SF30Amend0002.pdf

W81LJ890338765

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER (Type or print)

30-105-04EXCEPTION TO SF 30

APPROVED BY OIRM 11-84

STANDARD FORM 30 (Rev. 10-83) Prescribed by GSA

FAR (48 CFR) 53.243

SOLICITATION NO. W912HN-09-B-0018, ROANOKE RIVER FLOOD REDUCTION PROJECT, BENCH CUT 99, ROANOKE RIVER BASIN, ROANOKE, VA, IS AMENDED AS FOLLOWS:

A. SEE ATTACHED SUMMARY OF CHANGES FOR SPECIFICATION AND DRAWINGS CLARIFICATIONS.

B. THERE ARE NO OTHER CHANGES DUE TO THIS AMENDMENT.

1. CONTRACT ID CODE PAGE OF PAGES

J 1 2

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

16C. DATE SIGNED

BY 09-Dec-2009

16B. UNITED STATES OF AMERICA15C. DATE SIGNED15B. CONTRACTOR/OFFEROR

(Signature of Contracting Officer)(Signature of person authorized to sign)

8. NAME AND ADDRESS OF CONTRACTOR (No., Street, County, State and Zip Code) X W912HN-09-B-0018

X 9B. DATED (SEE ITEM 11)

18-Nov-2009

10B. DATED (SEE ITEM 13)

9A. AMENDMENT OF SOLICITATION NO.

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

X The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offer is extended, X is not extended.

Offer must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended by one of the following methods:

(a) By completing Items 8 and 15, and returning 1 copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN

REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE

CONTRACT ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(B).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

E. IMPORTANT: Contractor is not, is required to sign this document and return copies to the issuing office.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

10A. MOD. OF CONTRACT/ORDER NO.

2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO.(If applicable)

6. ISSUED BY

3. EFFECTIVE DATE

08-Dec-2009

CODE

USAED, SAVANNAH, WILMINGTON CONTRACT OFF

ATTH: HILDA AYERS

69 DARLINGTON AVE

WILMINGTON NC 28403-1343

W912HN 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODECODE

EMAIL:TEL:

SECTION 01 57 23 – TEMPORARY STORM WATER POLLUTION CONTROL

ADD Section Table of Contents Page 1 and Page 2 in their entirety.

SECTION 31 00 00 – EARTHWORK

(1) Delete existing Section Table of Contents Page 1 and Page 2 in their entirety and replace with enclosed revised Pages.

(2) Delete existing SECTION Page 1 through Page 11 in their entirety and replace with enclosed revised Pages.

NOTE:

Text that is added or revised by this amendment is replaced in its entirety and underlined and/or printed in bold and/or stamped appropriately.

The text changes may have necessitated reformatting of subsequent text or pages. If this is the case, those pages have also been issued as amended pages but are not underlined or bold text.

DRAWINGS

Delete existing Plate EC-3 in its entirety and replace with enclosed revised Plate.

(End of Summary of Changes)

Encls As stated

RRV Flood Reduction Project, Bench Cut 99 W912HN-09-B-0018 Roanoke River Basin, Ronoake, Virginia

SECTION TABLE OF CONTENTS

DIVISION 01 - GENERAL REQUIREMENTS

SECTION 01 57 23

TEMPORARY STORM WATER POLLUTION CONTROL

PART 1 GENERAL

1.1 REFERENCES

1.2 GENERAL REQUIREMENTS

1.3 SUBMITTALS

1.4 EROSION AND SEDIMENT CONTROLS

1.4.1 Stabilization Practices

1.4.1.1 Unsuitable Conditions

1.4.1.2 No Activity for Less Than 21 Days

1.4.2 Structural Practices

1.4.2.1 Temporary Silt Fences (VDCR ESCH Std. 3.05)

1.4.2.2 Temporary Rock Check Dams (VDCR ESCH Std. 3.20)

1.4.2.3 Temporary Diversion Dikes (VDCR ESCH Std. 3.09)

1.4.2.4 Temporary Straw Bales (VDCR ESCH Std. 3.04)

1.4.3 Temporary Stone Construction Entrance Material (VDCR ESCH Std.

3.02)

