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HomeMy WebLinkAboutStorm Drainage Permit - PLN General - 1/24/2012 THE UNION RIVER ESTUARY RESTORATION PROJECT MASON COUNTY PERMITS THE STORM DRAINAGE PERMIT SUBMITTED 1 -24-12 MAR 2 3 2012 426 W. CEDAR Ste, 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 J 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.: &2P 11e( Z- — 0©00S— 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 Droiect.Review by Mason County 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 vroiect,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. Failure to meet the minimum requirements could result in delay or rejection of the application until the N, deficiencies are corrected. r �I � Q 0. Section I-Construction SWPPP Narrative C 3i 1. Construction Stormwater Pollution Prevention Elements Na.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 1.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 BCommunity Development\PAOSTORMWATER 1 of Updated May 20, 2009 5 6.Protect Slopes, See page/paragraph: 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 by the site disturbance _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. _II.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._ 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 2of5 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. H. 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 I:\Community Deve!opment\PAC\STORMWATER 3 of 5 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'/Z 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 _1.Label final grade contours and identify developed condition drainage basins _j. 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 BNWs _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. 1ACommunity DevelopmentT AC\STORMWATER 4of5 Updated May 20,2009 1 r r 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. _in. Locate the construction entrance and provide a detail. 6. Detailed Drawings: SEE 'h 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 stormwater plan submitted for this project fulfills the applicable provisions of the 2005 DOE Stoimwater Manual. AS Engineer' ' Date _.&ma. Applicant Date �®��T�Z �wis-►` '�� �,`v StOPd �� Place eng. stamp and sign/date above. Updated May 20,2009 I:\Communi Develo ment\PAC\STORMWATER P Y tY P 5.of 5 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. [disl] 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 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 $1,000,000 from Coastal Wetlands. Construction is planned to start in the spring and summer of 2012. We have included a several project description image below to further clarify the project scope and description. Two Union River Estuary Restoration 75% design drawings have been included with this SWPP Plan that further describes the project and set forth pollution control requirements. =wR . Figure 1 - Aerial image of the site looking north. 