Addendum 3 23388.pdf

DTMB-0414 (Rev 12/17)

DEPARTMENT OF TECHNOLOGY, MANAGEMENT AND BUDGET

State Facilities Administration Design and Construction Division

CONSTRUCTION BID ADDENDUM NO. 3

This form identifies an Addendum to Bidding Documents, and incorporates interpretations or clarifications, modifications, acceptance of proposed “or equal” materials, and other information into the Bidding Documents. Addenda will be numbered by the Professional and distributed through www.michigan.gov/SIGMAVSS as an attachment.

TO:

ALL BIDDERS

DATE ISSUED

3/7/2024

PROJECT NAME

Mackinac Island State Park Commission - Colonial Michilimackinac Powder Magazine Redesign

FILE NUMBER

751/23388.ABG

PROFESSIONAL

Matrix Consulting Engineers, Inc.

PROJECT DIRECTOR

Alan Goschka

BID OPENING DATE:

3/27/2024

ADDENDUM ITEMS: (attach additional sheets and drawings if required)

1. Isssued Sheet C-400 (attached).

2. Issued Specification Section 031000 “Site Clearing” (attached).

3. Issued Specification Section 312000 “Earth Moving” (attached).

ACKNOWLEDGMENT: This Addendum must be acknowledged by the Bidder in the space provided in the Bid Summary and Bid Form. Failing to acknowledge Addenda may be cause for the Bid to be rejected. Addenda will become part of the Contract Documents.

PROFESSIONAL: Devon Pung, Matrix Consulting Engineers DATE: 3/7/2024

APPROVED BY: Alan Goschka PROJECT DIRECTOR: Alan Goschka DATE: 3/7/2024 http://www.michigan.gov/SIGMAVSS

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AREA OF DISTURBANCE

1. CONTRACTOR SHALL COMPLY WITH REQUIREMENTS OF THE

SOIL EROSION AND SEDIMENTATION CONTROL ACT OF THE

STATE OF MICHIGAN, PART 91 OF ACT 451, OF THE PUBLIC

ACTS OF 1994 AND THE REQUIREMENTS OF THE STATE OF

MICHIGAN, DTMB.

2. THE CONTRACTOR SHALL CONDUCT OPERATIONS IN A

MANNER THAT WILL REDUCE ACCELERATED EROSION TO THE

PRACTICAL MINIMUM AND PREVENT DAMAGING SILTATION TO

EXISTING SEWERS AND WATER COURSES LEADING FROM THE

WORK SITE.

3. THE CONTRACTOR SHALL CONDUCT WORK IN SUCH A MANNER

AS TO PREVENT THE ENTRY OF FUELS, OILS, BITUMINOUS

MATERIALS, CHEMICALS, SEWERAGE OR OTHER HARMFUL

MATERIALS INTO NEARBY LAKES AND STREAMS.

4. WASTE DISPOSAL AREAS SHALL BE SELECTED BY THE

CONTRACTOR WITH FULL CONSIDERATION OF EROSION AND

SEDIMENT CONTROL, SELECTION OF DISPOSAL SITE, AND

CONTROL OF OPERATIONS, AND THE RESTORATION OF SAID

AREAS SHALL BE SUBJECT TO THE APPROVAL OF THE

ENGINEER.

5. EXCAVATION FROM THE RIGHT-OF-WAY, CHANNELS, OR OTHER

MATERIAL SHALL NOT BE DEPOSITED IN OR NEAR LAKES,

RIVERS, STREAMS, OR PONDS WHERE IT MAY ENTER THE

WATERWAY.

6. AT THE COMPLETION OF EACH DAY'S CONSTRUCTION, CARE

SHALL BE TAKEN TO ENSURE THAT MINIMAL EROSION WILL

OCCUR IN TRENCHES AND TO STOCKPILED MATERIALS UNTIL

RESUMPTION OF WORK.

7. CONTRACTOR SHALL CONFINE OPERATIONS TO THE MINIMUM

AMOUNT OF WORKING SPACE PRACTICAL TO MINIMIZE SOIL

EROSION.

