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HomeMy WebLinkAbout2002.07.00 - Hendricks and 30th Retention Basin Wetland Revegetation Monitoring Year 5Hendricks and 30th Street Retention Basin Wetland Revegetation Monitoring FinelReport Year 5€lrly zooz prt 5 S'^*- Prepared for: City of Port Townsend Waterman & Y''av' Building 181 Quincy SteeL 2od Floor Port Townsend,'WA 98368 Prepared by: DixieLlewellin Olympic Wetland Resources, Inc. 856 50th Sfieet Port Townsendo WA, 98368 Olympic Wetlond Resources' lnc. 360 dllewell@olymPus.net Hendricks and 30th Street Retention Basin Wetland Revegetation Monitoring Final Report Year 5 July 2002 Contents 1.0 Introduction 1.1 Project History 2.0 Methodology 2.1 Project Goals and Objectives 2.2 Monrtoring Methods 2.2.1 Determining Survival Rates of Trees, Shrubs, and Emergents 2.2.2 D ocumenting Wetland Changes with Photographs 2.3 Monitoring Schedule Table l Monitoring Schedule 3 0 Results and Discussion 3. 1 Forest Survival 3.2 Scrub/Shrub Survival 3.3 Emergent/flerbaceous Survival 3.4 Salvage Effort 3.5 Weedy Species 4.0 Summary Appendix I Monitoring Area and Photopoints tr Tree and Emergent Monitoring Form m Shrub Monitoring Form IV Salvaged Plants Monitoring Form Photopoints V Photopoints#1, #2, al;id#3 VI Photopoints #4, #5, and #6 Figures Hendricks and 30th Street Retention Basin Wetland Revegetation Monitoring Final Report Year 5 July 2002 1.0 Introduction This report summarizes findings from2002 of the Wetland Revegetation Monitoring project at Hendricks and 30ft Street. The purpose of this report is to document compliance to perfonnance standards established by the City of Port Townsend for revegetation projects. This is the final year of monitoring and this is the final report. 1.1 Project History The City of Port Townsend constructed a stormwater retention pond (1997) between 296 and 30tr Street on Hendricks Street in an area that was once a small Category III wetland (delineated May 1997). St. Herman's of Alaska Eastern Orthodox Church was built adjacent to this wetland and part of their stormwater plan was collaborated with the City. Native wetland and upland plants were salvaged from the site prior to the excavation of the engineered storrnwater retention pond; these plants were returned to the site about one year later. Native plants grown as mrrsery stock were also planted in a phased planting schedule (1997 to 1999). During numerous volunteer work parties the church, the City, and nearby neighbors planted 64 trees, 250 shrubs, and over 170 herbaceous plants. Monitoring has been conducted annually since the planting began (1998) and 3 years past the final planting (1999) to evaluate the success ofthe planted species, salvaged plants, and nursery stock. 2.0 Methodology 2.1 Project Goals and Objectives The goals of the Hendricks and 30ft Street Revegetation Project are to use native plantings to restore the habitat value of the wetland by diversifying vegetation in the tree, shrub, and herbaceous layers. Priority was given to species already present on the site" creating continuity with the surrounding plant communities. 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. Condition of planted species, planting dates, and plant survivorship spanning all the monitoring periods (1998-2002) can be found in the monitoring forms included in the Appendix (Figures II, IIL and IV). Survival rates for salvaged plants are evaluated separately to specifically syamine whether this type of transplanting will be valuable for future projects. Olrmpic Wetland Resources, Lrc. I Hendricks and 30ft Street Revegetation Monitoring Report Jnh'2002 Final Report Year 5 2.2.1 Determining Suruival Rates of Trees, Shrubs, and Emergents Actual survival percentages were calculated by comparing the numbers of plants observed alive and healthy to the total numbers planted. These survival rates are listed on the monitoring forms in the Appendix for each of the plant communities. 