Am 0001.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 09 B 0012 :all amendments may cause rejec- :

:tion of the bid. See FAR : Date of Issue: 04 May 2009 :52.214-3 of Section 00100 : Date of Opening: 04 Jun 2009

Amendment No. 0001 14 May 2009

SUBJECT: Amendment No. 0001 to Specifications and Drawings for Construction of Additional Pumping Capability, Williston Pumping Plant, Williston, North Dakota Solicitation No. W9128F 09 B 0012.

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) Section 15131A Page 5, paragraph 1.2.2 Capacities, delete subparagraph a. and substitute The following:

"a. Discharge not less than 30,000 gal/min against total head corresponding to a static head of 38 feet with water surface in sump at Elevation 1834 feet. This function will be performed by each of the three (3) pumps for a total of 90,000 gallons per minute."

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

-- 02245 Stone (Riprap) Protection

c. Drawings (Reissued). The following drawing sheets are revised with latest revision date of 14 May 2009, and reissued with this amendment.

(1) Sheets C-102, C-201, C-401, S-101, M-102 and M-201.

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

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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 00010-1 of Standard Form 1442.

3. Bids will be received until 2:00 p.m., local time at place of bid opening, 04 Jun 2009.

Attachments:

Spec Pages listed in 1.b. above Dwgs. listed in 1.c. above

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

14 May 2009

MFS/4411

Additional Pumping Capacity, Williston, ND ND08

SECTION TABLE OF CONTENTS

DIVISION 02 - SITE CONSTRUCTION

SECTION 02245

STONE (RIPRAP) PROTECTION

PART 1 GENERAL

1.1 SUMMARY

1.2 REFERENCES

1.3 SUBMITTALS

1.4 SAMPLING AND TESTING

1.3.1 General Requirements (Riprap)

1.3.2

1.4.3 Initial Sampling and Testing Requirements

1.3.3 Bulk Specific Gravity

1.3.4 Soundness in Magnesium Sulfate

1.4.3.3 Freeze-Thaw Testing for Riprap

PART 2 PRODUCTS

2.1 STONE PROTECTION MATERIALS

2.1.1 Riprap

2.1.2 2.1.2 Bedding Material

PART 3 EXECUTION

3.1 General

3.2 Placement

3.2.1 Bedding

3.2.2 Riprap

3.2.3 Field Gradations

3.2.3.1 General

3.2.3.2 Riprap

3.2.4 Protection

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SECTION 02245 Page 1 Am #0001

SECTION 02245

STONE (RIPRAP) PROTECTION

PART 1 GENERAL

1.1 SUMMARY

The work covered by this section consists of furnishing all plant, labor, equipment and materials, and performing all operations in connection with furnishing and stockpiling or construction of stone protetion (Riprap and Bedding) in accordance with these specifications and as indicated on the drawings. The Contractor shall control operations during production of stone protection material so as to ensure that the material delivered and placed will meet all specification requirements. The Contractor shall perform all sampling and testing required for quality control in accordance with the provisions of this section. The quarry operators shall be responsible for operating all quarries and for conditioning the area after operations are complete, in accordance with all applicable Federal, State, and local laws and regulations.

1.2 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by basic designation only.

AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)

ASTM C 88 (1990) Soundness of Aggregates by Use of Sodium Sulfate or Magnesium Sulfate

ASTM C 127 (1993) Specific Gravity and Absorption of Coarse Aggregate

ASTM D 5519 (1994) Particle Size Analysis of Natural and Man-Made Riprap Material

ASTM D 75 (2003) Sampling Aggregates

1.3 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. The following shall be submitted in accordance with Section 01330 SUBMITTAL PROCEDURES:

SD-06 Test Reports

Test Results; G-AO

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Field Gradation Test Results mailed within ten (10) days after completion of the tests.

SD-07 Certificates

Certified Weight Scale Tickets; G-AO

Submit a copy of each certified weight scale ticket.

SD-03 Product Data

Stone Protection; G-AO

Initial tests, source, legal description, Geologic Record and Service Record for stone protection and Production gradations (Bedding and Riprap).

1.4 SAMPLING AND TESTING

1.3.1 General Requirements (Riprap)

The Contractor shall be responsible for all sampling and testing specified herein. The Government may perform verification tests as determined necessary for final approval of the stone protection material (riprap).

