HomeMy WebLinkAboutCOM Plot / Site Plans - 9/7/2004 / N
1980 NE Old ,,� ce b. Description of Existing Vegetation,cont'd: Douglas firs,Cedars,
Belfair Hwy - E Nissan County Clearing and Approval Block
and ground cover most of the east third of the property as shown in the
Q W
engineering drawing. This will be left all natural by the property owners.
e- V 92.8'EI.at 18"invert.
r - - - - -
Reviewed by: c. Description of Existing Drainage: A 12'diameter culvert under the
Is S Old Belfair Highway located just outside the northwest corner of the
/ Existing 18'dia. Approved by: property and then oonneds to the oounty's 24"culvert which then g
county culvert Drainage ditch(swale) °
ntY into a drainage ditch on the north side of the property and then the rrt
? to handle overflow conditions Date: surface water runoff flows into an 18"diameter culvert which runs dow+r� CI). tT
/ han the 24'culvtrt durir� the middle of the property from the north to south as shown in the drawl L�
i s ous r heavy,continuous Note: Clearing and grading limits are shown in light blue Finally,the surface water runoff flows into an existing 517 x 100'Exisiti O �n
1T dit Ctdvert y �drainage in the drawing below sedimentation pond before flowing into a naturally vegetated drainage ,
aQ sq. __ dltch(emle
Paved neigborhood with several ��` ar -\Zz --- ditch leading to the Union River.
parked vehicles on this side of the --_-_ _- - . Adjacent Area s
roadway.(Conrtribute#1DSurface �S' 1 �. g - C r - Parcel#12317�1 00050 99 I. Description of adjacent areas which may be affected by
water runoff) �' + 0 1TSlia.s t4G��.80" -� X 118 EI. Proposed drainfleld -- Proposed drarnfield ==-- the site disturbance:
t -_ _ti_-- -I ► a. Streams: The Union River is located at the southeast
- __ comer of the property and an unnamed creek is located
r
- - ____ outside the west end of the property that flows under the
X 97.1 EL X L a P Wien(8!, X 105 B. - - - - - Old Belfair Highway.
k 96'EI
)C87.8'El. X 87.8!p, b. Lakes: There are no lakes in the vicinity of the property.
This week has overflowed " sq-4t X 104'Et A c. Wetlands: Wetlands are located on the south side of
toward the 17'culvert �' _1T dia.PVC pipe- i ed•area i�' , ; ; 2 ele This area to be left all natural
----- -e „ , the property along the drainage ditch swale as shown in
during the winter and spring consisting of trees and meadow
R9 .3I. X 9t161. X 93.T,EJ. -,, ,, the drawing. Appropriate setbacks have been provided
mom / ; - _ for the location of the expanded sedimentation pond.
- ; - _ - d. Residential Areas: The main residential is located on
� ----�------------ �� �' -_-� ., r� �-K96 � - ParoelYkt�17-41-00060 � 8�
/ - -- _ - an elevated plateau and is not affected by the asphalted
Peninsula )C 6 E� x 100' i �/i X 9l. ---% ';, r '--- -- X 86.5'EL -XST7EI..- surfacing project. A24'x 35 house is located at the
x
Truss Company 0dition < �; Q '" --- "" northwest corner of the property but will be removed
_ 50'x 10t7 X 89;9I\;; 1 1 + --- _ during the paving operations. A 12'x 5T trailer will remain
' --__ __ ___,------------ _ _� - ,aC 8T El. located a west end of the property and is also not
-------- ---------------- - I m
0 9p 7 ,, - affected the i work
X E►:y�y+y - 500' -690 9017 1 bI' Pam'n9
L : ------ -----'------- -- ---- - -`-- -N'-------------1----------------�- /'';a-------'---__---- --------------u---------------�- e. Roads: The Old Belfair Highway runs from the southwest
3f5CYF1`-- -X . fl.----XWEt----------- 9 Y
9T96 �, - gg Drainage ditdr(swaly ),06.6 El. X 85 3'EI. to the northeast direction at the outside NW corner of the
97 - '' , X 86.2 El. property as shown. A 12'diameter culvert under the
14,'' +--- fcx 6 month storm
Install 2'dia.pipe ;�-' X 90.E El. -�E89'-El:___`R =p s -'X��` •,,' \ Tf�b Brea to be left all natural highway helps to drain water off the highway and from the
to proposed drainfield 91, - \ '' 'consisting of trees and meadow unnamed creek located outside the west end of the
at NE comer of property -' 18"dia,,culvert property.
22;500 sq,fL settling per} - =- from 6'hi h x 16'dia Parcel#12317 4100070 it
100'x 200'x 7'settli 9 t. Other. A 50'x 100' truss manufacturing facility will be
Existing 12'dia,, - - paved area _ wtm 3:1(V H)side slope _ riser-ia ss thing pond erpoWed to 59 x 200'with new asphalt surfacing
culvert to be tutu %X 88 4'EI. (refer to attached WWHM2 x 10b ;;Xt 3^ amu d the building as shown. A 40'x 80 storage
removed ! X 89.4'EI., simulation results) ----- B. building is located on the north side of the property with
/� _ $ o ' ; ,r'' the 19'culvert running underneath it.
xidRIVER
2017 imeter ' --"--" It. Description of the downstream drainage path leading from the site
Install 12'dia. __ 'd J ' - t 25'setback to the receiving body of water. (Minimum distance of 400 yards,)
---�E88'�I._---- ---X-196El. X88¢Ek
culvert for 4►orm - "- - __ - - from wetland During heavy rainfall the surface water runoff flows into a 1 00'x 200'x T
sewer 88' -------------- --'' sedimentation ponds and then into a 6'high standpipe which leads to
_ -- - -- natural vegetated drainage ditch where the surface water runoff is
2. Project Description further filtered before it flows into the Union River. The vegetated
8T 12 Required Elements for the Construction Stormwater Pollution Prevention Plan a. Total Project Area: 5.75 acres drainage ditch ads es a biofiltration facility that runs nearly 300'before
86 b. Total proposed impervious area.4.67 acres flowing to the river.
