SOW_Toadlena_SDV_0001.pdf

Scope of Work Sheep Dip Vat (SDV) Site Removal

Toadlena SDV, San Juan County, New Mexico

INTRODUCTION

The Bureau of Indian Affairs (BIA) Navajo Regional Office (NRO) Branch of Environmental Management (BEM) is seeking an Environmental contractor to conduct the removal of the former Toadlena Sheep Dip Vat (SDV) structures and contaminated soil. The Toadlena SDV is located approximately 24 miles along NM Highway 134. Along Highway 134, at mile marker 11 an exit with a sign marker indicating "Berland Lake 5.5 miles" pointing north on a dirt road leads to the SDV site. The SDV site is located on the Navajo Indian Reservation with coordinates of N36 12’ 16.0” W108 55’ 42.2”. The surrounding land use of the area is undeveloped and is primarily used for grazing and wildlife habitat.

BEM is conducting the voluntary cleanup for the Sheep Dip Vat (SDV) site under the authority of Comprehensive, Environmental Response Compensation and Liability Act of 1980 (CERCLA) which will require the complete removal of SDV structures and contaminated soil at the site. The contractor will conduct site characterization to identify contamination of organochlorine pesticide and toxaphene.

The primary soil screening value for toxaphene is set for 0.49 parts per million (ppm) protective of human health and the environmental as required by the Navajo Nation Superfund Program. BIA under the voluntary cleanup involves the permanent removal of a sheep dip vat structures and associated toxaphene contaminated soil from the Navajo Nation as regulated by the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) (40 CFR 300).

BACKGROUND

The Toadlena SDV site description includes all former SDV structures which are still intact and onsite. The pre and post dip pads, dip vat, heater pad and the disposal pit are visible. Most of the corral logs are heaped on to the dip vat trench but the concrete vat is visible and contains water. There are livestock within the area, but there are no nearby residents. The ground surface is relatively flat and consists of dirt, natural desert vegetation and weeds; underlain by flood-plain alluvium, consisting of gray to lavender-tan moderately well-sorted fine sandy and clayey silt and fine sand.

The former SDV was used to apply toxaphene to the livestock, primarily sheep, to eradicate skin conditions and ticks. The dip vat is a concrete lined subgrade trough with an entrance to the dip vat is a concrete pad that funnel livestock (sheep) into the trough (vat). Sheep were herded into the dip vat using a chute, swam through the pesticide solution and exited out of the trough on the other end and used to supply the water to the vat by way of underground piping and plumbed through an aboveground boiler which was used to warm the water.

The pesticide solution was discharged to the unlined pits through valve box.

The contractor shall collect samples through an approved soil boring method and analyzed by EPA Method 8081. Samples will be sent to a certified laboratory for analytical results. Sampling will be conducted throughout the SDV site and a sampling plan shall be developed and approved by BEM prior to any field activities.

PERIOD OF PERFORMANCE: The period of performance will be 120 calendar days from Notice to Proceed.

TASK 1: Pre-Submittals A. Prepare a detailed Work/Sampling Plan and the Project Schedule for BEM’s review and approval prior to commencement of work. The plan should document the proposed work, soil sampling, and options for excavation and off-site disposal activities. The work plan shall include traffic routes, dust control, communication plan with the general public who may live in this area.

B. Prepare a Health and Safety Plan (HASP). The contractor shall prepare a site-specific HASP in accordance with 29 CFR 1910.120 to allow for the protection of workers, employers, and the general public. The HASP will contain certifications/licensures or workers and describe the use of all and appropriate PPE. Task-specific physical hazards and other hazards that may be encountered during work at the sites. Known and potentially occurring environmental hazards are exposure to petroleum hydrocarbons, potentially explosive atmosphere conditions, and tripping/falling hazards, presence of heavy equipment, utility lines, biological hazards, chemical hazards, and venomous insects, snakes/spiders. Plan shall include safety practices for COVID-19.

