HomeMy WebLinkAboutStorm Drainage Permit - PLN General - 1/24/2012 d
THE UNION RIVER ESTUARY RESTORATION PROJECT
MASON COUNTY PERMITS
THE STORM DRAINAGE PERMIT
1VED, SUBMITTED 1-24-12
MAR 2 3 2012
426 W. CEDAR ST. PREPARED BY:
Hood Canal Salmon Enhancement Group
PO 2169 Belfair, WA 98528
Contact: Neil Werner
Phone: 360 275 — 0373
WITH THE ASSISTANCE OF:
ESA Inc.
210 NE Cherokee Beach Road
Belfair, WA 98528
Contact: Pat McCullough, PE
Telephone: 360- 275-7384
Mason County
Construction Stormwater Pollution Plan Submittal Checklist
Project Name: UNION RIVER ESTUARY RESTORATION
Parcel#'s 12332-50-00026, 87, 89, 88,90
County Project No.: O�A 2Ol Z — 0000's—
Author of Report:Pat McCullough,PE
Minimum Requirements of the DOE 2005 Stormwater Manual
The Stormwater checklist identifies the minimum requirements of the DOE 2005 Stormwater Manual.
The Checklist is intended to identify the locations within the plan that addresses the minimum
requirements.Mason County will not perform a technical evaluation of the submittal.Rather,the
checklist provides a guide to allow Mason County to review the submittal and determine if the applicant
has addressed the minimum features that make up a Stormwater plan.
It is incumbent upon the applicant and his/her engineer to fulfill all the applicable requirements of the
2005 Stormwater Plan as it relates to the proposed proiect.Review by Mason Countv is intended to
determine if the plan has addressed the minimum requirements.Applicant's engineer shall be responsible
for the technical accuracy of the submitted Stormwater plan.
During construction of the proiect,the stormwater plan engineer of record or his/her authorized
representative shall inspect the site to ensure the stormwater plan is being implemented as designed.Upon
completion of the proiect,the engineer or his authorized representative shall be required to certify that the
stormwater plan has been implemented as designed.
-z� Failure to meet the minimum requirements could result in delay or rejection of the application until the
N deficiencies are corrected.
Q:
Section I- Construction SWPPP Narrative
1. Construction Stormwater Pollution Prevention Elements
�7. tea.Describe how each of the Construction Stormwater Pollution Prevention Element has been addressed
d through the Construction SWPPP. SEE SWPPP REPORT
b.Identify the type and location of BMPs used to satisfy the required element.
c.Written justification identifying the reason an element is not applicable to the proposal.
12 Required Elements-Construction Stormwater Pollution Prevention Plan
l.Mark Clearing Limits, See Required Element#1 —Page 3
2.Establish Construction Access, See Sheet 18 of the plans and Element#2 Page 3
3.Control Flow Rates, See page/paragraph NA
4.Install Sediment Controls: See Sheet 18 of the Plans and Erosion and Sediment Control Notes and Element
#4 on Page 4 of the SWPPP.
5.Stabilize Soils, See page/paragraph See Sheet 18 of the Plans and Erosion and Sediment Control Notes and
Element#5 on Page 5 of the SWPPP
1ACommunity DevelopmentTAOSTORMWATER 1 of Updated May 20,2009
5
6.Protect Slopes. See page/paragrath: See Note 5 Minimum Erosion and Sediment Control Methods-Sheet
18 of the plans and Element#6,Page 5 of the SWPPP.
7.Protect Drain Inlets, See page/paragraph NA
8.Stabilize Channels and Outlets, See page/paragraph: See Note 5 Minimum Erosion and Sediment Control
Methods-Sheet 18 of the plans Note#1.
9.Control Pollutants, See page/paragraph See Note13 Minimum Erosion and Sediment Control Methods-
Sheet 18 of the plans—Element#9 Page 5 of SWPPP.
1 O.Control De-Watering, See page/paragraph See Note 12- Minimum Erosion and Sediment Control
Methods-Sheet 18 of the plans and Element#10,Page 6 of SWPPP.
I I.Maintain BMPs, See page/paragraph See Note 14 Minimum Erosion and Sediment Control Methods-
Sheet 18 of the plans and Element#12,Page 6 of SWPPP.
12.Manage the Project, See page/paragraph See Notes 1 through 7, General Erosion and Sediment Control
Notes, Sheet 18 of the plans and Element#12 of the SWPPP.
2. Project Description
_a.Total project area. 54 Acres and 235,224 Sq.Ft.
_b.Total proposed impervious area. 0 Acres
_c.Total proposed are to be disturbed, included off-site borrow and fill areas.
Acres 54 Sq.Ft. 235,224 Sq.Ft.
_d.Total volumes of proposed cut and fill. Cubic Yards=59,000
3. Existing Site Conditions
a.Description of the existing topography. See FIGURE 2: Site Topography URER Drainage Report Page 3
b.Description of the existing vegetation.The Entire Site is Farmland—Hay Fields. See also—Soils Report
c.Description of the existing drainage. See page/paragraph See Figures 4—page 5 and Figure 7—Page 12 of
the URER Drainage Report.
4. Adjacent Areas
I.Description of adjacent areas that may be affected b the site dis
turbance
_ P J Y Y
_a. Streams, See page/paragraph—NA—See the aerial image on the cover sheet of the URER Drainage
Report
_b. Lakes, See page/paragraph-None
_c. Wetlands, See page/paragraph See Sheet 8 of the plans and Page 10 of the URER Drainage Report.
_d.Residential Areas, See page/paragraph—None
_e.Roads, See page/paragraph—Only Roessel Road—A private road which will be overlaid with 2"of
asphalt when the project has been completed to restore it to it's present condition.
_f. Other, See page/paragraph—This is an estuary restoration project—see the project description in
the SWPPP.
_11.Description of the downstream drainage path leading from the site to the receiving body of water.
The project drains directly to Hood Canal.There is no downstream drainage._
l
5. Critical Areas
—a.Description of critical areas that are on or adjacent to the site.
The Union River—See the Project Description—Page 2 of the SWPPP.
_b.Description of special requirements for working in or near critical areas.
This is a estuary restoration project.
IACommunity DevelopmentTAOSTORMWATER 2 of 5 Updated May 20,2009
6.Soils
Description of on-site soils.
_a. Soil name(s): See Accompanying Soils Report
_b. Soil mapping unit: See Accompanying Soils Report
c.Erodibility: See Accompanying Soils Report
d.Settleability: See Accompanying Soils Report
e.Permeability: See Accompanying Soils Report_
f.Depth: See Accompanying Soils Report_
g.Texture: See Accompanying Soils Report
7. Erosion Problem Areas
_Description of potential erosion problems on site.None Expected—This is a flat site.
8.Construction Phasing
a.Construction sequence, See Element 4 Page 4 and Element 8 Page 5.
b.Construction phasing(if proposed),None Planned.
9. Construction Schedule
I.Provide a proposed construction schedule, See Element 4 Page 4 and Element 8 Page 5.
II. Wet Season Construction Activities
a.Proposed wet season construction activities,None are planned.
b. Proposed wet season construction restraints for environmentally sensitive/critical areas. See Note
1 Minimum Erosion and Sediment Control Methods-Sheet 18 of the plans._
10.Engineering Calculations
Provide Design Calculations. SEE URER DRAINAGE REPORT
_a. Sediment Ponds/Traps,-NA
b.Diversions:NA
_c.Waterways -SEE URER DRAINAGE REPORT
_d.Runoff/Stormwater Detention Calculations, SEE URER DRAINAGE REPORT
11.Operations and Maintenance.
_An operation and maintenance schedule shall be provided for all proposed stormwater facilities and
BMPs,and the party(or parties)responsible for maintenance and operation shall be identified.An
operation and maintenance(O&M)Declaration of Covenant will be required to cover all privately-,
owned and maintained stormwater facilities. O&M Declaration of Covenant forms are available at
the Mason County Permit Assistance Center,426 W.Cedar Street,Shelton,WA 98584.The
proponent shall record a copy of the completed Declaration with the Mason County Auditors'office.
A cony of the recorded document must be submitted to the Permit Assistance Center together with
this completed Checklist. See page/paragraph NA
IACommunity Deve!opment\PAC\STORMWATER 3of5 Updated May 20,2009
`
Section II-Erosion and Sediment Control Plans
1. General
—a.Vicinity Map, SHEET NO. 1
—b.Clearing and Grading Approval Block, SHEETS NO. 8 AND 18
—c.Erosion and Sediment Control Notes, SHEET NO. 18
2.Site Plan—SEE ATTACHED'/:SIZE PLAN SHEETS 1,2 AND 8.
—a.Legal description of subject property
SEE ATTACHED.
b.North Arrow
—c.Indicate boundaries of existing vegetations,e.g.tree lines,pasture areas,etc.
—d.Identify and label areas of potential erosion problems, See page/paragraph _
—e.Identify any on-site or adjacent surface waters,critical areas and associated buffers
_f.Identify FEMA base flood boundaries and Shoreline Management boundaries(if applicable), See
page/paragraph
—g. Show existing and proposed contours
—h.Indicate drainage basins and direction of flow for individual drainage areas
_i.Label final grade contours and identify developed condition drainage basins
rj. Delineate areas that are to be cleared and graded
—k. Show all cut and fill slopes indicating top and bottom of slope catch lines
3.Conveyance Systems—SHEET 10 OF PLAN SET
_a.Designate locations for swales,interceptor trenches,or ditches
_b. Show all temporary and permanent drainage pipes,ditches,or cut-off trenches required for erosion
and sediment control
_c.Provide minimum slope and cover for all temporary pipes or call out pipe inverts
—d. Show grades,dimensions,and direction of flow in all ditches, swales,culverts,and pipes
_e.Provide details for bypassing off-site runoff around disturbed areas
—f.Indicate locations and outlets of any dewatering systems
4.Location of Detention BMPs
_a. Identify location of detention BMPs.
