32 91 19 - Landscape Grading.pdf
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- Attached to
- West Pump Station Replacement Project
- Solicitation number
- Not on record
- Issued by
- Chester County, Pennsylvania
About this file
This is a technical specification document for landscape grading work prepared by Herbert, Rowland & Grubic, Inc., associated with the West Pump Station Replacement Project being administered by the Northwestern Chester County Municipal Authority in Pennsylvania. The specification covers final grade topsoil preparation for finish landscaping as part of the broader pump station construction project. The work includes placing topsoil to a minimum nominal depth of 4 inches in areas where seeding is required, fine grading to eliminate rough or low areas, removing debris and foreign materials, and lightly compacting placed topsoil. Substrate preparation requires scarification to a depth of 3 inches where topsoil is scheduled, elimination of uneven areas and low spots, and removal of debris, roots, branches, and stones exceeding 1/2 inch in size. The specification establishes a tolerance of plus or minus 1/2 inch for the top of topsoil and prohibits construction traffic over completed topsoil work.
The specification requires that topsoil materials be sourced from a single supplier throughout the work and that manufacturers provide certificates verifying products meet or exceed specified requirements. Materials must comply with standards outlined in Section 31 05 13 - Soils for Earthwork. All topsoil placement must occur during dry weather, with manual spreading required in areas near buildings, utilities, and pavement to prevent damage. The document cross-references related specifications for trenching backfilling, building area backfilling, and seeding, indicating this landscape grading work is one component of the larger pump station replacement project. Bidding for the overall project was scheduled to close on May 20, 2026, with three separate contracts available: WPS-1 for General Construction, WPS-2 for Electrical Construction, and WPS-3 for Mechanical Construction, all on a lump sum basis.
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Text version
32 91 19 – LANDSCAPE GRADING
Herbert, Rowland & Grubic, Inc. 32 91 19 - 1 000483.0450
SECTION 32 91 19 – LANDSCAPE GRADING
PART 1 - GENERAL
1.1 SUMMARY
A. Section Includes:
1. Final grade topsoil for finish landscaping.
B. Related Sections:
1. Section 31 05 13 – Soils for Earthwork.
2. Section 31 22 13 – Rough Grading: Site contouring.
3. Section 31 23 16.13 – Trenching: Backfilling trenches.
4. Section 31 23 23 – Fill: Backfilling at building areas.
5. Section 32 92 19 – Seeding.
1.2 SUBMITTALS
A. Section 01 33 00 – Submittal Procedures: Submittal procedures
B. Materials Source: Submit name of imported materials source.
C. Manufacturer's Certificate: Certify Products meet or exceed specified requirements.
1.3 QUALITY ASSURANCE
A. Furnish each topsoil material from single source throughout the Work.
PART 2 - PRODUCTS
2.1 MATERIAL
A. Topsoil: As specified in Section 31 05 13.
PART 3 - EXECUTION
3.1 EXAMINATION
A. Section 01 31 13 – Execution Requirements: Verification of existing conditions before starting work.
B. Verify building and trench backfilling have been inspected.
C. Verify substrate base has been contoured and compacted.
3.2 PREPARATION
A. Protect landscaping and other features remaining as final Work.
32 91 19 – LANDSCAPE GRADING
Herbert, Rowland & Grubic, Inc. 32 91 19 - 2 000483.0450
B. Protect existing structures, fences, utilities, and paving.
3.3 SUBSTRATE PREPARATION
A. Eliminate uneven areas and low spots.
B. Remove debris, roots, branches, stones, in excess of 1/2 inch in size. Remove contaminated subsoil.
C. Scarify surface to depth of 3 inches where topsoil is scheduled. Scarify in areas where equipment used for hauling and spreading topsoil has compacted subsoil.
3.4 PLACING TOPSOIL
A. Place topsoil in areas where seeding is required to a minimum nominal depth of 4 inches.
Place topsoil during dry weather.
B. Fine grade topsoil to eliminate rough or low areas. Maintain profiles and contour of subgrade.
C. Remove roots, weeds, rocks, and foreign material while spreading.
D. Manually spread topsoil close to building, utilities, and pavement to prevent damage.
E. Lightly compact placed topsoil.
F. Remove surplus subsoil from site.
3.5 TOLERANCES
A. Section 01 40 00 – Quality Requirements: Tolerances.
B. Top of Topsoil: Plus or minus 1/2 inch.
3.6 PROTECTION OF INSTALLED WORK
A. Section 01 73 00 – Execution Requirements: Requirements for protecting finished Work.
B. Prohibit construction traffic over topsoil.
END OF SECTION 32 91 19
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