24-43 Forest Hills Nature Center Project Manual.pdf

4787 Tartan Lane • Holt, Michigan 48842-1935

RogerAIA@comcast.net (517) 694-0011 email phone

D E S I G N I N G A B E T T E R F U T U R E

Member International Code Council U.S. Green Building Council

American Institute of Architects Association of Licensed Architects National Fire Protection Association

National Frame Builders Association Construction Specifications Institute

National Council of Architectural Registration Boards

Roger L. Donaldson, AIA P.L.C.Roger L. Donaldson, AIA P.L.C.Roger L. Donaldson, AIA P.L.C.Roger L. Donaldson, AIA P.L.C.

ArchitectArchitectArchitectArchitect

Gratiot-Isabella RESD

NEW NATURE CENTER

FOREST HILLS NATURE CENTER

11297 N. RICH ROAD

ALMA, MICHIGAN 48801

PROJECT ARCHITECT

ROGER L. DONALDSON, AIA P.L.C.

4787 TARTAN LANE

HOLT, MI 48842-1935

(517) 694-0011 PHONE

PROJECT #24-43 - GRATIOT-ISABELLA RESD

NEW NATURE CENTER

ENGINEER

MATRIX CONSULTING ENGINEERS, INC

544 CHERBOURG

LANSING, MI 48917

(517) 487-2511 PHONE

CIVIL ENGINEER

KEBS, INC

2116 HASLETT RD

HASLETT, MI 48840

(517) 339-1014 PHONE

APRIL 24, 2026

GRATIOT-ISABELLA RESD

NEW NATURE CENTER - FOREST HILLS NATURE CENTER

ROGER L DONALDSON, AIA P.L.C.

PROJECT #24-43 00 01 10- 1

SECTION 00 01 10

TABLE OF CONTENTS

INTRODUCTORY INFORMATION

SECTION 00 01 10 TABLE OF CONTENTS

SECTION 00 01 15 LIST OF DRAWINGS

BIDDING REQUIREMENTS

SECTION 00 11 16 INVITATION TO BID

SECTION 00 21 13 INSTRUCTIONS TO BIDDERS

SECTION 00 21 14 STATEMENT OF NO BID

SECTION 00 31 32 GEOTECHNICAL DATA

SECTION 00 41 13 PROPOSAL FORM

SECTION 00 43 23 ALTERNATES

SECTION 00 43 24 AFFIDAVIT OF BIDDER – FAMILIAL RELATIONSHIPS FORM

SECTION 00 43 25 AFFIDAVIT OF BIDDER – COMPLIANCE WITH SCHOOL SAFETY INITIATIVE LEGISLATION

SECTION 00 43 26 AFFIDAVIT OF BIDDER – IRAN ECONOMIC SANCTIONS ACT (MICHIGAN PUBLIC ACT 517 OF 2012)

SECTION 00 52 23 AIA A101-2007 CONTRACT BETWEEN OWNER & CONTRACTOR

SECTION 00 52 24 AIA A101-2017 EXHIBIT A

SECTION 00 72 13 AIA A201-2007 GENERAL CONDITIONS OF THE CONTRACT

SECTION 00 73 13 GENERAL REQUIREMENTS

DIVISION 1 GENERAL REQUIREMENTS

SECTION 01 11 13 SUMMARY OF THE WORK

SECTION 01 22 00 UNIT PRICES

SECTION 01 23 00 ALTERNATES, “OR EQUAL” CLAUSE

SECTION 01 25 13 ALTERATION PROJECT PROCEDURES

SECTION 01 26 57 CHANGE ORDER PROCEDURES

SECTION 01 29 73 CONTRACT CONSIDERATIONS

SECTION 01 29 76 APPLICATIONS FOR PAYMENT

SECTION 01 31 13 COORDINATION AND MEETINGS

SECTION 01 32 16 PROGRESS SCHEDULE

SECTION 01 33 00 SUBMITTALS

SECTION 01 33 23 SHOP DRAWINGS, PRODUCT DATA AND SAMPLES

SECTION 01 50 00 TEMPORARY CONTROLS

SECTION 01 60 00 MATERIAL AND EQUIPMENT

SECTION 01 70 00 CONTRACT CLOSEOUT

SECTION 01 73 29 CUTTING AND PATCHING

DIVISION 2: EXISTING CONDITIONS

SECTION 02 41 19 – SELECTIVE DEMOLITION

DIVISION 3: CONCRETE

SECTION 03 20 00 CONCRETE REINFORCING

SECTION 03 30 00 CAST IN PLACE CONCRETE

SECTION 03 41 00 PRECASE STRUCTURAL CONCRETE

DIVISION 41: MASONRY

SECTION 04 20 00 UNIT MASONRY

SECTION 04 43 13 ADHERED STONE MASONRY VENEER

DIVISION 5: METALS

SECTION 05 05 00 METAL FABRICATIONS

SECTION 05 05 14 HOT DIP GALVANIZING GENERAL

SECTION 05 12 00 STRUCTURAL STEEL FRAMING

SECTION 00 01 10

TABLE OF CONTENTS

GRATIOT-ISABELLA RESD

NEW NATURE CENTER - FOREST HILLS NATURE CENTER

ROGER L DONALDSON, AIA P.L.C.

