United States Section; Notice of Availability of a Final Environmental Assessment and Finding of No Significant Impact for Improvements to the Rio Grande Rectification Project in El Paso and Hudspeth Counties, TX, 10275-10277 [E9-5065]

Agencies

• International Boundary and Water Commission, United States and Mexico

[Federal Register Volume 74, Number 45 (Tuesday, March 10, 2009)]
[Notices]
[Pages 10275-10277]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E9-5065]


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INTERNATIONAL BOUNDARY AND WATER COMMISSION, UNITED STATES AND MEXICO


United States Section; Notice of Availability of a Final 
Environmental Assessment and Finding of No Significant Impact for 
Improvements to the Rio Grande Rectification Project in El Paso and 
Hudspeth Counties, TX

AGENCY: United States Section, International Boundary and Water 
Commission, United States and Mexico (USIBWC).

ACTION: Notice of Availability of Final Environmental Assessment (EA) 
and Finding of No Significant Impact (FONSI).

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SUMMARY: Pursuant to Section 102(2)(c) of the National Environmental 
Policy Act (NEPA) of 1969, the Council on Environmental Quality Final 
Regulations (40 CFR Parts 1500 through 1508), and the United States 
Section, International Boundary and Water Commission's (USIBWC) 
Operational Procedures for Implementing Section 102 of NEPA, published 
in the Federal Register September 2, 1981, (46 FR 44083); the USIBWC 
hereby gives notice of availability of the Final Environmental 
Assessment and FONSI for Improvements to the Rio Grande Rectification 
Project (RGRP) located in El Paso and Hudspeth Counties, Texas are 
available.

FOR FURTHER INFORMATION CONTACT: Lisa Santana, Environmental Protection 
Specialist, Environmental Management Division, United States Section, 
International Boundary and Water Commission; 4171 N. Mesa, C-100; El 
Paso, Texas 79902. Telephone: (915)

[[Page 10276]]

832-4707; e-mail: lisasantana@ibwc.gov.

DATES: The Final EA and FONSI will be available March 13, 2009.

SUPPLEMENTARY INFORMATION:

Background

    The RGRP is a flood control and water delivery project completed in 
1938 along the Rio Grande in El Paso and Hudspeth Counties, Texas. The 
RGRP, extending approximately 91 miles from El Paso to Fort Quitman, 
consists of a flood control levee system along the United States and 
Mexico margins of the Rio Grande, a maintained floodway enclosed by the 
levee system, and a dredged river channel.
    The USIBWC identified the RGRP as a priority area to improve flood 
containment and restore normal flow capacity of the river channel. 
Flood control is the core mission of the RGRP whose economic benefits 
have been estimated at over $140 million in terms of protection of 
residential, industrial, and commercial structures, and agricultural 
use. The RGRP was also built to ensure efficient delivery of water for 
irrigation and other uses in the United States and Mexico. A need has 
been identified to restore normal flow capacity of the river, reduced 
by sediment deposition, to improve irrigation water delivery and comply 
with existing agreements between the two countries.

Proposed Action

Alternatives to the Proposed Action

    The proposed action to improve functionality of the RGRP has two 
components, raising the levee system along various river segments to 
meet current flood control requirements, and dredging the river channel 
to restore normal flow capacity.
    To increase flood containment capacity, fill material would be 
added on top of the levee system to bring height to its original design 
specifications, or to meet current flood control requirements. Various 
sections of the RGRP levee system along the United States margin of the 
Rio Grande would be raised up to 4 feet, using compatible fill material 
obtained from commercial sources. Height increase would result in 
expansion of the levee footprint, up to a maximum of 12 feet on each 
side of the levee. The expansion would take place along the levee 
service corridor currently utilized for levee maintenance, and entirely 
within the RGRP right-of-way. Excavation outside the levee structure is 
not an anticipated need.
    Normal flow capacity of the river, reduced by sediment deposition, 
would be restored to ensure efficient water delivery and comply with 
existing agreements between the two countries. Dredging to be conducted 
by the USIBWC would cover three Rio Grande segments with an approximate 
combined length of 45 miles within the RGRP.

Summary of Findings

    Pursuant to National Environmental Policy Act (NEPA) guidance (40 
Code of Federal Regulations 1500-1508), The President's Council on 
Environmental Quality issued regulations for NEPA implementation which 
included provisions for both the content and procedural aspects of the 
required Environmental Assessment (EA). The USIBWC completed an EA of 
the potential environmental consequences of improvements to the flood 
control and water delivery capabilities of the RGRP. The EA, which 
supports this Finding of No Significant Impact, evaluated the No Action 
Alternative and Proposed Action.

