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FINAL WETLAND MITIGATION PLAN
<br /> MTORRES AMERICA
<br /> 905 80TH ST SW, EVERET Tj WA PROJECT MONITORING AND MAINTENANCE PROGRAM
<br /> Requirements for monitoring project:
<br /> PORTION OF SECTION 12� TOWNSHIP 28N� RANGE 4E� W.M. 1. Initiatcompliance report
<br /> aMAa,,, 0 � ,� E,„�.ej,�aa, 2. Semi-annual site inspections (spring and falt) for five years
<br /> `�" °" `� """`""".°''° 3. Annual reports (one report submitted in the falt of each monitored year}
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<br /> " �"' °'.°90e' The purpose for monitoring this project shall be to evaluate its success. Success �
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<br /> "°`^`� ' i will be determined if monitoring shows at the end of five years that the
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<br /> ' �Es ..a�sa , , ; a; - � �� �. �a3 ,, ,� ,«, ; _a,sp : ,.�. �as ' � ;� :� : � � definition of success stated below is met. The property owner(s) shall grant
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<br /> WETLAND C �,>M� ���^�<^�� � ;��� � �"� �`� � �� ,5a°"`� " � access to the mitigation area(s) for inspection and maintenance to the
<br /> CATEGORY III „;E�°M„ ' ��� ' ��������� ��=�°° ;� fXISTING �.`� ��� * � � � contracted wetland professional and the city inspector during the period of the
<br /> aE�,o�: '��` � �` � �` � - �`�� I W bond, or until the ro ect is evaluated as successful.
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<br /> BE FILLED � R:;9e:;r ;�_ �`����:����'�` �a; �r�li,�i�!i�i�,t�`V1'', t `. j �g
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<br /> ��e� � �� �� �� �` � ' ;y,;, � �1 ' I 4ti � � i �,T��p g ` '� ` , s N i inspection by a qualified wetland professional shall be made to determine plan
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<br /> ;�M-� " `""°'"' ` , m ` � ��: � � (F � . � `�� ` com liance. A com liance re ort shall be su lied to the Cit of Everett within
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<br /> " � � �� �� � /. ' �� ` 1.�. ' � , 2,5 4�S . � ` ; ` g ` 30 days after the comp(etion of planting. Condition monitoring of the plantings
<br /> �.` ��'� ��� �� � �� ' � \ ` � \ • shall be done by a certified wetland professionaL A written report describin� .
<br /> /V ' r'�� � � � � ` �HkNN ' T �,F1 `I� D . , � : . ; y BUFFER RE-VEGETATION PLAN - TEMPORARY DISTURBANCE
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<br /> t � ��W�T1�4�lD (c � � , e , , s , . .� the monitoring results shalt be submitted to the City of Everett after the fall
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<br /> �.�.o,��. ' 02 � � . , � , >ii � , f I � � � . � � Cleared areas in the buffer re uire a lon -term re-ve etation lan. Grass
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<br /> -,y , . � � � � � ( , � . � site ins ection of each monitored eac Final ins ection will occur five ears
<br /> o�,�a � �- �� ��� � �� � ,� ��I � � :I I I - 1 - � ` � - I seedin shall occur after the im act and native s ecies lantin shall occur in P y P y
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<br /> ��.� �Po� � P k� � � after com letion of the ro'ect. The consultin wetland rofessionat will
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<br /> � ' � : '° � ' 8 r �_ _ �� the falL All disturbed areas shall be monitored at least once er ear for a
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<br /> R�M�PS�� , � , � � � � ! : ; , 1- , -"..- ' r 'i : Defirntion of Success: The lantin area shall su ort at teast 80% of the native
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<br /> ,pM.„ ��.�� . ,� .� , , � � � � ,� � �,� � , lq;g76 5 . � )' y Given the uncertainty of the total impact area, the re-planting plan is based on
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<br /> a�,�,,.�, E.�'�"� , � ; , � ` �; � : p ts s t o t t e a roved lantin lan b the end of five ears. The
<br /> �E�n.�. ,� � ! „ � � � � i �'% � � ' '� a h othetical 1 000 s uare-foot buffer im act area. T t uf r im PP P � p y y
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<br /> , � s ec es should esemble that ro osed in the lan but strict adherence to
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<br /> _ . � I � � ! I � : , be estimated in the field ost-construction and final lant uantities shall e
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<br /> ,. ., I � �� � t t e s ec es shall not be a criteria for success. B the end of the
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<br /> 0 , ;� ,�,„�„ , � �, ,Es,,� ,,. , a�.,�,.., determined in consideration of the species composition below (10 trees and 42
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<br /> , ' G , 1 / DETE � r , � ` shrubs er eve 1 000 s uare feet of buffer disturbance . t g o g seaso , t e percent aerial coverage of native plants shall be 80%
<br /> ,��° w, , � r P ry , 9 ) in the planting area.
