MSCS South Detention Pond Project Manual & Specs.pdf

PROJECT MANUAL

Morley Stanwood Community Schools South Detention Pond Renovations

Morley, Michigan

Bid Package 1 Monday, July 7, 2025

Detention Pond Renovations Earthwork

Site Engineer Comprehensive Engineering/Tower Pinkster 4650 Plainfield Ave NE Suite A Grand Rapids, MI 49525

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Project: Morley Stanwood Community Schools South

Detention Pond Renovations

Owner: Morley Stanwood Community Schools

4700 Northland Drive

Morley, MI 49336

Architect/Engineer: Comprehensive Engineering/Tower Pinkster

4650 Plainfield Ave NE Suite A

Grand Rapids, MI 49525

Sealed proposals for all work categories as described in the Project Manual for the above project will be received no later than 7/31/25 2pm. Proposals should be addressed to Morley Public Schools, Attn

Roger Cole, and delivered to Morley Stanwood Community Schools at the address listed above. All proposals will be publicly opened.

All contractors bidding on work must be bondable and must include in their bid the cost for furnishing a

Co-Obligee Labor and Material Payment Bond and a Co-Obligee Performance Bond. On the proposal form the contractor will identify a cost to be deducted from their bid should bonds not be required.

Contract documents may be obtained after 7/11/2025, Email Adam Seng adam.seng@christmanco.com

All questions are to be directed to the Morley Stanwood: Roger Cole rcole@morleystanwood.org.

Construction Schedule: Start Once State Approval Given – Complete No later than November 1,2025

Each Proposal shall be accompanied by a certified check, cashiers' check, money order, or bid bond made payable to Morley Stanwood Community Schools in an amount not less than five percent (5%) of the base bid as a bid security. The Bid Security of Bidders under consideration will be returned immediately after award of contracts by the Owner. The amount of the guarantee shall be forfeited to the

Owner if the successful Bidder fails to enter into a contract and furnish required bonds and insurance within 30 days after award of contracts.

All proposals submitted shall remain valid for a period of sixty (120) days after the bid date. The Owner, reserve the right to waive any irregularities, reject any or all proposals, or accept any proposal, which, in their opinion, will serve their best interest.

Award will be issued after State and Board Approval

Bid Proposal Form:

Having carefully examined Specifications, Drawings, all Addenda issued, Work Category Descriptions, and understanding the scope of work involved in this Work Category and those that interface with it (them), the undersigned does hereby propose to furnish all labor, materials, insurances, taxes, tools, equipment and services to complete all work required for the Work Category indicated in accordance with the Work Category

Description and the Contract Documents prepared by _______.

BASE PROPOSAL SUM:

PERFORMANCE & PAYMENT BOND: The Trade Contractor may be required to furnish a Co-Obligee Labor &

Material Payment & Performance Bonds for the full contract amount.

The name of the Bonding Company is: .

The sum of ($ ) to cover cost of furnishing these bonds is included in the base bid.

ADDENDA: The following Addenda have been received, are hereby acknowledged, and their execution is included in Bid Sums listed herein.

No _____ Dated __________ No _____ Dated __________ No. _____ Dated __________

SCHEDULE:

The undersigned if awarded a Contract, agrees to work concurrently with the work owner, according to the

"Approved Construction Schedule."

BIDDER'S CERTIFICATE:

I hereby certify that all statements herein are made on behalf of

(Name of Corporation, Partnership or Person Submitting a Bid)

A Corporation organized and existing under the laws of the State of

An individual doing business as

Signature:

Title:

Address:

Phone:

Fax:

Email:

Scope of Work & General Requirements for All Subcontractors

Work Included:

1. All permits, fees, inspections and approvals required by governing jurisdictions are included within base bid. Coordinate well in advance (at least 24 hours), required inspections and testing with the Owner This will include liaison between state and local agencies to ensure code compliance and for securing approval for the facility.

2. Cleanup is required on a daily basis, and/or as directed by the Owner. Cleanup dunnage, shipping materials and associated materials/debris generated from installation and dispose of properly. At no time will shipping containers, crates, materials, piles of debris, tarps, boxes, etc. be left on site, un-attended and unsecured, subject to unsafe conditions (i.e. access, fire and slip hazards and wind blown debris).

3. At least two (2) weeks prior to starting on-site, meet with the Owner, Architect and Engineer to discuss and resolve any issues relating to status of material procurements, site conditions, access, staging/storage requirements, safety, testing, sequencing and scheduling of work.

4. Any work that could interfere with existing owners operation, i.e. use of certain roads, parking lots, access to buildings, shall require pre-task planning with the Owner and shut-down notification requests shall be prepared (72) hrs in advance of any work being scheduled. Pre-task planning shall review and discuss scheduling, coordination with Owner operations, working durations, safe practices and procedures.

