Scenario_2_SOW_Martha_Ann2_TCR.pdf

Solicitation: 1291S8-18-R-0001 Attachment #2

SITE SCENARIO 2

Statement of Work For a

Removal Action at the Martha Ann Mine Site, Los Padres National Forest

Description/ Statement of Work/ Specifications

Project Description:

The USDA Forest Service is exercising its lead agency authority under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) to undertake a time-critical removal action at the Martha Ann Mine Site. The purpose of this work is to address the mercury impacted soil at the site as well as the six 55 gallon drums at the site that contain hydrocarbon fuel (likely degraded gasoline), cyanide and sulfuric acid; 10 old vehicle batteries and the 10 paint buckets full of hardened paint and mercury impacted soil; 8 flasks of mercury. Some of the hazardous materials (3 drums of fuel and 4 paint buckets) are stored outside, while the remaining (2 drums of cyanide, 1 drum of sulfuric acid, 10 vehicle batteries, 6 paint buckets, 8 flasks of mercury and 3 deteriorated bags of ammonium nitrate) hazardous materials are stored in the building located next to the retort. The 55 gallon drums are full, some of the containers have deteriorated and the content has spilled onto the surrounding soil. The vehicle batteries are oversized and may be batteries used in heavy equipment. It is unlikely that the hardened paint in the buckets in water based. Recent rainstorm events in the area have likely impacted the site.

The Rossi-type retort encased in gray asbestos-containing insolation layer present at the site is historic and needs to be preserved as part of this time critical removal action.

The work will involve abating the hazards posed by the mercury contaminated soil and the containers of hazardous materials present at the mine site.

Site Description: The Martha Ann Mine is a former mercury mine. While the processing of mercury here started as early as 1890, most of the processing associated with existing features took place in the early to mid-1950s. The mine is found in the headwaters of Dutra Creek in the Santa Lucia Range of the Coast Ranges within the boundaries of the Ventana Wilderness. The Site is about 2.0 acres along an intermittent unnamed creek which is a tributary to Dutra Creek.

The Site is solely on land under the jurisdiction, custody and control of the U.S. Department of Agriculture, Forest Service, within the Los Padres National Forest, Monterey Ranger District, Monterey County, California. Site elevation is approximately 2620 feet ASL (above sea level). It is located about 0.75 miles east of the Mount Mars summit.

Mercury deposits at the site were originally discovered in approximately 1875, but were not actively mined until 1890. Development of the mineral deposit consisted of a 100-foot adit and a 40-foot drift. Historical records indicate that both features were reported collapsed as of 1908. In 1941, the Martha Ann Mine is referred to as the Dutra Mine, and was considered part of the San Carporforo Mining District. The mine was described as consisting of two caved adits, with one open cut. In 1959, the mine was observed as having a 75-foot adit, but caved within 20 feet of the portal. Additional bulldozer hillside cuts and a hillside pit were also observed as prospect activity remnants. No mining activity after 1959 is reported. Features at the site include a small wooden building, the former retort and collection pipe, twenty five 55 gallon drums at the site that contain hydrocarbon fuel (likely degraded gasoline) or cyanide; 20 old vehicle batteries and the 10 paint buckets full of hardened paint.. A collapsed adit and waste rock pile were also present. A drain pipe is present below the collapsed adit in a gully leading to the creek.

Solicitation: 1291S8-18-R-0001 Attachment #2

Extent of Contamination: Mercury was detected at varying depths (2 to 8 inches) in the soil in the following locations: the flat area behind the retort; around the retort; near the collapsed adit; in the flat area between the building and the stream; near the discharge pipe. The estimated amount of mercury contaminated soil that requires excavation and disposal is 160 cubic yards.

The table below shows the concentration of mercury in the soil ranging from 0.91 mg/kg to 19000 mg/kg. The site map attached to this SOW shows the location of the sample results included in the table.

Sample Location Laboratory Results (Mercury, mg/kg)

OM-1 --

OM-2 --

OM-3 --

OM-4 --

OM-5 2000

OM-6 19000

OM-7 7000

OM-8 800

OM-9 1200

OM-10 --

OM-11 --

Solicitation: 1291S8-18-R-0001 Attachment #2

OM-12 --

OM-13 --

OM-14 --

OM-15 --

OM-16 1200

OM-17 1200

OM-18 810

OM-19 --

OM-20 --

OM-21 --

OM-22 --

OM-23 --

OM-24 400

OM-25 --

OM-26 0.91

Three of the six drums were tested and found to contain degraded gasoline. The drum sample was analyzed for VOCs, TPH-cc, and CAM 17 metals. VOCs detected in the sample include 1,2,4-trimethylbenzene (310,000 ug/kg), 1,3,5-trimethylbenzene (95,000 ug/kg), naphthalene (180,000 ug/kg), and n-butylbenzene (160,000 ug/kg). TPH detected in the sample included gasoline range organics (650,000 mg/kg) and diesel range organics (310,000 mg/kg) were also detected in the sample. None of the CAM 17 metals were detected in the drum sample.

The remaining three drums (2 labeled cyanide and one labeled sulfuric acid) were not tested.