1.4.4 Temporary Turbidity Curtain (VDCR ESCH Std. 3.27)

1.4.5 Outlet Protection (VDCR ESCH Std. 3.18)

PART 2 PRODUCTS

2.1 COMPONENTS FOR SILT FENCES

2.1.1 Filter Fabric

2.1.2 Temporary Silt Fence Stakes and Posts

2.1.3 Mill Certificate or Affidavit

2.1.4 Identification Storage and Handling

2.2 Temporary Rock Check Dams

2.3 Temporary Diversion Dikes

2.4 Temporary Stone Construction Entrance Material

2.5 Temporary Turbidity Curtain

2.6 COMPONENTS FOR STRAW BALES

PART 3 EXECUTION

3.1 INSTALLATION OF SILT FENCES

3.2 INSTALLATION OF STRAW BALES

3.3 MAINTENANCE

3.3.1 Temporary Silt Fence Maintenance

3.3.2 Temporary rock check dams Maintenance

3.3.3 Temporary Diversion Dike Maintenance

3.3.4 Temporary Turbidity Curtain Maintenance

3.3.5 Temporary Stone Construction Entrance/Exit

3.3.6 Temporary Straw Bale Maintenance

3.4 INSPECTIONS

3.4.1 General

3.4.2 Inspections Details

SECTION 01 57 23 Page 1 (ADDED by Amendment No. 0002)

3.4.3 Inspection Reports

-- End of Section Table of Contents --

SECTION 01 57 23 Page 2 (ADDED by Amendment No. 0002)

SECTION TABLE OF CONTENTS

DIVISION 31 - EARTHWORK

SECTION 31 00 00

EARTHWORK

PART 1 GENERAL

1.1 REFERENCES

1.2 DEFINITIONS

1.2.1 Satisfactory Materials

1.2.2 Unsatisfactory Materials

1.2.3 Cohesionless and Cohesive Materials

1.2.4 Topsoil

1.2.5 Hard/Unyielding Materials

1.2.6 Rock

1.2.7 Unstable Material

1.2.8 Select Granular Material

1.3 MEASUREMENT

1.3.1 Excavation

1.3.2 Rock Excavation

1.3.3 Topsoil Requirements

1.4 PAYMENT

1.4.1 Unclassified Excavation

1.4.2 Rock Excavation

1.5 SUBMITTALS

1.6 SUBSURFACE DATA

1.7 CLASSIFICATION OF EXCAVATION

1.7.1 Common Excavation

1.7.2 Rock Excavation

1.8 BLASTING

PART 2 PRODUCTS (NOT APPLICABLE)

PART 3 EXECUTION

3.1 STRIPPING OF TOPSOIL

3.2 GENERAL EXCAVATION

3.2.1 Ditches, Gutters, and Channel Changes

3.2.2 Drainage Structures

3.2.3 Drainage

3.2.4 Underground Utilities

3.3 OPENING AND DRAINAGE OF EXCAVATION

3.4 GROUND SURFACE PREPARATION

3.4.1 General Requirements

3.4.2 Frozen Material

3.5 UTILIZATION OF EXCAVATED MATERIALS

3.6 BACKFILLING AND COMPACTION

3.7 FILLS

3.8 PLACEMENT

3.9 FINISHING

SECTION 31 00 00 Page 1 (Revised by Amendment No. 0002)

3.10 PLACING TOPSOIL

3.11 PROTECTION OF FILLS AND EXCAVATIONS

-- End of Section Table of Contents --

SECTION 31 00 00 Page 2

SECTION 31 00 00

EARTHWORK

PART 1 GENERAL

1.1 REFERENCES

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

ASTM INTERNATIONAL (ASTM)

ASTM C 136 (2006) Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates

ASTM D 1140 (2000; R 2006) Amount of Material in Soils Finer than the No. 200 (75-micrometer) Sieve

ASTM D 2434 (1968; R 2006) Permeability of Granular Soils (Constant Head)

ASTM D 2487 (2006) Soils for Engineering Purposes (Unified Soil Classification System)