5. Protect existing structures, equipment, and finishes, including new work in place, from damage during the performance of this work category. Any protection removed to facilitate other work shall be reinstalled / replaced by the trade needing access.

6. Include all layout and engineering for each work category.

7. Prior to commencing with installation, verify all field conditions and measurements and report any discrepancies to the Owner.

8. Provide full-time on-site supervision during the performance of your work. Supervision will be responsible for coordination, scheduling, safety, manpower, and other activities necessary to achieve safety, quality and scheduling requirements set forth under this work category. Supervision shall not be removed from this project without prior written consent and approval of the Owner.

9. Full compliance with all site specific rules and regulations, including (but not limited to) OSHA, State Authorities, Local Authorities, and the Owner.

10. For material deliveries, if traffic control is required, Subcontractor to arrange manpower accordingly and provide signage, barricading, flagman etc., necessary for the safe performance of own work and protection of the public. Staging, storage on-site, and all deliveries required to support this installation must be reviewed and approved in advance by the Owner.

11. Furnish and receive all required materials and deliver FOB jobsite. All deliveries shall be closely coordinated with the Owner and 72 hour advance notice shall be given prior to delivery. Unless noted otherwise, deliveries must be coordinated to be complete with unloading during normal working hours.

12. This subcontractor will receive and handle all respective material and properly store/protect before, during and after installations. Excessive and out-of-sequence deliveries will be prohibited and subject to re-handling and removal offsite as directed by the Owner.

13. Furnish all hoisting, lifting, scaffolding, and handling to complete your own work.

14. In the event of any jurisdictional or labor issues, the subcontractor assigned the work shall arrange to complete all work as required to avoid any interruptions/continuity of work on this project at no additional cost. All labor requirements pertaining to the project will be met.

15. Cooperate fully with representatives from Architect, Engineer, Owner, and independent testing agency, and allow for in progress inspections, including providing access to areas of work, when required.

16. This project may require multiple phases, which will require re-mobilization. All costs for multiple phasing shall be included.

17. Each Trade Contractor shall assume full responsibility for all pre-ordered products after their arrival at this designated location. This includes transportation, storage, start-up, warranty services, and installation in accordance with the General Conditions unless otherwise specified.

Work Category No. 02 – Earthwork and Site Utilities

Work Included:

The subcontractor shall timely perform all Earthwork and Site Utility work, as detailed below, in accordance with the contract documents (including Bidding Requirements, Proposal Section, Contract Forms, General Conditions, Supplemental Conditions, General Requirements, Addenda, etc.), including, but not limited to, the following Specification Sections and Work Scope Items. Unless otherwise noted, this contractor is responsible for all items specified in the following specifications sections:

311000 – Site Clearing

312000 – Earthwork

321300 – Asphalt Paving

323113 – Chain Link Fences and Gates

329300 – Planting

334000 – Storm Drainage

Work Category Notes:

1. Demolition and clearing/grubbing of the entire site, including, but not limited to, the removal of trees, tree roots, topsoil removal, vegetation and deleterious materials as shown or specified, hard surfaces, fences, handrails, retaining walls, posts, gates, signs, etc. Includes all labor, material, accessories, and equipment for a complete installation.

2. Provide all utility demolition as shown or specified including, but not limited to water lines, fire lines, concrete pipe, hydrants, backflow preventors, sewer and storm cleanouts, pipe, and manholes, irrigation pumps, monitoring wells, access ports, etc.

3. Provide all mass excavation, grading, compaction, backfill, berms and off-site borrowed fill to final subgrade elevations as shown or specified, including backfill required around the building foundations, foundation walls, retaining walls, sidewalks, curb and gutters, drives, asphalt paving, etc. This is to include all rough and final grading to +/- 0.1’. All unsuitable soils and materials shall not be permitted to be stockpiled and must be removed on a daily basis.

4. Coordinate and develop soil erosion plan with the Construction Manager for submission to appropriate jurisdiction. Furnish and install soil erosion control measures as shown and/or specified. Maintain soil erosion control measures during the course of this project. Remove erosion control and clean all catch basins and/or pipe as required at completion of project. All inspection logs to be copied directly to the Construction Manager and copies shall be kept within a soil erosion control manual, located within the Construction Manager’s trailer.

5. Provide all cutting, patching and repairs by a qualified person as required of existing roadways, landscape areas, paving, hardscape, etc. disturbed by this scope of work.

6. Provide all required tree protection, sedimentation and water pollution control shown, specified or necessary to perform the work in this package or the work of others, including maintenance and removal upon completion and acceptance of work by the governing agency.

7. Provide all dewatering (ground and rain water) as necessary until final grade and complete and operational storm system is available. All ground water will be diverted so as not to interfere with construction or public traffic flow and the operations of the existing facility. All drainage inlets shall be protected as specified. Maintenance of dewatering system to be considered a 24 hour/7 day week assignment.

