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HomeMy WebLinkAbout19970269 Ver 1_Complete File_20020830 BLUE Land Water Infrastructure,PA Thursday, August 29, 2002 NCDENR - DWQ Attn: Mr. John Dorney 2321 Crabtree Boulevard, Ste. 250 Raleigh, NC 27604-2260 0\- u o'}/ ~ 139-G Technology Drive Garner North Carolina 27529 Voice: (919) 661-0073 · Facsimile: (919) 661-9829 www.blwi.com · blwi@blwi.com RE: Year Two Post-Construction Macroinvertebrate and Vegetation Monitoring Buckhead Creek Mitigation Project Fayetteville, Cumberland County, North Carolina .' ! Dear Mr. Dorney, Enclosed you will find the Year Two Post-Construction Macroinvertebrate and Vegetation Monitoring Report for the Buckhead Creek Mitigation Project. This report has been read and approved for release by the City of Fayetteville. Macroinvertebrate sampling was conducted during the second year after mitigation related construction activities on Buckhead Creek and the unnamed tributary (as described in the Buckhead Creek Drainage Project Mitigation Plan dated November 3, 1998). Macroinvertebrate populations were sampled o~ober 2, 20~CCOrdance with the Standard Qualitative Method outlined in the North Carolina Division of Water Quality's d<ud ~ ng Procedures for Biological Monitoring (1997). Quantitative measurements of vegetation establishment (survival and percent cover) were also conducted. Results were compared to the pre-construction and year one monitoring data, and a discussion of these findings is included. Subsequent benthic macroinvertebrate samples will continue to be collected as scheduled, annually in years 3-5 (2002-2004). Vegetation establishment will be monitored annually until deemed successful according to requirements set forth by the approved City of Fayetteville Stream Mitigation Plan. Annual reports outlining the results of each monitoring period will continue to be submitted to the North Carolina Division of Water Quality and the United States Army Corps of Engineers upon approval and release from the City of Fayetteville. If you have any questions or comments, please do not hesitate to call. Amber Coleman Environmental Consultant attachments: Post-Construction Macroinvertebrate and Vegetation Monitoring Report - Year Two cc: Ms. Lillette Moore, US Army Corps of Engineers t c._ POST -CONSTRUCTION MACROINVERTEBRATE AND VEGETATION MONITORING (Year Two) Buckhead Creek Mitigation Fayetteville, Cumberland County, North Carolina Prepared for The Rose Group, Inc. P.O. Box 103 Fayetteville, North Carolina 28302 Prepared by B L DE =Uuc~e,,^ December 200 I BL WI Project Number 990845 t ,- POST -CONSTRUCTION MACROINVERTEBRA TE & VEGETATION MONITORlNG YEAR 2 - Buckhead Creek Mitigation - Fayetteville, Cumberland County, North Carolina TABLE OF CONTENTS I. INTRODUCTION ......................................................... 1 II. MEmODS .............................................................. 2 Benthic Macroinvertebrate Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2 Vegetation Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2 III. RESULTS AND DISCUSSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3 Benthic Macroinvertebrate Sampling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3 Vegetation Sampling. . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . .. 4 IV. CONCLUSIONS ......................................................... 7 Benthic Macroinvertebrate Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7 Vegetation Sampling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7 APPENDICES Appendix A. Vicinity Map Appendix B. Stream Physical and Water Quality Characteristics Appendix C. Benthic Macroinvertebrate Species Appendix D. Metric and Diversity Calculations for Benthic Macroinvertebrates Appendix E. Pre- and Post-Construction Benthic Macroinvertebrate Comparison . POST -CONSTRUCTION MACROINVERTEBRATE & VEGETATION MONITORING YEAR 2 - Buckhead Creek Mitigation - Fayetteville, Cumberland County, North Carolina INTRODUCTION In 1998, hard improvements (trapezoidal, grout-filled fabric lined permanent channel) were constructed in an unnamed tributary to Buckhead Creek (North Carolina Division of Water Quality index # 18-31-24-6) by the City of Fayetteville to increase stormwater runoff conveyance from existing medical, residential and commercial properties that have experienced flooding problems. The project, known as the Buckhead Creek Drainage Project, located in Subbasin CPF15 of the Cape Fear