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Septic Site Evaluation 555-19-003469-EVAL Page 3 of 5 ba� �l��1R��C1J r �NI a 6 y � , t � ;i v� " 1 dv ¢y b - l, z a �yWitileaftfm,i � r � - z; rpAppicattonestatuSItEValuaoA � � t , � ��v Workddescrrplion:SE:FUTURE 3 SDRM SF0 5 �. � � -.rte §,. M7 a A eft '�i- �k � , � �' � a•a=, �� _ ..a ... ...Vie. ,.t - �,..�.. �.a r._........ ......... .... ,,,.__.d ,...,_.., ..a.,.,...�, .. General Description of Site Evaluations Sewage contains disease-causing organisms and other pollutants that can cause adverse impacts to human health and the environment. An onsite sewage disposal system must treat and dispose of sewage in a way that will not cause a public health hazard, contaminate drinking water supplies, or pollute public waters. Proper treatment in an onsite system begins with primary treatment in the septic tank. The septic tank separates the solid particles in sewage from the liquid. The liquid that comes out of the septic tank is called effluent. The effluent may then be dispersed in the soil for further treatment or discharged into a secondary treatment device such as a sand or gravel filter or other alternative treatment unit prior to dispersal in the soil. For proper treatment,the effluent must slowly infiltrate into the underlying soil. Dissolved wastes and bacteria in the effluent are trapped or adsorbed to soil particles or decomposed by microorganisms. This process removes disease-causing organisms,organic matter, and most nutrients. Effluent that comes to the ground surface(through poor soils or other problems with the system)can be a possible health hazard because it may still contain some disease-causing organisms. Soil that drains too quickly may not give the effluent enough treatment and may result in groundwater contamination. The purpose of the evaluation is to locate suitable soils in an area that is large enough for both the initial drainfield area and the replacement drainfield area. The criteria used for this site evaluation can be found in Oregon Administrative Rules (OAR)340-071. In the site inspection,the following features are evaluated: • Soil types-how well they drain and other indicators of good soil structure for treatment • Depth to evidence of groundwater • Wells located on the site or adjacent sites • Slopes,escarpments,ground surface variations,topography • Creeks or springs on the site or adjacent properties • Whether the soils have been disturbed • Setbacks from property lines, buildings,water lines, and other utilities • Other site features that could affect the placement of your onsite system Approved Area System Type Soil test pits and other site features were evaluated during site visits on June 12,2019. The conditions observed during these site evaluations indicate that the area around the evaluated test pits IS CAPABLE of supporting a STANDARD SEPTIC SYSTEM for the INTITIAL and REPAIR. Please refer to the approved site plans dated June 17,2019. Specific Requirements Please refer to the Soil Notes/Site Evaluation Worksheet which shows the approved areas and other details of the site visit. DRY SOIL CONDITIONS ARE REQUIRED FOR INSTALLATION(March 1—October 31).The geographical area in which the property lies is considered a risk to installation during winter months. Soil moisture conditions generally preclude construction of the drainfield in the winter months. A CURTAIN DRAIN(GROUNDWATER INTERCEPTOR)IS REQUIRED as part of this system to divert groundwater from the drainfield. The curtain drain trench must be constructed a minimum 12 inches wide by 42 inches deep with 30 inches of clean gravel placed over a 4 inch perforated pipe(ASTM Specification F 405, D 2729 or F 810). Gravel must be placed a minimum of 2 inches under the pipe. The gravel must be covered with filter fabric. Outlet pipe must be rigid,smooth-wall, solid PVC pipe meeting or exceeding ASTM Standard D-3034. The outlet must be fitted with a flap gate or rodent guard. The curtain drain must be located at least 10 feet up slope from the disposal field and must discharge through a watertight non-perforated pipe beside or below the disposal field. A minimum separation of 10 feet is required from the septic tank if the tank is located up slope of the curtain drain and 5 feet if the tank is located down slope of the curtain drain. Additional Conditions of Site Approval 1. This site is approved for the type of disposal system described above. Peak sewage flow into the system is limited to a maximum of 450 gallons per day,with an average sewage flow of not more than 225 gallons per day. This is normally CALL BEFORE YOU DIG...ITS THE LAW ATTENTION:Oregon law requires you to follow rules adopted by the Oregon Utility Notification Center. Those rules are set forth by Oregon Administration Rules. You may obtain copies of the rules by calling the center.(Note:The telephone number for the Oregon Utility Notification Center is 1-800-332-2344.) 6/17/19:4:06:12PM Page 3 of 5 - ONS_OnsiteEvaluation_pr