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DISCUSSION OF ENVIRONMENTAL IMPACTS: WATER, FLOODING AND DRAINAGE: 1.a. , l.b. , l.c. , l.d. , 2 .b. Portions of the site are subject to flooding, and will therefore be subject to the County' s flood ordinance. This ordinance will require that the floor elevation of all residential construction be raised to one-foot above the flood elevation. Development of the site as proposed will also result in an increased amount of impervious surfaces (i.e. , roadways, driveways) which will decrease percolation and increase sheet flow runoff across the site. The applicants are proposing to enhance Tracy Lake (the terminal sink for Jahant Slough) and its associated seasonal marsh, with Tracy Lake being full on a year round basis. Three primary sources for lake water are proposed (in order of Preference) : 1. Watershed runoff from Jahant Slough; 2 . Pumped water from the Mokelumne River; and 3 . Pumped groundwater. It is unknown what impacts on downstream users the diversion of Mokelumne River water may have. It is also unknown what effects groundwater pumping may have upon existing residential and agricultural users in the area. San Joaquin County is also presently subject to groundwater overdrafting. The Mokelumne River runs through the southern portion of the site. There are also numerous drainage ditches and swales transection the property and, as stated previously, the applicants are proposing to maintain water in Tracy Lake year round. Disturbance of the site during the construction phase could lead to erosin and sedimentation of these water courses. The development as proposed will also permanently alter the existing drainage pattern. An 18-hole links-type golf course is being proposed. There are potential ground and surface water quality impacts associated with the use of fertilizers, herbicides and pesticides on the golf course. -1-