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TBLE DEWATEP, ING ALTER.NATIVE ON-STI"E SF~WAGE SYSTEM A "Tile Dewatering" septic system means a systeta where a standard dis~!x>sal field is installed and a dewatering twnch is dug on ail four side$ of the disposal field. The purpose of the system is to lower the naturally occurring water table found on tho property during the wet, winter moati~. This allows the dispOSal field to function properly in unsaturated sell coaditionz. ~neral Conditions for A;~eroval: On-Site system construction perrrd~ may be issued by this offic~ for tile dewate~rlng SystemS provided the following rcqui~ments can be met: (2) (4) The site ~ a natural outlet that will allow a field tile installed on a proper grade around the propo~gt absorption facility to daylight ai~ov¢ the annual high water. Soils must be silty clay loam or coarses texture and be dralnable, with a minimum effective soil depth of at least thirty (30) inghe~ in soils with tetrlporary grOUndwater; and at te~t seventy-two (72) inches in 80ils with perma~mt groundwater. Slope ia the area of the proposed disposal fie, id docs l~ot exceed three (3) pere~t. All other requirements specified in the Department of Envb:oume~tal Quality rules for the system, except depth to groundwater, can be mot. Howgvg, at~et tho field collection drainage tile is installed, the grotuldwater levels shall eOn~orm tO the appropriate requirements of the D.E.Q. rules. nsf lion 're : (1) Field collection drainage tile shall be tast~led on a uniform gr~e of two-tenths to four-tenths (0,2~0.4) f~t of ~1 per one-Eun~d (100) (a) A mi~mum d~ of ~i~-six (36) inch~s in soils wi~ ~ gro=dwatet) OR ~) A minimum d~ of stx~-s~ (66) in~ ~ soils wi~ ~ ~dwater. (2) ~e ~imum dra~ge tile ~ec~g ~ ~ sevea~ (70) f~, ~ter ~ ~nter, (3) %e ~nimum hori~aM s~ar~on dls~ ~n ~e ~r~nage tile =d ~ ab~tion fglli~ shill be ~en~ ~0) f~t.. (a) ~e field coil~ioa ~ file ~I ~ ~id, ~ w~I, ~ffo~ pi~ wi~ a ~inmum di~ter of four (4) twelve (12) i~ of~e soft s~e ~ m~ wi~ ~ g~dwa~, OR ~ wl~ ~iny (30) inc~ of ~e soil s~f~ ~ ~ils ~ p~an~t ~u~dwater. ~e ~ media shill be ~v~ed wi~ filter fabric, t~ b~g pa~ Or o~ n0n~le ~t~ ~prov~ by · f~ office. (6) ~e outlet tile ghgI be rigid, ~moo~ ~1, *01id PVC pipe wi~ a ~im~ diabetes of four (4) ~n~. ~e ouaet end ~h~l be pwm~ by a ~hon s<tion of PVC pl~ ~ti~ et ex~di~ ASTM ~dmd D-3034, wi~ a flap gate or gfi~ to ~elude tod~ts. (7) A silt trap with a twelve (12) i~h ~i~um di~eter shill be ~tall~ bO~n th~ field collection d~in~e tile ~ ~e o~ pi~. %e ~om of the silt trap ~1 ~ a ~im~ of ~elve (12) in~ below ~e ~ven of ~ drain~ pipe outl~. (8) %e O~age pipe ~ tile ~nage ayste~ ge iate~ p~ of ~e s~fic synC, but do not n~ t0 meet setbac~ requ~m~ to ~ro~ lines, well~, s~, I~, ponds or o~er surface waterbodies. (9) M~ion ~unty h~ the dis~gfion of requir~g de~om~ioa that a pmpo~ tile dewatefing 8~te c~ ~ droned g~or to i~i~ a Co~on-lm~l~iun pe~t. (10) The abso~tioa f~ility sh~l uae ~qufl or pre~ou~ed d~Mbution,