8. This subcontractor shall participate in all coordination meetings (internal and meetings with local agencies and those having jurisdiction) concerning the relocation of existing utilities so as not to impact the existing facility operations. Include temporary utilities and provisions as necessary to allow relocation of existing utilities without interruption of service to existing facilities. This contractor to provide for temporary support and protections for any existing utility or other piping encountered during performance of this work. Include verification of existing utility locations prior to excavations, and monitoring during excavation and backfill.

9. Provide all right-of way bonds, etc. as required by city, county, and state agencies relative to the work within this package.

10. Prior to any imported soils entering project site, provide material analytical soils reports and documentation that material is free of contaminants/hazardous materials.

11. Clean roads and staging areas of any tracking dirt or debris generated during site clearing, excavation, earth retention, foundations/slab-on-grade and caisson activities as necessary or as directed by the Construction Manager. Dust control and street cleaning on a regular basis as job conditions require.

12. Furnish and install all under-drain/foundation drainage systems as shown and specified.

13. Strip and stockpile topsoil for re-use. Re-spread topsoil to within specified tolerances, upon completion of rough grading. Large clumps of dirt and stones shall be removed from topsoil.

14. Where existing asphalt paving is removed for new utilities, place compacted aggregate base to bottom of asphalt for asphalt patch by others. If asphalt cannot be patched immediately, place aggregate to top of adjacent asphalt. Remove additional aggregate at such time when asphalt can be placed.

15. Install, maintain, and remove temporary roads for concrete & delivery trucks to move under their own power by WC 02.

Specific Notes and Details:

The following details and notes are included in this Work Category; this list is to clarify the specific items noted below and does not exclude other details or otherwise limit the scope of work for this Work Category.

1. Include all haul o extra materials.

2. Include import all of topsoil, sand, clay, etc.. needed for a complete scope of work.

3. Include all seeding/blankets needed for a complete scope of work.

4. Include all permits needed for this scope of work including all inspections/testing requirements. This is does include paying for all permits needed.

5. All cutting & patching of asphalt/concrete required this scope of work.

6. Include all tree protection per contract documents.

7. Include temp roads needed for this scope of work along with removal/repairing and seeding once completed.

8. Include all SESC requirements for the project, along with reports.

9. Include all street sweeping for the duration of the project.

10. Include all testing requirements for this scope of work for complete project.

11. Provide all layout required for this scope of work.

12. Provide and install all topsoil needed for complete scope.

13. Contractor to assist in limits of temporary easement area of work.

Unit Prices:

Unit Prices are to be complete furnished in-place operations, and include all costs, incidental materials and work, insurance, fringes, bonds, engineering, overhead and profit. Provide Breakdown of unit pricing.

End of Work Category No. 02

Project No:20223 CA2 Permits South Detention Pond Renovations May 6, 2025 Morley Stanwood Community Schools

SPECIFICATION SECTIONS:

311000 – Site Clearing 312000 – Earthwork 321300 – Asphalt Paving 323113 – Chain Link Fences and Gates 329300 – Planting 334000 – Storm Drainage

Comprehensive Engineering 31 10 00-1 Site Clearing

SECTION 311000 - SITE CLEARING

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section.

1.2 SUMMARY

A. This Section includes the following:

1. Protecting existing trees, shrubs, groundcovers, plants and grass to remain.

2. Removing existing trees, shrubs, groundcovers, plants and grass.

3. Clearing and grubbing.

4. Stripping and stockpiling topsoil.

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

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

7. Temporary erosion and sedimentation control measures.

B. Related Sections include the following:

1. Division 01 Section "Temporary Facilities and Controls" for temporary utilities, temporary construction and support facilities, temporary security and protection facilities, and temporary erosion and sedimentation control procedures.

2. Division 01 Section "Execution" for verifying utility locations and for recording field measurements.

3. Division 31 Section "Earthwork" for soil materials, excavating, backfilling, and site grading.

4. Division 32 Section "Turf and Grasses" for finish grading including preparing and placing planting soil mixes and testing of topsoil material.

1.3 DEFINITIONS

A. Topsoil: Natural or cultivated surface-soil layer containing organic matter and sand, silt, and clay particles; friable, pervious, and black or a darker shade of brown, gray, or red than underlying subsoil; reasonably free of subsoil, clay lumps, gravel, and other objects more than 2 inches (50 mm) in diameter; and free of subsoil and weeds, roots, toxic materials, or other nonsoil materials.

B. Tree Protection Zone: Area surrounding individual trees or groups of trees to be protected during construction and defined by the drip line of individual trees or the perimeter drip line of groups of trees, unless otherwise indicated.

