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FrH rom the attached well log for the adjacent well, a clay layer exists from 30 ft to 54 ft below <br /> Therefore, since the water table.is at 8.5 ft, and using 30 ft as the boundary, H= 21.5 ft. <br /> term maximum rise is estimated at 2 ft. Therefore,h=21.5 + 2=2 = 23_ <br /> _ .L A) (4 )Zm " <br /> �_l <br /> Kh ! lSyl <br /> where: Q= average daily flow in W/day <br /> A= area of disposal field in ft' <br /> C =mounding equation constant <br /> L=length of disposal field in ft <br /> K=horizontal permeability of soil in ft/day <br /> n=mounding equation exponent <br /> Sy= specific yield of receiving-soil in percent <br /> t =time since the beginning of wastewater application in days <br /> Substituting known constants for the variables: <br /> 3 g - <br /> Q = 360 gpd(From Max.flow volume calcs.,Page)- 7.48 gals/ft3 =48 ft3/day <br /> A = 12,000 ft2(From max. Sewage Standards sizing talcs) <br /> C =Length to width ratio = 1, therefore, C = 3.4179 <br /> 100 ft <br /> K=Using vertical permeability as most conservative= 3.9 min/in= 1440 min/day-3.9 = 31 ft/day <br /> ' h=23 (See above) f <br /> n=Length to width ratio 1, therefore,-n= 1.7193 <br /> Sy=27% <br /> t = 3,650 days (10 yrs)..- <br /> m <br /> - =0.1025 x 253.2 x 0.003526 x 1.99 =0.18 ft <br /> It appears that the maximum mound height thatmayoccur under.each of the disposal areas,and 41. <br /> above the current static water table depth is 0.18 feet. This would have an insignificant_impact on <br /> the distance between the soil/effluent interface and the trp.Tf the mound soil/effluent interface <br /> V z_42 inches below grade+ 5 ft se aration distance 8.5 ft.,The-mound may rise to the depth of 8.5 <br /> t - 0.18 ft 8.32 ft.) For wastewater treatment to occur, the distance effluent must travel under <br /> unsaturated conditions through the soil'environment-is generally regarded to be five feet. <br /> Wastewater treatment in this respect is taken to be destruction of bacteria and viruses. If it is <br /> determined at some point in the future that mounding effects are preventing proper effluent <br /> treatment and disposal, the area designated as the 50%replacement area may have to be activated. <br /> /SURFACE WATER INFORMATION <br /> As referenced on Page 2, there is an irrigation pond next to the southeast corner of the property. <br /> Stormwater retention ponds for the future homes will be on-site for each individual Parcel. There <br /> should be no impact to the septic disposal areas from impoundment water provided sufficient <br /> ' distance is maintained between them, as referenced in the Sewage Standards. <br /> Page -8- <br /> Chesney Consulting <br />