Amendment 0001 Summary of Changes to Specifications.pdf

Amendment No. 0001 Solicitation No. W911XK20R0003 New Soo Lock - Upstream Approach Wall, Sault Ste. Marie, MI

CHANGES TO THE SPECIFICATIONS

1. SECTION 01 50 00 TEMPORARY CONSTRUCTION FACILITIES AND CONTROLS

Delete paragraph 3.2 TEMPORARY MOBILE OFFICE Add paragraph 3.2 TEMPORARY MOBILE OFFICE “The contractor shall supply a temporary mobile office to house approximately (6) Corps of Engineers employees for the duration of the contract period. This building will house USACE employees only and shall be physically and acoustically separated from the Contractor's offices. The mobile office will have cleaning and janitorial services provided by the contractor. A trailer will be on site and the contractor will need to coordinate with Phase 1 contractor for possible purchase of the trailer. Only one trailer should be on site at a given time.

The temporary mobile office must be installed and ready to move in no later than 1 May, 2021.

Temporary Mobile Office Requirements:

The mobile office must have one (1) restroom and six (6) L-shaped cubicles for employees. The mobile office must be suitable in size (700 square feet minimum) for 6 full-time employees to comfortably work. The office shall be furnished with office furniture with minimum dimensions of 6x6 for six (6) occupants. Maximum occupancy will be ten (10) occupants. The mobile office shall be securely anchored to the ground at all four corners to guard against movement during high winds. The office shall be securely anchored to the ground per EM 385-1-1.

The office shall be provided with no less than two (2) entrances. Each entrance shall have a set of stairs including a landing and handrails, preferably made of aluminum. An ADA compliant ramp must be installed at a minimum of one entrance. Each door shall be provided with deadbolts, keyed alike, with two (2) sets of keys. The office shall include office furniture consisting of a cubicle area to include chairs as well. Each enclosed office (if provided) must have a door that locks with two (2) sets of keys. The cubicle area shall have a minimum of four (4) windows. The mobile office shall be provided with adequate heating and cooling to maintain a temperature of approximately 70 (+/- 5) degrees F throughout the calendar year. The relative humidity must be between 30-50% inside during all seasons. Battery powered smoke detectors shall be provided. Data wiring shall be provided for connection capabilities to wireless internet.

Provide the following furniture in the Offices:

A minimum of four (4) file drawers is required in each desk either as part of the desk or as a separate file cabinet. The file cabinets are to be 42" wide, 18" deep, and 28" high, ball bearing guides, lockable, letter & legal size capable with safety interlock to prevent more than one drawer from being open at a time. Each cubicle must have a privacy divider that contains upper cabinets and a cork/fabric board to separate one work station from another.

Provide the following furniture partitions for the open office area:

A table suitably sized to review full size project drawings. Allow space for and provide a project drawing rack next to the table. A table suitably sized for two network printers,

(6) work desks (cubicle style with dividers) and (6) chairs, (2) bookcases, and (4) guest chairs.

Fluorescent or LED lighting shall be provided throughout the complex sufficient enough to provide lighting intensity appropriate for office occupancy (30 foot candles minimum). The restroom shall be provided complete with connections to water and sanitary septic tank. The septic tank will be pumped by others. A backflow preventer shall be installed on the main water line servicing the temporary facility.

The electric service to the mobile office shall be 120V/240V with size and rating of the distribution panel(s) as recommended by the supplier based on the size of the complex and the equipment to be installed. Each communication outlet shall consist of two RJ45 jacks. Telephone service will consist of seven (7) dedicated voice lines and two (2) lines for fax/modem. The service shall terminate at a 25 pair punch-down block mounted on a plywood board. All voice cables shall have a minimum rating of CAT 6. Electrical power outlets shall be installed throughout the office in accordance with the latest edition of the National Electrical Code. Each individual cubicle location shall be provided with electrical, data, and telephone outlets. Each enclosed office shall have electrical, data, and telephone outlets located near each desk. All other spare rooms (if included) shall have proper power outlets that are appropriately spaced based on code regulations.

