Statement of Work For Remedial Investigation (RI) and Feasibility
Molycorp, Inc., Site
This Statement of Work (SOW) sets forth requirements of the Administrative
Order on Consent (the "Order") for implementation of work, including the
development of a remedial investigation and feasibility study (RI/FS).
The purpose of the RI/FS is to investigate the nature and extent of contamination
at the Molycorp, Inc., Site (the "Site"), and develop and evaluate potential
remedial alternatives. The RI and FS are interactive and may be conducted
concurrently so that the data collected in the RI influences the development
of remedial alternatives in the FS, which in turn affects the data needs
and the scope of treatability studies.
Molycorp will conduct the RI/FS (except for the human health baseline
risk assessment (HHRA) and the ecological risk assessment (ERA) components,
jointly "the risk assessments," as noted in Paragraph 23
of this document) and produce a draft RI and FS report that are in accordance
with the Order, including this SOW, the Guidance for Conducting Remedial
Investigations and Feasibility Studies Under CERCLA (the "RI/FS Guidance"),
the Guide to Preparing Superfund Proposed Plans, Records of Decision,
and Other Remedy Selection Decision Documents (the "ROD Guidance"),
and any other guidance documents that EPA uses in conducting an RI/FS
(a list of the primary guidance documents is attached), as well as any
additional requirements in the Order.(1)
The RI/FS Guidance describes the report format and the required report
content. (In this SOW, numbers in parentheses at the head of a section
or paragraph refer to a specific part of the RI/FS Guidance.) Molycorp
will furnish all necessary personnel, materials, and services needed,
or incidental to, performing the RI/FS, except as otherwise specified
in the Order.
At the completion of the RI/FS, EPA will be responsible for the selection
of a Site remedy and will document this selection in a Record of Decision
(ROD). The remedial action alternative selected by EPA will meet the cleanup
standards specified in CERCLA Section 121. That is, the selected remedial
action will be protective of human health and the environment, will be
in compliance with, or include a waiver of, applicable or relevant and
appropriate requirements of other laws, will be cost-effective, will utilize
permanent solutions and alternative treatment technologies or resource
recovery technologies to the maximum extent practicable, and will address
the statutory preference for treatment as a principal element. The final
RI/FS report and EPA's risk assessments will, with the administrative
record, form the basis for the selection of the Site remedy and will provide
the information necessary to support the development of the ROD.
As specified in CERCLA Section 104(a)(1), as amended by SARA, EPA will
provide oversight of Molycorp's activities throughout the RI/FS. Molycorp
will support EPA's initiation and conduct of activities related to the
implementation of oversight activities.
WORK TO BE PERFORMED
I. Scoping (RI/FS Guidance, Chapter 2)
- Within 180 days of the effective date of this order,
Molycorp will submit for EPA review the following written documents,
which are more fully described below in SOW Paragraphs 9-15:
- Conceptual Site model
- List of preliminary remedial action alternatives
- RI/FS Work Plan (including Schedule for the RI/FS activities and
- Preliminary list of ARARs and TBCs
- Sampling and Analysis Plan (which will be coordinated with EPA
to meet the needs of the risk assessments)
- Candidate Technologies Report for Treatability Studies (which
may include treatability studies already in progress)
- Site Health and Safety Plan
Molycorp's Project Coordinator will meet with EPA after submittal of
the written documents listed above to brief EPA regarding the findings
that Molycorp made during the first phases of scoping (as defined in
Chapter 2 of the RI/FS Guidance). EPA will notify Molycorp in writing
of the proposed date of the meeting, to be mutually agreed upon. During
Site Characterization (SOW Section III) EPA may require Molycorp to
conduct additional scoping activities, if the results of field screening
or laboratory analyses show that Site conditions are significantly different
than EPA originally believed them to be at the end of the first phase
of scoping. EPA will notify Molycorp in writing whenever EPA decides
that Molycorp will perform additional scoping, and Molycorp will perform
the additional scoping as notified by EPA. Within 30 days of EPA's notification
to Molycorp regarding additional scoping, Molycorp will develop and
submit, for EPA review and approval, a written work plan for the additional
scoping that EPA requires Molycorp to perform. Molycorp will then perform
the additional scoping according to the EPA-approved work plan and the
EPA-approved schedules in the work plan.
The RI/FS Work Plan and Sampling and Analysis Plan will be reviewed
and approved by EPA before the initiation of field activities. EPA will,
if requested by Molycorp, review and comment on work plans for upcoming
or ongoing field activities conducted under state authorities, to assist
Molycorp in gathering data which will be of sufficient quality to be
useful in the Remedial Investigation detailed in this SOW. Molycorp
may also submit written requests to EPA to perform RI field activities
before EPA approval of the entire RI/FS Work Plan. EPA may approve or
deny the request.
- Planning meeting (2.2.1). Molycorp's Project Coordinator
will meet with EPA representatives and EPA-authorized parties (State
officials and representatives of Federal resource management agencies
will be invited to attend) in the early part of Scoping. EPA will notify
Molycorp in writing of the proposed date of the meeting, to be mutually
agreed upon. At the meeting, Molycorp's Project Coordinator, EPA representatives,
and other invited parties will meet and discuss Site issues including
the identification of preliminary remedial action objectives, preliminary
identification of ARARs expected to apply to Site characterization and
Site remediation activities, and develop ideas for refinement of the
conceptual Site model.
- Collect and analyze existing data (2.2.2). Molycorp
will compile and review all existing Site data. In compiling the data,
Molycorp will exhaust all of the data collection information sources
in Table 2-1 (Data Collection Information Sources) of the RI/FS Guidance.
Molycorp will compile all existing information regarding the following:
- Sources of contaminants, migration pathways, and potential human
and environmental receptors; including a review of all historical
and current potential sources (natural and man-made) of ground water
- Varieties and quantities of contaminants released at or near the
- Past disposal practices of any kind at and near the Site including
a comprehensive study of historic tailings spills;
- The physical and chemical characteristics of the contaminants,
and their distribution among the environmental media (ground water,
soil, surface water, sediments, and air) at and near the Site;
- Any previous sampling events conducted at or near the Site;
- Previous responses conducted at or near the Site by local, state,
federal, or private parties, known by Molycorp;
- Geology, hydrogeology, local and regional hydrology, and meteorology
of the Site;
- Environmental characterization of the Site, including flora and
fauna at and near the Site; data regarding threatened, endangered,
or rare species; and sensitive environmental areas and critical
habitats at and near the Site (Molycorp will compile any results
from relevant previous testing to document any known ecological
effect such as toxicity or bioaccumulation in the food chain.);
- Background ground water, soil, surface water, sediments, and air
- Demographics and land use at and near the Site;
- Residential, municipal, agricultural, or industrial wells at or
near the Site; and
- Surface water uses for areas surrounding the Site, including downstream
of the Site.
