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INITIAL STUDY FOR TRACT NO. 1742 DISCUSSION OF ENVIRONMENTAL IMPACTS : 1 . a. Jahant Slough and its banks are within the 100-year flood zone . The rest of the property is largely Zone C . 1 . b. , c . , & d. There could be significant effects from the release of drainage water into Jahant Slough. The water may contain pollutants from roads and driveways. Increased flows could lead to siltation and the potential for flooding downstream. Additional information regarding the suita- bility of using Jahant Slough for terminal drainage should be obtained. 2 . b. Grading activities during subdivision construction could lead to erosion and siltation of Jahant Slough. To pro- tect the watercourse, an open space buffer could be pro- vided along Jahant Slough. 2 . c . This project would not result in a conversion of prime farm land. The soil classifications on the project site are Class III or IV, both nonprime soils. The project site has been designated as Rural Residential on the General Plan Map. 3 . a. The Department of Fish and Game has indicated that the wildlife habitat on the project site is "composed of annual grassland pastures bisected by Jahant Slough. Mature valley oak trees line both banks of Jahant Slough, and there are several scattered valley oaks in the pasture areas. Jahant Slough possesses significant wetland habi- tat as well . " A suggested mitigation measure would be to make sure all viable valley oaks are preserved and pro- tected. In addition, a buffer zone should be created along Jahant Slough to protect the riparian habitat . 3 . b. The State Department of Fish and Game has indicated that the project site contains suitable habitat for two State- listed threatened species. They are Swainson' s hawk and the giant garter snake. As stated in 3 .a. , it would be recommended that a buffer zone be -created along Jahant Slough to protect the riparian habitat and the endangered species listed above. 4 . There may be some deterioration of existing air quality due to an increase in vehicle emissions (estimated 740 vehicle trips per day, based upon 10 trips per day per dwelling unit) . It is not anticipated that the impact would be at a significant level . Environmental Impacts - 1 - (Tract No. 1742 )