8. THE PROJECT WILL BE PERIODICALLY INSPECTED BY THE

OWNER FOR EROSION CONTROL COMPLIANCE. DEFICIENCIES

WILL BE CORRECTED BY THE CONTRACTOR IMMEDIATELY

UPON NOTICE OF SUCH DEFICIENCIES. FAILURE TO CORRECT

THE DEFICIENCIES MAY RESULT IN THE ISSUANCE OF A STOP

WORK ORDER AND THERE WILL BE NO CONTRACT TIME

EXTENSION GRANTED FOR THIS TYPE OF STOPPAGE.

9. TEMPORARY SOIL EROSION CONTROL MEASURES CONSISTING

OF SILT FENCE, INLET FILTERS, AND MULCHING, SHALL BE

IMPLEMENTED THROUGHOUT THE ENTIRE CONSTRUCTION

PHASE OF THE PROJECT, AND SHALL BE REMOVED BY THE

CONTRACTOR AFTER THE PERMANENT SOIL EROSION

MEASURES HAVE BEEN COMPLETED.

10. STREET SWEEPING OR MUD REMOVAL SHALL BE PERFORMED

DAILY FOR MUD TRACKED ONTO PUBLIC STREETS. PAID FOR

AS PROJECT CLEANUP.

11. THE OWNER SHALL HAVE FULL AUTHORITY TO TEMPORARILY

SUSPEND WORK IN THE EVENT THAT ANY OF THE ABOVE

REQUIREMENTS ARE NOT BEING MET BY THE CONTRACTOR,

OR IF CONDITIONS INDICATE THAT ADDITIONAL TEMPORARY

CONTROL MEASURES ARE WARRANTED IN THE OPINION OF

THE ENGINEER

12. THE CONTRACTOR SHALL BE RESPONSIBLE FOR THE

MAINTENANCE OF THE SOIL EROSION CONTROL MEASURES

WITHIN THE CONSTRUCTION AREA UNTIL THE FULL

COMPLETION OF THE PROJECT.

SOIL EROSION AND

SEDIMENTATION CONTROL NOTES

CONSTRUCTION SEQUENCE

1. INSTALL SILT FENCE

2. STRIP AND STOCKPILE TOPSOIL FOR BACKFILL

3. INSTALL WATER PROOFING

4. BACKFILL TOPSOIL AND SEED

5. REMOVE SILT FENCE

MAINTENANCE SEQUENCE

THE CONTRACTOR SHALL INSPECT SESC MEASURES WEEKLY UNDER NORMAL CONDITIONS,

WITHIN 24 HOURS OF EACH RAIN EVENT, AND DAILY DURING A PROLONGED RAIN EVENT.

MEASURE MAINTENANCE SCHEDULE

SILT FENCE INSTALL AT THE DOWNSLOPE OF DISTURBED AREA AS

DIRECTED BY ENGINEER AT THE START OF CONSTRUCTION.

REMOVE ACCUMULATED SEDIMENTS WHEN DEPTH

REACHES 13 THE HEIGHT OF THE FENCE AND DISPOSE OF IN A

STABLE UPLAND SITE. THE FENCE SHALL BE RE-INSTALLED IF

WATER IS SEEPING UNDERNEATH IT OR IF THE FENCE HAS

BECOME INEFFECTIVE. SILT FENCE SHOULD BE REMOVED

ONCE VEGETATION IS ESTABLISHED AND UP-SLOPE AREA HAS

STABILIZED.

LEGEND

SF

EXCAVATION AREA

SILT FENCE

SOIL EROSION AND

SEDIMENTATION GENERAL NOTES

1. SOIL CONDITIONS - NATIVE SOILS ALREADY DISTURBED

GREG MINSHALL SE/C #00868

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PERMANENT SEEDING

file no.

checked by drawn by consultant issue date contract order no.

consultant job no.

