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M . -3- - day or less) associated with these facilities. Also, only domestic wastewater is allowed under the general WDRs so that the threat from exotic chemicals or more toxic constituents is non-existent. Based upon the information contained in the Environmental Checklist and this document, the SWRCB finds that the discharge of waste from small domestic systems will not result in a significant effect on the environment, provided that the discharger complies with the terms of this Order. The basis for this conclusion is set forth more fully below. IV. Reasons for Modified Environmental Checklist The sections not included in the attached Environmental Checklist are Population and Housing, Transportation/Circulation, Energy and Mineral Resources, Noise, Public Services, and Cultural Resources. The potential impacts of new domestic systems on these subjects depends upon site-specific considerations, which are unknown at this time. Any discussion by the SWRCB on these topics would, therefore, be speculative and conceptual V. Discussion of Environmental Evaluation The discussion below is keyed to the CEQA Environmental Checklist (attached). 3.h. Impacts to Ground Water Quality The discharge of small volumes of domestic wastewater to land for disposal by leach field, ponding, or other appropriate disposal method could have a limited impact on ground water in the area surrounding the disposal activity. Domestic wastewater usually contains nitrates and salts. Subsurface, spray irrigation, and percolation pond disposal are the disposal methods most likely to affect water quality in the ground water. Under inappropriate conditions, each of these disposal methods has the potential to pass nitrate and salt to the ground water. The proposed general WDRs though will mitigate this potential impact because the discharger will be required to comply with the following provisions: A.2. The treatment and disposal of wastes at the facility shall not cause pollution, contamination, or nuisance as defined in CWC Section 13050. A.7. Discharge of waste classified as "hazardous" or "designated",as defined in CCR, Title 23, Chapter 15, Section 2521(a) and . Section 2522 (a), [...J, to any part of the wastewater disposal system is prohibited.