Pine Lake Park Slope Restoration Project

design

NOTE: The Vale Parking lot and Pine Lake Park dog meadow are open but may experience temporary closures when equipment is being brought in or out of the park. We do not expect any impact to Stern Grove summer activities.July 2024 Update:Our engineers have completed an extensive survey of the impacted area and are now in the final stages of developing a slope stabilization and restoration design. This design will take into account how best to support existing infrastructure at that location including both the 60-inch water transmission line and a sewer main. A contractor has been engaged and construction work on the slope will begin once the completed design has been reviewed and approved. Initial construction is expected to begin in August, 2024.Background:On March 8, 2024, an 8-inch air valve connected to a 60-inch water transmission line failed, just below the end of the 1700 block of Wawona Street, above the Pine Lake Park dog park.  That transmission line feeds water from our treatment plant on the San Francisco Peninsula to the Sunset Reservoir, which is one of the largest serving the residents of the city.Water streaming from the air valve caused a geyser above the area which then flowed down a steep slope into the park, scouring a path to the park below until the crews onsite were able to shut the leak down.The week of March 11, 2024 the SFPUC identified a construction contractor and an engineering consultant who will work with the agency to determine a scope and schedule for repairs, including the hillside and the dog park area.Map is approximate and not to scale.  Blue area is the location of the impacted slope. Yellow area is the debris field.The first phase of work to prepare for restoration of the area was to remove hazardous trees.  That included all trees that became dangerously undermined by the scouring action of the water.  This work began on March 11th and was completed on March 21st.The second phase of work involved covering the affected area of the slop with plastic sheeting to prevent further erosion. That work was completed on March 22nd.