All samples including samples taken during production shall be representative of the stone protection material furnished or proposed to be furnished. Samples shall be taken in accordance with ASTM D 75 or other approved method. All sampling operations shall take place in the presence of the Contracting Officer or a representative of the Contracting Officer.

At the same time samples for initial tests are obtained, the ledge or ledges in quarries sampled shall be marked with an approved semi-permanent marking which will be readily visible during the period of riprap production. No rock shall be furnished from any ledge that has not been sampled, tested, and approved for use on this project. The Contracting Officer has the option to select samples from stockpiles at the production facility (quarry) or at the construction site. Initial Quality tests are not required on field stone obtained from an approved source

1.3.2 Test Results

Results shall verify that materials (riprap) comply with this specification. When a material source is changed, the new material shall be tested for compliance. When deficiencies are found, the initial analysis shall be repeated and the material already placed shall be retested to determine the extent of unacceptable material. All in-place unacceptable material shall be replaced or modified as directed by the Contracting Officer.

1.4.3 Initial Sampling and Testing Requirements

Tests for bulk specific gravity, soundness in magnesium sulfate, and soundness in freezing and thawing shall be performed on samples of material obtained from each ledge proposed for use as stone protection prior to start of construction. Test results shall describe type of failure of the discrete particles. Certified test results performed not longer than 12 months prior to delivery to the project together with the name of the owner of the quarry and the legal description shall be submitted to the Contracting Officer. The Contractor shall submit the name and location of each quarry proposed for use along with a geologic section of each quarry

SECTION 02245 Page 3 indicating the various rock units identified by geologic name of formation and member and indicate from what ledge the samples were obtained.

1.3.3 Bulk Specific Gravity

Bulk specific gravity shall be computed in accordance with ASTM C 127 except that the total sample shall weigh 5000 grams +2 percent and individual particles shall weigh approximately 300 grams each. Stone protection material shall be tested in a saturated surface-dry (SSD) condition. The computed bulk specific gravity so determined shall not be less than 2.55.

1.3.4 Soundness in Magnesium Sulfate

Soundness in magnesium sulfate shall be determined according to ASTM C 88 with test modifications as listed below. The combined loss at 5 cycles shall be not more than 8 percent. The test report shall show the percentages of loss calculated as described herein and the number of pieces affected, classified as to number disintegrating, splitting, crumbling, cracking, flaking, etc.

a. Sample Preparation

The sample shall be prepared by breaking it into fragments reasonably uniform in size and shape and weighing approximately 100 grams each. The test sample shall weigh 5000 grams +/- 2 percent. The sample shall be thoroughly washed and dried previous to test as described for coarse aggregate.

b. Sample Immersion and Temperature

The sample immersed in the solution shall be maintained at a temperature of 80 degrees F +/- 2 degrees F for the immersion period.

c. Quantitative Examination

At the end of the fifth cycle, the percentage loss shall be determined by the three following methods. The test report shall show the loss computed by each method; however, only the combined loss shall be used for acceptance or rejection of the material.

1) Loss By Breaking

An individual piece which has broken or split into three or more fragments shall be considered to have failed the test, provided each of the three such fragments is at least 10 percent of the original piece by weight. The total original weight of all pieces failing the test, expressed as percentage of the total original weight of the sample, shall be considered as percentage loss by breaking.

2) Loss By Crumbling and Flaking

After the loss by breaking has been determined, the pieces that have not failed in that determination shall be screened on the 1/2-inch sieve and the material retained on the sieve shall be weighed for purposes required to determine combined losses. The pieces which have failed by breaking shall then be added to the material remaining on the 1/2-inch sieve and screened. The difference between the total original weight of the sample and the total weight of the material retained on the 12.5 mm sieve

SECTION 02245 Page 4 expressed as percentage of the total original weight, shall be considered as percentage loss by crumbling and flaking.

3) Combined Loss

The difference between the total original weight of the sample and the weight of the material retained on the 1/2-inch sieve, after screening the pieces which did not fail by breaking, expressed as percentage of the total original weight, shall be considered as percentage combined loss.

1.4.3.3 Freeze-Thaw Testing for Riprap

Testing of riprap shall be in accordance with Corps of Engineers CRD-C 144, Standard Test Method for Resistance of Rock to Freezing and Thawing. The maximum loss at 20 cycles shall not exceed 20 percent by weight.

PART 2 PRODUCTS

2.1 STONE PROTECTION MATERIALS

2.1.1 Riprap

All stone shall be durable angular fractured rock with a minimum of one flat surface as approved by the Contracting Officer's Representative.