41 R Preferredr,1 +�V ,Ytit Alternative 100' LONG X G'WDE-- PEDESTRIAN BRIDGE (Alternative 12) REMOVE EVMO E 100 OF �,� �. d• ���,.._� ; (((yyy S r EE T 5 Features: � F, J; N300' southern Opening and 100' m northern opening along the existing dike. I' s� - O �.. DT1' NB Concrete bridge to span dike ---n (D openings to retain the trail in the f CHANNEAS o same location. p� 1884 T SHEET Site grading is liited to the tidal AR$H BQUNDAR) m e channel excavation and drainage SETBACK BERM TOP= 15.05 and removal of the topsoil. Borro4yl ditches v4l be filled with some of REMOVE APPROX RECONSTRUCT N the excavated material. 300 FEET OF THE HISTORIC TIDAL `< EXISTING LEVEE s• O . EMBAYMENT AND "'' •.• ., ,OL DISTRIBUTARY CHANNIE 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. GRADING PLAN After preparation (plow & disc), the site will be graded to drain � 1 toward the southern opening and create •�� ���� w tidal channels. � tl tl V i•4 Y Y YI w ^0 V rI M i y WL yl Y Y w ■ W Y-1�1 Y •Y-Y Y� Y Mi/ Y O This work will be done � r y y i C!J ; 4 -a-0-- -a-0 - -0 - -� � • —" •�1 before the dike CD rt - �yw� YMy-rw r Y/1�N •-- �w • y excavation. • Y if f M Y Y-1 i y! r CL 1 r w y w tl v V Y n l 1I 41 ■ r .M tl Y y Y Y Y W tl Y Y KI' w'M Y Y w V ti 1l 41 tl• Y-W .Y tl-W Y M 41 CD s Marsh Composition After Restoration 4 % Tidal Channel G� 10 % Low Marsh m21% Low-Med Marsh i 55% High Marsh m 0 Similar to surrounding - • ; marsh sites in Lynch Cove CD - ..'. t O Q O LOW WATER Low MARSH ■ MEDIUM MARSH HKW MARSH SALT TOLERATE ® UPLAND ■ N UNION RIVER ESTUARY RESTORATION ENGINEERING FEASIBILITY STUDY ALTRERNATIVE CONCEPT 2 MARSH TYPE ANALYSIS SCALE: 1'== SETBACK DIKE CROSS-SECTION rr. -HE'GH? VARIES 1 7 ;( -4 1 4-5 FT EXISTING GROUND PROPOSED SETBACK DIKE ANDTRAIL FIGURE 5: Setback Dike Cross Section Current watersheds and stormwater with drainage toward the "Al MIA = 'Y WDFW property. .- ACMS IMAu" 1 IAM- At high tide, the w OVkRLY� Y• fi A restored estuary site „R, � would no longer store runoff— it would back up into the PNWSC ' farm fields. AALI stormwater storage b y solution is part of the design proposal. ay f FIGURE 6: EXISTING STORM WATER FLOW AND SOURCES 81Page I INSTALL:•irVMR ,. viTRTDnw,r/ev � T:RmcToo�rLACE� EX. ,•CULVERTS& 5 To store the runoff and o� ..eon� k_+ � stormwater f rom c `+ �. uplands on storm events r+► at high tide, the existing farm drainage ditches at now QMAL PNWSC will be �excavated to be wider TDR,,, 9Xu�osfuim.pave WTALL,-W G LveRTs'MRROuoH + `' "it NrWWTDACKOW. and deeper. ,OPLDND 5E tz 7 VMRY WATER STORAM AREA - REQUIRED DURING HXW TWEE.AREA VVRi STONE 19 ACM!FIST 0►summ DRAIN MVNO"OETVVE"EAEVATYQN 1, T r AND 10.r("VD A,DAT1Ae) EXCAVATED AREA.APMOX.].S - ... .- 10 acre feet of storage needed= ACRES 25,500(Y excavation N FIGURE 7: PROPOSED STORM WATER FLOW AND STORAGE PLAN 9 1 P a g e FIR 30 i2.0 O C {l�� ♦P •y pq t 5 ad ti cv 1� NORTH DRAWA AE O=H J 15.0� •i 1fi.0 �}• uACRES-i cr -7 $OIL D� AREAl2: 1 i # © „mac w MrY_ 0 0 � o J O py O 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 THELERTM `!! 3 II�IIIIII'IP�uiR�illl, t aY � oncNum El o �00 MINDY CREEK F y OO �d FARM PLOT 1; FARM PLOT_--_� •�� �, � � _ � 'ARM PLOT FARM PLOP ORCHARD FARM PLOT-`� ♦ _ O O FARM PLOT FARM PLOT �_ ♦ OOOOOO A ALPACA DEMONSTRATION AREA \\ \7" BPACE 1O O p O'J C EX ETING DRAINAGE NAGE DITCH TO PLOT NEW FARMM PLOT .IO O d 00 . LEGEND �„��.