Trenching will be required to connect the temporary building to power supply.

All utilities as specified or required shall be hooked up and in working order prior to turning over the temporary mobile office to the government. The entire cost to the Contractor for furnishing, equipping and installing the accommodations shall be included in the contract price. If the Contractor fails to meet these requirements, the facilities will be secured by the Contracting Officer and the cost thereof will be deducted from payments to the Contractor. All facilities provided for the use of Government personnel under this paragraph shall remain the property of the Contractor or its subcontractors.

Shop drawings of the temporary mobile office shall be submitted for Government review and approval prior to purchase/rental. Minor changes to the electrical and communication outlets may be necessary in order to coordinate with the furniture layout.

The location of the temporary mobile office will be near the contractor's on-site office (if used) or another area within the contractor's work limits will be designated. After the contract substantial completion, remove the entire structure from the site and restore the area to existing condition or better. All temporary utilities shall be removed and the site must be restored after the temporary mobile office is removed.”

2. SECTION 01 99 00 LISTING OF ENCLOSED DOCUMENTS, EXHIBITS AND OTHER

ATTACHMENTS

Delete paragraph 1.1 ENCLOSURES Add revised paragraph 1.1 ENCLOSURES “This Section contains documents referenced in other Sections of the specifications.

They are consolidated in this Section for the convenience of the Contractor and the Government. The Contractor may reproduce the enclosed forms for its use or obtain a supply of the forms from the Contracting Officer.

TITLE

CONSTRUCTION PROJECT AND SAFETY PERFORMANCE SIGNS

SUBSURFACE INVESTIGATION DATA

BEDROCK PROFILES FOR DRILLED SHAFT CONSTRUCTION:

DC-33-01

DR-2-1

DETAILS OF ELECTRICAL CONDUIT SYSTEM:

DC-61-78

DC-61-80

DC-61-82

DC-61-84

DC-61-86

DC-61-88

DC-61-28

DC-78-121

PICTURES OF POTENTIAL HAZARDOUS MATERIAL

CN RAILROAD BRIDGE DRAWINGS

IBA BRIDGE DRAWINGS

UNIT 10 SLUICEWAY BULKHEAD SLOT RECESS AS-BUILT DRAWING

UPSTREAM APPROACH WALL HISTORIC DRAWINGS

NORTH CANAL WALL SURVEY DATA

BASELINE VIBRATION DATA”

3. Section 02 41 16 DEMOLITION

Delete paragraph 3.4 SELECTIVE DEMOLITION, GENERAL Add paragraph 3.4 SELECTIVE DEMOLITION, GENERAL A. General: Demolish and remove existing construction only to the extent indicated on drawings. Demolition of existing construction shall not be permitted to be less than what is shown in the drawings. It shall be the responsibility of the contractor to make up any over-demolition with the required construction materials of the location in question. Use methods required to complete the Work within limitations of governing regulations and as follows:

1. Dispose of demolished items and materials promptly.

2. Use demolition methods and methods of protection least likely to result in damage to existing structures.

B. Existing Structure to Remain: Protect construction indicated to remain against damage during selective demolition.

C. All abatement work shall be performed in accordance with Federal, State, and Local regulation, if applicable. Specifically, the Occupational Safety and Health Administration (OSHA), the Environmental Protection Agency, and the State of Michigan applicable regulations on asbestos, lead, PCB, and regulated light bulbs. In addition, the Army Corps of Engineer (ACOE) applicable practices outline in EM 385- 1-1 as it relates to hazardous materials. Employee training and contractor hazard communications must comply with all OSHA and State of Michigan applicable regulations in addition to the ACOE requirements.

