** Amendment 0007 - see amendment for details.** ** Amendment 0006 - see attachments for details.** ** Amendment 0005 - see attachments for details.** **Amendment 0004 - see attachments for details. NOTE: Please include your offer amount for each of the CLINs on the CLINs particular to that amendment. There is no pricing sheet that includes all CLINs. All CLINs must have an amount entered. ** **Amendment 0003 - see attachment for details.** ** Amendment 0002 - See attached amendment for details.** **Amendment 0001 - See attached amendment for details.**The United States Army Corps of Engineers (USACE) Sacramento District (SPK) anticipates a potential requirement to remove and replace existing railroad curves located at the Military Ocean Terminal Concord (MOTCO), Concord CA The Rail Curve Package 2 repair scope includes reconstruction/replacement/demolition of approximately 7500 linear feet of rail, including repairs or replacement of ties, rails and other track hardware at multiple rail curves on the tidal side of the installation at Military Ocean Terminal Concord (MOTCO). The base bid package includes repair by replacement of curves 6, 11 and 12 with curvature less than 12 degrees, demolition of curves 4 and 5. Curve 19 is an optional repair by replacement with connection to a UPRR-owned mainline siding. Tracks will be constructed per standards in UFC 4-860-01FA and AREMA Manual for Railway Engineering.