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Home My WebLink AboutApproved - Wetland Mitigation Plan September 26, 2014 AOA 4540 Rocale Timmons City of Renton - Current Planning Senior Planner 1055 South Grady Way Renton, WA 98057 rtimmons@rentonwa.gov REFERENCE: Whitman Court PUD SUBJECT: Monitoring and Maintenance Plan for Buffer Enhancement Dear Rocale, Following is the monitoring and maintenance plan from the drawings in report form. PART 1: BACKGROUND Scope of this plan includes portions within Tract A including the trail, fence and plant installation as depicted on this approved plan set (Final Buffer Enhancement Plan) dated 9/26/14. Areas outside of the planting locations are not covered under this plan and are part of the previously approved NGPA for the Ribera Balko Short Plat recorded on 4/9/2009. PART 2: FINAL ACCEPTANCE Upon completion of the planting, the Landscape Contractor shall provide AOA with a set of clearly marked prints designating the actual locations and quantities of plantings within the mitigation areas. Landscape Contractor shall keep a complete set of prints at the job site during construction for the purpose of "red-lining" changes or modifications to the approved plans and shall update said information on a daily basis. AOA shall approve planting locations. If items are to be corrected, a punch list shall be prepared by AOA and submitted to the Landscape Contractor for completion. After punch list items have been completed, AOA shall review the project for final acceptance of plan implementation. After acceptance has been obtained, Landscape Contractor shall provide as-built drawings to AOA of planted material. AOA shall visit the site upon completion of mitigation plan implementation and provide the City of Renton with written confirmation that installation complies with this plan. If AOA is unable to provide the City of Renton with such verification, an as-built wetland Rocale Timmons September 26, 2014 Page 2 mitigation plan shall be prepared by AOA and submitted to the City for review and approval. The date the City of Renton receives AOA written confirmation of installation pursuant to the final approved mitigation plan, they shall constitute beginning of the 5-year maintenance and monitoring period. PART 3: ONE-YEAR WARRANTEE MAINTENANCE As part of the construction budget for the project, the landscape contractor shall maintain the mitigation work during construction and for a period of one-year after construction. Maintenance shall be conducted according to Section 4 below and pursuant to Renton Municipal Code to clearly ensure that structures, improvements and mitigation perform satisfactorily for a period of 5 years. After warrantee replacements are completed by the Landscape Contractor, the remaining 4 years of maintenance shall be completed as part of the long-term maintenance and monitoring budget. PART 4: LONG-TERM MONITORING & MAINTENANCE SCHEDULE The monitoring and maintenance program will be conducted for a period of five years, with quarterly reports submitted to the City of Renton for the first year after construction acceptance and annual reports submitted for Years 2-5. Although the entire mitigation area will be reviewed, permanent vegetation sampling plots will be established at selected locations to incorporate all of the representative plant communities. The same monitoring points will be re-visited each year with a record kept of all plant species found. Vegetation will be recorded on the basis of relative percent cover of the dominant species within the vegetative strata. Photo-points will be established from which photographs will be taken throughout the monitoring period. These photographs will document general appearance and progress in plant community establishment in the enhancement area. Review of the photos over time will provide a visual representation of success of the mitigation plan. PART 5: GOAL, OBJECTIVES AND PERFORMANCE STANDARDS FOR MONITORING The primary goal of the mitigation plan is to increase the buffer functions over current conditions. To meet this goal, the following objectives and performance standards have been incorporated into the design of the plan: 5.1 - OBJECTIVE A Increase the structural and plant species diversity within the mitigation area. 5.2 - PERFORMANCE STANDARD FOR OBJECTIVE A Following every monitoring event for a period of at least five years, the mitigation area will contain at least 8 native plant species. Following each monitoring event, there will Rocale Timmons September 26, 2014 Page 3 be at least an 80% survival rate of all initially planted tree and shrub species or equivalent replacement of a combination of planted and re-colonized native species. 5.3 - OBJECTIVE B Limit the amount of invasive and exotic species within the mitigation area. 5.4 - PERFORMANCE STANDARD FOR OBJECTIVE B After construction and following every monitoring event for a period of at least five years, exotic and invasive plant species will be maintained at levels below 15% total cover in all planted areas. These species include, but are not limited to, Scot's broom, Himalayan and evergreen blackberry, reed canarygrass, morning glory, Japanese knotweed, English ivy, thistle, and creeping nightshade. PART 6: LONG-TERM MAINTENANCE SPECIFICATIONS Maintenance will be conducted on a routine, year round basis. Additional maintenance needs will be identified and addressed following a twice-yearly maintenance review. Contingency measures and remedial action on the site shall be implemented on an as- needed basis at the direction of the wetland consultant or the owner. 6.1 - WEED CONTROL Routine removal and control of non-native and other invasive plants (e.g., Scot's broom, reed canarygrass, Himalayan and evergreen blackberry, Japanese knotweed, English ivy, morning glory, thistle and creeping nightshade) shall be performed by manual means. 6.2 - IRRIGATION The owner shall ensure that all plants are irrigated from June 1 through October 31. During the first year after installation, irrigation should occur at a rate of 1/2" of water two to three times a week. During the second year after installation, irrigation should occur at a rate of 1/2" of water once a week. However, if more than 10% of plant replacement occurs, watering rates should be maintained at 1/2" of water twice a week. 6.3 - MAINTENANCE OF TREES Routine maintenance of planted trees shall be performed. Measures include resetting plants to proper grades and upright positions. Tall grasses shall be weeded at the base of plants to prevent engulfment. Weed control should be performed by; hand removal, installation of weed barrier cloth with mulch rings, or selective weed-whacking. If weed- whacking is performed, great care shall be taken to prevent damage to desired native species either planted or re-colonized. 6.4 - PRUNING OF WOODY PLANTS Woody plants shall only be pruned at the direction of the wetland consultant or to remove pest infestations (i.e., tent caterpillar). PART 7: CONTINGENCY PLAN All dead plants will be replaced with the same species or an approved substitute species that meets the goal of the mitigation plan. Plant material shall meet the same specifications as originally-installed material. Replanting will not occur until after reason Rocale Timmons September 26, 2014 Page 4 for failure has been identified (e.g., moisture regime, poor plant stock, disease, shade/sun conditions, wildlife damage, etc.). Replanting shall be completed under the direction of the wetland consultant, City of Renton, or the owner. If you have any questions, please contact me at (425) 333-4535 or email me at simone@altoliver.com. Sincerely, ALTMANN OLIVER ASSOCIATES, LLC Simone Oliver, LA Project Manager cc via email: Paul Ebensteiner