Individual pieces of stone protection in-place shall be free from cracks, seams, and other defects that will cause rapid or excessive deterioration or degradation during service. The stone protection shall contain not more than 5 percent of unacceptable material by weight. Unacceptable material is defined as individual pieces of stone which do not meet the quality requirements and which can be visually differentiated from the satisfactory pieces, plus dirt, sand, clay, and rock fines. The riprap shall be free from thin slabby pieces having a maximum dimension more than four times the least dimension (elongation). Materials less than 1/2-inch maximum cross section, accumulated from handling operations shall not exceed 5 percent by weight. Stone for riprap shall be reasonably well graded from coarse to fine and fall within the gradation limits presented in Table 1.

TABLE 1. RIPRAP GRADATION

Percent Lighter Weight in Size in Approx.

by Weighy Pounds (lbs) Spherical Diameter(in) 100 170-465 15-21 50 70-140 11-14 15 17-70 7-11

2.1.2

2.1.2 Bedding Material

Bedding material shall be at least equal in quality to that of the Riprap and shall be well graded between the sixes specified. Bedding material shall be quarried stone, field stone, and crushed rock consisting of particles having at least one fractured face. The material shall be composed of tough, durable particles, shall be reasonably free from thin, flat and elongated peices and shall contain no organic matter nor soft, firable particles in quantities considered objectionable by the Contracting Officer.

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Table 2. BEDDING GRADATION

Sieve Designation Percentage by Weight Passsing Square Mesh Sieve 4" 90-100 2" 45-75 1" 15-40 #4 0-10

PART 3 EXECUTION

3.1 General

Operations shall be controlled to produce a reasonably well-graded stone of required size, and the Contracting Officer may require changes as necessary to produce the required product. The Subcontractor's operations shall be conducted in a manner that will produce stone meeting the requirements specified and shall include selective handling and loading as required.

Materials composed of the specified gradation and properties shall be placed on the prepared subgrade where indicated on the drawings. Riprap placement shall follow placement of the bedding material.

3.2 Placement

3.2.1 Bedding

Bedding material shall be spread uniformly to the slope lines, thickness, and grade indicated on the drawings or as directed. Placing of material by methods which will tend to segregate particle sizes within the bedding will not be permitted. Any damage to the surface of the bedding foundation during placing of the bedding shall be repaired before proceeding with the work. Compaction of the bedding material will no be required but it shall be finished to present a reasonably even surface free from depressions, mounds, or windrows.

3.2.2 Riprap

Riprap shall be placed on the separation geotextile within the limits shown on the drawings or as directed by the Contracting Officer. Riprap shall be placed in such 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 damage to the geotextile and to minimize segregation of the riprap.

The larger stones shall be well distributed and the entire mass of stones in their final position shall be roughly graded to conform to the gradation specified. 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. Zero 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

SECTION 02245 Page 6 reasonably well graded distribution of stone sizes as specified above.

3.2.3 Field Gradations

3.2.3.1 General

If the material fails to meet the gradation limits specified, the Contractor shall discontinue placement of the material and adjust his operations or he shall propose another source. The Contractor shall verify with the necessary additional tests that acceptable materials are being produced. Tests which do not pass the gradation requirements will not be counted in the additional required tests above. All field tests will be performed by the Contractor at their own expense.

3.2.3.2 Riprap

The COR may direct the Contractor to perform a field gradation test of riprap material determine if the material as delivered to the job meets the gradation requirements of this specification. A sample consisting of 4 to 8 tons shall be taken of material delivered to the job and checked for gradation and elongation. The material from the initial test that meets specifications shall be placed in a well marked area as designated by the Contracting Officer or authorized representative to serve as a visual model for acceptable material. Material that does not meet specifications shall not be counted as a required test. The Contractor shall state in writing the method used in blasting, processing, loading, and handling this sample, and shall notify the Contracting Officer or authorized representative any time any production methods are changed. Riprap material shall not be placed until the material delivered to the job has passed a field gradation test. At the discretion of the Contracting Officer or authorized representative, random loads will be dumped or the in-place material will be sampled and a gradation control check shall be performed by the Contractor at the discretion and under the supervision of the Contracting Officer.

3.2.4 Protection

The Contractor shall maintain the riprap stone until accepted by the Contracting Officer and any material displaced by any cause shall be replaced at the expense of the Contractor to the lines and grades shown on the drawings.

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