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SUMMIT ErvGINEERING, INC. Consulting Civil Engineers 3 u ly 23, 2001 Project No. 2001015 Page B.2 A discussion of each of these features is provided below (refer to the Process Wastewater Management System Schematic in Enclosure A). 1. Initial screening -- Provided by screened baskets and strainers installed on the trench drains and floor drains within the Receiving Area. Screen opening sizes are and will be on the order of 1/4 inch for exterior drains and 1/8 inch for interior drains. 2. Gravity collection system -- Designed to provide low maintenance and no infiltration or exfiltration. Piping is compatible with process wastewaters and satisfies Uniform Plumbing Code and local requirements. 3. PW pump stations --The duplex pump stations will be capable of pumping all of the anticipated process wastewater flow ranges (see Pond Sizing section for projected process wastewater flows) with one duty and one standby pump that can alternate functions at each sump location. The +' duty pump would be used for all but the most extreme PW flow conditions. The second (standby) pump would be activated during peak hour events or similar events of infrequent occurrence and short duration. Storage in the pump sump would provide some additional factor of safety. New PVC forte mains to the ponds will be sized to be adequate for the peak flowrates anticipated from the pump stations. 4. Pretreatment—Consisting of the following elements: a) pH control system (if necessary) i) Summit's experience over the last 10 years has indicated that pH neutralization of winery PW is typically not required. The combination of naturally occurring alkalinity in the source water and the alkaline cleaning compounds used within the winery usually provides sufficient buffering to maintain pond pH above 6.5. It is also preferable not to add neutralizing chemicals to the PW unless it proves absolutely necessary to do so be because these chemicals are eventually applied to the land when PW is used for irrigation. For the above reasons, Summit does not recommend the installation of pH control systems when the PW Management System is first constructed. Instead, M Summit recommends that the pH of the ponds be monitored for a year E (monitoring is required by the RWQCB), especially through one harvest season. At the end of the one-year monitoring period it has been demonstrated that pH control is necessary (or sooner if conditions warrant), a pH control system could be added. A description of this system is presented below. ii) Capability for addition of an automatic pH control system (if necessary) in the future, to adjust pH of the wastewater (as required) to above 6.5. This future system (if provided) will consist of a pH sensor, controller/recorder, control piping manifold, sparger and chemical storage. A pH probe will be available for monitoring. Anhydrous ammonia that will be used as the neutralizing chemical, will be introduced in the pumping station wetwell.