ASTM D 422 (1963; R 2007) Particle-Size Analysis of Soils

ASTM D 4318 (2005) Liquid Limit, Plastic Limit, and Plasticity Index of Soils

ASTM D 5268 (2007) Topsoil Used for Landscaping Purposes

U.S. ARMY CORPS OF ENGINEERS (USACE)

EM 385-1-1 (2008) Safety and Health Requirements Manual

CITY OF ROANOKE REPORT

Final Project Action Plan For Materials Management, Third Channel Construction Contract FY 2009 Phase, Roanoke Flood Reduction Project, City of Roanoke, Virginia. Faulkner and Flynn, July 2009. Note: Referred to herein as the Materials Management Plan and is included in Appendix I

1.2 DEFINITIONS

1.2.1 Satisfactory Materials

Satisfactory materials for fills shall be any materials classified by ASTM D 2487 as GW, GP, GM, GP-GM, GW-GM, GC, GP-GC, GM-GC, SW, SP, SM, SW-SM, SC, SW-SC, SP-SM, SP-SC, CL, ML, CL-ML. Satisfactory materials for fills shall have stones less than 2 inches in any dimension.

SECTION 31 00 00 Page 3

1.2.2 Unsatisfactory Materials

Materials which do not comply with the requirements for satisfactory materials are unsatisfactory. Unsatisfactory materials also include man-made fills; trash; refuse; backfills from previous construction; and material classified as satisfactory which contains root and other organic matter or frozen material. The Contracting Officer shall be notified of any contaminated materials.

1.2.3 Cohesionless and Cohesive Materials

Cohesionless materials include materials classified in ASTM D 2487 as GW, GP, SW, and SP. Cohesive materials include materials classified as GC, SC, ML, and CL. Materials classified as GM and SM will be identified as cohesionless only when the fines are nonplastic. Perform testing, required for classifying materials, in accordance with ASTM D 4318, ASTM C 136, ASTM D 422, and ASTM D 1140.

1.2.4 Topsoil

Topsoil shall be as defined in ASTM D 5268. Material suitable for topsoils obtained from offsite areas or excavations areas indicated on the drawings is defined as: Natural, friable soil representative of productive, well-drained soils in the area, free of subsoil, stumps, rocks larger than one inch diameter, brush, weeds, toxic substances, and other material detrimental to plant growth. Amend topsoil pH range to obtain a pH of 5.5 to 7.

1.2.5 Hard/Unyielding Materials

Hard/Unyielding materials include weathered rock or dense consolidated materials which are not included in the definition "rock". These materials usually requires the use of heavy excavation equipment, ripper teeth, or jack hammers for removal.

1.2.6 Rock

Rock is defined as solid, massive, or bedded material which is indurated or firmly cemented, and which cannot be removed without systematic drilling and blasting, drilling and the use of expansion jacks or feather wedges, or the use of backhoe-mounted pneumatic hole punchers or rock breakers; also may include large boulders, buried masonry, or concrete other than pavement exceeding 1/2 cubic yard in volume. Removal of hard material will not be considered rock excavation because of intermittent drilling and blasting that is performed merely to increase production.

1.2.7 Unstable Material

Unstable material shall consist of materials too wet to properly support the required structure.

1.2.8 Select Granular Material

Select granular material consist of materials classified as GW, GP, SW, SP, by ASTM D 2487 where indicated. The liquid limit of such material must not exceed 35 percent when tested in accordance with ASTM D 4318. The plasticity index must not be greater than 12 percent when tested in accordance with ASTM D 4318, and not more than 35 percent by weight may be finer than No. 200 sieve when tested in accordance with ASTM D 1140.

SECTION 31 00 00 Page 4

Provide a minimum coefficient of permeability of 0.002 feet per minute when tested in accordance with ASTM D 2434.