PROJECT #24-43 00 01 10- 2

DIVISION 6: WOOD, PLASTICS, AND COMPOSITES

SECTION 06 10 00 ROUGH CARPENTRY

SECTION 06 10 53 MISCELLOUS ROUGH CARPENTRY

SECTION 06 18 00 PREFABRICATED WOOD BEAMS AND JOISTS

SECTION 06 20 00 FINISH CARPENTRY

SECTION 06 41 16 PLASTIC-LAMINATE-CLAD ARCHITECTURAL CABINETS

DIVISION 7: THERMAL AND MOISTURE PROTECTION

SECTION 07 31 13 ASPHALT SHINGLES

SECTION 07 46 46 FIBER CEMENT SIDING, SOFFIT, AND TRIM

SECTION 07 60 00 FLASHING AND SHEET METAL

SECTION 07 96 00 JOINT SEALERS

DIVISION 8 DOORS AND WINDOWS

SECTION 08 01 13 STANDARD STEEL DOORS AND FRAMES

SECTION 08 14 16 FLUSH WOOD DOORS

SECTION 08 31 00 ACCESS DOORS AND PANELS

SECTION 08 41 00 ALUMINUM FRAME ENTRANCES

SECTION 08 42 00 ALUMINUM GLASS DOORS

SECTION 08 71 00 FINISH HARDWARE

SECTION 08 80 00 GLASS AND GLAZING

DIVISION 9 FINISHES

SECTION 09 21 16 GYPSUM BOARD

SECTION 09 65 13 RESILIENT TLE ACCESSORIES

SECTION 09 65 16 RESILIENT TLE FLOORING

SECTION 09 91 00 PAINTING

DIVISION 10 ACCESSORIES

SECTION 10 14 00 SIGNAGE

SECTION 10 28 13 TOILET ACCESSORIES

DIVISION 12 FURNISHING

DIVISION 21 - FIRE SUPPRESSION

SECTION 212200 CLEAN-AGENT FIRE-EXTINGUISHING SYSTEM

DIVISION 22 - PLUMBING

SECTION 220500 – COMMON WORK RESULTS FOR PLUMBING

SECTION 220523 GENERAL-DUTY VALVES FOR PLUMBING PIPING

SECTION 220529 HANGERS AND SUPPORTS FOR PLUMBING PIPING AND EQUIPMENT

SECTION 220553 IDENTIFICATION FOR PLUMBING PIPING AND EQUIPMENT

SECTION 220700 PLUMBING INSULATION

SECTION 221005 PLUMBING PIPING

SECTION 221006 PLUMBING PIPING SPECIALTIES

SECTION 221123 DOMESTIC WATER PUMPS

SECTION 223000 PLUMBING EQUIPMENT

SECTION 224000 PLUMBING FIXTURES

DIVISION 23 - HEATING, VENTILATING, AND AIR-CONDITIONING (HVAC)

SECTION 230500 COMMON WORK RESULTS FOR HVAC

SECTION 230516 EXPANSION FITTINGS AND LOOPS FOR HVAC PIPING

SECTION 230519 METERS AND GAUGES FOR HVAC PIPING

SECTION 230523 GENERAL-DUTY VALVES FOR HVAC PIPING

SECTION 230529 HANGERS AND SUPPORTS FOR HVAC PIPING AND EQUIPMENT

GRATIOT-ISABELLA RESD

NEW NATURE CENTER - FOREST HILLS NATURE CENTER

ROGER L DONALDSON, AIA P.L.C.

PROJECT #24-43 00 01 10- 3

SECTION 230553 IDENTIFICATION FOR HVAC PIPING AND EQUIPMENT

SECTION 230593 TESTING, ADJUSTING, AND BALANCING FOR HVAC

SECTION 230700 HVAC INSULATION

SECTION 230800 COMMISSIONING OF HVAC

SECTION 230801 VERIFICATION AND TESTING OF HVAC, PLUMBING AND ELECTRICAL

SECTION 230913 INSTRUMENTATION AND CONTROL DEVICES FOR HVAC

SECTION 230923 DIRECT-DIGITAL CONTROL SYSTEM FOR HVAC

SECTION 230993 – SEQUENCE OF OPERATIONS FOR HVAC CONTROLS

SECTION 231123 FACILITY NATURAL-GAS PIPING

SECTION 232113 HYDRONIC PIPING

SECTION 232114 HYDRONIC SPECIALTIES

SECTION 232123 HYDRONIC PUMPS

SECTION 232300 REFRIGERANT PIPING

SECTION 232500 HVAC WATER TREATMENT

SECTION 233100 HVAC DUCTS AND CASINGS

SECTION 233300 AIR DUCT ACCESSORIES

SECTION 233600 AIR TERMINAL UNITS

SECTION 233700 AIR OUTLETS AND INLETS

SECTION 235400 FURNACES

SECTION 235700 HEAT EXCHANGERS FOR HVAC

SECTION 236313 AIR COOLED REFRIGERANT CONDENSERS

SECTION 237416 PACKAGED ROOFTOP AIR-CONDITIONING UNITS

SECTION 238146 WATER-SOURCE UNITARY HEAT PUMPS

SECTION 238200 CONVECTION HEATING AND COOLING UNITS

SECTION 238300 RADIANT HEATING AND COOLING UNITS

DIVISION 26 - ELECTRICAL

SECTION 260010 BASIC ELECTRICAL REQUIREMENTS

SECTION 260500 COMMON WORK RESULTS FOR ELECTRICAL

SECTION 260519 LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES

SECTION 260526 GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS

SECTION 260529 HANGERS AND SUPPORTS FOR ELECTRICAL SYSTEMS

SECTION 260533.13 CONDUIT FOR ELECTRICAL SYSTEMS

SECTION 260533.16 BOXES FOR ELECTRICAL SYSTEMS

SECTION 260553 IDENTIFICATION FOR ELECTRICAL SYSTEMS

SECTION 260583 WIRING CONNECTIONS

SECTION 260923 LIGHTING CONTROL DEVICES

SECTION 262100 LOW-VOLTAGE ELECTRICAL SERVICE ENTRANCE

SECTION 262416 PANELBOARDS

SECTION 262726 WIRING DEVICES

SECTION 262813 FUSES

SECTION 262816.16 ENCLOSED SWITCHES

SECTION 262923 VARIABLE-FREQUENCY MOTOR CONTROLLERS

SECTION 263213.13 DIESEL-ENGINE-DRIVEN GENERATOR SETS

SECTION 263623.16 AUTOMATIC/NONAUTOMATIC TRANSFER SWITCHES - SCHNEIDER ELECTRIC ASCO 300

SECTION 26430002 SURGE PROTECTIVE DEVICE

SECTION 265100 INTERIOR LIGHTING

SECTION 265600 EXTERIOR LIGHTING

DIVISION 28 - ELECTRONIC SAFETY AND SECURITY

SECTION 281000 ACCESS CONTROL

SECTION 284621.11 ADDRESSABLE FIRE-ALARM SYSTEMS

GRATIOT-ISABELLA RESD

NEW NATURE CENTER - FOREST HILLS NATURE CENTER

ROGER L DONALDSON, AIA P.L.C.

PROJECT #24-43 00 01 10- 4

DIVISION 32: EXTERIOR IMPROVEMENTS

SECTION 31 20 00 EARTH MOVING

SECTION 33 31 00 SANITARY SEWER SYSTEM

SECTION 33 32 00 GRINDER PUMP SYSTEM

END OF SECTION 00 01 10

NEW NATURE CENTER - FOREST HILLS NATURRE CENTER

ROGER L DONALDSON, AIA P.L.C.