Molycorp will use data compiled and reviewed to describe additional
data needed to characterize the Site, to better define potential ARARs,
and to develop a range of preliminarily identified remedial alternatives.
All data compiled will be supplied to EPA in ArcView®
format or other electronic format as approved by the RPM. All GIS
data sets will be in a UTM or State Plane coordinate system. EPA recognizes
that, historically, survey data at the Molycorp Mine Site in Questa
have been generated in the mine coordinate system. Conversion of these
data to the State Plane coordinate system may result in errors in
the x, y, and z directions. The RI/FS Work Plan will include a data
management plan as specified in Paragraph 13 of
this SOW. Molycorp will establish DQOs, subject to EPA approval, for
evaluating the usefulness of existing data.
- Develop a conceptual Site model (188.8.131.52). Molycorp
will use existing data to develop a conceptual Site model, as described
in the RI/FS Guidance at Section 184.108.40.206 and Figure 2-2. This model
Further detail in the site conceptual model will be refined by EPA with
input from the Technical Coordination Group (TCG) in the risk assessments
(Step 3 of the Ecological Risk Assessment.)
- known and suspected sources of contaminants,(2)
and all affected media (ground water, soil, surface water, sediments,
- known and potential routes of migration of contaminants, and
all affected media (ground water, soil, surface water, sediments,
and air); and
- known and potential human and environmental receptors(3)
- Develop preliminary remedial action alternatives
(2.2.3). Based upon the remedial action objectives for each
contaminated medium, which EPA will establish after Molycorp has had
an opportunity to comment on EPA's proposed remedial action objectives
and based upon the initially identified potential routes of contaminant
exposure and associated receptors, Molycorp will develop a preliminary
list of remedial action alternatives and associated technologies for
each medium. This preliminary list should not be a detailed investigation
of alternatives, but instead a general classification of potential remedial
action alternatives and technologies. Molycorp will include in the list
alternatives in which treatment significantly reducing the toxicity,
mobility, or volume of waste is a principal element; one or more alternatives
that involve containment with little or no treatment; and a no-action
- Implement limited additional studies (220.127.116.11). If
EPA determines, based on Molycorp's submissions or other communications,
that Molycorp's conceptual understanding of the Site is incomplete,
and that collection of new Site-specific data would greatly enhance
the scoping effort (in particular, the development of the conceptual
Site model), EPA may require Molycorp to undertake a limited field investigation
on and near the Site before approval of the RI/FS work plan.
If EPA notifies Molycorp that a limited field investigation
is required, Molycorp will develop a limited field investigation work
plan, including a schedule, for EPA's approval. Upon notification by
EPA that the work plan is approved, Molycorp will perform the limited
field investigation. Examples of tasks that Molycorp will perform if
required by the work plan include: preliminary geophysical investigations;
residential, industrial, and agricultural well sampling and analysis;
measurements of well-water level; sampling of pre-existing monitoring
wells, and sample analysis; limited sampling to describe the need for
hazardous material treatability studies; air monitoring; Site mapping;
and preliminary ecological reconnaissance.
- Develop preliminary list of ARARs and to be considered information
(2.2.5). Molycorp will conduct a preliminary identification
of potential state and federal ARARs (chemical-specific, location-specific
and action-specific) and to be considered (TBC) advisories, criteria
or guidance, as defined in 40 C.F.R. § 300.400(g), to assist in the
refinement of remedial action objectives and the initial identification
of remedial alternatives and ARARs associated with particular actions.
Molycorp will evaluate the New Mexico Mining Act and the New Mexico
Water Quality Act, and regulations promulgated under them, as potential
ARARs. ARAR and TBC identification will continue as Site conditions,
contaminants, background conditions and remedial action alternatives
are better defined.
- Identify data needs. Molycorp will evaluate the need
for additional Site data relative to meeting the remedial action objectives
established by EPA , in accordance with Paragraph 5
of this SOW. Molycorp will evaluate existing data to determine whether
more data will be obtained to define source areas of hazardous material
contamination, to define the potential pathways of hazardous materials
migration, and to identify any potential human or environmental hazardous
materials receptors to the extent necessary to: (i) enable the risk
assessments to show whether or to what extent a threat to human health
or the environment exists; and (ii) develop and evaluate remedial action
alternatives (including the no-action alternative). If EPA or Molycorp
determines that additional data are needed, Molycorp will: (i) propose
DQOs for the needed data consistent with "Guidance for the Data Quality
Objectives Process," EPA/600/R96/055, QA/G4, August 2000; and (ii) propose
priorities to be assigned to the types of data which needs to be gathered
based on the remedial action objectives.
- Candidate Technologies for Treatability
Studies (5.2; 5.4). If remedial actions involving
treatment have been identified by Molycorp or EPA, treatability studies
will be required unless Molycorp can demonstrate to EPA's satisfaction
that they are not needed or that they have already been conducted. Where
treatability studies are needed, initial treatability testing activities
(such as research and study design) will be planned to occur concurrently
with Site Characterization (SOW Section III) activities. Molycorp will
develop and submit to EPA a technical memorandum identifying candidate
technologies for a treatability studies program and those studies currently
underway. The listing of candidate technologies will cover the range
of technologies required for detailed analysis of alternatives(SOW Section
VI). Molycorp has committed to and is conducting the following treatability
studies under state authorities:
- revegetation test plots for the tailings
- borrow materials studies (mine and tailings)
- mine site surface erosion and stability analysis
- Sampling and Analysis Plan (2.3.2). Molycorp will
develop and submit, for EPA review and approval, a written sampling
and analysis plan (SAP), which includes sampling and analysis necessary
for EPA to perform the risk assessments. Molycorp will prepare the portion
of the sampling and analysis plan that involves sampling for nature
and extent of contamination. EPA will scope the risk assessments, as
detailed in Paragraph 23, and will give input to
Molycorp in preparing the portion of the SAP that involve sampling in
support of the risk assessment. In writing the SAP, Molycorp will follow
the format described in Table 2-4 (Suggested Format for SAP (FSP and
QAPP)) of the RI/FS Guidance. Molycorp will design the SAP in a manner
that ensures that sample collection and analytical activities are conducted
in accordance with technically acceptable protocols, as determined by
EPA, and that the data meet DQOs. At a minimum the SAP must include
analyses for TAL metals and molybdenum. The SAP provides a mechanism
for planning field activities and will include a field sampling plan
(FSP) and a quality assurance project plan (QAPP). The FSP will define
in detail the sampling and data-gathering methods that will be used
on the project. It will include sampling objectives, sample location
and frequency, sampling equipment and procedures, and sample handling
and analysis. The QAPP will describe the project objectives and organization,
functional activities, and quality assurance and quality control (QA/QC)
protocols that will be used to achieve the desired DQOs. The QAPP will
follow EPA Requirements for Quality Assurance Project Plans, QA/R-5,
March 2001. The DQOs developed by Molycorp will at a minimum reflect
use of analytic methods for identifying and remediating contamination
consistent with the levels for remedial action objectives identified
at 40 C.F.R. § 300.430(e)(2)(i). In addition, the QAPP will address
sampling procedures, sample custody, analytical procedures, and data
reduction, validation, reporting and personnel qualifications, including
the following measures:
- Field personnel will be made available for EPA QA/QC training
and orientation at EPA's request.
