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
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.
Air Resources BoardCal FireCalifornia Department of Parks and RecreationCalifornia Public Utilities CommissionCaltrans, District 5Department of Fish and Wildlife, Region 4Department of Water ResourcesNative American Heritage CommissionOffice of Historic PreservationRegional Water Quality Control Board, Region 3Resources AgencyState Water Resources Control Board, Divison of Financial AssistanceCalifornia Department of Public Health