for Highway Construction Page 588 of 715 SECTION 654 – COMPOST
654.01 Description.
Provide and apply compost on dist urbed areas, which include areas within the right of way where existing vegetation has been removed or new construction areas, including haul roads. Contact the Engineer before applying compost. Apply as a temporary and permanent erosion control measure m eeting all applicable portions of 212.03.
654.02 Materials.
Provide compost homogeneous in color (e.g., dark loam), with an earthy smell (i.e., not odiferous), and that contains no visible straw or organic or inorganic trash (i.e., maximum of 0.5 percent plastic and less than 1 percent for other trash). Completely decomposed material will be evidenced by total breakdown of raw ingredients and lack of odor or heat generations (i.e., mature and stable exhibiting no anomalous hot -spots).
1.Solvita maturity tes ting: ammonia (NH3) and carbon dioxide (CO2) respiration or temperature self - heating tests (may not reheat to 66°F (20°C) above ambient temperature).
2.Combination evolution rate is greater than 6.
3.Conductivi ty testing is les s than 5 mmhos per centimeter and no greater than 15 mmhos per centimeter.
4.PH of 5.5 to 8.2.
5.Sieve testing requirements: must be friable and pass through a minimum 1 inch- screen.
6.Maximum nutrients allowable:
a.Nitrogen, total (TKN): 1.8 per cent dry weight.
b.Phosphorus total: 3.3 percent dry weight.
7.Maximum physical contaminants (i.e., manufactured manmade inerts):
a.Plastic: 0.5 percent dry weight.
b.Concrete: 1 percent dry weight.
c.Ceramics: 1 percent dry weight.
d.Metal: 1 percent dry weight.
e.Other: 1 percent dry weight.
8.Percent moisture allowable: 0 to 35 percent.
9.Must be certified noxious weed free. The supplier or the Idaho State Department of Agriculture (ISDA) Seed Laborator y will sample every 500 tons of c ompost. Compost tests will be completed and certified by a NAPT -PAP or an independent Seal of Testing Assurance Program -certified laboratory. The following labs are accredited to perform the required tests:
1.Stukenholtz Laboratory; Twin Fall s, ID. for Highway Construction Page 589 of 715 2. Northwest Agriculture Consultants; Kennewick, WA.
3.University of Idaho, Analytical Science Laboratory; Moscow, ID. Certifications. The supplier will provide records of row temperature, turning schedules, and noxious w eed free certification by the ISDA. Provide a copy of the production schedule and noxious weed free certification. The compost portion will meet the chemical, physical, and biological properties outlined.
654.03 Construction Requirements.
For sl opes up to 3H:1V, distribute compost evenly to all areas to be seeded at the rate of 110 to 140 cubic yard per acre, and incorporate the compost into the soil in preparation for drill seeding. For slopes st eeper than 3H:1V, apply compost t o the soil surface at the rate of 140 to 300 cubic yards per acre using a pneumatic blower with a calibrated seed and tackifier injection system. For areas less than an acre, the compost may be hand placed and lightly incorporated into the soi l before seeding begins. Any site with erosion problems, especially due to wind may require compost more than 2 inches thick, and may take more than 2 applications as directed. The Engineer will evaluate the erosion potential and discuss with the Contractor before the first application. These applications will take place within 5 calendar days following the work within the designated area, unless otherwise specified or directed. This time limit may be shortened if wind or precipitation cause erosion or sediment problems.
654.04 Method of Measurement.
The Engineer will measure acceptably completed compost by the acre parallel with the slope based on planned quantity for each time this work is performed.
654.05 Basis of Payment .
The Department will pay for accepted work as follows: Pay Item Pay Unit Compost ................................................................................................. Acre for Highway Construction Page 590 of 715 SECTION 655 - RESERVED
Source: Idaho Standard Specifications for Highway Construction, 2023 Edition. Pages 624–625 of 768.