5.Erosion and Sediment Control Facilities
—a. Show the locations of sediment trap(s),pond(s),and pipe structures.
—b.Dimension pond berm widths and inside and outside pond slopes.
—c.Indicate the trap/pond storage required and the depth, length,and width dimensions.
—d.Provide typical section views through pond and outlet structure.
1 ACommunity DevelopmentT AOSTORMWATER 4of5 Updated May 20,2009
e.Provide typical details of gravel cone and standpipe,and/or other filtering devices.
_f.Detail stabilization techniques for outlet/inlet.
_g.Detail control/restrictor device location and details.
_h. Specify mulch and/or recommended cover of berms and slopes.
_i.Provide rock specifications and detail for rock check dams.
_j. Specify spacing for rock check dams as required.
_k.Provide front and side sections of typical rock check dams.
_ 1. Indicate the locations and provide details and specifications for silt fabric.
_m. Locate the construction entrance and provide a detail.
6.Detailed Drawings: SEE Y2 SIZE PLAN SET
a. Any structural practices used that are not referenced in the Ecology Manual should be explained and
illustrated with detailed drawings.
7. Other Pollutant BMPs: SEE SHEET 18 OF PLAN SET.
a. Indicate on the site plan the location of BMPs to be used for the control of pollutants other than
sediment,e.g.concrete wash water.
8.Monitoring Locations: TO BE DETERMINED DURING CONSTRUTION.
a. Indicate on the site plan the water quality sampling locations to be used for monitoring water quality
on the construction site,if applicable.
I certify that the stonmwater plan submitted for this project fulfills the applicable provisions of the 2005
DOE Stormwater Manual.
'CC ,� I
Engineer' �% Date 2
1i�'91
Applicant �'Vp Date
,�' /
SlOPJAL���'
Place eng.stamp and sign/date above.
IACommunity Development\PAC\STORMWATER Updated May 20,2009
5.of 5
d
Construction
Storm Water Pollution Prevention Plan (SWPPP)
For the
Union River Estuary Restoration Project
Updated June 2, 2012
1 �
Stormwater Pollution Prevention Plan (SWPPP) —
UNION RIVER ESTUARY RESTORATION PROJECT
Project Description
Project Location
The project is located near Belfair, Washington in Mason County (NW Y4, Sec.
32, TWN 23 N, R 1 W, WM in the town of Belfair on Roessel Road (a private
road). (Estuary Restoration) 123325000090 - (Soil Disposal Site and Storm Water
Storage) 123325000087, 123325000089, 123325000088, 123325000026.
Project Description
The Union River Estuary Restoration project is a habitat restoration project based
on the design funded by the SRFB in 2010 (SRFB Project No. 11-1348). The
Union River is identified as a tier 1 priority watershed (S H R S, 2004) and this
habitat restoration project is identified as a priority action. It is located at the
mouth of the Union River in Mason County adjacent to Belfair and represents
over 23% of the original Union/Lynch Cove Estuary. The entire 90 acres on
which the restoration site and soil disposal sites are located is drained by
man-made farm ditches that drain to a 24 inch culvert the crosses under
the existing dike and drains into the Union River. The culvert has a tidal
flap gate on the end to prevent sea water from entering the site.
Note: The Union River is a 303d listed river with the contaminant being
fecal coliform. The property on which this project is being constructed has
never been identified as source of the fecal coliform found in the Union
River. [ajsl]
The purpose of this project is to restore the estuary and tidal function to over 29
acres by breaching the existing dike in two locations, regrading to elevations
similar to adjacent marsh, and accommodating stormwater drainage. The
estuarine habitat is designed to replicate adjacent conditions of high salt marsh
with tidal channels. This type of habitat is valuable to juvenile Hood Canal
summer chum and Puget Sound Chinook (both federally listed) as well as Coho
and cutthroat trout.
The planning, design, and construction phase of the project began with the
establishment of a project stakeholder's committee that included most of the
agencies and surrounding property owners who had a direct interest in the
project. The project stakeholder's committee was given the majority vote on the
adoption of the final project design alternatives. Four informational and
community input meetings were held as the development of the project design
proceeded through the alternative development and analysis phase.
21
i
Thirteen alternatives were developed and analyzed. Extensive soils, wetland,
hydro geological, archeological, topographic, and other technical data was
collected and analyzed. Alternative 12 was adopted to carry on to final design.
Alternative 12 included:
1. The removal of 400 feet of the existing dike and replacing it with a six foot
wide precast concrete pedestrian structure to maintain pedestrian access
along the existing trail. The 400 foot of opening in the existing dike
consisted of a 300 foot long southern opening and 100 foot long northern
opening. The width of the proposed openings in the existing dike was a
compromise between project cost and providing an opening that would be
sufficient to restore the natural processes in the restored estuary.
2. The restoration of 29 acres for low, medium, high marsh estuarine habitat.
The project will remove 26,715 cubic yards of soil that will be stripped from
the estuary site to remove the existing grasses and grade the site to drain
to the proposed distributary channels. Approximately 20,000 cubic yards
of the soil will be taken over to the east side of Roessel Road and
disposed of on 10.8 acres of the PNSC property. Approximately 6,500
cubic yards of the soil stripped from the estuary restoration site will be
used as top soil on the proposed setback dike that is needed to prevent
the flooding of adjoining lands during the high tides. .
3. The restoration and construction of 9,050 lineal feet of tidal and
distributary channels. The distributary channels are the primary feeding
grounds for the young salmon fry that will enter the estuary from the Union
River and Hood Canal.
The project is also designed to prevent flooding of the surrounding agricultural
property. Over 4,735 feet of existing drainage ditches on the Pacific Northwest
Salmon Center property will be deepened and widened to store and treat
between 9 and 12.5 acre feet of storm water runoff from the surrounding
properties and the town of Belfair during high tide. Approximately 26,000 cubic
yards of soil will be removed from the existing farm drainage ditches. This soil will
be unsuitable for agricultural use and will be used to construct the proposed
setback dike and fill the existing perimeter drainage ditches on the restoration
site.
The Mason Conservation District (Ron Cummings) has prepared a planting plan
and a farm plan for the setback dike, the renovated drainage ditches, and the
PNSC farm fields. 4.1 acres of the setback dike slopes and 3.75 acres of the
drainage ditch slopes will be planted with trees, shrubs and cover grasses to
prevent erosion. 10.8 acres of the PNSC fields used for soil disposal will be
planted winter rye to prevent erosion and provide a cover crop until the following
spring tilling. The renovated farm drainage ditches have been designed to retain
approximately six inches of water so as to promote wetland plant growth and
habitat. It is estimated that the bottom of the farm drainage ditches will nurture
3 �
approximately 2.25 acres of wetland habitat. The plantings along the 4:1 side
slopes of the drainage ditches will provide shade and wildlife habitat.
We have included the MCD farm plan as an appendix to this SWPPP. Note that
animal husbandry is practiced PNSC property. A small herd of Alpaca exists on
the property. Their fur is harvested and they are used for a petting zoo.
The PNSC is currently in the process of revising the Alpaca water supply from a
open pond to a trough. The open pond will be fenced to prevent animals from
entering the pond. These improvements will be completed by July 1, 2012.
Animal husbandry does not currently take place, or is planned, for the areas of
the PNSC property where the soil disposal will take place.
The total cost of the project is estimated to be $1,900,000. The planned funding
sources for the project include $600,000 from WDFW, $300,000 from the SRFB,
and $1,000,000 from Coastal Wetlands. Construction is planned to start in the
spring and summer of 2012.
We have included a several project description image below to further clarify the
project scope and description. Two Union River Estuary Restoration 75% design
drawings have been included with this SWPP Plan that further describes the
project and set forth pollution control requirements.
,e4 1Wr`�'•q[':+vl,-_.{.t+6 °'r A .. �jp u.�; y�.., ...
__ ,� •: --!mow
w
t . ''4w Ii
Figure 1 : Aerial image of the site looking north.
41
I
r
Preferred`
Alternative 100' LONG X G'WIDE
PEDESTRIAN BRIDGE
(Alternative 12) REMOVE 100'Of
LEVEE
r
c� Features:
N300' southern opening and 100'
M northern opening along the f, -
existing (like. 6 INS
D T NB r-
C oncrete bridge to span dike
NEW TIDAL
cD openings to retain the trail in the i CHANNELS
o Same location.
v 18B4 T SHEET
AR H NDARI
i
� S BOU
Site grading is limited to the tidal!
C�/,•s e t
o channel excavation and drainage l TOP A K BERM
and removal of the topsoil. Borrov,,
�-�
ditches vJ11 be filled with Some of REMOVE APPR07C RECONSTRUCT
the excavated material E�grT OF THE
M�iG LEVEE> i \� ' '
HISTORIC TIDAL
O a EMBAYMENT AND
C DISTRIBUTARY
CHANNEL
Additional excavated material will be used to construct the setback dike (with an additional trail).
Excess spoils will be deposited on the PNWSC farm fields for beneficial re-use.
r,
GRADING PLAN
ti \
After preparation
(plow & disc), the site
F.
1 will be graded to drain
c y Y toward the southern
m "f _ � - opening and create
e�
tidal channels.
CD
Cn
O z .�o .. r. +.y ri w +�ra a��. •
This work will be done
m before the dike
CD
excavation.
