as Lysol) or a chlorine solution to deactivate the virus. A 10% hypochlorite solution (1½ cups of household bleach in one gallon of water) may be used in place of commercial disinfectant. Once wetted, remove contaminated materials (urine/droppings), and dispose as waste.

After the rodent droppings and urine have been removed, disinfect items (i.e., floors, furniture, cabinets, drawers, and other surfaces) that are designated to remain and might have been contaminated by rodents or their urine and droppings. Disinfect all work surfaces by washing them with a solution of water containing a general-purpose disinfectant and a detergent, followed by an additional wiping-down with disinfectant.

Contractor shall mop all hard-surfaced floors with water containing a general-purpose disinfectant and detergent. Remove rodent nests from furniture or equipment and decontaminate. Materials that cannot be decontaminated should be properly disposed of by the Contractor.

Contractor shall take special precautions for cleaning buildings or areas with heavy rodent infestations. A rodent infestation is considered heavy if piles of feces or numerous nests or dead rodents are observed. These precautions can apply to vacant buildings or structures that have attracted rodents while unoccupied and to dwellings and other structures that have been occupied by persons with confirmed Hantavirus infection.

Before cleaning, ventilate the building or facility by opening doors and windows for at least 30 minutes. Use cross ventilation if possible. Clean up procedures are the same as above.

Persons involved in the clean-up will wear PPE such as but not limited to coveralls (disposable if possible); rubber boots or disposable shoe covers; rubber, latex, vinyl, or nitrile gloves; protective goggles, and an appropriate respiratory protection device, such as a half-mask air-purifying (or negative-pressure) respirator with an N-100 filter or a powered air-purifying respirator (PAPR) with N-100 filters.

All potentially infective waste material (including respirator filters) from clean-up operations should be double bagged in appropriate plastic bags. The bagged material should then be labeled as infectious (if it is to be transported) and disposed of in accordance with local requirements for infectious waste.

Disinfecting Solutions General-Purpose Household Disinfectant. Prepare according to the label, if not pre-diluted. Almost any agent commercially available in the United States is sufficient as long as the label states that it is a disinfectant. Effective agents include those based on phenols, quaternary ammonium compounds, and hypochlorite.

Hypochlorite Solution: A chlorine solution, freshly prepared by mixing 1½ cups of household bleach in 1 gallon of water (or a 1:10 solution) can be used in place of a commercial disinfectant. When using chlorine solution, avoid spilling the mixture on clothing or other items that might be damaged by bleach. Wear rubber, latex, vinyl, or nitrile gloves when preparing and using chlorine solutions. Chlorine solutions should be prepared fresh daily.

Cleanup of Dead Rodents and Rodent Nests Contractor shall wear rubber, latex, vinyl, or nitrile gloves. Use insect repellent (containing DEET) on clothing, shoes, and hands to reduce the risk of fleabites that might transmit plague. Spray dead rodents and rodent nests with a disinfectant or a chlorine solution, soaking them thoroughly.

Place the dead rodent or nest in a plastic bag or remove the dead rodent from the trap and place it in a plastic bag. When cleanup is complete (or when the bag is full), seal the bag, place it into a second plastic bag, and seal the second bag. Dispose of the material in the double bag with all other waste material to be hauled away.

Rodent Proof Structures When inspecting sites for potential rodent entry points, Contractor shall look for rub marks, droppings, tracks, gnawing, or other rodent signs. Contractor shall keep in mind the physical abilities and behavior of rodents, especially their tendency to seek shelter behind, under, or in cabinets, drawers, stored goods, wall voids, false ceilings, and other undisturbed areas.

Contractor shall inspect buildings for openings that permit entry of mice and rats. Specific problem areas include poorly sealed roof and wall joints and edges without properly installed metal flashing; and doors hung unevenly, too high, or lined with unprotected soft rubber weather stripping. In older buildings, cracks in concrete slabs, brick, and concrete block walls, or worn or damaged drain covers allow rodent entry. Gaps or flaws in foundations and slabs, or where the wall framing meets the foundation or slab floor, may provide large enough openings for rodent entry. Older buildings commonly have cracked foundations, cracked plaster or mortar, warped siding, or broken and torn vent screens.

