|
Significant or Potentially Significant
Impacts of CRDRP |
Mitigation Measures (parentheses
refer to sections from 1994 NLP EIR or 1998 SEIR) |
Is Mitigation a Permit Condition? |
Impact Level After Mitigation |
|
Geology |
|
|
|
|
G1. Erosion potential during construction. |
Implement approved Erosion Control Plan; obtain
1601 Stream Alteration Agreement from CDFG; carry out RWQCB Section
401 requirements (NLP 6.3.1-1) |
Yes, SWRCB Permit 20808 Conditions #20, 21,
23 and 45;
COE 404 Permit 20364S09 Special Condition
#2. |
LS |
|
HYDROLOGY |
|
|
|
|
H1. In drought years only, lack of flow to the
lagoon in certain months. [Project provides flow benefits in
most years.] |
Flow releases as required by SWRCB; year-round
flow to lagoon not possible in drought years due to lack of inflow
and release requirements for fish during winter and spring months.
(NLP 7.3.1-1; SEIR C.3.1-1) |
Yes, SWRCB Permit 20808, Condition #34 -37;
COE 404 Permit 20364S09 Special Condition
#3. |
SU in drought years only (<25% of time) |
|
H2. Potential reduction in channel capacity and
increased flood elevations downstream of dam. |
Carry out approved 20-year monitoring plan for
changes in channel capacity and riparian vegetation growth. If
adverse trend observed, implement agency-approved corrective
measures such as selective channel clearing and sediment removal.
(NLP 7.3.1-4) |
Yes, SWRCB Permit 20808, Condition #22 and
45;
COE 404 Permit 20364S09 Special Condition
#3. |
LS |
|
H3. Potential reduced sediment movement in mainstem
may lead to buildup at confluence with tributaries and degraded
fish habitat. |
Monitor sediment delivery for six major tributaries
for 20 years; if adverse trend observed, implement corrective
sediment management measures such as detention basins to trap
bedload. (NLP 7.3.1-6) |
Yes, SWRCB Permit 20808, Conditions #22, 33
and 45;
COE 404 Permit 20364S09 Special Condition
#3. |
LS |
|
H4. Changed streamflow pattern potentially could
increase sediment residence time and lead to streambank erosion. |
Monitor channel geometry and riparian growth
for 20 years; if significant potential for erosion in storms
is observed, implement corrective river works to reduce erosion
risk (NLP 7.3.1-7) |
Yes, SWRCB Permit 20808, Condition #22 and
45;
COE 404 Permit 20364S09 Special Condition
#3. |
LS |
|
H5. Potential sand transport into the lagoon
due to increased flow in dry years. |
Monitor lagoon volume and sediment transport
for 20 years; if significant potential for habitat degradation
is observed, implement corrective program to reduce sediment
deposition. (NLP 7.3.1-8) |
Yes, SWRCB Permit 20808, Condition #45 and
47;
COE 404 Permit 20364S09 Special Condition
#3. |
LS |
|
H6. Impoundment of water in new reservoir could
alter downstream water quality (esp. temperature and oxygen for
aquatic life). |
Design and construct multi-level intake structure
on outlet works that enables flexible operation to maximize releases
of cool, oxygenated water. (NLP 7.5.1-1) |
Yes, SWRCB Permit 20808, Condition #24 and
45;
COE 404 Permit 20364S09 Special Condition
#3. |
LS |
|
H7. Temporary adverse impacts to water quality
during dam construction. |
Implement RWQCB Section 401 Certification requirements,
including water treatment, erosion control, construction practices,
spill prevention plan vegetation buffer zones, water quality
monitoring, protection of domestic supplies for nearby water
users, agency coordination and special discharge permits prior
to construction. (NLP 7.6.1-1 as refined) |
Yes, SWRCB Permit 20808 Condition #23 and
45;
COE 404 Permit 20364S09 Special Conditions
#2 and 3. |
LS |
|
Fish and Aquatic Life |
|
|
|
|
F1. New reservoir inundates or blocks 12% of
steelhead spawning habitat. |
Restore existing degraded habitat downstream
of new dam by injection of spawning gravels as described in Spawning
Habitat Mitigation Plan. (NLP 8.3.1-1; SEIR D.4.1-1) |
Yes, SWRCB Permit 20808 Conditions #32, 33,
43 and 45;
COE 404 Permit 20364S09 Special Condition
#3. |
LS |
|
F2. New reservoir inundates or blocks 12-14%