PROJECT #24-43 00 01 15-1

SECTION 00 01 15

INDEX OF DRAWINGS

NEW NATURE CENTER

GRATIOT-ISABELLA RESD

FOREST HILLS NATURRE CENTER

ARCHITECTURAL

G 0.1 TITLE SHEET, CODE DATA, PROJECT INFORMATION, DRAWING INDEX, & SITE PLAN

A 1.1 FLOOR PLAN - PHASE 1, PLAN NOTES & DETAILS

A 1.2 FLOOR PLAN - PHASE 2, PLAN NOTES & DETAILS

A 1.3 ROOF PLAN - PHASE 1, ROOF PLAN NOTES & DETAILS

A 1.4 ROOF PLAN - PHASE 2, ROOF PLAN NOTES & DETAILS

A 1.11 REFLECTED CEILING FLOOR PLAN - PHASE 1, REFLECTED CEILING PLAN NOTES & DETAILS

A 1.12 REFLECTED CEILING FLOOR PLAN - PHASE 2, REFLECTED CEILING PLAN NOTES & DETAILS

A 2.1 EXTERIOR ELEVATIONS - PHASE 1

A 2.2 EXTERIOR ELEVATIONS - PHASE 2

A 3.1 BUILDING SECTIONS

A 3.2 BUILDING SECTIONS

A 3.3 BUILDING SECTIONS

A 4.1 ENLARGED TOILET ROOM PLANS, ELEVATIONS & DETAILS

A 4.2 ROOM FINISH SCHEDULE, DOOR FINISH SCHEDULE, HARDWARE SCHEDULE

A 5.1 CONSTRUCTION DETAILS

S 1.1 FOUNDATION PLAN - PHASE 1, PLAN NOTES & DETAILS

S 1.2 FOUNDATION PLAN - PHASE 2, PLAN NOTES & DETAILS

S 1.3 ROOF FRAMING PLAN - PHASE 1, ROOF FRAMING PLAN NOTES & DETAILS

S 1.4 ROOF FRAMING PLAN - PHASE 2, ROOF FRAMING PLAN NOTES & DETAILS

S 5.1 FRAMING DETAILS

SITE PLAN & CIVIL ENGINEERING

1 SITE AND UTILITY Ph. 1 PLAN

2 EXISTING CONDTIONS PLAN

3 GRADING PLAN PH.1 PLAN

4 SOIL EROSION CONTROL PLAN

5 LANDSCAPE PLAN

6 SITE AND UTILITY PH. 2 PLAN

7 GRADING PH. 2 PLAN

8 LANDSCAPE PHASE 2 PLAN

9 DETAILS

CIVIL ENGINEERING (SEPTIC)

C-400 SITE PLAN - SANITARY AND TOWER DRAIN

C-800 CIVIL DETAILS

MECHANICAL

M 100 MECHANICAL - SYMBOLS, NOTES, AND ABBREVIATIONS

M-400 FLOOR PLAN - MECHANICAL NEW - PHASE 1

M-600 BELOW FLOOR PLAN - PIPING NEW - PHASE 1

M-601 FLOOR PLAN - PIPING NEW - PHASE 1

M-700 FLOOR PLAN - MECHANICAL & PIPING NEW - PHASE 2

M-701 MECHANICAL ENLARGEMENT

M-702 MECHANICAL ENLARGEMENT

M-800 MECHANICAL HYDROINIC DETAIL

M-801 MECHANICAL DETAILS

M-802 MECHANICAL DETAILS

M-803 MECHANICAL CONTROLS

M-900 MECHANICAL SCHEDULES

M-901 MECHANICAL SCHEDULES

SECTION 00 01 15

INDEX OF DRAWINGS

GRATIOT-ISABELLA RESD

NEW NATURE CENTER - FOREST HILLS NATURRE CENTER

ROGER L DONALDSON, AIA P.L.C.

PROJECT #24-43 00 01 15-2

PLUMBING

P 100 PLUMBING - SYMBOLS, NOTES, AND ABBREVIATIONS

P 400 BELOW FLOOR PLAN - PLUMBING NEW - PHASE 1

P 401 FLOOR PLAN - PLUMBING NEW - PHASE 1

P-402 FLOOR PLAN - PLUMBING NEW - PHASE 2

P-700 PLUMBING ENLARGEMENTS

P-701 PLUMBING ENLARGEMENTS

P-900 PLUMBING SCHEDULES

ELECTRICAL

E-100 ELECTRICAL - SYMBOLS, NOTES, AND ABBREVIATIONS

E-400 FLOOR PLAN - LIGHTING NEW

E-401 ELECTRICAL EMERGENCY PHOTOMETRICS

E-402 ELECTRICAL - COMCHECK REPORTS

E-500 FLOOR PLAN - POWER NEW

E-600 ELECTRICAL RISER DIAGRAM

E-700 ENLARGED FLOOR PLAN - MECH. ROOM - POWER NEW

E-800 ELECTRICAL DETAILS

E-900 ELECTRICAL PANEL SCHEDULES

END OF SECTION 00 01 15

SECTION 00 01 15

INDEX OF DRAWINGS

GRATIOT-ISABELLA RESD

NEW NATURE CENTER - FOREST HILLS NATURRE CENTER

ROGER L DONALDSON, AIA P.L.C.

PROJECT #24-43 00 01 15-3

THIS PAGE

BLANK

ROGER L DONALDSON, AIA P.L.C.

PROJECT #24-43 00 01 10- 1

SECTION 00 01 10

INVITATION TO BID

PROJECT

FOREST HILLS NATURE CENTER

GRATIOT-ISABELLA RESD

FOREST HILLS NATURE CENTER

11297 N. RICH RD

ALMA, MI 48801

OWNER

Gratiot -Isabella RESD

1131 E. Center St.

Ithaca, Michigan 48847.

ARCHITECT

Roger L. Donaldson, AIA P.L.C.

4787 Tartan Lane

Holt, Michigan 48842

(517) 694-0011

Email: RogerAIA@comcast.net

Project New Nature Center - #24-43 Gratiot-Isabella RESD - Forest Hills Nature Center

ENGINEER

Matrix Consulting Engineers Inc.

544 Cherbourg

Lansing, MI 48917

(517) 487-2511

SITE PLAN & CIVIL ENGINEERING

KEBS, INC.

2116 Haslett Rd

Haslett, MI 48840

(517) 333-1014

SCOPE OF WORK:

DESCRIPTION OF PROJECT:

See detailed description in Section 01 11 13- Summary of Work.

24-43 Gratiot-Isabella RESD - Forest Hills Nature Center: New Education Nature Facility of approximately 12,000 square feet.

Conventional Wood Framed Structure with Wood Trusses, Metal Roofing, Composite Siding. Mechanical System using Propone

Fuel, Heat Pump, Cooling Tower, In Floor Heating, Snow Melt System, Typical Plumbing System with Septic for Sanitary.

Electrical Lighting, Power Backup Generator and Fire Alarm System.

PRE-BID MEETING:

24-43 Gratiot-Isabella RESD - Forest Hills Nature Center:: A MANDATORY Pre-Bid meeting will be held at:

Forest Hills Nature Center, 11297 Rich Road, Alma, Michigan 48801, on Wednesday May 6, 2026, 10:00 AM EDT.

ACCESS TO PROJECT AREA:

During the Pre Bid meeting, an additional on site visit date and time may be determined.

