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rFILTBED DISPOSAL FIELD ER t is our understanding that the effluent must be pumped from the septic tank due to the orientation of the Toilet Building in relation to the disposal field. Consequently, a filter bed design is recommended. The filter bed allows for a lower unit volume of septic system effluent to be distributed over a larger area. This theoretically creates a triple environmental benefit: First there is greater soil surface area for the treatment of effluent; not only at the soil-effluent interface, but individual soil particles as well. Treatment includes the destruction of bacteria and viruses. Secondly, since the filter bed disposal field will be comparatively high in elevation, there is a greater potential for evapotranspiration during approximately eight months of favorable weather conditions. Evapotranspiration is the combination of evaporation of effluent from the soil surface and transpiration from plants. As referenced, it is recommended that shallow rooted lawn grass be planted in the filter bed area. Thirdly, the filter bed requires less area than a conventional leachfield with 100 ft leachlines, and can therefore be constructed in confined locations. This allows more area to be designated for trees, larger landscape plants, playgrounds, etc. Additionally, this designates more area for the required 100% septic system replacement area. The replacement area must be denoted on Site Plan. FILTER BED EXAMPLE FOR THE NEW RESTROOM: 2,000 gallon primary septic tank. Therefore, Base Tank Capacity = 2,000 gal: Base Tank Capacity (BTC)+Average Daily Flow(ADF)x Soil Factor(SF) = 2,000 gal BTC+(600 gals x(5 days/7 days)=429 gals ADF)=2,429 ADF x 0.20 SF=486 lineal ft of leachline FILTER BED =486 LFLL x 3 = 1,457 sq ft(38 ft x 38 ft square) Our report is based upon current scientific knowledge used to assess factors which are extremely variable and complex within the environment. Although there are several methods to design, size and predict impact from a septic system, San Joaquin County Environmental Health Division Sewage Standards have been employed for these purposes. Therefore, no guarantee or warranty concerning any aspect of this investigation or design, is expressed or implied. We appreciate the opportunity to provide this service for you. If there should be any questions regarding to the information contained within this report, please contact the undersigned. Respea illy submitted, £N�(PONy�Nr, \yR��.Eo� H�stit�`s.� VALLEY Ag RESEARCH ,� No- 04675 Expires: 7 3l oL Don Chesney Registered Environmental Assessor#467 TF of r i Civil Engineer Intern #XE96643 vo Page 3 of 4 �Ila!!ey�lg�esearcFi