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HomeMy WebLinkAboutLUA 09-099 & 09-100_MiscDenis Law·. • Ma)'or· May 15, 2013 Aaron Kopet ·camwest · Departme·nt of C~mmunity and Economic Development (£"Chi p"Vi ncent, Administrator 9720 NE 120th Piace, Suite 100 Kirkland, WA 98034 · Subject: Appro~al of F,inal Mitigation Pia~ and Remaining Steps for Proc~eding East Renton/Rosemont Final Plat · . File No. LUA09-100 (L02POOOS) Dear Mr. Kopet: Mitigation Plan Approval: We have reviewed and appro~ed the finalwetla~d mitigation plan/monitoring proposal for East Renton/Rosemont. Plat;.received ·by the City ·on May 3, 2013. ·Additionally, you have provided an instaUation·surew in the amount of $23,on:oo in order to . . . guarantee the installation of the mitigation project. Next Steps: Begin work o_n wetland mitigation installation consistent with the:approved plan. · .· Mitigation Installation arid.Approval: Once t~e mitigation project-has beeri'installed (plants, . signage'. fen~ing, et~.) pursuant to the approved plan, ple1se have:your w~tlands specialist . · provide me with.viditten verification.that the installation is in conformance with the approved plan. · · · ' · · As.Built PlansJorthe MiUga~ionArea: A copy of the as-built plans of the mitigation project. iihallbe provided if any field chang~s are made. · · · ' · -. . . . . -. . . . . . M~nitoring and Mainte~ance Surety Amount: In order to· provide you ~ith the amount of security necessary for the maintenance and monitoring of the mitigation plantings,.signage, and fencing; we will need a copy of the.signed maintenance· and monitorin·g contract for this ·work. A· draft (fo.llowed by a fihal) maintenance and monitoring contract (or confracts) for our review prior to execution of the contract shall be provided. The draft contract language must ensure compliance with all performance standards of.the approved Sewall Wetland' Consulting, Inc .. mitigation plan as weU the.maintenance and monitoring standards of the Renton Municipal Code. The scope ofthe contract must clearly cover the cost of plant maintenance and replacement as well: The language in the contract must also guarantee that "structures, . improvements, and mitigation perform satisfactorily for a pericid of 5 years" (e,g: ·add provisions for plant replacement arid weed removal referencing compliance with the survival rates noted .. in the final approved wetland mitigation plan. The draft contract must be followed upwith a . final signed contract once the City approves the draft version .. Once the City approves the '' . . . ·. . . Renton City Hall • 1055 South Grady Way • Ren;on,Washirigton 98057 • rentonwa.g~v . ' . . . . • • coniract proposa,l,the applicant will need to provide a maintenance surety device,(a letter~! credit or irrevornble set aside letter) setat an amounttotalin'g 125% of the costto guarantee satisfactory perforrnance for a ~iniriium of five years. Tlie performance surety device shall be pr~vided prior to buildi~g permit appr6val. ' •. . · · · · . . · . ~onitoring and Mai~tenance Period Start ~ate: Once the mitigation proje~t has be~ri ·_ . installed, please provide me v.iith thJ wetland consultant;s ·writte~ i:onfirr:nation ofinstaiiaticin pursuant tcj the final approved mitigation plan. The date the City receiv_es this written . confirmation of the installation aiong with the maintenance and mo:nitoring surety device it will constitute the beginn_ingofthe minimumS'year maintenance and.monitoring period. . . ' . . ' "' . . . -. .. , Please send aU mitigation-related ;nfoimation to my attention. F.e~I free lo contact_rne at 425· . 430-72i9 if y~u have any q~estions regardi~g this letter .. . . . . . . . . . •' ·, Sincerely, j~- . -Senior Planner . cc: File LUA09-ioo, PP, ECF . r ,, • • I I ·---.. -~--...... .-...- . l• ., I ;, ~ ~ ~ ! w 0 ~ • ,, I il1 ~f!r! Iii ~ ,il m 1! .. I I f!~ 111 1,! h' ii! m 1! .. 1! 1! .,,. .. ~ 1! .. 1! .. i • ' l ' ' ' ' ! ' • • • j ' j • ' ' ' ' ' ' ' ' ' ' •' ' •. "'l' r----... ... ~\:!HI! 31NOW3S,, / N01N3H 1Slf3 J-----l1u1: ~~I " ., ,11 ' lo "I • ~ ., /f-;~ H ;; .lN3Wd013A30 .1S3MWtf.? !j . 