HomeMy WebLinkAboutWorksheet D_Post Construction Soil ManagementRevised 1/2020 1
Before After
Post-Construction Soil Management Worksheet DBenefits of Healthy Soils
Step 1 – Retain and protect native vegetation and soil
Identify areas of the site that will not be disturbed during construction (cleared, graded, or
driven on). Fence those areas to prevent impacts during construction. If neither soils nor
vegetation are disturbed, these areas do not require amendment.
Step 2 – Loosen compacted subsoil, if needed
In disturbed areas (compacted by construction traffic):
• Scarify the top 4 inches of subsoil
• Rip in the first lift of topsoil
• Rip site soils 12 inches deep before tilling compost in to an 8-inch depth
Step 3 – Restore soils that are disturbed during construction
Three options to restore disturbed soils include:
5 Step Implementation Process
•Reduced need for irrigation,
fertilizers, and pesticides
• Decreased stormwater runoff
•Decreased erosion
• Improved plant health
• Marketable buildings and
landscapes
•Option 1: Till compost (1.75 inches for turf areas; 3 inches for planting beds)
into existing soil, or
•Option 2: Stockpile and reuse existing topsoil (amend if needed to meet 5%
organic matter content for turf areas; 10% organic matter content for planting
beds), onsite soil test (bulk density & organic matter) requied for this option, or
•Option 3: Import 8 inches of topsoil (with 5 to 10% organic content, soil
portion must be sandy) and scarify or till into existing soil in two 3-inch lifts
HTE #___________
Permit #_________
2
Compost options require tilling to a depth of 8”
After soil amendment
Post-Construction Soil Management Worksheet DExemptions
The following portions of the project area are
exempt from soil amendment requirements:
•Areas covered by an impervious surface, or
•Areas incorporated into a drainage facility, or
•Structural fill or engineered slopes
•On till slopes greater than 33%
1”-2” of mulch
3” of compost tilled in to
an 8” depth or 8” of
compost-amended topsoil
Planting bed
Native, undisturbed
soil
Stockpile and reuse existing
topsoil if it meets the organic
matter content requirementsTurf
1.75” of compost tilled in
to an 8” depth, or 8” of
compost-amended topsoil
Step 4 – Add mulch to planting beds
Spread mulch (coarse bark or wood chips) in the spring
or fall (after planting) to control weeds, reduce the
need for irrigation, and prevent erosion. Apply 2 inches
of mulch on planting beds and around shallow-rooted
annuals. Apply 2 to 4 inches of mulch around trees and
woody perennials, but make sure to keep mulch 1 inch
away from tree trunks.
5 Step Implementation Process (cont.)
Step 5 – Protect restored soils from erosion and re-compaction
Prevent runoff from roads or open slopes onto amended soil areas. Compost blankets are an
approved erosion control BMP that can be used during construction and then tilled into the
existing soil at the end of the construction process prior to planting. Once soils have been
amended, vehicle traffic should be prohibited to prevent re-compaction from occurring. In turf
areas seed or lay sod to stabilize soils.
Product Total Quantity (CY)Test Results
Product #1: Garden Glory Compost (Port
Angeles Landfill Facility [PALF])
CY
% organic matter
C:N ratio
“Stable”? yes no
Product #2: CY
% organic matter
C:N ratio
“Stable”? yes no
Product #3: CY
% organic matter
C:N ratio
“Stable”? yes no
Owner / Project Name:
Contractor Name:
Property Tax Account Number(s):
Site Address:
Total Amendment / Topsoil / Mulch for All Areas
(Calculate the quantities needed for the entire site based on all of the areas identified on the Site Plan and the calculations
on the following page(s)
(Check off required items that are attached)
3
Page # ____ of ____ pages
Calculate the quantities needed for the entire site based on all of the areas identified on the Site Plan and the calculations
on the following page(s)
Site Plan showing, to scale:
Areas of undisturbed native vegetation (no amendment required)
New planting beds (amendment required)
New turf areas (amendment required)
Other disturbed areas (amendment required)
Type of soil improvement proposed for each area
Soil test results (required if reusing existing top soil or proposing custom amendment rates)
Product test results for proposed amendments
Post-Construction Soil Management Worksheet DProject Information
Worksheet
Attachments Required
For each identified area on your site plan, provide the following information
Planting type:Turf Undisturbed native vegetation
Planting Beds Other:
4
Amend with
compost from
state approved
facility
Turf:SF x 5.4 CY ÷ 1,000 SF =CY
Planting beds: SF x 9.3 CY ÷ 1,000 SF= CY
Total Quantity = CY
Till depth: 8 inches
Product:
Garden Glory Compost (PALF)
Other:
Stockpile and
amend with
compost from
state approved
facility
Topsoil import
Turf:SF x 5.4 CY ÷ 1,000 SF =CY
Planting beds: SF x 9.3 CY ÷ 1,000 SF=CY
Total Quantity = CY
Scarification depth: 4 inches
Product:
Garden Glory Compost (PALF)
Other:
Turf:SF x 24.7 CY÷1,000 SF =CY
Planting beds: SF x 24.7 CY ÷ 1,000 SF= CY
Total Quantity = CY
Scarification depth: 4 inches
Product:
Other:
Amend with
compost
Attach information on bulk density, percent organic matter,
moisture content, C:N ratio, and heavy metals analysis to
support custom amendment rate and scarification depth.
Total Quantity = CY
Scarification depth: inches
Product:
Garden Glory Compost (PALF)
Other:
Stockpile and
amend
Attach information on bulk density, percent organic matter,
moisture content, C:N ratio, and heavy metals analysis to
support custom amendment rate and scarification depth.
Total Quantity = CY
Scarification depth: inches
Product:
Garden Glory Compost (PALF)
Other:
Planting beds: SF x 6.2 CY ÷ 1,000 SF= CY
Total Quantity = CY Product:
Area # (should match identified Area # on Site Plan)
(Use additional sheets if necessary):
MulchOption 3 Option 2 Option 1Post-Construction Soil Management Worksheet DPre-Approved Amendment Method
Custom Amendment (Use Building Soil Manual)
Mulch