�+. rt r ♦.raw
V�V ti w Y y/ r� y1 Y Y 71 4I
�! d tiw y1 r Y�1Y i•
//ww -r ♦ ri it v
y CD ' S .^^.ice._! � ►N
r
Marsh Compositioii
After Restoration
4 % Tidal channel
G) 10 % Low Marsh
21% Low-Med Marsh
� 55% High Marsh A r
(CD
Similar to surrounding
marsh sites in Lynch
Cove
CD
a w ~ s
(Q
LOW WATER LOW MARSH MEDIUM MARSH HIGH MARSH
SALT TOLERATE UPLAND
N
UNION RIVER ESTUARY RESTORATION
ENGINEERING FEASIBILITY STUDY
ALTRERNATIVE CONCEPT 2
MARSH TYPE ANALYSIS
SCALE: 1'=3W
v
b
sv
vo
c�
SETBACK DIKE CROSS-SECTION
r HEIGHT VARIES
1 f f -1 4-5 FT
I MAW
EXISTING GROUND
PROPOSED SETBACK DIKE ANDTRAII
FIGURE 5: Setback Dike Cross Section
Current watersheds
woKA
and stormwater with , ► r:
drainage toward the M ',,.'
WDFW property. - �„A.
JW,.r;, '
IntilO _.. i
At high tide, the ' j sV{aLYRV
restored estuary site - X COWDRAMA"WON N
MEA-MACM
\-_W76?IIAtIf111►d1D
would no longer store ,.
i
.-
runoff l would back
a - -
up into the PNWSC
farm fields. A ��
stormwater storage '
solution is part of the
design proposal. a
FIGURE 6- EXISTING STORM WATER FLOW AND SOURCES
8 1 P a g e
wwA&Lz•TrWot
- sorralrsct
....vFRrn a fwlev
CREEK TO 0MAV,3�
� a 2�•CUlVl7tTs
e
To store the runoff and
stormwater f rom 'f ,o
uplands on storm events -�
at high tide the existing IlvgpEYRo.
farm drainage ditches at ,
PNWSC will be
excavated to be wider MCNEW
and deeper. E)OAG�N o:�,eprN1O"°I`
KMRL WATER QfORAD&AREA 'r •' --' 1
REQUIRED DURING NIGH 71DEG.AREA ^Llt
bV{i 3t01{ 1G/U;A!�f.LT D�67011y lr^ \
ORA:N RUNOFF BE�M/fEN gEyAT1ON ^���� !a
• ).Y ANO IC S'IN+VD/�CA)11Y) ♦ l+f�. 'f�♦
EXCAVATFO AREA APMMX l 5 ♦• S
10 acre feet of storage needed= ACRER
LS.SUU[Yexcavation
FIGURE 7: PROPOSED STORM WATER FLOW AND STORAGE PLAN
91
FIR
C> *o
1 Q /
r
Mom DRA
v 16.0 }. ~
e.�wpfEs.1R1�Cr _
i 1 i S 19 ! 4 # ! ! S
OIL D AREA*2 i
�1''
-f IY
40
O
O 1
UNION RIVER ESTUARY RESTORATION
ENGINEERING FEASIBILITY STUDY
PNSC SOIL DISPOSAL SITE GRADING
AND STORM WATER STORAGE PLAN
SCALE: 1"= 200'
FIGURE 8: SOIL DISPOSAL SITE GRADING AND STORM WATER STORAGE
PLAN
101
FARM TRAIL SYSTEM
CONNECTS TO THELER TRAIL t,
li
U it
3 — �
J, I 00 00 00;b• ORCHARD
orcDE
o ER
FARM PLOT
FARM PLOT__ __ l, •` h yi. OO �O.E
FARM PLOT
FARM PLOT �l \ ��•� , C 0 ORCHARD
FARM PLOT -� �—_ - �..�. . { 500 FARM PLOT „.
FARM PLOT "' OOO OOO
OPEN
ALPACA DEMONSTRATION AREA \ �7 ' SPACE' �O C C C o c- E'.....
Ew57NGDRAiNAGEDFTCHTOREMAJN \ / C�COO
NEW FARM PL
CDOT N `
\\� ,` `� +•. :a. I J17 !(� APACE �OOOOOO
r Ic
j;` • 4 �// LEGEND
/, ff,.-�•^r' - � �— � C ADMINISTRATIVE OFFICES
eA` . _ - _ WATER QUALITY LAB
30,BARN;MULTI•USE BUILDING
CONNEcrIONWrcl_ .•i J'•'•- -� 3�,T C CARETAKER RESIDENCE g�
FARN TRAIL SPERM
P J it
�I •. �„�! fi �. /. C',GREENHOUSESEXIIIIM TRAIL
8_
TOREEwN WDFW ._ '.; f�,.•�' ��r r��, ,l: ��9yEEe
F•�- •�'`'�?:. ,.' ••TRAILS USE EXISTING DITCH CROSSING ira
PROPERTY
±
k
Imp
TO ROM
mum
NOESSELROM 1�
x•
` RDESEEL ROAD
Com
�ro the ,farm at Waters Edge
Home of the Pacific Northwest,SatnimCentemrdtht9[oodCandsadnm EnF=CementGrmT
FIGURE 9: THE PNSC FARM PLAN
Required Elements
Element #1 Mark Clearing Limits
Prior to beginning earth disturbing activities, including clearing and grading, all
clearing limits, sensitive areas, trees, and drainage courses will be clearly
marked to prevent damage and offsite impacts. The project engineer will mark
clearing and grubbing limits.
Element #2 Establish Construction Access
Construction vehicle access will be from Roessel Road — a private roadway.
Temporary construction access roadways — see Figure 4: Sheet 18 Erosion
Control Plan at the end of this document—will be constructed to facilitate the
hauling of excavated materials throughout the site. The temporary access
roadways will be removed when construction has been completed.
Access points will be stabilized with quarry spalls or crushed rock.
Vehicles that are simply returning to the excavation area via the haul route will
not be required to wash wheels or tires.
Element # 3 Detain Flows
The project does not involve the creation of any impervious surfaces.
Consequently, no changes in volume, velocity or peak flow rate are expected.
Element #4 Install Sediment Controls
The entire restoration and soil disposal sites are pasture lands covered with
grasses and transversed with drainage ditches. Construction sequencing to
control sediment will be:
Construction Sequencing to Control Erosion:
August 6th to August 20th: Clear (no grubbing) areas around the existing farm
ditches on the PNSC Property and construct access roadways. Use planks on
geotextile for the temporary access roadways across the existing wetlands.
August 20th to October 1, 2012: Excavate the farm ditches according to plan
grade and cross section. Use approximately 16,500 cubic yards of material to
construct the base of the setback dike. Haul approximately 10,000 cubic yards of
the material into position to fill the existing borrow ditches the following summer.
Begin the excavation of the center embayment channel on the restoration site — if
time allows. Install the culverts in the setback dike.
121
October 1st to October 15th, 2012: Excavate approximately 3,000 cubic yards for
top soil from the estuary restoration area and cover the setback dike in
preparation for planting. Install the new culverts under Roessel Road.
October 15th to November 1st, 2012: Construct trail walking path using 5/8" minus
crushed rock. Prepare the project of over wintering.
November 1 st to December 1 st, 2012: Cover the exposed soils on the setback
dike and the drainage ditch slopes with six inches of hay mulch and plant a tree
or shrub on 6 foot centers in accordance with the planting plan. Cover the
exposed soils to be used to fill the levee borrow ditches with plastic and sand
bags to prevent erosion over the winter.
February 15th to May 15, 2013: Close the existing Theler Trail. Drive the piling for
the new pedestrian bridges.
May 151h to August 15th 2013: Complete grading of the estuary restoration site.
Construct the main channels and the distributary channel first and then grade the
site. Rototill the areas to be graded sequentially in 5 acre tracts so as to not have
too much bare soil exposed during the grading operation. Haul approximately
25,000 cubic yards of the top soils from the estuary site over to the PNSC soil
disposal site. Use the soils staged along the borrow ditches to fill the southeast
and northwest levee borrow ditches. Build the bridge caps and place the bridge
girders.
August 15th to September 15th 2013: Install a PORTADAM type facility to prevent
tidal flooding along the westerly and northerly sides of the existing levee where
the pedestrian bridges are to be built. Excavate the new channel out to the Union
River. Install the bridge railings and open the bridge back up to pedestrian traffic
by September 15th, 2013.
September 1 st to September 15th.2013: Install the large wooding debris in the
new embayment and distributary channels.
September 15th to November 1st: Plant the soil disposal areas with Winter Rye to
prevent over winter erosion.
The existing levees will be left in place until estuary grading has been completed.
The area of the site located below MHHW and outside the levees will be
excavated when tidal waters are not present. — I.e. in the dry — utilizing periods of
low tides and/or temporary dams. .
A temporary erosion control and sedimentation control will be installed as
construction proceeds as described on the drawings. See FIGURE 9.
13 �
Element #5 Stabilize soils
See accompanying soils report for soil types and soil log results.
All exposed and un-worked soils will be stabilized. The soils on the setback dike
will be stabilized using six inches thick straw mulch. The soils on the PNSC farm
fields will be stabilized by planning crop of winter rye. The slopes on the drainage
ditches will be planted during September and October of 2012.
Element #6 Protect Slopes
No storm runoff is expected on this site during construction.
Element #7 Protect Drain Inlets
There are no drain inlets on the property.