Contractor shall inspect the roll-up or overhead doors (if applicable) since they often provide easy entry for rodents. With the door closed, check for gaps along the sides, bottom, and top of the door. A gap at the top is common. Rats and mice can easily climb up the space between the door and the inner wall or track to the top, where they gain entry and climb down the inside of the track. Gaps between the track and the wall are also common, especially if the track has been installed on brick walls. Door bottoms may be bent or damaged, leaving gaps along the floor. Uneven floors due to frost heaves may leave gaps when the door is closed.

Exclusion Methods Holes and Openings To prevent rodent entry, seal all such holes with durable materials. Steel wool, copper gauze or screen wire packed tightly into openings is a good temporary plug. [By gnawing, rats can gain entry through any opening greater than 1/2 inch across, and mice through any opening larger than 1/4 inch. The paired front (incisor) teeth of rats and mice curve slightly inward. This inward curve makes it difficult for them to gnaw into a flat, hard surface. When given a rough surface or an edge to bite into, however, they can quickly gnaw into most materials.]

For long-term or permanent repair, mix a quick-drying patching plaster or anchoring into a wad of patching plaster before pushing the material into the hole, and smooth over the outside. If steel wool is used, rust stains are likely to result. Holes 3 inches or more in diameter should be covered or backed with 1/4-inch woven/welded hardware cloth prior to filling with a good patching compound. Another backing material available is Strong PatchTM (D. P. Wagner Mfg. Inc.), a 6 x 6-inch sheet metal patch to cover holes up to 5 x 5 inches. It has a self-adhesive backing and a mesh on the surface for better adhesion of the patching compound or other texture. Hardware cloth, if not woven, breaks easily. The woven/welded hardware cloth maintains its shape when cut to fit around pipes or other objects. Hardware cloth used to cover gaps and holes can be filled with foam caulk, Fix-all®, Quick-Fix®, or other fast-drying interior patching compounds.

When used on the exterior, concrete mortar, plaster, or Concrete Patch® can be used to provide longer term rodent-proofing. These are just a few of the many products available. Close openings around augers, pipes, and electric cables where they enter structures with Portland cement mortar, Concrete Patch®, masonry, or metal collars. Even a small, unprotected opening can be an invitation to rodents. The ribs and corrugations in metal siding can be blocked with metal or mortar. Rubber or vinyl weather stops are quickly gnawed through and shall not be used.

Vents and Windows Contractor shall inspect all ventilation openings and windows. If the opening is an access route, install a screen or repair the hole/gap. Check window putty and replace if necessary.

All vents and duct openings for cooling should be screened or raised and/or guarded with an excluder device to prevent rodent entry. In some applications, power vents can be covered with hinged metal plates (louvered) that open with air flow and close when fans are off. These louvers are only effective if they fit tightly, and the sides are recessed to prevent rodents from pushing through them.

Exterior Doors Contractor shall make sure doors should fit tightly with the distance between the bottom of the door and the threshold not exceeding 1/4 inch.

[In some instances, it is possible to build up the threshold rather than modify the door. Metal thresholds can be fastened to floors. Install flashing or a metal channel on the lower edge of doors, particularly softwood doors; a plastic door boot has been successfully used where the door receives low use, and the edges are not easily accessible to rodent gnawing. Properly applied flashing extends to within 1/8 inch (0.3 cm) of the edge of the door at the sides and bottom.]

Contractor shall inspect and if needed close the gap at the top or sides of roll-up doors with conveyor belt material shaped to fit into the side channel frames and mounted on the top door jamb. Bent bottom rails on doors should be straightened, if existing can’t be straightened for a good seal it should be replaced. Concrete damage due to inadequate reinforcement or poor placement practices should be repaired or the concrete replaced. A metal or pipe threshold is sometimes preferable or required.

Foundations and Floors Contractor shall check for gaps or flaws along building exteriors where the wall framing or siding meets the foundation since this provides easy entry for rodents. Such openings should be repaired using well-formed and finished concrete work and installation of tight wall framing and siding or installing metal screed-type flashing between the siding and the foundation. Use of rodent-proof exterior surface materials such as concrete, plaster, or metal sheeting is also effective if properly installed so that all ribs or corrugations are closed.

