HomeMy WebLinkAboutCorrespondence PLANNER 3/10/2011
L1MBIRD Andrew
-:5'......8 'Z-oo'l -00001
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L1MBIRD Andrew
Thursday, March 10, 201110:06AM
'Jimmy Weese'
RE: Type II Tenative Partition Review, Staff report and Decision
drywell & soakage trench diagrams.pdf
Mr. Weese: Attached are example diagrams of a drywell and a soakage trench from the City of
Portland's stormwater Management Manual. Either option should work for the panhandle parcel
you are looking to purchase. The Mortier Engineering study can be used to determine the
appropriate size of the drywell or trench based on the amount of runoff and impervious
surface area. Please contact me if yoy have any questions or require additional information.
Thanks
/
Andy Limbird
City of Springfield
-----Original Message-----
From: Jimmy Weese [mailto:jimmyweese@gmaiLcom]
Sent: Thursday, March 18, 2811 9:28 AM
To: LIMBIRD Andrew
Subject: Type II Tenative Partitio~ Review, Staff report and Decision
Dear Andy: I am trying to purchase parcel 2 of this partition and was given a copy of the
above subject on my trip to the City of spfld. On page 13, it says that parcel two should
have two paved off street parking spaces. Is.this for the panhandle lot? Is number two
parcel the panhandle lot? At present there is no paved parking spaces on the property. On
another issue, I am trying to find out if I need to install a Soakage Trench. Has there
been a study done on one and can I obtain it to find out the directions or specs. On how to
construct one? They gave me a Mortier Engineering study dated Aug. 2, 2887 calling it a
storm water management system study. Is this the soakage trench study? On the fourth page
is that the specs for the trench? Can I get someone to interpret it? Thank you in
advance for any help you can give me. Sincerely JIM WEESE. Home phone number 1-541-679-8632
1
Date Received: .3 }JD I V>/ I
Planner: AL
(
~D
10' MIN
.:S''-I.6 2DD'l- 0000 I
s' MIN
FROM PROPERTY LINE
,!""f,
'2" THICK LAYER OF I" TO
2-1" ROUND ROCK BETWEEN
PIT UNING AND EARTH WAll.
UP TO lHE UD.
1< ~
@ ~ '11
~ ~ '11
SEE DR'Y'NEll SIZING CHARTS
FOR REOUIRED DEPTH AND
DIAl.4EfER. UINIt.4Uf,l HEIGHT =
5FT, f,4INIUUU Dw.lffiR = 28"
1. Provide protection from all vehicle traffic, equipment staging,
and foot traffic in proposed infiltration areas prior to, during,
and after construction. .
2. Siting criteria: Gravelly sand, gravelly loamy sand, or other
equally porous material must occur in a continuous 5' deep,
stratum within 12' of the ground surface.
3. Sizing: Exhibit 2-36 is used to appropriately size the
drywell(s) based on the amount of impervious area that
each drywell is designed to manage. This chart shall be
used as guidance, is based on field experience, and should
be used as minimums only.
4. Orywell shall not be installed where base of facility has less
than 10' of separation to water table.
5. Top of drywell must be below lowest finished floor.
6. Setbacks (from center of facility):
a. 10' from foundations
b_ 5' from property lines
c. 20' from cesspools.
7. Piping shall be ASS SCH40, cast iron, or PVC SCH40. 3"
pipe must be used for up to 1500sf of impervious area,
otherwise 4" minimum. Piping must have 1 % grade and
must follow current Uniform Plumbing Code.
- DR/\. \V.lJ\{; NOT TO SCALE- -
Exhibit 2-36: Drywell Sizing Table
nce approval has been given by 80S for onsite infiltration of stormwater,
the following chart sholl be used to select the number and size of drywells.
Gray boxes are acceptable.
II.lPERvlaus
Area
('q-ft)
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
28" Diameter
Drywell Depth
48" Diameter
STORMWATER MANAGEMENT MANUAL TYPICAL DETAILS
NUMBER
- Simplified 1 Presumptive Design Approach -
Drywell
SW-170
Date Received :
Planner: AL
31101..2-011
, I
SVl6 2..0<:>, - DoOO I
.,
CAP END OF
PERF PIPE
'0'
AI",
sc0
\'0'0'0
, ~"",
').'0
OPTIONAL:
TRAPPED SILT BASIN
(SEE DETAIL A)
30"
TRENCH TO BE CUT INTO
NATIVE SOIL ONLY!
DETAIL A: OPTIONAL TRAPPED
SILT BASIN DETAIL
DETAIL B: SOAKAGE TRENCH
CONSTRUCTION
12"MIN. ,I saUD SCREW
r----1 . DOWN un
--1 r-'" I
#T~~~'] . [)~~~-;'PE (UIN)
INlET -.!~ 12t
Olllill
(DOWtffiJRNED
PIPE ELBOW
OR HOOD)
FILTER FABRIC TO BE
PlACED ON SIDES AND
ENDS. TO FOLD OVER
AND COVER PERF. PIPE
AND DRAIN ROCK.
12"MIN.
~"-2)f WASHED DRAIN
ROCK
. THE BOTTOt.4 OF THE
INlET PIPE I.lUST ./iQI BE
lOWER THAN THE TOP OF
THE OUTlET PIPE.
UNE TRENCH SIDES WITH
FILTER FABRJC AS SHOWN,
ADD 1 B" OF DRAIN ROCK.
PLACE PERF. PIPE AND
CO'v'ER.AlL
- DRA W.1NG NOT TO SCALE -
STORMWATER MANAGEMENT MANUAL TYPICAL DETAILS
~
- Simplified / Presumptive Design Approach -
Soakage Trench
East Side
NUMBER
Bureau of Environmemal Services
SW-180
Date. ~eceived: :.3/ 10.1 ;J<>/I
Planner: AL
Sl.<.6 ~'1 ~ 00001
~
CAP END OF
PERF PIPE
12"MIN
TO TOP
OF PIPE
0>
SO'"
,,,,,,,
, ~S'<-
0"
36"
OPTIONAL:
TRAPPED SILT BASIN
(SEE DETAIL A)
TRENCH TO BE CIH INTO
NATM SOIL ONLY!
DETAIL A: OPTIONAL TRAPPED
SILT BASIN DETAIL
DETAIL B: SOAKAGE TRENCH
CONSTRUCTION
tnHN, I saUD SCREW
r-------1 ' DOWN un
4~'" .
....._>I<-,.,._,..,.~ _....._....._"'_w_...............
II If:-( .
;p;t "~J . Ir~ 3 PIPE (.'N)
~rL~ "".'N.
INLET ~~
ounn
(DOWNTURNED
PIPE ELBOW
OR HOOD)
. ALTER FABRIC TO BE
PLACED ON SIDES AND
ENDS. TO fOLD OVER
AND COVER PERF. PIPE
AND DRAIN ROCK.
,,-
JI'., JI" WASHED OIWN~ 36"--J
ROCK
. 1l-IE 80TTOU OF THE
INLET PIPE !.lUST ~BE
LOWER TlWl THE TOP OF
1l-IE OUTLET PIPE:
UNE TRENCH SIDES WITH
FILTER FABRIC }S SHOWN,
ADO 18" OF DRAIN ROCK.
PtACE PERF. PIPE AND
CCM:R ALL
, DRA W.lN(; NOT TO SCALE"
STORMWATER MANAGEMENT MANUAL TYPICAL DETAILS
Ii:J
" Simplified I Presumptive Design Approach -
Soakage Trench
West Side
NUMBER
Bureau of Environmental Services
SW-181
Date Received: 3/)0 J;l<>/l
.. .
Planner: AL