Am0001.pdf

Am #0001 - 1

DEPARTMENT OF THE ARMY

Omaha District, Corps of Engineers 1616 Capitol Avenue Omaha, Nebraska 68102-4901

:NOTICE: Failure to acknowledge : Solicitation No. W9128F 13 B 0002 :all amendments may cause rejec- :

:tion of the bid. See FAR : Date of Issue: 18 Dec 2013 :52.214-3 of Section 00 21 00 : New Date of Opening: 24 Jan 2013

Amendment No. 0001 11 January 2013

SUBJECT: Amendment No. 0001 to Specifications and Drawings for Construction of Levee Rehab, Lake Waconda, Cass County, NE.

Solicitation No. W9128F 13 B 0002.

TO: Prospective Bidders and Others Concerned

1. The specifications and drawings for subject project are hereby modified as follows (revise all specification indices, attachment lists, and drawing indices accordingly).

a. Specifications. (Descriptive Changes.)

(1) Standard Form SF 1442, Page 00 11 00 -1, delete date and time of bid opening shown and substitute "24 January 2013" at "2:00 pm".

(2) Section 32 92 19 Page 6, paragraph 2.4, add the following at the end of the paragraph:

“2.4.1 Straw

Stalks from oats, wheatm rye, barley or rice. Furnish in air-dry condition and of proper consistency for placing with commercial mulch blowing equipment.

Straw shall contain no fertile seed.

2.4.2 Hay

Native hay, sudan-grass hay, broomsedge hay, or other beraceous mowings, furnished in an air-dry condition and of proper consistency for placing with commercial mulch blowing equipment. Hay shall be sterile, contain no fertile seed.

2.4.3 Wood Cellulose Fiber

Processed to contain no growth or germination-inhibiting factors and dyed an appropriate color to facilitate placement during application. Composition on air-dry wieght basis: 9 to 15 percent moisture, pH range from 4.5 to 6.0. Use with hydraulic application of grass seed and fertilizer.

2.4.4 Paper Fiber

Paper fiber mulch shall be recycled news print that is shredded forthe purpose of mulching seed.”

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(3) Section 32 92 19 Page 6-7, delete paragraph 2.6 SURFACE EROSION CONTROL MATERIAL in its entirety and substitute “2.6 Not Used.”

(4) Section 01 57 20.00 10 Page 9, delete paragraph 1.9.1 NPDES

Permit for Missouri Construction Activities and substitute “1.9.1 Not Used.”

b. Specifications (New and/or Revised and Reissued). Delete and substitute or add specification pages as noted below. The substituted pages are revised and reissued with this amendment.

Pages Deleted Pages Substituted or Added

Scope of Work Scope of Work

--- Attachment to Section 01 30 00.24: Appendix A

2. This amendment is a part of the bidding papers and its receipt shall be acknowledged on the Standard Form 1442. All other conditions and requirements of the specifications remain unchanged. If the bids have been mailed prior to receiving this amendment, you will notify the office where bids are opened, in the specified manner, immediately of its receipt and of any changes in your bid occasioned thereby.

a. Hand-Carried Bids shall be delivered to the U.S. Army Corps of Engineers, Omaha District, Contracting Division, 1616 Capitol Avenue, Omaha, Nebraska 68102-4901.

b. Mailed Bids shall be addressed as noted in Item 8 on Page 00 11 00-1 of Standard Form 1442.

3. Bids will be received until 2:00 p.m., local time at place of bid opening, 24 January 2013.

Attachments: Spec Pages listed in 1.b. above For Information Only: Site Walk Attendance Sheet from 12/27/2012

U.S. Army Engineer District, Omaha Corps of Engineers 1616 Capitol Avenue Omaha, Nebraska 68102-4901

11 January 2013

MFS/2184

SOW Page 1 Am0001

Lake Waconda 2011 Levee Repairs

Scope-of-Work

Lake Waconda

1. Project Description. The Lake Waconda Levee System, Sanitary and Improvement District No. 1, Cass County, Nebraska is located adjacent to the right bank of the Missouri River at river mile 577.3.