Element #8: Construction Schedule:
1. Complete plan review and contract set by June 11th 2012.
2. Plan review 3 weeks.
3. Advertise Phase 1 for bids — July 2, 2012
4. Open Bids July 27th 2012
5. Award Contract August 3, 2012
6. Start Work August 7, 2012
7. End Season 1 excavation by October 151h, 2012
8. Bid pedestrian bridges by December 1, 2012
9. Close the Theler Trail and start the bridge piling by February 1, 2013
10.Start Season 2 excavation - May 15, 2013 depending on the weather.
11. Complete Bridges September 15th 2013
12.Open Theler Trail September 21 St, 2013
13.Complete all earth work by September 15, 2013
14.Complete LWD placement by September 15, 2013
15. Finish Project and Plant by December 1 , 2013
16. Final project with grant agencies by March 1, 2014
Element #9 Control Pollution
Repair and maintenance of heavy equipment and vehicles will commonly occur
offsite. Emergency repairs will take all precautions practicable to prevent the
discharge or spillage of pollutants to the ground.
The Contractor will be required to have Spill Containment Kits on the
construction site
141
Element #10 Control De-Watering
The "sugar dike" borrow trenches and other ditches that are to be filled with soil
will be pumped out prior to placement of fill material. The clean water in the
borrow trenches will be pumped over the existing dike into Hood Canal.
Element #11 Maintain BMPs.
All temporary erosion and sediment control BMPs will be maintained and
repaired as needed to assure continued performance.
All temporary erosion and sediment controls will be removed once the area is
stabilized. Disturbed soil areas resulting from the removal of BMPs or vegetation
will be permanently stabilized.
Records of BMP maintenance and repair will held in the project file.
Element #12 Manage the Project
The owner will have full time construction inspection by ESA Inc. on this project.
The site construction inspectors will enforce the SWPPP.
The project will be managed in a manner to maximize the effectiveness of this
SWPPP. The selected contractor will be required to prepare a SWPP Plan have
a CESCL on site during construction to implement the SWPPP.
The excavation will occur in the `dry season' (May — Oct) to minimize the
likelihood of erosion.
A pre-construction conference will be held and SWPPP will be discussed at that
meeting...
The SWPPP will be kept up to date and modified as necessary.
151Page
f
FIGURE 1 —VICINITY MAP
/ Ll
m �� � GrYVlnunta,n -
2
N RIVER
ATERSHED
SQ.MILES e ccr �.
IVER
z 0Las MIL 9- G j
f
r
,m
a rl•i� � ..I FJ-
I
o OI R
o � Ile
122153100d W 122-51.000,W 122°49.000'W 122-47.000'W W0604122^44.000'W
16 Page
au
bn
ro 'w xr �R6-Dcr/0➢D/RDR y n�'h► u„ro"�^ o��::'°'.Q wD M w a
!� ]f1OLTI JJSt08d �e.w ow Dow r v�wro wv�n uae d/ \�_ ran Dwv DVfD w
s Tr Agf!l1ML�QIAl/MflB9181MM7W1 .a.w.�„, npt=Y ww ws NIAMS5 9
lnoxv71031'Odd NOIIW:fO1S.9d M-idn1S3 L gmu NOINII
�TO9.OL dD.1OA/rA1LY1MOliiY
wd. .. ON30ilOMel�1t AID s
• • + - ,. 037W 393O��1fI�V7MNYYMY31 �
., o OW3a! 1YL111�CffiigL3 Qt
f 13Rd1A >•IllAlel�l0/r7Y �
3319l31TOBlPAo 07e4AVLM3/pYN �
rDY.9IMNNW
+
Po
A2YhVIrI�iLauB arrwup u3wal9 i"�.,� , i 3��oNnaYw:�eww ra%ia � N
WdAWW W 7WJOUAOY'ln/A4'19o'19
3WLW/TWAbvnLs2cm AL7tlM3/3u"L -
7NUY9Y3730)VVIUW NLOWaNUn 4 1 ®p •ArLYa L N
AVApmQ#Vnw BNIL3A93U OL®POY
33TM1 TALL Mfuj9mddol22wmT v
4W/
NVUSMSd
7"W. Nvwrda l33lnBll vu7
71rN71YULNYWO40L32d NOfd3u 9 f }
30MWOLANKLLY3.•UM03OYWWTW
V3lyplj W(>9ypL3iR/3p
'IUx Y[1M1MfJ lx91a0133i7Y397n *U
AtlYTIl.937HAWNONn 3N1
µOU IIMU 23Apr3/M"W 1,g9.1')Ap V Z
�y3 °� 'nNYO oOo//OLM07d
m1At93tl OU CU S29gaXW 7OWW 3O1T9YW 01/YMr1
Q/1'ALAAUOZ#=OrNM1WN31L3W/A.3! `!' �\\ _ 1 } A1O71YvvpffAm ORV3P
Tex mvr OW 02OU Il 4WU W00.0 l �-\ 31L 01Yaroa a993Ot1
.WW2hBm Atl TWJOLOd-VUi _,O \ '\ - rc 9BN199o+o r971ro
/O93WYQ3e0/i30l iex LO3CnhI3u"1 4�/' dYV NLM/I llIIow Wum
s�al3rrnaltALols3a �
aw
I �\•\\ _ q ----wrulwltao NtmWR
3
NourrX)NO 7KU
Y�11'NDUYWLr3tl it,• 3n WYAtlMM ONCLO4
Armuameu,.oae 3u nt 7ahwn
OYI3 L3
3LL 7r1l1OON Y93610W rd 7B19A9 Yo/id�QL flyffaC/
I1(RI!Hr
-RYtlt OWLSOG 3NL aorkm OL 3&Rw Mvftfa 03d �" BhIIY� AWNI QIY3LYAYo97
Faroe nD�oNYs -
AOhNO AHYLf)87UIWC FILLliY1-�/ eg'W N�7 ' B
OLAbN"OP11AUSY W1x OW3Axx U9A8
3N1 OLANM/1G3®lOff3tl 3NL 9L�3riW 7919A9
TrIIL 9V LYOCi 71(39YL�Il O/dBDRR I11W Il3O3J
30MI lOOf rP9 Y O/Y LM9iO N1llO9 3aN1 OOn
F�1 j _ \ r »c p p•\ �roilT /XM Ir.O� \ L �noN eNUAa.Aro aeeAaNa of JDA Dra•+DeAL
rOP& NnR a�a.0OFV AAEAS- NMGTIE E
c t / �' •� rcraoanvne DENrEA aF nr veers- INrr TOR
kj G,
4 i
a DNpRINANO OPAKWEMU ANDSOFAD Thr
CLLVEMA r eMAA7MSC"OUrI LAMM B AAU 6R7S10 T7rE
`M,t;-1LDAq ^'^*:'�"'+ OT.AVATmaM3OU7'MIUKIts TO DRY
':A`V J.W""E SD"ENrAVAr8 FFP(W THE�'NAGE
k eovEDAYHPI wrah"NAe DNN• -Mmn Flnw TO ORADEANO
1�PWLO q Si1N'F TIIEf,Fr n SU9UNADE N UNAM
• mTwolrgw/ NsOp ;. _ WNUWQ471 ,� 4.aWEAD7TCTVPSO"7NTHADPEETIMIN NED DRG
Vuk 1kr=A err awa CAIP \� '— _�` V .; 'r, msc P4GR6NTY MDADVFR i FARM Fars
ANOSPREADRDV/rAnMP$OOL/a FAlFROMMR
'MPORrThr`�\ °\ �' - FDenNU u•UV C(nFNi N.AWSH a A4DE7WFHWFAIAWFELUSWTHROAc
O `I wErtANDaarEvarN.�• � _
gx,,QE T-ATLPA7 l ) I b \ I C SLVrn IGEOUIXTO DMrawMDRCN F:ELDS R
EW,is alma
- MRAA O M��`` r a Q GW?To O ro TTE FILDS TO MWAF.AREA
AAu rs eeAG FAAAmawlw o' a _ wa°rra Aororu nE earn ro Fr�ATIE Tr+ew•aA
nANrN GL
����� Vy 'yam-� 1.A t Fl W w lar OR MMFW AS D C1ED
E ��D / BY 1iF PIBC rAVFCTOA
ry
a � \i I�• w c a l I�-�' i �—1
F4� \ FOM4T>S Nf7UWs w
��
uj N y f
6• �1 '• Q� a r y s/YNEWT%VNDMAAM_M&WILSEUMDAs
m l+ b •4 / SOUAVAtE&OIa BES6.V-A/EAB THE Ftl1
�� � �j � L_ � A °�' � •r� 7+ Y �-�T• a _(_ soueDAArs wru eesrAlreomTNCFlan BY
T ENaN.FER.UD NUT FAL WTaoE
rW NEerAeEDeaurnAAEs
O S
D'i��
AApt J NtTIANOM:CAMGCWYs-PALUerANtF
KhQM NT-M"$ONALYaoxm-
c yi L s ,� � � -(�- `� T.TMYFAIAL THAN ARd neelAu
N a �` :N�.� SI 1f' �eFAAeE°av ANAwAuu we&DG Nor
(D 0 J° �� N •�/y� �'p� / ru wGuaEOAr�w
elmAene-PAL[XFR lsA p IF
SM DOPM&ARM GRADNG PLAN ORMP)w SCAIB
SNNL6- um gm SF--1—/s YNC:1'.IOY
�..) REMO FA A/EO DNANANN1A1L RON
6 Do NorF{AUE FILL M TM
V §$ 7:4�s�
Twn Soma AmcWo LIMLYrN�YFFffi,LIRI'/ STC14ADgV d�n,r.,a..Nrpr am aa� MvikiYAI SUIL DUSYU'SI.ANIV ` L el..J CI Are AlN oe.,.A.w...le.r !� + A.raa NArse/NTN/ua F.aw r.� (TO AVOID THE TSFfwND9 Di THH /` FARM FIELII3.1
00
�' a
CD
y „��pA��w�¢.p��1pp��
RAMI27 R RYr,NI��I'WPY Mp N01[[r M R-qR�I-R.iRA kY FK rr.N#Ir0�MfI1h�I rwR T 2-.
