The best fill or earthen materials that are base elements in construction or building could be found in or near rivers and by the seaside. The sea however provides too much saline chemistry that products like these taken from it is harder to process. The freshwater courses offer the best options for operations that take out these products for consumers.
Rivers have plenty of places where these could be found, and their sides, shores or nearby areas are often composed of these natural products. Riverside sand and gravel could even be a generic definition of so many operations that produce quality items for building. Again, the said items are basic, for fill, for mixing to make concrete or road surfaces.
Gravel and sand are defined according to the sizes in which they are produced. Sand is defined as a finer substance that could have several standards for grades. There might be rougher items, or really fine ones and for gravel, the size of the stones should often be uniform according to what is needed as standards in any phase of construction.
The company which processes these materials also need to produce graded items. This could be more expensive though and often some construction outfits could have varied needs that might change in an instant. They often order a gravel and sand standard that stands outside the maximum envelope for sizing they need.
They could further process their things according to the sizes that might be demanded or needed for progressive phases of construction. These could necessitate the use of crushers and refining equipment. These ideally break up bigger rocks or sand into more refined or smaller sizes for things like concrete finishing.
Finishes always use the finer stuff, while base layers could have the rough items in ideal for bonding or filling in gaps and spaces. The construction of good, solid surfaces for instance will ideally need different sizes of rocks or grains. The layering may be different according to the parameters provide by the onsite engineers.
These will decide which grades could work best, and again the further processing of the delivered stuff is relevant. The materials provider could do the grading themselves, and for rush work their products could be very useful. When there is no time to crush rocks into more refined pieces, they could provide the precise dimensions of materials to be used.
Riverside excavations will need permits or licenses to operate from local or state governments. Protected areas cannot be mined or excavated in this way, because they could have some nasty environmental impact. Parts of rivers that are used this way are often restricted to the public or public use.
Companies working these licenses will need to make their process follow all EPA and local rules with regards to safety and taking care of the surroundings. Trees are not just cut, and earth cannot be dug without putting forward a plan that is approved by government inspectors. The rules are strictly enforced in this, similar to mining concerns.