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Marion County OREGON COMMUNITY DEVELOPMENT DEPARTMENT JAMES B. BURBY, FACILITIES ENGINEER C/O WILLAMETTE NATIONAL FORe'ST P.O. BOX ~0607 EUGENE~ OREGON 97440 SUBJ: SITE EVALUATION FOR SUBSURFACE SEWAGE DISPOSAL UPPER ARM PICNIC PARK, DETROIT RANGER DISTRICT I visited this property 9/18/91 and COmpleted the evalua- tion for restroom facilities using subsurface sewage disposal at the Upper Arm Picnic Park, soil conditions appear suitable to consider the proposed site for stan- dard septic system drainfield installations if there is enough space to construct the drainfleld. The soil con- sists of a deep well drained gravelly loam over coarse sandy gravels.'With this type of soil 75 lineal feet of dratnfiel~ is normally required per 150 gallons of sewage flow with sewage strength similar to normal household wastewater. The sewage strength might vary considerably for the park restrooms, so to properly establish the appropriate system we should have actual waste strength data from a similar facility. I doubt that there is enough area to site the original and a complete backup (replacement) system using standard system construction within the site I reviewed, An alter- native might be the san~ filter system which requires somewhat less drainfield. A sand filter system designed to process over 600 gallons of daily sewage flow must be submitted to the Sta~e Department of Environmental Quali- ty for plan review. ~opefully, there is enough space to construct the original standard System. Please contact our office with any information you may have pertaining to effluent sewage strength at any simi- lar park facilities. If none is available, the D.E.Q. should be able to provide some guidance to establish a design factor. A field stakeout may be necessary to confirm the appropriate systems. Senator Building 220 High Street NE ' S,',lern, Oregon 97301-3670