<br /> AF�l�Y � ,� � , `POND �
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<br /> �`:�:°� . ,�.;�' .� , � ;' aaPo�+oK«,: '�� n. �`�� '� . y' � ' ; � .' ' �, .�, I . COI'TIRIOIi NdRI@ Latin Name $1ZB $ dCl� Udiltit
<br /> � � , . ''. Y , ,,.,,� - � , , , g ' , Maintenance: The planting areas may require periodic maintenance during the
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<br /> � � 1 Douglas fir Pseud menziesii 1 gallon 10 5
<br /> ,^.E;;;;,a ` � ` i ' �� � ' � , , , , ,�„�;ars, \ �a 2. Western hemlock Tsu a hetero h 1(a 1 allon 10' 5 monitoring period. Maintenance may indude, but will not be limited to,
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<br /> �r , , -_. �„,„� , i , , , �,s..a,,,� , , ;` . ,E,,,.t„E, ;ESe,;;;„', . Beaked hazelnut Cor !us cornuto 1 allon 5' �4 removal of competing grasses and invasive vegetation (by hand if necessary),
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<br /> �'`� s�. �<� '�`� � , 3 y � , irri ation re lacement of lant mortalit fertilization and/or the re lacement
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<br /> �.e aµ..,,�� \ i of mutch. A ressive contr t f i v iv r m
<br /> «.:,,�, -� � : --_ , � ,9 : -`i - " ' .- - ..�. " 5. Oso-ber Dem. cerasi ormis 1 allon 5' 14 �g o o n as e g asses ay be required in the
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<br /> ` A� �� .. .�>„,c. i ._ ....': ....,. .. . .. . .` �°' • pplicator following allrlabel instructions.
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<br /> � �\"�. ( � � �� �' `� � $ S�Q � ,� u � WETLAND RE VEGETATION PLAN - TEMPORARY DISTURBANCE
<br /> ` �ff 3 � BUFFER Cleared areas in the wettand require a tong-term re-vegetation plan. Grass
<br /> ' \ IMPACT � seeding shall occur after the impact, and native species planting shall occur in SENSITIVE AREA SIGNS AND FENCING .
