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The fact that the groundwater quality is excellent and that winery <br /> wastewater disposal has been practiced for many years (more than <br /> 15 years) is an indication that groundwater pollution from the land <br /> application practices is not occurring. <br /> Wastewater Flows <br /> There is no meter on either the supply well or the wastewater collec- <br /> tion system so the flows are estimated from the tank volume (for <br /> stillage flow) and the hose size and pressure (for washwater). The <br /> stillage flow is estimated at 20,000 gallons per day (gpd). Stillage <br /> production occurred on about 10 days in 1984 and may occur on about <br /> 20 days in 1985. <br /> The remaining wastewater consists of plant washwater which varies <br /> from about 10,000 gpd during most of the year to about 20,000 gpd <br /> during the crush (September and October). Waste cooling water is <br /> discharged directly to the Mokelumne River under NPDES Permit No. <br /> CA 0078069. <br /> Wastewater Quality <br /> The stillage wastewater quality has been analyzed and the results are <br /> shown in Table 2. Samples were taken in Novemer 1984 by the RWQCB <br /> staff and in May 1985 by both RWQCB and Turner Winery personnel. It <br /> should be noted that material to be distilled is either wine or <br /> centrifuged distilling material (d.m.). This explains the low <br /> suspended solids content. <br /> TABLE 2 <br /> STILLAGE WASTEWATER QUALITY, mg/L Except As Noted <br /> Constituent November 1984 May 1 May 1 (Turner) <br /> BOD 18,000 15,000 10,900 <br /> COD -- 18,000 12,800 <br /> Total Kjeldahl <br /> NitrategRytrogen 2 �9 3700 6255 <br /> pH 9.8 3.8 3.9 <br /> Suspended Solids 260 130 130 <br /> NOTE: aReported value of 40 mg/L is unrealistically high. <br /> 2 <br /> GEORGE S NOLTE AND ASSOCIATES <br /> Crvrt•bP ENVMt)N4f N1 Al fNtiNf1.5 Vt Nhf R4 $1 Nvf v().5 <br />