TYPE OF BIDS REQUESTED

Sealed proposals for construction work of all trades for the project will be received.

TIME AND PLACE

Sealed proposals will be received at:

Gratiot -Isabella RESD, 1131 E. Center St., Ithaca, Michigan 48847, on Wednesday May 20, 2026, 2:00 PM EDT.

Bids will be opened and read aloud. Bids received after the time and date for receipt of Bids will be returned unopened.

INVITATION TO BID

GRATIOT-ISABELLA RESD

NEW NATURE CENTER - FOREST HILLS NATURE CENTER

ROGER L DONALDSON, AIA P.L.C.

PROJECT #24-43 00 01 10- 2

The envelope shall be addressed to the party receiving the Bids and shall be identified with the Project name, the Bidder's name and address and, if applicable, the designated portion of the Work for which the Bid is submitted. If the Bid is sent by mail the sealed envelope shall be enclosed in a separate mailing envelope with the same notation above on the outer envelope.

No oral interpretations will be made. Interpretations must be made in writing and delivered to the Architect at least seven (7) working days prior to bid opening. Interpretations will be made in writing and furnished to prospective bidders present at the pre-bid inspection meeting.

Each bidder is responsible for making their own measurements, for acquainting themselves with the specification documents, and for inspecting the work site and conditions.

PROPOSAL GUARANTEE

Each proposal must be accompanied by a proposal guarantee in an amount equal to five percent (5%) of the basic proposal. Guarantee shall be in the form of a certified check or bid bond executed by an approved surety company, made payable to the Gratiot-Isabella

RESD. Proposal guarantee shall run for a period of Ninety (90) days.

CONTRACT SECURITY

The successful bidder may be required to furnish a "Performance Bond" and a "Labor and Material Payment Bond", each bond in the amount of 100% of his contract, as required in the "Instructions to Bidders". Provide cost for Bonds as an Alternate Bid item were provided on the proposal form.

RIGHTS RESERVED BY OWNER

The owner reserves the right to reject any or all proposals and to waive any irregularities in bidding, or to accept the lowest responsible proposal(s) that in the opinion of the owner will serve the best interest of the owner. The owner will not be obligated to accept the lowest proposal. The owner further reserves the right to approve all subcontractors.

WITHDRAWAL OF PROPOSALS

No proposals may be withdrawn for a period of Ninety (90) days after the receipt of proposals.

END OF SECTION 00 01 10

ROGER L DONALDSON, AIA P.L.C.

PROJECT #24-43 00 21 13- 1

SECTION 00 21 13

INSTRUCTION TO BIDDERS

DEFINITIONS

l. Bidding Documents include the Invitation to Bid, Instructions to Bidders, the bid form, other sample bidding and contract forms and the proposed Contract Documents including any Addenda issued prior to receipt of bids. The Contract Documents proposed for the Work consists of the Owner-Contractor Agreement, the Conditions of the Contract (General, Supplementary and other

Conditions), the Drawings, the Specifications and all Addenda issued prior to and all Modifications issued after execution of the

Contract.

2. All definitions set forth in the General Conditions of the Contract for Construction, AIA Document A201, or in other Contract

Documents are applicable to the Bidding Documents.

3. Addenda are written or graphic instruments issued by the Architect prior to the execution of the Contracts which modify or interpret the Bidding Documents by addition, deletion, clarifications or corrections.

4. A Bid is a complete and properly signed proposal to do the Work or designated portion thereof for the sums stipulated therein, submitted in accordance with the Bidding Documents.

5. The Base Bid is the sum stated in the Bid for which the Bidder offers to perform the Work described in the Bidding Documents as the base, to which work may be added or from which work may be deleted for sums stated in Alternate Bids.

6. An Alternate Bid (or Alternate) is an amount stated in the Bid to be added to or deducted from the amount of the Base Bid if the corresponding change in the Work, as described in the Bidding Documents, is accepted.

7. A Unit Price is an amount stated in the Bid as a price per unit of measurement for materials or services as described in the

Bidding Documents or in the proposed Contract Documents.

8. A Bidder is a person or entity who submits a Bid.

9. A Sub-bidder is a person or entity who submits a bid to a Bidder for materials or labor for a portion of the Work.

BIDDER'S REPRESENTATION

l. Each Bidder by making his Bid represents that:

A. He has read and understands the Bidding Documents and his Bid is made in accordance therewith.

B. He has visited the site, has familiarized himself with the local conditions under which the Work is to be performed and has correlated his observations with the requirements of the proposed Contract Documents.

C. His Bid is based upon the materials, systems and equipment required by the Bidding Documents without exception.

D. Bidder shall not rely upon scaling of drawings since printing processes and other conditions may vary the scale of the drawings.

BIDDING DOCUMENTS

l. Bidders may obtain complete sets of the Bidding Documents from the issuing office designated in the Invitation to Bid in the number and for the deposit sum, if any, stated therein.

2. Bidders shall use complete sets of Bidding Documents in preparing Bids; neither the Owner nor the Architect assume any responsibility for errors or misinterpretations resulting from the use of incomplete sets of Bidding Documents.

3. The Owner or the Architect in making copies of the Bidding Documents available on the above terms do so only for the purpose of obtaining Bids on the Work and do not confer a license or grant for any other use.

4. Bidders and Sub-bidders shall promptly notify the Architect of any ambiguity, inconsistency or error which they may discover upon examination of the Bidding Documents or of the site and local conditions.

5. Bidders and Sub-bidders requiring clarification or interpretation of the Bidding Documents shall make a written to the Architect at least seven (7) business days prior to the date for receipt of Bids. All written requests must be received prior to seven business days before bid due date.

Phone calls with questions will not be accepted or returned.

6. Any interpretation, correction or change of the Bidding Documents will be made by Addendum. Interpretations, corrections or changes of the Bidding Documents made in any other manner will not be binding, and Bidders shall not rely upon such interpretations, corrections and changes.

7. No substitution will be considered prior to receipt of Bids unless a written request for approval has been received by the

Architect at least seven days prior to the date for receipt of Bids. Each such request shall include the name of the material or equipment for which it is to be substituted and a complete description of the proposed substitute including drawings, cuts, performance and test data and any other information necessary for an evaluation. A statement setting forth any changes in other

SECTION 00 21 13

INSTRUCTION TO BIDDERS

GRATIOT-ISABELLA RESD

NEW NATURE CENTER - FOREST HILLS NATURE CENTER

ROGER L DONALDSON, AIA P.L.C.

PROJECT #24-43 00 21 13- 2

materials, equipment or other Work that incorporation of the substitute would require shall be included. The burden of proof of the merit of the proposed substitute is upon the proposer. The Architect's decision of approval or disapproval of a proposed substitution shall be final.

