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Resolution No. /099 <br /> : Page 58 <br /> �onclusion - Suspected and known .system failures have <br /> occurred in the northeast Stubbs Bay Area, causing possible <br /> ground and surface water contamination. Possible reasons <br /> for this failure are: 1) tight clay soils which restrict <br /> water movement creating high water tables and hence causing <br /> surface seepage and/or groundwater contamination; or <br /> 2) systems undersized for current usage, or 3) systems � <br /> located in high water table/flood plain areas , " <br /> b) The ASarina Property <br /> "The observed water table at the marina site was 18" in <br /> � summer of 1978. The property contains three soil types . <br /> all classified as severely restrictive for drainfields <br /> . under Orono code, due to high 'water tables . • The City is <br /> under no obligation to approve any new drainfields on . <br /> these soils . <br /> � Approximately half of the marina property is below the <br /> 100-year flood level, as are about half of the East Lake <br /> � Street houses. In addition, septic systems are prohibited <br /> . in all designated sheet flow areas of shallow flooding in <br /> which the remainder of the property is contained. � <br /> PCA WPC-40 recommended standards prohibit drainfield <br /> _ installation in areas subject to flooding or in flood plains ' <br /> . delineated by local ordinances adopted in compliance with <br /> � � State Flood Plai.n Regulations (Minn. Reg. NR85-93) or where <br /> regiona,l flood, plain information is available. " <br /> The Marina property is not suitable for a standard drainfield <br /> system ". . : due to high water table and possible flooding." <br /> "The site is marginal for a�` mound system and determination <br /> o� �iepth to seasonal water t'able becomes a judgment decision. " <br /> A mound system ". . . . could be a source of groundwater <br /> • � contamination during flood periods . " <br /> � � <br />