1.4 MATERIAL OWNERSHIP

A. Except for stripped topsoil or other materials indicated to remain Owner's property, cleared materials shall become Contractor's property and shall be removed from Project site.

Comprehensive Engineering 31 10 00-2 Site Clearing

1.5 SUBMITTALS

A. Photographs or videotape, sufficiently detailed, of existing conditions of trees and plantings, adjoining construction, and site improvements that might be misconstrued as damage caused by site clearing.

B. As built drawings, according to Section 017839 "Project Record Documents," identifying and accurately locating capped utilities and other subsurface structural, electrical, and mechanical conditions.

1.6 QUALITY ASSURANCE

A. Preinstallation Conference: Conduct conference at Project site to comply with requirements in Section 013100 "Project Management and Coordination."

1.7 PROJECT 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 Owner and authorities having jurisdiction.

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

B. Salvable Improvements: Carefully remove items indicated to be salvaged and store on Owner's premises where indicated.

C. Utility Locator Service: Notify utility locator service (MISS DIG 1-800-482-7171) for area where Project is located before site clearing.

D. Do not commence site clearing operations until temporary erosion and sedimentation control measures are in place.

PART 2 – PRODUCTS

2.1 SOIL MATERIALS

A. Satisfactory Soil Materials: Requirements for satisfactory soil materials are specified in

Section 312000 "Earthwork."

1. Obtain approved borrow soil materials off-site when satisfactory soil materials are not available on-site.

PART 3 - EXECUTION

3.1 PREPARATION

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

B. Locate and clearly flag trees and vegetation to remain or to be relocated.

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

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

Comprehensive Engineering 31 10 00-3 Site Clearing

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 requirements of authorities having jurisdiction.

B. Inspect, repair, and maintain 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.

3.3 TREE PROTECTION

A. Erect and maintain temporary fencing around tree protection zones before starting site clearing. Remove fence when construction is complete.

1. Do not store construction materials, debris, or excavated material within fenced area.

2. Do not permit vehicles, equipment, or foot traffic within fenced area.

3. Maintain fenced area free of weeds and trash.

B. Do not excavate within tree protection zones, unless otherwise indicated.

C. Where excavation for new construction is required within tree protection zones, hand clear and excavate to minimize damage to root systems. Use narrow-tine spading forks, comb soil to expose roots, and cleanly cut roots as close to excavation as possible.

1. Cover exposed roots with burlap and water regularly.

2. Temporarily support and protect roots from damage until they are permanently redirected and covered with soil.

3. Coat cut faces of roots more than 1-1/2 inches (38 mm) in diameter with an emulsified asphalt or other approved coating formulated for use on damaged plant tissues.

4. Backfill with soil as soon as possible.

D. Repair or replace trees and vegetation indicated to remain that are damaged by construction operations, in a manner approved by Architect.

1. Employ an arborist, licensed in jurisdiction where Project is located, to submit details of proposed repairs and to repair damage to trees and shrubs.

2. Replace trees that cannot be repaired and restored to full-growth status, as determined by Architect.

3.4 UTILITIES

A. Owner will arrange for disconnecting and sealing indicated utilities that serve existing structures before site clearing, when requested by Contractor.

1. Verify that utilities have been disconnected and capped before proceeding with site clearing.

B. Locate, identify, disconnect, and seal or cap off utilities indicated to be removed.

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

Comprehensive Engineering 31 10 00-4 Site Clearing

2. Owner will arrange to shut off indicated utilities when requested by Contractor.

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

1. Notify Architect not less than two days in advance of proposed utility interruptions.

2. Do not proceed with utility interruptions without Architect's written permission.

D. Excavate and remove underground utilities indicated to be removed. Backfill excavated areas in compacted horizontal layers not exceeding a loose depth of 8 inches per Section 312000.

3.5 CLEARING AND GRUBBING

A. Remove obstructions, trees, shrubs, grass, and other vegetation to permit installation of new construction.

1. Do not remove trees, shrubs, and other vegetation indicated to remain or to be relocated.

2. Cut minor roots and branches of trees indicated to remain in a clean and careful manner where such roots and branches obstruct installation of new construction.

3. Grind stumps and remove roots, obstructions, and debris extending to a depth of 18 inches (450 mm) below exposed subgrade.

4. Use only hand methods for grubbing within tree protection zone.

5. Chip removed tree branches and dispose of off-site.

B. Fill depressions caused by clearing and grubbing operations with satisfactory soil material unless further excavation or earthwork is indicated.

1. Place fill material in horizontal layers not exceeding a loose depth of 8 inches (200 mm), and compact each layer to a density equal to adjacent original ground.

3.6 TOPSOIL STRIPPING

A. Remove sod and grass before stripping topsoil.

B. Strip topsoil to whatever depths are encountered in a manner to prevent intermingling with underlying subsoil or other waste materials.

