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MAR. -X 95ITHUI 16: 19 NOLTE & ASSOC, SACTO TEL:916 641 92?2 P 013 <br /> Mr, rim Hamrick <br /> July 14, 1994 <br /> Page 17 <br /> fills to capacity, an overflow pipe conveys wastewater to Pond 2 and then to Pond 3 as Pond <br /> 2 fills to capacity. The inlet and outlet elevations of all the overflow pipes are set at <br /> elevation 136'-3", while the bottom of the three wastewater evaporation ponds are <br /> approximately at elevation 128'-7". Free board for the evaporation ponds varies from <br /> approximately 3'-9" for Pond 1 to approximately 2'-3" for Pond 2 and 1'-4" for Pond I <br /> Perm"bility <br /> Based on the Soil Conservation Service (SGS) soil survey, the clean water soil permeability of <br /> the soil around the Owens-Brockway facility varies from 0,06 to 0.6 inch/hour. Based on <br /> actual data (wastewater flow, precipitation data, evaporation data and remaining pond <br /> - capacity), the clean water soil permeability was calculated and approaches the higher limit <br /> from the Soil Conservation Service (SCS) soil survey. <br /> Soil infiltration tests typically overestimate the actual saturated condition infiltration rate. <br /> Due to this overestimation, the clean water soil permeability is usually reduced by multiplying <br /> the clean water soil permeability by a hydraulic loading safety factor. The hydraulic loading <br /> safety factor is usually between 2% to 15% depending on the infiltration test used. <br /> Since the wastewater evaporation ponds have been operating satisfactory to date, the clean <br /> water soil permeability was calculated to be 0.46 inch/hour. A hydraulic loading safety <br /> factor of 7% was selected based on a conservative range for variable field data or site <br /> conditions. <br /> Eyaporration Rates <br /> Evaporation Tabes for the area around the Owens-Brockway facility were determined from <br /> evaporation station number B90 899600 from the Department of Water Resources <br /> 'Evaporation from Water Surfaces in California" bulletin. <br /> Precipitation Ram <br /> Precipitation rates for the area around the Owens-Brockway facility were determined from the <br /> Tracy Carbona precipitation station number B90 8999 from the Department of Water <br /> _ Resources "California Rainfall Summary Monthly Total Precipitation 1849- 1980, July 1981" <br /> bulletin. Precipitation rates for a one-hundred year storm event were used_ <br /> ISO& <br /> wOliE.w1 M}fipRr}E �, <br />