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Mr. Dave Nettles <br />May 23, 2006 <br />Page 3 <br />(-45 inches per year). This atlas indicated that the average percentage of the total yearly <br />evaporation for the month of April was 9 percent and for the month of May was 12 percent. Since <br />the 30-day period only accounts for 20 days in April and 9 days in May, these percentages become <br />6 percent and 3.5 percent, respectively. Applying these values to the total water surface areas for <br />each month, gives a total 30-day evaporation of 331,099 gallons. <br />30-DAYINTERIM TEST RESULTS <br />Thirty days of the total allowable 90-day leakage for the Brannan Pit South Cell to meet the design <br />standard is 2,414,880 gallons. The pump discharge value measured at the site 30 days into the test <br />is 2,000,500 gallons or 82.8 percent of the allowable. <br />The mass balance calculation for the south cell pit takes into account the loss of water in the pit <br />from pumping effects, evaporation of surface waters, plus the inflow of water into the pit from <br />precipitation. Therefore, the mass balance volume equation becomes: <br />Vtotal = Vpump + Vevap - Vprecip <br />Vtatal = 2,000,500 gal + 331,099 gal - 89,447 gal = 2,242,152 gals = 2.24 MG <br />As indicated in the above calculations, the total unregulated inflow during the 30-day period is <br />approximately 2.24 million gallons (MG) (51.8 gpm). This value is 172,728 gallons less than the <br />SEO design limit for the 30-day period. <br />To date, the leakage testing and water balance analysis at the site indicates that the unregulated <br />groundwater inflow to the empty pit does not exceed the calculated design standard defined by the <br />State Engineer's guidelines. <br />If you have any questions or comments regarding this ongoing project leakage test, please call. <br />DEERE & AULT CONSULTANTS, INC. <br />Colby J. Hayden, P.E. <br />Principal, Project Manager <br />Attachments <br />cc: Bob Lembke, United Water and Sanitation District <br />Drew Damiano, United Water and Sanitation District <br />PA0178 The Bromley CompanylBn=. Pit 29kLiner Leak Test Water Balance DatagL kage Test Statm.doc