1. Remove subsoil and nonsoil materials from topsoil, including trash, debris, weeds, roots, and other waste materials.

C. Stockpile topsoil materials away from edge of excavations without intermixing with subsoil. Grade and shape stockpiles to drain surface water. Cover to prevent windblown dust.

1. Limit height of topsoil stockpiles to 72 inches (1800 mm).

2. Do not stockpile topsoil within tree protection zones.

3. Dispose of excess topsoil as specified for waste material disposal.

4. Stockpile surplus topsoil to allow for respreading deeper topsoil.

Comprehensive Engineering 31 10 00-5 Site Clearing

3.7 SITE IMPROVEMENTS

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

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

1. Unless existing full-depth joints coincide with line of demolition, neatly saw-cut length of existing pavement to remain before removing existing pavement. Saw-cut faces vertically.

2. Paint cut ends of steel reinforcement in concrete to remain to prevent corrosion.

3. All concrete saw cutting shall be completed in accordance with MIOSHA

Standards to protect construction workers from exposure to silica.

3.8 DISPOSAL

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

1. Separate recyclable materials produced during site clearing from other non-recyclable materials. Store or stockpile without intermixing with other materials and transport them to recycling facilities.

END OF SECTION 311000

Comprehensive Engineering 31 20 00-1 Earthwork

SECTION 312000 - EARTHWORK

Conditions and Division 1 Specification Sections, apply to this Section.

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

2. Subbase and base course for asphalt paving.

3. Excavating and backfilling for utility trenches.

4. Excavating and backfilling trenches for buried mechanical and electrical utilities and pits for buried utility structures.

B. Related Sections include the following:

1. Division 32 Section “Asphalt Paving” for paving specifications.

2. Division 32 Section "Turf and Grasses" for finish grading, including preparing and placing topsoil and planting soil for lawns.

1.3 REFERENCES

A. Michigan Department of Transportation (MDOT), Standard Specification for Construction, latest edition.

B. Natural Resources and Environmental Protection Act, 1994 PA 451, and State of Michigan Soil

Erosion and Sedimentation Control Rules part 91, as amended and all local ordinances.

C. American Society for Testing and Materials (ASTM) applicable standards.

1.4 DEFINITIONS

A. Backfill: Soil material used to fill an excavation.

B. Base Course: Course placed between the subbase course and hot-mix asphalt paving.

C. Bedding Course: Course 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.

E. Excavation: Removal of material encountered above subgrade elevations to lines and dimensions indicated.

1. Authorized Additional Excavation: Authorized additional excavation and replacement material will be paid for according to Contract provisions.

2. Unauthorized Excavation: Unauthorized excavation, as well as remedial work required, shall be without additional compensation.

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

G. HDPE: High Density Polyethylene.

Comprehensive Engineering 31 20 00-2 Earthwork

H. Rock: Rock material that cannot be removed by rock excavating equipment without systematic drilling, ram hammering, or ripping.

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: Course placed between the subgrade and base course for hot-mix asphalt pavement, or course placed between the subgrade and a concrete slab, pavement, or walk.

K. Subgrade: Surface or elevation remaining after completing excavation, or top surface of a fill or backfill immediately below subbase, drainage fill, or topsoil materials.

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

1.6 SUBMITTALS

A. Product Data: For the following:

1. Perforated subdrainage pipe (drain tile)

2. Erosion control blanket

3. Geotextile filter fabric jacket for perforated pipe subdrainage.

4. Cellular confinement material.

B. Material Test Reports: From a qualified testing agency indicating and interpreting test results for compliance of the following with requirements indicated:

1. Classification according to ASTM D 2487 of each borrow soil material proposed for fill and backfill.

2. Laboratory compaction curve according to ASTM D 698 for each borrow soil material proposed for fill and backfill.

3. Verification of suitability of each footing subgrade material, in accordance with specified requirements.

4. Field reports showing locations and results of in-place soil density tests.

5. One optimum moisture-maximum density curve for each type of soil encountered.

6. Report of actual unconfined compressive strength and/or results of veering tests of each strata tested.

C. Preexcavation Photographs or Videotape: Show existing conditions of adjoining construction and site improvements, including finish surfaces, that might be misconstrued as damage caused by earthwork operations. Submit before earthwork begins.

D. Samples: CM to contact testing firm to obtain a composite sample of the proposed fill material at least one week prior to beginning of fill work.

E. Field quality-control reports.

1.7 QUALITY ASSURANCE

A. Soil Borings and Geotechnical Engineering Report: Perform work in accordance with this

Specification and Geotechnical Engineering Report # 201397 by Material Testing Consultants, dated November 2020. In case of discrepancy between the drawings, specifications and Geotechnical report, meet the more stringent requirements of each.