•.x-�,,.ms�'�, .,F;'J �ADMINISTRATIVE OFFICES WATER QUALITY LAB r sf'o• ( �6� or �� �BARN!MULTIUSE BUILDING CONNECTORPmx— _ •,J}'�" j /� �t`s1, CARETAKER RESIDENCE oQ� FARN TRAIL SYSTEM I „ .w+� �1��'� ./� �.J !Ir' •`G r N J f ) C GREENHOUSES g� \'-TEO REEMNN�L r� 'iL c�.Yy J"`dt/ sS � W�Fw I I'"`,f.,.. 'lj. •-TRAILS USE EXISTING DITCH CROSSING w'3,g PROPERTY Zl �a E)WTING TRAIL TO REMAIN \\ NEINTRAM. LONG ROSSSEL ROAD \. cPw+K ecNc �ti.•+m n >y ODNNECTIAAL TO rI�ie farm at Wat_er°s E6RI Befaur w-h�ton TNELEN TR o_ Home of the Pacific Northwat,Sabnon Centeundthe HoodCanafSabnm Enhancement Group IIINNII�I'JIIIIIIIN'ITN 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 6tn 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 20t" 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 1st to December 1st, 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 15th 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 1st 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. — Le. 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 15th 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 141Page I 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. 151 FIGURE 1 —VICINITY MAP Tj— z m 8� Gal botalln if r n v �^ 3S � N RIVER m a ATERSHED z SQ.MILES IVER �r t o �PROJEC SITE-33 ACRES /' l a o 7-3 J l.vMh i• Cep _ z i a m .. i s e 122°53.000'W 122051.000'W 122°49.000'W 122"47.000'W WG504122"44,000'W 161Page 1 M'ISM SOUL N OPE NW AND A MC FOOT%W E F®EfDWNORDOE TO RMVA[lYfAESDWM TXW NYE7EFA DOIEECTS THE-STD✓WEWUU roTfE TOMI.MMVF.AND WM E EROYOF HOOD CAAML ,.� c�_AJ�eT- e�' LdAON Ari91 -NCYTn1 OL51TIIDUTARYf]441LIEL SAND fdLL R611T 101 VADE NORM OPENING AM A SLYFWT M W E7R.1VA7EAND NmFJr 7flE k7O.STfEA'i Q.,� PEDFL"IRGW MWDW TO FEPtACE THE E WnNG TRALL OWIM6dro/d®UGTE EMS �J1 SYSTETA PROVIDES A AORIH ACCESS RUN THE - NETOIELSTOMVVCY ID Yd°ROVE / •'g WON RZVBT TD THE PRO°OSEOESTUARY .. , REBTORAIT]VAREA dtlRNM/TAifRARV -. --.. _ \ 1 �. •'t. yti 1 % CHAMPAL Rsaronvta+uETmcd drEwOLLVFNTWMRAP 1.TMPROlE MU.RESTOW M ACRES CP ROES ROAD A f Qr /1 �--J, ao 00-00M TI RMMTUA THE EMSTINO LEVEE M LL ROEEAELAO TIDALLO ` AETSICDMANAGALLO1V 1� i° \ `� M47FRAE ROLES ESTO MRECTMTYAIO M.oWrpoW"%n Sri. 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'' ` wnu SI E w:Z ROA S vN Y laPMAMr �EMSSQ 5CF l(E RW C 5 OVER IEILRC AREAL EPMATU4R&M—Wwz ROAN ew.l ii o+hR AT 1 Tdi.91E MQ8 Im10. V INwe�Mt�r'mCN ai-flei ieaasNCl�d e1�M Y N�m�wN I�uY1� � 0 �eF 3rF^Hinminuv e;R NR uao n iwi rRNO°Iwii aam mrxt € pp 1�yFp Ran/H pWnpllnq yp�Y{L �.✓- F � Y«MT�IIs MO�.Ym MI�p A ImE eMdAiD ilIMW16 5,101 NIY® R H � v � aE,srmvtwA -aaaEe�wEwoAxr -ES-4 vR�OSIOMp CONTROL PLAN rA)N 18 1B 1--+ w�i. �e9 wrAee sr AIQH(JM/Jra-saN wR N el.. U4 CD �ttiF sTAr�o 4 � o b 7 6 � S rd'lt�t39 aay 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: [X] 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 UNION RIVER ESTUARY RESTORATION DRAINAGE REPORT PREPARED BY: Pat McCullough, PE 1- 22-12 — y -k W­x vT'g'N.- y f .r,•11 d Y•C�,t�f�-e�'ra p.Y� - ~7t I.Y• -.: � }� 17 �� y4 F a fs�s�}y'r�*'%'.s yy"s.::''�__j��i t•lam.' A`r � (�,��" �f � piT �' �.:Vr ���+•f�p, t J��•AY�.:?' r°` S ti t J ti.'