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4.6 WATER RESOURCES To characterize the groundwater quality near the project site, two water samples from the northern well were analyzed for nitrates and DBCP (see Appendix E). Nitrate was analyzed both as nitrate-nitrogen (N) and as nitrate (NO,). The drinking water standards (Title 22, California Administrative Code) for N and NO,are 10 milligrams per liter(mg/1)and 45 mg/l, respectively. The analytical results of the two groundwater samples from the site both showed nitrate-nitrogen(as N) concentrations of 0.3 mg/l, well below the drinking water standards. The nitrate (as NO,) concentrations for the two samples were 1.4 and 1.3 mg/1. DBCP was not detected in either of the two groundwater samples from the northern well. The detection limits for the DBCP analysis was 0.2 micrograms per liter (ug/1). Erosion Erosion of topsoil is a continually occurring process. Erosion produces suspended sediment in the runoff water which can adversely affect water quality in streams and lakes. Because of the gentle slopes and low level of site disturbance,there is no evidence of significant existing erosion problems on the project site. ENVIRONMENTAL IMPACTS AND MITIGATION MEASURES Significance Criteria According to CEQA Guidelines, implementation of the proposed plan would have a significant adverse impact if the project would result in substantial degradation of surface or groundwater resources compared to prevailing standards, or if it would cause or increase the potential for substantial flooding, erosion or siltation. Short-term impacts would potentially result from construction period activities; long- term impacts would potentially result from the alteration and operation of the lakes, operation of the golf course and other developed uses in the study area. Water Supply Needs Domestic Water Supply Twenty-six individual residences plus a golf course, clubhouse and related recreation facilities will require a supply for drinking water, landscape irrigation and ancillary domestic needs. This is proposed to be supplied by individual water wells serving each building site. The estimated water demand per residence is about 850 gpd, or about 0.95 acre-feet per year. Including the recreational facilities (estimated at 1,200gpd,excluding the golf course),the estimated total annual domestic water supply need is 26 acre-feet. A permit may be required if any residences or the clubhouse facilities are served by a public water system. Such a system serving multiple residences or common facilities would come under the regulatory jurisdiction of the San Joaquin County Public Health Services. 4.6-8