May 2019 Draft
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RAYMONDVILLE DRAIN PROJECT FOR FLOOD CONTROL FROM: NEAR EDINBURG LAKE IN HIDALGO COUNTY, TX TO: THE LAGUNA MADRE IN WILLACY COUNTY, TX DRAFT SUPPLEMENTAL ENVIRONMENTAL IMPACT STATEMENT Prepared for: Hidalgo County Drainage District No. 1 Prepared by: S&B Infrastructure, Ltd. MAY 2019 DRAFT SUPPLEMENTAL ENVIRONMENTAL IMPACT STATEMENT For The RAYMONDVILLE DRAIN PROJECT FROM NEAR EDINBURG LAKE IN HIDALGO COUNTY TO LAGUNA MADRE IN WILLACY COUNTY, TEXAS MAIN REPORT July 2017 This page has been left blank intentionally. ABSTRACT DRAFT SUPPLEMENTAL ENVIRONMENTAL IMPACT STATEMENT RAYMONDVILLE DRAIN PROJECT PROJECT FOR FLOOD CONTROL FROM NEAR EDINBURG LAKE IN HIDALGO COUNTY TO LAGUNA MADRE IN WILLACY COUNTY, TEXAS The responsible lead agency is the United States Army Corps of Engineers (USACE), Galveston District. The local sponsor is the Hidalgo County Drainage District No. 1 (HCDD#1). Abstract: This Draft Supplemental Environmental Impact Statement (DSEIS) was prepared as required by the National Environmental Policy Act (NEPA) to present information regarding the potential impacts of proposed improvements to the Raymondville Drain. The proposed project extends from Edinburg Lake in Hidalgo County to east of La Sal Vieja Lake in Willacy County, Texas. Refer to Appendix A for a copy of the Alternative Exhibits and Photographs. The purpose and need for the project is to improve the drainage systems in order to provide increased flood protection and additional drainage capacity for Hidalgo and Willacy County. Several alternatives for the improvement of the Raymondville Drain were evaluated from Edinburg Lake to east of La Sal Vieja Lake. The DSEIS addresses the direct, indirect, and cumulative impacts of the recommended plan on human and environmental issues, including the following: water and sediment quality; waters of the United States, including wetlands; land use; habitat types; aquatic communities; wildlife resources; cultural resources; air quality; noise; hazardous, toxic, and radioactive wastes; socioeconomic issues; flooding; bank erosion; and prime farmlands. THE OFFICIAL CLOSING DATE FOR THE RECEIPT OF COMMENTS IS 30 DAYS FROM THE DATE ON WHICH THE NOTICE OF AVAILABILITY OF THIS DSEIS APPEARS IN THE FEDERAL REGISTER. Further Information on this DSEIS, please contact: Andrea Catanzaro U.S. Army Corps of Engineers, Galveston District P.O. Box 1229 Galveston, Texas 77553-1229 Commercial telephone: 409.766.6346; Fax: 409.766.3931 E-MAIL:[email protected] i Main Report 1.0 Need for Proposed Action 2.0 Alternatives 3.0 Affected Environment 4.0 Environmental Consequences 5.0 Mitigation 6.0 Compliance with Texas Coastal Management Program 7.0 Consistency with State and Federal Regulations 8.0 Any Adverse Environmental Impacts that Cannot Be Avoided Should the GRP Alternative Be Implemented 9.0 Any Irreversible or Irretrievable Commitments of Resources Involved in the Implementation of the GRP Alternative 10.0 Relationship Between Local Short-Term Uses and Man’s Environment and the Maintenance and Rehabilitation of Long-Term Productivity 11.0 Energy and Natural or Depletable Resource Requirements and Conservation Potential of Various Alternatives and Mitigation Measures 12.0 Public Involvement, Review and Consultation 13.0 List of Preparers 14.0 References 15.0 Glossary 16.0 Index Appendices A Alternative Exhibits and Photographs C Public Involvement B Preferred Alternative Exhibits D Habitat Evaluation Procedures E Hazardous Materials F Agency Coordination G Biological Assessment H Cultural Resources I Socioeconomics and Land Use Baseline J Cumulative Impacts Analysis K Mitigation L Texas Coastal Zone Management Program Consistency M Record of Decision N Greenhouse Gas Emissions and Climate Change O Project Area Floodplain P Peer Review Comment/Response Matrix iii EXECUTIVE SUMMARY ES. 1 INTRODUCTION AND AUTHORITY The Raymondville Drain Project, under the development of the US Army Corps of Engineers (USACE) – Galveston District currently exists as an authorized federal project under the Project for Flood Control, Lower Rio Grande Basin, Texas under Title IV, Section 401 of Water Resource Development Act (WRDA) 1986. Currently, the project limits for the federally authorized Raymondville Drain Project are from approximately Delta Lake in Hidalgo County to near the Laguna Madre in Willacy County, Texas. The following report documents field investigations, analysis, and impact assessment for the watershed areas associated with the study area from near Edinburg Lake in Hidalgo County to Laguna Madre in Willacy County, TX. At this time, it is not to be considered a final assessment of environmental impacts for the authorized Raymondville Drain Project; but rather, a draft