River Basin, impacted 2,385 linear feet of stream and 0.65 acres of wetlands. On-site mitigation at a 1:1 ratio is a requirement of the Clean Water Act (CWA) Section 404 Individual Permit (Permit # 199704640) issued to the City of Fayetteville by the United States Army Corps of Engineers (COE) and the Clean Water Act Section 401 Water Quality Certification (Certification # 3164) issued by the North Carolina Division of Water Quality (DWQ). The mitigation plan, a cooperative effort among the City of Fayetteville, the North Carolina Division of Water Quality, and the North Carolina Wetlands Restoration Program (WRP), specified 1,400 linear feet of stream and riparian restoration along the unnamed tributary downstream of the hard improvements and along 985 linear feet of the main stem of Buckhead Creek (see Appendix A). Mitigation activities consisted of grading the streambeds, streambanks, and their associated floodplains as well as revegetating riparian areas through live stakes, fascines, and seeds of native species. In addition, approximately 400 linear feet of Buckhead Creek will be realigned to its approximate historical position in the landscape. The primary goal of the mitigation is to enhance water quality and wildlife/fisheries habitats. The proposed mitigation was first put forth in a mitigation plan prepared by Soil and Environmental Consultants, Inc. (S&EC) and accompanied by construction plans prepared by The Rose Group. BLUE: Land, Water, Infrastructure, PA (BLWI) was contracted to perform monitoring for the project after this mitigation plan was approved. It is BLWI's understanding that the mitigation plan, as prepared by S&EC, was approved with a final revised date of 12\14\98. This mitigation plan is the document referred to by BLWI to conduct the mitigation monitoring. BL WI has conducted the monitoring in a manner consistent with our interpretation of this document. As per meetings with North Carolina Division of Water Quality (DWQ) earlier in the year, BL WI has complied with sampling criteria set forth in the approved mitigation plan. However, DWQ did request additional sampling to improve the quality of data. To date, BL WI has not been authorized to perform additional sampling. Therefore, no additional sampling was conducted by BL WI for the "Year Two" monitoring. Please direct any questions about the actual mitigation plan to The Rose Group. In September 1999, BLWI sampled pre-construction benthic macroinvertebrate populations to facilitate comparisons of water quality between pre-construction and post-construction conditions. In early October 2000, BL WI completed the first annual post-construction sampling. In early October 2001, BLWI completed the second of five annual post-construction benthic macroinvertebrate assessments in Buckhead Creek and its unnamed tributary. Monitoring activities also included quantitative measurements of vegetation establishment (survival and percent cover), physical and chemical water characteristics, as well as qualitative assessments of general channel conditions. page 1 ) " POST -CONSTRUCTION MACROINVERTEBRATE & VEGETATION MONITORING YEAR 2 - Buckhead Creek Mitigation - Fayetteville, Cumberland County, North Carolina MEmODS Benthic Macroinvertebrate Sampling BL WI has sampled benthic macroinvertebrate populations in Buckhead Creek and the aforementioned unnamed tributary. The standard qualitative methods described in the North Carolina Division of Water Quality's Standard Operating Procedures for Biological Monitoring (1997) were employed for collecting samples. Samples included kick net samples of riflle areas, sweep-net samples of undercut banks, and fine-mesh samples of woody debris scrapings. In accordance with the City of Fayetteville Stream Mitigation Plan, these samples were taken at one location along Buckhead Creek Oower end of mitigation) and one location along the unnamed tributary Oower end of mitigation). The sampling locations are the same locations sampled pre-construction in 1999 and post-construction in 2000. The macroinvertebrate samples were identified by Pennington and Associates, Inc. in their certified laboratory (DWQ Biological Certificate # 026) in Cookeville, Tennessee. In addition to sampling macroinvertebrates, physical and water quality 'characteristics were recorded at each sampling location (Appendix B). A habitat assessment score (based on the Habitat Assessment Field Data Sheet) was assigned at each sampling location. The