1981-10-19 Memo, 1285 Brown Septic System Pg1C

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Police Building Septic System Page 2 4. SITE LIMITATIONS AND VARIANCES TO CODE NEEDED Two major limitations present a situation on this site which severely limits the potential for use as drainfield. First, the entire west side of the site is at the bottom of a; -.slope, so that spring runoff and heavy rains will tend to accumulate in the area currently used for drainfield. Second, the proximity of the property lines and buildings leaves very little area which can be used for drainfield without variances to the code. Specifically, the minimum setback from property lines to drainfield is 10'. The recommended minimum setback of drainfield from hardcover, buildings, etc. is 20'; 10' is a minimum that should not be compromised. Adhering to these 10' minimums, only 300 sf of drainfiela (in a bed rather than trenches) can be constructed west of the police building. The only way to gain the additional square -footage would be to run a line around the police building to the lawn area east of the building. The elevations might be such that a pump would become necessary to keep the trenches from getting too deep. Also the proximity to paved walkways and parking area might cause freezing problems in any system to the east. The utility lines between the police building and the shops would have to be moved to accommodate any drainfield in that area. Another option is to reroute the indoor wasteline towards the front lawn area towards the east, and construct the system. RECOMMENDATIONS: 1. Recognize that a system that will meet all requirements of the code (based on soil capability and water use assumptions) cannot be installed west of the police building. Furthermore, rerouting everything to the front of the building will disrupt existing trees and walkways, as well as necessitates plumbing changes in the basement. The bottom line is that you can probably get by with a minimal system for current use, but any expansion of use might create a need to use the front yard for drainfield. 2. $ee attached sketch) Eliminate existing septic tank. Replace with a 1500 gallon 2 -compartment precast tank. Add a bed drainfield of approximately 370 3f as per sketch. Add gutters to both buildings to eliminate roof runoff from the drainfield area. Re-route underground utility lines between buildings. 3. As an added comment, note that no good area exists for drainfield for the Council Chambers other than the front yard of the police building. Use of this area would require a pump station should the Council Chambers ever have toilets. The entire Council Chamber/Shops/Police Building complex really does not have the open space availabe for adequate and conforming septic systems to serve those units.