SU0014674 - Laserfiche WebLink

Home Browse Search

either Farmer owned or BBID owned run-off conveyance lines. Water occurs in these ditches temporarily during the irrigation season. These tailwater ponds are visible on the contour information included on the face of the Subdivision Map. In addition, two subsurface pipes traverse the property along Mountain House Parkway. These pipes, owned and operated by BBID convey both subsurface ground water collected beneath the site and adjacent parcels and tail water runoff from the surface application of irrigation on fields. Irrigation service to the subdivision site will be terminated back to the where the BBID canal crosses Mountain House Creek. Pipes from the new terminus will be extended beneath the creek to continue service to the agricultural fields north of the subdivision. Existing BBID subsurface pipes will be intercepted along the south of the subdivision, where the waters from both the ground water and tail water pipes will be connected to and discharged into the proposed storm water pipes to be constructed within Mountain House Parkway. Existing groundwater conveyance pipes located north of the subdivision along Byron Road will be left intact to continue subsurface drainage for farm fields along Byron Road. Improvement plans, which reflect this plan, will be reviewed with BBID and will be subject to their approval, as well as the approval of the CSD. Additional detailed information regarding the Farm Irrigation is included in Section 12 of this Binder, Farm Irrigation and Groundwater Report. According to preliminary studies performed on the Neighborhood F project site, groundwater is known to occur at seasonally varying elevations of between 8 and 12 feet below grade. These elevations are directly influenced by on-going seasonal surface irrigation practices. Conclusions of these investigations indicate that although construction-related dewatering NIVili be required for the installation of deep infrastructure pipes, that no ongoing `'permanent" dewatering will be required for this area, as protection against landscaped areas, or structural stability for improvements for private development. Further, it is anticipated that over time as more agricultural areas are converted to urban use within the Mountain House Community,that ground water levels caused by irrigation will continue to decrease. Other future development areas located north of Byron Road may likely require a permanent system. Groundwater issues will be addressed as part of future'Specific Plans and subdivision requests for those areas. These discussions are generally described in the Farm Irrigation and Groundwater Report included in Section 12 of this Binder. Further, more specific studies will be evaluated as part of Improvement Plan preparation and plan check with the CSD. YXIV.STORM DRAINAGE In accordance with the Master Storm Water Plan, and as proposed within the Neighborhood F Storm Water Plan, Trimark Communities will construct a series of both interim storm water protections ditches and berms, as well as build-out level storm water conveyance facilities as an oversizing component of the first subdivision development. These facilities will include the following: • A perimeter ditch around the south and west side of the neighborhood to intercept surface water sheet flows, • A series of minor grading excavations as well as perimeter berms adjacent to the Mountain House Creek corridor to keep creek storm flows within the existing flood basin, • Construction of storm water conveyance pipes within the De-Anna and Mountain House Parkway roadway corridors to convey off-site sheet flow and intract runoff flows to and under Byron Road, and will discharge into an interim discharge channel/water quality basin prior to discharge further north into Mountain House Creek and onto Trimark-owned agricultural fields, MAJOR SLBDIVISIO`i-TRACT 2925 PROJECT DESCRIPTION Page 13