4. SECTION 03 31 01.00 10 CAST-IN-PLACE STRUCTURAL CONCRETE AND CONCRETE

REMOVAL

Add paragraph 3.2.5 Placing Concrete Underwater “Lake Superior Water levels have been higher than average in recent years this trend is likely to continue for the duration of this project. Concrete may be placed underwater but it must conform to the guidelines and recommendations of ACI 304R Chapter 8 - Concrete Placed Under Water. A specific concrete mixture for underwater placement must be developed for use in the placement. Concrete placed underwater shall extend above the water surface 6" plus or minus ¼". A maximum elevation of +2.5 for horizontal construction joint will be allowed. Joint surface shall be prepared in accordance with Above Water Joint Preparation of this specification. The methods and equipment used shall be submitted in advance of placement for review and approval by the Contracting Officer.”

Add paragraph 3.5.3 Above Water Joint Preparation “Horizontal concrete surfaces to which other concrete is to be bonded shall be prepared for receiving the next lift or adjacent concrete by cleaning by sandblasting, high-pressure water jet, or air-water cutting. A surface retarder and or a membrane forming curing compound will not be allowed to be used for surface preparation. Surface cutting by air-water jets will not be permitted for concrete surfaces congested with reinforcing steel or if they are relatively inaccessible. If, for any other reason, it is considered undesirable to disturb the surface of a lift before it has hardened, the use of sandblasting or high-pressure water jet after hardening will be required. Regardless of the method used, the resulting surface shall be free from all laitance and inferior concrete so that clean, well-bonded coarse aggregate particles are exposed uniformly over the lift surface up to a maximum 1/4 inch amplitude. Application of the joint treatment method shall be such that the edges of the larger particles of aggregate are not undercut. Where joint preparation occurs more than 2 days prior to placing the next lift or where the work in the area subsequent to the joint preparation causes dirt or debris to be deposited on the surface, the surface shall be cleaned as the last operation prior to placing the next lift. The surface of the construction joint shall be kept continuously wet for the first 12 hours of the 24 hours prior to placing concrete, except that the surface shall be damp with no free water at the time of placement.”

Add paragraph 3.5.3.1 Air-Water Cutting “Air-water cutting of a construction joint shall be performed at the proper time, generally between 4 and 12 hours after placement and only on horizontal construction joints. This period may be modified if a retarder is used to prolong the setting of the cement at surface of the concrete. The air pressure used in the jet shall be 90 to 110 psi, and the water pressure shall be just sufficient to bring the water into effective influence of the air pressure. When approved, a surface retarder complying with the requirements of COE CRD-C 94 may be applied to the surface of the lift to prolong the period of time during which air-water cutting is effective. After cutting, the surface shall be washed and rinsed until the wash water is no longer cloudy. If air-water cutting does not produce acceptable results, the surface shall be prepared by high-pressure water jet or sandblasting.”

Add paragraph 3.5.3.2 High Pressure Water Jet “A stream of water under a pressure of not less than 3,000 psi may be used for cleaning.

Its use shall be delayed until the concrete is sufficiently hard so that only the surface skin or mortar is removed and there is no undercutting of coarse-aggregate particles. If the high-pressure water jet is incapable of a satisfactory cleaning, the surface shall be cleaned by sandblasting.”

Add paragraph 3.5.4 Wet Sandblasting “This method of joint preparation may be used when the concrete has reached sufficient strength to prevent undercutting of coarse aggregate particles. The operation shall be continued until all accumulated laitance, coatings, stains, debris, and foreign materials are removed. The surface of the concrete shall then be washed thoroughly to remove all loose material. This method may be used on horizontal surfaces.”

5. Section 05 12 00 STRUCTURAL STEEL

Delete Paragraph 2.5 GALVANIZING Add Paragraph 2.5 GALVANIZING “ASTM F2329/F2329M, ASTM F1136/F1136M, ASTM F2833 or ASTM B695 for threaded parts.”