2.2.2 Docurmenting'Wefland Changes with Photographs Six permanent photopoints were established to document the changes of the vegetation layer over dm;. A map showing photopoint locations and the direction photographs were taken is included in the Appendix (Figure I) Atl photographs are also included in the Appendix (Figures V and VI) 2.3 Monitoring Schedule As per City of Port Townsend monitoring requirements, this site was monitored annually for three years after final planting. Table 1 shows the status of the monitoring schedule. Table 1 Scheduld 3.0 Results and Discussion Monitoring goals are to determine whether the performance standards identified by the City of Port Townsend have been met for this re-vegetation project. Performance standards require that the site 69 dsminated by a cover of 85o/o "desirable species" with less Ihan I5Yo "weed species" 3 years after final planting. Survivorship of tree and shrub species is expected to be 80o% or greater 5 years after the final planting phase. All dead or dyrng plants should be replaced using fts 5ame species from the original planting plan during the appropriate season. All Scot's broom and reed canarygrass should be completely eliminated from the site. Dixie Llewellin of Olympic Wetland Resources, Inc. collected data on July 10,2002. A comprehensive count of all trees, shrubs, and emergent vegetation was completed. Species that did not survive the first year. (zero percent survival rates) were not included in the percentage listed below. For example, madrona and bitter cherry were re-planted on site in 1998 as part of the salvage effort; these trees did not survive the first year planting. Madrona is an exceptionally difficult species to transplant and bitter cherry is also sensitive to root disturbance. Survival rates of plants observed and survival rates of plants planted are discussed in the following sections. 3.1 Forest Survival The average survival rate for trees is 45o/o. Inthe tree layer, shore pines have an excellent survival rate (9loh), 10 of the 11 trees planted remain healthy and vigorous. The mountain ash and maple are suffering from drought and deer grazing. The bark is also scarred as a result of bucks rubbing their antlers on the tree trunks. This is often fatal to young trees. Two of the six aspen salvaged Olr.rnpic Wetland Resources, Inc. 2 Hendricks and 30fr Street Revegetation Monitoring Report Julv 2002 Final Report Year 5 Suruner 2002Fall2000Fall2001Fall 1998 Spring 1999 Fall 1999 '71028/00 8/0110/98 8/99Vegetation and Habitat '71028/00 8/0110/98 8/99Photopoints '71029/00 910711199t2/98Annual Report from the airport are established and healthy after 4 years. Both the serviceberry and bitter cherry are small but healthy and should be able to out-compete the surrounding grasses. Several large vine maples that were healthy last year were dead this year; the remaining maples appear dry and stressed. The irrigation system was turned on late in the summer in 2000 and not activated at all in 2001 or 2002. 