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State of Oregon- DEPARTMENT OF ENVIRONMENTAL QUALITY INTEROFFICE MEMO To: Flle D.~'a, June 2:', 1978 Subi~SSO-Varlance Request Vincent V. Pavlicek, TL 735; 735-1; 735-2; Sec. 30; TqS; RIW; W,M., ~arlon County Soil and Landscape Conditions: The USDA Soll Conservation Service has mapped the parcel as ^ml:y Slit Loam. The parcel ls nearly level, with slopes ranging from 0 to 2 percent. Distinct mottles were present In the proposed dralnfleld area e[ I0 to 12 Inches below the ground surface. Exploration on the parcel revealed e very limited area where mottles w~re encountered a: Iq to 16 Inches below the ground surface. Harlon County monitored the depth tO water on the parcel last winter. On 12/30/77, they found perched water at 2" on the ~est lot; 2" on the middle lot; 3" on the east tot; and standing water in the low areas. On 2/22/78, parched water wa~ found at 4" on the west lot; 6" on the middle lot; and 12" on the east lot, PE.q. posed Subsurface Olsposal Hodl.~..!catlons: To compensate for the above-described soil and water condltlonsr the following dralnfleld design modifications were ~roposed: Prior to Installation of the dralnfleld, t8" of topsoil ~ould be placed over and extended 15 ft. from the Initial dralnfleld area. 600 lineal feet of disposal trench would be Installed 3q inches below the top of the The amount of u,saturated soil during the ~lnter to dispose and treat the septic effluent Is too Ilmlted to be effectively compen- sated for by the proposed modifications. For · drelnfleld to function properly~ It must be placed in an aerated profile. Thl~ Is to allow for aerobic decompositlon of the sewage and prevent snt- urated flow of combined sewage and groundwater, i find that the high perched ~ater table ~Ill (with the addition of the se~aga) cause saturation of the proposed disposal trenche~.