1. GENERAL.
1.1 SCOPE. The Contractor shall provide all plant labor and material necessary to furnish and deliver a
minimum of 650 tons and up to 1,100 tons of bedding material and a minimum of 1,400 tons and up to
2,100 tons of riprap to Winnibigoshish Dam located on the right bank (when looking downstream) of the
Upper Mississippi River approximately 15 miles west of Deer River, Minnesota.
1.2 APPLICABLE PUBLICATIONS. The publications listed below form a part of this scope of work to the extent
referenced. The publications are referred to in the text by basic designation only.
U.S. Army Corps of Engineers, Engineer Manual (EM).
EM 385-1-1 Safety and Health Requirements Manual, (15 March 2024).
ASTM International (ASTM).
ASTM C 33/C 33M Standard Specification for Concrete Aggregates (2008)
ASTM C 136 Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates (2006)
ASTM D 75/D75 M Standard Practice for Sampling Aggregates (2009)
ASTM D 4791 Flat Particles, Elongated Particles, or Flat and Elongated Particles in Coarse
Aggregate (2005e1)
1.3 SUBMITTALS
1.3.1 General. The Contractor shall submit the following as required. Approval of submittals will not relieve
the Contractor of responsibility to furnish materials as required. In order to make the submittal
process as efficient as possible, the Contracting Officer may give verbal responses to a submittal
followed by the written response at a later date. In this case, the submittal response date will be the
date that the verbal response was given.
a. Submittal Control Document (ENG Form 4288-R) as specified in PARAGRPAH 1.3.3 Submittal
Control
b. Material Source as specified in PARAGRAPH: 2.2 Sources and Evaluation
c. Method of Processing Riprap as specified in PARAGRAPH: 2.1.6 Riprap and Bedding Gradation
Processing
d. Gradation Test Results as specified in PARAGRAPHS: 2.4 Riprap Gradation Testing and 2.5
Bedding Gradation Testing
e. Plan Indicating location and schedule of Weighing Operations as specified in PARAGRAPH:
1.4.1.1.1 Measurement
f. Delivery Tickets as specified in PARAGRAPH: 1.4.1.1 Weighing Operations
g. Scale Accuracy Certification as specified in PARAGRAPH: 1.4.1 Measurement
h. Daily Delivery Report as specified in PARAGRAPH: 1.4.1.1 Weighing Operations
i. Pre-Delivery Site Survey as specified in PARAGRAPH: 3.7 Protection of Government Buildings,
Equipment, Facilities, and Vegetation.
1.3.2 Submission of Submittals. Submittals shall be submitted to the Contracting Officer in ample time to
secure approval prior to the time the items covered are to be delivered to the site. ENG Form 4025
(Attachment 5) shall be used for the transmittal of submittals. One electronic copy of all submittals
shall be provided. Hard copies of submittals are generally not required unless specifically noted. The
Government shall be provided at least three working days to review a submittal unless specified
otherwise.
1.3.3 Submittal Control. Within 7 calendar days after contract award date, the Contractor shall submit to
the Contracting Officer for review and approval, a submittal control document (ENG Form 4288-R) in
electronic format listing and scheduling all items required to be furnished for review by the
Government. A blank submittal register is included in Attachment 3. Primary responsibility for
submittals shall rest with the Contractor. The Contractor shall furnish submittals for all deviations
from the specifications.
1.4 MEASUREMENT AND PAYMENT.
1.4.1 Measurement. Riprap shall be weighed on an accurate, approved scale furnished or made available
by the Contractor. Before being approved for use, the scale shall have been tested by the applicable
State’s Department of Weights and Measures or by a reliable scale servicing company so as to
operate within a degree of error not greater than 1 percent and to be sensitive to a change in load of
1/5 of 1 percent, both percentages being based on the total required weight of material normally
weighed as a unit on the scale. The Contractor shall submit the certification document from the
appropriate state’s Department of Weights and Measures or scale servicing company that the
proposed scale complies with the requirements listed above. Scales shall be spot checked for
accuracy and sensitivity as often as directed by the Contracting Officer during stone delivery. When
materials are weighed in hauling vehicles, gross weights shall be checked and the vehicle tare weight
determined as often as the Contracting Officer directs. The Contractor shall furnish such weights,
accessories, and assistance as the Contracting Officer may require for conducting weighing
equipment tests.
1.4.1.1 Weighing Operations. Weighing operations shall be performed, as approved, in the presence of the
Contracting Officer, unless waived. Each load shall be accompanied by duplicate copies of delivery
tickets certified by the weighmaster. As a minimum, each ticket shall contain the following
information:
a. Date and Time.
b. Vehicle Number.
c. Gross Weight.
d. Vehicle Tare Weight.
e. Net Weight of Riprap.
f. Material weighed (Description of Load Contents).
g. Signature of Weighmaster.