1.3 MEASUREMENT

1.3.1 Excavation

The unit of measurement for excavation will be the cubic yard, computed by the average end area method from cross sections taken before and after the excavation operations. The volume to be paid for will be the number of cubic yards of material measured in its original position and removed from the excavation areas, including the excavation for ditches, and channel changes, when the material is acceptably utilized or disposed of as herein specified. The measurements will include authorized excavation of rock, authorized excavation of satisfactory soil excavation, authorized excavation of loose rock less than 1/2 cubic yard in volume, authorized excavation of special waste material, and the volume of loose, scattered rocks and boulders collected within the limits of the work; allowance will be made on the same basis for selected backfill ordered as replacement.

The measurement will not include the volume of other material that is scarified or plowed and reused in-place, and will not include the volume excavated without authorization or the volume of any material used for purposes other than directed. The volume of overburden stripped from borrow pits and the volume of excavation for ditches to drain borrow pits, unless used as borrow material, will not be measured for payment. The measurement will not include the volume of any excavation performed prior to the taking of elevations and measurements of the undisturbed grade.

1.3.2 Rock Excavation

The unit of measurement for rock excavation to be paid for will be the actual number of tons of rock which has been excavated and removed from the finished grade. The stone will be measured by being weighed in trucks on approved platform scales or by other approved weighing devices.

1.3.3 Topsoil Requirements

Separate excavation, hauling, and spreading or piling of topsoil and related miscellaneous operations will be considered subsidiary obligations of the Contractor, covered under the contract unit price for excavation.

1.4 PAYMENT

Payment will constitute full compensation for all labor, equipment, tools, supplies, and incidentals necessary to complete the work.

1.4.1 Unclassified Excavation

Unclassified excavation will be paid for at the contract unit price per cubic yard for "COMMON EXCAVATION".

1.4.2 Rock Excavation

All rock excavation will be paid for at the contract unit price per ton yard for ROCK EXCAVATION. The quantity to be paid for shall include both rippable rock and rock which requires blasting.

SECTION 31 00 00 Page 5

1.5 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. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Blasting; G;

Submit 15 days prior to starting work. See paragraph BLASTING.

SD-03 Product Data

Utilization of Excavated Materials; G Rock Excavation

Procedure and location for disposal of unused satisfactory material. Notification of encountering rock in the project.

SD-06 Test Reports

Testing

Within 24 hours of conclusion of physical tests, five (5) copies of test results, including calibration curves and results of calibration tests.

SD-07 Certificates

Testing

Qualifications of the commercial testing laboratory or the Contractor's testing facilities.

1.6 SUBSURFACE DATA

Subsurface soil boring logs and soil and rock laboratory data are in Appendix II. These data represent the best subsurface information available; however, variations may exist in the subsurface between boring locations.

1.7 CLASSIFICATION OF EXCAVATION

All excavation shall be considered unclassified.

1.7.1 Common Excavation

Common excavation shall include the satisfactory removal and disposal of all materials not classified as rock excavation.

1.7.2 Rock Excavation

Rock excavation shall include blasting, excavating, grading, and disposing of material classified as rock and shall include the satisfactory removal and disposal of boulders 1/2 cubic yard or more in volume; solid rock; rock material that is in ledges, bedded deposits, and unstratified masses, which

SECTION 31 00 00 Page 6 cannot be removed without systematic drilling and blasting; firmly cemented conglomerate deposits possessing the characteristics of solid rock impossible to remove without systematic drilling and blasting; and hard materials (see Definitions). The removal of any concrete or masonry structures, except pavements, exceeding 1/2 cubic yard in volume that may be encountered in the work shall be included in this classification. If at any time during excavation, the Contractor encounters material that may be classified as rock excavation, such material shall be uncovered and the Contracting Officer notified by the Contractor. The Contractor shall not proceed with the excavation of this material until the Contracting Officer has classified the materials as common excavation or rock excavation and has taken cross sections as required. Failure on the part of the Contractor to uncover such material, notify the Contracting Officer, and allow ample time for classification and cross sectioning of the undisturbed surface of such material will cause the forfeiture of the Contractor's right of claim to any classification or volume of material to be paid for other than that allowed by the Contracting Officer for the areas of work in which such deposits occur.