C. Grid soil sampling plan is to delineate toxaphene contamination that exceed the Regional Screening Levels (RSL) at the investigated area near the exit and entrance pads of the SDV and may extend beyond if disposal pit is found or observed.

D. Letter notification to NNEPA Superfund Program, Window Rock, Arizona on the proposed work shall be prepared by the contractor on behalf of BEM to include proposed work and response to their questions.

E. Name of the accredited and certified laboratory to analyze the samples using EPA method 8081A.

TASK 2: Coordination/Sampling/Analyses A. Contractor shall coordination meetings with the Regulatory Agencies on the Voluntary Compliance event to receive input and comment on the proposed work plan, sampling plan and work schedule for the Toadlena SDV. Contractor shall be available to participate in meetings and present findings of the soil sampling, results and proposed work at the site.

B. Confirmation of the extent of contamination must be verified by laboratory analyses of soils for each and analyzed for organochlorine pesticides analysis by EPA Method 8081A.

C. The contractor shall prepare a map, grid and table showing the Global Positioning System (GPS) the location of the sampling points and the results of the sampling area. Contractor shall provide where the SDV is located and associated developments to document where the items were located prior to removal.

D. Other sampling requirements maybe identified following consultation with NNEPA. The sampling protocols will be identified and bid submittal by the contractor will be sent to the contracting officer for inclusion in the Statement of work (SOW) without further advertisement.

TASK 3: Removal Actions

A. All sheep dip vat structures onsite shall be removed. This includes any wooden posts, concrete pads, and associated development structures such as piping shall be removed by the contractor.

B. All estimated cubic yards of contaminated soils shall be removed by contractor and backfilled with clean soils.

TASK 4: Soil Sampling- SDV perimeter with RSL exceedance.

The soil sampling results shall be included in a draft report to BEM. Based on sampling result data, the maximum depth of the excavation shall be determined by the contractor. Detailed maps shall be produced by the contractor to display options for excavation required to remove all toxaphene impacted soil in excess of the RSL. If confirmation samples contain toxaphene in exceedance of the RSL, an additional round of sampling shall be conducted if feasible.

Soil samples taken at the extended area shall be submitted to accredited laboratory to be analyzed for toxphene using EPA Method 8081A. The complete analytical data reports from the laboratory shall be provided to BEM and show the extent of toxaphene contamination at the perimeter areas as recommended. If the soil is contaminated with toxaphene the soil shall require removal. Soil samples taken at the extended area shall be submitted to accredited laboratory to be analyzed for toxphene using EPA Method 8081A. The complete analytical data reports from the laboratory shall be provided to BIA before excavation occurs to show the extent of toxaphene contamination beyond the current perimeter.

TASK 5: Excavation

The remedial action for the Toadlena SDV site is based on the data obtained from the preliminary site investigation to conduct the excavation and off-site disposal of the contaminated soil/concrete to a Subtitle D landfill. The objective of the SOW is to remove the risk of exposure of contaminated soils at the site.

A. The remedial action shall require the contractor to excavate toxaphene impacted soils and toxaphene– impacted concrete. The removal of contaminated soil will also include the perimeter of areas if the samples show exceedance of the RSL.

B. The contractor shall provide the amount of contaminated soils that shall be removed beyond the perimeter of the SDV site based on soil sampling results. Should additional excavation be required for the areas that are sampled, contractor shall provide the cubic yards to be removed with a detailed cost analysis before excavation is conducted.

C. The excavated areas will be backfilled with clean soil. Contractor shall fill all voids and the excavated area with clean fill and compact the area to 90% proctor density; grade and contour the area to prevent ponding or subsidence and meet the existing grad elevations contours. Care shall be taken by the contractor conducting the backfilling of the excavated area. Backfill sources shall be provided to BIA by the contractor.

D. As needed, contractor shall wet down the areas to minimize dust control during the excavation process. A Project manager shall be onsite for the entire duration to oversee the project and assure the safety of field staff conducting the work.