7. If the Architect approves any proposed substitution prior to receipt of Bids, such approval will set forth in an Addendum.

Bidders shall not rely upon approvals made in any other manner.

8. No verbal or written correspondence will be responded to within 4 days of the Bid date other than to verify bid date and time and any issuance of Addenda.

9. No substitutions will be considered after the Contract award unless specifically provided in the Contract Documents.

10. Any variance from the specifications shall be fully explained in writing by the bidder and all prices quoted shall be on a unit price basis.

11. Addenda will be posted on State of Michigan SIGMA site.

12. Copies of Addenda will be made available for inspection wherever Bidding Documents are on file for that purpose.

13. No Addenda will be issued later than four days prior to the date for receipt of Bids except an Addendum withdrawing the request for Bids or one which includes postponement of the date for receipt of Bids.

14. Each Bidder shall ascertain prior to submitting his bid that he has received all Addenda issued, and he shall acknowledge their receipt in his Bid forms in Section 00 41 13.

BIDDING PROCEDURE

1. Bids shall be submitted on forms included with the Bidding Documents.

2. Bid shall be submitted in triplicate, three (3) copies of Proposal and required documentation.

3. All blanks on the bid form shall be filled in by typewriter or clearly manually in ink.

4. Where so indicated by the makeup of the bid forms, sums shall be expressed in both words and figures, and in case of discrepancy between the two, the amount written in words shall govern.

5. The signer of the Bid must initial any interlineations, alteration or erasure.

6. All requested Alternates and Unit Prices shall be bid. If no change in the Base Bid is required enter "No Change."

7. Each copy of the Bid shall include the legal name of the Bidder and a statement that the Bidder is a sole proprietor, a partnership, a corporation, or some other legal entity. Each copy shall be signed by the person or persons legally authorized to bind the

Bidder to a contract. A Bid by a corporation shall be further given the state of incorporation and have the corporate seal affixed.

A Bid submitted by an agent shall have a current power of attorney attached certifying the agent's authority to bind the Bidder.

8. If so stipulated in the Invitation to Bid, each Bid shall be accompanied by a bid security in the form and amount required pledging that the Bidder will enter into a contract with the Owner on the terms stated in his Bid and will, if required, furnish bonds covering the faithful performance of the Contract and the payment of all obligations arising thereunder. Should the

Bidder refuse to enter into such Contract or fail to furnish such bonds if required, the amount of the bid security shall be forfeited to the Owner as liquidated damages, not as a penalty.

9. A surety bond is required and shall be written on AIA Document A310-1970, Bid Bond, and the attorney-in-fact who executes the bond on behalf of the surety shall affix to the bond a certified and current copy of his power of attorney.

10. The Owner will have the right to retain the bid security of Bidders to whom an award is being considered until either (a) the

Contract has been executed and bonds, if required, have been furnished, or (b) the specified time has elapsed so that Bids may be withdrawn, or (c) all Bids have been rejected.

11. All three (3) copies of the Bid, the bid security, if any, and any other documents required to be submitted with the Bid shall be enclosed in a sealed Opaque Bid Envelope.

12. Bid forms are included in the Project Manual, “Section 00 41 13 Bid Proposaal”

13. Bids shall be deposited at the designated location prior to the time and date for receipt of Bids indicated in the Invitation to Bid, or any extension thereof made by Addendum. Bids received after the time and date for receipt of Bids will be returned unopened.

14. The Bidder shall assume full responsibility for timely delivery at the location designated for receipt of Bids.

15. Oral, telephonic or telegraphic Bids are invalid and will not receive consideration.

16. A Bid may not be modified, withdrawn or canceled by the Bidder during the stipulated time period following the time and date designated for the receipt of Bids, and each Bidder so agrees in submitting his Bid.

17. Prior to the time and date designated for receipt of Bids, any Bid submitted may be modified or withdrawn by notice to the party receiving Bids at the place designated for receipt of Bids. Such notice shall be in writing over the signature of the Bidder or by

GRATIOT-ISABELLA RESD

NEW NATURE CENTER - FOREST HILLS NATURE CENTER

ROGER L DONALDSON, AIA P.L.C.

PROJECT #24-43 00 21 13- 3

telegram; if by telegram, written confirmation over the signature of the Bidder shall be mailed and postmarked on or before the date and time set for receipt of Bids, and it shall be so worded so as not to reveal the amount of the original Bid.

18. Withdrawn Bids may be resubmitted up to the time designated for the receipt of Bids provided that they are then fully in conformance with these Instructions to Bidders.

19. Bid security, shall be in an amount sufficient for the Bid as modified or resubmitted.

CONSIDERATION OF BIDS

1. Unless stated otherwise in the Invitation to Bid, the properly identified Bids received on time will be opened publicly and will be read aloud. An abstract of the Base Bids and Alternate Bids, if any, may be made available to Bidders.

2. The Owner shall have the right to reject any or all Bids and to reject a Bid not accompanied by any required bid security or by other data required by the Bidding Documents, or to reject a Bid, which is in any way incomplete or irregular.

3. It is the intent of the Owner to award a Contract to one Bidder for each Bid Proposal, (but reserves the right to award to multiple contractors which may be in the best interest of the Owner), the decision of awards will be based on a combination of:

a. Contractor being able to complete project in a prompt period; and

b. being the lowest responsible bidder; and

c. Provided the Bid has been submitted in accordance with the requirements of the Bidding Documents and does not exceed the funds available. The Owner shall have the right to waive any informality or irregularity in any Bid or Bids received and to accept the Bid or Bids which, in his judgement, is in his own best interest.

4. The Owner shall have the right to accept Alternates in any order or combination, and to determine the low Bidder on the basis of the sum of the Base Bid and the Alternates accepted.

POST BID INFORMATION

1. Bidders to whom award of a Contract is under consideration shall submit to the Architect, upon request, a properly executed

AIA Document A305-1986, Contractor's Qualification Statement, unless such a Statement has been previously required and resubmitted as a prerequisite to the issuance of Bidding Documents.

2. The Bidder shall, within seven days of notification of selection for the award of a Contract for the Work, submit the following information to the Architect:

a. a designation of the Work to be performed by the Bidder with his own forces;

b. the proprietary names and the suppliers of principal items or systems of materials and equipment proposed for the

Work;

c. a list of names of the Subcontractors or other persons or entities (including those who are to furnish materials or equipment fabricated to a special design) proposed for the principal portions of the Work.

3. The Bidder will be required to establish to the satisfaction of the Architect and the Owner the reliability and responsibility of the persons or entities proposed to furnish and perform the Work described in the Bidding Documents.

