Station 1 Project Location

Transcription

1 Station 1 Project Location SUTTER BYPASS FEATHER RIVER Fremont Weir NATOMAS CROSS CANAL PLEASANT GROVE CREEK CANAL PLEASANT GROVE CREEK SUTTER CO PLACER CO YOLO BYPASS SACR AMENTO RIVER (STEELHEAD CREEK) Natomas Basin NATOMAS EAST MAIN DRAINAGE CANAL DRY CREEK PLACER CO SACRAMENTO CO RIO LINDA CREEK MAGPIE CREEK DIVERSION CHANNEL FOLSOM DAM FOLSOM LAKE Weir ROBLA CREEK ARCADE CREEK AMERICAN RIVER SACRAMENTO CO EL DORADO CO SACRAMENTO BYPASS BUSINESS 0 West MORRISON CREEK SOLANO CO YOLO BYPASS SACRAMENTO DEEP WATER CHANNEL YOLO CO Freeport LAGUNA CREEK FLORIN CREEK UNIONHOUSE CREEK ELDER CREEK N. FORK LAGUNA CREEK 0 2. MILES Redding San Francisco Monterey Project Vicinity Bakersfield NOT TO SCALE Los Angeles San Diego

2 Station 2 Project Purpose and Need Lone Tree Rd SR- SR- El Centro Rd Natomas Blvd Truxel Rd E Levee Rd Northgate Blvd P L A C E R C O. S U T TER C O. Locust Rd SAFCA s Project Purpose Provide at least 100-year flood protection as quickly as possible while laying the groundwork to achieve at least 200-year flood protection over time Levee Segments Requiring Seepage Remediation and Levee Height Increases Reach 6 Reach 7 Howsley Rd Project Need: Levee Problems Seepage: Geotechnical studies have identified seepage beneath and through segments of the Natomas levee system as a significant risk to the stability and reliability of the system. Vernon Rd Reach 4 Reach Pleasant Grove Grove Creek Creek Canal Canal Keys Rd Fifield Rd R: ft R: ft R: ft Reach 4A R:4a ft Reach 4B R:4b ft R:4b ft Reach A R:a - 1. ft Reach 7 Reach 6A Reach 6B Reach B R:6b - 2 ft R:7-2.2 ft R:b ft R:6a - 2 ft R:8-2 ft Reach 8 R:9a ft Reach 9A R:9b ft Height Deficiency: Much of the Natomas levee system is not high enough to meet the FEMA criteria for the National Flood Insurance Program and the Urban Level of Flood Protection required by state law. Reach 9B 0 R:10-1. ft R:11a ft I- Natomas East East Main Main Drainage Drainage Canal/Steelhead Canal/Steelhead Creek Creek Encroachments: USACE levee guidance requires the removal of vegetation greater than 2 inches in diameter on the levee slopes and within 1 feet of the waterside and land-side levee toes. Other encroachments that penetrate the levee and limit access on the land side and the water side (e.g., fences, retaining walls and driveways) may also be subject to removal. 1A R:11b - 1.1ft 1B 2 3 I- Arena Blvd Del Paso Rd N Market Blvd 4 Natomas East Main Drainage Canal and American River (additional remediation being evaluated) Underseepage Vulnerability Average Levee Height Deficiency Levee Height Deficiencies: > 2.49 (ft) Levee Height Deficiencies: (ft) Levee Height Deficiencies: (ft) Levee Height Deficiencies: (ft) 0 3,000 6,000 S acr acr e r amen amen to to Riv Riv 6 7 8A 8B W El Camino Ave 9B 9A 0A 0B I- San Juan Rd Reach 4 ver Ri can Ameri Aerial Image: NAIP 2006 X /08 Source: HDR 2007, Wood Rodgers 2007, SACOG 2006, EDAW 2007