Potential Environmental Impacts

No Action Alternative

    The No Action Alternative was evaluated as the single alternative 
action to the Proposed Action. The No Action Alternative would retain 
current conditions of the RGRP in terms of the levee system 
configuration and sediment deposition in the river channel, with no 
impacts to biological and cultural resources, land use, or 
environmental health issues. In terms of flood protection, however, 
current containment capacity under the No Action Alternative may be 
insufficient in fully controlling the Rio Grande flooding under severe 
storm events, with associated risks to personal safety and property. 
Non-implementation of dredging operations would be detrimental to 
extensive irrigated areas served by the RGRP due to inefficiency in 
water deliveries, and would fail to comply with existing boundary 
agreements between the two countries.

Proposed Action

Biological Resources
    Placement of fill material on the levee would affect herbaceous 
vegetation present on footprint expansion locations and slope of the 
levee structure. All expansion would take place along the current levee 
service corridor, limiting vegetation removal to currently managed 
areas; this plant cover is expected to rapidly re-establish after 
project completion.
    No significant effects are anticipated on wildlife habitat in the 
vicinity of the levee system. In areas requiring levee footprint 
expansion, impacts on vegetation would be limited to non-native managed 
salt cedar habitats and managed old-field habitats along the levee that 
are of very limited value as wildlife habitat. Levee expansion may 
remove some habitat for the Species of Concern Burrowing Owl, but levee 
expansion would occur outside the breeding season of the owls to reduce 
impacts. Further, the levee expansion will not be in conflict with the 
burrowing owl management plan. No jurisdictional wetlands are located 
within the potential levee expansion area, potential bed down areas or 
disposal sites.
    Dredging operations would remove vegetation along some sections of 
the riverbanks. The river does not contain wetlands, and the vegetation 
communities along the river are expected to rapidly re-establish after 
project completion. Dredging is not expected to have an effect on 
wildlife, including T&E species. Sediment disposal areas are outside 
the floodway, and sediment disposal would not affect sensitive habitats 
or wetlands.
    Levee expansion would not affect aquatic resources of the Rio 
Grande. Dredging operations would temporarily affect aquatic habitats 
and resources; however, dredging operations would occur during low- or 
no-flow conditions. Therefore, aquatic habitats will be minimally 
affected by dredging operations.
    Levee expansion and dredging operations will not affect unique or 
sensitive areas, including the Rio Bosque Wetlands Park.
Cultural Resources
    Levee footprint expansion would take place along the current levee 
service corridor. The use of heavy equipment in the floodway and 
staging areas (including equipment yards and soil storage areas) to add 
and move soil material for levee expansion may cause soil disturbance 
several inches deep in the service corridor. Based on the results of 
previous trenching for geoarchaeological investigations in the project 
area, the upper 10 to 20 inches (25 to 50 centimeters) of the floodway 
exhibit evidence of leveling and mixing due to disturbances such as the 
original construction of the RGRP levee in the 1930s and ongoing 
floodway maintenance. Archaeological resources occurring up to this 
depth likely lack physical integrity and context and would most likely 
not be eligible for the National Register of Historic Places

[[Page 10277]]

