31_22_19_-_FINISH_GRADING.pdf

Okaloosa County June 2026 “ITB TDD 65-26” Issue for Bid

FINISH GRADING

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SECTION 31 22 19

FINISH GRADING

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Topsoil quality and placing.

2. Finish grading.

B. Related Requirements: Include, but are not necessarily limited to, the following:

1. Section 31 10 00 - Site Clearing.

2. Section 31 23 05 - Excavation and Fill.

3. Section 31 23 33 - Trenching and Backfilling.

1.2 PRICE AND PAYMENT PROCEDURES

A. Measurement and Payment:

1. Perform the Work of this Section for all areas within limits of grading and all areas outside limits of grading disturbed during construction.

2. Perform the Work of this Section as part of the Lump Sum bid/pay item(s) indicated in the Contract.

1.3 REFERENCES

A. Reference Standards:

1. American Association of State Highway and Transportation Officials (AASHTO):

a. T194, Standard Method of Test for Determination of Organic Content of Soils by Loss on Ignition.

2. ASTM International (ASTM):

a. D2974, Standard Test Methods for Moisture, Ash, and Organic Matter of Peat and Other Organic Soils.

b. D4221, Standard Test Method for Dispersive Characteristics of Clay Soil by Double Hydrometer.

c. D4972, Standard Test Methods for pH of Soils.

d. D5268, Standard Specification for Topsoil Used for Landscaping and Construction

Purposes.

e. D6913, Standard Test Methods for Particle-Size Distribution (Gradation) of Soils Using

Sieve Analysis.

f. D7928, Standard Test Method for Particle-Size Distribution (Gradation) of Fine-Grained

Soils Using the Sedimentation (Hydrometer) Analysis.

g. E329, Standard Specification for Agencies Engaged in Construction Inspection, Testing, or Special Inspection.

1.4 QUALITY ASSURANCE

A. Qualifications:

1. Contractor’s Testing Laboratory:

a. Retain the services of independent testing laboratory to perform testing and determine compliance with the Contract Documents of materials specified in this Section.

b. When Contractor is expressly required, by this Section’s “Quality Assurance” Article, “Source Quality Control” Article or elsewhere in the Contract Documents, to retain testing laboratory for tests required under this Section’s “Quality Assurance” Article or

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“Source Quality Control” Article, retain one testing laboratory for quality assurance testing and field quality control testing.

c. Testing laboratory shall comply with ASTM E329.

d. Testing laboratory shall be experienced in the types of testing required.

e. Selection of testing laboratory is subject to Engineer’s acceptance. Upon Engineer’s request, submit qualifications statement for testing laboratory, including name of entity, location, copies of applicable certifications, summary of entity’s experience, and names and qualifications of personnel who will perform the subject sampling and testing.

B. Quality Assurance Testing:

1. Quality assurance testing, which may also be regarded as source quality control testing when topsoil to be installed will be topsoil originally stripped from the Site, is in addition to field quality control activities required by this Section’s “Field Quality Control” Article.

2. Allow free access to material stockpiles and borrow areas at all times. Tests shall be at Contractor’s cost.

3. Contractor’s Testing Laboratory Scope:

a. Obtain samples and perform testing of proposed topsoil materials, whether obtained from offsite borrow sources or stockpiled topsoil originally stripped from the Site, to provide assurance that the Work will comply with the Contract Documents.

4. Required Quality Assurance Material Testing by Contractor’s Testing Laboratory:

a. Perform the following quality assurance tests for every 1,000 cubic yards of topsoil, or part thereof, to be incorporated into the Work. Submit results of such tests to Engineer and obtain Engineer’s acceptance thereof prior to incorporating the subject topsoil into the Work.

1) Gradation in accordance with ASTM D6913 and D7928.

2) Clay content in accordance with ASTM D4221.

3) pH in accordance with ASTM D4972.

4) Organic content in accordance with ASTM D2974 or AASHTO T194.

1.5 SUBMITTALS

A. Action Submittals: Submit the following:

1. Product Data:

a. Borrow Soil Materials: Name and address of Supplier of borrow soil materials, gradation, and Supplier’s certification that materials are sufficiently free of Constituents of Concern so that a Hazardous Environmental Condition will not be created or exacerbated.

b. If no soil materials will be obtained from any borrow location, expressly so indicate to Engineer in writing.

2. Samples:

a. Submit Sample of topsoil material required by this Section. Furnish Samples in durable, tightly-sealed containers; plastic bags are unacceptable. Samples shall be of sufficient quantity and material size to demonstrate the array of gradation and material types expected in the Work.

B. Informational Submittals: Submit the following:

1. Quality Assurance Test Results Submittals:

a. Submit results of quality assurance testing performed in accordance with this Section’s

“Quality Assurance” Article, unless included as part of another submittal under this Section.

1) Tests on materials from onsite and borrow sources.

2. Qualifications Statements:

a. Quality assurance testing laboratory, when requested by Engineer.

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PART 2 - PRODUCTS

2.1 MATERIALS

A. Topsoil:

1. All soil accepted as topsoil, whether obtained from onsite or offsite sources, shall comply with requirements of this Section.

2. Topsoil Source: Reuse surface soil stockpiled on Site, where possible. Verify suitability of stockpiled surface soil to produce topsoil, as specified. Clean surface soil of roots, plants, sod, stones, clay lumps, and other extraneous materials harmful to plant growth.

a. Supplement acceptable onsite soil with manufactured topsoil from offsite sources, when quantities available on-Site are insufficient to complete the Work.

b. When existing soil material stripped from the Site and stockpiled does not comply with requirements of this Section, such soil may be provided as topsoil when addition of amendments and fertilizers will bring such soil material into compliance with this Section’s topsoil requirements. Furnish to Engineer written advisory of Contractor’s intent to amend existing soil materials to be compliant with topsoil requirements.