+�1�'i y`'V i ,���a-.✓�rj\ c--�-� r� ��3 13)Y��°, l� r�!: .,aij� i�^'lt�.• T.1• �� , �' csP t .� ✓s \ 1"•fi.. y I LOWER"000 GRAL RESTORATI LYNCH COVE SALT MARSH ;�(;_�^ - �( q•1" I PROPERLY AgUISMON Ivrf wji•: - SCALE:1"=200' I � \: r l I•: +� 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. I jV y r � I I C , rz 4�•' 3 J AIR o ate ra 122°53.000'W 122°51.000'W 122-49.000'W 122r47.000'W WGS04122°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 J f�$C' OPER y OF I�YDFW� /f 14{\?'rt�"L.. PROPERTY o� NOT A PART OF _`-- TM PROJECT j � � t _ � f 40 Ate'OF Y ti PRO"m-To-A# CONVE}ITo MCK MITO K f �r �3 J SITE TOPOGRAPHY @ MLLW SCAL&Y•3W 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. SECTIONS 29, 31, AND 32 T 23 N, R 1 W, WM M ! 4�4 2S" g '2A3Q' �/ scs 2 p 21 .2� l ,M 1 23 • �7 /1019 / • 1 /48 r 4 • 1 • $ � ";ter :'�;- � •s�. Y i --D 03 CRANIELS ,rinseWAUM TRAAL D l a r TIDAL MARSH .�. , THUM WE7L AW � A ► A H SCALE:1'-500' 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 • t r v y '^. f e = rtit�!'t' .�"nts'ac? iS.•` 4; ,-, t _ w s• s `� •r L....= j� 5 �f d a' 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. I 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 The estuarine habitat is designed to accommodatingstormwater drainage. g g 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 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 environ mental 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 DRAI NAG ESTU DY STORM DRAINAG ESTORAG E VOW MES AVAUABLE IN THE PNSC FARM DITCHES BETWEEN ELEVATIONS 7.0 AND 10.5 NAVD 88 DATU M DITCH ELEVATION SURFACE AREA AT DITCH DITCH STORAGE VOW ME 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.S0 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 1 i 3WIIWMUTNOFE/MDANDA MENRJOTWCE r®carnwnosEror�i�r TNNL ' ` smEu cadecTs THE REtnriwinro TNe tf w TDV.taANDWID ENEN�Ya NOOO OANML - e'' LOELwNeT NAxMardTwwnArnaLwAa 94N0 MLL POALA Im WOE NOWM CPVdMAIDAMTpwrmx PMMAWNMWQEr0AW AM"e BIO MA TNML ND EWAVATEA WREN ON EM"M - �•'• 1'• SMULP�mes.Plo"AOOEMNM IM � CIMHBdroNEw Tw . �." 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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 J 17-; IL DRARll10E BASIN N-1 AREA=11.7 ACRES 'i G ^x f4 , DRAINAGE N \ � -NN A- BASNi N �► �g AREA=27.5 UNONuvEjt ACRES �� a ar dnv F T wmr r3^uwr FW GATER M AI" '�r iry ' i,x; lil �. ;ttP��,J*' ' ,a� 'tip• cl �� i .? FARM ��•1 ; � `�.��,y�y � i �l a�i� 1 AREA 129 ACRES '� 4 �NFlLTRATIOM POIID ;m ` 4• V. ,we 1 i1 WATERSHED DATA WATERSHED N-1 WATERSHED N WATERSHED M CLASS D SOILS-EDMONDS TOTAL AREA-27.5 ACRES TOTAL AREA=129-3 ACRES FINE SANDY LCLAK CLASS A SOILS-EVERETT SERIES= TYPE A SOILS-EVERETT SERIES SAND-GRAVEL TOTAL AREA-113 ACRES "ACRES [IMPERVIOUS-8.3 ACRES IMPERVIOUS=A AC. IMPERVIOUS-3.3 ACRES LAWN&ANDSCAPE=13.6 ACRES FARM-HAY FIELDS=10.6 AC RESIDENTIAL=1.2 ACRES SECOND GROWTH FOREST-5"ACRES TIME OF CONC. COMMERCIAL=1.6 ACRES TYPE D SOILS-ALDERWOOD SERIES 200',HAY,SHEET-0.5% CLASS D DOLS-EDMONDS FINE SANDY LOAM IMVERVIOUS=2.5 ACRES 400',HAY,OVERLAND -0.5% AND MUKELTEO PEAT=21.2 ACRES LAWNILANDSCAPE=2.0 