The Government will collect a copy of the delivery ticket from each truck as it arrives on site.
The Contractor shall submit a daily report detailing the number of trucks that made deliveries to the
site as well as an overall quantity of material delivered to the site that day. All daily reports shall be
submitted no later than 24 hours after the report period end date and time.
1.4.1.1.1 A plan indicating the location and proposed schedule of weighing operations shall be submitted
for approval in accordance with PARAGRAPH: 1.3 Submittals.
1.4.2 Payment. Riprap and bedding material shall be measured and paid for by the net ton (2,000 pounds
avoirdupois) of acceptable material delivered as specified to the designated delivery site.
1.5 LIST OF ATTACHMENTS:
1 – USGS Little Winnibigoshish Lake MN 7.5 Minute Quadrangle Sheet
2 –Approved Material Sources
3 – Blank Submittal Register (ENG Form 4288-R)
4 – Gradation Forms:
Riprap Gradation Curve
Bedding Gradation Curve
Riprap Gradation Analysis Worksheet, Method A
Riprap Gradation Analysis Worksheet, Method B
5 – Blank Submittal Transmittal Form (ENG Form 4025)
6 – Sample Submittal Register
2. PRODUCTS.
2.1 MATERIALS.
2.1.1 General. Riprap and bedding material shall be tough and durable stone of suitable quality to ensure
permanence in the Upper Mississippi River environment. Stone shall be free from cracks, seams and
other defects that would unduly increase its deterioration from natural causes. A crack is considered
to be detrimental if it is more than four (4) mils wide and is continuous for one-third the dimension of
at least two sides of the stone. Materials shall be adequately free from thin, flat and elongated
pieces, and shall contain no organic matter nor soft, friable particles in quantities considered
objectionable by the Contracting Officer. The bedding aggregates shall meet the quality
requirements of ASTM C33/C33M.
2.1.2 Specific Gravity. All Stone shall have a specific gravity of not less than 2.65.
2.1.3 Riprap and Bedding Shape. The maximum aspect ratio (greatest dimension: least dimension) of any
piece of stone for size ranges shall not be greater than 3:1 when measured across mutually
perpendicular axis. ASTM D4791 shall be used as a guide to perform the test.
2.1.4 Riprap Gradation. Riprap shall be reasonably well graded within the specified limits shown on the
riprap gradation curve, ENG Form 4055, contained in the Attachment 4. Inclusion of objectionable
quantities of dirt, sand, clay, rock fines, or other deleterious materials will not be allowed or
measured for payment.
2.1.5 Bedding Gradation. Bedding shall be well graded between the limits shown on bedding gradation,
ENG Form 2087, in the Attachment 4. Inclusion of objectionable quantities of dirt, sand, clay, rock
fines, or other deleterious materials will not be allowed or measured for payment.
2.1.6 Riprap and Bedding Gradation Processing. On the same date the Contractor provides the submittal
for material sources, the Contractor shall also submit for approval the method of processing materials
at the quarry that will preclude the inclusion of objectionable amounts of fine material and organic
matter. All materials shall be processed in accordance with the approved method. Quarry-run riprap
material will not be accepted. All rock designated for use as riprap shall be processed over a vibratory
grizzly or by an approved method to ensure the exclusion of poor quality rock.
2.2 SOURCES AND EVALUATION.
2.2.1 Contractor shall identify proposed material sources with the proposal information.
2.2.2 Approved material sources are provided in Attachment 2. The Contractor may elect to furnish rock
from another source(s) not listed in Attachment 2, provided the source is approved by the
Contracting Officer and meets the conditions hereinafter stated. If the Contractor proposes to furnish
materials from a source not listed, the Government Geologist will make such investigations and
evaluations as necessary to determine whether or not materials meeting the requirements of this
contract can be produced from the proposed source. The Contractor shall be responsible for making
its own investigations for sources of suitable materials and for making its own arrangements with the
owners of the quarries or land for procuring the required quantities of suitable materials.
2.2.2.1 Within 7 calendar days after award of the contract, the Contractor shall designate and submit for
approval only one source or combination of sources from which it proposes to furnish the materials
specified. If the Contractor proposes to furnish materials from a source or from sources not listed in
Attachment 2, it may designate only a single source or a single combination of sources from which to
furnish the material specified. Samples for acceptability testing shall be provided as required by the
PARAGRAPH: 2.3 Tests for Acceptability of Alternative Source Material. If a source for materials so
designated by the Contractor is not approved for use by the Contacting Officer, the Contractor shall
not submit for approval other sources but shall furnish the materials from approved sources selected
from the list in Attachment 2, at no additional cost to the Government.