23436.00

M a t r ix

751/23388.ABG

acct. template sheet description

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SOIL EROSION AND

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MEASURES PLAN

N SOIL EROSION AND SEDIMENTATION CONTROL MEASURES PLAN

SCALE: 1/4" = 1'-0"

0 1 5 10

3/7/2024 ADDENDUM 3

State of Michigan Project No. 23436.00 Department of Technology, Management and Budget March 2024 Design and Construction Division Department of Natural Resources File/No: 751/23388.ABG Mackinac Island State Park Commission – Colonial Michilimackinac Powder Magazine Redesign

SITE CLEARING 31-10 00 - 1

SECTION 31 10 00 – SITE CLEARING

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Removing above -and below-grade site improvements.

2. Disconnecting, capping, or sealing, and removing site utilities abandoning site utilities in place.

3. Temporary erosion and sedimentation control.

1.2 DEFINITIONS

A. Subsoil: Soil beneath the level of subgrade; soil beneath topsoil layers of a naturally occurring soil profile, typified by less than 1 percent organic matter and few soil organisms.

B. Surface Soil: Soil that is present at the top layer of the existing soil profile. In disturbed areas, surface soil is typically called “topsoil,” but in disturbed areas such as urban environments, the surface soil can be subsoil.

C. Topsoil: The top layer of the soil profile consisting of existing native surface topsoil or existing in-place surface soil; the zone where plant roots grow.

D. Topsoil: The top layer of the soil profile consisting of existing native surface topsoil or existing in-place surface soil; the zone where plant roots grow. Its appearance is generally friable, pervious, and black or a darker shade of brown, grey, or red than underlying subsoil; reasonably free of subsoil, clay lumps, gravel, and other objects larger than 2 inches in diameter; and free of weeds, roots, toxic materials, or other non-soil materials.

E. Vegetation: Trees, shrubs, groundcovers, grass, and other plants.

1.3 MATERIAL OWNERSHIP

A. Except for materials indicated to be stockpiled or otherwise remain the Owner’s property, cleared materials shall become the Contractor’s property and shall be removed from the Project site.

Design and Construction Division Department of Natural Resources File/No: 751/23388.ABG

SITE CLEARING 31-10 00 - 2

1.4 INFORMATIONAL SUBMITTALS

A. Existing Conditions: Documentation of existing trees and plantings, adjoining construction, and site improvements that establish preconstruction conditions that might be misconstrued as damage caused by the site clearing.

1. Use sufficiently detailed photographs or video recordings.

2. Include plans and notations to indicate specific wounds and damage conditions of each tree or other plant designated to remain.

B. Record Drawings: Identifying and accurately showing locations of capped utilities and other subsurface structural, electrical, and mechanical conditions.

1.5 FIELD CONDITIONS

A. Traffic: Minimize interference with adjoining roads, streets, walks, and other adjacent occupied or used facilities during site-clearing operations.

1. Do not close or obstruct streets, walks, or other adjacent occupied or used facilities without permission from the Owner and authorities having jurisdiction.

2. Provide alternate routes around closed or obstructed trafficways if required by the Owner or authorities having jurisdiction.

B. Utility Locator Service: Notify the utility locator service for the area where the Project is located before site clearing.

C. Do not commence site clearing operations until temporary soil erosion and sedimentation control measures, and tree protection fencing, are in place.

D. Soil Stripping, Handling, and Stockpiling: Perform only when the soil is dry or slightly moist.

PART 2 - PRODUCTS

PART 3 - EXECUTION

3.1 PREPARATION

A. Protect and maintain benchmarks and survey control points from disturbance during construction.

B. Protect existing site improvements to remain from damage during construction.

Design and Construction Division Department of Natural Resources File/No: 751/23388.ABG

SITE CLEARING 31-10 00 - 3

C. Restore damaged improvements to their original condition, as acceptable to the Owner.

3.2 TEMPORARY EROSION AND SEDIMENTATION CONTROL

A. Provide temporary erosion and sedimentation control measures to prevent soil erosion and discharge of soil-bearing water runoff or airborne dust to adjacent properties and walkways, according to erosion and sedimentation control Drawings and requirements of authorities having jurisdiction.

