RES 09268 - Laserfiche WebLink

line. The water line increases in size to 12" at the intersection of Vermont Place and Staples Ranch Drive, approximately 120 feet from the Staples Ranch property. In addition to underground electrical connections in Staples Ranch Drive and Stoneridge Drive, there is also an existing 12kV overhead pole line along El Charro Road. PG &E is currently considering rewiring this to a 21kV line as part of a project to connect the Vineyard Substation in Pleasanton to the Tassajara Substation in Dublin, and to serve the planned El Charro Specific Plan area in Livermore. The Arroyo Mocho borders the Staples Ranch property to the south, within a channel that is approximately 250 feet wide, owned by Zone 7. In 2004, Zone 7, in coordination with the Alameda County Surplus Property Authority, completed the Arroyo Las Positas Realignment/Arroyo Mocho Widening flood control project. This project widened the Arroyo Mocho channel to its current size in order to contain the projected 100 year flood. This project also realigned the Arroyo Las Positas, which had formerly traversed the Staples Ranch property, so that it now utilizes a channel approximately 230 feet wide from a point approximately 1,200 feet east of El Charro Road (in Livermore), converging with the Arroyo Mocho at El Charro Road. In anticipation of the development of Staples Ranch, a 72 inch storm drain outfall (as well as several smaller outfalls) were installed during the construction of the Arroyo Las Positas /Arroyo Mocho Realignment Project in 2003 -2004 along the northerly bank of the Arroyo Mocho channel. The 72" outfall, located in the far southwestern corner of Staples Ranch, is currently served by a 36" line that picks up drainage along the westerly boundary of the Staples Ranch property. While the 2004 Arroyo Mocho Realignment project created adequate capacity to carry the 100 year flood event in the channel adjacent to Staples Ranch, the arroyos upstream of the Staples Ranch site are currently under capacity and predicted to overtop and send flood waters over El Charro Road and through the northern portion of the Staples Ranch site. However, flood protection improvements are planned to be constructed by Livermore as part of the El Charro Specific Plan, and as outlined in the 2007 Cost Sharing Agreement, which would remove Staples Ranch and much of the El Charro Specific Plan from the 100 year flood zone without impacting constrained stream channels downstream in Pleasanton. These improvements include a North Overbank Barrier and South Detention/Conveyance Facility along the Arroyo las Positas channel in Livermore. Livermore recently filed for a Conditional Letter of Map Revision (CLOMR) and is anticipated to construct the improvements and then file a Letter of Map Revision with the Federal Emergency Management Agency (FEMA) that would remove these Stoneridge Drive Specific Plan Amendment /Staples Ranch Draft October, 1008 50 L