4. Prior to the award of the Contract, the Architect will notify the Bidder in writing if either the Owner or the Architect, after due investigation, has reasonable objection to any such proposed person or entity. If the Owner or Architect has reasonable objection to any such proposed person or entity, the Bidder may, at his option, (1) withdraw his Bid, or (2) submit an acceptable substitute person or entity with an adjustment in his bid price to cover the difference in cost occasioned by such substitution.

The Owner may, at his discretion, accept the adjusted bid price or he may disqualify the Bidder. In the event of either withdrawal or disqualification under this Subparagraph, bid security will not be forfeited.

5. Persons and entities proposed by the Bidder and to whom the Owner and the Architect have made no reasonable objection must be used on the Work for which they were proposed and shall not be changed except with the written consent of the Owner and the Architect.

PERFORMANCE BOND AND LABOR AND MATERIAL PAYMENT BOND

l. Prior to execution of the Contract, if required hereinafter, the Bidder may be required to furnish bonds covering the faithful performance of the Contract and the payment of all obligations arising thereunder in such form and amount as the Owner may prescribe. Bonds may be secured through the Bidder's usual sources. If the furnishing of such bonds is stipulated, the cost shall be included in the Bid or as an Alternate in the area provided on the Proposal forms.

2. Any bid that is in excess of $50,000.00, if awarded, will be required to provide 100 percent (100%) of the contract amount coverage in Performance Bond and Payment Bond as required by Public Act 1963, No. 213

3. The Bidder shall deliver the required bonds to the Owner not later that the date of execution of the Contract, or if the Work is to be commenced prior thereto in response to a letter of intent, the Bidder shall, prior to commencement of the Work, submit evidence satisfactory to the Owner that such bonds will be furnished.

GRATIOT-ISABELLA RESD

NEW NATURE CENTER - FOREST HILLS NATURE CENTER

ROGER L DONALDSON, AIA P.L.C.

PROJECT #24-43 00 21 13- 4

4. Unless otherwise required, the bonds shall be written on AIA Documents A312-1984, Performance Bond and Labor and

Material Payment Bond.

5. The Bidder shall require the attorney-in-fact who executes the required bonds on be half of the surety to affix thereto a certified and current copy of his power of attorney.

FORM OF AGREEMENT BETWEEN OWNER AND CONTRACTOR

1. The Agreement for the Work will be a written on AIA Document A101-2017, Standard Form of Agreement between Owner and

Contractor.

END OF SECTION 00 21 13

ROGER L DONALDSON, AIA P.L.C.

PROJECT #24-43 00 21 14-1

SECTION 00 21 14

STATEMENT OF NO BID

Note: If you do not intend to bid, please return any bidding documents and this form to the Architect

We, the undersigned, are declining to bid on the above project for the following reason(s):

Insufficient time to respond to the Invitation to Bid.

Request for Proposal is unclear.

Do not offer this product or service.

Our schedule will not permit us to perform.

Unable to meet specifications.

Specifications are unclear (please explain below)

Remove us from your Bidder Mailing List.

Other (please explain below)

Remarks:

Signature:

Company Name:

Date: Telephone: Fax:

END OF SECTION 00 21 14

SECTION 00 21 14

STATEMENT OF NO BID

GRATIOT-ISABELLA RESD

NEW NATURE CENTER - FOREST HILLS NATURE CENTER

PROJECT #24-43 00 21 14-2

ROGER L DONALDSON, AIA P.L.C.

PROJECT #24-43 00 31 32-1

SECTION 00 31 32

GEOTECHNICAL DATA

1.1 GEOTECHNICAL DATA

A. This Document with its referenced attachments is part of the Procurement and Contracting Requirements for Project.

They provide Owner's information for Bidders' convenience and are intended to supplement rather than serve in lieu of Bidders' own investigations. They are made available for Bidders' convenience and information. This Document and its attachments are not part of the Contract Documents.

B. Because subsurface conditions indicated by the soil borings are a sampling in relation to the entire construction area, and for other reasons, the Owner, the Architect, the Architect's consultants, and the firm reporting the subsurface conditions do not warranty the conditions below the depths of the borings or that the strata logged from the borings are necessarily typical of the entire site. Any party using the information described in the soil borings and geotechnical report shall accept full responsibility for its use.

C. The following Fifty (50) pages are a copy of the Geotechnical Evaluation Report completed by SME, SME Project

Number: 099913.00, dated January 28, 2026, is available for viewing as appended to this Document.

1. The opinions expressed in this report are those of a geotechnical engineer and represent interpretations of subsoil conditions, tests, and results of analyses conducted by a geotechnical engineer. Owner is not responsible for interpretations or conclusions drawn from the data.

2. Any party using information described in the geotechnical report shall make additional test borings and conduct other exploratory operations that may be required to determine the character of subsurface materials that may be encountered.

SECTION 00 31 32

GEOTECHNICAL DATA

GRATIOT-ISABELLA RESD

NEW NATURE CENTER - FOREST HILLS NATURE CENTER

PROJECT #24-43 00 31 32-2

GEOTECHNICAL EVALUATION REPORT

FOREST HILL NATURE CENTER

SEVILLE TOWNSHIP, GRATIOT COUNTY, MICHIGAN

SME Project Number: 099913.00

January 28, 2026

Docusign Envelope ID: D0834A94-D30E-46D0-A547-49E6A155DADA

2663 Eaton Rapids Road Lansing, MI 48911-6310

T (517) 887-9181 www.sme-usa.com

© 2026 Soil and Materials Engineers, Inc.

SME and the SME logo are federally registered marks.

099913.00_JAN282026_GER

January 28, 2026

Mr. Roger Donaldson, AIA Roger L. Donaldson, AIA, PLC 4787 Tartan Lane Holt, Michigan 48842

Via E-Mail: Roger.Donaldson@comcast.net

RE: Geotechnical Evaluation Report

Forest Hill Nature Center 11297 North Rich Road Seville Township, Gratiot County, Michigan SME Project No. 099913.00

Dear Mr. Donaldson:

We have completed our geotechnical evaluation for the referenced project. This report presents the results of our subsurface exploration, laboratory testing, infiltration testing, our geotechnical recommendations, and a discussion of potential construction considerations based on the information disclosed by the subsurface investigation.

We appreciate this opportunity to be of service. If you have questions or require additional information, please contact me.