1.8 BLASTING

Blasting shall be performed as specified in Section 31 00 01, in accordance with EM 385-1-1, and in conformance with Federal, State, and local safety regulations. The Contractor shall obtain written approval prior to performing any blasting and shall notify the Contracting Officer 24 hours prior to blasting. The Contractor shall be responsible for damage caused by blasting operations.

PART 2 PRODUCTS (NOT APPLICABLE)

PART 3 EXECUTION

3.1 STRIPPING OF TOPSOIL

Topsoil shall be stripped to a depth of 4 inches. Topsoil shall be spread on areas already graded and prepared for topsoil, or transported and deposited in stockpiles convenient to areas that are to receive application of the topsoil later, or at locations indicated or specified. Topsoil shall be kept separate from other excavated materials, brush, litter, objectionable weeds, roots, stones larger than 2 inches in diameter, and other materials that would interfere with planting and maintenance operations. Any surplus of topsoil from excavations and grading shall be removed from the site.

3.2 GENERAL EXCAVATION

The Contractor shall perform excavation of every type of material encountered within the limits of the project to the lines, grades, and elevations indicated and as specified. Grading shall be in conformity with the typical sections shown and the tolerances specified in paragraph FINISHING. Rocks with any dimension greater than 2 inches that are exposed or laying on top of the finished grade of the excavation shall be removed.

Rock outcrops encountered during the excavation for the bench cuts that extend less than one foot above the finished grade of the bottom bench slope and for a distance of less than 50 feet may remain in place.

Satisfactory excavated materials shall be transported to and placed in fills within the limits of the work. Unsatisfactory materials encountered within the limits of the work shall be excavated below grade and replaced with satisfactory materials as directed by the Contracting Officer. Such

SECTION 31 00 00 Page 7 excavated material and the satisfactory material ordered as replacement shall be included in excavation. Surplus satisfactory excavated material not required for fill shall be disposed of in the City of Roanoke's East Gate Park. Unsatisfactory excavated material shall be disposed of in the designated disposal areas as indicated in Table 2, SECTION 01 74 19. During construction, excavation and fill shall be performed in a manner and sequence that will provide proper drainage at all times.

3.2.1 Ditches, Gutters, and Channel Changes

Excavation of ditches, gutters, and channel changes shall be accomplished by cutting accurately to the cross sections, grades, and elevations shown.

Ditches and gutters shall not be excavated below grades shown. Excessive open ditch or gutter excavation shall be backfilled with satisfactory, thoroughly compacted, material or with suitable stone or cobble to grades shown. Material excavated shall be disposed of as shown or as directed, except that in no case shall material be deposited less than 4 feet from the edge of a ditch. The Contractor shall maintain excavations free from detrimental quantities of leaves, brush, sticks, trash, and other debris until final acceptance of the work.

3.2.2 Drainage Structures

Excavations shall be made to the lines, grades, and elevations shown, or as directed. Trenches and foundation pits shall be of sufficient size to permit the placement and removal of forms for the full length and width of structure footings and foundations as shown. Rock or other hard foundation material shall be cleaned of loose debris and cut to a firm, level, stepped, or serrated surface. Loose disintegrated rock and thin strata shall be removed. When concrete or masonry is to be placed in an excavated area, the bottom of the excavation shall not be disturbed. Excavation to the final grade level shall not be made until just before the concrete or masonry is to be placed.

3.2.3 Drainage

Provide for the collection and disposal of surface and subsurface water encountered during construction. Completely drain construction site during periods of construction to keep soil materials sufficiently dry. The Contractor shall establish/construct storm drainage features (ponds/basins) at the earliest stages of site development, and throughout construction grade the construction area to provide positive surface water runoff away from the construction activity and/or provide temporary ditches, swales, and other drainage features and equipment as required to maintain dry soils. When unsuitable working platforms for equipment operation and unsuitable soil support for subsequent construction features develop, remove unsuitable material and provide new soil material as specified herein. It is the responsibility of the Contractor to assess the soil and ground water conditions presented by the plans and specifications and to employ necessary measures to permit construction to proceed.

