USACE SPK DBB Construction - ARCF Natomas Reach E - Sutter County, CA

////////////////////////////////////////////////////////////////////The purpose of amendment 0004 is as follows: (1) Update Attachment 02 - Wage Determination from General Decision Number: CA20220007 dated 16 Dec 2022 to General Decision Number: CA20230007 dated 20 Jan 2023. (2) Add Attachment 12 - Specifications (Revised 31 Jan 23).////////////////////////////////////////////////////////////////////The purpose of amendment 0003 is as follows:(1) Add attachment 11 - ARCF Reach E Geotechnical Data Report. ////////////////////////////////////////////////////////////////////The purpose of Amendment 0002 is the following: (1) Change the date ProjNet will close for new inquiries from 1:00 PM (1300) Pacific Standard Time (PST), 22 January 2023, to 1:00 PM (1300) PST, 23 January 2023. (2) Add Attachment 07 - Pre-Bid Meeting Attendance Roster (In Person) - 18 Jan 23 (3) Add Attachment 08 - Pre-Bid Meeting Virtual Attendance Roster - 18 Jan 23 (4) Add Attachment 09 - Site Visit Attendance Roster - 18 Jan 23 (5) Add Attachment 10 - ARCF Reach E Pre-Bid Meeting Presentation - 18 Jan 23////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////*Update*The purpose of Amendment 0001 is to make the following changes: 1. Update Attachment 6 - Site Visit Information2. Update Section 00 21 13 - Instructions to Bidders////////////////////////////////////////////////////////////////////USACE SPK has a requirement for design-bid-build construction services to construct a seepage cutoff wall adjacent to the landward side of the existing levee of the ARCF Natomas Basin Reach E segment, located in Pleasant Grove, CA. The Natomas Basin Reach E segment is located along the southwest bank of the Pleasant Grove Creek Canal (PGCC). The PGCC is an artificial channel that trends generally south-southeast to north-northwest, collecting surface water draining from Pleasant Grove Creek and several other seasonal streams from the east. The surface water is directed north-northeast into the Natomas Cross Canal and eventually to the Sacramento River. Reach E currently extends 3.4 miles between Sankey Road north to Howsley Road. The typical levee cross section has a crown width of twenty (20) feet, an asphalt road used by local traffic, and landside and riverside slopes of 1 vertical to 3 horizontal (1V:3H). The levee height varies between five (5) and seventeen (17) feet along the reach. The requirement is anticipated to include construction of a seepage cutoff wall adjacent to the landward side of the existing levee, including soil bentonite (SB) open trench construction using native soil with bentonite and water. It is anticipated the project requirements will include construction of a landside patrol road along the entire length of Reach E, that includes access ramps at identified locations; excavation and replacement of five (5) culverts; excavation and replacement of five (5) existing metal gatewells; excavation and replacement of a manhole; removal and relocation of irrigation systems; borrow site excavation; performance of Storm Water Pollution Prevention Plan (SWPPP) documents and implementation; and Best Management Practices (BMPs) installation. It is estimated that construction of the potential requirement can be completed within two (2) construction seasons, or approximately six hundred and six (606) calendar days.