B. Inspect, maintain, and repair erosion and sedimentation control measures during construction until permanent vegetation has been established.

C. Remove erosion and sedimentation controls and restore and stabilize areas disturbed during removal.

D. Failure to follow temporary soil erosion and sedimentation control guidelines may result in $500 per day fines and assessment of actual damage costs.

3.3 EXISTING UTILITIES

A. Locate, identify, disconnect, and seal or cap utilities indicated to be removed or abandoned in place.

1. Arrange with utility companies to shut off indicated utilities.

B. Locate, identify, and disconnect utilities indicated to be abandoned in place.

C. Interrupting Existing Utilities: Do not interrupt utilities serving facilities occupied by the Owner or others, unless permitted under the following conditions and then only after arranging to provide temporary utility services according to the requirements indicated.

1. Notify the Engineer and Owner not less than 2 days in advance of proposed utility interruptions.

2. Do not proceed with utility interruptions without the Engineer’s written permission.

D. Removal of underground utilities is included in earthwork sections; if applicable fire suppression, plumbing, HVAC, electrical, communications, electronic safety and security, and utility sections; and in Section 02 4119 “Selective Demolition.”

3.4 SITE IMPROVEMENTS

A. Remove existing above -and below-grade improvements as indicated and necessary to facilitate new construction.

Design and Construction Division Department of Natural Resources File/No: 751/23388.ABG

SITE CLEARING 31-10 00 - 4

B. Remove slabs, paving, curbs, gutters, and aggregate base as indicated.

1. Unless existing full-depth joins coincide with the line of demolition, neatly saw-cut along the line of existing pavement to remain before removing adjacent existing pavement.

Saw-cut faces vertically.

3.5 DISPOSAL OF SURPLUS AND WASTE MATERIALS

A. Remove surplus soil material, unsuitable topsoil, obstructions, demolished materials, and waste materials including trash and debris, and legally dispose of them off the Owner’s property.

END OF SECTION 31 1000

Design and Construction Division Department of Natural Resources File/No: 751/23388.ABG

EARTH MOVING 31 20 00 - 1

SECTION 31 20 00 – EARTH MOVING

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section Includes:

1. Preparing subgrades for walks, pavements, turf, and grasses.

2. Subbase course for concrete walks and pavements.

3. Excavating and backfilling trenches for utilities and pits for buried utility structures.

B. Related Requirements:

1. Section 31 1000 “Site Clearing” for site stripping, grubbing, stripping and stockpiling topsoil, and removal of above -and below-grade improvements and utilities.

2. Section 32 9200 “Turf and Grasses” for finish grading in turf and grass areas, including preparing and placing planting soil for turf areas.

1.3 DEFINITIONS

A. Backfill: Soil material or controlled low-strength material used to fill an excavation.

1. Initial Backfill: Backfill placed beside and over the pipe in a trench, including haunches to support the sides of the pipe.

2. Final Backfill: Backfill placed over initial backfill to fill a trench.

B. Base Course: Aggregate layer placed between the subbase course and the hot-mix asphalt, or concrete, paving.

C. Bedding: Aggregate layer placed over the excavated subgrade in a trench before laying pipe.

D. Borrow Soil: Satisfactory soil imported from off-site for use as fill or backfill.

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EARTH MOVING 31 20 00 - 2

E. Drainage Course: Aggregate layer supporting the slab-on-grade that minimizes the upward capillary flow of pore water.

F. Excavation: Removal of material encountered above subgrade elevations and to lines and dimensions shown on Drawings.

1. Authorized Additional Excavation: Excavation below subgrade elevations or beyond indicated lines and dimensions as directed by the Engineer. Authorized additional excavation and replacement material will be paid for according to Contract provisions for changes in the Work.

G. Fill: Soil materials used to raise existing grades.

H. Rock: Rock material in beds, ledges, unstratified masses, conglomerate deposits, and boulders of rock material ¾ cu. yd. or more in volume.

I. Structures: Buildings, footings, foundations, retaining walls, slabs, tanks, curbs, mechanical and electrical appurtenances, or other man-made stationary features constructed above or below the ground surface.