3 Station 4 Summary of NLIP Phase 2 Modifications Soil Borrow and Haul Routes Two potential borrow sites Sutter Pointe and Dunmore have been added to the construction plan. The Brookfield and Airport North Borrow sites have been designated as preferred, while the RD 1001 site would remain as a back-up. The Vestal, Spangler, Nestor, and Bolen South sites have been dropped from consideration. Design changes have increased the soil borrow requirement from 1.6 million to 2.8 million cubic yards. Sankey Road, nue, Powerline Road, and a portion of Riego Road have been eliminated as haul routes. Several off-road routes have been added at the Airport North Bufferlands. The haul route on West Elverta Road has been extended eastward approximately 1 mile to provide access to and from the Dunmore borrow site. Construction Phasing and Timing The limit of the Phase 2 construction footprint along the River East Levee has shifted 14,000 feet south to the end of reach 4B. Phase 2 levee construction start has been delayed to May 2009 and may overlap with Phase 3 construction. Construction of cutoff walls on a 24-hours-per-day, 7-days-per-week basis will take place as needed to complete work prior to the flood season. Levee Design and Seepage Remediation The design of the NCC south levee raise in Reaches 1 and 2 has been widened to the land side to reduce the need for vegetation removal on the water side. Seepage remediation measures in the River east levee (Reaches 1-4B) have been modified as follows: cutoff walls would be added for, and cutoff walls would replace seepage berms in used in Reaches 2 and 3 seepage berms have been widened in several locations in Reach 4B. River adjacent setback levee slope has been flattened from 3H:1V to H:1V in Reaches 1, 4A, and 4B. A portion of the seepage berm in Reach 4B of the River east levee would be widened to 00 feet, reducing the need for relief wells, to help minimize impacts to cultural resources. Land Use and Habitat The existing condition at the Airport North Bufferlands (NOP baseline) has changed from active rice cultivation to fallow field. A planned 118-acre marsh at Airport North Bufferlands has been eliminated. Compensation for alfalfa foraging habitat that may be lost as a result of Phase 2 construction has been added to the habitat plan. Worth Rd 0 3,00 7,000 Feather River Borrow Sites and Anticipated Haul Routes Potential On Road Haul Routes Potential Off-Road Haul Routes RD 1001 Borrow Site Potential Borrow Sites Basemap: CaSIL, SACOG 2006 Vernon Rd Co Rd 107a Co Rd 16 River Garwood Rd LANDSIDE HAUL TRUCK ROUTE Hwy Source: Mead & Hunt 2007, EDAW 2007 West Catlett Rd Airport North Bufferlands Dunmore Striplin Rd Sutter Pointe Brookfield Fifield Rd Catlett Rd Howsley Rd Keys Rd Sorento Rd

4 Station 3 SAFCA EIR Documents and Relationships This Subsequent EIR will focus on changes to the Phase 2 (formally called the 2008 phase of construction) Project and new significant environmental effects driven by those modifications, as required under CEQA. The Phase 2 Project consists of levee upgrades and seepage remediation for the south levee and River east levee (Reaches 1-4B), relocation of the northern portion of the Elkhorn Canal, and creation of the first section of a new GGS/Drainage Canal. This phase was originally analyzed in the Natomas Levee Improvement Program Landside Improvements Project EIR, which the SAFCA Board of Directors certified in November October 2, 2008 EIR Process Timeline Subsequent EIR for Phase 2 Project November 3, 2008 November 18, 2008 January 2, 2009 Issue NOP Close of scoping period Release Public Draft SEIR Close of public comment period TIER 1 CEQA Lead Agency - SAFCA February 2007 Program EIR Project EIR Local Funding Mechanism for Comprehensive Flood Control South Levee Improvements for the Area Phase 1 Improvements January 27, 2009 February 19, 2009 Issue Final SEIR Certify Final SEIR and file Notice of Determination TIER 2 TIER 3 November 2007 Project/Program EIR Landside Improvements Project In Preparation Subsequent EIR Landside Improvements Project Phase 2 In Preparation Project/Program EIR Phase 3 (Project) and Phase 4 (Program) Landside Improvements Planned Project EIR Phase 4 Landside Improvements

5 Station Metro Air Pkwy EAST EAST DRAINAGE DRAINAGE CANAL CANAL Overview of Phase 2 Project Features Potential Borrow Areas Levee Improvements Future Landside Slope Toe (NCC) Adjacent Setback Levee Phase 2 Flood Control Limit Woodland Corridor New Canal Alignments GGS/Drainage Canal Elkhorn Canal Sedimentation Basin 0 1, 3,00 Aerial Image: NAIP 2006 X / ro ro ss ss Ca Ca naa l C as m N ato Brookfield Sutter Pointe Deep culvert to be removed beneath levee at Pumping Plant No. 2 site Reach 4A R ive r nto ame S ac r DRAINAGE CANAL EAST DRAIN ROAD Reach 4B Elkhorn Ca nal GGS/Drainage Canal Airport North Bufferlands Dunmore Reach B Reach A Pritchard Ave Reach 6A Relocated Elkhorn Reservoir Power Line Rd Scho AIRPORT WEST DITCH Source: HDR 2008, Wood Rodgers 2007, Mead & Hunt 2008, SACOG 2006, SCAS 2008