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HomeMy WebLinkAboutWetland Buffer Restoration 977700041 I I I I I I I I I I I I I I I I I I I WETLAND BUFFER RESTORATION PLAN FORA 1 ACRE PARCEL AT 314 MERRY ROAD NORDLAND WASHINGTON (Tax Parcel No. 977 700 041) lRE(~EIVEn JAN 0 0 '1f'H'l7 I U Lull Prepared For: Wilber Judycki 5311 West Arlington Street Yakima, W A 98908 ,JHff>>~U1v&UUNI~ utU Prepared by: :,L ~."=' .=~ .~t4 Wiltermood Associates, Inc. 1015 SW Harper Road Port Orchard, W A 98367 (360) 876-2403 December 26, 2006 I I I I I I I I I I I I I I I I I I I INDEX INTRODUCTION PAGE 1 WETLAND AND BUFFER CONDITIONS 1 RESTORATION PLAN OVERVIEW Objectives of the Restoraion Plan Goals of the Restoration Plan Planting Plan Specifications 2 2 2 2 PERFORMANCE STANDARDS 4 MONITORING PLAN 4 MAINTENANCE PLAN 5 CONTINGENCY PLAN 6 PERFORMANCE BONDS 6 ATTACHMENTS Wetland Delineation and Buffer Clearing Map Buffer Restoration Plan Drawing I I I I I I I I I I I I I I I I I I I INTRODUCTION This wetland buffer restoration plan has been prepared for a 1 acre site located at 314 Merry Road in Nordland, Jefferson County Washington (Tax Parcel No. 977700041). The restoration is being completed because a portion of a Category II wetland buffer was cleared of vegetation. The site was visited on December 15, 2006 and the wetland edge was identified and delineated to determine the amount of buffer that had been cleared. It was determined that an area of approximately 2,351 square feet was cleared on the outer edge of the wetland buffer. See attached drawing of site. The area that was cleared appears to have been dominated Scoulers willow and possibly grand fir and Douglas fir with a sparse shrub layer of ocean spray and salmonberry and a thick herbaceous layer of sword fern. Jefferson County has requested that a buffer restoration plan be prepared in order to regenerate the wetland buffer so that the area may continue to provide water quality, run off infiltration and a sound and sight barrier to the wetland. This restoration plan proposed to restore approximately 2,351 square feet of wetland buffer that has been cleared of native vegetation. Monitoring will be required for a period of three years to ensure that the plants survive and grow to create a diverse tree, shrub and herbaceous buffer community that protects the wetland from possible future development. Maintenance will be necessary to ensure survival and good growing conditions and will entail removal of non-natives/invasives and watering on a regular basis during the summer months. Three performance standards will be used to gauge the success of the restoration plan and they will include at least 90% survival of all the installed plants, less than 15% cover by non-natives/invasives during each year of the three year monitoring period and at least 60 % cover by the installed plants by the end of the three year monitoring period. WETLAND AND BUFFER CONDITIONS The parcel is currently undeveloped and is composed of a depressional Palustrine Forested/Scrub Shrub Category II wetland that lies across south end with an intact moderate aged coniferous dominated forested buffer (excluding the area that was cleared) running through the center of the property. The north end of the property was cleared in preparation for a possible home site, which never materialized. The lot is surrounded to the north by Merry Road, to the east and west by similar sized lots containing single family residences and to the south by off site portions of the Category II wetland. It appears that most of the on site portion of the wetland is forested with a tree layer dominated by red alder and western red cedar. The shrub layer in the forest is dominated by salmonberry with lower percentages of western crabapple and Sitka willow. The herbaceous layer is dominated by slough sedge with lower percentages of water parsley and lady fern. The wetland appears to receive most of its hydrology via upland runoff collection and it is a depressional basin that is collecting this runoff. I I I I I I I I I I I I I I I I I I I The vegetated wetland buffer on the site is composed of a tree layer dominated by Scouler's willow, grand fir, western hemlock, western red cedar, Douglas fir and red alder. The shrub layer is dominated by salmonberry and ocean spray. The herbaceous layer in the forested buffer area is dominated by sword fern with lower percentages of trailing blackberry. The cleared buffer area has overhanging vegetation of the above mentioned composition with the shrub and herbaceous layers cleared. It appears that the area was seeded with a grass mix and creeping buttercup has gotten a foothold in the cleared and mowed areas. RESTORATION PLAN OVERVIEW The wetland and buffer restoration plan proposes to install native shrubs and herbaceous vegetation in clumps with trees intermixed to emulate natural vegetative conditions. The restored area will be located in the area that has been cleared within the 100 foot required natural vegetation buffer for the Category II wetland that encompasses the south end of the lot. The cleared area is within the eastern outer 50 % of the buffer and is irregular in shape, totaling approximately 2,351 square feet. Maintenance is proposed to keep the cover of non-native invasive species in the restored areas as low as possible in order to ensure the plants grow without hindrance. Watering during the summer months will also help the installed native plants to become established during the monitoring and maintenance period. Objectives of the Restoration Plan The objective of this restoration plan is to replace the vegetation removed during recent clearing activities with native buffer vegetation that will provide improved buffer conditions and an attractive amenity to the site. The vegetation will resemble a forested community with shrub and herbaceous vegetation in the understory once it has matured. Goals of the Restoration Plan The goals for plant installation will be 90% survival rate among the native plants, at