J. Subbase Course: Aggregate layer placed between the subgrade and base course for hot-mix asphalt pavement, or aggregate layer placed between the subgrade and a concrete pavement or walk.

K. Subgrade: Uppermost surface of an excavation or the top surface of a fill or backfill immediately below subbase, drainage fill, drainage course, or topsoil materials.

L. Utilities: On-site underground pipes, conduits, ducts, and cables as well as underground services within buildings.

1.4 FIELD CONDITIONS

A. Traffic: Minimize interference with adjoining roads, streets, walks, and other adjacent occupied or used facilities during earth-moving operations.

1. Do not close or obstruct streets, walks, or other adjacent occupied or used facilities without permission from the Owner and authorizes having jurisdiction.

2. Provide alternate routes around closed or obstructed traffic ways if required by the Owner or authorities having jurisdiction.

3. Provide signage in accordance with MMUTCD.

B. Utility Locator Service: Notify the utility locator service for the area where the Project is located before beginning earth-moving operations.

Design and Construction Division Department of Natural Resources File/No: 751/23388.ABG

EARTH MOVING 31 20 00 - 3

C. Do not commence earth-moving operations until temporary site fencing and soil erosion and sedimentation control measures are in place and approved.

PART 2 - PRODUCTS

2.1 SOIL MATERIALS

A. General: Provide borrow soil materials when sufficient satisfactory soil materials are not available from excavations.

B. Satisfactory Soils: Soil Classification Groups GW, GP, GM; SW, SP, and SM according to ASTM D2487, or a combination of these groups; free of rock or gravel larger than 3 inches in any dimension, debris, waste, frozen materials, vegetation, and other deleterious matter.

C. Unsatisfactory Soils: Soil Classification Groups GC, SC, CL, ML, OL, CH, MH, OH, and PT according to ASTM D2487, or a combination of these groups.

1. Unsatisfactory soils also include satisfactory soils not maintained within 2 percent of optimum moisture content at the time of compaction.

D. Subbase Material: Naturally or artificially graded mixture of natural or crushed gravel, crushed stone, and natural or crushed sand; ASTM D2940/D2940M; with at least 90 percent passing a 1- 1/2-inch sieve and not more than 12 percent passing a No. 200 sieve. MDOT CL II granular fill.

E. Base Course: A naturally or artificially graded mixture of natural or crushed gravel, crushed stone, and natural or crushed sand; ASTM D2940/D2940M; with at least 95 percent passing a 1- 1/2-inch sieve and not more than 8 percent passing a No. 200 sieve. MDOT 22A or 21AA.

F. Engineered Fill: A naturally or artificially graded mixture of natural or crushed gravel, crushed stone, and natural or crushed sand; ASTM D2940/D2940M; with at least 90 percent passing a 1- 1/2-inch sieve and not more than 12 percent passing a No. 200 sieve.

G. Bedding Course: A naturally or artificially graded mixture of natural or crushed gravel, crushed stone, and natural or crushed sand; ASTM D2940/D2940M; except with 100 percent passing a 1-inch sieve and not more than 8 percent passing a No. 200 sieve. MDOT CL II.

H. Drainage Course: A narrowly graded mixture of [washed] crushed stone or crushed or uncrushed gravel; ASTM D448; course-aggregate grading Size 57; with 100 percent passing a 1-1/2-inch sieve and zero to 5 percent passing a No. 8 sieve.

I. Filter Material: A narrowly graded mixture of natural or crushed gravel, or crushed stone and natural sand; ASTM D448; coarse-aggregate grading Size 67; with 100 percent passing a 1-inch sieve and zero to 5 percent passing a No. 4 sieve.

Design and Construction Division Department of Natural Resources File/No: 751/23388.ABG

EARTH MOVING 31 20 00 - 4

J. Sand: ASTM C33/C33M; fine aggregate.

PART 3 - EXECUTION

3.1 PREPARATION

A. Protect structures, utilities, sidewalks, pavements, and other facilities from damage caused by settlement, lateral movement, undermining, washout, and other hazards created by earth-moving operations.