1. Mark Clearing LWs: Response: Clearing AMits are identified in the above drawing c Total area to be disturbed 4.48 acres
DESIGN GUIDELINES and will be marked by survey stal<4 for to construction. 6. Critical Areas
2. Establish Construction Access: Response: Main construction access is already in Existing Site Conditions a. Description of critical areas that are on or adjacent to the A*
August 2001 Stormwater Management Manual for Western Washington,August 2001 place and is located on the south side of the existing Peninsula Truss building. A relativlely steep embankment is located on the east side of the
3. Control Flow Rates: Response: Refer to the attached Western Washington Hydrological a. Description of the existing topography:The proposed paving area that will need to be protected from slides and
POND SIZING Model 11 computer simulation results for this basin which automatically sizes the retention general area of the expansion of the paving soil erosion during heavy extended rainfall periods. An unnamed
pond using actual rainfall data starting in 1955 to 1999. It is recommended that constructlon is relatively level ground with a difference in is located at the outside west end of the property which flows under
Computer simulation: Western Washington Hydrological Model version 2( the Old Belfair Highway but is not affected by me proposed paving
with continuous simulation hydrology(HSPF). Predeveloped Mut(Mason Corawnty 4ttty a a t takes Place during me drier months of the year from June through October to minimize evation of about 13'with an elevation of 96.3'
project-
1980 Old Belfair Till forest=5.75 acres,impervious surface=0.71 acres(from surface water runoff during construction. the north side of the propertyto 83.5 on the
) �)' 4. Install Sediment Controls: Response: All bare soil areas will be covered with visqueen south side of the property. The residence lies b. Description of special requirements for working in or near critical
Post developed input:Till forest=0.79 acres,till grass=1 acre,impervious a"(roof)= areas: The recommended BMPs for stabilizing the 60 to 70%
0.32 acres,streets,sidewalk,parking=3.85 acres,pond=0.5 acres.(Refer to drawing at the end of each days work during periods of rainfall greater than 1"in a 24 hour periods. on a plateau at an elevation of 104'as shown embankment is hydroseeding,mulching,and/or the use of biodegradable
above for details on impervious areas.) Also,bare soils will be immediately protected 9 this rainfall occurs during the day and soil in the drawing. An embankment at 118'elev.
Pe disturbing work volt need to stop during h hernp netting to help hold the mulch inplace and to prevent slides and
is time. lies in the upper mid section of the property. soll lion from taking place during heavy rainfall which can be as much
Auto pond siting: Bottom length x bottom width=134.17 x 134.12=17,990 ft. 5. Stabilize Soils: Response: All exposed soils especially on sloped embankments shall b. Description of existing vegetation: A 300'
g sq• as 8 inches in a 24 hr period for the 100 year rtttMll.
Actual pond sizing:98'x 198'=19,400 ft.>17,990 ft. r d OK be Protected by hydroseeding and/ 0'wide
or mulching to prevent soil erosion and sides on the long x 2de greenbelt consisting of deciduous
p (� ) steep embanli ients. trees will be preserved running from east to west
6. Protect slopes: Response: Apply hydroseeding,mulching,and/or visqugen held inplace as shown in the drawing.
CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN CHECKLIST with sandbags to help protect the slopes along the embankments especially during periods
(Reference: August 2001 Stormvater Management Manual for Western Wasshing6lyj of continuous rainfall,re., 1"or greater of rainfall in a 24 hour period. EROSION AND SEDIMENT CONTROL PLAN
7. Protect Drain Inlets: Response: Currently there are no drain inlets or catchbasins on the 'Ct4 p. ,4�� for Peninsula Truss Company,1980 Old Belfair Hwy
site to protect. 4`� "q •�� y Belfair,WA(Parcel#12317-1- 0060 „
1 a. Descritbe how each ofof helConstruction troSWPPP elements has been addressed 8 Stabilize Channels and Outlets: Response: An existing sedimentation ponds and drainage �C ' �F WgS �
ditch swales prevent surface water runoff from flowing directly into the Union River. �l' '9 Prepared for: Chet and Debbie Loudin
through the Construction SWPPP Answer: Refer to the following 12 elements.. 9, Control Pollutants: Response: Construction equipment shall be i G'� P.O.Box 2326
b. Identify the type aril location of Best Management Practices used to satisfy the sPo eq pme inspected for any ofl or O
required element. Answer: Refer to the detailed diagram above the type and hydraulic leaks and be properly maintained prior to arrival on site Belfair,WA98528
locations of the applicable BMPs. 10, Control De-Watering: Response: De-watering is not required since the groundwater table 380 27&7422
c. Written justification identifying the reason an element is not appicable to the proposal. is located below the bottom of the catchbasins. �,. Preparedti�: Morta Engineering and Testing
11, Maintain BMPs: Response: Hydroseeding and mulching will be maintained especially 1
Answer:Refer to the following 12 elements. P.O.Box 250,Ocean Shores,WA 98569
durft periods of heavy extended rainfall periods. ' 30758 J (800)590-0958,(360)289-9682 fax
12 Manage the Project: Response: The owner will be responsible for managing this project O,c� �%fS(6R�
and ensuring that the Construction Stormwater Pollution Prevention Plan is properly and rS (j
thorou hl im ented per this construction SWPPP `sJOIYAL ' Sept.7,2004 Designed by: SPM J Sheet 1 cis