- Molycorp will demonstrate, in advance and to EPA's satisfaction,
that each laboratory it may use is qualified to conduct the proposed
- All laboratories used will use methods and analytical protocols
for the analytes in the media of interest within detection and
quantification limits consistent with EPA QA/QC procedures and
with DQOs approved in the QAPP for the Site by EPA.
- All laboratories used will have and follow an approved QA program.
- If a laboratory not in the Contract Laboratory Program (CLP)
is selected, methods consistent with CLP methods that would be
used at this Site for the purposes proposed and QA/QC procedures
approved by EPA will be used. In addition, a laboratory QA program
will be submitted for EPA review and approval, and the laboratory's
EPA proficiency tests for waste water and drinking water for at
least the previous two years will be submitted to EPA.
- EPA may require that Molycorp submit detailed information to
demonstrate that any laboratory used is qualified to conduct the
work, including information on personnel qualifications, equipment
and material specifications.
- Any laboratory used for work under the Order is subject to EPA
disapproval in accordance with Paragraph 34 of the Order. If,
at any time, EPA determines that any laboratory used by Molycorp
is unacceptable for any reason, Molycorp, will at EPA's request
bar that laboratory from any work under the Order, and notify
EPA of Molycorp's selected new laboratory.
- Molycorp will provide EPA with unlimited access to laboratory
personnel, equipment and records relating to sample collection,
transportation and analysis.
- RI/FS Work Plan (2.3.1). Molycorp will develop and
submit, for EPA review and approval, an RI/FS Work Plan documenting
the decisions and evaluations completed during the scoping process.
This plan will include a comprehensive description of the work to be
performed, including the methodologies to be utilized, as well as plans
and schedules for Molycorp's completion of the work described in SOW
Sections III through VI (Site Characterization, Treatability Studies,
Development and Screening of Alternatives, and Detailed Analysis of
Alternatives). As EPA approves portions of the work plan, Molycorp will
perform the work described in those EPA-approved portions according
to the plans and schedules in the EPA-approved portions of the RI/FS
Work Plan, subject to Section XXII of the AOC (Force Majeure).
- The work plan will include the rationale for performing the required
activities. Specifically, the work plan will present a statement of
the problem(s) and potential problem(s) posed by the Site and the objectives
of the RI/FS. Further, the plan will include a Site background summary
setting forth the Site description including the geographic location
of the Site, and a description of the past (including pre-mining) and
present background conditions and current Site physiography, hydrology,
geology, demographics, ecological, cultural and natural resource features;
a synopsis of the Site history and a description of previous responses
that have been conducted at the Site by local, state, federal, or private
parties; a summary of the existing data in terms of physical and chemical
characteristics of the contaminants identified, and their distribution
among the environmental media at the Site. In addition, the plan will
include a description of the Site management strategy developed during
scoping, and a preliminary identification of remedial alternatives and
data needs for evaluation of remedial alternatives. The plan will reflect
coordination with treatability study requirements (see Sections I and
IV) and the USGS Background Study which is currently being conducted
under State authorities.(4) It will include
a process for and manner of identifying Federal and State ARARs (chemical-specific,
location-specific and action-specific).
- The work plan will include a detailed description
of the work to be performed under each section of this SOW, information
needed for each task and for EPA's risk assessments (in accordance with
Paragraph 23 of this SOW), information to be produced
during and at the conclusion of the work required by each section, and
a description of the work products that will be submitted to EPA. These
products include the deliverables set forth in the remainder of this
statement of work; a schedule for each of the required activities that
is consistent with the RI/FS guidance; and a project management plan,
including a data management plan (e.g., requirements for project management
systems and software, minimum data requirements, data format, public
access to data, and backup data management), monthly reports to EPA
and meetings and presentations to EPA at the conclusion of each major
phase of the RI/FS. Appendix B of the RI/FS Guidance contains a comprehensive
description of the required contents of the work plan. Additional data
requirements and analyses may be identified throughout the process.
Whenever such requirements are identified, Molycorp will submit a technical
memorandum documenting the need for additional data, and identifying
the DQOs. In any event, Molycorp is responsible for fulfilling additional
data and analysis needs identified by EPA consistent with the general
scope and objectives of this RI/FS.
- Upon approval of the RI/FS Work Plan by EPA, Molycorp will complete
the work described in the RI/FS Work Plan, including the development
of an RI/FS, according to the EPA-approved plans and schedules in the
RI/FS Work Plan. In view of the unknown Site conditions, activities
are often iterative, and to satisfy the objectives of the RI/FS, EPA
may require Molycorp to supplement the work specified in the initial
RI/FS Work Plan if, using the DQO process and standard statistical methods,
data gaps are identified which indicate the need for acquisition of
- Site Health and Safety Plan (2.3.3). Molycorp
will prepare a health and safety plan in conformity with Molycorp's
health and safety program, and in compliance with applicable OSHA and
EPA requirements. The health and safety plan will include the 11 elements
described in the RI/FS Guidance, including a health and safety risk
analysis, a description of monitoring and personnel protective equipment,
medical monitoring, and Site control. EPA does not approve or disapprove
the health and safety plan, but does review it to ensure that all necessary
elements are included, and that it provides for the protection of human
health and the environment. This plan will be prepared in accordance
with all applicable EPA guidance, and will comply with all applicable
Occupational Safety and Health Administration (OSHA) regulations. Molycorp
will incorporate all appropriate changes to the plan recommended by
EPA. This paragraph is limited to work conducted pursuant to the AOC
and this SOW. It does not apply to Molycorp employees engaged in, or
activities related to, routine business operations or other environmental
permits or programs.
II. Community Relations
- The development and implementation of community relations activities,
including conducting community interviews and developing a community
relations plan, are the responsibility of EPA. Molycorp will assist
EPA as needed by providing information regarding the Site's history,
participating in public meetings, or by preparing fact sheets for distribution
to the general public. EPA and Molycorp will notify each other in advance
of community meetings that they schedule regarding environmental issues
at the Site.