B. Protect and maintain erosion and sedimentation controls during earth-moving operations.

C. Protect subgrades and foundation soils from freezing temperatures and frost. Remove temporary protection before placing subsequent materials.

3.2 DEWATERING

A. Provide a dewatering system of sufficient scope, size, and capacity to control hydrostatic pressures and to lower, control, remove, and dispose of groundwater and permit excavation and construction to proceed on dry, stable subgrades. Dewatering will not be paid for separately.

B. Prevent surface water and groundwater from entering excavations, from ponding on prepared subgrades, and from flooding the Project site and surrounding area.

C. Protect subgrades from softening, undermining, washout, and damage by rain or water accumulation.

1. Reroute surface water runoff away from excavated areas. Do not allow water to accumulate in excavations. Do not use excavated trenches as temporary drainage ditches.

D. Dispose of water removed by dewatering in a manner that avoids endangering public health, property, and portions of work under construction or completed. Dispose of water and sediment in a manner that avoids inconvenience to others. Follow SESC best practices.

3.3 EXPLOSIVES

A. Explosives: Not permitted.

3.4 EXCAVATION FOR WALKS AND PAVEMENTS

A. Excavate surfaces under walks and pavements to indicated lines, cross sections, elevations, and subgrades.

Design and Construction Division Department of Natural Resources File/No: 751/23388.ABG

EARTH MOVING 31 20 00 - 5

3.5 EXCAVATION FOR UTILITY TRENCHES

A. Excavate trenches to indicate gradients, lines, depths, and elevations.

1. Beyond the building perimeter, excavate trenches to allow installation of the top of the pipe below the frost line.

B. Excavate trenches to uniform widths to provide the following clearance on each side of the pipe or conduit. Excavate trench walls vertically from the trench bottom to 12 inches higher than the top of the pipe or conduit unless otherwise indicated.

C. Trench Bottoms: Excavate trenches 4 inches deeper than the bottom of pipe and conduit elevations to allow for bedding course. Hand-excavate deeper for bells of pipe.

1. Excavate trenches 6 inches deeper than the elevation required in rock or other unyielding bearing material to allow for bedding course.

D. Protect trench slopes.

3.6 SUBGRADE INSPECTION

A. Notify the Engineer when excavations have reached the required subgrade.

B. If the Engineer determines that unsatisfactory soil is present, continue excavation and replace with compacted backfill or fill material as directed.

C. Authorized additional excavation and replacement material will be paid for according to Contract provisions for changes in the Work.

D. Reconstruct subgrades damaged by freezing temperatures, frost, rain, accumulated water, or construction activities, as directed by the Engineer, without additional compensation.

3.7 UNAUTHORIZED EXCAVATION

A. Fill unauthorized excavation under foundations or wall footings by extending the bottom elevation of the concrete foundation or footing to the excavation bottom, without altering the top elevation. Lean concrete fill, with a 28-day compressive strength of 2500 psi, may be used when approved by the Engineer.

1. Fill unauthorized excavations under other construction, pipe, or conduit as directed by the Engineer.

Design and Construction Division Department of Natural Resources File/No: 751/23388.ABG

EARTH MOVING 31 20 00 - 6

3.8 STORAGE OF SOIL MATERIALS

A. Stockpile borrow soil materials and excavated satisfactory soil materials without intermixing.

Place, grade, and shape stockpiles to drain surface water. Cover to prevent windblown dust.

1. Stockpile soil materials away from the edge of excavations. Do not store within the drip line of the remaining trees.

3.9 BACKFILL

A. Place and compact backfill in excavations promptly, but not before completing the following:

1. Construction below finish grade including, where applicable, subdrainage, damp proofing, waterproofing, and perimeter insulation.