least 60% cover by native vegetation in the buffers and less than 15 % cover by non-native plants including Himalayan blackberry, Scot's broom and English ivy. The survival rate and non-native plant cover standards are expected to be met every year of the three year monitoring period while the 60 % cover standard will be met by the end of the required three year monitoring period. Planting Plan and Specifications The plants chosen for this restoration plan are native to Marrowstone Island and are known to inhabit the site already. The plants as listed below and shown on the restoration drawing (attached) shall be obtained from regional native plant nurseries and will be installed in clumps to emulate natural wetland and buffer conditions. The clumps will consist of 6-12 individual plants to be spaced 5-7 feet apart. Plant installation should take place during the dormant season between October 15th and March 151\ to ensure the plants 2 I I I I I I I I I I I I I I I I I I I get a good start in the spring when water and temperature levels are optimal for growth. Plant installation can also take place during the spring and summer provided the plants are regularly watered after installation. Deciduous plants shall be at least 24 inches tall and in 1 gallon pots. Conifers shall be at least 24 inches tall and 1 gallon potted or bareroot individuals. In general, the plants will be laid out randomly by hand in their respective clumps and not measured out by string line. The plants will be installed by digging a two to three foot diameter hole and placing the plug from the pot into the ground once the soil around the pl~g is loosened. The hole will then be backfilled with the dug out soil and loosely packed down around the plug. Substitutions may be necessary for species or individuals that cannot be found at local nurseries and all plant substitutions shall be approved by the project biologist prior to installation. See Detailed Buffer Restoration Plan for location of plants in the buffer. Plant Common Name Botanical Name Plant size # 20 Sword fern Polystichum munitum 1 gal 10 Red Osier Dogwood Cornus sericea 1 gal 10 Western Red Cedar Thuja plicata 1 gal 12 Grand Fir Abies grandis Min 24" 10 Douglas Fir Pseudotsuga menziesii Min 24" The project biologist will be on site prior to and during the plant installation phase to verify that the species, quantity, and sizes of the plants are of the correct species or the approved substitutions have been made and that the plants are healthy and free of disease. The biologist will be able to help place the plants so that they are in the appropriate locations. Each of the plants will be flagged for easy identification and to indicate their presence during future maintenance activities. While conducting the on-site inspection of plants, the biologist shall identify and flag any existing native shrubs or trees in the restored wetland buffer area that will be saved and considered part of the mitigation plan. Also the biologist will identify areas in which non-native plants will be removed by the root as part of the maintenance of the buffer planting plan. An as/built will be prepared by the biologist after the planting has been implemented that documents the date of the planting, how it was implemented, and where the photo stations will be located. Baseline photos will be provided in the as/built. 3 I I I I I I I I I I I I I I I I I I I PERFORMANCE STANDARDS The performance standards have been developed to monitor the success of the installed plants with respect to the survival of individuals and percent cover provided by the installed plants by the end of the five year monitoring period. The following performance standards have been developed for the Judycki Restoration Plan: Years One through Three: · 90 % survival of planted species within restored buffer areas. · Less than 15 % cover by non-native exotics, including but not limited to English ivy, Himalayan blackberry, and Scot's broom By End of Year Three: · At least 60 % cover by native installed or volunteer plants within the restored area. MONITORING PLAN The monitoring plan has been prepared so that it can be conducted by the current owner or by a biologist. Monitoring will occur for a period of three years following installation of the plants to track the success of the project and to ensure that the performance standards are met. Monitoring should take place at the end of each summer (August or September, which is considered the end of the growing season) so that the plants have had a chance to grow fully. Survival rate and percent cover of installed plants will be monitored in the respective restoration area because they are relatively small in area and the restoration does not entail installation of significant numbers of plants. Performance Standard Ht-Survival Rate-Survival rate will be determined by counting the number of live plants and dividing by the number of plants originally installed (per design and as built), which will give a percent survival rate. Performance Standard H2-Percent Cover-The percent cover standard will be monitored as if looking over the restored area from above and estimating the areas covered by the individual species. To determine the percent cover easily, the restoration area can be divided into quarters and the amount of area covered by each native plant species (installed or volunteer plant) estimated within each quarter. The cover within each quarter can then be added together and divided by 4 to determine the average cover within the restored area. The percent cover within an area can total greater than 100 % because of the overlap in plant cover provided by the tree, high/low shrub and herbaceous layers. The percent cover can also just be roughly determined for the entire area without dividing it. 4 I I I I I I I I I I I I I I I I I I I Year 1: Year 2: Year 3 20-30% cover by installed and volunteer native plants 30-40% cover by installed and volunteer native plants 50-60% cover by installed and volunteer native