1p1 "1 ~ S1ltf.130 i' S3.10N ~NUNY1d .1N3W3:JNYHN3 l/3:J:JnS i>.11 ...... 11111 ... I IS : I • ! ' !1 i ., I • I!! ,u ' • " l'Hj IH1 • '1!1 ~ • !hi! i''! I ,1 ~ • ,., '!'·II ~ ,ll 1 ,, !! ~ 1.,1 < !!!11 11 !1 1!1! ~ 11!11 l'l!P 1!1! ~ ill! • illtit ,Li!. ~ miil ~ ,!.!, .I ' !., ~ ~ • ~ ~ < ~ • re i ! t 1 u ~ l ~ i ~ l ~ ~ ~ ~ i i " ' " . " . w .__ • "'~ w .. ~ : "'ell " • " 0 ! < g w ~ • w : " • 0 « 0 • •-_u_.., ___ _,,.'°'.,,__, ~N·f .......... - ··' -· ·--·-·· ... •·· ,. -· • • 11 'J 2013 Mitigation Standards/Monitoring Program/Maintenance~CfoW"~© This wetland buffer mitigation section is provided as a supplement to the East Renton/Rosemonte Wetland Buffer Mitigation Plan (Sheets WLI -WL3, Triad Associates 8-11- 08). The supplement includes the typical components of a final mitigation plan including maintenance and monitoring programs. The intent of the Plan is to facilitate reasonable development of the East Renton/Rosemonte project and also improve and restore wetland buffer conditions. In addition to planting native plant species, non-native invasive plants will be removed. As part of the allowed wetland buffer averaging, the Plan targets an increase in wetland buffer functions with restoration and enhancement plantings. MITIGATION GOALS • Enhance and improve existing wetland buffer functions by adding species diversity and structure with new trees and shrubs. • Remove invasive & non-native species in enhanced wetland buffer areas. • Restore temporary impacts to the wetland buffer with native vegetation. • Preserve & maintain areas of enhanced & restored wetland buffer. PERFORMANCE STANDARDS • Provide enhancement ofat least 34,776 square feet of wetland buffer area within Tract F. • Restore all disturbed areas in the wetland buffer related to project construction activities. • Establish at least 6 native tree species and 12 native shrub species in the buffer. • Provide 80 percent survival of all installed trees and shrubs by the end of the 5 years of monitoring. • Maintain less than IO percent non-native, invasive plant cover in planted areas by the end of the 5 years of monitoring. PERFORMANCE SECURITY Per the City's sensitive areas code, a performance security or other instrument is required to guarantee mitigation success. Generally, the costs that are associated with installation, maintenance, and monitoring are used for performance security. Actual costs may vary depending on several factors, including; I) source of plant material, 2) site preparation work, 3) contract landscaper, and 4) consultant hired for monitoring. An estimated cost or use of contract bids for mitigation enhancement work may be used to determine a performance security. ---. /dte~?&YM~·Pt~riay provide a bond worksheet calculation method to determine security. Plann;n . _l!X(})JlJJ. 8 ~[fJ){p)ij D1v1sion By (Q) W7ta)) Date .!.12,-~ ~ • • The Project Ecologist's role is to oversee implementation of the Plan and to insure that all specifications are met. The Project Ecologist will observe site preparation and planting phases. Construction oversight will be provided for the removal of invasive, non-native plants and the protection of existing vegetation to remain. COMPLIANCE MONITORING The landscape contractor will notify the Project Ecologist and project proponent when planting has been completed. At that time, the ecologist will review the Plan and completed mitigation areas to assess compliance. Locations of installed trees and shrubs that differ from the approved planting plan will be noted or mapped. A report of compliance, including any deficiencies and resolutions, will be prepared for the City. Assuming installation occurs in 2013, the first compliance-monitoring event would occur late in 2013 or early in 2014 to verify complete plan implementation. Subsequent monitoring, reporting, and maintenance will follow the Monitoring Program during the 5 years following installation. Landscape contractor is responsible for plant installation and maintenance during the first full year after the approved installation. MONITORING PROGRAM An ecologist (qualified wetland/stream professional) will monitor the mitigation areas for at least 3 years following installation. Observations of the wetland buffer enhancement plantings will be made early in the growing season (5/1 to 5/30) and end of the growing season (9/1 to 9/30) for the first two years and annually during the last three years of the five-year monitoring period.