2. Surveying locations of underground utilities for Record Documents.

3. Testing and inspecting underground utilities.

4. Removing concrete from work.

5. Removing trash and debris.

6. Removing temporary shoring, bracing, and sheeting.

7. Installing permanent or temporary horizontal bracing on horizontally supported walls.

B. Place backfill on subgrades free of mud, frost, snow, or ice.

3.10 UTILITY TRENCH BACKFILL

A. Place backfill on subgrades free of mud, frost, snow, or ice.

B. Place and compact bedding course on trench bottoms and where indicated. Shape bedding course to provide continuous support for bells, joints, and barrels of pipes and for joints, fittings, and bodies of conduits.

C. Backfill voids with satisfactory soil while removing shoring and bracing.

D. Initial Backfill:

1. Soil Backfill: Place and compact the initial backfill of subbase material, free of particles larger than 1 inch in any dimension, to a height of 12 inches over the pipe or tunnel.

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EARTH MOVING 31 20 00 - 7

a. Carefully compact initial backfill under pipe haunches and compact evenly up on both sides and along the full length of piping or conduit to avoid damage or displacement of piping or conduit. Coordinate backfilling with utility testing.

E. Final Backfill:

1. Soil Backfill: Place and compact final backfill of satisfactory soil to final subgrade elevation.

3.11 SOIL FILL

A. Plow, scarify, bench, or break up sloped surface steeper than 1 vertical to 4 horizontal so fill material will bond with existing material.

B. Place and compact fill material in layers to required elevations as follows:

1. Under grass and planted areas, use satisfactory topsoil material.

2. Under walks and pavements, use satisfactory base material.

3. Under steps and ramps, use engineered fill.

4. Under building slabs, use sand fill.

5. Under footings and foundations, use sand fill.

C. Place soil fill on subgrades free of mud, frost, snow, or ice.

3.12 SOIL MOISTURE CONTROL

A. Uniformly moisten or aerate subgrade and each subsequent fill or backfill soil layer before compaction to within 2 percent of maximum density.

1. Do not place backfill or fill soil material on surfaces that are muddy, frozen, or contain frost or ice.

2. Remove and replace, or scarify and air dry, otherwise satisfactory soil material that exceeds optimum moisture content by 2 percent and is too wet to compact to the specified dry unit weight.

Design and Construction Division Department of Natural Resources File/No: 751/23388.ABG

EARTH MOVING 31 20 00 - 8

3.13 COMPACTION OF SOIL BACKFILLS AND FILLS

A. Place backfill and fill soil materials in layers not more than 8 inches in loose depth for material compacted by heavy compaction equipment and not more than 4 inches in loose depth for material compacted by hand-operated tampers.

B. Place backfill and fill soil materials evenly on all sides of structures to required elevations and uniformly along the full length of each structure.

C. Compact soil materials to not less than the following percentages of maximum dry unit weight according to ASTM D698:

1. Under structures, building slabs, steps, and pavements, scarify and recompact the top 12 inches of existing subgrade and each layer of backfill or fill soil material at 95 percent maximum density.

2. Under walkways, scarify and recompact the top 6 inches below subgrade and compact each layer of backfill or fill soil material at 95 percent maximum density.

3. Under turf or unpaved areas, scarify and recompact the top 6 inches below subgrade and compact each layer of backfill or fill soil material at 85 percent.

3.14 GRADING

A. General: Uniformly grade areas to a smooth surface, free of irregular surface changes. Comply with compaction requirements and grade to cross sections, lines, and elevations indicated.

1. Provide a smooth transition between adjacent existing grades and new grades.

2. Cut out soft spots, fill low spots, and trim high spots to comply with required surface tolerances.

B. Site Rough Grading: Slope grades to direct water away from buildings and to prevent ponding.

Finish subgrades to elevations required to achieve finish elevations, within the following subgrade tolerances:

1. Turf or Unpaved Areas: Plus, or minus 0.10 ft.

2. Walks: Plus, or minus 0.10 ft.

3. Pavements: Plus, or minus 0.05 ft.

3.15 SUBBASE AND BASE COURSES UNDER PAVEMENTS AND WALKS

A. Place subbase course and base course on subgrades free of mud, frost, snow, or ice.

Design and Construction Division Department of Natural Resources File/No: 751/23388.ABG

EARTH MOVING 31 20 00 - 9

B. On the prepared subgrade, place the subbase course and base course under pavements and walks as follows:

1. Place base course material over the subbase course under hot-mix asphalt pavement.

2. Shape subbase course and base course to required crown elevations and cross-slope grades.

3. Place the subbase course and base course 6 inches or less in compacted thickness in a single layer.

4. Place the subbase course and base course that exceeds 6 inches in compacted thickness in layers of equal thickness, with no compacted layer more than 6 inches thick or less than 3 inches thick.

