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Home My WebLink About2001.09.00 - Hendricks and 30th Retention Basin Wetland Revegetation Monitoring Year 4I I 1 I I I I I l l l J J J J J J J Hendricks and 30th Street Retention Basin Wetland Revegetation Monitoring Year 4 2001 Prepared for City of Port Townsend l8l Quincy Street Port Townsend, Washington 98368 Prepared by Dixie Llewellin Olympic Wetland Resources, Inc. 856 50th Street Port Townsend, Washinglon 98368 Hendricks and 30th Street Retention Basin Wetland Revegetation M onitoring September 2001 Year 4 Contents I 0 Introduction 1.1 Project History 2.0 Methodology 2.I Project Goals and Objectives 2.2 Monrtoring Methods 2.2.1 Determining Survival Rates of Trees, Shrubs, and Emergents 2.2.2 Documenttng Wetland Changes With Photographs 2 3 Monitoring Schedule Table 1. Monitoring Schedule 3.0 Results and Discussron 3.1 Forested Survival 3.2 Scrub/Shrub Survival 3.3 Emergent/ Herbaceous Survival 3.4 Salvage Effort 3.5 Weedy Species 3.6 Action Items 4.0 Summary Appendix Figures I Monitoring Area and Photopoints il Tree and Herb Monitoring Form m Shrub Monitoring Form fV Salvaged Plants Monitoring Form Photopoints V Photopoints I and 2 VI Photopoints 3 and 4 VII Photopoints 5, 6a, and 6b I "i I I -.t \J Hendricks and 30th Street Retention Basin Wetland Revegetation Monitoring Year 4 2001 1.0 Introduction This report summarizes findings from the 2001 Hendricks and 30ft Street Wetland Revegetation Monitoring project. The purpose of this report is to document the compliance to performance standards established by the City of Port Townsend for revegetation projects. 1.1 Project History The City of Port Townsend constructed a stormwater retention pond in lggT nthe vicinity of a small depression wetland between 296 and 30m Street on Hendricks Street. A wetland delineation (May 1997) documented a 1,300 square foot Category III wetland, which received stormwater from up-gradient neighborhood areas. St. Herman's of Alaska Eastern Orthodox Church was built adjacent to this wetland and has collaborated with this revegetation project. Native wetland and upland plants were salvaged from the site prior to the construction and were re-planted on site about one year later. Native plants, grown as nursery stock were.also planted in addition to the salvaged plants. A phased planting schedule was implemented from 1997 to 1999. Through volunteer efforts, 64 trees, 250 shrubs, and over 170 herbaceous plants were planted in and around this retention basin 2.0 Methodolory 2.1 Project Goals and Objectives The goals of the Hendricks and 30ft Street Revegetation Project are to use native plantings to restore the functions and values of the wetland/retention pond buffers, and to restore the habitat value of the site by planting diverse vegetation in the tree, shrub, and herbaceous layers. Native vegetation, which is tolerant of our local climatic variations, was selected for re-vegetating the site. Priority was given to species already present on the site, thus creating continuity with the surrounding plant communities. Vegetation that was previously growing here, and had adapted to the site (hawhorns, willows, sedges, and roses) has been reintegrated through salvage efforts. 