ACRES FARM-HAY-14.4 ACRES FORESTED WETLAND-39.7 ACRES FORESTED VVETLAND■6.8 ACRES TIME OF CONCENTRATION TIME OF CONC. 200'SHEET FLOW,FOREST,10% 200'SHEET,GRAVEL,4% 927'OVERLAND FLOW,FOREST,10% 25C OVERLAND,FOREST.111% 623'CHANNEL FLOW,FOREST,14% 400'CHANNEL,FORESTED WETLAND,I% 990'CHANNEL FLOW,4% 1,000'-V VEG.DRAINAGE DITCH,0.2% 200',CHANNEL FLOW,If% 50'-10'CMP CULVERT,1% 1,723„V VEG DRAINAGE DITCH,0.2% UNION RIVER ESTUARY RESTORATION ENGINEERING FEASIBILITY STUDY STORM DRAINAGE RUNOFF STUDY SCALE: 1"= 880' FIGURE 7: URER PROJECT WATERSHED HYDROLOGY ESA Inc.210 NE Cherokee Beach Road, Belfair,WA 98528 Page 12 u 9,0-CWU U00 doe:I L U vL doo:i L 14 v*Z doe;o sx u s,c dwo U C.9 doe:6 ... ..... .... U L'9 d006 2'i .... .. U 6'L dove oe V t-6 d00:9 v 0 0 t dovi Y 1."0&doo:t U L-Lt doe:9 U C It 6D0:9 Vey U z7 L L doers U Q'ot d00:5 u E'm fteli, V 9-6 doo:t u 9,9 dove U O'S doo:t 4 C"t doe.'Z u 9 9 dooz Og C) urg doe: ' > Cn cl V C 9 doo:t 0 m N V S 9 d09:7 I L)2;,, ❑ W uoL dou L 36 U L'L 90V I L C: 3 4 gre 900:t L 000. ....... U L*6 8=0 t 000 7 v Wot 0000L 000. 9 WM US I UVI 10*WAM Man a N0.1v'w voVi 119?t e00:6 IJ 9 C L eOVS U VK EMS 11 v"20t:L ]i v Vt COOL iq U Vilt 60V9 u v ct R00:9 4 s U eMs 4 0*Lt 900:5 u am vs =Lam r"'ame On" 4 9 L 800-4 u L's ROVS Dee 8001 e0c,z 800-z v s'0-voc: 4 6'L-e004 ce M 9Z-80e:z L 11 9Z-v00rZt w FIGURE 8- LYNCH COVE TIDAL HYDROLOGY ESA Inc.210 NE Cherokee Beach Road,Belfair,WA 98528 Page 13 %i • f 'Y *ems =ar ' r r• — • 1 � • c -,�`,.5�,�'[ -gip v-k ,.ti���y�'w���?y�Y�.y � 3•y . � �..�: Wit.. • • Mm •• TOP OF PROPOSED SETBACK DIKE PROPOSED NEW CULVERT 24"EXISTING CMP CULVERT ■15.05 NAVD 88 OR 18.0'MLLW 6"CMP CULVERT WITH 88 FLAP GATE. ROSSEL ROAD TOP ELEVATION=12.2'NAVD 88,15.2 MLLW 2a.D0 -- - MAX.DESIRED FLOOD STORAGE EXTREME HIGH WATER=13. I ELEV.■10.5'NAVD 66(13.5'MLLW) i U.00 EXISTING GROUND PRIOR TO GRADING 0.00 D � c;.aa 100.00 zoo.00 soo.oD 4oaoo soo.ao 6oa.aa 7oa.00 eoaoo aDo.rx� 9 PROPOSED ESTUARY THE BOTTOM OF THE PROPOSED SURFACE AFTER GRADING TIDAL CHANNEL AFTER GRADING. a m PROFILE OF NORTH TIDAL AND DRAINAGE CHANNEL ROSSEL ROAD fD TOP OF PROPOSED SETBACK DIKE o TOP ELEVATION■10.9' D EXISTING GROUND =15.05 NAVD 88 OR 18.0'MLLW VD 88,13.9 MLLW PRIOR TO GRADING s 2a.a� REME k�IGH-�1►A-� 73 NAVDA 15.00 10.00 0 5.00 IF ■_ a 0 00 _ O.lSJ - 1�'C1,0? Z('A1.00 3tY.J.a`.J +.00.0a .00 600.00 700.00 flG'a.0; 900.D0 10 J.�.i- 110D.00 1200.00 1300.OD 1400.IX1 1500.00 17D0.00 iflt _ 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 FLDOD STORAGE cD ELEV.■10.5-NAVO 88(13.5-MLLW) Lco nn PROFILE OF CENTER TIDAL AND DRAINAGE CHANNEL co TOP OF PROPOSED SETBACK DIKE =15.05 NAVD 86 OR 18.0'MLL ROSSEL ROAD ELEV.10.9 NAVD 88 20.00 - P-- , ELEV.13.9 MLLW i 5.00 E H H WA 3.3 NAYQ.88 10.00 - a.ao 0.07 100.00 2D0-00 c .00 4=00 500.00 r .00 7aD.G� 500.00 900, 10p0.00 110a.00 1200-00 PROPOSED NEW CULVE 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 GA WITH SS EXISTING CMP FLAP GATTES.ES. C CUULVERTS. PROFILE OF SOUTH TIDAL AND DRAINAGE CHANNEL UNION RIVER ESTUARY RESTORATION PROPOSED DRAINAGE CULVERT CROSSINGS THROUGH THE NEW SETBACK DIKE SCALE: V = 200' HORIZONTAL AND 1"= V VERTICAL