3.2 Scrub/Shrub Survival The overall survival rate of scrubs was good , at 87oh. The twinberry, Indian plunl rose, and willow have had a l00o/o success rate. Both the willow and the rose came from the salvage effiort. Snowberry populations exceed the number planted due to the surrounding populations returning to the site. Both the hawthorn and the oceanspray are spreading and appear well adapted to site conditions. The remaining three dogwoods are very stressed and may not suwive another year. Dogwoods thrive in moist soils and were planted in the lower areas near the ponded water. During the 5 years of monitoring the pond has reduced in size. 3.3 Emergent/Herbaceous Sumival Survival rate for most emergent species was good, at 88Yo. Several planted species such as slough sedge, soft rush, water parsley, and hardstem bulrush are extremely well established and are reproducing rapidly. These plants require a constant source of water. During this monitoring the bottom of the ponded area had only zurface saturation Annual stormwater levels determine the health of this plant community; as long as water is present these native plants will dominate the pond area. 3.4 Salvage Effort Salvage plants were removed from the site and planted in capillary beds for approximately one year. They were returned to the site after final elevations were complete. The overall survival rate for salvaged plants varied according to plant type. The Madrona, cherry trees, and sword fern suwived the year in the capillary beds but did not survive the replanting at the site. Slough sedge has not adapted to the new site and is not vigorous or spreading; this may be due to the excavated soils. The willows, spirea, snowberry, hazelnut, and rose that were returned to the site had an excellent survival rate (l0Oo/o). Hawthorns and oceanspray also had a very good survival rate (9loh and 80%). 3.5 Weedy Species Several non-native weeds, including Himalayan blackberry, curly dock, and bull thistle, have been identified on the site since the first monitoring period. Cunent$ these species cover far less than 15% of the area and are not the dominant cover. Mowing around the planted trees and shrubs was done in the fall of 2000 but the site has not been maintained during 2001 or 2002. The invasive weeds do not seem to be spreading to the upland areas, which are covered by a heavy grass layer (Fescue Festuca qrundinqcea and Bentgrass Agrostis spp ) Neither Scot's broom nor reed canarygrass was observed during the 2002 survey. Olrmpic Wetland Resources, Inc. i Hendricks and 30tr Street Revegetation Monitoring Report Julv 2002 Final Report Year 5 4.0 Summary Performance standards require that the Hendricks Street revegetation project be dominated by a cover of 85o/o "desirable species" with less than l5oh "weed species" 3 years after final planting. The project meets these standards overall, the main cover other than the planted trees and shrubs is a d"nse layer of grasses, which include fescue and bentgrass. These grasses are not considered "weedy species". Invasive weeds including Himalayan blackberry, curly dock, and bull thistle represent less than I5%o aenal cover of the site. Neither Scot's broom nor reed canarygrass was observed during this monitoring. The performance standards have been met for this project. The majority of salvaging, planting, and maintenance at the Hendricks Street revegetation project has been conducted by an all-volunteer work force. In 1998 the City had the first phase of an irrigation system installed, including 6ain lines and hose bibs. In 1999 the drip irrigation was completed but was not activated until late in the summer (August 1999\ Irrigation was not working during the monitoring io August of 2000 and was not activated during the 2001 or 2002 season. Maintenance after the final planting in 1999 was minimal Many plants did not survive after the initial planting due to minimal weeding and watering. Of the 64 trees planted 28 have survived, and from the original250 shrubs planted 77 are