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TO:Jeanne A. Mabusth, Planning and Zoning Administrator <br />FROM:Stephen Weckman. On-Site Systems Manager <br />DATE:May 8, 1996 <br />SUBJECT: Subdivision Application #2136 Greenfield Corporation - Septic Review <br />The applicant proposes a six lot subdivision requiring the use of on-site sewage treatment systems. <br />Five of the lots are show n with new residences and tw o drainfield sites on each. The drainfieid sites <br />for lots one through five are all located on slopes of six percent or less as required by city ordinances. <br />The alternate drainfield site on lot four lies fifty feet from a type two wetland, not located on the City <br />or State wetland inventories. No setback is required from this type of wetland. <br />Lot six, which includes the existing residence, is very limited for drainfield siting. The existing on­ <br />site system was observed to be surfacing in 1993, was slightly surfacing in 1995 and is surfacing <br />significantly now. The system has not been confirmed as meeting the three foot separation from the <br />seasonal saturated zone and would likely not pass. Therefore, two drainfield sites are required for <br />this lot. Two drainfield sites have been identified north of the existing residence. The primary site <br />lies on slopes of six percent, but the future site requires a variance for slopes up to eight percent. <br />The primary site will also require a variance to be located 60' from the well. Both sites meet all the <br />State standards for slopes and well setbacks. The sites also meet the required 75' setback to the <br />wetland. <br />In summary, all six lots have suitable drainfield sites for on-site systems, but lot six will require a <br />staff variance for slopes of up to eight percent and a well setback of 60'. Staff is willing to approve <br />the variances since all State standard are met and the City standards will not be significantly <br />compromised.