RAni r«a vu�Rs-�r ru ro lu.rc wru.aac,u w.tt��xora`.aiur.K '
orgigar¢m�v.ycryA�wq[pmru�Aa¢rr[arw.wrcoerRr��rpc�MgJw.swrus R'�A,e'��*"Q�'"`Wanaw�RSAnKK.ir..®rAuox �.W�v�".�.�.1'i�eo�ro^ru�mra.:.1%.eaam
Wl.-®W141VM fKONS 11d WYfAOIC1-I�bR11f411tlNM'-r s,W,e�� ��.�.nu�,a,aysu+o rr fir• .
V1rt.K®1a11n[NM T MM1 N'®�01N.IrOOr!Wl 41T,6 I1M®n[tf R Omani
��oa%a[�+rlRl'S w.Went omw. s•��•�•�••�•••'r .a tea'.,. roar w:Aa R eLum n uf�w n(mxc FaBr.BI x�R y niGw ruieNR or�e
iqi wi eaieo.wrAa rr u.iom a ___ 'r'[ 'i m�nr tmerr ac y< :/ ♦ Um a®onvrc w
aswm oc+Aa �Raa oaviurn'.i v�ru w � ♦ avwc NenFa
H %iln`3ts%m m"""ma..evar.v1Ofmr.tl1c�rM0m-r wrOw"�0iw r+�u°:.o:m ��o• ,•® ao�a r�.�[ '�t'� y. y�
��4yy, rR��Y 6 K O�av'a�[OMIOOC W�.�mcut TM r�Nw r""r�u�-..io
_wrM maul C vq_cr Ci u.R assay a,fo a vi.�oxr�`i.u�''r.=e+n9°�YO�'�'ru�ir R tit qns 5,
rv.io 'r�iiQnr wogR[,�.'r um auw�y�y clreo..noa,uo �e-i w N"�iro'm o"'°aw®r.ww"a�-R K es v`nn�. �^� ,ram y� i � •
-mx Yip wu I��O NBC��_el¢s,�iR RRMN YD a[e�rwYow s♦ � �
VA➢Cf,-M.MN'Q N06[Vm111�}F6a � ��~� ,rs-u��e ��y� ���`v?= � ��
M,x p+�[J �P9 w NwR Rwrs s
Y+ 6YPf vlU!?R A�NWAI[ Q f�f 4LR1 w®6 a iis-�[-Kicw~i a�i.s, :�-�— M d6 s/IIK
RiR Ra wrICMF. , rU1M[I 4COM MVMI[ ■Am11OWr10ra
1�.1 iR i►a r
l+� r4.N°"a,^" "wvise' '.aio'an11-Rn wa®°�"'ror" r"° nrl �..�,.7?• .
M u. ov. n�cn c rucnw� vio
role vnowc ar rvoK wNo+e oFtcm •.r s.R...0 rN�ry.�rm i O RYl R srrffi=mmyo v M rra norm.m f';.nA rY fHE OlMig DV.Q CW6TR 7M Ipore®MU STRAW NATUS
A Ea[KRlurwl art u�>�> c mamas r.w,l,w',U�4
srAaiON carlmucna DETAIL_ Q
wln s memsr-`o`'ir v r a+m a�aa v'-iw`IIwr ,mc FNTRNICE
covrlrrl.Awxw. >m+u'ab.INue m.ASIm m NN aow r[ IN,
rolanv usv[w�mrrlN�wNN:anac."aoa°Aw-a q90 o.R w^®d••••a•• DETAIL s
AIaIR'la E�NV1a6.em.IX 9IDL 9CIL R lrallE0.l44O�.R.11 a 1S'Jf Plf 4:N uiM1 OR
RI(�—I.fAKN Ms '� 'FI801Yf!1SRA=INF! Or`v 17 V KIY. KIR,u K w1POwd[uYC rRMn. n.W
M N/.NOrt n K INUYfAL v w� x� _____
�. VMRN.I[RAI m 1YS lags aagRYl R-i .E� 1
1.lNI/viWR¢A1pFyaPpl/O fIJu1lLLA■m1tM['f�F¢aagwl�NCrl�,1gN00.�tfiffNllY.�4a lOerRaMM�tngC0Fga 1R M/IY t 1
y yO� 9 11r Er61D NR KMM111p.F16N NCiO1Lt NiW[CMIroCI tCY Rn fI[-R® 1 IOYVp iIrO 'LLT:ANATE TFJIPORANV AC�E55'.tOAO�E-ML
��UN6T�I�YO OI�aIRW T�AWL OC RIAEO�T[Yr�fl R� P��L �4 r
W4E-E H�-'ORLTItTttYM�t�W Mlwlt aIRMLM m.KClgr 1 1
Ra NYoa c oaaw:MAim ro imla.RNm. lwro +- - _ ___ _Mole
'^ YNC,IOI M RCM r Wry Q mn-Krug auwM amu.ar L�� RmaR- u' OdI1RACm m 11!!_i PENCEMiHN
V J R/iRnAK MQ<Mf Y A �.
SLT F. WllN LT 1.A[Aa THE MIRE
70U1 TL W■Y4OTHE L- NK
0 �����`- « DETAIL T
' -' �. m'a.°Xm' r"'du:.'�'8'M WrawN amwcvl ws sao.no
ro1��r�,1 Wl1 Row¢N w wAwlar—t Ma smE W E As awww R'THE MO EM
{{��.r.�) �01�M0.11®m!v/GNMR OEVr aC.Yi�1110r A.MI 1[IMM K lIC
1ly� P q)IYgL II.YF-1 Iv1'e<va ry ill I M A rfN.Mr o 0U I—,
,
y �Ca�0 1 YOOf�C P9�K n. . -R Cif Kga N. /i•
��1�a�f0a mlT1N�rt G�-
(� AIR Au 6- e®1-man mnn..[nu■ ',' "'mil \
®�r rrN mLLm riRl lava v,alTl.Y ars wu c,wwon. �t
sr.c>®.M Iowa v revwlr wRw w mar awvacera wr xr c
aNUAm TQ no¢iS Res a frac rrr g1Y�f{t w®R lvii0loyAT[lucAnON M l[1PO N 9E
OahIC R�MirNNti4 i CIN{M�Or AM1 ty'l V0.0M�1BPORIRY 24
cN06"NIIE o w m K uA� \ _— 10= RE,C INZ CF flOfING OtE
----111 �,r C4 Act ro.Krr uA Ld A mM WF nOVE YL NAWt Mm5
'' J/ ROarAK OVER WUM AIEAE.M ARD
AT I IMP.ME AC Rw.
F�1 t�mrR O KlYIMn Oca 1XM.WG,O�LP1n+.c1n!6 OTa
�r mon T,ur m,,,v,fi>ra.m-,iC,a RN.c M.am"iR�Y
mVi.A,r1RY x1i D9 ai cWG CMAY.AT4 V KRl R slrn wNn J'
I'alWr�7 m01�YY lR M WO II 11b.LLGi'Mr1f 61dR mQL �� u � /'
Elem m W am°�°'u o"4arwm1O1a'°TIM NET
.Mall K A�nlaurf N1Al.i@aINC rt.,fAKq mrT/Ar]IV KOYq RA1am , "�
@ 1p0a ENn�T 0r1a a14H fla mC[CIl6,M MImMRY RMIi A ��
4/+'�~` •"�•••"` �--1�' leww /�J-'/�'`mil y yJ,f/ IFyi driay sEnnea Arrida avtwmmsvnauerl wa-ATm 1B
_ L/�/ L l Lw(d w AR/Ur M.I 1bN! MKW
xi sa CIwJ..i.w.v nO90N CON7ImL PLAN 1B
� aN.Ar er o" wcarl r'r Avn nw/ra-na
>y
UQ
CD
�ttF,STA 7,
6 L
6 y
6 �
Y�'� tR89 any
State of Washington
DEPARTMENT OF FISH AND WILDLIFE
Mailing Address: 600 Capitol Way N-Olympia,Washington 98501-1091 -(360)902-2200,TDD(360)902-2207
Main Office location:Natural Resources Building-1111 Washington Street SE-Olympia,WA
NOTICE OF FINAL DETERMINATION
PROJECT NAME: WDFW UNION RIVER ESTUARY RESTORATION
DATE ISSUED: November 1,2011
DATE FINAL: January 23,2012
SEPA NUMBER: 11-088
Under the State Environmental Policy Act(SEPA) and WAC 197-11-340(2), the Washington
Department of Fish and Wildlife's (WDFW) issued a
[X] Mitigated Determination of Nonsignificance (MDNS)
Additional Mitigation Measure based on comments received:
"No spoils from the project shall be disposed in wetlands east of the setback dike, in accordance
with local, state and federal regulations."
This threshold determination is hereby:
[XI Retained
Any comments received for this proposal are attached.
This document is a part of the official SEPA record; retain this with your original checklist and
determination.
Sincerely,
Bob Zeigler
SEPA/NEPA Coordinator
BZ:bz
I
UNION RIVER ESTUARY RESTORATION
DRAINAGE REPORT
PREPARED BY: Pat McCullough, PE
1- 22-12
' .:-.: _ .. ..... ram:._ . ... _...:...
