4. Evaluation of wetland functions, values,
and impacts. All applicants must describe those functions and values provided
and maintained by the subject freshwater wetlands, buffers, floodplains, areas
subject to flooding and areas subject to storm flowage; describe and assess any
anticipated impacts to their functions and values; and describe all structural
or non-structural best management practices, best available technologies,
schedules, and management plans which will be employed to avoid, or minimize
impacts to freshwater wetlands, buffers, floodplains, areas subject to flooding
and areas subject to storm flowage to the maximum extent possible. This written
evaluation must clearly and fully explain how the proposed project complies
with all applicable review criteria set forth or referred to in § 9.7.2 of
this Part and must describe the evaluation methodology, the qualifications of
persons involved in the evaluation, and must describe all jurisdictional area.
a. Evaluation methodology: Identify the
scientific techniques and methods which were used to complete the evaluation,
including the dates and times of observations and field studies and the result
of such observations and field studies. Identify each specific evaluation
methodology that was used, and identify, describe, and explain any deviation
from the methodology, and any assumptions made with a specific methodology.
Identify and describe any limitation placed upon the study or evaluation which
could affect the outcome of the results.
b. Qualifications: List the names and
qualifications of each person involved in the evaluation. Assessment of
functions and values and impacts may require input by more than one (1)
qualified professional consultant or more than one (1) individual familiar with
the specific functions or values of the freshwater wetlands, buffers,
floodplains, areas subject to flooding and areas subject to storm flowage. The
names, addresses and backgrounds of any individuals consulted for the
evaluation must be submitted as well as a description of the extent of their
participation.
c. Jurisdictional
area: Describe all jurisdictional area on-site as well as any off-site
freshwater wetlands that are hydrologically connected to the on-site wetland(s)
and identify all freshwater wetlands, buffers, floodplains, areas subject to
flooding and areas subject to storm flowage evaluated, including any areas of
potential impact associated with the project within the jurisdictional
area.
d. In addition to the
evaluation elements required above, the applicant must address the following
requirements in the written evaluation:
(1)
Wildlife and wildlife habitat
(AA)
Characteristics. Provide the size of the freshwater wetland(s), and describe
the topography, microtopography (i.e., leaf litter, mound and pool, exposed
soil, rocks), soils, hydrology, dominant plant communities and vegetation in
each stratum (i.e., tree, shrub, and herbaceous layers) of the freshwater
wetland and buffer or, if a pond, vernal pool or watercourse, the dominant
aquatic vegetation; identify and describe any standing or flowing water bodies,
water quality, nearby land uses within one hundred fifty feet (150') of the
edge of the subject freshwater wetlands and buffer; and identify other
freshwater wetland(s) which are hydrologically connected to the on-site
freshwater wetland(s) with distances between freshwater wetlands
provided;
(BB) Wildlife indicators.
Detail and describe the indications of wildlife use (e.g., direct observation
of wildlife or indicators such as burrows, scat, tree cavities, tracks, trails,
nests, scrapes, and any other observable signs or vocalizations). Detail those
species known to be present or that can be anticipated to use the habitat that
is present. Note the presence of wildlife habitat which is likely to be used by
game or non-game species;
(CC)
Values. Identify and describe the current and potential ability of the
freshwater wetlands and buffers to provide or maintain the functions and values
relating to wildlife and wildlife habitat; and
(DD) Proposed impacts. Identify and describe
the physical, chemical and biological impacts, both short-term and long-term,
to the wildlife habitat associated with the freshwater wetlands and buffers
resulting from the project which include, but are not limited to: impacts to
travel, nesting, feeding, spawning, resting, nursery or brood rearing, escape
cover, seasonal breeding, migration, and over-wintering for resident, seasonal
or transient species; impacts to any rare species; impacts to any game or
non-game species managed by State or Federal fish and game agencies; impacts to
wildlife habitat functions and values due to changes associated with lighting,
noise, temperature, water quality, air quality, water velocity, flow patterns,
water elevations, water temperature, fragmentation of habitat, predator/prey
relationships, composition of plant or animal communities, intrusion of exotic
or invasive species; whether the project may result in displacement, reduction
or extirpation of any wildlife species; and whether the project will result in
any cumulative loss of wildlife habitat, wildlife species or wildlife
populations.
(2)
Recreation and aesthetics
(AA)
Characteristics. Provide the size of the freshwater wetland(s), and describe
topography, soils, hydrology, dominant plant communities and vegetation in each
stratum (i.e., tree, shrub, and herbaceous layers) of the freshwater wetlands
and buffers, or if a pond, vernal pool or watercourse, the dominant aquatic
vegetation; identify and describe any standing or flowing water bodies, water
quality, nearby land uses within one hundred fifty feet (150') from the edge of
the subject freshwater wetland(s) and buffers, and identify other freshwater
wetland(s) which are hydrologically connected to the on-site freshwater
wetland(s) with distances between freshwater wetlands provided. Also, identify
and describe the location of the freshwater wetlands and buffers and the
availability of public access and viewing sites;
(BB) Values. Identify and describe the
current and potential ability of the freshwater wetlands and buffers to provide
or maintain the functions and values as defined herein relating to recreation
and aesthetics; and
(CC) Proposed
Impacts. Describe the probable individual and cumulative impacts of the project
on the recreational and aesthetic values and any potential reduction in the
current or potential ability of the freshwater wetlands and buffers to provide
aesthetic values and active or passive recreational activities to the public.