3.2.4 Underground Utilities

Movement of construction machinery and equipment over pipes and utilities during construction shall be at the Contractor's risk. For work immediately adjacent to or for excavations exposing a utility or other buried obstruction, excavate by hand. Start hand excavation on each side of the indicated obstruction and continue until the obstruction is uncovered or until clearance for the new grade is assured. Support

SECTION 31 00 00 Page 8 uncovered lines or other existing work affected by the contract excavation until approval for backfill is granted by the Contracting Officer. Report damage to utility lines or subsurface construction immediately to the Contracting Officer. The Contractor is required to follow all Virginia Laws and Regulations in regard to locating utilities prior to excavating materials.

3.3 OPENING AND DRAINAGE OF EXCAVATION

The Contractor shall notify the Contracting Officer sufficiently in advance of the opening of any excavation to permit elevations and measurements of the undisturbed ground surface to be taken if required and/or directed by the Contracting Officer. Except as otherwise permitted, excavation areas shall be excavated providing adequate drainage. Overburden and other spoil material shall be transported to designated spoil areas or otherwise disposed of as prescribed in these specifications, or as directed. The Contractor shall ensure that excavation of any area, or dumping of spoil material results in minimum detrimental effects on natural environmental conditions.

3.4 GROUND SURFACE PREPARATION

3.4.1 General Requirements

Ground surface on which fill is to be placed shall be cleared and grubbed in accordance with SECTION 31 11 00, including stripping of live, dead, or decayed vegetation, rubbish, debris, and other unsatisfactory material;

plowed, disked, or otherwise broken up to a depth of 6 inches; pulverized;

moistened or aerated as necessary; thoroughly mixed; and compacted with three passes of the compaction equipment. Compaction shall be accomplished by sheepsfoot rollers, pneumatic-tired rollers, steel-wheeled rollers, tracktype equipment which exerts a ground pressure equivalent to or greater than that produced by a Caterpillar D4LGP dozer, or other approved equipment. The prepared ground surface shall be scarified and moistened or aerated as required just prior to placement of fill materials to assure adequate bond between fill material and the prepared ground surface.

3.4.2 Frozen Material

Fill shall not be placed on a foundation which contains frozen material, or which has been subjected to freeze-thaw action. 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 become the foundations 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 as, but not limited to, nights, holidays, weekends, winter shutdowns, or earthwork operations, shall be removed to a depth that is acceptable to the Contracting Officer and replaced with new material. Alternatively, the material will be thawed, dried, reworked, and recompacted to the specified criteria before additional material is placed. The Contracting Officer will determine when placement of fill shall cease due to cold weather. The Contracting Officer may elect to use average daily air temperatures, and/or physical observation of the soils for his determination. Fill material shall not contain frozen clumps of soil, snow, or ice.

SECTION 31 00 00 Page 9

3.5 UTILIZATION OF EXCAVATED MATERIALS

Unsatisfactory materials removed from excavations shall be disposed of in designated disposal areas as indicated in Table 2, SECTION 01 74 19.

Satisfactory material removed from excavations shall be used, insofar as practicable, in the construction of fills, bedding (as backfill), and for similar purposes. Excavated material used as fill shall meet the clean fill criteria. No satisfactory excavated material shall be wasted without specific written authorization. Satisfactory material authorized to be wasted shall be disposed of in the City of Roanoke's East Gate Park.

Coarse rock from excavations, which meets the specified requirements for stone protection in SECTION 32 22 13 STONE PROTECTION, can be stockpiled and used for constructing slopes or embankments adjacent to streams, or sides and bottoms of channels and for protecting against erosion. No excavated material shall be disposed of in such a manner to obstruct the flow of any stream, endanger a partly finished structure, impair the efficiency or appearance of any structure, or be detrimental to the completed work in any way.

3.6 BACKFILLING AND COMPACTION

Backfill adjacent to any and all types of structures shall be placed and compacted to at least 90 percent laboratory maximum density for cohesive materials or 95 percent laboratory maximum density for cohesionless materials in such a manner that will prevent wedging action or eccentric loading upon or against the structure. Ground surface on which backfill is to be placed shall be prepared as specified in paragraph GROUND SURFACE PREPARATION. Compaction requirements for backfill materials shall also conform to the applicable portions of paragraphs GROUND SURFACE PREPARATION. Compaction shall be accomplished by sheepsfoot rollers, pneumatic-tired rollers, steel-wheeled rollers, vibratory compactors, or other approved equipment.