Comprehensive Engineering 31 20 00-3 Earthwork

B. Codes and Standards: Perform excavation work in compliance with applicable requirements of authorities having jurisdiction.

C. Testing and Inspection Services: Testing of earthwork shall be arranged and paid for as specified in Division 1, General Requirements. Give Owner and testing laboratory at least 24 hours notice prior to beginning any operation that requires testing.

D. Testing Laboratory Qualifications: To qualify for acceptance, the geotechnical testing laboratory must demonstrate, to Engineer’s satisfaction, based on evaluation of laboratory submitted criteria conforming to ASTM E 699, that it has the experience and capability to conduct required field and laboratory geotechnical testing without delaying the progress of the work.

1.8 PROJECT CONDITIONS

A. Site Information: Data in subsurface investigation reports was used for the basis of the design and are available to the Contractor for information only. Conditions are not intended as representations or warranties of accuracy or continuity between soil borings. The Owner will not be responsible for interpretations or conclusions drawn from this data by Contractor.

1. Additional test borings and other exploratory operations may be performed by Contractor, at the Contractor’s option; however, no charge in the Contract Sum will be authorized for such additional exploration.

2. Do not interrupt utilities serving facilities occupied by Owner or others unless permitted in writing and then only after arranging to provide temporary utility services according to requirements indicated.

a. Notify Owner not less than two days in advance of proposed utility interruptions.

b. Do not proceed with utility interruptions without written permission.

c. Contact utility-locator service for area where Project is located before excavating.

3. Demolish and completely remove from site existing underground utilities indicated to be removed. Coordinate with utility companies to shut off services if lines are active.

B. Existing Utilities: Locate existing underground utilities in areas of excavation work. If utilities are indicated to remain in place, provide adequate means of support and protection during earthwork operation.

1. Should uncharted, or incorrectly charted, piping or other utilities be encountered during excavation, consult utility owner immediately for directions. Cooperate with Owner and utility companies in keeping respective services and facilities in operation. Repair damaged utilities to satisfaction of utility owner.

2. Coordinate relocation of the utility with the utility company and the Owner as necessary.

C. Protection of Persons and Property: Barricade open excavations occurring as part of this work and post with warning lights.

1. Operate warning lights as recommenced by authorities having jurisdiction.

2. Protect utilities, sidewalks, pavements, and other facilities from damage caused by settlement, lateral movement, undermining, washout, and other hazards created by earthwork operations.

3. Perform excavation by hand within drip line of large trees to remain. Protect root systems from damage or dry out to the greatest extent possible. Maintain moist condition for root system, and cover exposed roots with moistened burlap.

PART 2 - PRODUCTS

2.1 SOIL MATERIALS

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

Comprehensive Engineering 31 20 00-4 Earthwork

B. Satisfactory Soils: ASTM D 2487 Soil Classification Groups GW, GP, GM, SW, SP, and SM , or a combination of these groups; free of rock or gravel larger than 2 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 D 2487 or a combination of these groups.

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

D. Subbase Material (beneath concrete walks and pavements, base course): Naturally or artificially graded mixture of clean compacted sand meeting MDOT Class II or ASTM D-2487 Group SW or SP.

E. Base Course (Beneath Asphalt Paving): Mixture of stabilized processed road gravel meeting

MDOT Class 21AA dense graded aggregate or equivalent.

F. Engineered Fill: Naturally or artificially graded mixture of clean compacted sand meeting

MDOT Class II or ASTM D-2487 Group SW or SP.

G. Bedding Course (Beneath Piping): Naturally or artificially graded mixture of clean compacted sand meeting MDOT Class II or ASTM D-2487 Group SW or SP.

H. Sand: ASTM C 33; fine aggregate, natural, or manufactured sand, meeting MDOT Class II.

I. Impervious Fill: Clayey gravel and sand mixture capable of compacting to a dense state.

L. Topsoil: Soil with high organic content that are not suitable for backfill because of their low compressive strength characteristics.

2.2 PERFORATED DRAINAGE PIPE (DRAIN TILE)

A. Pipe and Fittings: Perforated and corrugated, molded from HDPE complying with ASTM D

3350, with fittings and geotextile filter fabric jacket. Size as indicated.

B. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, but are not limited to:

1. Advanced Drainage Systems, Inc.

2.3 ACCESSORIES

A. Warning Tape: Acid- and alkali-resistant polyethylene film warning tape manufactured for marking and identifying underground utilities, 6 inches (150 mm) wide and 4 mils (0.1 mm) thick, continuously inscribed with a description of the utility; colored as follows:

B. Detectable Warning Tape: Acid- and alkali-resistant polyethylene film warning tape manufactured for marking and identifying underground utilities, a minimum of 6 inches (150

mm) wide and 4 mils (0.1 mm) thick, continuously inscribed with a description of the utility, with metallic core encased in a protective jacket for corrosion protection, detectable by metal detector when tape is buried up to 30 inches (750 mm) deep; colored as follows:

1. Red: Electric.

2. Yellow: Gas, oil, steam, and dangerous materials.

3. Orange: Telephone and other communications.

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4. Blue: Water systems.