5. Compact subbase course and base course at optimum moisture content to required grades, lines, cross sections, and thickness to not less than 95 percent of maximum density.

3.16 DRAINAGE COURSE UNDER CONCRETE SLABS-ON-GRADE

A. Place drainage course on subgrades free of mud, frost, snow, or ice.

B. On prepared subgrade, place, and compact drainage course under cast-in-place concrete slabs-on-grade as follows:

1. Install subdrainage geotextile on prepared subgrade according to the manufacturer’s written instructions, overlapping sides and ends.

2. Place drainage course 6 inches or less in compacted thickness in a single layer.

3. Place drainage course that exceeds 6 inches in compacted thickness in layers of equal thickness, with no compacted layer more than 6 inches thick or less than 3 inches thick.

4. Compact each layer of drainage course to required cross sections and thickness to not less than 95 percent of maximum dry unit weight according to ASTM D698.

3.17 FIELD QUALITY CONTROL

A. Special Instructions: The owner will engage a qualified special inspector to perform the following special inspections:

1. Determine prior to placement of fill that the site has been prepared in compliance with requirements.

Design and Construction Division Department of Natural Resources File/No: 751/23388.ABG

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2. Determine that fill material classification and maximum lift thickness comply with requirements.

3. Determine, during placement and compaction, that the in-place density of compacted fill complies with requirements.

B. Testing Agency: The owner will engage a qualified geotechnical engineering testing agency to perform tests and inspections.

C. Allow the testing agency to inspect and test subgrades and each fill or backfill layer. Proceed with subsequent earth-moving only after test results for previously completed work comply with requirements.

D. Footing Subgrade: At footing subgrades, at least one test of each soul stratum will be performed to verify design-bearing capacities. Subsequent verification and approval of other footing subgrades may be based on a visual comparison of the subgrade with the tested subgrade when approved by the Engineer.

E. Testing agency will test the compaction of soils in place according to ASTM D1556, ASTM D2167, ASTM D2937, and ASTM D6938, as applicable. Tests will be performed at the following locations and frequencies:

1. Paved and Building Slab Areas: At subgrade and each compacted fill and backfill layer, at least one test for every 2000 sq. ft. or less of the paved area or building slab but in no case fewer than three tests.

F. When the testing agency reports that subgrades, fills, or backfills have not achieved the degree of compaction specified, scarify and moisten or aerate, or remove and replace soil materials to the depth required; recompact and retest until specified compaction is obtained.

3.18 PROTECTION

A. Protecting Graded Areas: Protect newly graded areas from traffic, freezing, and erosion. Keep free of trash and debris.

B. Repair and reestablish grades to specified tolerances where completed, or partially completed surfaces become eroded, rutted, settled, or where they lose compaction due to subsequent construction operations or weather conditions.

1. Scarify or remove and replace soil material to depth as directed by the Engineer; reshape and recompact.

C. Where settling occurs before the Project correction period elapses, remove finished surfacing, backfill with additional soil material, compact, and reconstruct surfacing.

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1. Restore the appearance, quality, and condition of finished surfacing to match adjacent work, and eliminate evidence of restoration to the greatest extent possible.

3.19 DISPOSAL OF SURPLUS AND WASTE MATERIALS

A. Transport surplus satisfactory soil to designated storage areas on the Owner’s property.

Stockpile or spread soil as directed by the Engineer.

1. Remove waste materials, including unsatisfactory soil, trash, and debris, and legally dispose of them off the Owner’s property.

END OF SECTION 31 20 00