Leanna Drive Creek Crossing Waterline Project
Summary
SCH Number
2014041079
Lead Agency
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
Name
Geoff English
Agency Name
City of Arroyo Grande
Contact Types
Lead/Public Agency
Phone
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
State Review Period Start
State Review Period End
State Reviewing Agencies
Cal Fire, California Air Resources Board (ARB), California Department of Fish and Wildlife, Central Region 4 (CDFW), California Department of Parks and Recreation, California Department of Transportation, District 5 (DOT), California Native American Heritage Commission (NAHC), California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, Central Coast Region 3 (RWQCB), Department of Water Resources, Office of Historic Preservation, Resources Agency, State Water Resources Control Board, Divison of Financial Assistance, California Department of Public Health (CDPH)
State Reviewing Agency Comments
California Department of Public Health (CDPH)
Development Types
Other (New Waterline Crossing Below Arroyo Grande Creek)
Local Actions
Roadway/Interchange
Project Issues
Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Drainage/Absorption, Flood Plain/Flooding, Geology/Soils, Hydrology/Water Quality, Noise, Public Services, Vegetation, Wetland/Riparian, Wildlife
Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above.