Access: The Martha Ann Mine Mill Site is reached by taking California State Highway 1 north about 15 miles from San Simeon, California. Near Ragged Point Inn and Resort, a gated Forest Service road follows a steep, winding route to the top of the ridge connecting Bald Top on the south with Mount Mars on the north (Fig. 1). Proceed north along the top of the ridge to where the road intersects Forest road 24S06 just south of the Mount Mars summit area. The mine access road descends steeply to the east into the headwaters of Dutra Creek and the mine.

While 4-wheel drive vehicles are not required to reach the point nearest the site, high-ground clearance vehicles like a pickup truck are recommended. There is a one-hour plus downhill hike for about 1 mile to reach the site on a severely eroded road.

Location: The Martha Ann Mine Mill Site is adjacent to an unnamed tributary between 1,000 to 1,200 feet upstream from where it joins Dutra Creek. Features present include a small building, a single Rossi-type retort, and various flats, mounds, and excavations associated with extracting ore and disposing of processing waste. It appeared that a collapsed adit was present at the upslope side the flat above the retort. This and other flats present all appear to be due to excavation work rather than natural erosional or depositional processes. A cut or excavation extends from northeast of the small building to the tributary creek and near the creek has standing water with vegetation indicative of permanent water ponding. Water is discharged from a pipe extending from this ponded area into the tributary. The mill is located at N 35.81025o, W121.32444o within the SE1/4 Section 28, Township 24 South, Range 6 East (Mount Diablo Baseline and Meridian).

Removal Action Scope and Objectives: The scope of this time-critical removal action is the abatement of human and ecological exposure to mercury contaminated soil and hazardous materials.

Work at the site includes removal of six 55 gallon drums at the site that contain hydrocarbon fuel (likely degraded gasoline), cyanide and sulfuric acid; 10 old vehicle batteries and the 10 paint buckets full of hardened paint and mercury impacted soil; 8 flasks of mercury. Some of the hazardous materials (3 drums of fuel and 4 paint buckets) are stored outside, while the remaining

Solicitation: 1291S8-18-R-0001 Attachment #2 hazardous materials (2 drums of cyanide, 1 drum of sulfuric acid, 10 vehicle batteries, 6 paint buckets, 8 flasks of mercury and 3 deteriorated bags of ammonium nitrate ) are stored in the building located next to the retort. Non-mechanized methods must be used to remove the drums, drum contents, batteries, paint buckets, flasks of mercury and the contaminated soil from the site. Areas where soil has been removed must be restored to prevent erosion.

To achieve the removal action scope and objectives the mercury levels found in the contaminated soil must be reduced to 310 mg/kg and all of the hazardous materials currently stored on site must be removed and properly disposed.

The goal for this time-critical removal action is to address the immediate threat posed by “high levels of hazardous substances or pollutants or contaminants in soils largely at or near the surface, that may migrate;” as defined under section 300.415(b) (2) (iv) of the National Contingency Plan (NCP) as well as the threats posed by the chemicals located on the site. This goal would adequately address the actual and/or potential threats to humans and the environment due to the level of mercury and hazardous material present at the site.

The scope and goal for this removal action result in the following objective: Abating the human and ecological exposure to contaminated soil and hazardous materials.

Proposed Work:

The proposed work involves implementation of a Time Critical Removal Action. All work shall be performed in accordance with the National Contingency Plan the attached RFP. Work at the site includes:

Excavation, removal and off-site disposal of hazardous materials and contaminated soil.

Decontamination of the on-site retort that has been determined to be historic and requires preservation.

Site restoration and erosion control measures.

Work for this scenario includes, but is not limited to:

Development of Site Specific Time Critical Removal Action Work Plan that includes:

- A Construction management plan;

- A Sampling and analysis plan preparation for construction confirmation and

QA/QC;

- QAPP, HSP, and FSP in accordance with applicable CERCLA guidance;

- A Site Management Plan (SMP) that provides the Forest Service with a written understanding of how access, security, contingency procedures, management responsibilities and field generated waste disposal are to be handled.

Implementing the Site-specific removal action.

- Secure site and establish operations area, including laying out of clean zone, waste/stage handling areas and decontamination areas.

- Implementation of the proposed work.

- Maintain field logs and daily diaries.

- Monitor, update, and report construction progress.

Oversight of subcontractors performing site work.

- Conduct/attend progress meetings.

- Check construction drawings submitted by construction subcontractors for compliance with design and construction plans and specifications.

Performing field testing, recommending action on health and safety considerations (e.g., site safety plan), monitor quality control procedures

Quality Assurance Monitoring

Solicitation: 1291S8-18-R-0001 Attachment #2

Preparation of construction certification report. Figures and maps delineating areas of contamination shall be prepared in a GIS format so that boundaries may be placed on land status maps as appropriate.

Preparation of the After Action Report in accordance with NCP.

Site Scenario Deliverables. For this scenario, please submit the following:

Technical and price proposal.

Conceptual Time Critical Removal Action work plan that the firm has prepared (can be a plan from another site).

Example Time Critical Work Plan that the firm has prepared.

Example After Action Report that the firm has prepared.