Asphalt Paving in Shell Ridge, CA

Asphalt paving in Shell Ridge serves a small, owner-occupied neighborhood beside the Shell Ridge Open Space, which the City of Walnut Creek describes as its largest open space area, with 31 miles of trails. The unincorporated neighborhood had 377 homes in 2020, and 90.7 percent of occupied homes were owner-occupied. Lots slope, and runoff from the open space is a common issue.

County rules

Shell Ridge sits outside city limits, so Contra Costa County Public Works handles encroachment permits. Its conditions set a minimum asphalt driveway of 2 inches over 6 inches of Class 2 aggregate base, and the top of a driveway 5 feet behind the curb must sit 7 1/4 inches above the gutter flow line.

Runoff

Homes near open space receive water from undeveloped slopes. We grade new driveways to collect and route that water, and support edges against erosion.

Long-term owners

With most homes owner-occupied, owners tend to invest in a full rebuild rather than repeated patches.

Maintenance

Sealcoat and crack sealing keep a newer driveway in shape through dry summers and wet winters.

Typical Shell Ridge projects

Most work in Shell Ridge is on driveways that face runoff from the open space above. We see edges undermined by water, cracks that have let water into the base, and low spots near garages. A new driveway here usually includes a raised edge or berm on the uphill side to catch water, a planned outlet to the street, and a compacted base deep enough to stay firm through wet winters. For driveways in good structural condition, crack sealing and sealcoat in late summer keep them that way. Average household size is 2.76, and about a third of households include children, so we keep work areas tidy and safe.

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