Street Maintenance CIP

Rehabilitation/Slurry Seal

Over the years, a combination of heavy traffic, water infiltration and aging can contribute to asphalt and concrete deterioration.  As part of its ongoing effort to proactively maintain and upgrade aging City asphalt roadways and concrete infrastructure (curbs, gutters, sidewalks and access ramps), the City of Irvine Public Works Department continues to provide annual street maintenance Capital Improvement Projects (CIPs).

Concrete repairs in designated locations of The Colony and College Park were completed July 2015.

Resurfacing of streets in West Irvine, The Colony and College Park scheduled to begin in late July 2015 and be completed by October 2015.  To see project locations, please click on the link “Project Maps”.

The work will be performed by a City contractor.  City staff will monitor the contractor’s daily activities to ensure work is being performed to City standards.

Prior to work beginning, affected residents and businesses should receive a Street Maintenance Notice (See Sample Notice).

Temporary “No Parking” signs will be posted 72 hours prior to work commencing on any street.  Please observe these notices as vehicles parked on a street with a posted “No Parking” sign will be towed. On the day of construction, collector and arterial streets will have restricted traffic. Posted residential streets will have restricted parking and access may be delayed or restricted while the work is being performed.  Alternate parking is allowed on adjacent streets not posted with “No Parking” signs.

Work activity in residential neighborhoods and local streets will generally take place Monday through Friday between the hours of 8 a.m. and 4 p.m. Work on arterial streets will generally occur Monday through Friday between 9 a.m. and 3 p.m. If necessary, weekend work on arterial streets will also occur between 7 a.m. and 5 p.m.  Please note that existing parking restrictions will be enforced in the affected areas.  Trash pick-up services will not be disrupted.

New street surfaces will be ready for use several hours after application, and the City will work closely with the contractor to minimize inconvenience to motorists, residents, and businesses.  However, delays due to temporary lane and street closures should be expected.

Individuals who need more information or require special consideration may contact the Public Works Department at 949‑724-7600 or at

What is Slurry Seal?

Slurry Seal is a mixture of emulsified asphalt (oil), water, fine crushed rock and sand.  It is a surface applied treatment designed to extend the life of existing streets in two ways.  It helps to maintain the integrity of the roadway by filling surface cracks and voids.  By replenishing roadway surface oils, it also acts as a water repellent cap, shedding water into the gutters and preventing water damage to the subsurface of the street.

Slurry Seal is only used for preventive maintenance and is designed to extend the life of a pavement.  It will not improve the ride quality of a street.

The Construction Process

Application of Slurry Seal is a two-step process.  First, surface cracks are filled and surface patching is done.  There is no parking on the affected street on the day this takes place.  Notices will be posted beforehand.  Several days after the crack sealing and surface patching, the Slurry Seal is applied.  Streets will be closed to both parking and driving during the application although limited driving will be allowed in case of emergency.  Normal driving and parking will be allowed after the Contractor removes the No Parking signs at the end of the working day.

Slurry Seal requires only a few hours to dry before traffic can drive over it but it takes 24 to 48 hours to cure completely.  During the first few weeks after the slurry seal application, residents should avoid excessive steering of their vehicle while it is standing still, or starting or stopping quickly as this may cause tire tracks and scuff marks on the surface.

What is Street Rehabilitation (Asphalt Paving)?

Street Rehabilitation (Asphalt Paving) consists of cold milling, installation of pavement fabric and an asphalt concrete overlay.

Cold Milling (also referred to as grinding) is the controlled removal of the surface of the existing pavement to a pre-determined depth with specially designed milling equipment.

Pavement fabric, a strong layer of stress absorbing fabric, is installed once milling is complete to minimize surface water infiltration and prevent existing cracks in underlying layers of the road from surfacing.  Pavement fabric can extend the life of asphalt overlays significantly.

Asphalt overly, also known as Asphalt Concrete or A.C., is a mixture of asphalt oil, crushed rock, gravel, and sand.  Typically, a 2” thick layer is applied over pavement fabric to provide improved ride quality and extend pavement life.

The Construction Process

The first step in this process is to cold mill the existing asphalt pavement along the edge of the gutters to allow a smooth transition for the asphalt overlay.  During this process, on-street parking will be prohibited during work hours.

Next, a pavement fabric is placed over the street to improve the integrity of the overlay and immediately after, an asphalt overlay is placed on top of the fabric.  During this phase, on-street parking is prohibited and the street will be closed or restricted to vehicular traffic.  Once the asphalt is placed and compacted, the street is reopened to traffic the same day.

When the asphalt overlay is completed, all manholes and valve box covers are raised to grade; and then the streets are re-striped and re-painted.

Photo courtesy of Propex/SI

Construction Protocol and General Project Information

The City looks forward to a successful project and to that end asks your cooperation by:

  • Keeping children and pets away from the construction;
  • Keeping persons or animals that may be sensitive to construction-related activities (i.e. noise-sensitive or vibration-sensitive) at a safe distance;
  • Adhering to the No Parking notices;
  • Not running water onto the street the night before or during the application;
  • Not driving on the Slurry Seal before it has properly cured to avoid damaging both the integrity of the surface and, in some cases, the vehicle's paint; and
  • Avoid steering your vehicle while stopped, and starting or stopping quickly during the first few weeks after the application to avoid marring Slurry Sealed surfaces.

Thank you for doing your part in helping us extend the life of Irvine’s roadways!

Please contact the Public Works Department for any questions or special requirements you might have at 949-724-7600 or at