Ell
.' • ..Ad' — - a
j � � s s"l%� a` F s r 4 t a s•
�a
J
at a �``S1�K'�1 �7," `t � • �' YNr' 'r�•�r —.
wz, �`- gs.`` a+ice x ,,t�,ti � �'� 1*�'!1 S .r 1 n rr• --
r
1LOWER"OOD—ALREST01
``' a4 # { • - LYNCH COVE SALT MARSH
�q'a ti PROPERTY AQUISITI
SCALE:1-200'
1. INTRODUCTION:
The analysis of the hydrology and storm water drainage storage and conveyance
for the Union River Estuary Restoration Project has been in process for last 18
months. Critical to the design of the restoration projet was the acceptance by the
owners of the Pacific Northwest Northwest Salmon Center property to store
storm water that is currently stored on the WDFW site on PNSC property during
high tide events. The WDFW property will be converted back into estuarine
habitat and will no longer be available to store storm water runoff from upland
properties. The following graphics, reports, addendums and other information
included with this report will give the reviewer a comprehensive understanding of
the proposed project and the drainage solutions that are proposed.
2. SITE LOCATION
The site is located near 600 Roessel Road in the town of Belfair. See site Figure
1 below and the aerial image on the cover.
,
R 1
C
-Snmbdtll -`^� L 6
122'S3.000'W 122 SI.000'W 122°49.000'W 122^47.000'W WGSB4122°44.000'W
FIGURE 1: SITE VICINITY MAP
ESA Inc.210 NE Cherokee Beach Road,Belfair,WA 98528
Page 2
3. SITE TOPOGRAPHY: The site is flat. See FIGURE 2 below
Nv
1 C i 125 ACitE8
t OF YVDFV
PROPEMY
�t
NOTA PART OF
T10 at
�\
° � CdvvERTID eACxrrIrTO -' �ti\
l
ESTUARINEWLfUTAT 9
V i
V 3 _
A
SITE TOPOGRAPHY @ MLLW
FIGURE 2: SITE TOPOGRAPHY MA
ESA Inc.210 NE Cherokee Beach Road,Belfair,WA 98528
Page 3
4. SITE AND WATERSHED SOILS
See FIGURE 3 and the soils report submitted under separate cover. The soils on
site are Class D soils. The soils in the upper watershed that drain to the site from
the town of Belfair are all Class A soils.
SECAONS 29, 31, AND 32 T 23 N, R 1 W, W.
1. T,
ara m[. •10 /
saAn.►rEs •21 2
1 1? 23 -
aanp
' 10 1 .12
�� e`""1 19 /
• 1 • 141 �
m S
DOUMARY \ . g
JACK
PROPOVY
EM37WoDRAKAW
dtAAY1F7�J m..m 'F��_ � � r���j�•
THEIER
WALJQ
NALJ01•
TRAI
TIDAL
HARSH
„� a
SCALE:I'-5W
FIGURE 3
PACIFIC NORTHWEST SALMON CENTER
AERIAL PHOTO AND SOIL PIT LOCATIONS
4. EXISTING WATERSHED CONDITIONS
The existing watershed topography and watersheds on the site and in the town
Belfair that drain to the site are shown in FIGURE 4 below.
ESA Inc.210 NE Cherokee Beach Road, Belfair,WA 98528
Page 4
«•ice; � t
,1,J • 4
•
_ I ,
1
'i
411,
Nip
{
j t .a J .y 4•ti 4�•4 M1� ��t ..
v 5K+
,n" ' �"I i �`ice.. X,�•y� '� i~ �r !",��,.��'�"'
}Vk ID+.k'�`hf6*f. �.y� .•�.'�.q F sit �{ r�'^ 'y ,` J+�` .4.{_"$:'fir,
iR r l � �,. M.f �.`i� �n,,.E°-� ti2'L'�?w.,3���`i.>a'�C.�,�•�. �'�� fit':`
�6w TiM �� r i �y Rtfi jo
r, q"rt ,3"��.y+��"►i� ti r��t�,,1 .'fir x ,^'
s i, Attestr x
woo
i�r� z��r4 f'+ � mob+ t f s.d r�w'+�y .�+°1'•{?�-�fiY V^ q�.v�
5. DECRIPTION OF THE PROPOSED PROJECT:
The Union River Estuary Restoration project is a habitat restoration project based
on the design funded by the SRFB in 2010. It is located at the mouth of the
Union River in Mason County adjacent to Belfair and represents over 23% of the
original Union/Lynch Cove Estuary.
A two year planning and design process, that included several meetings with the
project stakeholders committee, the community, and regulatory agencies resulted
in the evaluation of 13 design concept alternatives. The restoration alternative
approved by the project stakeholder committee, the land owners, and the
regulatory agencies is illustrated in Figures 5 and 6.
The purpose of this project is to improve water quality in Hood Canal and to
restore the estuary and tidal function to over 29 acres by breaching the existing
dike in two locations, re-grading to elevations similar to adjacent marsh, and
accommodating stormwater drainage. The estuarine habitat is designed to
replicate adjacent conditions of high salt marsh with tidal channels. This type of
habitat is valuable to juvenile Hood Canal summer chum and Puget Sound
Chinook (both federally listed) as well as Coho and cutthroat trout.
It is also designed to prevent flooding of surrounding agricultural property, while
accommodating continued recreational use of the existing trail system (IAC 1994)
with pile supported concrete walkways over the dike breaches. One 300 foot
breach and another 100 foot breach will allow daily tidal inundation and most
habitat forming processes to function and create maximum value for the scale of
the project. The project will provide 12.45 acre feet of storm water storage by
deepening and widening the existing drainage ditches on the PNSC property.
Land use changes have been documented (LFA, 2003, HC Summer Chum
Recovery plan 2005) with the Union River is identified as a Tier 1 priority
watershed S H R S, 2004) and this habitat restoration project identified as a
priority action.
Water Quality Benefits: It has been proven through seven years of intense
scientific monitoring and study that the Lower Hood Canal has abnormally high
concentrations of nitrates. The high concentrations of nitrates in Hood Canal
have caused excessive algae blooms and numerous fish kills. Estuaries are
natural nitrogen "sinks" during the growing seasons. Adding 29 acres of restored
estuary to the Lower Hood Canal will make a dramatic improvement in water
quality as well as improving fish habitat and propagation.
Job Creation: The total project cost for the project is estimated to be
$1,796,880. $1,505,983 will be spent on construction materials and labor and
$290,897 will be spent on professional services (consultants) and agency staff.
The project is primarily an earthmoving project so most of the costs will be in
ESA Inc.210 NE Cherokee Beach Road,Belfair,WA 98528
Page 6
1
labor and equipment. Additionally, the project can be completed by local
contractors which will be a great benefit to the community in and around Belfair-
a distressed community. The project will create 26,272 hours of labor and
equipment operating work, 1,300 hour of concrete fabrication work, and 3,500
hours of professional services and staff work. The project will occur over a 5
month period during the summer of 2012. In summary, the project will supply
36 people with work over a 5 month period during the 2012 summer work
season.
Readiness to Proceed: The project design drawings are 75% complete and out
for final review by agencies. Permitting is in progress and expected to be
completed by March 1, 2012. Our current project schedule calls for bid
advertisement by April 1, 2012. The land on which the project will be constructed
is owned by the WDFW and the HCSEG dba PNSC who are the project
sponsors. The project is ranked number 5 in priority by the HCCC. It has been
planned and designed over the last three years. An extensive community
involvement program has been completed and documented.
Project Funding: Approximately $1,900,000 has been committed to the project
by RCO, WDFW, and USFW. The project is fully funded and ready to go to
construction this spring.
6. STORMWATER STORAGE SITE ALTERNATIVES
During the concept development of the Union River Estuary Restoration Project
four alternative storm water storage altenatives areas were evaluated.
1. The construction of a 5 acre storm water storage pond on the Pacific
Northwest Salmon Center property: This alternative was not selected
because it consumed to much farmable land.
2. The construction of a 5 acre storm water storage pond on the south
easterly 12.5 acres of land owned by WDFW: This alternative was not
selected because of the potential environmental impact of grading and
disturbing 5 acres of forested wetland when there are other alternatives.
3. The use of the existing wetland and ponds on the Theler properties south
of the proposed restoration site: The existing ponds on the Theler property
did not have enough storage capacity to accommodate the required
additional 10 acre feet of storage.
4. Widening and deepening the existing drainage ditches on the Pacific
Northwest Salmon Center (PNSC) property: The alternative was selected
because, 1) It created the least disruption to the existing and proposed
uses of the PNSC property. 2) The widening and deepening of the existing
farm ditches is allowed under existing regulations. 3) It had the least
environmental impact of the four alternatives and the least cost.
ESA Inc.210 NE Cherokee Beach Road,Belfair,WA 98528
Page 7
The north and center farm drainage ditches will be widened from a bottom width
of 10 feet to 20 feet and the side slopes will be increased from a slope of 2:1 to
4:1. The proposed ditch side slopes will be planted with trees, shrubs, and
grasses. The east and most southerly farm ditches will be widened from 15' to a
25' — 50' variable ditch section. See FIGURES 6 and 7. The west and north
banks will constructed at a slope of 4:1 and planted. The east and south banks
will be constructed on a slope of 2:1. The plan and profiles of the drainage
ditches are shown in the 75% design drawings. The storage volume of the PNSC
farm ditches is shown in Table 1.