Consider the impacts to: wildlife habitat; rare species; vegetation and plant
communities; water quality; water temperature, water velocity, water volume and
water elevation; wildlife which can be fished, hunted, trapped, observed,
heard, studied, or photographed; open space value; public access and public's
view of the freshwater wetland; the freshwater wetland's or buffer's prominence
as a distinct feature in the local area; the use and enjoyment of watercourses
or water bodies within, adjacent to, or nearby the project; and the freshwater
wetland's functions and values as a rare freshwater wetland type.
(3) Flood protection
(AA) Drainage characteristics. Identify and
describe the drainage characteristics of the site of the project, including any
areas contributing stormwater runoff to freshwater wetlands or buffers;
describe the drainage characteristics of any surface water flows, including any
flowing bodies of water or areas subject to storm flowage within the project
site, or within any freshwater wetlands on or off-site that may be impacted by
the project; and identify and describe the extent of flooding up to and
including a one hundred (100) year frequency storm flood event. Include a map
which delineates the watershed of:
(i) The
site of the project;
(ii) Any
freshwater wetlands or buffers receiving water from the site of the project;
and
(iii) Any off-site freshwater
wetlands or buffers which may be impacted by the project.
(BB) Values. Identify and describe the
functions and values of the freshwater wetlands, buffers, floodplains, areas
subject to flooding and areas subject to storm flowage relating to their
ability to temporarily store or meter out flood waters from storm events, and
to accommodate surface water and drainage into, out of, between, through or
within the jurisdictional area under preproject conditions.
(CC) Analysis of proposed impacts
(i) Projects proposing changes in run-off
towards freshwater wetlands and buffers shall submit a stormwater analysis for
pre- and post-project runoff rates based upon the one (1) year, ten (10) year,
and one hundred (100) year, twenty-four (24) hour, Type III storm events. The
analysis must be performed using methodologies specified in the most recent
version of the Stormwater Management, Design, and Installation Rules,
250-RICR-150- 10-8. In the event that the stormwater analysis reveals any
increase above pre-project runoff rates, or any increase in peak flood
elevations within receiving waters/wetlands, identify and describe the impact
such proposed increase may have upon all functions and values as defined
herein. Describe the anticipated impacts to the freshwater wetlands and buffers
using supporting calculations, data, diagrams, graphs, and
observations.
(ii) Projects
proposing changes in drainage characteristics of freshwater wetlands, buffers,
floodplains, areas subject to flooding and areas subject to storm flowage or
affecting their ability to store, meter out, or reduce the impacts of flooding
and flood flows: Identify and describe all project components that may decrease
the of freshwater wetlands, buffers, floodplains, areas subject to flooding and
areas subject to storm flowage ability to meter out flood waters or decrease
their ability to maintain surface flows and natural drainage characteristics.
Such project components include, but are not limited to: changes in topography
from filling or excavation; changes in vegetative characteristics; additions of
buildings or structures; and piping, culverting, bridging, excavating,
channelization, relocation, filling, damming or diking. Identify and describe
the impacts the project may have upon all freshwater wetland functions and
values. Describe the anticipated impacts of all projects using supporting
calculations, data, diagrams, figures, graphs or observations as appropriate.
Such impact evaluation must be supported by a flood flow analysis based upon
the one (1) year, ten (10) year, and one hundred (100) year, twenty-four (24)
hour, Type III storm event for pre- and post-project conditions.
(DD) Compensation for
loss of flood storage. Projects which propose filling or placement of
structures in a flood plain or area subject to flooding may provide
compensatory flood storage in order to comply with the review criteria as set
forth in § 9.7.2 of this Part by excavation or by permanently eliminating
structures which currently displace flood waters; however, compensatory storage
may not be proposed beneath or within the confines of any building or
structures. Where applicable, compensatory flood storage must be proposed in
accordance with the following requirements:
(i) The volume of compensatory flood storage
must be equal to or greater than the volume of floodwaters displaced by the
project on a foot-by-foot elevation basis unless otherwise specified by the
CRMC;
(ii) The compensation area
must have an unrestricted hydraulic connection to the affected floodplain and
provide the same rate of flood storage capture and discharge over the course of
the flood event as in pre-project conditions;
(iii) Compensatory storage must be located
within the same reach of the river or flowing body of water (i.e., between the
nearest features controlling the flood water elevations upstream and downstream
from the proposed displacement area) as the project involving flood water
displacement, and must be located as close to the proposed displacement area as
possible;
(iv) Creation of
compensatory storage must precede or occur simultaneously with the construction
of any portion of the project which displaces flood waters;
(v) Where the applicant proposes a
compensatory storage area on property owned by others, the applicant must
submit a written agreement between such landowner and the applicant wherein the
landowner agrees to convey an easement or other property interest or right to
the applicant allowing compensatory storage, and to permanently maintain such
area for flood storage purposes in the event that the CRMC approves the
applicant's project; and
(vi) The
design must include all features and best management practices to ensure that
impacts to the functions and values of other freshwater wetlands and buffers
have been mitigated.