- Before the public comment period on the proposed plan begins, EPA
will place a copy of the Administrative Record in a community information
repository that EPA has established near the Site. The community information
repository is located in the Village of Questa Buildings, 2500 Old State
Road 3, P.O. Box 260, Questa, New Mexico 87556; phone 505.586.0694.
In addition to the Administrative Record, EPA may at any time place
documents in the information repository for public review. Molycorp
will on request provide EPA one additional copy of Site documents for
III. Site Characterization (RI/FS Guidance, Chapter 3)
Site characterization consists of identifying the sources of contamination
and defining the nature, extent, and volume of the sources of contamination,
including their physical and chemical constituents as well as their
concentrations in comparison to background concentrations in the affected
media. In addition, it includes an investigation of the extent of
migration of contamination as well as its volume and any changes in
its physical or chemical characteristics, to provide for a comprehensive
understanding of the nature and extent of contamination at the Site.
Using this information, contaminant fate and transport is then determined
Site characterization also includes determining past (including pre-mining)
and present background concentrations of analytes in all environmental
media, including, but not limited to, ground water, surface water,
sediment, seeps and springs, soil, and native rock. Factors affecting
background may include regional geology, hydrogeology, and hydrology.
Background concentrations of analytes will be compared to Site concentrations
of contaminants before EPA makes risk management decisions.
- During this phase of the RI/FS, the work plan, SAP, and health and
safety plan are implemented. Field data are collected and analyzed to
provide the information required to accomplish the objectives of the
study. At least two weeks before any field work pursuant to the RI/FS
begins, Molycorp will notify EPA of the planned dates for field activities,
including environmental characterization, field layout of the sampling
grid, excavation, installation of wells, initiating sampling, installation
and calibration of equipment, pump tests, and initiation of analysis
and other field investigation activities.
- Site characterization consists of four major components: (1) field
investigations; (2) laboratory analyses of field samples; (3) data analysis,
including the risk assessments; and (4) data management. EPA will perform
the risk assessments, as detailed in Paragraph 23
of this SOW; Molycorp will perform the other components, as detailed
in this SOW. Molycorp's field methods, sampling procedures, and chain
of custody records will be consistent with EPA's "A Compendium of Superfund
Field Operations Methods," August 1987, OSWER Directive No. 9355.0-14
("the Compendium") or equivalent more recent guidance.
- Field Investigation (3.2). The field investigation
includes the gathering of data to define Site physical characteristics,
sources of contamination, and the nature and extent of contamination
at the Site, in accordance with the work plan and SAP. At a minimum,
this investigation will address the following:
- Implement field support activities (3.2.1).
Molycorp will begin field support activities upon approval of
the work plan and SAP. Field support activities may include obtaining
access to the Site; scheduling; and procuring equipment, office
space, laboratory services, or contractors. Molycorp will notify
EPA in writing upon completion of field support activities.
- Investigate Site physical characteristics (3.2.2). Molycorp
will collect data on the physical characteristics of the Site
and its surrounding areas, in order to define potential transport
pathways and human and ecological receptor populations. Molycorp
will obtain engineering data (such as pumping characteristics)
for the projection of contaminant fate and transport, and development
and screening of remedial action alternatives, including information
to assess treatment technologies. The investigation will include
collection of data on the following features at and near the Site,
as required by the RI/FS Guidance (section 3.2.2):
- Surface features;
- Soils and the vadose zone;
- Surface water hydrology;
- Human populations and land use; and
Define sources of contamination (3.2.3). Molycorp
will collect data describing the location and type of existing
containment for all known sources of contamination on or near
the Site. The physical characteristics and chemical constituents
and their concentrations will be determined for all known and
discovered sources of contamination. Molycorp will conduct sufficient
sampling to define the boundaries of the contaminant sources
to the level established in the QA/QC plan and DQOs. Molycorp
will consider all potential sources (including natural and man-made
sources) of contamination on and near the Site, including drums,
tanks, surface impoundments, tailings or waste rock piles, landfills,
hydrothermal scars, and media (ground water, soil, surface water,
sediments, and air), and will collect data regarding the following:
- Site characteristics that help to identify the location
of the source of the contamination;
- source characteristics, including the types and quantities
of contaminants that may be contained in the source or released
to the environment; and
- the physical or chemical characteristics of contaminants
present in the source.
Molycorp will collect the information described in the first
column of Table 3-10 (Summary of Source Information) of the
RI/FS Guidance using the primary and secondary collection methods
described in the third and fourth columns of that table, as
appropriate. If requested by EPA, Molycorp will collect data
regarding the location and extent of contaminant sources using
methodologies described in Section 8 of the Compendium. EPA
may require Molycorp to collect data using survey techniques
including ground-penetrating radar, electrical resistivity,
electromagnetic induction, magnetometry, seismic profiling,
and aerial photography (using infrared imagery to find sources
through interpretation of the ecological effects that result
from stressed biota).
Describe the nature and extent of contamination (3.2.4).
As a final step during the field investigation, Molycorp will
gather information to describe the nature and extent of contamination
at and near the Site. Molycorp will use information gathered
regarding Site physical characteristics and sources of contamination
to give a preliminary estimate of the contaminants that may
have migrated. Molycorp will then implement an iterative monitoring
program and any study program identified in the work plan or
SAP, such that by using analytical techniques sufficient to
detect and quantify the concentration of contaminants, the migration
of contaminants through the various media at the Site can be
determined. In addition, Molycorp will gather data for calculations
of contaminant fate and transport. This process will continue
until the area and depth of contamination are known to the level
of contamination established in the QA/QC plan and DQOs.
In the iterative process, Molycorp will initially take a round
of samples on and near the Site using field screening type techniques,
if necessary. The sampling program will be based on EPA's preliminary
work on the risk assessments, including the problem formulation
step of the ecological risk assessment, and will include ground
water, soil, surface water, sediment, and air samples, and biological
samples in support of the ERA. Based on the results of the initial
samples, EPA will work with Molycorp, using the DQO process
and standard statistical methods, to evaluate the necessity
of taking additional rounds of ground water, soil, surface water,
sediments, air, and/or biological samples. EPA will then determine
the adequacy of the number and types of samples after consultation
with Molycorp. If appropriate, as determined by EPA's evaluation,
Molycorp will analyze subsequent sampling rounds using more
exacting techniques as specified by EPA. As the final step in
this iterative sampling and analysis process, Molycorp will
document the extent of contamination on and near the Site using
an analytical level specified by EPA that yields data quality
that is sufficient, as determined by EPA, for use in the risk
assessments and in the analysis and selection of remedial alternatives.