TABLE 1
UNION RIVER ESTUARY RESTORATION STORM DRA I NAG E STUDY
STORM DRAINAGE STO RAG E VOLU MES AVALIABLE IN THE PNSC FARM DITCHES BETWEEN ELEVATIONS 7A AND 10.5 NAV D 88 DATUM
DITCH ELEVATION SURFACE AREA AT DITCH DITCH STORAGE VOLUME PER TOTAL DITCH STORAGE VOLUME- COMMENTS
NAVD 88 DATUM ELEV.IN ACRE FEET INCREMENT-ACRE FEET ACRE FEET
7.00 2.00 DITCH BOTTOM
2.25 2.25
8.00 2.50
2.80 5.05
9.00 3.10
3.45 8.50
10.00 3.80
DESIGN STORAGE
3.95 12'45 VOLUME OF DITCHES
ROESSEL RD.
10.50 4.10 OVERTOP ELEVATION
4.30 16.75
11.00 4.50
ELEVATION OF FARM
4.80 21.55 FIELDS
12.00 5.10
ESA Inc.210 NE Cherokee Beach Road,Belfair,WA 98528
Page 8
39PIMTE IOVOI OPENk/O ANJA DOf PoOT NtOE - -
I'®E'i
SYSTEM ca ec dnTOE F*Waew7Tfm,wMAOn.rolT TTM/
D tlQF"M OVALTIDAL,NVF ANOA
1
-
apt
e � LMDnvldm �"To
datAwTTAArauTla. .
DANO Nu.ROAa
nroxv71E1NONM0PEMWANDAmrr WWN
AlDVADENMDM MpyC[aAMMMAO(I Mro
LRY7/E -
MCAVATEIIIN •I -
'n crAu/a1 ro AEPLKAT1 t7Mt % ' • -L _ A RaG►ODMMTIAMY
HORTOMNEONETRYANDWA:E q
cn
Ile 1,
SNEwctxvmr(IMMAP�gt
- FMiAN roeffr(A"V aOd of
p MIMf CAtMdwOd Op gt..- . ,� OPeNwOd TMIMW THE VMTAVO IEVW VAL
T�d AOEDDH A010AID 71E x IlED70AE ROMA BTOi dVSTM/YAID
Z N IET&CKDYET0ALLOW .,/ �• E TANV.PROfJ<dMd TO T/EAEDTOA®
m m UNANDDWARMTO �'�ar I ie„ oYso+LwueEnauo�rtaou
n PLwvroN000 aANu yi* 1 y�$
(D -` \ _/��_---.� ,� F CAESTURW�CtNNS.t IMII.
p O \ r/ lLOOSANOOTN97LAESTU DY0ROVI
7. v NNl M PlACE9IN TTE EdTUARYro PRONOE
(D q KULLMENWTAT.
U r { ,y 6 AEEODTAVO PMEITT11AN TAAL NRL
(D PROP(M SEMAKalaro r„ �� wyc TIEaa.
p PAEVEM Tw FSLagem OF TM -� deaIO PEEIOPP61Ed71MNTiitM.MYL dE
O AMOAVOO PROIBRED WIEW THE �•' i TM
D IY AVOW TOTfE EGSTdO TAIL nEMU'R/Y
EpolAVO LEVEE A1M6101R1 1 \ UTXLaW TIE SECK DOM AS MAIL
O� Z \� ` KAwANMLAmTrxWN A#WERYPQM
61 a SIAIER 04W AND OTMER SAL"RRY
fl' `� $ i ; ZIOI�I M PA011 THE 1. LEAMG TW LM/CN RIVEN.
W - LAND ONTO Tr!
(D O j MW Aw e8EEITOMAN
N a TNEde d.YDf10N/N TDdd. ` I QdVTe�
urrc rroAN
ms �
>a;
D n oe, �oML ti
(D .r . i DLyyA1�7\\' AI A Nat /
CPM
co
cn
co
- APPIIQbAATE1Y248M c✓LIP/OD.Alrtr� w
AB1014DRi0Y T/E EJOdTIM�
ro STW STOINY179n DIl�MIDEAID __ ie
IEAVY RAPfALL EYWM TWO M.ILLL DE PL4MD . �.. .£-- _ I 1t..
9 0NTMPNSCW-DIAM0OIImMMRN •a.' - .
APPAo colla10AATTON�IE YaoaocroPTOPlenrernTED
PAOYT/lAN UNION RIVER ESTUARY RESTORATION PROJECT LAYOUT
_
I ',... _. • m �'.A»'°"`P" O1YA 1'- �Y 6ngitatring Serviced Anoriata '�awr LNgN/dM19tCS7IpRY/ffi6101RtJKW r� Z
PR07&CT WYOUT N �d
� -.- _.. - �.„•"q �a»n arp:.,r.Pes:e/eeaJ ru-rrr. Ar AY
9 xa»W✓>r Git I
]." ESTU1RYfESfOf�A` c y.p!' �i PREPARATON F/L/YS AfID GPwIXNG OFSM 0A9'O.�L
1 ADFW'P ISO AIYr T'O'\ AREAS.
c ySi TTDEGAiie. ' !
1 I I 'Yt !Y7 y M.3 1.lit?TOTLL THE SD/L w8PU6AL AREAS AND WINDROW THE
TOPSOfLWIHE CEHTER OF TIE FfELOS•WNNG THE 7U^
1}YA DR GYP %J! 411>t.r } }h� I:n^��'•''I I�TI SOR NORTHAND SOOMNtOY THE O/WN°GEAiCH3.
i i! T< ti t 2IXGVA?r TNE0P"GEDITOHSAND SPREA077+E
CJL.YlIRi o /� 1 ,� - \ }Ih '..II OK,AVATSDSOMOWINLRVM MDRY.
MFEET� ( 1,���f &MCETHESOL&MCAVATEDFRONT1EDRAIMWE
'HOPE�YER OITC/IES NASd1l®-BAYNGiK fIQOS TO ORAOEA/m IBOIQTtoNCt I_ AOPi THE FWQ SUtOVD670 DRAK
►/���J � T'T I i y.-+•�9�`"dI y4 S�1'i` j W7W TICE 0AT6.� ,"r 4.SPREAD THE T'OP M"T11ATH4D BEM WY.GROKED
—" `` / NG 10'C/AP/ \ O+Ip � "'f•�7"'/'�}+Ij,� �S.I {4 WICR ONOR THE FARMFBDS.
C WTTNA LYA CAA° `�� -• .-�' ! IF�y'q V"ti,.T�� - a"!'(J�� AVSD P9Ofr�Y LIAWVWTHE TOPSOL FROM 77M RESIOfii1RQY SITE
ARDSPRMirOVfiMTNSftWMW=
E10SFRMa N'CW WWRT
LFlNWN DTNDE 7TIEPMCFiRATFIFL06lNW R610
D ITI GLRRANDC'CATEOCRY4- V`1- SPADING EOUWAENT FWS1ORACETEFlFtne TOA 1%
➢S2{SF•PKU61TB7E �86 \o O O SLOPi TO DRAIN TO THE DRAMOE DITCHER AFTER
EAAERGEM•BATNdA77 �� �L�F,f GRADINGROTOTLL TM FELDS TO PREPARE THEYFOR
AREA IS BPJh7i lURABTO av AN 7$�" ...f r o P 11 -' \\ �///i•_�. Tao
PLANTING
PAHr.
WR.
/WYORGWMSAB 01FCTO
ANNUAL BA3.DO NO FiLW AYTFPNSCrAWFCTOR
//n SHADWARFA
Z
m rWDFWP�QPERTYI I�' L ` FYeDATTOrFJxry�.\ 8
C7 FORESTTD NET1AN05
0 VI
7C TH&W iNo sNAOSDAPAEAS SHALL BEUSSDAS
KTFAM1fA7E DOL 019°QSALAREt6THE F01
SWTWR2S WILL BESMED W TNSR&D EY
N THE SNWW.ER.00 NOTFlIL OUTWE
TE STA915D BOWAMMS.
OS Yor90L' 1-a N� a�; ',� ra...r •� ,u> - -
x r RE" I� I aR w Ra�
p° o \ _ y '� '� t •`` iJ , T-aasMOMLLYFLOO D a X ��s
T i T,7tEMgM THISAREA IBBHNG
W ,•• 4 ` �.� Wv +�o w N 4� ti I,I �' UOEDAREA. LVIA LTOTAT
i : y
00
Ln
co
WERANDB-PALUSTMFUAM 9REEM SOX ggpo AL ARF.A GR kVG PLAN GRAPHA:ACAIR
MOKA SCRUB Y,ST2 SP-THIS AREA IS 5('AI
BGNG FARATED CNANANWAL BASIS
W NOTRACERLLM 7N'SAREA
�.' i
...�'"e TW1pYgNENESTUVfY/3�vTCTRATA7V!
yy`3a n'°�J°�' `�" R1S ErgifNering Serv+cEs.1sAsci2les u,w„
r�..Nt w.B,,,a{JT,I Amr a,.,t REVISED SDIL DISPOSAL PIAN
(\� �'� .��� N.6 d18 GWYAn fM>1 ARc! "' �•°' (TO AVDID P}IS 7rRTLAND9 IN LHS Pr 18
��� Amwa JA7t11. ArrAR,A'6➢S7FF I.AN)n�-Tiir -°'M FA@N FIBLDS.
ar at
7. THE STORM WATER DRAINAGE AND STORAGE ANLYSIS
The existing WDFW property stores water that drains onto the site from the town
of Belfair. Historically, flooding during big rain storms and high tide events have
been a problem on the property. There are reports of Rossel Road being flooded
for short periods of time during high tides in the winter. The following three
graphics illustrate the existing stormwater drainage patterns for the site, the
critical tidal cycle, and the proposed stormwater storage and conveyance
facilities common to all the alternatives when part or all the existing levee is
removed.