Delete paragraph 2.6.2 SHOP PRIMER

Delete paragraph 2.6.2.1 CLEANING

6. Section 05 50 04 MISCELLANEOUS, STANDARD ARTICLES, SHOP FABRICATED ITEMS

Delete paragraph 2.2.1.1 MATERIALS Add paragraph 2.2.1.1 MATERIALS “Guard railing shall be of pipe as specified in ASTM A 500 Gr B, nominal diameter as required and approved, hot-dipped galvanized. All other members and components shown in the drawings regarding the railing shall be hot-dipped galvanized.”

7. SECTION 31 00 00 EARTHWORK

Delete paragraph 3.2 SSP Wall Toe Trench Excavation Add paragraph 3.2 SSP Wall Toe Trench Excavation “The SSP wall toe trench shall be excavated within the limits shown on the construction drawings to achieve a trench in which to place the SSP transition walls. SSP wall toe trench excavation shall include excavating, removal, and disposal of overburden and sandstone bedrock at the channel bottom for the SSP trench. The Contractor will also be responsible for clearing the SSP drive line which shall include the satisfactory removal and disposal of obstructions such as boulders, bedded deposits, and unstratified masses, which cannot be removed without systematic drilling or grinding, and firmly cemented conglomerate deposits possessing the characteristics of solid rock impossible to remove without systematic drilling or grinding. The use of blasting for toe trench excavation is prohibited. Boulders shall be interpreted as pieces of rock of 1/2 cubic yard or more in volume.”

Delete paragraph 3.3 Cell Excavation Add revised paragraph 3.3 Excavation

“The SSP cell foundation shall be excavated within the limits shown on the construction drawings to achieve a surface of -30.5 feet below Low Water Datum with a +/- 6 inch tolerance for seating of the SSP panels. SSP cell excavation shall include excavating, removal, and disposal of all overburden and bedrock at the channel bottom where the SSP cell is to be placed. The use of blasting for cell excavation is prohibited.”

8. SECTION 31 10 00 DISPOSAL OF MATERIALS

Delete paragraph 3.1.3 Disposal of Concrete Rubble

Add paragraph 3.1.3 Disposal of Concrete Rubble Concrete rubble from the demolition of existing concrete structures shall be disposed of at the Government furnished disposal site, or at the Contractor's option, may be salvaged by the Contractor at a location off Government controlled or Government owned land. All exposed metal shall be removed from the concrete rubble prior to placement at the Government furnished disposal site. The Government may perform random observations of concrete rubble or truck loads of material. Based on the results of such observations, the Contractor may be required to remove any material they placed in the Government furnished placement area that is found to be in non-compliance with the exposed metal criteria. Such removal will be at the direction of the COR and will be at no additional cost to the Government. Metal shall be disposed offsite and at the Contractor's expense. Slopes shall not be steeper than 2H:1V. The top surface of the placement site shall be graded so that positive drainage towards the drainage ditch occurs.

9. SECTION 31 23 01.01 UNDERWATER BLASTING

Delete paragraph 3.7.5 Fish Spawn Add paragraph 3.7.5 Fish Spawn “Ensure that ground vibration stays below levels which could cause damage to fish eggs in the fish spawn area in the Unit 10 Tailrace during the fish spawning period. The fish spawning period is defined as 01 November thru 15 August. Keep ground vibration below 0.75 in/s at the nearest estimated fish spawn location at the Unit 10 Tailrace during the fish spawning period.”

10. SECTION 31 23 01.01 UNDERWATER BLASTING

Delete paragraph 3.7.9 Estimating Blast Vibrations Add paragraph 3.7.9 Estimating Blast Vibrations “Estimating Blast Vibration. Until enough data has been collected to perform a regression analysis, base the estimated vibration levels on the following equation:

Production and Buffer V=51(D/(W^0.5)^(-1.15)

Where:

V = peak particle velocity, in inches per second.

D = shortest distance between blast and the point of interest, in feet.