5. Green: Sewer systems.

C. Erosion Control Blanket: 1.5lb. photodegradable, polypropylene top and bottom net, 100% straw fiber matrix. Manufactured by North American Green or approved other.

D. Cellular Confinement System: Cellular confinement system shall be Polyethylene Stabilized with Carbon Black as manufactured by Presto Geosystems or approved equal.

3.1 PREPARATION

A. Protect structures, utilities, fences, sidewalks, pavements, curbs, benchmarks, survey control points and other facilities from damage caused by settlement, lateral movement, undermining, washout, and other hazards created by earthwork operations.

B. Prepare subgrade for earthwork operations including removal of vegetation, topsoil, debris, obstructions, and deleterious materials from ground surface.

C. Protect and maintain erosion and sedimentation controls during earthwork operations.

D. Provide protective insulating materials to protect subgrades and foundation soils against freezing temperatures or frost.

E. Protect plants, trees, root structures, lawn and other features to remain as a portion of the landscaping. Replace damaged or destroyed elements.

F. Excavation of all types shall be in accordance with the current OSHA excavation and trench safety standards. Construction site safety is the sole responsibly of the contractor.

3.2 STABILITY OF EXCAVATIONS

A. General. Comply with local codes, ordinances, and requirements of agencies having jurisdiction including requirements of soil erosion and sedimentation control permits.

B. Excavation stability and support is the sole responsibility of the contractor. Maintain sides and slopes of excavations in safe condition until completion of backfilling. Provide temporary shoring and bracing where sloping is not possible due to space restrictions or stability of material excavated.

C. Excavation Support and Protection: Design, furnish, install, and maintain excavation support and protection system capable of supporting excavation sidewalls to resist soil pressure, hydrostatic pressure, and construction loads. Install without damaging existing buildings, pavements, and other improvements adjacent to construction.

3.3 DEWATERING

A. Prevent surface water and ground water from entering excavations, from ponding on prepared subgrades, and from flooding Project site and surrounding area. Perform work in accordance with the soil erosion and sedimentation control permits.

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

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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.

C. Prevent localized surface water and groundwater from entering excavations by using shallow.

3.4 EXPLOSIVES

A. Explosives: Do not use explosives

3.5 EXCAVATION, GENERAL

A. Unclassified Excavation: Excavate to subgrade elevations regardless of the character of surface and subsurface conditions encountered. If excavated materials intended for fill and backfill include unsatisfactory soil materials and rock, replace with satisfactory soil materials.

3.6 EXCAVATION FOR STRUCTURES

A. Excavate to indicated elevations and dimensions within a tolerance of plus or minus 1 inch (25 mm). If applicable, extend excavations a sufficient distance from structures for placing and removing concrete formwork, for installing services and other construction, and for inspections.

1. Excavation for Underground Tanks, and Mechanical or Electrical Utility Structures:

Excavate to elevations and dimensions indicated within a tolerance of plus or minus 1 inch (25 mm). Do not disturb bottom of excavations intended as bearing surfaces.

3.7 EXCAVATION FOR WALKS AND PAVEMENTS

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

3.8 EXCAVATION FOR UTILITY TRENCHES

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

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

B. Excavate trenches to uniform widths to provide a minimum 6" clearance on each side of pipe or conduit. Excavate trench walls vertically from trench bottom to 12 inches (300 mm) higher than top of pipe or conduit, unless otherwise indicated.

C. Trench Bottoms: Excavate trenches 4 inches (100 mm) deeper than bottom of pipe elevation to allow for bedding course unless indicated otherwise. Hand excavate for bell of pipe.

1. Excavate trenches 6 inches (150 mm) deeper than elevation required in rock or other unyielding bearing material to allow for bedding course.

3.9 SUBGRADE INSPECTION

A. Notify Testing Agency when excavations have reached required subgrade.

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

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C. Proof-roll subgrade below the building slabs and pavements with heavy pneumatic-tired equipment to identify soft pockets and areas of excess yielding. Do not proof-roll wet or saturated subgrades.

1. Excavate soft spots, unsatisfactory soils, and areas of excessive pumping or rutting, as determined by Testing Agency, and replace with compacted backfill or fill as directed.

D. Authorized additional excavation and replacement material will be paid for according to Contract provisions for unit prices or changes in the Work.

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

3.10 UNAUTHORIZED EXCAVATION

A. Fill unauthorized excavation under foundations or wall footings by extending bottom elevation of concrete foundation or footing to excavation bottom, without altering top elevation. Engineered fill or lean concrete fill, with 28-day compressive strength of 2500 psi (17.2 MPa), may be used when approved in writing.

