Leanna Drive Creek Crossing Waterline Project

Summary

SCH Number
2014041079
Lead Agency
Arroyo Grande, City of (City of Arroyo Grande)
Document Title
Leanna Drive Creek Crossing Waterline Project
Document Type
MND - Mitigated Negative Declaration
Received
Present Land Use
The sit eis an existing utility easement that crosses through a mobile hoem park, a creek and agricultural land Z & GPD where work will occur is agriculture and open space

Document Description
The existing water line crossing Arroyo Grande Creek was installed in a concrete encasement that is being undermined by stream flow and settling. Record drawings show that the concrete encasement is not reinforced with steel and is therefore unlikely to withstand tension abandoned sewer force main encasement, which was constructed at the time as the water main, shows strong evidence of cracking and differential settlement indicating failure of the encasement and the encased pipeline. Failure of the water main would have immediate consequences of loss of potable water, potential contamination, and reduction in fire-fighting capabilities. The existing 8-inch ductile iron pipe and concrete encasement will be abandoned and replaced at this location with approximately 450 feet of new high-density polyethylene (HDPE) pipe. This endeavor will not only preserve the integrity of the City's potable water supply and fire-flow capability, but prevent the above-mentioned secondary consequences. The City has suggested an approach utilizing horizontal directional drilling to replace the existing line with a 12-inch HDPE pipe. This will allow construction activities to remain outside of the creek floodplain encroachment area and minimize the impact to the existing creek. No excavation will be performed within the creek bed, as a determination has been made that the project will not include removal of the existing pipelines and exposed concrete encasements.

Contact Information
Geoff English
City of Arroyo Grande
300 East Branch Street
San Luis Obispo, CA 93420

Phone : (805) 473-5460

Location

Cities
Arroyo Grande
Counties
San Luis Obispo
State Highways
Hwy 101, 1
Railways
SPRR
Airports
Oceano County
Schools
Harloe ES, Fairgrove ES, Arroyo Grande HS
Waterways
AG Creek

Notice of Completion

Review Period Start
Review Period End
Development Type
Other (New Waterline Crossing Below Arroyo Grande Creek)
Local Action
Other Action Other Action: Roadway/Interchange
Project Issues
Agricultural Land Air Quality Archaeologic-Historic Biological Resources Drainage/Absorption Flood Plain/Flooding Noise Public Services Soil Erosion/Compaction/Grading Vegetation Water Quality Wetland/Riparian Wildlife
Reviewing Agencies
Air Resources Board Cal Fire California Department of Parks and Recreation California Public Utilities Commission Caltrans, District 5 Department of Fish and Wildlife, Region 4 Department of Water Resources Native American Heritage Commission Office of Historic Preservation Regional Water Quality Control Board, Region 3 Resources Agency State Water Resources Control Board, Divison of Financial Assistance California Department of Public Health
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