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I il. DESCRIPTION OF AREA WATER RESOURCES A. SURFACE WATER The local surface water source is Hospital Creek, a small intermittent stream that exits the Coast Range mountains and flows in a northeasterly direction. The mean annual flow of this creek is very low, with an estimated 60% to 80% of the flaw infiltrating to groundwater. Due to the limited and highly variable flow, this creek serves no useful w purpose as a surface water supply. Imported surface water is one of the water supply sources to the surrounding area and to the subject 501 acre property. A 329 acre portion of the subject property has a surface water allocation from the Del Puerto Water District (DPWD), which holds a water i service contract with the United States Department of the Interior, Bureau of Reclamation ~ (USBR). Currently, the DPWD has a three-year interim water service contract with # provision for subsequent long-term renewal contracts for successive periods, not to exceed twenty-five years. Under this contract, lands within the DPWD are eligible to receive 129,370 acre feet per year, which provides a unit water supply of 3.1 acre feet per acre. At this rate, the 329 acre portion would be entitled to 1,020 acre feet per year in a full water supply year. This amount could diminish to an estimated 25 percent of the full entitlement or 255 acre feet per year during periods of extreme drought. There are ,provisions within the existing water service contract to allow this water to be used for municipal and industrial (M&I) purposes, i.e., aggregate mining, upon approval of the USBR Contracting Officer (USBR, 1994). Changing the use from agricultural to M&I would also require approval by the DPWD Board of Directors. It can be anticipated that upon demonstration of the necessity to utilize the surface water supply for the mining activity and a showing that no significant adverse impacts would result, the change of use would be approved. STODDARD&ASSOCIATES Assessment of Water Supply impacts AUGUST 1995 �PAGE 2 } k PP Y P ;i f