The project consists of 11,500 ft of earthen levee that creates a reservoir and residential area adjacent to the Missouri River. The Sanitary and Improvement District No. 1 is the public sponsor.

This scope of work describes the repairs of three areas damaged as a result of the 2011 Missouri River Flood:

1.1 Area 4 Approximate Station 48+40 to 96+60 – In Area 4, earthen levee materials and vegetation was lost on the slope and at the toe along the riverside of the levee due to a sustained period of high water. The high water on the toe and slope eroded earthen levee material and killed off the existing vegetation over an area approximately 4820 feet in length. The width of the repair area extends 15 feet riverside of the levee toe and up the slope to the water surface elevation associated with the flooding. Currently the vegetation present consists of sparse tall weeds. Repairs will consist of clearing and grubbing the identified area, followed by placement of 6” of top soil and seeding according to the drawings and specifications.

1.2 Area 7 Approximate Station 12+00 to 38+00 – In Area 7, earthen levee materials and vegetation was lost on the slope and at the toe along the riverside of the levee due to a sustained period of high water. The high water on the toe and slope eroded earthen levee material and killed off the existing vegetation over an area approximately 2600 feet in length. The width of the repair area extends 15 feet riverside of the levee toe and up the slope to the water surface elevation associated with the flooding. Currently the vegetation present consists of sparse tall weeds. Repairs will consist of clearing and grubbing the identified area, followed by placement of 6” of top soil and seeding according to the drawings and specifications.

1.3 Area 8 Approximate Station 9+80 to 21+80 – Boils were present along the levee toe within the body of water that is Lake Wa Con Da in an area that was approximately 1200 feet in length. At least four of these boils were large and aggressively moving material. Numerous pin boils were also identified in this reach and extended up to 90 feet from the toe out into the lake. The repair for this area requires a sand berm to be placed landside of the levee out into the lake (placing in the wet).

The berm will be approximately 5 feet thick at the toe of the levee and extend approximately 50 feet out into the lake from the toe. The front face of the berm will be covered with 12 to 18-inches of riprap over a non-woven geotextile to minimize the migration of the berm into the lake. Existing riprap taken from the footprint of the berm shall be used to face the berm.

2. Clearing, Grubbing and Stripping.

2.1 Area 4 and 7 - All vegetation, such as roots, brush, heavy sods, weeds, miscellaneous debris etc, shall be stripped or other unsuitable material removed before topsoil is to be placed. In no case will unsatisfactory material remain in or under the topsoil.

2.2 Area 8 – No grubbing is required for this area.

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3. Materials.

3.1 Area 4 and 7

3.1.1 Topsoil – Satisfactory topsoil shall be obtained from the areas designated on the drawings.

This material shall be placed and blended into the existing slope as the topsoil layer, following completion of clearing and grubbing.

3.1.2 Seeding - Seeding of all constructed and disturbed surfaces shall be in accordance with Specification 32 92 19 SEEDING.

3.2 Area 8

3.2.1 Sand Fill – The berm shall be constructed of sand fill, which consist of cohesionless fill material. Cohesionless fill shall include materials classified in ASTM D 287 as SW, SM AND SP.

Borrow area locations are identified on the drawings. Sand fill shall be free from roots and other organic matter, trash, debris, concrete or rock larger than 1” in diameter and frozen material. Rock smaller than 1-inch in diameter may be utilized in Sand fill areas provided that it is uniformly incorporated and distributed in the fill, comprise no more than 2 percent of a given lift and can be suitably compacted to all sides with sand materials. No unsatisfactory material, encountered while excavating the borrow area, shall be utilized in the berm.