Sincerely, SME

Alexandra R. Costanzo, PE Project Manager

Enclosure: SME Geotechnical Evaluation Report; Dated January 28, 202

1. INTRODUCTION

1.1 SITE CONDITIONS

1.2 PROJECT DESCRIPTION

1.3 SUBSURFACE CONDITIONS

1.4 DYNAMIC CONE PENETROMETER TESTING

2. ANALYSIS AND RECOMMENDATIONS

2.1 SITE PREPARATION AND EARTHWORK

2.1.1 EXISTING FILL CONSIDERATIONS

2.1.2 GENERAL SITE SUBGRADE PREPARATION

2.1.3 SUBGRADE PREPARATION FOR FLOOR SLABS

2.1.4 ENGINEERED FILL REQUIREMENTS

2.2 FOUNDATIONS

2.2.1 SUBGRADE VERIFICATION

2.2.2 SHALLOW FOUNDATIONS

2.3 SEISMIC SITE CLASS

2.4 INFILTRATION CONSIDERATIONS

3. EXCAVATION AND GROUNDWATER MANAGEMENT

4. EVALUATION PROCEDURES

4.1 FIELD EXPLORATION

4.2 LABORATORY TESTING

5. SIGNATURES

APPENDIX A

BORING AND INFILTRATION TEST LOCATION DIAGRAM (FIGURE NO. 1)

BORING LOG TERMINOLOGY

BORING LOGS (B1 THROUGH B13)

DCP TEST RESULTS (B6 THROUGH B11)

APPENDIX B

FIELD TEST PROCEDURES

LABORATORY TESTING PROCEDURES

LIMITATIONS PERTAINING TO SUBSURFACE CONDITIONS

APPENDIX C

IMPORTANT INFORMATION ABOUT THIS GEOTECHNICAL-ENGINEERING REPORT

GENERAL COMMENTS

099913.00_JAN282026_GER 1

1. INTRODUCTION

This report presents the results of the geotechnical evaluation performed by SME for the proposed Forest Hill Nature Center in Seville Township, Gratiot County, Michigan. The evaluation was conducted in general accordance with the scope of services outlined in SME Proposal No. P01393.25, dated April 18, 2025, Change Order Request No. 1, dated October 10, 2025, and Change Order Request No. 2, dated November 20, 2025. Our services were authorized by Roger L. Donaldson, AIA, PLC.

SME was provided with the following information, which was used in the evaluation and preparation of this report.

A sheet plan titled “Proposed Concept Site Plan” prepared by Roger L. Donaldson, AIA, PLC with a latest revision date of February 27, 2025.

A preliminary topographic survey titled “Forest Hills Nature Center” which was prepared by Wolverine Engineers and Surveyors, Inc. and dated October 2, 2024.

SME completed 15 soil test borings (B1 through B15) at the project site on October 20 and October 21, 2025, and January 12, 2026. After performing these borings, SME conducted four in-situ infiltration testing within the proposed septic drain field area (borings B12 through B15). Refer to the boring logs included in Appendix A for the specific depth and stratigraphy of each boring. The approximate boring locations and infiltration test locations are depicted on the Boring and Infiltration Test Location Diagram in Appendix A (Figure No. 1). Soil descriptions and the field and laboratory test results are presented on the boring logs.

Evaluation, exploration, and laboratory testing procedures are presented in Section 4 of this report.

IMAGE NO. 1: Excerpt from Figure No. 1 in Appendix A – Boring location diagram

099913.00_JAN282026_GER 2

1.1 SITE CONDITIONS

The project site is located at 11297 North Rich Road in Seville Township, Gratiot County, Michigan.

Based on the referenced plans, the site currently includes an existing nature center building, ancillary buildings, associated gravel parking and drive areas, grassy open space, wooded areas, and nearby water features. The proposed building area is located within the developed portion of the property, east of the existing nature center. The existing ground surface elevations across the overall property generally range from about 809 to 820 feet, with elevations in the proposed building area ranging from about 817 to 820 feet.

1.2 PROJECT DESCRIPTION

We understand the project will include demolition of the existing natural center building and northern ancillary building, and the design and construction of a new one-story, slab-on-grade nature center building with a plan area of approximately 14,200 square feet. The building is expected to utilize a conventional structural framing system supported on shallow foundations bearing on suitably prepared soil subgrades.

Bus loop drives and parking areas are planned adjacent to the new building. A new on-site septic system with an associated drain field is also planned in a designated area of the property. Specific structural loading information was not provided; however, based on similar projects, we anticipate maximum column loads of less than about 100 kips and wall loads of about 2 kips per lineal foot. We understand that cuts and fills of 3 feet or less will generally be required to achieve the proposed grades.

The recommendations of this report are based on the information provided above and the results of the field and laboratory evaluation. Contact SME if the final design information is different than discussed herein.

1.3 SUBSURFACE CONDITIONS

Based on the boring logs, the generalized subsurface profile below the site surface can be summarized as follows:

Stratum 1: Topsoil / Surficial Materials – Topsoil was encountered in most borings, generally about 4 to 15 inches thick. In some locations, granular surface materials (sand and gravel) associated with existing drive or parking surfaces were observed in lieu of topsoil.

Stratum 2: Granular Soils – Below the topsoil or surface gravel, most borings encountered silty sand, sand with silt and/or gravel, generally in very loose to medium dense conditions. These soils typically extend to depths of about 2 to 8 feet below the existing ground surface, depending on location. A stratum of existing sand fill was encountered in borings B2, B10, and B12 beneath the surficial materials, extending to depths of about 2 to 5 feet beneath the existing ground surface. A stratum of sandy silt was encountered at borings B2 and B10 in a loose to medium dense condition.

Stratum 3: Cohesive Soils – Underlying the granular soils, the borings generally encountered lean clay and sandy lean clay with stiff to hard consistencies. These cohesive soils extended to the explored depths of B1 through B12.

Refusal was not widely encountered in the deeper borings; however, localized obstructions (e.g., cobbles) and drilling difficulties were reported at two locations. In particular, at Boring B5 the driller reported driving a possible rock and sampler refusal at a depth of about 9.8 feet, and at Boring B1 noted difficulty advancing the augers at a depth of about 14 feet.

099913.00_JAN282026_GER 3

Groundwater was observed in five of the borings (i.e., B4, B9, B11, B13 and B15) at depths ranging from approximately 3.5 to 8 feet below the ground surface, corresponding to approximate elevations 801 to

809.5 feet. In other borings, groundwater was not observed during or upon completion of drilling. It should be noted that the absence of observed groundwater in open borings does not preclude higher groundwater levels or perched water conditions during wetter seasons or after significant precipitation events.

In clays, a long time may be required for the groundwater level in the borehole to reach an equilibrium position. Therefore, the use of groundwater observation wells (piezometers) is necessary to accurately determine the hydrostatic groundwater level within the clay soils at this site.

Additional detail regarding subsurface conditions is provided on the individual boring logs included in Appendix A. Refer to the Limitations Pertaining to Subsurface Conditions in Appendix B for additional information about groundwater level measurements. If more information regarding groundwater levels at this site is required, then we recommend performing additional subsurface assessment(s).

