1. Prepare spray seeding materials: prepare the required spray seeding materials for exotic soil according to the construction plan, including exotic soil, pollution-free water source, active oxygen particles, etc.

2. Check the construction equipment: ensure that the spraying equipment is in good condition and meets the use requirements.

3. Soil preparation: remove obstacles such as weeds and stones in the construction area to ensure the slope is smooth. According to the characteristics of soil, necessary soil improvement treatment is carried out, and the pH value of soil is adjusted by using customized proportion of active oxygen granular materials to increase organic matter.

4. Spray sowing scheme design: Design spray sowing scheme according to engineering requirements and soil conditions, including spray sowing area division and spray sowing thickness.

5. Spray seeding operation: According to the spray seeding plan, spray seeding equipment will be used to spray the foreign soil spray seeding materials evenly in the construction area. Spraying substrate is an important factor to ensure the success of spraying. Active oxygen particles and wood fibers can be mixed in a certain proportion to obtain better adhesion and water retention.

6. Post-spraying treatment: water spraying, rolling and other follow-up treatments are carried out as needed to ensure that the foreign soil can be fully integrated with the existing soil.

7. Construction acceptance: organize relevant personnel to accept the construction area, and evaluate the spray seeding effect of foreign soil.

Generally speaking, the thickness of spray seeding is between 10 ~ 20 cm. This thickness can ensure that the spray seeding material can cover the slope, provide sufficient nutrients and water retention capacity, and promote the growth of vegetation.

In spray seeding materials, active oxygen particles can be used in exotic soil. The proportion of active oxygen particles can be adjusted according to the actual situation and the type of vegetation to be restored. The amount of active oxygen particles is usually added under the guidance of professionals. Active oxygen particles can improve soil environment, avoid soil hardening, promote plants to take root and strengthen roots, and enhance adaptability. It can also produce plant hormones and other functions, which is helpful for the rapid rooting and growth of plants.

The above information is for reference only, and the specific construction steps and material collocation may be different due to engineering requirements and local conditions. In practice, it is recommended to consult professionals and make adjustments according to the actual situation.