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Septic Site Evaluation 555-18-003435-EVAL Page 3 of 5
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<br /> General Description of Site Evaluations
<br /> Sewage contains disease-causing organisms and other pollutants that can cause adverse impacts to human health and the
<br /> —environment-An-onsite sewage disposal system musttreatand dispose of sewage in a way-thatwill not cause a public —health hazard, contaminate drinking water supplies, or pollute public waters.
<br /> Proper treatment in an onsite system begins with primary treatment in the septic tank. The septic tank separates the solid
<br /> particles in sewage from the liquid. The liquid that comes out of the septic tank is called effluent. The effluent may then be
<br /> dispersed in the soil for further treatment or discharged into a secondary treatment device such as a sand or gravel filter or
<br /> other alternative treatment unit prior to dispersal in the soil. For proper treatment,the effluent must slowly infiltrate into the
<br /> underlying soil. Dissolved wastes and bacteria in the effluent are trapped or adsorbed to soil particles or decomposed by
<br /> microorganisms. This process removes disease-causing organisms,organic matter, and most nutrients. Effluent that
<br /> comes to the ground surface(through poor soils or other problems with the system)can be a possible health hazard
<br /> because it may still contain some disease-causing organisms. Soil that drains too quickly may not give the effluent enough
<br /> treatment and may result in groundwater contamination.
<br /> The purpose of the evaluation is to locate suitable soils in an area that is large enough for both the initial drainfield area and
<br /> the replacement drainfield area. The criteria used for this site evaluation can be found in Oregon Administrative Rules
<br /> (OAR)340-071.
<br /> In the site inspection,the following features are evaluated:
<br /> Soil types-how well they drain and other indicators of good soil structure for treatment
<br /> • Depth to evidence of groundwater
<br /> • Wells located on the site or adjacent sites
<br /> • Slopes,escarpments,.-groundsurface.variations,_topography
<br /> • Creeks or springs on the site or adjacent properties
<br /> • Whether the soils have been disturbed
<br /> • Setbacks from property lines, buildings,water lines,and other utilities
<br /> • Other site features that could affect the placement of your onsite system
<br /> Approved Area&System Type
<br /> Soil test pits and other site features were evaluated during site visits on June 5,2018. The conditions observed during the
<br /> site evaluation were indicative of a permanent water table,but due to disturbance of the site and other conditions, winter
<br /> water monitoring was necessary to determine the depth of the seasonal and/or permanent groundwater table. After 6
<br /> months of monitoring,the test pits on the property indicate that the area around the evaluated is not capable of supporting a
<br /> Standard septic system due to the following limitations:
<br /> Permanent groundwater level is too close to the ground surface
<br /> DEQ Rule requirement: Permanent groundwater level cannot come within 4'of the bottom of the drainfield trench for a
<br /> Standard system or within 12", 18"or 24"inches of the bottom of the drainfield trenches(depending on soil texture)following
<br /> an Alternative system. "Permanent groundwater"refers to a water table that is present at some depth beneath the land
<br /> surface throughout the year. OAR 340-071-0220(1)(b)(A)
<br /> Description: Treatment of sewage occurs in the soils around the drainfield area. If groundwater comes in contact with the
<br /> sewage before it has been adequately treated in the soils,there are two concerns: 1)very little treatment occurs in
<br /> saturated soils—the presence of air is required for good treatment; and 2)sewage may enter the groundwater where it
<br /> poses a potential public health hazard. Evidence of a permanent water table was observed at around 30"in both test pits.
<br /> Under the rapidly draining soil conditions observed at the above address, an ALTERNATIVE TREATMENT TECHNOLOGY
<br /> SYSTEM TREATMENT STANDARD#2 with CAPPING FILL DRAINFIELD is required by DEQ rules for both the INITIAL
<br /> and the REPAIR systems. Please refer to the signed approved site plan dated April 30,2019. Please refer to the Winter
<br /> Water Report and Summary included with this application.
<br /> Alternative systems include BOTTOMLESS SAND FILTERS, RECIRCULATING GRAVEL FILTERS,and ALTERNATIVE
<br /> TREATMENT TECHNOLOGIES. Alternative systems are installed where soil,drainage,water table levels,or space
<br /> limitations do not allow for a standard system installation.The unit pre-treats the septic tank effluent before it is discharged
<br /> into the ground.
<br /> CALL BEFORE YOU DIG...ITS THE LAW
<br /> 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
<br /> copies of the rules by calling the center.(Note:The telephone number for the Oregon Utility Notification Center is 1-800-332-2344.)
<br /> 5/1/19:2:57:04PM Page 3 of 5 ONS_OnsiteEvaluation_pr
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