<br /> \ ` 7,522 SQ. FT. � the falL All disturbed areas shall be monitored at teast once per year for a q split-rail fence and Sensitive Area signs will be installed along the edge of the
<br /> \ " �� � WETLAND minimum of two years. wettand buffer to permanently mark the boundary of the Environmentalty
<br /> � Sensitive Area. Exact sign language and locations shall be approved by the City
<br /> � �� �I WETIAND FILL Given the uncertainty of the total impact area, the re-planti�g plan is based on of Everett. An example of sensitive area sign language is as follows:
<br /> a hypothetical 1 ,000 square-foot wetland impact area. Total temporary
<br /> $Cdle 1" = 100' � BUFFER �MPACT wetland impacts shall be estimated in the fietd (post-construction), and final ENVIRONMENTALLY SENSITIVE AREA
<br /> � WETLAND CREATION plant quantities shall be determined in consideration of the species WETLANDS - STREAMS - STEEP SLOPES
<br /> �s- ioo�oo � STREAM GRAVEL SPECIFICATIONS composition below (10 trees and 42 shrubs per every 1,000 square feet of HELP PROTECT AND CARE FOR THIS AREA
<br /> As specified in WAC 220-110-080, a minimum of 4 to 6 inches of dean, rounded, wetland disturbance). PLEASE DO NOT DISTURB PER EMC 19.37
<br /> uniformly-graded gravel with a size composition as follows will be used in the
<br /> new stream channel. Common Name Latin Name Size 5 acin uantit The signs shall be constructed of aluminum or other durable material. They
<br /> 1. Pacific wittow Salix lucida 1 gallon 10' 5 shatl be secured to a pressure treated or vinyl posts (4" x 4" x 8'), buried a '
<br /> 15% 4.0 to 3.0 inches 2. Red-osier dogwood Cornus sericea 1 gallon 10' 5 minimum of two feet deep in quick-setting concrete, or affixed to the split-rail
<br /> 40 % 3.0 to 1.5 inches 3. Btack hawthorn Crataegus douglasii 1 gallon 5' 14 fence.
<br /> SITE DESCRIPTION PROPOSED DEVELOPMENTAND WETLAND MITIGATION MEASURES 45% 1.5 to 0.25 inches 4. Twinberry Lonicera involucrata 1 gallon 5' 14
<br /> Wetlond Resources, fnc. conducted a wetland delineation to identify The applicant is proposing to grade the site to prepare it for future light 5. Pacific ninebark Physocarpus capitatus 1 �allon 5' 14
<br /> jurisdictional environmentatly sensitive areas in December, 2005, on a 16.3 industrial development. Building pads will be located in the southern Fines less than 0.25 inches shall not exceed 3.0% of the total volume of the
<br /> gravel. The gravel to be used in the stream channel shall not have gone
<br /> acre site located between 80th Street SW Hardeson Road, in Everett, two-thirds of the site with access from 80th Street SW. A detention pond is through a crusher. CONTINGENCY PLAN
<br /> Washington. The property lies in a portion of Section 12, Township 28N, Range proposed in the northern portion of the site, between the building pads and if 20% of the installed plants are severely stressed during any of the
<br /> 4E, W.M. Wetland A. A future buildin ad with arkin is ro osed near Hardeson Road PROJECT NOTES
<br /> g P p � P P ' This project shall be constructed during dry seasons to the greatest extent inspections, or it appears 20% may not survive, additional plantings of the same
<br /> in the northwest corner of the site. species may be added to the planting areas. Additional contingency elements
<br /> There are currently no structures located on the subject property. Site BUFFER ENHANCEMENT PLANTINGS possible. Construction during low ftow periods with careful erosion control may indude, but will not be limited to: more aggressive weed control, animal
<br /> measures will greatly reduce impacts to on-site and downstream systems.
<br /> topography generally slopes down to the north with a ravine down the center In order to accommodate the future development proposal, the drainage ditch Both sides of the proposed stormwater conveyance channel, totaling control, mulching, replanting with larger plant material, species substitution, .
<br /> of the arcel. It is hi hl incised with stee banks caused b the velocit of is ro osed to be culverted alon the eastern ro ert boundar Wetlands B a roximatel 16 000 s uare feet are ro osed to be lanted with the Ctearing limits shall be staked, flagged, and/or fenced off prior to initiation of fertilization soil amendments and/or irri ation.
<br /> P � Y p Y Y P P � p P Y y' pp y ° q � P P P any land clearing or land alteration. � � �
<br /> the water ftowing within steep banks. As a result, large amounts of sediment and C are proposed to be filled, and 7,522 square feet of buffer will be following �ative species.
