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SPECIFICATIONS <br />PROPOSED ON -SITE DISPOSAL SYSTEM <br />BOB ROBERTSON <br />NEAR INTERSECTION OF STUBBS BAY ROAD & WATERTOWN ROAD ON <br />WATERTOWN ROAD - ORONO <br />SEPTIC TANK - Two 1000-gallon capacity tanks, in series, <br />manufactured and installed in compliance <br />with City code. See Figure 2 for location. <br />DOSING CHAMBER - One 500-gallon capacity tank downstream <br />from the second septic tank manufactured <br />and installed in compliance with City code <br />for septic tanks, including a siphon or pump <br />with discharge rate of no less than 25 gpm. <br />The purpose of the dosing chamber is to de- <br />liver septic effluent to the drainfield in <br />periodic doses of 450 to 500 gallons at rates <br />of 25 gpm or more rather than in smaller, <br />more frequent applications. See Figure 2 <br />for location. <br />DRAINFIELD - Indicated average percolation rate is 19.6 <br />minutes per inch. State code required mini- <br />mum 208 square feet of drainfield area for <br />each bedroom at this percolation rate. <br />Proposed total drainfield area is 1000 square <br />feet. Proposed drainfield trench bottom <br />width is three (3) feet having a 2.5 square <br />feet effective area per lineal foot. The <br />required le of drain tile line is 400 <br />feet. Four as 100 feet long and 8 feet <br />apart are : .,unended. <br />Proposed drainfield locations are shown in <br />Figure 2. Drainfield trench details showing <br />materials and installation are shown in Figure <br />3. Estimated quality of washed gravel or <br />crushed rock for pipe bedding is 75 cubic <br />yards. Figures 1 through 3 are, by reference, <br />made part of these specifications. <br />