(4) Groundwater and surface water supplies
(AA) Hydrologic characteristics. Identify and
describe the current hydrologic characteristics, including both surface and
groundwater flows, within and to any freshwater wetlands or buffers that may be
affected by the project. Identify the pre-project elevation range of the
surface or groundwater on a seasonal and annual basis in the freshwater
wetlands and buffers and in the vicinity of the proposed alteration. Describe
the extent to which the surface or groundwater levels deviate from long-term
ranges and averages. Include a map delineating the watershed of:
(i) The site of the project;
(ii) Any freshwater wetlands and buffers
receiving water from such site; and
(iii) Any off-site freshwater wetlands and
buffers which may be impacted by the project.
(BB) Functions and values. Identify and
describe the functions and values of the freshwater wetlands and buffers
relating to surface water or groundwater supplies.
(CC) Proposed impacts. Identify and describe
all components and activities of the project that may directly or indirectly
divert, reduce or contain surface or groundwater flow to, away from, or within
any freshwater wetlands and buffers, including a description of the volumes of
water which may be diverted, reduced or contained, and the rate and duration of
such diversion, reduction or containment. Identify and describe the impacts the
project may have upon all functions and values. Describe the anticipated
impacts using supporting calculations, data, figures, diagrams, graphs and
observations as appropriate.
(5) Water quality
(AA) Drainage characteristics. Identify and
describe the current drainage characteristics of the area of the project,
including any on or off-site freshwater wetlands that may be impacted by the
project.
(BB) Functions and values.
Identify and describe the functions and values of the freshwater wetlands and
buffers relating to water quality; and describe the present water quality
classification and impairment status of any water body as set forth by the
Rhode Island Department of Environmental Management. Include a description of
the water quality conditions of all freshwater wetlands within the project
area, as well as any off-site freshwater wetlands that may be affected by the
project. Identify how the project will avoid contributing to a violation of the
standards or contributing to any further degradation of currently degraded
surface or groundwater resources.
(CC) Water quality analysis
(i) When required, submit a pollutant loading
analysis that quantifies the pollutants in stormwater runoff for both pre- and
post-project conditions using the methodology specified in the most recent
edition of Stormwater Management, Design and Installation Rules, 250-RICR-
150-10-8. If the methods used incorporate the best available technology, but
are different from those in the manual or deviate from its guidelines, the
applicant must describe why they were used and submit and document all data,
calculations, and methods used. The acceptance of these alternative methods is
subject to CRMC approval; and
(ii)
Submit a water quality analysis that quantifies the pollutant concentrations or
loadings from land uses with higher potential pollutant loads (LUHPPLs) as
specified in Stormwater Management, Design and Installation Rules, 250-RICR-
150-10-8, as well as plant nurseries or other land uses involving use of
fertilizers, herbicides, pesticides for both pre- and postproject conditions by
using one (1) or more acceptable and scientifically supported methodologies.
The acceptance of the method(s) utilized for such calculations is subject to
CRMC approval.
(DD)
Proposed Impacts. Identify and describe all components and activities of the
proposed project that may result in any degradation of water quality associated
with freshwater wetlands by increasing pollutant sources; nutrient loading;
increasing turbidity; decreasing oxygen; altering temperature regimes; reducing
stream or river flows; altering the freshwater wetland's or buffer's ability to
retain or remove nutrients; or by withdrawing water from or near any freshwater
wetlands. Identify and describe the impacts the proposed project may have upon
all functions and values. Describe the anticipated impacts to the freshwater
wetlands and buffers using supporting calculations, data, figures, diagrams,
graphs and observations.
(6) Soil erosion and sediment control
(AA) Identify and describe all proposed land
disturbance activities; current site conditions, including soil conditions and
topography; drainage characteristics of the site of the proposed project; any
critical erosion areas; and all proposed non-structural and structural
temporary and permanent erosion and sediment control methods. Further, describe
how and why such erosion and sediment control measures will protect functions
and values and meet the review criteria as set forth in § 9.17.2 of this
Part. The written evaluation must include supporting calculations, data,
figures, diagrams, graphs and observations. For projects involving one (1) acre
or more of land disturbance, this requirement must be satisfied with the
submittal of a Soil Erosion and Sediment Control Plan as specified in the DEM's
General Permit for Storm Water Discharge Associated with Construction Activity,
250-RICR- 150-10-1.
e. Conclusion: Identify and detail how the
project meets all review criteria as set forth in § 9.7.2. Describe any
measures to reduce impacts which were considered and rejected and indicate why
they cannot or should not be employed.
f. Literature citations: Provide citations
for all literature used to support the evaluation.