Agenda - 05-26-2015 - C-2 - Laserfiche WebLink

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185 considered. These things will need to be more fully considered as the plans develop for the potential future of this site. It is likely that additional soil evaluations will be required once lot layouts are considered and developed for this property so that septic system types and the location of a septic drainfield can be more fully and appropriately considered. Two areas (see map in Attachment 3) exhibited soil characteristics and soil depths (24" or greater) that are provisionally suitable for conventional or shallow conventional trench septic systems. These areas are approximately 1,687,249ft2 and 32,147ft2, respectively. Typical profile descriptions of the provisionally suitable soil for this property are in Attachment 4. Two distinct soil profiles were observed in the soil borings on the property: a deep red clay subsoil or a shallower red clay subsoil. The provisionally suitable soil borings had the following characteristics. No restrictive horizons were found in any provisionally soil borings within 36" of the soil surface. Soil texture was provisionally suitable and was estimated to be silt loam to sandy loam near the soil surface (A horizons) and clay in the subsoil (B horizons). Soil structure was provisionally suitable and was estimated to be granular near the soil surface (A horizons) and subangular blocky in the subsoil (B horizons). Clay mineralogy was provisionally suitable with very friable to firm moist soil consistence and non - sticky to sticky and non - plastic to plastic wet soil consistence. Indications of saprolite were detected in some soil borings, but were not dominant in profiles. The major soil types on this property are Appling sandy loam (map symbol APB), Cecil fine sandy loam (map symbols CfB and CfQ, Chewacla loam (map symbol Ch), Enon loam (map symbol EnB), Georgeville silt loam (map symbols GeB and GeQ, and Herndon silt loam (map symbols HrB and HrQ. The Orange County Soil Survey indicates that moderate ( Appling, Cecil, Georgeville, and Herndon) to severe (Chewacla and Enon) limitations exist for septic systems installed in these soils types (Attachment 5). The land area required for a conventional or shallow conventional septic system is calculated based on the size of the proposed home and the Long -Term Acceptance Rate (LTAR) of the soil. The LTAR range for the provisionally suitable soils on this property is 0.1 — 0.4 GPD /ft2 based on the most restrictive soil texture in the subsoil. Table 1 below presents estimated conventional or shallow conventional septic system land area requirements for several home sizes and LTAR's on this property. The LTAR suggested by AWT for a majority of the provisionally suitable soil is 0.25 GPD /ft2, but the final LTAR for specific septic system types and septic drainfield locations will be set by the Orange County Health Department. The detailed computations are in Attachment 6. 2