Gravel Delivery in New Hampshire

The state geologic map shows a long list of hard rock at the center point of Manchester: gneiss, biotite schist, granofels, calc silicate rock, granite and migmatite. These are crystalline rocks, formed or reshaped deep underground under heat and pressure. Most of them are dense, tough and slow to wear.^[1]

Rock like that makes durable crushed stone. Granite and gneiss break into hard, sharp pieces that keep their edges under traffic, which is what a driveway surface and a compacted base need. Biotite schist splits more easily along its flat mica layers, so a quarry working schist may yield flatter pieces. For a buyer, crystalline country means crushed stone with good strength and a speckled grey look.^[1]

Loose material in this part of New England often comes from what old glaciers left behind. Melting ice dropped sand and gravel in broad layers and ridges, and pits dig those deposits for washed sand, round gravel and screened stone. That history makes sand and round stone common in the region, alongside crushed rock from quarries in the bedrock.^[1]

The USDA soil survey reads loamy sand at the Manchester center point and classes it excessively drained. That is the fastest drainage class there is. Water drops through loamy sand within a short time of a storm, and the ground dries out quickly afterward. Sandy ground like this makes a stable, free draining subgrade for stone, and a hungry, thirsty soil for plants.^[2]

The ground at the Manchester center point stands 200 feet above sea level. That is a single spot on the map. Lots on a hillside or a ledge can sit well above it and lots near a river well below, so look at your own slope and how water moves across it before you plan a drive or a patio.^[3]

Ledge, where bedrock comes close to the surface, can turn up on any rocky lot in crystalline country. Where it does, a drive or a patio may need to be built up with fill and base instead of dug down into the ground. Fill Sand and Road Base are the usual materials for raising a grade over shallow rock.^[1]

Snow drives most of the delivery planning. The weather station used for Manchester averages 52.8 inches of snowfall a year. Before a winter load, plow the drop spot and the route to it, and set tall stakes along the edges of a drive so the driver can find them under the snow. Plowed banks shrink a lane fast, so tell Gravel Valet about tight turns or narrow entries when you order.^[4]

The same Manchester station logs 161 days a year at 32 F or colder. The Manchester count covers individual cold days across fall, winter and spring, many of which warm above freezing in the afternoon. Each thaw and refreeze works on the top of the ground. Frozen sand carries a truck well. During a thaw, the surface can be greasy even on sandy ground.^[4]

Precipitation at the Manchester station averages 42.5 inches a year, rain and melted snow together. On excessively drained loamy sand, most of that soaks in quickly, so a lawn tends to firm up soon after a storm. That makes sandy lots friendlier to a dump truck than clay ones. A yard that has just thawed in spring is still the one time to keep the truck on the pavement.^[2],[4]

Wooded lots call for a look overhead. A dump bed rises high as it tips, and pine limbs, oak branches and service wires can block it. Old stone walls, narrow gates and steep, curving drives are common in older New England neighborhoods, and each one changes where a truck can stop. Pick a drop spot with open sky above it and firm ground below.^[1]

Sand piles move in wind and rain. If Mason Sand, Concrete Sand or Playground Sand will sit for a few days, cover the pile with a tarp. Loose sand in a pile on sandy ground can also blend into the soil around it, so a tarp under the drop keeps the material clean and easy to shovel to the last scoop.^[2]

Gravel driveways are the most common order in Manchester. On excessively drained loamy sand, the subgrade drains well, so fabric is less critical than on clay. Strip the topsoil, grade a crown, compact the sand, then build Road Base or Crushed Concrete in thin, compacted lifts. A surface of Driveway Gravel or 3/4" Crushed Stone binds into a firm top that stands up to the plow. Give the drive a shallow ditch or a strip of stone along the low edge, so spring melt from the snow banks has a place to soak into the sand.^[2]

Winter shapes the surface choice. With 52.8 inches of yearly snow at the Manchester station, a plow or a snowblower will scrape the drive many times each season. Clean round stone such as Pea Gravel gets thrown onto the lawn. A top layer with some fines, packed and crowned, holds together better and sheds melt water to the sides.^[4]

Frost is less of a worry on sand than on clay, since sand drains before it can freeze solid. It still pays to keep fine soil out of the base. With 161 days at 32 F or colder logged at the Manchester station, any pocket of wet fines can lift in a hard freeze and leave a bump in spring.^[4]

Garden beds on loamy sand need help holding water. Mix generous amounts of Compost or Garden Soil into the sand, or raise the bed with Topsoil, so roots have something that stays moist between rains. Cover the bed with Brown Shredded Mulch or Black Shredded Mulch to slow drying in summer. River Rock and Decomposed Granite make low care borders along walks and foundations.^[2]

Drainage jobs on sandy ground tend to be smaller. Roof runoff is the usual problem, and a dry well or a short trench filled with Drain Rock or #57 Crushed Stone can take a downspout's flow and let the sand absorb it. Where a slope sends water down toward a road or a bank, Riprap stops the edge from washing away.^[2],[4]

Patios and paths finish the list. Pavers sit on compacted Road Base with a thin bed of Concrete Sand or Stone Dust Screenings. Walkway Gravel and Pea Gravel make simple paths through a yard, and Wood Chips suit a trail under trees. Playground Sand gives a soft surface under a swing set.^[2]