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Mayflower Mill Water Balance Table <br />An estimated Mill water balance is provided in the following <br />table. Average daily fresh and recycle water usage was <br />calculated from Mill production records. Total discharge <br />effluent from Pond 4 (MF002) was determined from NPDES records. <br />Unrecorded variations in flow and density give some error to <br />these numbers. In general records after March 1990 are more <br />complete and thus data after this time more accurate. <br />The far right column in the table titled "Balance" is the <br />total estimated fresh water usage minus the estimated total <br />discharge. A negative balance number indicates more water was <br />discharged than fresh water used at the mill. A positive balance <br />would indicate a loss of water by some other means than effluent <br />discharge assuming pond volume stays the same. With this in <br />light, data after March 1990 shows some reasonable trends. <br />Spring 1990 and 1991 months show a negative balance number when <br />ice melt, precipitation, and run off contribute to excess <br />discharge. Late fall and winter months have a positive balance <br />number due to ice formation and subsequent pond level rise. <br />Summer months show a negative- balance number possibly relating to <br />evaporation and ground infiltration. <br />Using 1990 average numbers the following estimated Mill <br />water balance is provided for a 24 hour operating day (based on <br />22 operating days per month): <br />Total Mill Water Use 1.41 MG /24 hr operating day <br />Fresh Water use 1990 0.86 MG /24 hr operating day (61 %) <br />Recycle water use 1990 0.55 MG /24 hr operating day (39 %) <br />Discharge MF002 0.81 MG /24 hr operating day <br />Balance- Evaporation, etc. 0.05 MG /24 hr operating day <br />