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WASTE DISCHARGE REQUMENTS ORDER NO. -2- GEORGE REED,.INC. AND 711 MATERIALS, INC. AGGREGATE MINE AND WASTEWATER SYSTEM SAN JOAQUIN COUNTY 10. Approximately 500,000 tons of aggregate is produced annually. Present and anticipated activities are expected to produce approximately 500,000 tons of aggregate. Processing at the facility occurs for approximately 180 days per year. 11. The aggregate wash equipment, stockpiling,and settling ponds are-l'ocated"ori the north' ` side of the Mokelumne River. Excavation of earth materials is performed on the south side of the river. The facility consists of the following parcel numbers: Parcel Name Parcel Number Property Use Location Featherstone Ranch 021-130-11 Processing/Pond North of River Featherstone Ranch 021-130-05 Processing/Pond North of River Featherstone Ranch 021-130-02 Processing/Pond North of River Solari Ranch 019-220-27 Excavation South of River Merritt Ranch 019-220-14 Excavation South of River Solari Ranch 019-220-28 Excavation South of River 12. The processing facility and surrounding quarry areas have been developed in phases. Presently, the western half of Section 15, T4N, RSE is being excavated. George Reed, Inc. estimates the excavation will continue on the present phase for approximately 10 years. George Reed, Inc. has an option to buy additional property contiguous to the active site. BACKGROUND 13. In the 1930's, a gold dredge operated on the Mokelumne River from the Lake Camanche area to the George Reed, Inc. property. The dredge inverted the sediment stratigraphy, placing cobble and gravel sized material on the surface and the topsoil below the coarse grained materials. The cobble and gravel sized material was subsequently excavated by the Claude C. Wood Company. Remaining topsoil was removed at an unknown time for sale. Coarse-grained materials that remained were subsequently excavated by the Claude C. Wood Company. 14. George Reed, Inc. purchased the facility from the Claude C. Wood Company in about June 1993 and it has operated consistently since then. 15. Because of the history of gold mining at the facility, wastewater samples were collected and chemically analyzed for mercury. Samples were also collected from the Mokelumne River upstream and downstream of the quarry. The mercury concentrations fall within background concentrations and are not considered significant. The results are presented below. Sample Name Date Result Sample Location M309533 9/27101 4.8 ng/l Main Silt Pond Discharge, M309534 9/27/01 3.1 ng/1 Main Recycle Pond M309535 9/27/01 1.4 ng/l Mokelumne River Upstream M309536 9/27/01 1.2 ng/1 Mokelumne River Downstream