1990-06-11 Planning Commission Minutes

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Zoning File #1536 June 11, 1990 Page 3 of 4 A variance would similarly be required for ccr---�rsion of the deck on the south side of the house to a screen porch, since portions of that deck are less than 30' from rhe north lot line. Side street lot line setbacks would be required also under the first 2 scenarios. If applicant acquired the entire alley, his house would b•• at the 50' required setback from Landmark Drive. 3. Hardcover within the existing property boundaries is within the prescribed limits. However, much of the driveway and existing garage are outside of applicant's property. The most reasonable and consistent method for determining a hardcover percent would be to presume that applicant will gain half of the alley, and credit him for his existing property, half of the alley, and the area of his improvements that occur outside his property. This is shown An Exhibit H. Having spent more than an hour reviewing hardcover numbers on this application, my estimation is that the proposed additions per the architect's plan, fall within the letter and intent of the hardcover ordinance under the assumptions noted above. III. Discussion - Septic System Concerns The existing system is ex,remely substandard, even after drairfield additions that were done in 1987. Those additions were done on aninterim basis (see Exhibit I). There is one relatively small septic tank, and approximately 400 square feet of drainfield. Making reasonable assumptions about the Kilkenny loam soils mapped in this area, one would expect a perc rate of 30-45 minutes per inch, requiring 300 s.f. of drainfield per bedroom. The proposed 3 bedroom house should have 900 s.f. of drainfield, but less than half of that exists. It is unlikely that the existing system could be upgraded to serve a 3 bedroom house within the setback and design requirements of the sepA c code. From Exhibit J, expansion area is very limited, even with additional land from the alley. There would not be room available to develop a mound system if soil conditions indicated one was required. No testing has been submitted. Based on this, staff would not recommend approval of expansion of this house to 3 bedrooms unless municipal sewer was available. A decision by the City Council whether or not to seer this area is still pending.