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Home My WebLink AboutRe: septic system � o�;.� 0 0 ; , �.,_ _ C��' of ORUNO � � � , ,. �r �tun;o�pal offi�es 1 y -k ' �' Post Office Box 66 �\\�� ,_,f'.-'` a`�G~%; c��aa�,��ta��3� , \k'ESI3�4%/ � May 31, 1991 Randy Rosengren 1709 North Farm Road Long Lake, MN 55356 RE: Septic System Repairs Dear Mr. Rosengren: This is a reminder that a recent inspection revealed that your septic system was failing and must be repaired. Please contact me within 30 days to discuss your options. You have 90 days in which to make repairs to the system. Enclosed is a copy of your most recent septic report. The procedure for initiating septic system repairs is as follows: 1. Hire a Soil/Site Evaluator to do the necessary testing and design. 2. Submit the design to the City for approval. 3 . Once the design is approved, have one or more contractors bid on the approved design. 4. The contractor you choose should then obtain a permit from the City before starting work, and he will call for the required inspections. If you have any questions please contact me at the City offices. Thank you for your prompt attention to this letter. S�ncerely, • Stephen Weckman Septic System Inspector SW/lsv , TELEPHONE—473-7357�FAX-473-0510 � o� . � 0 , o � � �-� �� CITY of ORONO ,��,' � II � ,�� °l��=�' ti% M,��oe� �� "� �, �`�':t;.�..�} �,�, Post O�ce Box 66 '� `i�;,��;�sr�� Crystal Bay.Minncsots 55323�0066 �,�kES�K�g,�i October 10, 1991 Mr. Randy Rosengren 1709 North Farm Road Long Lake, riinnesota 55356 Re: Septic System Repairs Dear Randy: This letter is to follow-up our discussions in September regarding repairs to your septic system. As we discussed, from your monitoring of the system, there does not appear to be excessive water use nor .is there any significant visible ground water seepage into the tanks. However, it was clear during our inspection on Monday, September 16th, that 80$ of the pump discharge to the mound was draining back as soon as the pump turned off. Further, the rock bed in the mound was observed to be in a continuous saturated state while the sand bed below the perimeter of the rock bed was not saturated. It would appear that the effluent being pumped into the rock bed is perched above the sand bed due to some hydraulic barrier. In theory, a "biomat" should normally form between the rock bed and the sand layer, acting as a valve to create an unsaturated f low of effluent downwarcl through the sand bed. The aeration that occurs during this unsaturated flow helps treat the effluent before it reaches the original topsoil for absorption into the ground. The area of the rock bed is sized based on a presumed acceptance rate of 1.2 gal lons per square foot of rock bed per day, the expected f low rate through the biomat once it is formed. It seems likely that abnormal factors have affected the permeability of the biomat at the interface between your rock bed and sand. These factors might include sand containing excess fine materials; clay or silt particles that have washed down through the rock bed and formed a barrier at the rock-sand interface; or possibly a site location that encourages runoff from the adjacent driveway through the sand bed of the mound, which would lead to an intermittent saturated condition in the sand bed which would not allow the biomat to break down at the rate it is being formed. This would yield a thicker biomat with slower permeability and ultimate hydraulic failure of the system. TELEPHONE-473-7357�FAX-473-0510 �- Mr. Randy Rosengren . October 10, 1991 Page 2 • At any rate, the two apparent choices for resolving the current problem are to repair and expand the existing system or replace it entirely. Given that your alternate site is at the base of the slope which would greatly increase the costs of system construction, it would make sense to try to make the existing system function. As we have discussed, the logical repairs to your system given the current condition would be to expand lengthwise towards the road, and replace the rock bed in the existing mound. The intent of this would be to increase the amount of absorption area and the size of the rock bed so that the daily discharge to each square foot of rock bed will decrease. Additionally, replacement of the rock and removal of the accumulated biomat at the rock sand interface will hopeful ly give the system a clean start in biomat formation. Your septic contractor should meet with the Septic Inspector, Steve Weckman, to establish the parameters for these repairs. I want to reiterate that by allowing the repairs as described above, the City is in no way guaranteeing that the repairs will accomplish their intended purpose, but we feel that you would be taking the most logical steps from a technical and economic standpoint to solve this system problem. If the proposed repairs fail to yield a system that does not discharge to the surface, additional solutions would have to be considered. Please feel free to contact me if you have any questions. Sincerely, � �� MICHAEL P. 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