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Development of the 62 acres site as proposed will result in the loss of approximately half of the site as forage for the hawk, and potentially more in the future if the ponds are expanded. In order to mitigate for the loss of Swainson' s hawk foraging grounds, it is likely that off site replacement habitat will be required, to the specifications of the Department of Fish and Game. There is also the possibility that a State endangered plant exists on site; the Delta Button Celery, which is indicated on the Natural Diversity Data Base. Air Ouality 4 .a. No information relative to potential odor problems has been submitted; the application does note that odors are not expected because the ponds will be used to percolate treated wastewater. The applicant ' s engineer has also stated that the ponds will accept tertiary-treated effluent containing no nitrogen, low B.O. D. , and that has been chlorinated. Environmental Health has stated that the ponds may give off an offensive or obnoxious odor during certain climatic conditions, nevertheless. Natural Resources 6.b. , 13 .b. Pursuant to the California Surface Mining and Reclamation Act of 1975 (SMARA) , the State Mines and Geology Board has designated the sand and gravel deposits that are of regional and statewide significance. The proposed project site is within an area designated as a Mineral Resource Zone (MRZ-2) , containing significant deposits of sand and gravel. The Extractive Resources portion of the Resources section in the County' s General Plan contains the following objective and policy pertinent to this proposal: objectives: 1 . To protect extractive resources from urban development or encroachment. Policies: 1. Mineral deposits of significant quantity, value, or quality, as identified by the State Division of Mines and Geology reports as MRZ-2 Mineral Resource Zones (see Figure VI-4) , shall remain in open space uses until extraction of resources, unless the immediate area has been committed to other uses. This project will not involve any resource extraction. Although the proposed ponds are planned to be permanent, no structures are proposed and it is conceivable that someday the ponds could be relocated and the resources on site could be mined. Thus, this is considered to be a less than significant impact.