plants Performance Standard #3-Cover by Non-Natives-The cover by non-native plants, which on this site will include English ivy, Scot's broom, and blackberry, should be kept below 15 %, which is why regular maintenance is required. The cover by these species will be determined through the same process as determining the cover of installed plants. If the percent cover by non-native is too high, more intensive maintenance must be conducted. The monitoring phase of the project will begin upon submittal and acceptance of the as built report, which will show the location of the plants installed using photos and hand drawn maps, upon completion of plant installation, The as built drawing will then be used in the three year follow up monitoring to track the changes in vegetative cover and document the survival rate of the plants installed as part of the restoration plan. The entire restoration area will be monitored and no individual sample plots will be established. Photos will be taken of the restoration area to provide visual documentation of the changes that occur over the three year monitoring period. The as built report will be submitted to Jefferson County Department of Community Development within a month of implementation. Monitoring at the end of the growing season will document the maximum growth and survival of the individual species. Photos will be taken of the restoration area from several different points during each monitoring visit to visually document the overall appearance of the restored buffer. These photos should be taken from roughly the same locations each year to show the same areas of restoration over the entire monitoring period for comparison purposes. The photos and data collected in the restoration areas will be. compiled into a short report and submitted to Jefferson County DCD to verify the restoration plan is developing as designed and is meeting the performance standards. The report will address whether the restored buffer performance standards are going to be met by the end of the three years and whether or not contingency measures will be needed. MAINTENANCE PLAN The restored buffer shall be maintained throughout the growing season of each monitoring year to increase the survival of the plants, particularly with respect to providing water during the summer months and clearing of invasive species. Hand clearing should be done around the individual plants because it will reduce the impact to the planted stock. Hand clearing and mowing will be necessary at least two times during each growing season to ensure the weeds and grasses do not hinder the growth and development of the scrub/shrub 5 I I I I I I I I I I I I I I I I I I I buffer community. The presence of any other native shrub or tree species (salmonberry, willows, lady fern, sword fern, etc.) not specifically planted in the wetland and upland shall be considered part of the restoration planting plan and will not be removed, unless they begin to compete and cause widespread die-off of the installed plants. Watering of the planted vegetation may be necessary during the drier portions of the year to ensure plant success and can be done by hand or sprinklers. Fertilization of the installed plants, using slow release tablets or spikes, may be necessary to initiate growth and provide nutrients that are not necessary present in the soil. Broadcast fertilizers shall not be used because they could impact water quality. CONTINGENCY PLAN Although the success of the restoration plan is not ensured, it is likely to succeed because of the size and scope of the project and that the area has non-compacted soils and has a tree canopy providing shade. If for some reason the survival rate is less than 90 %, plants that did not survive will be replaced with the same or a similar native species with the approval of the project biologist. Replacement will occur in the dormant season immediately following the growing season in which less than 90% survival was recorded. If at the end of the third monitoring year, the vegetation does not cover at least 60 % of the restored areas, additional plants may need to be installed. Maintenance activities will be continued for those replaced plants to ensure their survival. Monitoring may be extended by another year if the contingency plan is required. PERFORMANCE BONDS A performance bond (surety device) may be required by Jefferson County to ensure fulfillment of the compensation project, monitoring program and any contingency measures. The bond amounts below are determined by estimating the cost of the plants and labor to install them, the cost to complete the as built letter to let the city know that the restoration plan has been implemented, and the monitoring/maintenance costs. There are two performance bonds. The first covers implementation of the restoration plan and will be released following submittal and acceptance of the as built by the County. The second covers maintenance and monitoring and will be released upon acceptance of the final monitoring report by the County. The totals for each performance bond are based on the figures for the services listed below and multiplied by 125 percent, as required by Jefferson County. 6 I I I I I I I I I I I I I I I I I I I Performance Bond-Implementation 62 containerized plants- labor included (based on native plant nursery price list as per planting specs) Cost for supervision of project biologist Supervision of plant installation As-Built design and letter TOTAL FOR IMPLEMENT A TION PHASE TOTAL X 1250/0 FOR IMPLEMENTATION BOND Performance Bond-Monitoring Year One Monitoring Year Two Monitoring Year Three Monitoring Maintenance Bond (Twice per year) Year One Maintenance Year Two Maintenance Year Three Maintenance TOTAL FOR MONITORING AND MAINTENANCE PHASE $496.00 $180.00 $450.00 $1,126.00 $1,407.50 $630.00 $630.00 $630.00 $600.00 $600.00 $600.00 $3,690.00 TOTAL x 125% FOR MONITORING AND MAINTENANCE BOND $4,612.00 7 ------------------- .... 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