Soil Blends are mixed on-site in Fairview, Oregon combining multiple amendments into a useful blended topsoil. All soil blends include our own Screened Compost that is US Composting Council Approved. 5-Way Soil Blend consists of 40% Fine Fir, 30% Compost, 10% Mushroom Compost, 10% Pumice, and 10% Sand.