<br /> are being transported downstream and being deposited into a downstream permanentty impacted. As stated earlier in this report, the drainage ditch does Project Sequencing: A pre-construction meeting shalt take place between the
<br /> wetland. Surrounding land use is comprised of light industrial facilities. The not meet the definition of a stream and is exempt from regutation by the City Common Name Latin Name Size 5 acin uantit applicant, consulting wetland professional and equipment operator(s) prior to
<br /> property is forested with red alder in the overstory and salmonberry in the of Everett. Wetland B is a small wettand located along the ditch and Wetland C 1. Douglas-fir Pseud. menziesii 1 gallon 10' 30 ' MAINTENANCE AND MONITORING BOND
<br /> any disturbance. Prior to this meeting, erosion control measures shall be
<br /> shrub tayer. is a small wetland located north of Wetland A. Due to their small sizes and lack 2. Western hemlock Tsugo heterophy(la 1 gallon 10' 25 A performance bond or other assurance device shall be provided to the City of
<br /> installed as described in the site engineers TESC Plan. The purpose of the
<br /> of vegetative diversity, they do not provide significant functions or values. The 3. Big-leaf maple Acer mocrophytfum 1 gallon 10' 25 Everett for the period of five years from the comptetion of the project, in the
<br /> A draina e ditch and three wetlands are tocated on the sub'ect ro ert . The buffer im act area is dominated b small red alder and Himala an blackber 4. Vine ma le Acer circinotum 1 allon 5' 64 pre-construction meeting will be to verify the installation of erosion control amount of 300% of the estimated cost of earthwork lant materials and labor
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<br /> measures and to discuss project sequencing and staging. Planting and grass
<br /> drainage ditch begins near the southern property boundary, flowing from the providing low functions and values. 5. Snowberry Symph. olbus 1 gallon 5' 64 and construction oversight by the wetland consultant. This bond shall be
<br /> seeding will take place immediately upon completion of the excavation to
<br /> stormwater system under 80th Street SW. It flows in a linear ditch toward the 6. Beaked hazelnut Corylus cornuta 1 gallon 5' 64 released at the end of five years, upon a successful determination by the City
<br /> north, through the ravine in the center of the parcel. Significant historical In order to provide mitigation for culverting the drainage ditch and filling 7. �regon grape Berberis nervosa 1 galton 5' 64 prevent erosion. A post-construction inspection by a wetland professional shall of Everett for all portions of this mitigation project. The definitions of success
<br /> take place to determine plan compliance. A compliance report shall be
<br /> research has been done to identify the origin of this ditch. Aerial photo Wetlands B and C, the applicant is proposing to route the culverted drainage 8. Oso-berry Oem. cerasiformis 1 gal(on 5' 64 supplied to the City of Everett to evatuate plan compliance and describe final shall be as described under PROJECT MONITORING AND MAINTENANCE PROGRAM �
<br /> interpretation was conducted by Dr. Frank Westerlund, Director of the ditch to a new stormwater conveyance channel and wetland creation area constructed details. induded in this plan.
<br /> University of Washington s Remote Sensing Application Laboratory. The between the detention pond and Wetland A. The stormwater conveyance
<br /> research condudes that the drainage ditch did not exist until State Route 526 channel will be approximately 760 feet in tength. A flow sptitter wilt be Quantity of one-gallon plants 520
<br /> WETLAND CREATION AREA PLANTINGS Sensitive area projects are typicalty more complex to construct than to
<br /> (SR526) and 80th Street SW were built. Stormwater from these roads was instatled at the end of the culvert to maintain hydrology in Wetland A and Estimated Cost of Plant Material and Installation Labor $6,500.00
<br /> directed onto the sub'ect arcel creatin the ditch which exists toda . The conve draina e to the new channel. The channel witl travel enerall The proposed wetland creation area is 4,976 square feet in size, located along describe in text. For greatest likelihood of success, a certified wetland
<br /> � p g y y g g y Estimated Cost of Consultant Oversight $5,000.00
<br /> ditch ftows into a wetland Wetland A in the northern ortion of the ro ert . northwest ickin u water from the detention facilit alon the wa and the north side of the proposed stormwater conveyance channel. The following professional shall periodically inspect the construction of the wetland, the
<br /> � � p p p Y ' p � P Y � y' list of native s ecies wilt be lanted within this area. stormwater conveyance channel, and the installation of plant material. Minor Earthwork $22,700.00
<br /> A smal( wetland (Wetland Bj lies south of Wetland A atong the ditch towards the ending in the northern portion of Wetland A, near Hardeson Road. P p adjustments to the original design may be required during construction. Total Estimated Bond Amount (300% of total above) $102,600.00
<br /> middle of the site. Another small wetland (Wetland C} lies north of Wetland A.
