Gravel Delivery in Rhode Island

The state geologic map reads anthracite at the Providence center point. Anthracite is the hardest form of coal, black and shiny, formed when old swamp layers were buried and squeezed far more than ordinary coal. The rock around such seams tends to be dark shale, sandstone and conglomerate, pressed hard by the same forces. None of it makes good driveway stone, since coal and shale break down under wheels and weather.^[1]

Most of the stone used in yards here comes from what the glaciers left. Ice sheets scraped across New England, picked up rock of every kind, and dropped it as they melted. Meltwater sorted that load into beds of sand and rounded gravel. Pits in deposits like these wash and screen the material into Pea Gravel, River Rock, Concrete Sand and Mason Sand. Harder bedrock from quarries is crushed into the angular sizes, such as #57 Crushed Stone and 3/4" Crushed Stone, that lock together in a base.^[1],[2]

The soil reflects that glacial past. The USDA soil survey reads gravelly fine sandy loam, well drained, at the Providence center point. Gravelly means small stones are mixed through the soil. Fine sandy loam is mostly sand with some silt and a little clay. Together they make ground that drains quickly and packs firm, a good start for a gravel drive or a paver patio.^[2]

Ground like this has a few quirks. Stones in the soil can make digging slow and leave lumps that a plate compactor rides over. Rake out the larger pieces before a base goes down so the layers sit even. Because water moves through it fast, gravelly sandy soil also dries out quickly in summer, which matters for lawns and beds more than for stone. A layer of fabric between soil and base still helps, since it keeps the two from mixing as the years go by.^[2]

Rain and snow both arrive in good amounts. The weather station used for Providence averages 47.5 inches of precipitation a year and 36.6 inches of snow. Coastal storms can bring heavy rain or wet snow in a single day. Well drained ground recovers fast after a storm, but a lawn soaked the same morning can still rut under a loaded truck. A drop on the driveway or at the curb is the safe choice right after heavy weather.^[2],[3]

Cold weather lasts a long time. The Providence station counts 109 days a year at 32 F or colder. Base stone should go down on thawed ground so it can be compacted into a firm layer. Stone dumped on frozen soil sits loose on top and settles unevenly when the thaw comes. Surface stone and mulch are more forgiving and can be spread on a mild winter day if the drop spot is clear of snow and ice.^[3]

Older city streets are tight. Many Providence lots are narrow, with shared driveways, houses close together, on-street parking and low wires. A dump truck needs a firm patch about as long as the truck, room to raise its bed and nothing overhead. On a narrow lot, the driver may drop the load on a tarp at the curb, and the stone then moves by wheelbarrow to the back.^[2]

Plan the pile spot with care. Put it as close to the work as the truck can safely reach, out of the way of cars and neighbors. Cover Topsoil, Garden Soil and sand with a tarp if rain is coming, so the pile does not wash into the street. Gravel Valet can drop on a tarp to keep stone dust off a paved drive. Mark sprinkler heads, curb stones and buried lines before the truck arrives. A load of stone is heavy, and a full truck can crack a thin walk or a cellar door that sits flush with the ground. Point these out to the driver, along with any spot where a retaining wall stands close to the drive.^[3]

Gravel driveways and parking pads lead the list. On the well drained gravelly fine sandy loam at the Providence center point, strip the topsoil, rake out the large stones, and lay fabric. Compact a layer of Road Base or Crushed Concrete in thin lifts, then top it with Driveway Gravel or 3/4" Crushed Stone. Crown the surface so rain and melt run to the sides. Angular stone locks and stays put better than round stone when a car turns on it.^[2]

Snow removal shapes the top layer. With 36.6 inches of snow a year at the Providence station, a drive gets plowed or blown several times each winter. A firm, well compacted surface holds up best. Set the plow blade a little high, or use a shovel with a plastic edge, so the stone stays on the drive. Asphalt Millings pack into a hard, dark surface that handles plowing and sheds melt.^[3]

Frost is the other force on a base. On the 109 days a year the Providence station logs at 32 F or colder, any water left in the base can freeze and push it up. Gravelly sandy ground drains fast, which helps, but a low spot that collects runoff can still heave. A coarse layer of #4 Crushed Stone or 1-1/2" Crushed Gravel under the Road Base keeps water moving down and out.^[2],[3]

Drainage projects handle roof water. With 47.5 inches of precipitation a year at the Providence station, downspouts can carve holes beside a foundation. A splash pad of River Rock spreads the flow. A trench filled with Drain Rock or #57 Crushed Stone, wrapped in fabric, carries water away from the house. On well drained ground, a dry well of clean stone lets the water soak in quickly.^[2],[3]

Patios, paths and gardens finish the list. Set pavers on compacted Road Base and a bed of Concrete Sand, then sweep Mason Sand into the joints. A garden path of Walkway Gravel, 3/8" Crushed Stone or Pea Gravel drains well and stays firm. Fast draining sandy soil dries out in summer, so beds benefit from Compost and Garden Soil worked in, and from a cover of Black Shredded Mulch or Brown Shredded Mulch. Playground Sand or Wood Chips suit a play area. Edging made of steel, stone or timber keeps gravel paths from spreading into the lawn, and a strip of fabric under the stone slows weeds for years.^[2]