W = maximum weight of explosives per delay period of 8 milliseconds or less, in pounds

Limit the estimated vibration level to 50% of the safe vibration limit until a regression analysis has been performed for the blasting location. Multiple seismographs (minimum 5 units) can be placed at different distances on one blast to get preliminary data for a regression analysis.

All tests blasts should be designed to limit the estimated vibration levels to 50% of the safe vibration limit until it has been determined that vibration is not exceeding the prediction equations used.

After sufficient data has been gathered, use regression analysis to produce the 95 percent confidence site attenuation curves for the monitored structures. Design blasts using these curves to determine the maximum explosive charge weight per delay given the distance between structures and the blast. Continue to incorporate data from blasts into the site attenuation curves for use in future blast design.”

11. SECTION 31 41 16 METAL SHEET PILING

Delete the following to paragraph 1.2 SUBMITTALS “Inspection surveys of the piling trench shall be submitted to verify that the required trench depth, width and alignment were achieved prior to sheet pile installation.”

Add the following to paragraph 1.2 SUBMITTALS “Inspection surveys of the piling trench and ssp cell foundations shall be submitted to verify that the required trench depth, width, alignment, and cell excavation tolerances were achieved prior to sheet pile installation.”

Delete paragraph 2.1 METAL SHEET PILING Add paragraph 2.1 METAL SHEET PILING “Metal sheet piling shall conform to ASTM A 572/A 572M, Grade 50 and shall meet the tabulated requirements at the end of this paragraph. All piling shall be hot rolled. The interlocks of sheet piling shall be free-sliding, provide a swing angle suitable for the intended installation but not less than 5 degrees when interlocked, and maintain continuous interlocking when installed. Sheet piling shall be full-length sections of the dimensions shown on the drawings.”

Add paragraph 3.1.8 Inspection of SSP Cell Foundation The Contractor shall perform Inspection Surveys of the SSP Cell footprint to verify that the required tolerances were achieved for sheet pile placement. Additionally, surveys should show that the entire cell area is clear of any overburden and bedrock at the channel bottom where the SSP cell is to be placed. The Inspection Surveys shall be submitted to the COR for review prior to piling installation.

12. SECTION 35 31 19 STONE, CHANNEL, SHORELINE/COASTAL PROTECTION FOR

STRUCTURES

Delete paragraph 1.5 Construction Tolerances

Add paragraph 1.5 Construction Tolerances The finished surface and stone layer thickness shall not deviate from the lines and grades shown by more than the tolerances listed below. Tolerances are measured perpendicular to the indicated neatlines. Extreme limits of the tolerances given shall not be continuous in any direction for more than five times the nominal stone dimension nor for an area greater than 100 square feet of the structure surface.

NEATLINE TOLERANCES

MATERIAL ABOVE NEATLINE (inches) BELOW NEATLINE (inches) Core/Bedding 3 1.5 Underlayer/Riprap 6 12 Armor 10 20

The intention is that the work shall be built generally to the required elevations, slope and grade and that the outer surfaces shall be even and present a neat appearance.

Placed material not meeting these limits shall be removed or reworked as directed by the Contracting Officer. Payment will not be made for excess material which the Contracting Officer permits to remain in place.”

Delete paragraph 2.1.4 Armor Stone

Add paragraph 2.1.4 Armor Stone The stones furnished for armor stone shall weigh between 8,000 pounds and 20,000 pounds each, and shall be free of fines. Seventy-five percent (75 percent) of the stones shall weigh greater than 11,000 pounds each.

CHANGES TO THE PLANS

1. Delete Sheet SS115 Add revised Sheet SS115 (ATTACHED)

2. Delete Sheet SS301C Add revised Sheet SS301C (ATTACHED)

3. Delete Sheet SS303 Add revised Sheet SS303 (ATTACHED)

4. Delete Sheet SS509 Add revised Sheet SS509 (ATTACHED)

5. Delete Sheet SS500D Add revised Sheet SS500D (ATTACHED)

END OF AMENDMENT