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�.� ; :.,� ' � ��'i_ <br /> TO: 2625 Fox Street <br /> FROM: Stephen Weckman, On-Site Systems Manager <br /> DATE: August 26, 1992 <br /> RE: Septic System Replacement <br /> The intent of this memo is to document the replacement of the failing <br /> septic system at the above address. <br /> This residence has an existing failing system which discharges to the <br /> surface. A site evaluation has been completed with soil borings <br /> indicating a seasonally high water table between 12" and 46" deep. To <br /> adequately treat septic effluent, a pressurized mound system would <br /> need to be installed. This site has slopes between 6$ and 20� which <br /> would require a variance to the City codes . <br /> No system is available that would meet the septic code which treat the <br /> anticipated waste from the existing residence. State code will allow <br /> the mound system to be designed on slopes greater than 6$ , however <br /> this will require area greater than what is available on this site. <br /> Another option would be to install holding tanks with the eff luent <br /> hauled off site which would cost approximately $3, 600 to $4, 000 per <br /> year with low water use facilities installed throughout the house. <br /> City sewer is not available in this area and is not likely to become <br /> so in the near future. Both an undersized mound system and a holding <br /> tank system are undesirable options as the existing residence would <br /> always be restricted by the system intended to serve it. <br /> An alternative system has been accepted by the City of Orono. A Class <br /> I aerobics treatment system, multif low waste water treatment system <br /> will be used with shallow trenches 18" deep. The residence is a 3 <br /> bedroom home which will require 660 s.f. of drainfield with 12" of <br /> rock below the pipe. The bottom of the treatment area will therefore <br /> be approximately 1' above the seasonally high water table. A variance <br /> for the system will be required as the trenches will not maintain the <br /> required 3' verticle separation between the bottom of the distribution <br /> area and eliminating soil characteristic identified by soil mottling. <br /> A variance will also be required as the proposed drainfield site is <br /> approximately 55' from the existing well. The well does need the <br /> State setback requirement to a drainfield area which is 50'. <br /> This septic system is an experimental alternative system and therefore <br /> will have the following conditions apply. An alternate area east of <br /> the house is to be protected for future use if the proposed system <br /> fails. This would be a mound system designed for approximately 200 <br /> gal. per day which is approximately a 50� reduction in water use. If <br /> this site is used, the well will need to be relocated. A water meter <br /> must be installed prior to the septic system installation to gauge the <br /> amount of effluent entering the septic system which must be monitored <br />