The restoration project proposes alternatives to remove the existing levee and
replace it with a setback dike with a crest elevation of 18.0 (MLLW). In order to
prevent flooding of Rossel Road the project must build new storm water storage
on the Pacific Northwest Salmon Center Property. The amount of storm water
storage required has been calculated to be approximately 10 acre feet. The
storage will be constructed by removing approximately 25,500 cubic yards of
earth from the existing farm ditches and placing the soil on the fields or using the
soil to construct the setback dike. The computational methods to design the
storm water conveyance and storm water storage system are as follows:
1. Calculate — using computer models— the stormwater runoff flow rates and
volumes for the site, and the watersheds that drain to the site, for several
storm events. The graphic depicting the existing watershed is shown in the
FIGURE 3 —EXISTING WATERSHED CONDITIONS.
2. Calculate the time the proposed tide gates will be closed during a major
storm event that occurs at high tide. A 100 year tide combined with a 2
year, 4 hour rain event was selected for the design event. The time the
tide gates will be closed by the tide is estimated to be 4 hours. SEE
FIGURES 7 AND 8.
3. Calculate — using computer models — the volume of stormwater storage
required for a 2 year, 4 hour rain event. This volume was calculated to be
10 acre feet. SEE APPENDIX A— Page 18, Table 1.
4. Design the storm water storage area to provide the needed storage below
the critical flooding elevation of elevation 10.5. SEE FIGURES 6 AND 9.
5. Design the storm water conveyance facilities to carry the flow from 100
year storm events. SEE FIGIRE 9 and Appendix B.
ESA Inc.210 NE Cherokee Beach Road, Belfair,WA 98528
Page 11
+ ' I
Al
#.=2
, t
k
r�
` SO L TYPE
DRAWAGE SASM N-1
AREA=11.T ACRES
pRApYAriE
BASIN N
AREA=27.5UWMFAVFA 3.
•G�"' Aq A
ENTUART
}� k BYERLY RD. ,
� a ,, rf►.. I"'�. 1 5
BASIN M 1
HOOD CANAL �\�AWA 129 ACRES
WFILTRf1T10NPOND ,
,.
2, r
� t
WATERSI®DATA
WATERSHED N-1 WATERSHED N WATERSHED M
CLASS D SOILS-EDMONDS TOTAL AREA-27.5 ACRES TOTAL AREA=129.3 ACRES
FINE SANDY LOAM- CLASS A SOTS-EVERETT SERIES= TYPE A SOILS-EVERETT SERIES SAND-GRAVEL
TOTAL AREA m 11.7 ACRES U ACRES IMPERVIOUS-8.3 ACRES
IMPERVIOUS=A AC. IMPERVIOUS-3.5 ACRES LAMYNILANDSCAPE=13A ACRES
FARM-HAY FIELDS=10.9 AC RESIDENTIAL=12 ACRES SECOND GROWTH FOREST a S33 ACRES
TIME OF CONC. COMMERCIAL=1.5 ACRES TYPE D SOILS-ALDERWOOD SERIES
200',HAY,SHEET-0.5% CLASS D BOAS-EDMO N DS FIE SANDY LOAM IMPERVIOUS=2.6 ACRES
40W,HAY.OVERLAND -0.5% AND MUKELTEO PEAT-21.2ACRES LAWNILANDSCAPE=2.0 ACRES
FARM-HAY-14.4 ACRES FORESTED WETLAND m 39.T ACRES
FORESTED WETLAND■0.0 ACRES TIME OF CONCENTRATION
TIME OF CONC. 2OW SHEET FLOW,FOREST,10%
200'SHEET,GRAVEL,4% 92T OVERLAND FLAW,FOREST,10%
25C OVERLAND,FOREST.16% 823'CHANNEL FLOW,FOREST,14%
400'CHANNEL,FORESTED WETLAND,i% 260'CHANNEL FLOW,4%
1,A00'-V VEG.DRAINAGE DITCH,0.2% 200',CHANNEL FLOW,16%
SW-11-CUP CULVERT,1% 1,72%V VEG DRAINAGE DITCH,0.2%
UNION RIVER ESTUARY RESTORATION
ENGINEERING FEASIBILITY STUDY
STORM DRAINAGE RUNOFF STUDY
SCALE: 1"= 800'
FIGURE 7: URER PROJECT WATERSHED HYDROLOGY
ESA Inc.210 NE Cherokee Beach Road,Belfair,WA 98528
Page 12
- u 8'0-eo0:Zl
U 0'0 doe:R
Q 1J I d00:LL
Z
,pestz u6'£ d00:0L
wmNmn dOC�6 '=q m
11 C9 d00:5
U6'L dOGB
U t 6 do0:8
00
U OOL dDC:I
_-
..... - U L"OL dpD:L
:..- .. U L'Ll d0e:9
I
j N£'Lt dD0:9
j m 11 Z-lL dDE:9
Il 8'Ol dDO:S
W j N Z'OI dovi,
U S 6 d004
all
U 8'9 dOE:f
U 0"8 d00:E
-� — U E"L d06:Z
u 8"9 doo:Z
O a U t,9 d0£:t
N 3 o M doo:t
QN
�w Z � r U O L doO:Z t
C)�a C3 J�J. uCt eovtt
U 98 800:1 t
to p O
0000
U L'6 e0£:OL
u got Zoo:0t
C/) r
_ - --a0mj Ao Nam We"m U 6'tt goes
Il!IRiLY
-- - --- u 9.ZL e00..6 v
a000d
-- M
e00:8 N
• E N 44L e0f:L
tpt
�OW� 11 Y4t e00 L «QQcc
v�i — -� t
allll
- 11 t'YL e0E:9
F -- — 2 a UtiCt.009
�
u 0 LL Zo0s
Ka 30LL U 4'6 e0E:4
1
am im amwo YO dV7d - U9L eo0.4 6
im -
m u t'Z Zoe
N 9-0 e00:Z
m
�m � u 6"0-e0£:L
� a
U 6"L-900:1
I � on N S Z-e0£:Zl
i w
w
5 tt (13d)
i
FIGURE 8: LYNCH COVE TIDAL HYDROLOGY
ESA Inc.210 NE Cherokee Beach Road,Belfair,WA 98528
Page 13
'r
.a
�I
► 1 ► ► � • ,'�• •t wit�"�.t
k ♦•
`I��-
TOP OF PROPOSED SETBACK DIKE PROPOSED NEW CULVERT 24"EXISTING CMP CULVERT
■15.05 NAVD 88 OR 18.0'MLLW 6"CMP CULVERT WITH SS
FLAP GATE. ROSSEL ROAD
4
TOP ELEVATION=12.2'NAVD 68,15.2 MLLW
20.DO _ .__ -_ _ MAX.DESIRED FLOOD STORAGE
EXTREME HIGH WATER=15.5: ELEV.■10.5'NAVD 88(13.5'MLLW)
m EXISTING GROUND
(n PRIOR TO GRADING D.00 1
A
i:.o0 100.00 200.00 300.00 400.00 5W.00 6D0.00 700.00 500.00 900.00
PROPOSED ESTUARY THE BOTTOM OF THE PROPOSED
j SURFACE AFTER GRADING TIDAL CHANNEL AFTER GRADING.
O
m PROFILE OF NORTH TIDAL AND DRAINAGE CHANNEL
ROSSEL ROAD
m
o TOP OF PROPOSED SETBACK DIKE TOP ELEVATION■10.9'
EXISTING GROUND =15.OS NAVD 88 OR 18.0'MLLW VD 58,13.9 MLLW
PRIOR TO GRADING
cm m
s 15.00 T RE GkiiiA
10.00
0 5.00
a a00
W 0.00 1D0.01 N10.00 7.-`0 a.OD.00 OG 600.00 700.00 BOD.00 9DD.00 i 00 1100.00 12Da0D 1360.OD 14G.�. 1 1600.00 170f100 1Bt
_ 2-24"EXISTING CMP
THE BOTTOM OF THE PROPOSED PROPOSED ESTUARY PROPOSED NEW CULVERTS CULVERTS.
TIDAL CHANNEL AFTER GRADING. SURFACE AFTER GRADING TOTAL OF 2-36"CMP
D CULVERTS WITH SS FLAP
GATES. MAX.DESIRED FLOOD STORAGE
(o ELEV. 10.5'NAVD 88(13.5'MLLW)
cco
n PROFILE OF CENTER TIDAL AND DRAINAGE CHANNEL
co TOP OF PROPOSED SETBACK DIKE
=15.05 NAVD 88 OR 18.0'MLL ROSSEL ROAD
2a00 ELEV.10.0 NAVD 88
Ell H A 3.3JrAltD i ELEV.13.fl MLLW
15.00
IMoo
5.00
0.00
aDo 100.00 zoaoo � '� 590.00 PRO7POSED NEW CULVE t000-o0 MAX DESIRED FLOOD STORAGE
THE BOTTOM OF THE PROPOSED pROPOSED ESTUARY TOTAL OF 3-36"CMP ELEV.=10.5'NAVD 88(13.5'MLLW)
TIDAL CHANNEL AFTER GRADING. SURFACE AFTER GRADING CULVERTS WITH SS FLAP 18"EXISTING CMP
GATES. CULVERTS.
PROFILE OF SOUTH TIDAL AND DRAINAGE CHANNEL
UNION RIVER ESTUARY RESTORATION
PROPOSED DRAINAGE CULVERT CROSSINGS THROUGH THE NEW SETBACK DIKE
SCALE: 1"= 200' HORIZONTAL AND 1"= V VERTICAL