2.2 Monitoring Methods The site is small enough that each individual plant can be counted Individuals are categorized as tree, shrub, or emergent/herbaceous. Monitoring forms have been developed to record planting dates, plant survivorship, and condition of planted species. Survival rates for salvaged plants are evaluated separately to specifically examine whether this type of transplanting will be valuable for future projects. I Olltnpic Wetland Resources. lnc. Hendricks and 30ft Street Reveqetation Monitoring Report Year 4 September 2001 2.2.1 Determining Survival Rates of Trees, Shrubs, and Emergents Actual survival percentages were calculated by comparing the numbers of plants observed that were alive and healthy to the total numbers observed (dead or alive). These survival rates are listed on the monitoring forms for each of the plant communities. These forms are included in the Appendix (Figures II, ilI, and IV). 2.2.2 Documenting Wetland Changes With Photographs Six permanent photopoints were established to document the changes of the vegetation layer over time. A map showing photopoint locations and the direction photographs were taken is included in the Appendix (Figure I). Photopoints #1 through #4 consist of composites of pictures. Photopoints at the bioflltration swales and stormwater overflows are also included (# 5, #64 and #6b). Atl photographs are included in the Appendix (Figures v, vI, and vII). 2.3 Monitoring Schedule As per City of Port Townsend monitoring requirements, this site will be monitored annually for three years after final planting is complete Final planting was completed in 1999. Table I shows the status of the monitoring schedule: Table I M Schedule 3.0 Results and Discussion The revegetation monitoring goal is to determine whether the performance standards identified by the City of Port Townsend have been met. Perfonnance standards require that the site be dominated by a cover of 85o/o "desirable species" with less than l5o/o "weed species" 3 years after final planting. Survivorship of tree and shrub species is expected to be 80olo or greater 5 years after the final planting phase. All dead or dying plants should be replaced by the same species from the original planting plan during the appropriate season. All Scot's broom and reed canarygrass should be completely eliminated from the site. Monitoring forms for tree, shrub, emergent, and salvaged plants are included in the Appendix (Figures II through IV). Dixie Llewellin of Olympic Wetland Resources, Inc. collected data on August 6, 2001. A comprehensive count of all trees, shrubs, and emergent vegetation was completed. Species with zero survival rates were not included in the average. For example, madrona, which was re- planted on site in 1998 as part of the salvage effort, did not survive the fust year planting. It is an exceptionally difficult species to transplant and the mortality was not included in the computed 2 Olrmpic Wetland Resources. tnc. Hendricks and 30h Street Revegetation Monitoring Report Year.1 Monitoring schedule Fall 1998 Spring 1999 Fall 1999 Fall 2000 Fall200l Fall 2002 Vegetation and Habitat 10/98 8/99 8/00 8/01 Photopoints 10/98 8/99 8i00 8/01 Annual Report 12198 11/99 9/00 9/01 September 2001 average. Survival rates ofplants observed and survival rates ofplants planted are discussed in the following sections. 3.1 Forested Survival The survival rate of trees is 57o/o. [n the tree layer, shore pines have an excellent survival rate, all l0 planted remain healthy and vigorous. The mountain ash and maple are suffering from drought since the irrigation system was not activated at all in 2001. The remaining aspen are down in numbers from the original number planted due to vandalism; the two surviving trees are green and healthy and in time aspen will spread. Native populations of serviceberry are expanding and young plants were observed. 3.2 Scrub/Shrub Survival The overall zurvival rate of scrubs was moderate, at75Yo. [n general the twinberry, Indian plum, willow, hardhack, snowberry, hawthorn, rose and dogwood are adapting well to the site. They have had 10006 success rate when comparing numbers planted to numbers present. The dogwood appeared stressed (due to the dry year) but the plants were still alive. 