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Water Quality_ <br /> <br /> Water from the State Water Project is surface water which is treated and <br /> disinfected by Zone 7. The quality of this water, which comprises about <br /> three-quarters of Pleasanton's supply, is good although occasional taste <br /> and odor problems occur in the summer months. Groundwater taken from <br /> the City's wells is lower in quality with total dissolved solids averaging <br /> from 400 to 550 milligrams per liter (mg/1). The City uses groundwater <br /> to fully utilize the 3,500-acre-feet-per-year groundwater allocation called <br /> for in its agreement with Zone 7 and to meet maximum day demands <br /> during the summer months. <br /> <br />c. Storm Drainage <br /> <br /> The local storm drainage system consists mostly of underground pipes, and some <br /> natural swales in hilly areas, which carry water runoff from all points within the <br /> drainage basin to the flood control channels known locally as arroyos. New <br /> development is required to install adequately sized storm drains on site which <br /> connect to a network of drains under City streets. Most projects within the City <br /> have been required to size their storm drains to accommodate major rainfalls. <br /> The area along Kottinger Drive near the Kottinger Place Senior Center is one of <br /> the few examples of an older, undersized storm drain. <br /> <br /> In the future, installation of appropriately sized sWrm drains will continue to be <br /> required of new developments and adequately sized to accommodate buildout of <br /> the Planning Area. Improvements to the older portions of the storm drain <br /> network are scheduled to be completed in periodic increments, as needed, and <br /> budgeted in the City's Capital Improvement Program. <br /> <br /> d. Flood Control <br /> <br /> The responsibility for flood control within the Planning Area lies with the <br /> Alameda County Flood Control and Water Conservation District, known locally <br /> as Zone 7. Its responsibilities with regard to flood control include improving and <br /> maintaining existing flood control channels and the installation of new drainage <br /> channels. Most of these channels, the arroyos, have been improved over the past <br /> 20 years in conjunction with new development projects. The Arroyo de la <br /> Laguna, south of Bernal Avenue, has not been channelized and supports a distinct <br /> riparian corridor. Improvements to this area should be designed to retain riparian <br /> flora and fauna to the maximum extent possible. <br /> <br /> 7 <br /> <br /> <br />