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t • tnnedy/Jenks Consultants 1 Section 4: Reclaimed Water As described in the 30 July 2004 ROWD, Musco intends to treat the process wastewater generated at the Facility to reduce the organic and inorganic dissolved solids content to levels comparable to or better than the ambient groundwater quality underlying the areas of the offsite ' reclamation properties. The reclaimed water will be suitable for irrigation use. Section 6 of the ROWD (2004) describes the conceptual design for the proposed stream ' segregation and treatment approach. Treatment is most effectively accomplished through grouping the streams according to their relative inorganic content and focusing on treating several of the streams with higher inorganic content. Based on the available individual stream ' data, the composite of the streams targeted for treatment contains approximately 6,000 mg/I of inorganic dissolved solids. Other streams having lower concentrations of inorganic dissolved solids will be sent directly to the 84-MG reservoir following screening for solids removal as ' appropriate. The proposed treatment process involves the use of aerobic biological degradation, ultrafiltration (UF), and multi-stage reverse osmosis (RO). To minimize fouling of the RO ' membranes, organic constituents in the process wastewater streams designated for treatment are reduced via aerobic biodegradation and physical straining in an immersed membrane bioreactor(MBR). The effluent from the MBR unit is expected to contain less than 10 mg/I of ' BOD. Permeate from the MBR would be pumped through a two-stage RO system for separation of dissolved inorganic ions. The RO reject stream, which will contain the majority of the dissolved inorganic solids, will be directed to the existing Class II surface impoundments for ' disposal. The combined RO permeate will be sent to the 84-MG reservoir, blended and stored with the other non-treated streams prior to irrigation. Figure 4 illustrates the process flow diagram of the proposed segregation and treatment strategy, which is presented in Section 6 of ' the 30 July 2004 ROWD. Flow from the streams designated for treatment should be equalized to provide a uniform feed water quality for successful operation of the MBR. Equalization will be based on the discharge patterns from the various unit operations at the facility; the aboveground tankage associated with the MBR may prove sufficient for equalization. The OF membrane cassettes and RO systems must be adequately sized to accommodate estimated design peak flows. During the fall ' harvest period, process wastewater production increases due to additional olive processing. The peak flow rate of the streams assumed in the conceptual treatment design is approximately 240,000 gpd. ' A current constraint in the design of the treatment process is the volume of the RO reject streams, which will be sent to Musco's Class II surface impoundments. The surface impoundments have an average-year evaporative capacity of approximately 10 million gallons, ' which translates to 30,000 gpd assuming 330 days of facility operation annually. This establishes the desired minimum overall water recovery of the RO system at 87.5%. In order to simultaneously achieve the desired inorganics removal and meet this hydraulic recovery constraint, the conceptual design includes treatment of reject from the first brackish RO unit through a second seawater RO unit, which is manufactured with smaller pores to achieve a higher degree of separation. Reclamation Report, Page 11 ' Musco Family Olive Company 9 Vs9�uFadrrinGob1021020104.00_muuoofr.?IC9rexrts4eCxmaCan ryfunu�so reUari.-+ion rwoR4x18.1104.dm