summary of investigations and potential environmental impacts within the study area from near Edinburg Lake in Hidalgo County to Laguna Madre in Willacy County, TX, until the authorized project is re-defined. ES. 2 PURPOSE AND NEED The proposed improvements include potential new storage channel/ditch/pond facilities, and the widening of existing channels/ditches. The existing outfall/drainage systems related to the Raymondville Drain Outfall System were originally designed to convey agricultural run-off from a 9.5-year storm event. These related systems are not conducive of the recent and extraordinary urban growth of Hidalgo County (Hidalgo County population is continuing to grow at an accelerated rate: 2000 population was approximately 569,463; 2025 population is estimated to be 1,071,012.) ES. 3 DESCRIPTION OF THE PROPOSED ACTION AND ALTERNATIVES This Draft Supplemental Environmental Impact Statement (DSEIS) was prepared for the proposed improvement to the Raymondville Drain in Hidalgo and Willacy County, Texas. The Hidalgo County Drainage District No.1 is the Non-Federal sponsor for the Raymondville Drain Project from Edinburg Lake in Hidalgo County to just east of La Sal Vieja Lake in Willacy County. To determine proposed improvements effects on the human and natural environments, several resources within the action area were evaluated and potential concerns addressed and include the following: Water Quality Sediment Quality iv Waters of the United States, Including Wetlands Land Use Vegetation/Habitat Aquatic Communities Wildlife Resources Cultural Resources Air Quality Noise Hazardous, Toxic, and Radioactive Wastes Socioeconomic Issues Floodplains Bank Erosion Prime Farmlands In addition to the Build Alternatives, a No Action Alternative was developed during preliminary screening and is included in this DSEIS. The No Action Alternative is based on the current conditions of the project corridor and assumes that the Raymondville Drain Project will not be implemented, hence retaining the existing drainage systems at its current capacity. While the No Action Alternative does not have a construction cost or project related impacts on the environment per se, flood damage to residential, commercial, and agricultural areas would continue to increase. Flooding is a real and growing problem that affects our environment and communities and cost real money. The No-Action Alternative is not a reasonable alternative and clearly does not address the project need and purpose but it is carried forward and evaluated as a baseline against which the Build Alternatives can be compared. The following sections summarize the anticipated effects of the proposed project on each of the above listed resources. Impacts under the No Action alternative would be limited to effects resulting from not implementing the proposed project. Section ES. 4 of the DSEIS focuses on the effects of the Preferred Alternative. Section ES.6 summarizes the mitigation proposed for the project, and Sections ES.7 and ES.8 discuss the project consistency with state and federal regulations and public involvement that has occurred. ES. 4 POTENTIAL ENVIRONMENTAL IMPACTS Water Quality The primary water quality concerns in the Raymondville Drain include aspects of salinity, and water chemistry. The primary apparent impact of the proposed project to water quality would be turbidity associated with dredging and placement activities. Increases in turbidity are expected to be temporary, with ambient conditions expected to return soon after dredging and dewatering activities are completed. The proposed action is not expected to change or increase the salinity of water in the action area. No long-term effects on water quality are expected as a result of the proposed action. v Sediment Quality The sediment quality component of the Raymondville Drain includes sediment quality and sediment transport. Sediment transport into the Raymondville Drain affects siltation rates, which determines the projected frequency of maintenance dredging that would be required for the proposed action. Siltation could also impact aquatic habitats where water flow is reduced. Waters of the United States, Including Wetlands Several depressions were observed based on a review of aerial photographs, National Wetland Inventory (NWI) Maps, and on-ground examinations. The depression areas, which are located in agricultural fields, are isolated low areas on the terrain that are surrounded by uplands. Potential impacts to isolated depression areas and associated wetlands will require coordination with USACE. Land Use The proposed Raymondville Drain project is located in Hidalgo and Willacy County. The majority of the project study area is located in rural areas and is comprised of agricultural properties and undeveloped