12-02260 Finish Grading.pdf
PDF 102 KB Posted
- Attached to
- County Line Bridge Replacement Design Build
- Solicitation number
- Not on record
- Issued by
- Montgomery County, Pennsylvania
About this file
This is a technical specification document for finish grading work prepared by Douglass Township in Montgomery County, Pennsylvania, as part of the County Line Bridge Replacement Design Build project. The specification outlines the placement, compaction, and rolling of finish grade materials prior to landscaping, requiring completion within thirty days after work in unpaved areas unless the Engineer grants an extension. The work involves subsoil preparation including rough grading, debris removal, compaction to specified density requirements, and placement of topsoil to minimum depths of six inches for both seeded and sodded areas. Subsoil must be compacted to a minimum of ninety-five percent of maximum dry density for structural fill in eight-inch lifts, with moisture content maintained within plus or minus two percent of optimum levels, while non-structural fill in lawns and unpaved areas requires ninety-two percent compaction density. The specification requires protection of existing site features including fencing, trees, landscaping, utilities, and pavement, with all damage to be corrected at no cost to the owner.
Topsoil materials may be sourced from on-site stockpiles of the top six inches of ground surface as approved by the Engineer, or from approved off-site sources if on-site materials are insufficient. Off-site topsoil must meet specific compositional requirements including forty-five to fifty percent sand, fifteen to twenty percent clay, minimum 2.5 percent organic matter, and a pH range of 6.0 to 6.5, with laboratory testing required and results submitted for Engineer approval. Topsoil placement must occur during dry weather in a relatively dry state, with manual spreading required around trees and plants to prevent equipment damage, followed by light compaction or rolling. All surplus materials and stockpile areas must be left clean and raked upon completion. The specification references related work in rough grading (Section 02210) and lawns and grasses (Section 02930), establishing this as part of a comprehensive site preparation and landscaping package for the broader bridge replacement and administration building renovation project.
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Text version
02260-1
SECTION 02260
FINISH GRADING
PART 1GENERAL
1.1 DESCRIPTION OF WORK
A. This Section describes placing, compacting and rolling finish grade materials prior to landscaping work.
B. Finished grading is to be completed within thirty (30) days after completion of the work in unpaved areas unless an extension is granted by the Engineer.
1.2 RELATED WORK SPECIFIED ELSEWHERE
A. Rough Grading - Section 02210.
B. Lawns and Grasses - Section 02930.
1.3 PROTECTION
A. Prevent damage to existing fencing, trees, landscaping, natural features, bench marks, pavement, utility lines and other existing site features. Correct damage at no cost to the Owner.
PART 2PRODUCTS
2.1 MATERIALS
A. Onsite Topsoil: Onsite soil material from the top six (6”) inches of ground surface, as available in stockpiles, and as approved by Engineer.
B. Offsite Topsoil: If on-site topsoil is insufficient in quantity to provide specified thickness, provide topsoil from approved off-site sources as required to complete the work. Off-site topsoil shall meet the following minimum requirements.
1. Topsoil shall be fertile, friable, well drained, pH range of 6.0 to 6.5, free of sub-soil, toxic substances harmful to plant growth without clay lumps, stones, roots or debris.
Analysis of content shall be as follows:
Sand - 35% to 40%
02260-2
Clay - 15% to 20% Organic Matter - 2.5% Silt - Balance
2. Test off-site topsoil by a soils testing laboratory retained and compensated by the Contractor and approved by the engineer and submit copy of test report for approval by the engineer.
PART 3EXECUTION
3.1 SUBSOIL PREPARATION
A. Rough grade subsoil systematically to allow for a maximum amount of natural settlement and compaction. Eliminate uneven areas and low spots. Remove debris, roots, branches, stones, etc. in excess of two (2”) inches in size. Remove subsoil which has been contaminated with petroleum products, or other toxic substances.
B. Cut out areas, to sub-grade elevation, which are to receive stabilizing base for paving, sidewalks, and planting beds.
C. Bring subsoil to required levels, profiles and contours. Make changes in grade gradually. Blend slopes into level areas.
D. Slope grade away from building minimum two (2%) percent, unless indicated otherwise on drawings.
E. Cultivate subgrade to a depth of six (6”) inches where topsoil is to be placed. Repeat cultivation in areas where equipment, used for hauling and spreading topsoil, has compacted subsoil.
F. Compact subsoil as specified.
1. General: Control soil compaction during construction providing minimum percentage of density specified for each area classification.
2. Control soil compaction during construction for compliance with the percentage of maximum dry density specified in accordance with ASTM D 1557.
3. Place fill in approximately horizontal lifts with a loose thickness of not more than eight (8”) inches for material compacted by heavy compaction equipment four (4”) inches for material compacted by hand operated tampers.
4. Percentage of Maximum Density Requirements: All fill and backfill, shall be compacted in maximum eight (8”) inch thick lifts to a minimum of ninety-fiv
02260-3 e (95%) percent of maximum dry density. During placement and compaction, the moisture content of fill, backfill and structural backfill material shall be not more than two (2%) percent above or below the optimum moisture content. Non-structural compacted fill (lawns and unpaved areas) shall be compacted to a minimum of ninety-two (95%) percent of maximum dry density.
5. The moisture content of the fill materials shall be adjusted, if necessary, by aeration or sprinkling, so as to be within plus or minus two (2%) percentage points of the optimum moisture content determined in the laboratory.
6. Remove and replace, or scarify and air dry, soil material that is too wet to permit compaction to specified density.
3.2 PLACING TOPSOIL
A. Place topsoil in areas where seeding and sodding is to be performed. Place to the following minimum depths, up to finished grade elevations.
1. Six (6”) inches for seeded areas.
2. Six (6”) inches for sodded areas.
B. Use topsoil in relatively dry state. Place during dry weather.
C. Fine grade topsoil eliminating rough and low areas to ensure positive drainage. Maintain levels, profiles and contours of finish grades. Unless indicated otherwise on the drawings, the finish grades shall conform to the grades that exist prior to construction.
D. Remove stone larger than one (1”) inch, roots, grass, weeds, debris, and other foreign material while spreading.
E. Manually spread topsoil around trees, plants, and building to prevent damage which may be caused by grading equipment.
F. Lightly compact or roll placed topsoil.
3.3 SURPLUS MATERIAL
A. Leave stockpile areas and entire job site clean and raked.
END OF SECTION
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