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Septic Site Evaluation 555-19-003132-EVAL Page 3 of 4 a „ a3"o E -tRR z �r` '4,. �M r9' '.. �, s ""'r �'� •Ati3 A a'ra*�iw- R' " rfir.+ 4 ,�.,��1 ' .� - �, ar v.+ .. rz o3 z sr uw :,. x a yr .p �p��/y�h�[�� m�rtp'ata S �E sh hrahf�/O § sj�sjr�h �` ,� h.�.ra� £`-��a'��,�'�`` "�v �.yt r' � 4 a R i itir00 R14ifiI S Vlt`PES.. Li7� 4'�3,:1W _ `,�.g _`. �. e' ,. 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: .00000000 Soil types-how well they drain and other indicators of good soil structure for treatment •00000000 Depth to evidence of groundwater .00000000 Wells located on the site or adjacent sites .00000000 Slopes,escarpments,ground surface variations,topography .00000000 Creeks or springs on the site or adjacent properties .00000000 Whether the soils have been disturbed .00000000 Setbacks from property lines,buildings,water lines,and other utilities .00000000 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 the site visit on May 7,2019.The conditions observed during this site evaluation indicate that the area around the evaluated test pits IS NOT CAPABLE of supporting a Standard septic system due to the following limitation(s): Temporary groundwater level is too close to the ground surface DEQ Rule requirement: Temporary groundwater level cannot come within 24"of ground surface for a Standard system,within 18"for an Alternative system with a Standard equal distribution drainfield,and within 12"for an Alternative system(on a slope of 12%or less with a Capping Fill drainfield). "Temporary groundwater"refers to a water table that completely dries up during certain times of the year.OAR 340-071-0220(1)(b)(B) Description: Treatment of sewage occurs in the soils around the drainfield area. If groundwater comes in contact with the sewage before it has been adequately treated in the soils,there are two concerns: 1)very little treatment occurs in saturated soils—the presence of air is required for good treatment;and 2)sewage may be"forced"to the surface where it poses a potential public health hazard. All three pits had evidence of a seasonal water table around 17 inches below the surface. Site/soil adversely modified DEC!Rule requirement: The site has not been filled or the soil has not been modified in a way that would adversely affect the functioning of the system. OAR 340-071-0220(1)(f) Description: Soils provide an important part of the treatment and"sanitizing"process for sewage. However,this treatment by the soils requires good structure. The problems caused by fill material: poor treatment of the sewage due to discontinuity of soil texture in layers. Sewage can flow through loose soils and potentially surface,causing a public health hazard. The site showed evidence of excessive modification around the observed test pits. Under the conditions observed in the vicinity of the test pits,an ALTERNATIVE TREATMENT SYSTEM with a CAPPING FILL DRAINFIELD is required by DEQ rules for both the INITIAL and FUTURE REPAIR systems. At your site ALTERNATIVE TREATMENT TECHNOLOGY Treatment Standard 1 will meet DEQ rules. Please refer to the signed approved site plan dated May 8,2019. Alternative Treatment systems include Sand Filters,Recirculating Gravel Filters and Alternative Treatment Technologies(ATTS). Alternative systems are installed where soil,drainage,water table levels or space limitations do not allow for a Standard system installation. The unit pre-treats the septic tank effluent before it is discharged into the ground. The owner of a Sand Filter,RGF or ATT system must maintain a service contract with a licensed and certified professional to service and maintain the onsite system. A service contract must be entered into before the system is installed and must be maintained until the system is decommissioned. Specific Requirements 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.) 5/9/19:2:32:45PM Page 3 of 4 ONS OnsiteEvaluation_pr