3. Provide fertile, friable, natural loam, surface soil, capable of sustaining vigorous plant growth; free of any admixture of subsoil, clods of hard earth, plants or roots, sticks, stones larger than 3/8 inch diameter, or other extraneous material harmful to plant growth, in compliance with ASTM D 5268.

4. Provide topsoil of the following characteristics:

a. Required gradation:

Sieve Size Percent Passing

3/4 inch mesh 100

No. 4-sieve 90 to 100

No. 200-sieve 0 to 10

b. Clay content of material passing No. 200-sieve shall be not greater than 60 percent, as determined by hydrometer tests.

c. pH-adjusted with ferrous sulphate or ground limestone to provide pH 5.5 to 7.0 at time of installation of lawns and meadow areas, unless particular species of planting requires a different pH for optimal growth.

d. Electrical conductivity of a 1:2 soil-water suspension shall not exceed 1.0 milliohm per centimeter and with less than 200 parts per million of extractable aluminum.

e. Cation Exchange Capacity: 5, minimum.

f. Organic content not less than five percent, as determined by ignition loss of oven-dried samples passing No. 10-sieve (Muffle Furnace Temperature: 110 plus or minus five degrees C for eight hours).

g. Free of pests and pest larvae.

h. Relative to Constituents of Concern, topsoil shall be in accordance with Laws and

Regulations. Constituents of Concern, if any, in topsoil furnished shall not constitute or result in a Hazardous Environmental Condition.

B. Topsoil Amendments and Fertilizer

1. Requirements for topsoil amendments and fertilizer, together with other planting materials, are in Section 32 92 00 - Seeding, Sodding, and Landscaping.

2. Provide planting soil by adding amendments, fertilizer, and other materials to topsoil and other suitable soil materials in accordance with Section 32 92 00 - Seeding, Sodding, and Landscaping, as necessary to support vigorous growth of required plantings.

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2.2 SOURCE QUALITY CONTROL

A. Tests and Inspections at Source of Supply:

1. Perform quality assurance testing, and submit results to Engineer, in accordance with the “Quality Assurance” Article in Part 1 of this Section.

PART 3 - EXECUTION

3.1 PREPARATION

A. Protection of In-place Conditions:

1. Protect structures, utilities, sidewalks, pavements, and other facilities, and lawns and existing plants from damage caused by finish grading.

B. Preparation – General:

1. In accordance with Section 01 57 05 - Temporary Controls, provide temporary measures for controlling erosion and sedimentation, airborne dust, and fugitive dust emissions from the Site.

2. Topsoil stripping and stockpiling requirements are indicated in Section 31 10 00 - Site Clearing.

3. Adjust rough grading to within 0.1 foot of required elevations. Properly compact sub-grades. Rough grading shall provide for appropriate drainage in accordance with the Contract Documents.

4. Before applying topsoil:

a. Remove from exposed subgrade all stones and debris over one inches in any dimension and properly dispose of such items at an appropriate, offsite location.

b. Apply superphosphate fertilizer directly to subgrade before loosening.

c. Loosen sub-grade surface to depth of not less than two inches.

3.2 INSTALLATION

A. Installation Requirements:

1. Required Depth of Topsoil:

a. For areas of gardens, shrubs and similar plantings, provide finished, lightly compacted, topsoil depth of not less than 6 inches.

b. For all other areas requiring topsoil, including lawns and meadows, provide finished, lightly compacted, topsoil depth of not less than 4 inches.

2. Do not place topsoil when subgrade is muddy, wet or frozen enough to cause clodding.

3. Provide finished surface smooth and true to required grades, in accordance with this

Article’s “Installation Tolerances” provision. Provide finished surface of topsoil equal to required finished elevations after light rolling and natural settlement.

4. Grade topsoil to a smooth, uniform surface plane with loose, uniformly fine texture. Roll and rake, remove ridges, and fill depressions to provide required finish grades.

5. Restore topsoil if eroded or otherwise disturbed after finish grading and before planting.

6. Topsoil Quantity Differentials:

a. If quantity of required topsoil exceeds the quantity, if any, of topsoil stockpiled at the Site and available for use by Contractor, provide the additional required quantity from appropriate offsite borrow sources at no additional cost to Owner.

b. When quantity of topsoil obtained from offsite borrow sources exceeds the required quantity of topsoil, remove excess from the Site, unless Owner allows such excess to be stockpiled at an appropriate location at the Site.

c. When quantity of required topsoil is less than quantity of onsite stockpiles, following installation of topsoil, properly grade remaining stockpile for appropriate drainage

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31 22 19 - 5 without undue erosion and seed stockpile as required for other areas of lawn restoration in accordance with the Contract Documents.

B. Installation Tolerances:

1. Finish Grading Tolerance: ±0.1 foot from finish elevation required by the Contract Documents. Ensure adequate drainage.

3.3 FIELD QUALITY CONTROL

A. Tests and Inspections:

1. Upon completion of topsoil installation, obtain Engineer's concurrence regarding grades and drainage.

2. Where directed by Engineer, provide test holes to demonstrate that required depth of topsoil was provided. After observation and measurement by Engineer, properly refill test holes.

3. Where insufficient depth of topsoil is revealed, remedy by providing required depth and quantity in accordance with the Contract Documents. When additional topsoil is added after initial establishment of plant growth, re-establish required plantings to provide compliance with the Contract Documents.

3.4 PROTECTION

A. Commencing immediately after topsoil installation, protect installed topsoil from erosion and damage from other causes, including personnel, vehicles, and equipment. Promptly perform seeding, sodding (as applicable), mulching, and other measures to permanently stabilize soils and prevent erosion.

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