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i FI' :illustrate changes in shallow and deep aquifers which would affect aggregate extraction. Prepared projections of water requirements as function of aggregate. mining rates. Conducting water quality sampling and interpretation to define pre- project conditions, to determine agricultural suitability of water for post-mining reclamation to agriculture, and to analyze potential impacts of wet- and dry-pit excavations on ground-water quality for domestic and other uses. ! In. San Joaquin Co., designed and implemented a ground-water level and quality Ft monitoring program; preparing quarterly and annual reports to the County in conformance with. the adopted program. In Yolo County, designed and implemented a field observation/test program to 'define infiltration rates in reclaimed dry-pit excavation;'the results are being used in designing one or more artificial recharge basins in reclaimed dry-pit excavations, F ultimately to be part of a ground-water recharge and recovery project by the local .water district. Developed a steady-state three-dimensional numerical model to conduct ground-water level and capture zone simulations for the purpose of Fi ',investigating impacts on ground water resulting from mining. F, In Nevada Co., developed empirical relationships between ground-water levels, - precipitation, and applied water (treated waste water effluent) adjacent to dry-pit mining; prepared a ground-water flow model of the basin to project potential dry mining depths under various hydrologic conditions and effluent loading rates on adjacent land. Ground-Water Quality Protection near Wet-Pit Mining Operations; Yolo County Aggregate Producers Association :This study evaluated the potential risk to ground-water quality resulting from wet-pit mining of sand and gravel aggregate in the lower Cache Creek Basin. The study F' identified chemical and biological constituents that could affect ground-water quality and exposure pathways or pathway combinations. Recommendations were developed to reduce risk through mitigation measures, including engineering controls, emergency response programs, wellhead protection, land use planning, and monitoring. A ground-water quality monitoring program was recommended to provide for the earliest detection ofg round-water contamination and for a flexible, phased approach to monitoring that could be applied consistently at each of five project I sites located within the Cache Creek Basin. A phased technically-based approach was of great significance to the mining sites since monitoring requirements were ultimately set forth in the Environmental Impact Report for Off-Channel Mining F Programs and imposed requirements for approximately 30 years (during mining) and another. 10 years (post mining). Technical considerations providing the basis F;y