A. Prepare a detailed Work/Sampling Plan and a Project Schedule for BEM’s review and approval prior to commencement of work. The plan should document a proposed backfill process, the inspections for the monitoring of any potential wells. The work plan shall include traffic routes, dust control, communication plan with employees and the general public, backfill sources, approach to inspections of the monitoring wells and injection piping anticipated for replacement. Costs shall be provided to BEM before replacement occurs.

B. Prepare a Health and Safety Plan (HASP). The contractor shall prepare a site -specific HASP in accordance with 29 CFR 1910.120 to allow for the protection of workers, employers, and the general public. The HASP will contain certifications/licensures or workers and describe the use of all and appropriate PPE. Task-specific physical hazards and other hazards that may be encountered during work at the sites. Known and potentially occurring environmental hazards are exposure to petroleum hydrocarbons, potentially explosive atmosphere conditions, and tripping/falling hazards, presence of heavy equipment, utility lines, biological hazards, chemical hazards, and venomous insects, snakes/spiders.

TASK 6: Disposal

Contractor shall provide traffic plan to ship out the contaminated soils and concrete. The removal of all concrete dip vat, entrance, and exit pads and associated piping/concrete structures shall be excavated and disposed of a Subtitle D landfill. The San Juan County Landfill in Aztec, NM is closest permitted Subtitle D Landfill that accepts non-hazardous waste construction and demolition debris. For estimating purposes, contractor will provide the name of the disposal facility for the soil and concrete to be transported.

Contractor shall assure all documentation for the disposal are maintained and if manifests are required and a BIA BEM official shall sign off and shall be provided in the final reports. The contractor or subcontractor may not sign the manifests on behalf of the BIA BEM.

Task 7 -Reports The contractor will develop a draft and final report containing A. A description of the work performed and figures showing the sampling locations and results.

B. Maps, Tables with GPS coordinates and drawings of sampling locations shall be included. Sample log, field forms, photographic logs suitable for an explanation of findings/work will be presented in the report.

C. Full documentation shall be maintained for all field testing, results and project completions. During field situations, the contractor shall maintain a daily log and record all events relevant to a task order. Any additional sub-contractors shall do likewise. The logs will be signed and closed daily. The logs shall become the property of BIA. A copy of all bills, receipts and time sheets shall be maintained, in case there is a possible claim for cost recovery.

E. Draft/Final Report 10 days. The draft report documenting all activity, findings and progress soils sampling, excavation, and disposal shall be submitted to BIA for review and comment. The final report shall include all drawings, photographic logs, and borings depth.

F. When the draft is approved to finalize, the contractor shall prepare five (5) final copies and four (4) electronic copies in Microsoft Word format two (2) read only and one (1) writeable version marked for “BIA Use Only”.

The BIA shall be the owner of all documents prepared by the contractor. The contractor shall not copyright or write protect any documents or utilize any data from the project without consent of the government.

G. Environmental Professional Certification: the report shall be stamped and certified by an environmental professional that the work was conducted in accordance with work plan and applicable environmental federal regulations.

Acceptance Requirements: The COR, in consultation with the Branch of Environmental Management (BEM) and possibly representatives of the United States Environmental Protection Agency (USEPA) and Navajo Nation Environmental Protection Agency (NNEPA), will determine the acceptability of work performed. If, and when, any agent of the Navajo Nation communicates with the contractor, BEM CO shall be immediately informed.

The contractor may not communicate project work on behalf of the federal government or offer SDV site materials to the general public.

INSTRUCTIONS, CONDITIONS AND NOTICES TO CONTRACTORS

Special conditions

The contractor shall adhere to all applicable federal and tribal laws and regulations and payment of tribal taxes.

The contractor shall be required to furnish electrical power and procure water to perform the remedial actions for toxaphene cleanup. All testing equipment or solid waste shall be removed on daily basis from the site.

Contractor shall not donate concrete or any materials to the local public due to potential liability issues for BIA and the contractor.

All contact with the general public, private and regulatory community shall be made through BIA, BEM COR.

No information may be released without written consent of the BIA Navajo Region BEM.