NCG550125_SiteMaps

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_ A overfill to allow End View B
/ - for settlement —�
4'-6' � 10' min.
U 5
AI 1
I ��—Untreated bldg. paper l
4
J )� 3/4-21/2' stone
+ Fine gravel +
1. ".`. . . . ; .. ..'. . :'r :; : .. .:•.'•" :.
Filter Sand :'•', Filter'.'.'•', ':: ':Sand`':
_ :l•r:'' +` [ • !' •� 21/2" stone �' ••g' ..
+ v Fine gravel + '
Grade board
A NO SCALE 30"B"
NOTES
1. Filter sand should be clean and coarse, with an
Joint covering(bldg. paper,etc.) 8"min. effective size of o,3.T— o.$o mm,a uniformity coeffic-
rght joints Open joints - ient less than 3.0,a a dust content less than 0.5%.
2. Sand should be thoroughly settled by flooding
or other means before distribution lines are
placed at final grade.
3.Effluent should be chlorinated
Section
B-B 4. End of distribution line to be plugged.
4"V C. perforated pipe' ' •4" V. drain~the 18" min.
Section A-A (bell and spigot)
FILTRATION TRENCH
STANDARD PLAN
-Open joints':,'.,::• .Open,joints WATER QUALITY DIVISION
OFFICE OF WATER AND AIR RESOURCES
4" V.C. Bell and — - - - 8" N.C. DEPARTMENT OF NATURAL AND ECONOMIC RESOURCES
spigot pipe PREPARED FOR: G.LU/a[,ta.
Uniform grade- S%Ica' Uniform grade-3"/Ioo' BY, OATEI
(both lines) (both lines) SHEET_ OF

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