Laserfiche WebLink
L <br /> Memo <br /> November 18 , 1992 <br /> Page 2 <br /> As of today a replacement septic system has been completed which is <br /> classified as a conforming system which has been granted variances for <br /> construction on fill soils and a 10' lot line setback. Soil testing <br /> for this system identified a seasonally high water table between 18" <br /> and 40" requiring a mound type system. Fill soils were identified <br /> over one corner of the proposed treatment area requiring a variance to <br /> the state and local ordinances. As the underlying soils appeared to <br /> be suitable for sewage treatment and no other options were available, <br /> the variance was granted. The City requires a 20' lot line setback <br /> but, a 10' variance was also granted due to site limitations. As this <br /> system meets the required 3' vertical separation from the seasonally <br /> high water table, this system is considered to be a conforming system. <br /> This has been confirmed by Mark Westpetal of the Minnesota Pollution <br /> Control Agency. <br /> The new septic system although requiring variances is considered more <br /> conforming than the original system for several reasons. The old <br /> septic system was constructed using concrete block septic tanks which <br /> are not considered to be sealed tanks and are undersized by today's <br /> standards. Also the drainfield of the old system did not meet the <br /> required 3' vertical separation from the seasonally high water table <br /> which is one criteria for classifying the old system as being non- <br /> conforming. The current system however, was constructed using precast <br /> concrete tanks which have no seams and the mound system does meet the <br /> 3' vertical separation from the seasonally high water table and is of <br /> adequate size for the four bedroom residence based on state and local <br /> codes. <br /> ch <br />