1.4 DYNAMIC CONE PENETROMETER TESTING

SME performed a Dynamic Cone Penetrometer (DCP) test at borings B6 through B11 using a United States Army Corps of Engineers (USACE) DCP to evaluate the consistency of the subgrade soils to an approximate depth of 3 feet from the ground surface. The results from the DCP test are used to estimate the in-situ California Bearing Ratio (CBR) of the subgrade. CBR is an index commonly used in pavement design that gives an indication of subgrade support characteristics. The USACE has developed relationships to estimate the in-situ CBR value from the results of the DCP tests.

Overall, the DCP results indicate very poor to poor support in the upper soils, which is consistent with the boring logs documenting topsoil over loose to medium dense granular soils and/or silt, underlain by very stiff lean clay (CL) at several locations. At most test locations (e.g., B6, B7, B8, and B10), the DCP data show a general increase in penetration resistance with depth, with CBR values increasing from very poor/poor levels near the surface to higher values at depth, reflecting improved stiffness and bearing resistance in the underlying materials. In contrast, the DCP results at Borings B9 and B11 show a different trend than the other test locations. At these locations, resistance generally increases through the upper portion of the profile; however, CBR values decrease at greater penetration depths, indicating a transition into locally softer and/or looser material within the depth range tested.

In summary, the DCP results confirm that near-surface soils can provide limited subgrade support, and while several locations show improvement with depth, localized weaker zones are present (notably at B9 and B11) within the depth range evaluated. The complete DCP measurements and correlated CBR values are provided in Appendix A.

2. ANALYSIS AND RECOMMENDATIONS

2.1 SITE PREPARATION AND EARTHWORK

2.1.1 EXISTING FILL CONSIDERATIONS

The existing fill encountered at borings B2, B10, and B12 extended to approximate elevations 810 to 814 feet. The existing fill was likely associated with the previous development at the site. Based on the condition of the existing fill, some compaction effort was likely used when the fill was placed. However, we consider the existing fill to be undocumented, because we are not aware of records that document fill placement and compaction operations, and uncontrolled because very loose condition of portions of the existing fill.

099913.00_JAN282026_GER 4

Based on the information obtained regarding the fill, we recommend the existing fill be removed (undercut) from beneath the proposed building footings. We believe the existing fill can be considered for support of the building grade-slabs and pavements provided:

The subgrade is properly evaluated and prepared as described in Section 2;

Unsuitable fill, if encountered, is removed within proposed building footprint and pavement areas and replaced with engineered fill; and

The Owner accepts the associated increased risk associated with supporting the proposed building floor slab and pavements over the existing fill, which could include greater than typical total and/or differential settlement, resulting in differential movements. These risks can be reduced, but not eliminated, if SME evaluates the existing fill at the building addition subgrade.

Existing fill to remain in-place beneath the proposed building grade-slab and pavements should be of sufficient strength and free of deleterious materials, such as excessive debris and organics. Unsuitable existing fill that cannot be improved in-place should be removed (i.e., undercut) and replaced with engineered fill that is placed and compacted per the requirements outlined in Section 2.1.3 of this report.

The recommendations provided in the following report sections are based on the assumption that existing fill will be removed from beneath proposed building footings, and suitable existing fill will remain in-place and be used to support the proposed building grade-slab and pavements. If the Owner does not accept the stated risks, the existing fill should be undercut from beneath the entire proposed building and pavements footprints.

2.1.2 GENERAL SITE SUBGRADE PREPARATION

The site contains areas of grass vegetation and wooded areas. The site will require clearing with removal of topsoil to reach suitable underlying subgrade, generally with some deeper removal anticipated near the larger trees for root masses. Remove topsoil, surface vegetation, and soils containing more than four percent organics from the planned roads, driveways, building areas, and areas to receive engineered fill.

Extend the clearing and stripping a minimum of 5 feet beyond the limits of these areas. Once stripped, we expect suitable underlying subgrade will consist of natural sands and areas of existing sand fill.

Reroute existing utilities (if any) from within the proposed development outside of the building footprint area. Remove abandoned utilities and backfill the resulting excavations with granular engineered fill. If it is necessary for existing utilities to be abandoned in-place, the utilities must not conflict with the proposed construction, they must be fully grouted, and the suitability of the existing backfill must be verified for structural support. Do not abandon utilities in-place within the zone of influence of proposed foundations.

The contractor needs to remove ponded surface water and prevent run-off from reaching foundation excavations and areas of prepared subgrade. The contractor needs to also establish positive surface drainage at the onset of construction to mitigate the potential for subgrade disturbance. To reduce the potential of subgrade disturbance across the site, restrict construction traffic to dedicated areas of the site that can be controlled and stabilized as needed.

After stripping the existing topsoil, pavement, and other deleterious materials, and after cutting to design grades, the exposed subgrade needs to be uniformly compacted using large construction equipment.

Take care during compaction not to damage nearby existing structures and underground utilities. As predominantly granular subgrade soils are anticipated, we recommend using a smooth-drum vibratory roller for the compaction operations. We recommend at least several passes be made with the compaction equipment. However, where silts or clays are encountered at the exposed subgrade level, omit subgrade compaction and proofroll the exposed subgrade (described below). If indicated by proofrolling, moisture conditioning and/or undercutting will be necessary to allow for compaction of these soils. Silts and clays should be compacted with a sheepsfoot roller.

099913.00_JAN282026_GER 5

The overall success of the subgrade preparation during mass earthwork operations will directly affect the suitability of pavement/slab bearing soils. For areas of disturbed subgrade after compaction, it will be necessary to improve the disturbed soils or remove and replace them with engineered fill. Improvement of the exposed subgrade may consist of aerating and drying disturbed soils (during favorable weather conditions), recompacting these soils in-place, as well as placement of crushed aggregate or crushed concrete, possibly with a geotextile for separation. Another option could include mixing the upper subgrade with lime and/or cement-based additives if the subgrade experiences significant disturbance and cannot be improved by more conventional methods.

After compaction of the subgrade and prior to raising site grades, proofroll the exposed subgrade in the presence of SME. The purpose of the proofroll is to locate areas of unsuitably loose or disturbed subgrade. Mechanically improve areas of unsuitable subgrade revealed during proofrolling by compaction in-place, if feasible. Soils that cannot be improved in-place must be removed and replaced with engineered fill. Perform proofrolling with a fully-loaded, tandem-axle truck or other suitable-sized pneumatic-tire construction equipment.

After the exposed subgrade is proofrolled and improved as needed, and after the surface is thoroughly compacted, engineered fill may be placed on the prepared subgrade to establish final design subgrade levels. Refer to Section 2.1.3 of this report for materials and compaction requirements for engineered fill.

2.1.3 SUBGRADE PREPARATION FOR FLOOR SLABS

The final floor slab subgrade for the proposed buildings is anticipated to consist of natural sands or existing sand fill that has been evaluated and having passed…