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r The construction of this project will ,create many impermeable surface areas and will eliminate the depressions and the man-made channel previously mentioned. As a result, a significant increase in the volume of runoff is anticipated. The City of Stockton Municipal Utilities Department (Appendix A-3) advises that the existing storm drains, pumps and other facilities are inadequate to handle even the existing development. They also note that the proposed development would necessitate the need for additional . terminal drainage and pumping facilities. The Department also advised that a drainage problem exists at the pump station located in the watershed to the north of the proposed project's watershed. To correct this existing condition, the pump in the northern watershed should be abandoned and a new pump station should be constructed and sized with capacity to pump both the project watershed and the watershed to the north. To determine the extent of the inadequacies of the existing drainage facilities in the adjacent area, the requirements of the proposed development, and the location and capacities of terminal facilities, a storm drainage study has been prepared as requested by the Municipal Utilities Department. The full report (Appendix f) is available for review at the Community Development Department/Planning Division, 6 East Lindsay, Stockton, CA. A reduced copy of the drainage study plan for the project area is included herein as an exhibit (page 22) . The boundary of the overall study area to determine the extent of the pumping facilities required is generally the Van Buskirk Golf Course on the south and west, State Highway 4 on the north, and Interstate Highway 5 and the PG&E power line on the east. It includes the project watershed and the watershed to the north. The watershed containing the project was studied in more detail to identify the pipe sizes and locations of the collector system within the project and the size of the trunk lines to be located in Eighth Street. The trunk lines will also serve approximately 297 acres of property in the watershed which is outside of the subdivision. The size of the trunk lines required to serve the project and adjacent watershed should be 48" and 54" and terminate at a new pumping station to be constructed on Lot A at the west end of Eighth Street. The pump structure should be designed to sufficient size to accommodate additional pumps which will be required for a 66" trunk line which will serve the northern watershed. MITIGATION: The project developer, in addition to all on-site facilities, should be responsible for all costs for the installation of facilities required by the development. If the facilities are over-sized to serve 21