<br /> The new channel has been designed to carry the 100-year storm volume and Common Name Latin Name Size Saacing uantit
<br /> 1. Western red cedar Thuja p(icota 1 gallon 10' 8 Planting shall take place in the early spring or tate fall. Plants should be
<br /> Based on the non-natural history of the ditch, it does not meet the definition of witl have a natural, sinuous design to slow ftow velocities. It will vary between � obtained from a re utabte nurse All lant materials recommended in this USE OF THIS PLAN
<br /> a stream (EMC Title 19, 4.020 Stream ) and is exempt from regulation by the five and six feet in width with a smaller tow-flow channel within it. Seven 1. Pacific willow Solix lucido 1 gallon 10 8 p n'• P This Final Wettand Mitigation Plan is supptied to MTorres America, as a means of
<br /> Cit of Everett EMC Title 19 37.050 A 6 Wetland A is sli htl lar er than an sin le-lo rade control structures will be installed to revent erosion and the 2• Red-osier dogwood Cornus sericea 1 gatlon 10 8 plan are typically availabte from local and regional sources, depending on .
<br /> Y ( , ( )( ))• � y g 4 � � p determining on-site wetland conditions, as required by the City of Everett
<br /> acre in size and is dominated b forested ve etation, thereb meetin the otential for incisin Details of the ro osed stream rofile and rade control 3. Black hawthorn Cratoegus douglasii 1 gallon 5' 32 seasonal demand. Some limited species substitution may be allowed, only with
<br /> Y 4 Y � p �• p p p � during the permitting process. This report is based largely on readily
<br /> criteria for a Cate o II wetland classification in the Cit of Everett. Cate o structure are induded on Sheet 2 of this tan. The channel bottom will be 4• Twinberry Lonicera invo(utrota 1 gallon 5' 32 the agreement of the consutting biologist or city inspector. Care and handting
<br /> � ry y � ry P 5. Pacific ninebark Ph socar us ca itatus1 allon 5' 32 of plant materials is extremely important to the overalt suecess of the project. observabte conditions and, to a lesser extent, on readily ascertainable
<br /> II wettands are typically designated 75-foot protective buffers. Wetland B lined with gravels to provide wildlife and macro-invertebrate while atso adding y p p g conditions. No attempt has been made to determine hidden or concealed
<br /> (2,544 sq. ft.) and Wetland C (644 sq. ft.) are small and do not meet the friction to slow flow velocities. conditions. Reports may be adversely affected due to the physical condition of
<br /> criteria for Cate o I, II, or IV wetlands and are thereb classified as Cate o The plants shatl be arranged with the appropriate numbers, sizes, species, and the site and the difficult of access which ma lead to observation or robin
<br /> III wetlands. Ca e o III wetlands are t icall desi nat d 50-foot rotecti�very A 4 976 s uare foot wetland creation area is ro osed alon the north side of distribution to achieve the required vegetation coverage. The actual y � Y P �
<br /> 8 rY YP Y B P � 4 P P g GRASS SEEDING placement of individual plants shall mimic natural, asymmetric vegetation difficulties.
<br /> buffers. the stormwater conveyance channel to off-set the filting of Wetlands B and C. Any bare ground areas within the wetland or buffers after construction will be patterns found on similar undisturbed sites in the area.
