(1) A Phase II
Report shall be submitted to the Department at the conclusion of Comprehensive
Site Assessment activities pursuant to the applicable deadlines set forth in
310
CMR 40.0550 or
40.0560 or at Interim
Deadlines specified by the Department.
(2) A Phase II Report shall present, contain,
or append relevant information, data, findings, and Opinions related to the
Comprehensive Site Assessment of the disposal site.
(3) A Phase II Report shall set forth in
narrative and, to the extent possible, in maps, graphs, and tables, the
disposal site Conceptual Site Model, approach, methods and results of the Phase
II - Comprehensive Site Assessment.
(4) The information and assessment findings
outlined in 310 CMR 40.0835(4) shall be provided in the Phase II Report.
Depending upon specific site and release conditions, it may be necessary to
provide additional information to adequately characterize the disposal site,
consistent with the Response Action Performance Standard described in
310
CMR 40.0191, or it may be appropriate to
forgo particular assessment or information gathering elements and provide
Technical Justification as described in
310
CMR 40.0193.
(a) Disposal Site Name, Location and Locus
Map, updated, if necessary, from what was provided in the Phase I
Report;
(b) Detailed Disposal Site
Map(s), updated, as necessary, from the base map(s) provided in the Phase I
Report, and depicting all investigatory and sampling points relevant to the
Comprehensive Site Assessment, the boundaries of the disposal site in plan
view, and, as appropriate, the vertical extent of contamination at the disposal
site;
(c) Disposal Site History,
updated, supplemented, or modified if necessary from information provided in
the Phase I Report;
(d) Site
Hydrogeological Characteristics, including details of subsurface investigations
conducted at the disposal site, together with a comprehensive description and
depiction of site hydrogeologic conditions, including, without limitation:
1. a description of all relevant geologic,
hydrologic, geophysical, and other subsurface investigations and assessments
conducted at the disposal site;
2.
documentation related to borings, well construction, and well development,
including copies of well drilling logs, within or appended to the Phase II
Report; and
3. a detailed
characterization of geologic and hydrogeologic conditions at the disposal site,
including:
a. groundwater potentiometric
surface(s), gradients, flow rates, and flow direction(s);
b. soil type(s), stratigraphy, and
permeability;
c. where appropriate,
bedrock type and characteristics, depths and contours; and
d. an evaluation and description of the
potential for flooding;
(e)
Environmental Fate and
Transport of Oil and/or Hazardous Material, including, as
appropriate:
1. an evaluation of the
environmental fate and transport characteristics of the oil and/or hazardous
material identified at the disposal site, including, without limitation,
mobility, stability, volatility, persistence and bioaccumulative potential of
the oil and/or hazardous material;
2. identification and characterization of
existing and potential migration pathways of the oil and/or hazardous material
at and from the disposal site, including, as appropriate, air, soil,
groundwater, soil gas, preferential migration pathways such as subsurface
utility lines and other subsurface void spaces, surface water, sediment, and
food chain pathways; and
3. an
evaluation of the potential for soil, groundwater, or NAPL to be a source of
vapors of oil and/or hazardous material to indoor air of occupied structures as
described in
310
CMR 40.0900;
(f) Nature and Extent of Contamination,
including a characterization of the nature, and vertical and horizontal extent
of oil and/or hazardous material in the environment, including any and all
source(s), the presence, distribution, and stability of any NAPL, tabulation of
analytical testing results, and, where appropriate, a characterization of
background concentrations of oil and/or hazardous material at the disposal
site;
(g) Exposure Assessment,
including the identification and characterization of all potential human and
environmental receptors that could be impacted by oil and/or hazardous material
at or migrating from the disposal site, and, as appropriate, the quantification
of exposure of oil and/or hazardous material to these receptors, including
justification for the sampling approach and the Exposure Point Concentration
calculation, under current and reasonably foreseeable site conditions, as
described in
310
CMR 40.0900;
(h) Risk Characterization, as set forth in
310
CMR 40.0900, for all appropriate human and
environmental receptors identified at and near the disposal site; and
(i) Conclusions, including a summary of the
Phase II Comprehensive Site Assessment findings. The Conclusions section shall
provide the disposal site Conceptual Site Model, the reasoning and results used
to support the findings, and indicate and support the outcome of the Phase II
Investigation as described in
310
CMR 40.0840.