Contractor shall check to see if rodents gained entry into buildings by burrowing beneath the floor or foundation. A horizontal 1/4-inch mesh wire extension may be added to deflect burrowing rodents away from the foundation.

Contractor shall repair cracks in foundations and floors with concrete or masonry grout. Contractor may use quick-setting types of products, such as Fix-all® or Quick-Fix®, which are for interior use, and Concrete Patch®, Rockite®, or Pour Stone® for interior or exterior use. [The four last-mentioned products are specifically designed for repairs and have quick setting, good adhesion, and non-shrinking properties which make them ideal for exclusion work. Each, however, is made for a specific application: Pour Stone® and Rockite® are designed to be easily poured into cracks in floors or into holes to anchor bolts or machinery and sets and hardens in 15 minutes. Concrete Patch® is a mortar type material for repairing masonry surfaces and has a vinyl polymer to increase adhesion. It sets in 2 hours and is hard after 12 hours. Quick-Fix® is a durable patching plaster for inside use on plaster, drywall, or wood surfaces. Drying time may be within 30 minutes, depending on thickness.]

Rodents can claw and gnaw at concrete and Portland cement until it is fully cured, so the use of 1/2-inch hardware cloth laid in the top ¼ inch of the repair area may be necessary if rats are currently using the repair area as an entry point. Otherwise, provide an effective temporary rodent-proof protective overlay until the concrete is fully cured. Caution: Metal products placed within 1 inch of a concrete surface will oxidize and corrode and may discolor the concrete.

Contractor shall clear and maintain a clean, 3-foot-wide weed-free area around building foundations, concrete slabs, and footings. This often discourages rodents from burrowing as well as eliminates a food source and attractive harborage.

Interior Rodent-Proofing Contractor shall install interior and exterior rodent-proofing to remove all sources of shelter. A combination of actions may be necessary to yield the desired result. An attempt should be made to seal off rodents. Contractor may use traps to remove the rodents, or place poison bait packets through openings in the floor or wall and then seal the openings with galvanized metal or hardware cloth and patching plaster as previously discussed. Promptly treat new openings as they are found.

Eliminate rodent hiding places beneath and behind equipment. Contractor shall stack stored items 18 inches above the floor and 18 to 24 inches away from walls to allow for proper cleaning and inspection. If found warehouse stock should always be stacked off the floor on pallets and away from walls, and it should be rotated often to prevent development of infestations in undisturbed areas.

[Rodents often gnaw into wall materials at corners or where joints in construction materials provide an edge. Poor construction techniques may allow rodents to gain access through materials that are otherwise considered rodent proof.]

Drains and Pipes Contractor shall check to see if rats and mice are using drainage pipes as routes to enter the building. If floor has floor drains, contractor shall equip floor drains with metal grates held firmly in place. Grate openings should not exceed ¼ inch and should not pose a trip hazard.

Physical Barriers/Guards To prevent rodents from climbing or traveling along a particular route, install guards made of sheet metal or similar materials. Guards must be wide enough and positioned to keep rodents from reaching their outer margins by climbing or jumping. A sheet metal band attached to a wall will prevent rodents from climbing. Rodent guards should be at least 14 inches but preferably 18 inches wide. Inside buildings, such guards can prevent rats and mice from climbing at corners. Used in combination with hardware cloth or other suitable material, they can make a building essentially rodent proof.

Task 2: Solid Waste Removal and Disposal The Contractor is responsible for the hauling and disposal of all demolished materials at an appropriate landfill. Contractor shall remove and transport debris in a manner that will prevent spillage on adjacent surfaces and areas. All required notifications and permits are the responsibility of the contractor and must comply with all local, state, and federal guidelines and regulations. Costs for permits are incidental to this item and will not be a separate pay line item.

DELIVERABLES

2 hard copy technical reports and 2 electronic technical reports documenting the sealing and proofing of the buildings. The report shall contain digital photographs and should illustrate the site before and after the sealing and proofing. The digital photographs shall be labeled with location description and date taken. The Contractor shall submit and/or coordinate all deliverables to the Contracting Officer Representative (COR).

Appendix A – Maps

A-1 HJWC

image3.jpeg image4.jpeg image5.png image1.jpeg image2.jpeg