Molycorp will use the methodologies for sampling in each medium
required by the RI/FS Guidance (section 3.2.4).
- Additional Site characterization. EPA and Molycorp
will review data collected and evaluated as part of the initial
RI Site investigation, and they will compare that data to the
data needs identified for conducting the detailed analysis of
remedial alternatives for the Site during the DQO process. If
existing data are determined to be insufficient by EPA or Molycorp,
Molycorp will collect and analyze additional Site data in order
to meet data needs for conducting the detailed analysis of alternatives.
Before additional Site data is collected and analyzed, Molycorp
will review the QAPP and the FSP and propose modifications to
EPA as appropriate to guide the collection of additional Site
- Data Analysis (3.4). As further described below,
Molycorp will develop or refine the conceptual Site model by analyzing
data on physical characteristics of the Site and the area near the Site,
Site contaminant source characteristics, the nature and extent of contamination
on and near the Site, and contaminant fate and transport.
Site physical characteristics. Molycorp will
analyze and evaluate the data on Site physical characteristics
to describe the environmental setting at the Site, including important
surface features, soils, geology, hydrology, meteorology, and
ecology. Molycorp's analysis of Site physical characteristics
will emphasize factors important in determining contaminant fate
and transport for all pathways by which contaminants may migrate.
- Source characteristics. Molycorp will analyze
data on Site contaminant source characteristics, including the source
location; the type and integrity of any existing waste containment;
and the types, quantities, chemical properties, physical properties,
and concentrations of contaminants found on and near the Site. Molycorp
will evaluate the actual and potential magnitude of releases from
each source, and the mobility and persistence of source contaminants.
- Nature and extent of contamination. Molycorp
will analyze data on the nature and extent of contamination at and
near the Site in all environmental media. This analysis will include
the horizontal and vertical extent of contamination in soil, ground
water, surface water, sediment, air, biota, and man-made structures,
as well as spatial and temporal trends in contamination.
- Contaminant fate and transport. Molycorp will
analyze Site contaminant fate and transport, utilizing and combining
the results of the Site physical characteristics, source characteristics,
and extent of contamination analyses. The analysis will include
estimates of the rate of contaminant migration in the transport
pathway. If appropriate, as approved by EPA, Molycorp may use analytical
or numerical modeling to analyze contaminant fate and transport.
Molycorp will identify any proposed models to EPA in a technical
memorandum before their use. Molycorp's analysis of contaminant
fate and transport will be consistent with EPA's "Superfund Exposure
Assessment Manual" (April 1988)
All data and programming, including any proprietary programs, will
be made available to EPA together with a sensitivity analysis. Molycorp
may assert a business confidentiality claim for the proprietary programs,
as provided in Section XVI of the Order. The RI data will be presented
in ArcView® format or other electronic format as directed
by the RPM, and in accordance with the data management plan to facilitate
EPA's preparation of the risk assessments. All GIS data sets will
be in a UTM or State Plane coordinate system. EPA recognizes that,
historically, survey data at the Molycorp Mine Site in Questa have
been generated in the mine coordinate system. Conversion of these
data to the State Plane coordinate system may result in errors in
the x, y, and z directions. Analyses of data collected for Site characterization
will meet the DQOs developed in the QA/QC plan stated in the SAP (or
as revised during the RI).
- Risk assessments. The risk assessments
will be developed through a Technical Coordination Group (TCG) process.
The TCG will include technical specialists from EPA and Molycorp who
will meet and/or participate in conference calls regularly to coordinate
risk assessment activities and discuss specifics of the risk assessment
implementation. EPA will direct the scoping and problem formulation
for the baseline human health risk assessment and the ecological risk
assessment for the Site, and the preparation of the written risk assessment
reports. Molycorp will give input into the process through the TCG and
will collect any data needed to fill gaps or perform the risk assessments.
Data needs for the risk assessments will be evaluated by EPA and Molycorp
using the DQO process and statistical methods. A comparison of total
risk to background risk will be performed by EPA before making the risk
management decisions for the Site. The risk assessments will be conducted
according to current EPA guidance, including the documents listed in
the reference section of this SOW.
- Data Management Procedures (3.5). Molycorp will consistently
document the quality and validity of field and laboratory data compiled
during the RI. All data compiled will be electronically supplied to
EPA in ArcView® format or other electronic format as
directed by the RPM in accordance with the data management plan. All
GIS data sets will be in a UTM or State Plane coordinate system. EPA
recognizes that, historically, survey data at the Molycorp Mine Site
in Questa have been generated in the mine coordinate system. Conversion
of these data to the State Plane coordinate system may result in errors
in the x, y, and z directions.
- Document field activities (3.5.1). During Site
characterization and sampling, Molycorp will follow consistent documentation
and accurate record keeping procedures, and will follow the following
data management procedures:
- Quality Assurance/Quality Control (QA/QC) Plans.
Molycorp will develop written Quality Assurance/Quality Control
(QA/QC) plans, and submit them for EPA review and approval.
Molycorp will follow the EPA-approved QA/QC plans during Site
characterization sampling and analysis.
- Data security system. Molycorp will develop
and submit, for EPA review and approval, a written plan describing
the data security system for the RI. This system will describe
measures that Molycorp will take in the field to safeguard chain-of-custody
records and to prevent free access to project records. Molycorp
will follow the procedures in the EPA-approved data security
system during the time that the Order is in effect.
- Field logs. Molycorp will produce written
daily field log books as the primary record for Molycorp's field
investigation activities. These log books will contain all field
measurements and observations as directly recorded in the field,
and entries regarding:
- all field measurements, including pH, temperature, conductivity,
water flow, air quality parameters, and soil characteristics;
- health and safety monitoring performed by Molycorp pursuant
to the health and safety plan;
- written entries describing sampling locations, sampling
techniques, and a general description of Molycorp's daily
- Any unusual occurrences or circumstances.
Molycorp will record data directly and legibly in field log
books with entries signed and dated by Molycorp or Molycorp's
contractors. Original written field log book entries may not
be obscured when Molycorp makes changes in written log book
entries, and Molycorp or Molycorp's agent will sign and date
any changes. Molycorp will use standard format information
sheets for Molycorp's written daily log entries.
- Maintain sample management and tracking (3.5.2, 3.5.3).