present. The high mortality rate of the trees and shrubs that did not survive the first year can be explained due to the lack of water or maintenance Even native trees and shrubs require some maintenance until established. Other factors for mortality include poor soils (leftover from excavation of site) and deer grazing and antler rubbing Survivorship of tree and shrub species is expected to be 80% or greater 3 years after the final planting phase. Final percentages calculated do not include plants that did not survive the first year after planting Tree, shrub, and emergent populations have survival rates of 45o/o" 87Yo, and 88o%, respectively. Surrounding native populations of snowberry, oceanspray, and hawthorn are also spreading to the site. The established trees and shrubs are surviving on site (with the exception of the vine maples, down 5 trees from last year) and can probably withstand local weather conditions with dry summers. The salvage efficrt can be considered a success with an 87% survival rate. Survival rate for the emergent species planted is excellent. The original 20 bulrush planted have become a thick stand of well over a 100 plants. The water parsley is also lush and spreading. All emergent populations depend on a regular presence of water. Over the 5-year monitoring the pond has had less water in it each year; only surface saturation was observed during this final monitoring period in July. This site has met the general performance standards outline by the City Of Port Townsend. The survival rate for trees is below the desired 80% but surround native populations are spreading. The remaining planted species should be expected to survive without maintenance or water into the future. Maintenance or weeding will be an aesthetic choice for the City and the surrounding neighborhood. Olwnpic Wetland Resources, Inc. 4 Hendricks and 30fr Street Revegetation Monitoring Repofi Julv 2002 Final Report Year 5 30th Shest Photopoint # 5 ,ry 9ATAL Photopoint # 1l FENCH wtTH {VINES DR,IYEI\AYTO CHURCH Eto6ra,rE #4 a@$qc.Dtrg.dr6rffF9 #6a and b RED --\ WAX|vf/KILE- ocrnNgrr,cv ).-.,\ia g A5H #3 RU'H 94Etn BRjElgEtrJ \{u0*r filh llendrickr Street Plonting Plon ond Photopointr ftolc $:?+ 'ril 1* :ii --a',.-{ :f :tir j. :.':; 0lyaic Uellond lsurcet, lnc 856 50lh lhesl Portlu*uard, UA 98368 360385#32 Dme: July 2002 Figure I r$ *: 0iat tilv of Porl lowntend, \t|A l8T 0uincv Slree+ Porl lor,rniend, llA 9836S 2002-00673 Hendricks and 30th Street Photopoints #1,#2, and#3 July 2002 Photopoint #1 East View From Church Photopoint #2 Retention Pond Photopoint #3 North View From Top Of Mound Olympic Wetland Resources, Inc.Figure V Hendricks and 30th Street Photopoints #4,#5, and#6 July 2002Photopoint #4 West ViewPhotopoint #6Photopoint #5 Biofiltration Swale Otr30th StreetHealthy Water Parsley In The EmergentZoneOlympic Wetland Resources, Inc.Figure VI. Figures Appendix I Monitoring Area and PhotoPoints II Tree and Emergent Monitoring Form m Shrub Monitoring Form IV Salvaged Plants Monitoring Form Photopoints V PhotoPoints #1, #2, and#3 M PhotoPoints M, #5, and#6 Figure ll. Tree and Emergent Monitoring Date: July 11, 2002 Observer: D.Llewellln, Olympic Wetland Resources, Inc. €(D EA GI E =as .E990\anB.9e.5i .eoEo\olaac..tadtsriO{C\AF.E.g.s.E.E€9epP;q)666d|€ EFHFnEe V r E g E E U d)i E,.H ESdi 686E6) Ecl Fr CommentsCommon Name Scientific Name Tree Totals 450 l0 4 50 20 88"h Two native species occuring in abundance in the wet area are Bur-ree d, Spargunium emersunt and spike-rush, Eleocharis purvula 3 5 7 l0 2 5 0 I 5ll6198 Vine maple Acer circinalum fi17/98 Servicebery Amelanchier alnifulia 5ll6198 Shore pine Pinus contorla fi17/98 