Compost Adventures – Organic Materials Utilization for Construction Activities that Protect US Waters (TPD0709028)

Outline

• History, MnDOT Utilization
• Specifications/Project & CADD Details, State Statutes

–      MNDOT 3890

–      State Statute 7035

• Projects
• Future Needs

MnDOT History

• Standard Specifications for Construction

–      1988: 1st occurrence in Spec book

• 1991: Supplement January 2
• 1994: Supplement May 2

– 1995:

–      1996: Assigned to solve compost problems

– 2000:

–      2005: Current

1988

• 3890 Established two Grade Types

–      Grade 1: use in turf establishment, nutrient rich type derived from the decomposition of poultry or animal manures with a texture similar to a highly organic soil.

• Min/Max of: Moisture content, CN ratio, TN, Available P, Soluble K

–      Grade 2: use in landscape planting medium, humus rich type derived from the decomposition of leaves and yard wastes or animal and poultry manure with a texture similar to shredded peat

• Max of moisture content, CN ratio, pH

–      Testing by U of M for P, K, Kjeldahl N, ASTM D2016 oven drying method

1991 supplement

• Required aerobic decomposition, with lack of odor or heat generation, no pathogenic bacteria or weed seeds and free of plastic debris, stones, sand, glass, and other extraneous matter.
• Will not accept sewage sludge
  • Must be registered for sale with the Dept of Agriculture and meet MPCA requirements for contaminates.
  • Defined ammonium N and soluble salts in Grade 2 compost
  • Allowed the right to bioassay test material
  • Required the contractor to submit source of material 30 days prior to delivery
  • Required certificate of compliance as per 1603

1994 supplement

• Required compost to be delivered in an air-dried condition
• Allowed commercial fortification of Grade 1 to meet nutrient specifications
• No longer allowed manure or animal wastes in Grade 2
• Certified test results to both Project Engineer and Agricultural Engineer (Office of Environmental Services)

1995

• Moisture content by mass
• pp. 989-991

2000

• Aerobic decomposition of organic wastes
• Define end point composting process

–          Loss on ignition

–          Solvita test

–          No smell, reheating, identifiable materials

–          PFRP

–          Process verify fecal coliform, salmonella spp.

• Allow up to 3% ‘foreign’ particles
• Biosolids acceptable under certain conditions
  • Identifies State Statutes 7035/7045 and Federal Regulations Title 40, section 503 requirements (metals, Hg, hazardous wastes), soils reference values (hazard index, quotients, cancer risk levels)
  • No pesticides levels that affect plants and animals existing in soils
    • At time of delivery, must be in a condition safe for human exposure to dusts during handling
    • Material requirements: OM, CN ratios, NPK ratios, pH, moisture, BD, inerts, soluble salts, germination tests, screened particle size, contaminates
    • Added Grade 3
    • Established an approved Vendor List
    • Equivalent testing procedures of the U of M

• 2571 Plant Installation
• 2573 Storm Water Management
• 3890 Compost Material
• 3897 Filter Log, Type Compost

–         Filter Log, Type Wood Chip

–         Filter Log, Type Metal Trap

• Special Provisions

–        Designer Soils

• Raingardens (10-20%)
• Wetlands (100%)
• Planting cells (33%)
• Rooting soils (50%)
• RSS wall fills (variable)

–        Erosion control

• Blankets
• Grouts

–        Storm Water Quality

• Diversion Berms,
• Filter logs
• Retrofitting

Log/bag Walls

(2105) TOPSOIL BORROW – MODIFIED

• A blend of three products

S-26           This work consists of placing and cultivating topsoil in accordance the appropriate Mn/DOT Standard Specifications, the Plans, and the following:

S-26.1         Topsoil Borrow-Modified (LV) shall consist of a mixture of 1/3 Premium Topsoil Borrow adhering to the requirements Mn/DOT 3877.2C and 1/3 Grade 2 Compost adhering to the requirements of Mn/DOT 3890 and 1/3 Sand adhering to the requirements of Mn/DOT 3149.2(k), blended on a volume basis. The mixture must be blended before being spread on the worksite. A sample shall be submitted to the Engineer for approval before the material is brought to the worksite.

S-26.2        Unload and store all materials in a manner so as to protect until placed.

S-26.3         Place six inches (6”) of soil and deep cultivate into the existing subgrade to a minimum of 300 mm (12 inches).    Operations shall not result in soil compaction due to excessively wet soil conditions (field capacity or wetter) or improper methods. To minimize soil compaction, the Contractor shall use a spading machine to loosen and till the soil.

S-26.4        METHOD OF MEASUREMENT AND BASIS OF PAYMENT

The select topsoil borrow modified will be measured by the Cubic Yard (LV) of soil furnished and installed as specified, and measured by loose volume. Payment will be made under Item 2105.607 (Topsoil Borrow Modified (LV)) at the Contract Bid Price per cubic yard (LV), which will be compensation in full for delivering, placing, and all costs involved.

3897Filter Logs

3897.1   SCOPE

This specification covers filter logs used for slowing and filtering storm water runoff, and other water encountered on the Project.

3897.2   REQUIREMENTS

Filter logs shall conform to the requirements of the following types, as specified in the Contract.

C           Type Compost Log

Compost Log shall consist of a blend of 30-40% weed free compost as per 3890 Grade 2 and 60-70% partially decomposed wood chips. The compost/wood blend material shall pass a 51 mm (2 inches) sieve with a minimum of 70% retained on the 10 mm (3/8 inch) sieve, in accordance with TMECC 02.02-B, “Sample Sieving for Aggregate Size Classification”. The compost/wood chip blend shall be pneumatically shot into a geotextile cylindrical bag. The geotextile bag shall consist of a knitted material with openings of 10 mm (3/8 inches) and contain the compost/wood chip material while not limiting water infiltration. The encased compost shall form a cylindrical log that is a maximum of 55 m (180 feet) and approximately 200 mm (8 inches) in diameter.

2573.540 Filter Log, Type (1)                                      meter (linear foot)

S-xxx   (2575) Compost Grouting

This work shall consist of furnishing and injecting a water permeable compost erosion control system into riprap to remove soil particles from water moving off site into adjacent waterways or storm water drainage systems and to facilitate the establishment of vegetative cover in accordance with the applicable Mn/DOT Standard Specifications and the following:

—————————————————— S-xxx.2 INSTALLATION

Compost used for grouting shall be pneumatically applied with blower equipment in a non-compacted layer to fill voids of riprap, fractured bedrock or other hard armor to a minimum of 2 inches depth, or as directed by the Project Engineer.

Compost Grout application for erosion control will be integrated with a sediment control program, and may be applied in concert with Compost Logs or other sediment control methods shown in the plan. The Compost Grout may be used to blend in the riprap or compost log edges to the existing slope grade. Approximately three quarters of the riprap void depth shall have the

fertilizer application, with the remaining one-forth topdress lift to have the seed, at rates per acre indicated in the plan.