Molycorp will maintain field reports, sample shipment records,
analytical results, and QA/QC reports to ensure that only validated
analytical data are reported and utilized in the development and
evaluation of remedial alternatives. Analytical results developed
under the work plan may not be included in any Site characterization
reports unless accompanied by or cross-referenced to the corresponding
- Preliminary Site Characterization Summary (3.7.2). Within
90 days of receipt of the last sample results from the initial field
sampling and analysis, Molycorp will prepare and submit for EPA review
and approval a Preliminary Site Characterization Summary. Molycorp's
Project Coordinator will meet with EPA before submission of the Preliminary
Site Characterization Summary to brief EPA regarding the findings that
Molycorp has made. Molycorp will notify EPA in writing of the proposed
date of the meeting, to be mutually agreed upon. In the Preliminary
Site Characterization Summary, Molycorp will briefly review the results
of initial field sampling and analysis, and describe and display Site
data documenting the location and characteristics of surface and subsurface
features and contamination at the Site including the affected medium,
location, types, physical state, concentration of contaminants and quantity.
In addition, the location, dimensions, physical condition and varying
concentrations of each contaminant throughout each source and the extent
of contaminant migration through each of the affected media will be
documented. The Preliminary Site Characterization Summary will provide
EPA with enough information to give EPA a preliminary reference for
developing the risk assessments, for evaluating Molycorp's development
and screening of remedial alternatives, and for evaluating Molycorp's
refinement and identification of ARARs. It will also provide the Agency
for Toxic Substances and Disease Registry (ATSDR) with data (before
the issuance of the Draft RI Report) to assist with their health assessment
efforts. If EPA or Molycorp identify remedial actions involving treatment
as remedial alternatives for the Site, Molycorp will, in the Preliminary
Site Characterization Summary, provide EPA with the specific data requirements
for treatability studies for those identified alternatives. The effort
to prepare the Site Characterization will be conducted as part of the
Remedial Investigation Report activities. Site characterization sections
of the Draft RI report will be excerpted and provided as the Preliminary
Site Characterization Summary. If additional data are collected after
the Preliminary Site Characterization Summary is submitted, the draft
RI Report will be modified to discuss the additional data.
- Remedial Investigation (RI) Report (3.7.3). After
EPA's completion of the risk assessments, Molycorp will prepare and
submit a draft Remedial Investigation (RI) report to EPA for review
and approval. The RI Report will summarize results of field activities
to characterize the Site, sources of contamination, nature and extent
of contamination and the fate and transport of contaminants. Molycorp
will follow the RI Report format described in Table 3-13 of the RI/FS
Guidance. EPA will supply the risk assessments, which may be included
as appendices to the RI Report instead of chapters as the guidance suggests.
IV. Treatability Studies (RI/FS Guidance, Chapter
- Treatability testing will be performed by Molycorp to assist in the
detailed analysis of alternatives (SOW Section VI). In addition, if
applicable, testing results and operating conditions will be used in
the detailed design of the selected remedial technology.
- Literature Survey Report (5.2). If appropriate, as
determined by EPA, Molycorp will conduct a literature survey to gather
information on performance, relative costs, applicability, removal efficiencies,
operation and maintenance (O&M) requirements, and implementability
of candidate technologies. If a literature survey is conducted, Molycorp
will develop and submit for EPA review and approval a Literature Survey
Report describing the survey and its results.
- Treatability Studies Work Plan (5.5). If EPA determines
that candidate technologies cannot be adequately evaluated for the Site
on the basis of available information, EPA will notify Molycorp that
treatability studies for candidate technologies are required.
Molycorp will then develop and submit to EPA for EPA review
and approval a written Treatability Studies Work Plan describing the
work needed and providing schedules for its completion. In the Treatability
Studies Work Plan, Molycorp will:
- describe the data that will be gathered to conduct treatability
studies of candidate technologies;
- describe the type of treatability test which Molycorp will use
to test each of the candidate technologies (i.e., bench versus pilot);
- describe various aspects of the treatability studies including
the Site background, candidate remedial technologies to be tested,
test objectives, experimental procedures, treatability conditions
to be tested, measurements of performance, analytical methods, data
management and analysis, health and safety, and residual waste management;
- document the DQOs for treatability testing;
- (if pilot-scale treatability testing is to be performed) describe
pilot plant installation and start-up, pilot plant operation and
maintenance procedures, operating conditions to be tested, a sampling
plan to determine pilot plant performance, and a detailed health
and safety plan for the pilot;
- (if testing is to be performed off-Site) describe permitting requirements
and the manner in which Molycorp will meet permitting requirements;
- submit schedules for Molycorp's completion of the treatability
studies work. Molycorp will perform the work described in the EPA-approved
Treatability Studies Work Plan according to the schedules in it.
- Treatability study SAP (5.5). If the QAPP or FSP
prepared by Molycorp in accordance with SOW Paragraph 10
(Sampling and Analysis Plan) is not adequate for defining the activities
to be performed during any required treatability studies, Molycorp will
develop and submit for EPA review and approval a separate treatability
study SAP. Molycorp will ensure that, in preparing the treatability
study SAP, it meets the requirements of SOW Paragraph 10.
- Treatability study health and safety plan (5.5). If
the health and safety plan prepared by Molycorp in accordance with SOW
Paragraph 15 (Site Health and Safety Plan) is not
adequate for defining the activities to be performed during implementation
of any required treatability study, Molycorp will develop and submit
for EPA review a separate treatability study health and safety plan.
EPA does not "approve" the treatability study health
and safety plan. Molycorp will ensure that, in preparing the treatability
study health and safety plan, it meets the requirements of SOW Paragraph
- Treatability Studies Evaluation Report (5.6). After
completion of the treatability studies, Molycorp will develop and submit
for EPA review and approval a Treatability Studies Evaluation Report
analyzing and interpreting the testing results. Depending on the sequence
of activities, this report may be a part of the RI/FS report or a separate
deliverable. The report will evaluate each candidate technology's effectiveness,
implementability, cost, and actual results as compared with predicted
results. The report will also evaluate full-scale application of the
candidate technologies, including a sensitivity analysis identifying
the key parameters affecting full-scale operation.
- Ongoing Action: The following actions are being taken by Molycorp
under state authorities and federal programs other than the Superfund
- Installation of shallow groundwater wells, extraction of groundwater
from new and existing EW series wells, and discharges to NPDES Outfall
- Upgrade of the seepage collection system in the tailings area
- Installation of seepage/groundwater interceptor system to recover
seepage water from three locations along the Red River
- Upgrade of the Capulin Canyon leachate collection system
- Upgrade of the mine site stormwater collection system
As provided in Paragraph 8 of the Order, on request by Molycorp EPA may
review these actions to determine whether they are consistent with the
NCP and the RI/FS Guidance. (EPA has not yet reviewed these actions for
that purpose.) Molycorp will submit one copy of each engineering design
document and drawing for these activities to the EPA RPM. If these documents
and drawings will be used in the RI/FS Report, they must be presented
in a format that is in accordance with the data management plan.
