Order Class 2 Base and Crushed Stone in Contra Costa County, CA
California Rock Supply delivers gravel, stone and aggregate delivery in Contra Costa County, CA. The dry season from late spring into fall is the window most buyers aim for, because winter rain and saturated clay are what hold jobs up. Order Class 2 base early and you can compact and pave before the first big storm.
Class 2 base is the material most jobs here start with. It is the standard California base, specified by Caltrans Standard Specifications Section 26 as Class 2 aggregate base. Soils change over short distances in this county, so the base depth you need depends on what is under it.
Materials Delivered in Contra Costa County
Class 2 base, also called Class II base or Class 2 base rock, is the compacted base under drives, parking pads, pavers, slabs and Stone Screenings paths. Caltrans specifies it in a 3/4 inch or 1-1/2 inch maximum grading, and Class 2 is the higher-strength grade. It is the right call under anything that carries weight.
Recycled base rock is Class 2 base made from Road Base or asphalt. Caltrans allows processed reclaimed asphalt and concrete in aggregate base, so recycled Class 2 base does the same work under drives, patios and slabs. Some suppliers also sell it as crushed miscellaneous base, or CMB.
Ground Conditions Across Contra Costa County
A thin base is what fails first here. On heavy clay, a base that is too shallow pumps, shifts and cracks when the clay swells in winter and shrinks in summer. The fix is depth and compaction, not a different stone.
Sandy dune and beach soils sit along parts of the shoreline, and they drain fast. That helps in winter but means the base needs to be compacted hard so it does not move under a load. Heavy clay soils that crack when dry and swell when wet are extensive in the Coast Range valleys and hills.
Most rain falls from late fall to spring, much of it in a few large winter storms and atmospheric rivers. It soaks into sandy ground quickly but sits on or runs off clay soils and slopes. That is why drainage matters as much as base on hillside work.
Hillside runoff and slides on steep slopes in winter storms are the local erosion driver, along with wave and storm erosion of sea cliffs and bluffs along the shoreline. RipRap and drain rock are the materials that answer both.
Delivery Across Contra Costa County
Delivery framing starts with quantity. Aggregate is ordered by the ton or by the cubic yard, and the two are not the same number. A yard of Class 2 base weighs more than a yard of mulch, so know which unit you are pricing before you order.
To estimate, measure the area and multiply by the depth you want, then convert to tons or yards. A base course is usually placed in lifts at a minimum depth of 2 inches and compacted between them.
We deliver to Concord, Richmond, Antioch, San Ramon, Pittsburg, Walnut Creek, Brentwood, Oakley, Danville, Martinez, Pleasant Hill, San Pablo, Hercules and El Cerrito. Bulk delivery drops the load where the truck can reach, so tell us if the placement is up a slope or behind a gate.
Choosing the Right Material
Ground next door is not always the same ground. San Joaquin County sits on the Central Valley floor, where heavy clay cracks in summer and a cemented hardpan a few feet down stops water moving deeper. That hardpan changes the drainage plan, so base and drainage rock are often specified together there in a way they are not here.
Alameda County and San Francisco County share this county's Coast and Coast Ranges zone. Their ground is similar to Contra Costa County's: sandy soils near the shoreline and swelling clay in the valleys and hills. The material choice differs mainly by project, with shoreline work leaning on drain rock and valley work leaning on Class 2 base.
Use the same reasoning here. Match the base to what is under it, then choose the surface for how the space gets used. For a drive, compacted Class 2 base under driveway gravel. For a path, base under Stone Screenings. For a wet slope, drain rock and RipRap.
Order Class 2 Base, Crushed Stone and Sand for Your Contra Costa County Job
Start with the calculator to work out your tonnage or yardage, then place the order online. Ordering by the yard or the ton keeps the quantity clear, and it helps to have your depth and area measured first. California Rock Supply delivers bulk aggregate across Contra Costa County, so tell us where the load goes and we will bring the material to the job site.