of steelhead rearing habitat. |
Flow releases, substrate and woody debris management
as described in Steelhead Resource Mitigation Plan. (NLP 8.3.1-2;
SEIR D.4.1-2) |
Yes, SWRCB Permit 20808 Conditions #33-37,
43-45;
COE 404 Permit 20364S09 Special Condition
#3. |
LS |
|
F3. In severe drought periods (such as 1987-1991),
reduced opportunity for upstream migration as compared to natural
conditions. [CRDRP is beneficial compared to existing/No Project] |
Flow releases as feasible, without impacting
other portions of steelhead life cycle; operate emergency broodstock
program, if approved by agencies. Impact cannot be mitigated
with flow alone; if emergency broodstock facility not approved,
impact cannot be fully mitigated. (NLP 8.3.1-3; SEIR D.4.2-1) |
Yes, SWRCB Permit 20808 Conditions #33-37,
43-45;
COE 404 Permit 20364S09 Special Condition
#3. |
PSU in prolonged droughts
only
(<12% of time) |
|
F4. Project flows are beneficial for juvenile
rearing except potentially significant in late spring and early
summer between dams; potential impact of sediment buildup as
described in H3. |
Operate reservoir to ensure releases to maintain
fry downstream following emergence from nest; improve rearing
habitat between Narrows and San Clemente Dam. Maintain passage
of woody debris; manage sediment; rescue and rear fish in droughts.
(NLP 8.3.1-5; SEIR D.4.2-3) |
Yes, SWRCB Permit 20808 Conditions #33-37,
43-46;
COE 404 Permit 20364S09 Special Condition
#3. |
LS |
|
F5. Reduction in winter and spring peak flows
could change substrate conditions in three river reaches, and
potentially reduce the abundance and diversity of preferred insect
food sources for juvenile steelhead in those areas. |
Conduct monitoring and benthic surveys to estimate
species richness, species diversity and population densities
of benthic insects. If monitoring shows a decline in drifting
insects, implement a program to inject appropriately sized riverbed
material to increase bed mobility. (SEIR D.4.2-4) |
No. This information was developed after permits
were issued in 1995 as part of settlement of litigation on SWRCB
permit. |
LS |
|
F6. Compared to natural conditions, increased
risk of stranding fall and winter migrants. [Reduced risk compared
to existing/ No Project conditions.] |
Flow releases required by SWRCB; rescue migrants
when warranted by lack of flows, similar to existing program
(NLP 8.3.1-6; SEIR D.4.2-5) |
Yes, SWRCB Permit 20808 Conditions #33-38,
40, 43-46;
COE 404 Permit 20364S09 Special Condition
#3. |
LS |
|
F7. Increased risk of stranding emigrating smolts
in spring in certain critically dry years; risk duration would
be longer in certain drought years, though total years with risk
would be lower. |
Flow releases required by SWRCB; rescue smolts
when warranted by lack of flows, similar to existing program
(NLP 8.3.1-7; SEIR D.4.2-6) |
Yes, SWRCB Permit 20808 Conditions #33-37,
40, 43-46;
COE 404 Permit 20364S09 Special Condition
#3. |
LS |
|
F8. Compared to natural conditions (no human
structures), adverse effects to fish passage. [Improved fish
passage compared to existing conditions.] |
Design and construct facilities as approved by
resource agencies; add screens as needed; water releases to keep
San Clemente Reservoir full. (NLP 8.3.1-8; SEIR D.4.3.1-1) |
Yes, SWRCB Permit 20808 Conditions #33-37,
41-45;
COE 404 Permit 20364S09 Special Condition
#3. |
LS |
|
F9. Construction activities could damage fish
habitat due to sedimentation and impede fish passage. See also
H7. |
Construct migration facilities; operate sediment
traps; comply with RWQCB Section 401 Certification requirements;
have funding available for emergency action. (NLP 8.4.1-1 as
refined by permits) |
Yes, SWRCB Permit 20808 Conditions #21, 23,
43, and 45;
COE 404 Permit 20364S09 Special Conditions
#2 and 3. |
LS |
|
VEGETATION AND WILDLIFE |
|
|
|
|
VW1. Loss of 127 acres of mixed hardwood forest
and coast live oak woodland. |
Acquire rights to preserve adjacent forest and
woodland in a 3:1 ratio (at least 380 acres) as wildlife habitat.