<br /> The wetland creation area will receive hydrology from the new channet and seeded to the following grass seed mixtures. Fertilizer shalt only be used if The laws applicable to wetlands are subject to varying interpretations and may
<br /> will help attenuate flows, increase water quatity, and provide more diverse absolutel necessa due to otential runoff into sensitive wetland s stems. If be changed at any time by the courts or legislative bodies. This report is
<br /> Y �'Y P Y Ribbon flagging or other marking device shall be placed on or near each
<br /> wildlife habitat. Due to the low functions and values provided by Wetlands B deemed absolutel necessa b the consultin biolo ist and/or the cit intended to provide information deemed relevant in the applicant's attempt to
<br /> Y rY Y � � Y installed plant to assist in locating the plants while removing the competing
<br /> and C, wettand creation is proposed at a 1 .6:1 ratio. Dense native tree and inspector, an appropriate fertilizer will be recommended for the particular non-native vegetation and to assist in monitoring the plantings. compty with the laws now in effect. _
<br /> shrub plantings in the created wetland will provide a significant increase in probtem.
<br /> functions and vatues over that provided by Wetlands B and C, including Wood chips, or similar approved material, shall be used for mutching. Mulch The work for this report has conformed to the standard of care employed by
<br /> stormwater control, water quality, and wildlife habitat. Wetland Grass Seed Mixture wetland ecologists. No other representation or warranty is made concerning
<br /> shall be placed in a two-foot diameter around each planting at a depth of three the work or this re ort and an im tied re resentation or warrant is
<br /> Common Name Latin Name lbs./7,000 s.f. to four inches. Afour-inch diameter ring around the base of each plant shall be P y P P y
<br /> Both sides of the new channel are proposed to be enhanced with native trees Fowl meadowgrass Poo pa(ustris 0.8 kept free of mukh. t require mulch:- - -- disdaimed
<br /> and shrubs to off-set the 7,522 square foot buffer impact area. The planting Redtop bentgrass Agrostis a(ba 0.8
<br /> areas total approximately 16,000 square feet, a 2.1:1 mitigation ratio. The Meadow foxtail Atopecurus pratensis 0.2 ,
<br /> plantings will help diversify the habitat provide in this area and will assist in , r� 6 2 �
<br /> increasing water quality. Buffer Grass Seed Mixture �
<br /> Common Name Latin Name lbs./1,000 s.f. FINAL WETLAND MITIGATION PLAN
<br /> These mitigation measures will provide significant increases to the functions of Colonial bentgrass Agrostis tenuis 0.6 �OS1O" aueercwoRirs � Wet�aha'Re�oyrees,�hL; MTORRES AMERlCA
<br /> water quatity, stormwater conveyance and attenuation, and wildlife habitat, Annual ryegrass tolium mu(tif(orum 0.3 OfPARTMEM OHineation/Miti¢ationl0.esroration/HabitatCreationlPermitAssistance 905 80th St SW .
<br /> � � P y White ctover Trifo(ium repens �.2 9505 79th Avenue S.E. Suite 106 Everet[,Washington 98208
<br /> far outwei hin those rovided b current condition of the site. W�T� City of Everett
<br /> „ �a�� wo0.� PERNIf g Phone: (425) 337-3174
<br /> acQuirteo VRIOR TO Si�RTIqG Sh2Et 1/2
<br /> sewen r ANY �aNnR���� a� T� Fax: (425) 337-3045 MTorres America
<br /> ►RO]ECT. AVVROVAt FOR T115 EmaiL mailboxC�wetlandresources.com Job # 04436 �
<br /> ` �o,ER is mnomonnl �. 21520 30th Drive, Ste. 210 Drawn by: JL
<br /> CU0.REM CI'i SIAN� RDS AND
<br /> � � �..�-�- EznnEs �-�� �,�_.z�3vn�ss Bothell, WA 98021 Date: 06.13.2016
<br /> !lRMR Wll CONSTRUCTION IMS
<br /> GINEEs. BEEN[SSU[D.
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