Tri Valley Concrete and Landscape Materials offers a large selection of bulk materials; Bark, decorative rock, soil mixes and construction material stocked in over thirty bulk bunkers. Mini Bark, Small Bark, Medium Bark, Black Bark (Mini and Small), Gorilla Hair (Also available in Black), Walk on Bark and colored wood chips for your mulch selections. Noiyo River Rocks, Ginger, Black and White, Lodi, Lave Rock (Black, Red and Brown) decorative rocks. Base rock, masonry sand, fill sand, construction sand, drain rock and more in construction materials. Planters mix, premium garden mix, compost and fill soil also available.