( NLP 9.3.1-2) |
Yes, SWRCB Permit 20808 Conditions #25 and 45. |
LS |
|
VW2. Loss of 6.3 acres of valley oak woodland |
Implement Valley Oak Woodland Mitigation Plan
at 23-acre site described in NLP EIR. (NLP 9.3.1-3) |
Yes, SWRCB Permit 20808 Conditions #26 and 45. |
LS |
|
VW3. Loss of 37 acres of riparian habitat not
in COE jurisdiction |
Implement Riparian/Wetland Mitigation Plan approved
by COE. (SEIR E.4.1.1) |
Yes, SWRCB Permit 20808 Conditions #28 and
45;
COE 404 Permit 20364S09 Special Condition
#4. |
LS |
|
VW4. Loss of 2.6 of wetland and 55 acres of surface
waters within COE jurisdiction. |
Implement Riparian/Wetland Mitigation Plan approved
by COE; create new 266-acre reservoir. (SEIR E.4.1.1) |
Yes, SWRCB Permit 20808 Conditions #28 and
45;
COE 404 Permit 20364S09 Special Condition
#4. |
LS |
|
VW5. Loss of habitat and displacement of federally
threatened California red-legged frog. |
Implement all reasonable and prudent measures
identified in Conference Opinion issued by USFWS; Riparian/Wetland
Mitigation Plan design incorporates habitat creation for frogs.
(NLP 9.3.1-7b; SEIR E.3.1) |
Yes, SWRCB Permit 20808 Conditions #28 and
45;
COE 404 Permit 20364S09 Special Conditions
#3 and 5. |
LS |
|
VW6. Stress to riparian vegetation and wildlife
habitat in drought years due to reduced water table. [Beneficial
effects in most years.] |
Irrigation of affected vegetation in drought
years, similar to existing program; continue existing wildlife
monitoring program for agency review; implement corrective measures
if adverse trends are evident. (NLP 9.3.1-8) |
Yes, SWRCB Permit 20808 Conditions #30, 31 and
45. |
PSU |
|
Traffic |
|
|
|
|
T1. During construction period, increased traffic
levels on Highway 1 and Carmel Valley, Cachagua and Tassajara
Roads; potential damage to roadways from heavy vehicles. |
Develop (during final design) and implement Traffic/Transportation
Plan as part of comprehensive Construction Management Plan. Elements
include hiring coordinators, avoiding peak traffic periods, carpooling,
shuttle busses and vans, pilot vehicles, safety plan, inspections,
road damage repair and other elements. (NLP 10.3.1-1; SEIR 4.2.3-1
through 4.2.3-3) |
No |
SU |
|
Climate/Air Quality |
|
|
|
|
CA1. During construction period, increased regional
air pollutant emissions from vehicles and equipment, smoke from
burning, and fugitive dust. |
Develop (during final design) and implement Construction
Emission Management Plan as part of comprehensive Construction
Management Plan. Elements include trip reduction (see T1), vehicle
inspection and maintenance, reduced idling; alternative clearing
methods, timber harvest, onsite chipping, burn permits; dust
abatement officer, equipment cleaning, wet suppression techniques,
and other elements. (NLP 11.3.1-1 through 11.3.1-3; SEIR 5.2.2-1) |
No |
SU |
|
Noise |
|
|
|
|
N1. During construction period, noise levels
in the project vicinity would be increased due to construction
traffic and activities in the staging area. |
Develop (during final design) and implement Noise
Reduction Plan as part of comprehensive Construction Management
Plan. Elements include trip reduction (see T1), restrictions
on timing of activities, advisories to nearby residents, mufflers
and other sound control techniques, home retrofit program, and
other elements. (NLP 12.3.1-1; SEIR 6.2.2-1 and 6.2.2-2) |
No |
SU |
|
Visual Quality |
|
|
|
|
V1. Construction activities will alter existing
visual conditions in the project area and result in more nighttime
light; the new dam will permanently alter the viewshed in the
project vicinity. |
For construction impacts, develop (during final
design) and implement Visual Quality Plan as part of comprehensive
Construction Management Plan. Elements include focused lighting,
minimize nighttime work, vegetation buffer zone. Long-term efforts
include landscaping to shield public views, treatments to dam
face, and other elements. (NLP 13.3.1-1 and 13.3.1-2; SEIR 9.2.2-1and
9.2.2-2) |
No |
SU |
|
Cultural Resources |
|
|
|
|
CR1. Loss, damage or disturbance of Esselen cultural
properties (archaeological sites) in project area (NHPA Criterion
D: potential to contribute information) |
Implement Programmatic Agreement pursuant to
NHPA Section 106; develop umbrella Historic Property Management
Plan for sites in this class, and individual treatment plans
for each eligible site to be approved by PA signatories. SEIR
recommends focus on research design, data recovery, evaluation;
avoid and minimize construction impacts as feasible (SEIR 7.2.3-1
through 7.2.3-3). |
Yes, SWRCB Permit 20808 Conditions #45-53;
COE 404 Permit 20364S09 Special Condition
#1.
