HomeMy WebLinkAboutBLD2007-00077 Stormwater Management MACLEAI ISBERRY ENGINE LING P . S.
Civil Engineers 0 Land Planners
Stormwater Site Plan. (SWPPP)
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TVIE
MAR 2 8 2007
"Rtic JEFFERSON COUNTY DCD
or
Lot 165 Port Ludlow No. 5
APPROVED PC NJ,
STORMWATER PLAN Prepared for: Q ° �►.��
MAY 2 1 2007 Joe Kllnker o
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March 2007 Si4N
JEFFERSON COUNTY
DEPT.OF O. UN Y D YE NT
SIGNATURE: EXPIRES: JUNE 7, 2008
i i800t 600-4600
Job No. 27506
159 Wyatt Way NE x P.O. BOX 65382
Bainbridge Island WA 98110 0 " Port Ludlow WA
,r A � 98365
(206) 842-7716 " (360} 437-0430
(206) 780-2408 (facsimile) � (206) 780-
2408(facsimile) V` IAA .
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•Stormwater Site Plan (SWPPP) •
Lot 16, Port Ludlow No. 5
The proposed project is a single-family residential development located immediately east
of Montgomery Drive and north of Jackson Lane in Jefferson County WA. The site is
approximately 0.48 acres in size and slopes towards the east. The proposed residence will
be built on the westerly portion of the site which is cleared of trees and slopes moderately
@ approximately 7%. The Easterly portion of the site slopes steeply @ over 40%down
to the shoreline of Port Ludlow Bay. This area is well vegetated and will remain un-
disturbed.
The proposed development will result in approximately 5700 sq. ft. of new impervious
surface. Concentrated stormwater runoff resulting from development could result in
erosion of the steep easterly slope of the site. A tight-line is proposed to mitigate this
probable impact. This will consist of a 6-inch high-density polyethylene pipe (HDPP),
which will be laid along the surface of the steep slope. Surface water runoff and footing
drain discharge will be collected and safely conveyed to the toe of the slope in this pipe.
A 20-foot section of perforated pipe will be installed at the point of discharge to disperse
flows preventing scour.
Erosion control BMP's as specified by the Washington State Department of Ecology
Will be employed during the course of construction. These will include at a minimum;
silt fencing, straw bales, a gravel construction entrance, and ground cover stabilization.
FIGURE 4.2,.1.0 CORRUGATE TAL PIPE COUPLING AND/OR GENE*PIPE ANCHOR ASSEMBLY
12" ►
rill.1111111111111
1 1 i
Smooth Coupling Band
for Smooth Pipe
material to be 9
ASTM A 36 1/4"
plate galvanized lc
after fabrication —1--- m
per ASTM A 123 , " .�� i �.�/�.�,,,^ �%/r�`~'
CT., ,I
slots to be 03
all holes 119/32 x 1/4" 7:1-
3/4"diam.� _ pipe stakes
v�
c' ,
41/2" � ►17/g" 17/8"► 7"coupling band
`: 12" 41/2" r 12"or 24"coupling band
Plate Detail
coupling band collar(2"pipe) NOTES:
1' — 1.The smooth coupling band shall be used in
1/4" /�_ 1/4" combination with concrete pipe.
^
i- I plate(see detail) 2. Concrete pipe without ball and spigot shall
' material to be ASTM not be installed on grades in excess of 20%.
................) fi A 36 galvanized after 3.The first anchor shall be installed on the first
11/2"x 6'stakes--AV fabrication per ASTM section of the lower end of the pipe and
flatten to point each side of culvert A 153 remaining anchors evenly spaced throughout
the installation.
Anchor Assembly - 4. If the pipe being installed has a manhole or
Corrugated Metal Pipe catch basin on the lower end of the pipe,the
first pipe anchor may be eliminated.
5.When CMP is used,the anchors may be
attached to the coupling bands used to join
the pipe as long as the specified spacing is
not exceeded.
6. All pipe anchors shall be securely installed
before backfilling around the pipe.
9/1/98 1998 Surface Water Design Manual
4-14