3.3 Emergent/Herbaceous Survival Survival rate for most emergent species was good, at 88oh. Several planted species such as slough sedge, soft rush, water parsley, and hardstem bulrush are well'established and are reproducing with signs of vigorous new growth. As long as water is present these plants will dominate the pond area. The pond had only surface moisture during this survey whereas last year there was ponded water all throughout the summer months. All emergent species are dependant on the presence of water. 3.4 Salvage Effort The survival rate for salvaged plants varied according to plant type. Madrona, cherry, and sword fern did not survive the transplant. Shrubs had an excellent survival rate, at 96Yo and the emergentlherbaceous species had a good rate at 79o w:f'h spreading populations 3.5 Weedy Species Several non-native weeds, including Himalayan blackberry, curly dock, and thistle, have been identified on the site. Mowing or hand pulling these non -natives plants should be done twice a year to ensure the survival of the planted species. Scot's broom was not observed during the 2001 survey. The site was mowed in the fall of 2000 by Resource Renewal lnc but has not been maintained in the year 2001. 3.6 Action Items Weed site (Fall and Spring) Mow or weed-eat areas without plants (Annually) 3 Olmpic Wetland Resources. Lnc. Hendricks and 30h Street Revegetation Monitoring Report Yein 4 September 2001 1 I J 4.0 S'mmary The majority of salvaging, planting, and maintenance has been conducted by an all-volunteer work force. In 1998 the first phase of an irrigation system was installed, including main lines and hose bibs. In 1999 the drip irrigation was completed and was not activated until late August 1999 Irrigation was not working during the monitoring io August of 2000 and has not been used during the 2001 season. Many trees and shrubs were stressed due to the especially dry year and lack of water. Weeds covered many planted species. Weeding and watering are recommended for three years after final planting is complete (until 2002) The survival rate for planted species is declining from last year but is still good for the tree and shrub species. Survival rate for the emergent species found in or very near the pond is excellent due to lack of non-native plants and presence of surface hydrology. The pond has had standing water present at all times until this year. Although compliance with performance standards for revegetation projects is determined after five years, the fourth year progress report for this project is near the 85Yo zurvivorship requirement (trees 57Yo, sbrubsT7Yo, and emergents 88%). Ground cover in most locations is dominated by greater than 50Yo undesirable "weed species"; performance standards require less than I5Yo "weed species". We strongly recommend that the City organize volunteers, assign city stafi or contract the minimal maintenance that would ensure the surviwal of the existing vegetation planted on site. 4 Olvmpic Wetland Resources, Inc. Hendricks and 30h Street Revegetation Monitoring Report Year 4 ILJ September 2001 Figwes Appendix I Monitoring Area and PhotoPoints II Tree and Flerb Monitoring Form n Shrub Monitoring Form IV Salvaged Plants Monitoring Form Photopoints V Photopoints I and 2 VI Photopoints 3 and 4 VII Photopoints 5, 6a, and 6b 30th Street 1 I l Photopoint # 5 I 9AIAL Photopoint # 1 {BENCH WITH YINE9 int#4 Ee$B('Dngd6tflts9 #6a and b DRIVEh AY1O CHURCH ElE$l|*E L WAX lvf/KtlE r- OCEANSPRAY .\'z @ Ph nt#3 fiur l; fi{rG{t B@.'RMIffi RED \{i{sr{ r 1j .,J ".i .i+..