3.2.2 Riprap – Existing riprap removed from the landside levee slope shall be used to face the berm in the water. Addition riprap may be required to bring the riprap to the lines and grades shown on the drawings. Riprap shall be of similar size and gradation to the existing material.

3.2.2.1 Placement - Placement of the riprap shall be within the limits shown on the drawings or as directed by the Contracting Officer’s Representative. Riprap stone shall be placed in such a manner as to produce a reasonably well-graded mass of rock with the minimum practicable percentage of voids. Riprap shall be placed to its full course thickness in one operation and in such manner as to avoid damaged to the geotextile filter material. The finished riprap shall be free from objectionable pockets of small stones and clusters of larger stones. Placing riprap in layers will not be permitted.

The desired distribution of the various sizes of stones throughout the mass shall be obtained by selective loading of the material at the quarry or other source, by controlled dumping of successive loads during final placing and placement. A one foot maximum drop height placement procedures are to be utilized for riprap stone to avoid displacing or damaging the underlying geotextile.

Dumping of stone at the top of slopes and rolling or pushing into place will not be permitted.

Manipulating or moving stone at any time prior to placement by means of dozers or other blade equipment will not be permitted. Rearranging of individual stones by mechanical equipment or by hand will be required to the extent necessary to obtain a reasonably well graded distribution of stone sizes.

4. Frozen Materials.

4.1 No material shall be placed that contains frozen clumps of soil, snow or ice and shall not be placed on foundations that contain frozen material. This prohibition encompasses all foundation types, including the natural ground; all prepared subgrades, whether in an excavation or on an embankment, and all layers of previously placed and compacted earth fill which becomes the foundation for successive layers of earth fill. All material that freezes or has been subjected to freeze-thaw action during the construction work, or during periods of temporary shutdowns, such

SOW Page 3 Am0001 as, but not limited to nights, holidays, weekends, or winter shutdowns of earthwork operations, shall be removed to a depth that is acceptable to the COR and replaced with new material.

Alternatively, the material shall be thawed, dried, reworked and recompacted to the specified cease due to cold weather.

5. Placement.

5.1 Sand Fill and Topsoil Placement – Sand fill and topsoil shall be placed to the lines and grades shown on the drawings. Satisfactory sand fill and topsoil materials shall be placed and spread in layers not more than 12 inches in uncompacted thickness. Sand fill placement for Area 8 will be placed in the wet.

5.2 Control - Vertical and horizontal control to be utilized for placement of the topsoil is identified on the drawings.

6. Compaction

6.1 Moisture Control - Even though compaction densities are not required, the Contractor shall visually determine that optimum compaction is being accomplished by adding moisture, when necessary. Cohesive materials shall be placed in a moist state and cohesionless materials in a near saturated state to optimize compaction.

6.2 Topsoil – Topsoil material shall be compacted with one complete pass per lift, of appropriate compaction equipment as approved by the COR. Specific compaction densities are not required for topsoil. Top soil shall be blended into the existing slope after completion of clearing and grubbing activities.

6.3 Sand Fill - Sand fill materials shall be compacted with three complete passes per lift once fill material is above the water surface elevation approximately 1-foot, of appropriate compaction equipment as approved by the COR. Specific compaction densities are not required for sand fill material.

7. Seeding

7.1 Seeding (Areas 4 and 7 only) - Seeding of all constructed and disturbed surfaces shall be in accordance with Specification 32 92 19, SEEDING.

8. Permitting It will be the responsibility of the Contractor to pursue, acquire, and ensure the appropriate permits from the state and federal agencies are in place prior to construction activities. NPDES Permit is the responsibility of the Contractor. Other coordination for other environmental laws, including ESA, FWCA and wetlands will be the responsibility of the Contractor.

9. Safety

The Contractor shall be responsible for site safety of Contractor and subcontractor employees and any visitors to the work area. The Contractor shall supply the required safety equipment and shall

SOW Page 4 Am0001 ensure that all Contractor employees and subcontractor employees are properly equipped and trained in all safety procedures and precautions.

