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Marion County <br /> --1 ;��_:• OREGON <br /> PUBLIC WORKS <br /> April 23, 2021 <br /> (503)588-5036 <br /> Sara Masser <br /> 9308 Silver Falls Hwy <br /> BOARD OF Aumsville, OR 97325 <br /> COMMISSIONERS <br /> Kevin Cameron, Chair RE: Proposed major repair permit no. 555-20-008588 <br /> Danielle Bethel) 9308 Silver Falls Hwy SE, Aumsville Oregon <br /> color Willis <br /> DIRECTOR Dear Ms. Masser <br /> Brian Nicholas, P.E. <br /> We have completed our site evaluation for the proposed major repair at the <br /> ADMINISTRATION above referenced property, please see the findings below: <br /> BUILDING Approved Area & System Type <br /> INSPECTION <br /> A soils test pit and other site features were evaluated on the property during the <br /> EMERGENCY site visit on April 12, 2021 Conditions observed during this site evaluation <br /> ' MANAGEMENT indicate that the area around the evaluated test holes are not capable of <br /> supporting a Standard septic system, due to the following limitations: <br /> ENGINEERING <br /> Limited space — There is not sufficient area for a full standard system in <br /> ENVIRONMENTAL accordance with OAR 340-071-0220. <br /> SERVICES <br /> Permanent groundwater level is too close to the ground surface: <br /> OPERATIONS DEQ Rule requirement: Permanent groundwater level cannot come within <br /> 48" from the bottom of an absorption facility for a Standard or capping fill <br /> PARKS system or within 24" from the bottom of an absorption facility for an <br /> Alternative Treatment Technology system. "Permanent groundwater" refers <br /> PLANNING to a water table that exists year-round. OAR 340-071-0100(101) <br /> Description: Treatment of sewage occurs in the soils around the drainfield <br /> SURVEY area. If groundwater comes in contact with the sewage before it has been <br /> adequately treated in the soils, there are two concerns: 1) very little <br /> treatment occurs in saturated soils —the presence of air is required for good <br /> treatment; and 2) sewage may be "forced" to the surface where it poses a <br /> potential public health hazard. Evidence of a permanent water table was <br /> found at 12 inches in the test pit. <br /> Under the conditions observed at the above address, an Alternative Treatment <br /> Technology (ATT) Treatment Standard 2 system with a Gravelless <br /> Absorption Drainfield is required by DEQ rules. <br /> Specific Requirements <br /> Specific sizing and site placement details can be found on the attached Soil <br /> Notes/Field Worksheet. A field stakeout of all system components is required <br /> as a condition of this site approval to verify adequate area exists. <br /> 5155 Silverton Road NE•Salem,OR 97305-3802• www.co.marion.or.us/PW <br /> Printed on recycled paper• Reduce—Reuse—Recycle-Recover <br />