2.2.2.2 Approval of a source of material is not to be construed as approval of all material from that source.
The right is reserved by the Government to reject materials from certain localized areas, zones,
strata, or channels when such material are unsuitable as determined by the Government Geologist.
Materials produced from an approved source shall meet all of the requirements of this specification.
2.3 TESTS FOR ACCEPTABILITY OF ALTERNATIVE SOURCE MATERIAL.
2.3.1 Quality tests and service records will be used to determine the acceptability of stone materials. In the
event suitable test reports and satisfactory service records are not available, as in the case of newly
operated sources, the materials will be tested to determine acceptability. Tests to which the
materials may be subjected to include petrographic analysis, specific gravity, soundness, abrasion,
absorption, freezing and thawing, and other tests considered necessary to demonstrate acceptability.
Tests will be made by, or under the supervision of, the Government and at the Government’s
expense.
2.4 RIPRAP GRADATION TESTING.
2.4.1 General Requirements. Gradation tests shall be performed by the methods and frequency listed
below. Testing listed herein shall be completed by and at the expense of the Contractor. Gradation
testing results, including failed tests, shall be submitted utilizing the gradation plots for the required
riprap gradation and the WORKSHEET FOR GRADATION ANALYSIS OF RIPRAP (gradation plots and
blank copies of the worksheet are included in the attachments section). The Contracting Officer shall
direct the time and location of sampling, unless waived. Samples will be taken from stockpiles or
loaded trucks, and not directly from conveyers or chutes. The Contracting Officer shall be informed a
minimum of 24 hours before each test is to be performed. The results of all tests, including failing
tests shall be submitted on the appropriate gradation plots and worksheets. The Contracting Officer
shall be informed immediately of test results and draft copies of test results shall be submitted at the
Contracting Officer’s request. Tests performed on material that does not meet gradation and shape
requirements will not be counted as part of the tests required.
2.4.2 Test Method A. Test method A shall consist of weighing all stones larger than 5 pounds in a sample.
Five to seven weight classes shall be selected within the range of stone sizes. Each stone shall be
weighed and recorded on the worksheet for method A. The weight of stones shall be summed for
each weight class; after which calculations and a plot of the gradation shall be completed in
accordance with accepted practice for soil and aggregate gradations.
2.4.3 Test Method B. Test method B shall consist of separating the stones into 5 to 7 piles, ordered by size.
The sample shall be separated on a clean, hard surface that is free of smaller stones that could
become mixed with the sample. The stones shall be visually screened to place them into appropriate
piles. All stones shall be separated and placed into a pile before weighing. After separating, the
smallest and the largest rock in each pile shall be weighed and recorded. The stones shall be adjusted
as necessary so that the weight classes do not overlap. After adjustment is adequate and weight
classes have been established, each pile of stone shall be weighed and recorded on the worksheet for
method B. Calculations and a plot of the gradation shall be completed in accordance with accepted
practice for soil and aggregate gradations.
2.4.4 Scales. Accuracy of scales shall be as required in PARAGRAPH: 1.4.1 Measurement.
2.4.5 Testing. A sample shall be obtained from each approved material source or combination of sources
for each gradation required and tested in accordance with either method A or B. A satisfactory test
shall be obtained from each source or combination of sources for each gradation prior to hauling any
riprap from that quarry. Each sample shall have a minimum gross weight of not less than 2,125 lbs.
2.4.6 Testing Frequency. Gradation tests will be required at a frequency of 1 per 1,000 tons of material
from a specific source that is brought on site, with a minimum of two gradation tests performed.
Tests that do not meet gradation requirements will not be counted.
2.4.7 Corrective Action. If materials fail to meet gradation or shape requirements, the Contractor shall
adjust its operations and verify with necessary tests that acceptable materials are being produced, or
it shall propose another source and verify, with necessary tests, that acceptable material can be
produced from that source.
2.5 BEDDING GRADATION TESTING
2.5.1 The bedding materials shall be sampled in accordance with ASTM D75/75M and tested in accordance
with ASTM C136/C136M.
2.5.2 Testing Frequency. At least 1 gradation test shall be performed per 500 tons of material from a
specific source that is brought on site, with a minimum of two gradation tests performed. Tests that
do not meet gradation requirements will not be counted.
2.5.3 Sample Size. Samples must have a minimum gross weight not less than 440 pounds.
3. EXECUTION.
3.1 SCHEDULE AND ORDERING. Delivery of riprap and bedding to the site shall commence on July 22, 2024
and shall continue on consecutive workdays until completed, unless directed otherwise by the
Contracting Officer. Deliveries prior to July 22, 2024 will need to be approved by the Contracting Officer.