(1 :1 tu#. lrto _..* l:h.j ,j.;r,i. 0lympic Uellond Rerour(er, lnc. 856 50lh Jtreel Porl lownrend, llA 98368 360 185-6432 Iille:Itolc !pel [)ofre: tlienl: lo[#: r' il'L[ry n8T 200r-00673Fol't 0l a:.i llendrickr Street Plonting Plon ond Photopointr Figure I IIHendricks and 30th Street Photopoints #I and#Z August 2001Photopoint #l East View From ChurchIOlynpic Wotland Resouces, Inc.Photopoint #2 Retention PondFigure V. I7I1Hendricks and 30th Street Photopoints #3 and ff4 August 2001Photopoint #3 North View From Top Of MoudOllmpic Wbtland Reowces, Inc.Photopoint #4 Wbst ViewFigure VI. r*-- t_ | r r Ll_Photopoint #5 Biofitfration SwaleOff30th SteetIHendricks and 30th Street Photopoints #5, #6a, and 6b August 2001Photopoint #6btlllllPhotopoint #6aOverflow to the eastO$mpic We{and Resources, Inc.Figure VII. }.lo/, I / 'ZI:eo Plor'-u'rw-f St{n 9l*mots 2.2.1 Determining Survival Rates of Trees, Shrubs, and Emergents Actual survival percentages were calculated using two methods. The first method compared numbers of plants observed against total numbers planted. The second method compared the numbers of plants observed that were alive and healthy to the total numbers observed (dead or alive). These survival rates are listed on the monitoring forms under totals. Monitoring forms for each of the plant communities are included in the Appendix (Figure [, [, and IV). 2.2.2 Documenting Wetland Changes With photographs Six permanent photopoints were established on site to document the changes of the vegetation layer over time. A map showing photopoint locations, and the direction photographs were taken, is included in the Appendix (Figure t). Photopoints #1 through #4 consist of composites of pictures. Photopoints # 5 and #6a,6b,6c, arc of the biofiltration swales and stormwater overflows. All photographs are included in the Appendix (Figure v, vI, and vtr). 2.3 Monitoring Schedule As per City of Port Townsend monitoring requirements, this site will be monitored annually for three years after final planting is complete. Final planting was completed in 1999. Table l. Shows the status of the monitoring schedule: Table 1. Moni Schedule 3.0 Results and Discussion The revegetation monitoring goal is to determine whether the performance standards identified by the City of Port Townsend have been met. Perfonnance standards require that the site is dominated by a cover of 85% "desirable species" with less than1,5% "weed species" 3 years after final planting. Survivorship of tree and shrub species is expected to be 80% or greater 5 years after the final the planting phase. All dead or dying plants should be replaced by the same species from the original planting plan dwing the appropriate season. Also all Scot's broom and reed canarygrass should be completely eliminated from the site. Data was collected on August 23,1999 by Dixie Llewelin of Olympic Wetland Resources, IncA comprehensive count of all trees, shrubs and emergent vegetation was completed. Species with zero survival rates were not included in the average. Madrona for example, is an exceptionally diffrcult species to transplant and no individuals survived; it was not included in the total average. Percentage survival rates of plants observed and survival rates of plants planted are discussed in the section following. Olympic Wetland Resources, lnc. Hendricks and 30s Street Revegetation Monitoring Report Year 2 Monitoring schedule Fall 1998 Spring 1999 Fall 1999 Fall 2000 Fall 2001 Fall2002 Vegetation and Habitat 10/98 8/99ffit Photopoints 10/98 8/99 Annual Report 12/98 tt/99 2 September 1999 Figure lV Salvaged Plants Returned to Hendricks and 30th Street Common Name Scientific Name Em Herbaceous ota Shrub Totals Tree €0)I Cd A (n t- V) o\ OOO.Otsg\o'ooO\O'OO*N(\lctrtrtr.i !!EE c)oc,e q, i ;;EYlEa)ooo(.)i;naahaatE A K A ? A? Observcr: D. Llewellin, Olympic Wetland Resources,Inc. Date: Auqust 6.2001 960h Figure IV Slough sedge Carex obnuptcr2/2U98 Juncus e//ususSoft Rush2t21198 Polystichum ntunilunt212U98Sword f'ern t7 17 20 20 l0 59%l0 2 100%2 2 4 42 0 0 0 IVo0I0 212v98 Hazelnut Corylus crtrnLtlu 2l2ll98 Douglas' hawthorn CralaeS4us dougiasii 212v98 Ocean-spray Holodiscus discolor 2l2ll98 Nootka rose Rosa nulkanct 2t2ll98 Scouler willow Salix scouleriuna 2l2ll98 Hardhack (Spirea)Spiraea douglu,rii 2t2ll98 Snowberry Symphoricarpos albus I I I 1 I 1 1000h l0 1l l0 10 l0 l0 9t% 4 5 1 5 4 4 80o/o 8 8 8 8 8 8 100% J J 2 a-t J J 100% 5 5 5 5 5 5 100% 4 4 J 4 4 4 100% 212U98 Madrona Arbulus menziel;ii 2l2ll98 Bitter cherry Prunus emarginala 0 2 0 0 0 0 IVo 0 J 0 0 0 0 0% Totals 88'h 00/, Monitoring 2001 Figure III Hendricks and 30th Street Vegetation Monitoring Form Shrub Common Name Scientific Name slU99 Oregon grape Berrberis aquifttlium * 51U99 Red-osier dogwood Cornus sericea* 5n6198 I{azelnut Corylus cornula** 97198 Douglas' hawthorn Crataeguls dougia,sii 97198 Ocean-spray Holodiscus discolor** stl/99 Black twinberry Lonicera involucralq* s/t/99 Indian plum Oemler ia ce ras ifbr ntis * sll199 Pacific nirrebark P hys ocarpus cap itcrtu,; * 5lt6198 Red currant Rihes sunxuineunt 2/2v98 Nootka rose Ro,,;u nutkttnu** 5ll6198 Scoulers willow Salix scouleriena sll6198 Blue elderberry Sambucus cerulect 5lt6198 Hardhack (Spirea)Spiraea douglu,rii 2/21198 Snowberry Symphoricarpos albu:; Totals shrub only * New species added to original planting plan. ** Total plant count includes both salvaged and nursery plants. () Cdp. d a O a.l C\ltrtr €!C)o t- l-()q).o&oo 00 0\O\ O\O\ O\ trtr €o(na()ka Observer: D.Llewcllin, Olympic Wetland Resources, Inc. Date: August 6,2001 Conrments 770 2 l0 8 2 l1 l0 8 8 4 4 5 8 J 8 5 4 20 N/A 16 2 2 1jYo Small plants surviving 10 N/A 9 l0 l0 100Yo Leaves turning brown, stems still alive 9 8 J 2 2 22%Dry All planted species alive, native populaion thrivingll10881l100% Plants becoming establishedl4t4147l071% Dry leaves8N/A 8 8 8 100% 4 100%Mostly healthy population, one plant 5'tall41I4 l0 8 4 50%Bushes becoming established8N/A l0 5 2 5 s0%Healthy and green10 8 7 8 8 I 10001n Spreading, many new plants aJ J aJ J J 100Yo Healthy and green One plant 6'tall, population becoming well establishedl01077880% Healthy and green55555100% 100%Many new youltg plants, population growing44444 Figure III Monitoring 2001 Figure II Hendricks and 30th Street vegetation Monitoring Form Date: August 6,2001 Observer: D.Llcwellin, Olympic Wetland Resources, Inc. Comments 570h (,'onrtnents .o (.) n l+i (d |< U) !ooo\oH*dA$RRF.=.trFiEEEE;€E * sA ##**$Planted Tree Totals Common Name Scientific Name nts/Herbaceous l0 4 50 20 Totals 7 4oh Two native species occuring in abu'dance in trre wet area are Bur_reed, * Total plant count includes emergent, shrub and trees 8g'A S1turganium en'tersLtm a,d spike_r'sh, EIeochari,s 1tarvula 7 5 2 7 l0 2 6 0 2 I 5/16/98 Vine cer circinalunt tU7te8 Servi Amelanchier qln t0 5116t98 Shore ne Pinu,y clnlorlqn/7t98 lremuloirJes t 1/7 /98 Bitter che Prunus emar tnalu 4/1/99 la I ia 411t99 Mountain aslr Sorbul;tn0 l2 4 l2 l0 7 58% 20 16 l3 7 7 35%ll 6 ll l0 l0 9t% 6 6 aJ 2 2 33%and Small trees under 2, Did not survive l0 l0 0 2 6 60% 2 N/A 2 0 0 3 N/A J I 2 67% 2/2U98 Slough sedge Carex ohn q 2121/98 Soft rush ,/uncus u,\ l0/22t97 !&!tr parsley 0enanthe ,\'ermenl0,tct 10122/97 Hardstem bulrush Scirpus aculus 20 t7 20 2 10 50%Not but heal 100%Present 100%but ton 100% 4 4 4 50 40 45 50 50 20 20 40 20 20 Total shrub 77rh Figure II Monitoring 2001