(NRHP). Levee footprint expansion may cap more deeply buried, intact 
archaeological resources with soil and gravel and could result in 
either a potentially beneficial or a potentially adverse effect to 
these resources. Architectural resources may be adversely affected by 
expansion of the levee footprint. Potential effects include vibration 
and ground disturbance from the use of heavy equipment during 
construction as well as effects caused by alterations to the levee 
itself; however, the increased height of the levee is not expected to 
change the flow of water to or from architectural resources. Under 
NEPA, there will be no significant impacts (i.e., ``unresolvable'' 
adverse effects under NHPA) to cultural resources because 
archaeological resources in the APE will be identified and 
architectural resources will be evaluated for NRHP eligibility prior to 
implementation of levee footprint expansion. Native American resources, 
including river access and sensitive Native American plant resources, 
may be altered by the levee improvements; consultation with the Native 
American tribes will assist in scheduling construction during times 
when the river and plants are not being used for ceremonial purposes.
    There are no anticipated effects of dredging on archaeological 
resources. Dredging within the river channel will occur to a depth of 3 
feet and simply remove silt deposited since previous dredging was 
conducted. Movement of heavy equipment used to dredge material from the 
river may disturb soil several inches deep in the floodway along the 
river and in staging areas, but no NRHP-eligible resources are expected 
to occur at that depth. If architectural resources (e.g., lateral drain 
abutments) are in the areas of dredging operations, they would be 
avoided and would not be affected. Native American resources, including 
river access and sensitive Native American plant resources, could be 
adversely affected by dredging operations.
    Intensive archaeological and architectural surveys to identify and 
evaluate cultural resources in the project area will be conducted in 
accordance with Texas State Historic Preservation Office (SHPO), (Texas 
Historical Commission [THC]), requirements. Cultural resources in the 
project area may include archaeological sites as well as levee-related 
resources, irrigation-related resources, roadway bridges, and culverts.
Water Resources
    Improvements to the RGRP levee would increase flood containment 
capacity with a negligible increase in floodwater surface elevation. 
Levee footprint expansion would not affect water supply or management, 
agricultural water uses, or water quality.
    Dredging operations would improve water flow within the river. 
Water supply and water management would be improved by making delivery 
of irrigation water more efficient. Dredging operations would 
temporarily affect water quality, but effects would attenuate with 
distance and would subside at the conclusion of the operations. 
Dredging operations would be scheduled to occur during low flow or no 
flow conditions to minimize impacts to water quality.
Land Use
    Footprint levee expansion, where required, would take place 
completely within the existing right-of-way and along the levee service 
corridor. No urban or agricultural lands would be affected. Dredging 
operations, including equipment staging, would occur within the 
existing USIBWC right-of way outside the floodway. Sediment disposal 
would occur at pre-selected sites along the levee service corridor, 
outside the floodway, or on farmland by request. Dredged sediment 
disposed of on farmland could be used as a soil amendment and improve 
drainage in agricultural fields.
Community Resources
    Residents and property along the RGRP would benefit from the 
continued flood protection. The influx of federal funds into El Paso 
and Hudspeth Counties from levee improvements and dredging operations 
would also have a positive local economic impact, largely limited to 
the construction period. The benefit would be small for El Paso County 
given its large economic base, less than 1% of the annual county 
employment, income and sales values. The effect would be more 
substantial in Hudspeth County because of its small population. No 
adverse impacts to disproportionately high minority and low-income 
populations were identified for construction activities. Moderate 
utilization of public roads would be required during construction, with 
a temporary increase in access road for equipment mobilization to 
staging areas.
Environmental Health Issues
    Estimated air emissions of five criteria pollutants during 
construction would be discontinuous and represent less than 0.3 percent 
of the annual emissions inventory for El Paso County, and less than 1.5 
percent for Hudspeth County. There would be a moderate increase in 
ambient noise levels due to construction activities. Neither long-term 
nor regular exposure is expected above noise threshold values. A 
database search indicated that no waste storage and disposal sites were 
within proposed work areas, and none would affect, or be affected, by 
the proposed RGRP improvements.
Best Management Practices
    Best management practices and mitigation measures would be 
implemented as part of the Proposed Action to minimize the potential 
for impacts to natural resources, and mitigation measures used 
compensate for potential adverse effects. Best managements practices 
during construction would include use of sediment barriers and soil 
wetting to minimize erosion and dust.
    Levee expansion alignment would be optimized, to the extent 
possible, to avoid impacts to riparian native wooded vegetation, 
including mature woody trees, if present. The project would comply with 
U.S. Environmental Protection Agency (USEPA) requirements for 
construction and equipment staging areas to avoid impacts on water 
quality and other aquatic resources. Continued coordination with the 
Texas Parks and Wildlife Department (TPWD) will be necessary for 
protection of burrowing owl nesting locations, including schedule 
modification of levee improvement operations. To protect wildlife, 
construction activities would be scheduled to occur, to the extent 
possible, outside the March 1st to August 31st bird migratory season as 
required by the United States Migratory Bird Treaty Act.
    Availability: The Final Environmental Assessment and Finding of No 
Significant Impact are available at the USIBWC homepage at https://
www.ibwc.state.gov/Organization/Environmental/reports_studies.html.

    Dated: March 6, 2009.
Robert McCarthy,
General Counsel.
 [FR Doc. E9-5065 Filed 3-9-09; 8:45 am]
BILLING CODE 7010-01-P