V. Development and Screening of Remedial Alternatives (RI/FS Guidance,
- The purpose of the development and screening of remedial alternatives
is to develop an appropriate range of remedial options for evaluation
in the detailed analysis of alternatives (SOW Section VI). Concurrent
with Site characterization (SOW Section III), Molycorp will begin to
develop and evaluate a range of appropriate remedial options that ensure
protection of human health and the environment. This range of alternatives
should include options in which treatment is used to reduce the toxicity,
mobility, or volume of wastes, but varying in the types of treatment,
the amount treated, and the manner in which long-term residuals or untreated
wastes are managed; options involving containment with little or no
treatment; options involving both treatment and containment; and a no-action
- Molycorp will perform the following activities
in the development and screening of remedial alternatives:
- Refine and document remedial action objectives (4.2.1).
Based on the risk assessments, Molycorp will review the
preliminary remedial action objectives established for the Site
by EPA. Molycorp will then propose to EPA refinements of the preliminary
remedial action objectives based on the information gathered during
Molycorp's investigations of the Site during Site Characterization
(SOW Section III). Molycorp's proposed remedial action objectives
will specify the contaminants and media of concern, potential exposure
pathways and receptors, and preliminary remediation goals ("PRGs";
acceptable contaminant concentration level or range of levels for
each exposure pathway). Molycorp's proposed PRGs will be protective
of human health and the environment, and will be developed in accordance
with 40 C.F.R. §§ 300.430(e)(2)(i)(A) through (G).
- Develop general response actions (4.2.2). Molycorp
will develop general response actions for each medium of interest,
defining containment, treatment, excavation, pumping, or other actions,
singly or in combination, to satisfy the remedial action objectives.
- Identify areas or volumes of media (4.2.3). Molycorp
will identify areas or volumes of media to which general response
actions may apply, taking into account requirements for protectiveness
as identified in the remedial action objectives. The chemical and
physical characterization of the Site will also be taken into account.
- Identify, screen, and document remedial technologies (4.2.4;
4.2.5). Molycorp will identify and evaluate technologies,
including innovative technologies, applicable to each general response
action. General response actions will be refined to specify remedial
technology types. Technology process options for each of the technology
types will be identified either concurrent with the identification
of technology types, or after the screening of the considered technology
Technology Process options will be evaluated on the basis of effectiveness,
implementability, and cost factors to select and retain one or more
representative processes for each technology type. Molycorp will
summarize the technology types and process options and specify the
reasons for eliminating alternatives.
- Assemble and document alternatives (4.2.6). Molycorp
will assemble selected representative technologies into alternatives
for each affected medium or operable unit. Together, all of the
alternatives will represent a range of treatment and containment
combinations that will address either the Site or the operable unit
as a whole. Molycorp will summarize the assembled alternatives and
their related action-specific ARARs.
The reasons for eliminating alternatives during the preliminary
screening process will be specified.
- Refine alternatives. Molycorp will refine the
remedial alternatives to identify contaminant volume addressed by
the proposed process and sizing of critical unit operations as necessary.
Sufficient information will be collected for an adequate comparison
of alternatives. Molycorp will also modify PRGs for each chemical
in each medium as necessary to incorporate any new risk assessment
information in the risk assessments. Additionally, Molycorp will
update action-specific ARARs as remedial alternatives are refined.
- Conduct and document screening evaluation of each alternative
(4.3). Molycorp will conduct a final screening of alternatives
using the three criteria in 40 C.F.R. §§ 300.430(e)(7)(i) through
(iii). If necessary, this screening may be conducted to ensure that
only the alternatives with the most favorable composite evaluation
of all factors are retained for further analysis. As appropriate,
the screening will preserve the range of treatment and containment
alternatives that was initially developed, and will include options
that use treatment technologies and permanent solutions to the maximum
extent practicable. Molycorp will summarize the results and reasoning
employed in screening, arraying alternatives that remain after screening
and identifying the action-specific ARARs for those alternatives.
- Alternatives Development and Screening Deliverables (4.5).
Molycorp will prepare a technical memorandum summarizing
the work performed in and the results of SOW sub-Paragraphs 35(a)
through (g) above, including an alternatives array summary. This
technical memorandum will document the methods, rationale, and results
of the alternatives screening process and the ARARs identification
process. These will be modified by Molycorp if required by EPA to
assure identification of a complete and appropriate range of viable
alternatives to be considered in the detailed analysis. Molycorp,
EPA, State, and citizen representatives will meet, at a date to
be mutually agreed upon, before submission of the technical memorandum.
Molycorp may include actions being taken under state and federal
programs other than the Superfund program for consideration in the
detailed analysis of alternatives. Technical memoranda will be prepared
to document the development and evaluation of alternatives for each
area and will be submitted to EPA. The results of these analyses
and evaluation of alternatives for the tailings area will be incorporated
into the detailed analysis of alternatives and the Feasibility Study.
VI. Detailed Analysis of Remedial Alternatives (RI/FS
Guidance, Chapter 6)
- The detailed analysis will be conducted by Molycorp
to provide EPA with the information needed to allow for the selection
of a Site remedy. This analysis is the final phase in Molycorp's conduct
of the FS.
- Detailed Analysis of Alternatives (6.2). Molycorp
will conduct a detailed analysis of alternatives and submit for EPA
review and approval a Feasibility Study Report. This report will provide
a detailed analysis of the limited number of alternatives that passed
the screening stage. EPA and Molycorp will jointly determine which alternatives
will be included in the detailed analysis before Molycorp drafts the
FS Report.. This analysis will assess each of the individual alternatives
against the seven evaluation criteria described at 40 C.F.R. §§ 300.430(e)(9)(iii)(A)
through (G), and focus on the relative performance of each alternative
against each of the seven criteria. Molycorp will ensure that the analysis
reflects the scope and complexity of Site problems and alternatives
being evaluated, and that the analysis considers the relative significance
of the factors within each of the criteria at 40 C.F.R. §§ 300.430(e)(9)(iii)(A)
through (G). In the analysis, Molycorp will identify pertinent advisories,
criteria, or guidance documents.
- In developing the FS Report, Molycorp will follow the FS Report format
described in Table 6-5 of the RI/FS Guidance. Molycorp's FS Report will
include text covering all the topics listed in Table 6-5.
- EPA will identify and select the preferred alternative, and will apply
the criteria described at 40 C.F.R. §§ 300.430(e)(9)(iii)(H) and (I).
- After Molycorp addresses EPA's comments on the FS report to EPA's
satisfaction, the final FS report may be bound with the final RI report.