3.11 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. Stockpile soil materials away from edge of excavations.

1. Stockpile stripped topsoil as needed for the restoration of the future lawn areas in a separate area.

2. Locate and retain soil materials away from edge of excavations. Do not store within drip line of trees indicated to remain.

3. Dispose of excess excavated soil material, excess topsoil, and materials not acceptable for use as backfill or fill of site at not additional cost to Owner.

3.12 BACKFILL

A. Using satisfactory soils, place and compact backfill in excavations promptly after completion of construction below finish grade including, where applicable, subdrainage, dampproofing, waterproofing, and perimeter insulation. Complete testing and inspecting underground utilities and removing trash and debris before placing backfill.

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

3.13 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 trenches excavated under footings and within 12 inches (450 mm) of bottom of footings with satisfactory soil; fill with concrete to elevation of bottom of footings. Concrete is specified in Division 3.

D. Provide 4-inch- (100-mm)- thick, concrete-base slab support for piping or conduit less than 30 inches (750 mm) below surface of roadways. After installing and testing, completely encase

Comprehensive Engineering 31 20 00-8 Earthwork piping or conduit in a minimum of 4 inches (100 mm) of concrete before backfilling or placing roadway subbase.

E. Place and compact initial backfill, free of particles larger than 1 inch (25 mm) in any dimension, to a height of 12 inches (300 mm) over the utility pipe or conduit.

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

F. Backfill voids with satisfactory soil while installing and removing shoring and bracing.

G. Place and compact final backfill of satisfactory soil to final subgrade elevation.

H. Install warning tape directly above utilities, 12 inches (300 mm) below finished grade, except 6 inches (150 mm) below subgrade under pavements and slabs.

3.14 SOIL FILL

A. Plow, scarify, bench, or break up sloped surfaces 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 soil material.

2. Under walks and pavements, use subbase material, use engineered fill.

3. Under steps and ramps, use engineered fill.

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

3.15 SOIL MOISTURE CONTROL

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

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 specified dry unit weight.

3.16 COMPACTION OF SOIL BACKFILLS AND FILLS

A. Place backfill and fill soil materials in layers not more than 8 inches (200 mm) 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 maximum dry density in accordance with the modified proctor test per ASTM D1557:

1. Under structures, building slabs, steps, and pavements, or behind basement walls and foundation walls, scarify and recompact top 12 inches (300 mm) of existing subgrade and each layer of backfill or fill soil material at 95 percent.

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2. Under walkways, scarify and recompact top 6 inches (150 mm) below subgrade and compact each layer of backfill or fill soil material at 95 percent.

3. Under lawn or unpaved areas, scarify and recompact top 6 inches (150 mm) below subgrade and compact each layer of backfill or fill soil material at 85 percent.

4. For utility trenches, compact each layer backfill soil material at 95 percent under unpaved and under paved areas and walls.

3.17 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 Grading: Slope grades to direct water away from buildings and to prevent ponding. Finish subgrades to required elevations within the following tolerances:

1. Lawn or Unpaved Areas: Plus or minus 1 inch (25 mm).

2. Walks: Plus or minus 1 inch (25 mm).

3. Pavements: Plus or minus 2 inch (13 mm).

3.18 SUBBASE AND BASE COURSES

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

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

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

2. Compact subbase and base course at optimum moisture content to required grades, lines, cross sections, and thickness to not less than 98 percent of maximum dry density in accordance with the modified proctor test per ASTM D 1557.

C. Pavement Shoulders: Place shoulders along edges of subbase and base course to prevent lateral movement. Construct shoulders, at least 12 inches (300 mm) wide, of satisfactory soil materials and compact simultaneously with each subbase and base layer to not less than 98 percent of maximum dry density in accordance with the modified proctor test per ASTM D 1557.

D. Grade Control: During construction, maintain lines and grades including crown and cross-slope of subbase course.

E. Placing: Place subbase course material on prepared subgrade in layers of uniform thickness, conforming to indicated cross-section and thickness. Maintain optimum moisture content for compacting subbase material during placement operations.

1. When compacted subbase course is indicated to be 6 inches thick or less, place material in single layer. When indicated to be more than 6 inches thick, place material in equal layers, except no single layer more than 6 inches or less than 3 inches in thickness when compacted.

3.20 FIELD QUALITY CONTROL

A. Testing Agency: A qualified independent geotechnical engineering testing agency shall perform field quality-control testing.

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B. Allow testing agency to inspect and test subgrades and each fill or backfill layer. Proceed with subsequent earthwork only after test results for previously completed work comply with requirements.

C. Footing Subgrade: At footing subgrades, at least one test of each soil stratum will be performed to verify design bearing capacities.