An Accident Prevention Plan (APP) shall be developed, maintained on-site during fieldwork, and shall be available for review at any time during the period of performance. As outlined in Section

14.1 Work Plan, an abbreviated APP shall be submitted as part of the Work Plan.

At a minimum, all work shall be conducted in accordance with OSHA requirements and the requirements in EM 385-1-1, (USACE, 2008; Errata 1-2010; Changes 1-3 2010; Changes 4-6 2011).

This safety manual is available at the following internet site:

http://publications.usace.army.mil/publications/eng-manuals/EM_385-1-1_languages/EM_385-1- 1_English_2008/toc.html. All other applicable local, state, and federal rules and requirements shall be adhered to.

10. Surveys

A licensed surveyor shall complete the engineering survey of the project site. Pre and post surveys are required such that grading plans can be developed and quantities of materials can be estimated of in place material. Survey data shall be of sufficient quantity and at a suitable scale for mapping with 1-foot contours.

The horizontal control datum for the engineering survey shall be NAD 83, North Dakota State Plane Coordinate System, South Zone. The vertical control datum for the survey shall be NAVD 88. Survey control should be maintained from offsite reference monuments located in stable material outside of the limits of influence from the construction and removed from the parameters being monitored.

Existing survey monuments are available and shown on the drawings for proper tie in.

11. Site Restoration

The project site and any staging areas, access roads, haul roads, or other areas disturbed by construction activity shall be restored to original conditions after completion of work to include removing excess materials, equipment and repairing any rutting or other damages and seeding disturbed areas. Any damages to the project shall be repaired by the Contractor at no additional cost to the Government.

12. Submittals

The following shall be submitted for Government approval.

The Contractor must submit a complete set of as-built drawings and associated CADD files representing the actual as-built conditions of the completed construction. See Section 01 78 39.00 24, AS-BUILT DRAWINGS for requirements.

12.1 Work Plan

The Contractor shall develop and submit a Work Plan that details the Contractor’s plan for executing this SOW to include procedures for completing tasks and gathering relevant data. Fieldwork shall not commence until the Corps of Engineers reviews and approves the Work Plan.

At a minimum and as applicable to task(s), the following information will be provided in the Work Plan.

Project Summary

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Project Management Baseline Project Schedule Abbreviated Accident Prevention Plan including AHA o The Contractor shall submit for acceptance a written abbreviated APP including an Activity Hazard Analysis (AHA) as part of the Work Plan. The APP and AHA shall be in accordance with the criteria described in EM 385-1-1, Appendix A, with reference to this manual in the

APP (USACE, 2008).

Quality Control/Quality Assurance Plan Procedures o Placing Topsoil o Berm Construction of Area 8 o Riprap Placement o Proposed Ramp Location, Construction Materials and Method

Surveys Staking and Utility Clearances Points of Contact

Attachment to Section 01 30 00.24 Am0001

Appendix A

Name: Lake WaConDa 2011 Levee Repairs Location: Lake WaConDa, Cass County, NE Sol. No.: W9128F-13-B-0002 P.M.: Andrew Winslow Ext. 2767

Contractor shall reproduce multiple hardcopy sets of contract drawings from government provided CD Rom. Drawings shall be forwarded to addresses listed below.

Address Full Size Half Size

Nebraska Resident Office 2 3 U.S. Army Corps of Engineers P.O. Box 13287 Offutt AFB, NE 68113

(For Fed-Ex or UPS use:

Bldg 525, Castle Hall, 3rd Floor Offutt AFB, NE 68113)

U.S. Army Corps of Engineers Attn: CENWO- PM-S (PM:Winslow) 1616 Capitol Ave Omaha, Nebraska 68102 7

Sanitary & Improvement District No. 1 of Cass County, NE 4 10250 Regency Circle Omaha, NE 68114

Total 2 Full 14 Half