The following list, although not comprehensive, contains many of the
regulations and guidance documents that apply to the RI/FS process:
National Oil and Hazardous Substances Pollution Contingency Plan,
40 C.F.R. Part 300.
OSHA regulations at 29 C.F.R. 1910.120.
"Guidance for Conducting Remedial Investigations and Feasibility Studies
Under CERCLA," U.S. EPA, Office of Emergency and Remedial Response,
October 1988, OSWER Directive No. 9355.3-01.
"Guidance on Oversight of Potentially
Responsible Party Remedial Investigations and Feasibility
Studies," U.S. EPA, Office of Waste Programs Enforcement, OSWER Directive
"Interim Guidance on PRP Participation in the RI/FS Process," U.S.
EPA, May 16, 1988, OSWER Directive No. 9835.1a.
"Guide to Preparing Superfund Proposed Plans, Records of Decision,
and Other Remedy Selection Decision Documents," U.S. EPA, Office of
Solid Waste and Emergency Response, EPA 540-R-98-031, July 1999, OSWER
Directive No. 9200.1-23P.
"A Compendium of Superfund Field Operations Methods," Two Volumes,
U.S. EPA, Office of Emergency and Remedial Response, EPA/540/P-87/001a,
August 1987, OSWER Directive No. 9355.0-14.
"EPA NEIC Policies and Procedures Manual," May 1978, revised November
"Data Quality Objectives for Remedial Response Activities," U.S. EPA,
Office of Emergency and Remedial Response and Office of Waste Programs
Enforcement, EPA/540/G-87/003, March 1987, OSWER Directive No. 9335.0-7B.
"EPA Requirements for Quality Assurance Project Plans, Interim Final,"
EPA QA/R-5, November 1999.
"EPA Guidance for Quality Assurance Project Plans," EPA QA/G-5, February
"Users Guide to the EPA Contract Laboratory Programs," U.S. EPA, Sample
Management Office, August 1982.
"Interim Guidance on Compliance with Applicable or Relevant and Appropriate
Requirements," U.S. EPA, Office of Emergency and Remedial Response,
July 9, 1987, OSWER Directive No. 9234.0-05.
"CERCLA Compliance with Other Laws Manual," Two Volumes, U.S. EPA,
Office of Emergency and Remedial Response, August 1988 (draft), OSWER
Directive No. 9234.1-01 and -02.
"Guidance on Remedial Actions for Contaminated Ground Water at Superfund
Sites" (Interim Final), U.S. EPA, Office of Emergency and Remedial Response,
December 1, 1988, OSWER Directive No. 9283.1-2.
"Draft Guidance on Preparing Superfund Decision Documents," U.S. EPA,
Office of Emergency and Remedial Response, March 1988, OSWER Directive
"Risk Assessment Guidance for Superfund - Volume I Human Health Evaluation
Manual (Part A)," December 1989, EPA/540/1-89/002.
"Risk Assessment Guidance for Superfund - Volume I Human Health Evaluation
Manual (Part B) - Development of Risk-based Preliminary Remediation
"Risk Assessment Guidance for Superfund - Volume I Human Health Evaluation
Manual (Part D) - Standardized Planning, Reporting, and Review of Superfund
Risk Assessments," January 1998.
"Risk Assessment Guidance for Superfund. Volume I: Human Health Evaluation
Manual. Supplemental Guidance. Dermal Risk Assessment." Interim Guidance,
"Risk Assessment Guidance for Superfund - Volume II Environmental
Evaluation Manual," March 1989, EPA/540/1-89/001.
"Ecological Risk Assessment Guidance for Superfund: Process for Designing
and Conducting Ecological Risk Assessments" (Interim Final), U.S. EPA,
June 5, 1997.
"Guidance for Data Usability in Risk Assessment," Parts A and B, April
1, 1992, OSWER Directives 9285.7-09A and B.
"Performance of Risk Assessments in Remedial Investigation/Feasibility
Studies (RI/FSs) Conducted by Potentially Responsible Parties (PRPs),"
August 28, 1990, OSWER Directive No. 9835.15.
"Role of the Baseline Risk Assessment in Superfund Remedy Selection
Decisions," April 22, 1991, OSWER Directive No. 9355.0-30.
"Health and Safety Requirements of Employees Employed in Field Activities,"
U.S. EPA, Office of Emergency and Remedial Response, July 12, 1981,
EPA Order No. 1440.2.
"Final Guidance on Administrative Records for Selecting CERCLA Response
Actions," U.S. EPA, December 3, 1990, OSWER Directive No. 9833.3A-1.
"Community Relations in Superfund: A Handbook," U.S. EPA, Office of
Emergency and Remedial Response, June 1988, OSWER Directive No. 9230.0#3B.
"Community Relations During Enforcement Activities And Development
of the Administrative Record," U.S. EPA, Office of Programs Enforcement,
November 1988, OSWER Directive No. 9836.0-1A.
"Exposure Factors Handbook," EPA, 1997.
"Human Health Evaluation Manual, Supplemental Guidance, Standard Default
Exposure Factors," EPA , 1991.
"Dermal Exposure Assessment: Principles and Applications" (Interim
Report), U.S. EPA, Office of Health and Environmental Assessment, January,
Integrated Risk Information System (IRIS), 2000.
"Health Effects Assessment Summary Tables (HEAST)," U.S. EPA, Office
of Solid Waste and Emergency Response, 1997, EPA/540/R-95/036.
"Use of Soil Cleanup Criteria in 40 CFR Part 192 as Remediation Goals
for CERCLA sites," U.S. EPA, Office of Emergency and Remedial Response,
February 12, 1998, OSWER Directive No. 9200.4-25.
"Guidelines for Ecological Risk Assessment," U.S. EPA, April 1998,
EPA/630/R-95/0021 (Federal Register Vol. 63, No. 93, May 14, 1998).
1. If EPA approves a schedule under the Order, that
schedule supersedes any timing requirements established in guidance documents.
Likewise, if EPA, in accordance with the Order, requires Molycorp to perform
work at a time not consistent with guidance documents, Molycorp will nonetheless
perform the work.
2. As noted in the Definitions section of the Order,
as used herein the term "contaminant" includes hazardous substances and
pollutants. If any submission under this Order references any contaminant
or pollutant that is not also a hazardous substance, Molycorp will make
an explicit statement to that effect in the same submission.
3. The identification of environmental receptors
is a part of the ecological risk assessment problem formulation, and thus
will be coordinated with EPA.
4. A review committee, including representatives
from Molycorp, the citizen group Amigos Bravos, and the New Mexico Environment
Department, has been established for the USGS Study.