· At the beginning of the growing season during the month of May, monitoring will include a maintenance review as follows: • Identify significant cover of weed, by species, and .schedule appropriate maintenance or removal in order to promote the growth and survival of all installed plants. At the end of the growing season during the month of September, monitoring will be as follows: • Count all installed trees and shrubs in the mitigation area for mortality/survival. • Assess the health of all installed trees and shrubs in the mitigation area for any potential disease, infestation, or animal damage. • Identify weed growth, by species and percent cover, and if maintenance is necessary for plant survival. · • Photograph the restored/enhanced buffer area from at least four locations. The location and direction of each photograph shall be consistent among monitoring periods, be representative of restored and enhanced areas, and be represented on a map (i.e., properly located and labeled). Submit the results of annual monitoring to the City within 30 days following field monitoring. -· -.. • • CONTINGENCY PLAN At the direction of the Project Ecologist, the proponent (owner) will replace all trees and shrubs that are dead or dying each year during the 5-year monitoring period. Should the desired mitigation goals and performance standards not be achieved, a determination will be made by a City representative, the Project Ecologist, and the project proponent to implement a contingency plan. The ecologist will evaluate the repeated failure and make recommendations to the City. Potential contingency is two-fold, including (!) to replace plants that have not survived at acceptable performance standards during the 5-year monitoring period, and (2) to detennine and rectify the cause of significant mortality (50 percent or. greater) of any mitigation area or plant species. Plan design and implementation will proceed with County approval, and if needed, additional maintenance and monitoring. MAINTENANCE Maintenance will be conducted on a routine, yearly basis for 5 years following installation. A need for maintenance will be evaluated by a qualified professional. The Monitoring Program's schedule will assure maintenance and success criteria are accomplished prior to or at the end of the mitigation period. Contingency or remedial measures will be implemented on an as-needed basis at the direciion of the Project Ecologist or County representative. Maintenance of the wetland buffer enhancement areas include the following: • Water tl,e new plantings weekly from July I through September 30, or as needed, during the first and second years after the plants are installed. • Remove weeds for 5 years after installation. Weed maintenance shall occur prior to June I on a yearly basis. Weeds may include non-native vegetation such as Himalayan blackberry (Rubus discolor}, reed canarygrass (Pha/aris arundinacea), evergreen blackberry (Rubus /aciniatus), Scot's broom (Cytisus scoparius),English ivy (Hedera helix), morning glory (Convo/vulus arvensis), Japanese knotweed (Polygonum cuspidallun) etc. • Replace tree and shrubs, with same as specified in this Plan, that die within 5 years after installation on a yearly basis. Maintenance is to be provided by project's Landscape Contractor for one year following construction / installation that begins at final acceptance of the Plan. To maintain the healthy growth of trees and shrubs, the following actions may be required: repair tree stakes, re-set plants to proper grade, control invasive plants, and provide adequate water application through the first growing season. Tree stakes will be removed at the end of the first-year maintenance period. C. Gary Schulz Wetland/Forest Ecologist 206-772-6514