The Contracting Officer will notify Contractor a minimum of 14 calendar days prior to commencing
delivery. The Contractor shall provide the riprap gradation submittals for approval no later than 5
calendar days prior to delivery of materials to the specified delivery location. The Contracting Officer may
temporarily suspend deliveries for up to five consecutive days. The Contracting Officer shall provide the
Contractor with at least 48 hours advance notice prior to temporarily suspending deliveries. The
Contracting Officer may temporarily suspend deliveries as many times as required during the Contract
Performance period. The delivery hours shall be between the hours of 7:30 a.m. and 5:00 p.m. (local
time), Monday through Thursday with the potential for deliveries on Friday, Saturday, and Sunday, unless
directed otherwise by the Contracting Officer. No deliveries shall be made on Federal holidays.
3.2 COORDINATION. The Contractor shall not block access routes for extended periods of time and shall
coordinate delivery access routes with the following:
Kip Baures
Marine Mechanic
507.429.1116 (mobile)
Kipp.M.Baures@usace.army.mil
Kurt Schroeder
Engineering Technician
651.212.3908 (office)
507.312.5258 (mobile)
Kurt.B.Schroeder@usace.army.mil
3.3 DELIVERY LOCATION. All riprap and bedding required under this contract shall be delivered to the
downstream embankment toe via an access road from Great River Road. Winnibigoshish Dam is located
on the right descending bank of the Mississippi River in Cass County, Minnesota approximately 15 miles
west of Deer River, Minnesota. The Winnibigoshish Dam is located on the USGS Little Winnibigoshish Lake
7.5 Minute Quadrangle. This 7.5 minute quadrangle sheet is included as Attachment 1. The access road is
further specified as the following latitude and longitude:
Latitude: 47.427339◦, Longitude: -94.054320◦
3.4 DELIVERY. Delivery of materials by the Contractor shall include placing material directly from the delivery
trucks into a stockpile area on site.
3.4.1 Loading Materials. Delivery trucks used by the Contractor for loading riprap and bedding onto
stockpiles shall be straight tandem, tri, or quad axle dump trucks with maximum 18 ton capacity. If
the maximum capacity of a straight tandem, tri, or quad axle dump truck is greater than 18 tons, it
may only be loaded with up to a maximum of 18 tons of cargo. The use of articulated end-dump
trailers, side dump, or belly dump trailers will not be allowed. The Contracting Officer reserves the
right to reject delivery from any truck that cannot safely discharge its cargo at the point of delivery.
3.4.2 Delivery Rate. The material delivery rate will vary between 18 tons and 800 tons per day, as
requested by the Contracting Officer’s Representative. It is anticipated that the bedding material will
be delivered first and the riprap will be delivered after completing delivery of the bedding material.
The Contractor shall be required to increase or decrease the delivery rate within the above stated
delivery rate range on a daily basis until the required quantity of material is met.
3.5 QUALITY CONTROL. The Contractor shall establish and maintain quality control and shall maintain records
of the quality control for work under this section to ensure compliance with contract requirements. A
copy of inspections and tests, as well as corrective actions taken, shall be furnished to the Government.
3.6 SAFETY. The Contractor shall comply with all state and Federal OSHA requirements as well as all pertinent
provisions of the latest version of the U.S. Army Corps of Engineers Safety and Health Requirements
Manual, EM 385-1-1. If a conflict exists between the guidance provided between the sources listed above,
the Contractor shall follow the most stringent standard given. A current copy of EM 385-1-1 can be found
at https://www.publications.usace.army.mil/Portals/76/Publications/EngineerManuals/EM_385-1-1.pdf
3.7 PROTECTION OF GOVERNMENT BUILDINGS, EQUIPMENT, FACILITIES, AND VEGETATION. The Contractor
shall use reasonable care to avoid damaging existing structures, equipment, and vegetation on the
Government site. The Contractor shall submit a pre-delivery site survey providing photographic
documentation of the roads and streets to be used for delivery on the Winnibigoshish embankment
facility to include access roads for Government Approval prior to commencing any rock deliveries. The
photographs shall be full color submitted in a .pdf format. The survey shall contain as a minimum a title
cover page, a short narrative stating the names of the persons who took the photos, the date the photos
were taken, any items of pre-existing damage, and each photo shall contain a descriptive caption. The
Contractor shall take enough photos of the site to adequately document the pre-delivery condition of all
access roads, and parking lots. If the Contractor’s failure to use reasonable care causes damage to any of
this property, the Contractor shall replace or repair the damage at no expense to the Government as the
Contracting Officer directs. If the Contractor fails or refuses to make such repair or replacement, the
Contractor shall be liable for the cost, which may be deducted from the contract price.
