Basic Practices Homeowners and Contractors should be able to develop a plan meeting the standards without much assistance. Design Plan will include sketch and narrative that will be documented on the Job Sheet. Intermediate Practices requires an experienced contractor and more assistance from the District to size and site the practice. The design plan includes a sketch by the participant and design details (i.e. typical details and cross sections) developed with District guidance. Advanced Practices are the Engineered Practices and requires an engineered design. For small scale implementation, the participant may sign a release form that forgoes the need for a design by a licensed professional. For moderate scale implementations, the steering committee will review the participants eligibility to forgo an engineer design. For large scale implementation, an engineer design is required.
Section 3.0 General Policies
Practice Eligibility ∗ Not for regulatory
compliance ∗ Not for Stormwater
offset or Nutrient Trading
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Presentation Notes
The proposed practice cannot be used to meet a requirement made by a regulatory agency. The proposed practice cannot be used to sell credits as part of a regulatory trading program.
Section 3.0 Life Span
All Practices have a 10-year Life
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Presentation Notes
The Life of the practice starts at practice completion. A final inspection by the District verifies the installation. Early corrective action is taken to ensure survivalibility of plants for the first year. Spot Checks are used during the life of the practice to verify performance. At the end of the life span, the practice is removed from the database, unless re-certification occurs (not a VCAP responsibility).
Design Plans and/or Job Sheet must be submitted with the following information: ∗ Sketch showing the Practice location; drainage area;
impervious area treated; and dimensions ∗ Cross Section showing depth; slope; and Practice
Components ∗ Materials List and Cost Estimate ∗ Installation sequence including stabilization plan ∗ Distance to waterway or storm drain ∗ Necessary computations per practice standard
Section 3.0 Plans and Specifications
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Presentation Notes
Participant is responsible for meeting all Local, State and Federal permits, policies and ordinances. Typical cross sections may be used as necessary.
Example Plan: Conservation Landscaping
(Meadow)
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Presentation Notes
No engineering is necessary for Conservation Landscaping. The Design Plan can consist of an aerial sketch and narrative or Contractor bid.
Example Plan: Rain Garden
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Presentation Notes
Some Engineering is necessary for Rain Gardens. The design plan does not need to be stamped by an engineer. Plans include a more detailed sketch, detailed cross section and material specifications.
Example Plan: Bioretention
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Presentation Notes
Engineered Practices, like Bioretention, need to be designed by a licensed professional.
∗ Participant accepts maintenance responsibilities ∗ Operation and Maintenance Plan must be developed
and put on the Job Sheet (VCAP Form-2) ∗ Job Sheet is attached to the Landowner Agreement
(VCAP Form-3) ∗ Each Practice has different Maintenance Guidelines
Section 3.0 Operation and Maintenance
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Presentation Notes
The operation and maintenance plan on the Job Sheet must meet the applicable standards and site conditions. The O&M plan should include Inspection Plan with List of structural components and normal operating conditions. The Landowner Agreement becomes the enforceable maintenance document that references the O&M plan on the Job Sheet.
∗ Participant submits project plans. Plans must meet all local codes, ordinances, policies and permits. Districts may provide technical guidance where applicable.
∗ Districts should have staff capable of reviewing and inspecting stormwater BMPs. E&S and Stormwater state certification preferred.
∗ Licensed professionals are responsible for certifying design plans for Engineered Practices. Participant may assume full responsibility and forgo a licensed professional design using the Release Agreement (VCAP Form-5)
Section 3.0 Technical Responsibility
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Presentation Notes
Participants submits a signed Contract (VCAP Form – 1) with a design plan. The level of the design plan depends on the practice. Districts reviews the design plan and inspects during and after construction. The District staff should maintain their technical capacity to read and understand all aspects of BMP design, construction and maintenance. VCAP trainings hope to bridge the gap in technical capacity. Districts holding DEQ certifications in E&S and Stormwater or equivalent Job Approval Authority will be more proficient review some practices than others. Licensed professionals are required to stamp design plans submitted for Engineered Practices. Request for waiving this requirement will be considered case-by-case.