Quaking aspen Populus lremuloides fi17198 Bitter cherry Prunus emarginata 41U99 Sequoia Sequoia sempervirens 4lll99 Mountain ash Sorhus scopulincr l2 4 t2 l0 7 3 25%Population dying, even the large trees 20 l6 t3 7 7 7 35%Small trees healthy ll 6 ll l0 l0 l0 9l%Very healtlhy and growing 6 6 3 2 2 2 33%Two trees hea l0 l0 0 2 6 5 50%V small trees but 2 N/A 2 0 0 0 UYo Did not make it past the first Year 3 N/A 3 I 2 I 33%One stressed trees Present Slough sedge (larex obnupta '2121198 212U98 Soft rush .luncus effisus Oenanlhe sarmenlosat0122197Water parsley Scirpus aculus10t22197IJardstem bulrush 20 l7 20 2 l0 l0 50%One srnallclump not sPreading 4 4 4 4 lO0o/o Abundant 50 40 45 50 50 50 100%Abundant and spreading as lo@ 20 20 40 20 20 20 lo0%Abundant and spreading as long as water is present Figure II. Figure lll. Shrub Monitoring Common Nnme Scientific Ft'.ame Totals shrub only Total plant couttt includes both salvaged asrd nursery plants. Weed Species: Bull thistle Cirsium vulgare, Curly dock Rumex':r:;pus Dnte: July I l, 2002 Observer: D.Llewellln, Olympic Wetland Resources, Inc. Comments ative border are Heal and 870 c .,' €o(t) u)c)tsa 13 0.)cRIA (! ta O a..loooo<>oal 6t .{trtrc !'rJ€ocl() ELLooc,)466-o.o3ooo o\o\o\ l 2 3 l0 l0 8 4 4 5 8 3 5 l0 l0 Berr ber is auraifttl ium *5lll99 Oregon grape Red-osier dogwood ()ornu,r sericgu*5/U99 Hazelnut Corylus c1rqtalu**sll6198 97198 Douglas' hawthorn Crataegu,s tttugiasii 97198 Ocean-spray Holodi,vcu.s iiscolor* * Loniceru iw.wilucralu*5lll99 Black twinberry 0 e m I e r i a c e-*ss Ab r m i s *5lll99 Indian plum Pacific ninebark Physocurpx' caPilatul; *slU99 Red currant Rihess^6198 2l2ll98 Nootka rose Rosa nutkomn** 5ll6198 Scoulers willow Salix scoulerianct Sambucus cen'ulecr5il6198Blue elderberry Spiraeu douq:lasii5lt6198Hardhack (Spirea) Sy m p ho r i c etr--n o s a I b u s2l2ll98Snowberry 2i .uA l6 2 2 I 5%The remaining plant is srnall l'j vR I l0 l0 2 20%Dogwoods Drefer lush soils and a wetter environment 93 3 2 2 3 33%Remaining plant somewhat stressed due to poor soils li ,'0 8 8 ll l0 9t%Plants healthy and flowering 1!.'4 t4 7 l0 l0 7t% IvA 8 8 8 8 IOOVI Large plant were installed and are surviving ,. 1+[I 4 4 4 100%Plants are stunted but surviving I riR l0 8 4 4 50%Ninebark on site thriving I'it .0 5 2 5 5 50%Surviving plants healthy t 7 8 8 8 8 100%Rose population spreading )3 3 3 3 t00v, 1it, .6 7 7 8 5 50v,One very healthy plant, the remaining a bit stunted 5 5 5 5 200%Healthy and flowering 1,+4 4 4 l0 250%Species is also spreading from surrounding populations Figure llI. Figure IV. salvaged Plants Returned to Hendricks and 3Oth street Common Name ts/Herbaceous Scientific Name Eme Totals Shrub Totals Tree 'tr(.)PtrcgE (! Eas OOO\O-a]O\O\OOAO\O'AOO .'l c-l c{trtrtrEtr dEEEEEHooooc)Hottiet!Edioooo =-o-O.o-O-O(); o o ooo:th :th :fr :th :th :th E C)eg€-0)(d =l-0) Date: July I1,, 2002 Observer: D.Llewellin, Olympic Wetlnnd Resources, Inc. 790/1f. g60h 2121198 Slough sedge Carex obnultla 2t2ll98 Soft Rush ,luncus e.ffusus 2/2t/98 Sword fern Polvslichum munitum l0 t7 l7 20 20 l0 l0 590/o 2 2 2 4 4 2 2 l00Vo 0 I 0 0 0 0 0 jYo 2t21198 I{azelnut Corylus cornula 2l2ll98 Dougl as'hawthorn (lralaegu.s dougiasii 2/21/98 Ocean-spray Holodiscus discolor 2t2v98 Nootka rose Rosu nutkana 2/21/98 Scouler willow Sulix scoulerianu 212U98 Hardhack (Spirea)Spiraeu douglusii 2t2ll98 Snowberry Symphoricarpls ulbus I I I I I I I l00Yo l0 ll l0 l0 l0 l0 l0 9lY" 4 5 I 5 4 4 4 80Yo I 8 8 I 8 8 8 l00Yo 3 3 2 aJ 3 3 3 l00Vo 5 5 5 5 5 5 5 l00Yo 4 4 3 4 4 4 4 l00Yo 2/21198 Madrona Arhulus menziesii 2l2ll98 Bitter cherry Prunus emurginulu 0 2 0 0 0 0 0 jYo 0 3 0 0 0 0 0 }Yo Totals 88t',1,0o/o Figure IV.