ARCHIVED REPORTS_1981 - Laserfiche WebLink

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• The fundamental principle for minimizing erosion is to limit the duration of exposure of bare soils to natural erosive forces. This can be achieved by careful scheduling and limiting the extent of clearing and excavating to minimize the amount and duration of exposed, disturbed soil. Within the limits of reason, as much of each filled disposal trench as possible should be closed and revege- tated prior to significant rainfall each year. • -As each trench is filled and closed, the top 18 inches of the final cover should be from the stockpiled topsoil. This will permit rapid ^revegetation and soil stabilization. • A quick, short-term vegetation stand foraerosion control may be estab- lished on closed trenches -by seeding.with barley or wheat then raking toOllightly into surface soil. If desired, permanent cover vegetation seed, which takes longer to become established, may be seeded simul- taneously for long-term protection. Table 12 should be used as a seeding guide. At the time of seeding or just prior, fertilizer may be applied to accelerate establishment at a minimum rate of two pounds of available nitrogen and two pounds of phosphoric acid per ,1,000 square feet. Using a fertilizer composition of 10-10-0 (nitrogen - phosphorus -potassium), this would be the equivalent to 20 pounds per 1,000 square feet. Seeds may be applied by hand broadcasting or with a range seed drill followed with a light harrow and a seed bed roller. An application of straw or wood fiber mulch to the seedbed not only would aid in establishing vegetative cover, but would provide temporary erosion control until permanent vegetation is established. HYDROLOGIC CONDITIOJS/WATER QUALITY Measures Proposed by Applicant • The erosion control measures discussed in the soils mitigation section will also protect surface water quality by minimizing runoff silt loads. • A siltation basin will be constructed to collect all surface runoff and permit suspended particulates to settle our prior to discharge of runoff. All runoff collection and conveyance structures will be designed for a one chance in a hundred probability storm. • The top surface of the landfill will be graded so that surface runoff will drain away from the refuse disposal operation. • Collection and diversion structures will be constructed about the periphery, as appropriate, to prevent off-site runoff from entering the proposed site. 5G