3.7 FILLS

Fills shall be constructed from satisfactory materials free of organic or frozen material and rocks with any dimension greater than 2 inches. The material shall be placed in successive horizontal layers of loose material not more than 8 inches in depth. Each layer shall be spread uniformly on a soil surface that has been moistened or aerated as necessary, and scarified or otherwise broken up so that the fill will bond with the surface on which it is placed. After spreading, each layer shall be plowed, disked, or otherwise broken up; moistened or aerated as necessary; thoroughly mixed;

and compacted with three passes of the compaction equipment. Compaction shall be accomplished by sheepsfoot rollers, pneumatic-tired rollers, steel-wheeled rollers, tracktype equipment which exerts a ground pressure equivalent to or greater than that produced by a Caterpillar D4LGP dozer, or other approved equipment.

3.8 PLACEMENT

Topsoil shall stripped or removed from beneath proposed fill areas. The topsoil shall be stockpiled for reuse once the areas are filled to final grade.

Only clean fill and inert materials as defined by the specifications shall be placed within the disposal area and shall be free of organic matter and rocks larger than a maximum dimension of 5 inches. Material shall be placed in horizontal lifts not exceeding eight (8) inches in thickness, and

SECTION 31 00 00 Page 10 shall be compacted with three passes of the compaction equipment.

Compaction shall be accomplished by sheepsfoot rollers, pneumatic-tired rollers, steel-wheeled rollers, tracktype equipment which exerts a ground pressure equivalent to or greater than that produced by a Caterpillar D4LGP dozer, or other approved equipment. The in-place moisture content of the compacted fill shall be such as to facilitate compaction in the field as directed by the contracting officer.

Where new fill is placed on an existing ground surface that slopes more than 4:1 (horizontal:vertical), the existing surface shall be benched or stair-stepped to tie the new fill to the existing material. Elsewhere, the existing ground surface should be scarified, prior to filling, to assure new fill binds to the existing material.

If the compacted surface of any layer, is determined to be too smooth to bond properly with the succeeding layers, it shall be loosened by harrowing, or by any other approved method, before the succeeding layer is placed thereon. Fill shall not be placed upon a frozen surface, nor shall snow, ice, or frozen earth be incorporated in the embankment. As soon as practicable, after commencement of each section of the fill, the surface shall be graded so that it will drain freely and shall be so maintained throughout construction.

3.9 FINISHING

The surface of excavations, and fills shall be finished to a smooth and compact surface in accordance with the lines, grades, and cross sections or elevations shown. The degree of finish for graded areas shall be within

0.1 foot of the grades and elevations. Gutters and ditches shall be finished in a manner that will result in effective drainage. The surface of areas to be seeded or planted shall be finished to a smoothness suitable for the application of the seeding or planting materials. Settlement or washing that occurs in graded, topsoiled, or backfilled areas prior to acceptance of the work, shall be repaired and grades re-established to the required elevations and slopes.

3.10 PLACING TOPSOIL

On areas to receive topsoil, the compacted soil shall be scarified to a 2 inch depth for bonding of topsoil with subsoil. Topsoil then shall be spread evenly to a thickness of 4 inches and graded to the elevations and slopes shown. Topsoil shall not be spread when frozen or excessively wet or dry. Material required for topsoil in excess of that produced by excavation within the grading limits shall be obtained from offsite areas.

3.11 PROTECTION OF FILLS AND EXCAVATIONS

During construction, fills (i.e. temporary diversion dikes) and excavations shall be kept shaped and drained. Ditches and drains (i.e. drainage swales) shall be maintained to drain effectively at all times. The fills and excavations shall not be disturbed by traffic or other operation and shall be protected and maintained by the Contractor in a satisfactory condition.

-- End of Section --

SECTION 31 00 00 Page 11