∗ Cost Estimates are needed for Cost Share Allocations ∗ Pretreatment costs are included in the total cost of
the practice ∗ Engineering Costs should be no more than 25% of the
total cost of installation.
Section 3.0 Cost Share Incentive
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Presentation Notes
Most practices offer 75% cost share or a flat incentive payment. Costs should include the construction of all practice components, including pretreatment as required by practice standard. Engineering costs may also be included in the total costs (Typically 20-25% of total). Permit costs may be included, but performance bonds cannot be included. Homeowner in-kind costs must be no more than the national volunteer rate ($23.07)
∗ Miss Utility – utility conflicts ∗ Zoning investigations – setbacks; use restrictions ∗ HOA investigations – lot restrictions ∗ Soils investigations – practices that Infiltrate or
Soils – Infiltration and compaction tests are biggest limitation to practice installation Setbacks are the second biggest limitation, followed by local and HOA restrictions
New Retrofit Practices
Virginia Conservation Assistance Program Eligible Practices
Impervious Surface Removal (ISR)
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Converting impervious surfaces to vegetation or permeable surfaces Incentive Payment $2.50/ sq. ft up to $10,000.
Conservation Landscaping (CL)
Mulch Bed Meadow
Tree Planting
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Converting high input grasses to low input natives. Converting forested areas not eligible. Meadows; Mulched Beds and Tree Plantings Two configurations: Filter Strips and Riparian Buffer Incentive Payments: $250/1,000 sq. ft. or $9 per tree up to $3,500
Rain Garden (RG)
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Depressed Landscaping on native soils with compost amendments designed to temporarily pond runoff. Must capture runoff within 40 feet of the impervious surface. 75% Cost Share not to exceed $2,000.00
Dry Well (DW)
Gravel with Pretreatment Chamber System
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Excavated Pit or Trench filled with stone aggregate or bottomless chambers that is connected to the downspout or storm pipe with a 12 inch sod covering. There is a small scale surface trench option; gravel diaphragm for reducing impervious sheet flow. 75% Cost Share up to $2,000.00
Constructed Wetland (CW)
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Depressed landscaping with a permanent pool creating hydric soils. 75% Cost Share up to $5,000
Vegetated Stormwater Conveyance (VSC)
Dry Swale Wet Swale
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Dry Swales and Wet Swales require permanent check dams. Dry Swales temporary pond runoff, Wet Swales have permanent pool. CDA: 5 acres Dry Swales: Slope <4%Wet Swales: Slope <2%Step Pool Conveyance: Slopes <10% 75% Cost Share up to $3,000 or $5,000 depending on practice
Rainwater Harvesting (RH)
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Incentive Payment $2 per gallon up to $10,000. Total Cost can include pad, cistern and collection system.
Infiltration (IF)
Rock Trench Bottomless Chambers
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Surface trench or underground reservoir of stones or open bottom chambers. Drainage area = 2.5 acres 75% Cost Share up to $10,000
Bioretention (BR)
Raised Bed with soil media Drainage Area of ½ acre
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Presentation Notes
Depressed Landscaping requiring engineered soil media and under drain. Raised Planters would be Bioretention. Drainage area of 2.5 acre 75% Cost Share up to $10,000
Permeable Pavement (PP)
Porous Asphalt Interlocking Pavers
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Pervious: Filled with soil with minimum subbase reservoir; Grasspavers, geogrid pavers Porous: Contains pores with reservoir layer; Asphalt, Concrete Permeable: Porous joints with reservoir layer; Interlocking Pavers Incentive Payment of $3 per sq. ft. up to $10,000
Green Roof (GR)
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Presentation Notes
Vegetated Roof with a drainage layer and root barrier with growing media. Layers: Waterproofing; Root Barrier; Drainage; Nonwoven Geotextile Fabric; Soil Media; E&S coverings Incentive Payment of $10 per square foot up to $10,000
Virginia Stormwater BMP Clearinghouse Specifications: ∗ http://vwrrc.vt.edu/swc/NonProprietaryBMPs.html ∗ http://www.vwrrc.vt.edu/swc/ProprietaryBMPs.html