Specific measures finalized via Section 106
process. |
LS in general |
|
CR2. Loss, damage or disturbance of Esselen cultural
properties (traditional cultural properties) or setting for properties
in project area (NHPA Criterion A: contributes to broad pattern
of history; TCP importance to culture of a people) |
Implement Programmatic Agreement pursuant to
NHPA Section 106; develop umbrella Historic Property Management
Plan for sites in this class, and individual treatment plans
for each eligible site to be approved by PA signatories. SEIR
recommends design changes and construction exclusion areas as
feasible to avoid and minimize construction impacts; funding
cultural center and other educational efforts to compensate for
unavoidable loss; active participation of Esselen as resource
specialists during construction; long-term Esselen access to
area for traditional plant gathering, dances, prayer and other
cultural activities (SEIR 7.2.3-4 and 7.2.3-5) |
Yes, SWRCB Permit 20808 Conditions #45-53;
COE 404 Permit 20364S09 Special Condition
#1.
Specific measures finalized via Section 106
process. |
LS in some cases, SU in others (see
SEIR Table 7-3 for detail) |
|
Public Health and Safety |
|
|
|
|
PH1. Increased risk to worker and public safety
during construction. |
Develop (during final design) and implement Health
and Safety Plan as part of comprehensive Construction Management
Plan. Elements include hiring safety officer, enforcement of
safety plan for workers, vehicles and equipment, fire preparedness
and coordination with fire agencies, detailed fire response plan,
comply with all safety codes and practices, coordination with
community for emergency planning, and other elements. (NLP 15.3.1-1
as amended by 1995 Addendum-2.) |
No |
LS |
|
PH2. Catastrophic failure of dam could result
in property damage and possible injury and loss of life. |
Design , construction and operation of dam must
comply with state standards and be approved and permitted by
state dam safety agency. Perform dam failure analysis for worst
case scenario to predict potential impact, then develop Emergency
Action Plan for evacuation. (NLP 15.3.1-3.) |
Yes, SWRCB Permit 20808 Condition #18 |
LS |
|
PH3. Increased flows (and thus vegetation) due
to project operation could result in channel narrowing downstream,
and increase extent of 100-year floodplain |
See H2. Carry out approved 20-year monitoring
plan for changes in channel capacity and riparian vegetation
growth. If adverse trend observed, implement agency-approved
corrective measures such as selective channel clearing and sediment
removal. (NLP 15.3.1-2.) |
Yes, SWRCB Permit 20808, Condition #22 and 45;
COE 404 Permit 20364S09 Special Condition #3 |
LS |
|
Land Use, Planning, Recreation |
|
|
|
|
L1. Affect to 23 acres of existing Ventana Wilderness |
Exchange of over 140 acres of similar quality
habitat adjacent to Wilderness boundary. U.S. Forest Service
"directed" to make this exchange if project approved.
(NLP 17.3.1-1) |
Land exchange required by act of Congress (Public
Law 101-539) |
LS |
|
L2. Recreation at Cachagua Community Center and
park, and nearby residences affected by construction traffic,
noise, dust |
See mitigation measures for traffic, noise and
climate/air quality |
No |
SU |
|
L3. Inundation of portions of Carmel River Trail
(public access route through private land to Ventana Wilderness);
restrictions on trail use during construction |
Replace hiking trail by permanent unpaved access
road to fish screening facility. Shuttle service during construction.
(NLP 17.3.1 through 17.3.1-3; SEIR F3 and F4) |
No |
LS |
|
Growth Inducement |
|
|
|
|
G1. Project could indirectly result in release
of estimated 799 af of metered sales for new connections and
remodels by MPWMD, contributing to adverse regional traffic and
air quality impacts |
Consider phasing release of water for growth
consistent with regional air quality management plan and with
traffic infrastructure. Traffic and air quality measures are
beyond authority of MPWMD. (NLP 19.0; SEIR 10.4.1) Change in
project scope requires regulatory approvals. |
No |
PSU |