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li E Water Resources: The EIR analyzed the project's potential impacts on surface water - specifically, the three significant ephemeral creeks traversing the property and the project's potential impacts to groundwater reserves due to pumping for process water. II�' Surface Water: Three significant ephemeral creeks traverse the property, each of which is a tributary to Bear Creek. These creeks typically flow during the winter and spring only and are dry during the rest of the year. Two of the ephemeral creeks drain the northeastern portion of the site. The third creek, located in the western portion of the site and exiting the property at the northwestern corner, drains the remainingportions of the site. Of these three drainages, only the third (discharging to the northwest corner) drains portions of the site concurrently in use for excavations. This stream also drains the adjacent Darwin Farms,,i as well as i portions of the area currently used by Darwin Farms for fowl waste drying operations. Historic dredging for gold occurred in this stream northwest of the subject site, as evidenced by the remaining dredge tailings. Each of these three ephemeral streams supports a noticeable variation in flora compared to surrounding areas. Along these creeks can be found the highest concentrations of Blue Oak trees on the property. KRC is not proposing any excavation activities along these creeks. Approximately eight smaller ephemeral drainages are located within the upland plateau areas proposed for excavation. The project has been designed to retain runoff from excavated areas on the site within the working pit. Ultimately, all disturbed areas will be reclaimed and revegetated, which will minimize soil erosion and the resulting sedimentation of surface water. The application also proposes to avoid the three significant ephemeral drainage courses on the site. P Operations will be subject to the Tentative Waste Discharge Requirements adopted by the Regional Water Quality Control Board on October 28, 1994, which prohibits discharge of waste to surface waters or surface drainage water courses. I Ground Water: i The aggregate plant uses approximately three million gallons of water per day. Except for what is lost from evaporation, this process water is recycled. Process water is made up of storm water collected in the process ponds during the rainy season and ground water pumped from the production well. During the summer months,when evaporation rates are high, process water is augmented by the production well. Typical summer supplemental water requirements are 10 percent of the total process needs,or 300,000 gallons per day. During the summer of 1994, supplemental pumping occurred for approximately two weeks. I The EIR contained an evaluation,which included computer modeling,of sustained ground water pumping over the next 25 years was prepared to determine what effects, if any, KRC's ground water pumping might have on neighbors' wells. The evaluation concluded that continued ground water production over the life of the project would have minimal impact on ground water storage and on adjacent area wells. 'h Traffic: Existing access to the site is off of Brandt Road via a one-half mile gravel road. No changes are proposed as part of this application. The proposed quarry expansion is not expected to generate increased traffic. ,F San Joaquin County QX-94-2JKRC,�Aggregate Community Development f Page 9 I