metrics (EPT Index and Biotic Index) used to assign fmal bioclassifications were calculated according to the Division of Water Quality's Standard Operating Procedures for Biological Monitoring (1997) (Appendices C - E). The bioclassification ratings in Appendix E are based upon the Biotic Index. Vegetation Sampling Revegetation of wetland plants has occurred along the reconstructed channel cross-sections. This includes the entire mitigation reach along the unnamed tributary and the 400 feet realignment along Buckhead Creek. The planting plan called for plant material to be added through fascines and live staking for woody material and seeding for herbaceous material. According to the approved City of Fayetteville Stream Mitigation Plan, successful revegetation will be realized when 75% vegetative coverage is attained from top of bank: to top of bank along the planted areas and the plants have survived for five years. The plan also states that herbaceous cover will be deemed successful when the re-vegetated areas are comprised of at least three of either the introduced or volunteer species. For woody vegetation to be deemed successful, the mitigation plan states that no more than 50% of the successful woody vegetative coverage can be comprised of one single species and volunteer woody species can count for no more than 10% ofthe overall success criteria coverage. Table 1 lists those plant species designated for introduction by the mitigation plan. To determine the status of the vegetative cover as it relates to the above success criteria, a sampling regime was established to quantify the site vegetation. Randomized transects 25 feet in width running perpendicular to the stream from top of bank to top of bank were established along the revegetated areas of the unnamed tributary and Buckhead Creek. Each transect was then assessed for overall plant cover. The herbaceous layer was evaluated by documenting all species found within the transect. The woody vegetation was also assessed by documenting all species found as well as the percentage of each species within the woody layer. page 2 . POST -CONSTRUCTION MACROINVERTEBRA TE & VEGETATION MONITORING YEAR 2 - Buckhead Creek Mitigation - Fayetteville, Cumberland County, North Carolina Table 1. Plant Material List (from City of Fayetteville Buckhead Creek Mitigation Planting Plan October 1998 Wood Shrub S ecies for Fascines Live Stakin and Joint Plantin RESULTS AND DISCUSSION Benthic Macroinvertebrate Sampling During the collection of macroinvertebrate samples, BL WI also collected physical and water quality characteristics of the two mitigation reaches. Appendix B shows this information along with the equivalent information for the pre-construction and Year I post-construction monitoring. The habitat assessment scores have increased from 2000 to 2001. Dissolved oxygen has decreased. The overall base flow channel width in the unnamed tributary has decreased dramatically while depth has doubled. This is due to sediment accumulation and other morphological functions within the unnamed tributary causing the previous baseflow channel to decrease and transition into a smaller, deeper channel with a larger floodplain. The base flow channel width in Buckhead Creek has increased by a few feet while the depth has halved. This is also due to sediment accumulation. Flow in Buckhead Creek decreased while flow in the unnamed tributary increased. Some shading was available along the unnamed tributary prior to construction, but no shading exists currently. The majority of Buckhead Creek still has trees along its banks and is fully shaded. The relocated portion of Buckhead Creek still has large established trees within 30 feet of the banks and is currently partially shaded. The relocated portion of Buckhead Creek and the unnamed tributary are still relatively low in woody debris compared to pre-construction levels. Buckhead Creek has a wooded reach upstream and trees relatively close to the banks which wi11likely provide woody debris. The unnamed tributary has a more limited source and may take many years for woody debris to accumulate within this reach. Appendices C and D show the list of benthic macroinvertebrate species and sample calculations as reported by Pennington and Associates, Inc. Appendix E shows a comparison chart of page 3 . '" POST -CONSTRUCTION MACROINVERTEBRA TE & VEGETATION MONITORING YEAR 2 - Buckhead Creek Mitigation - Fayetteville, Cumberland County, North Carolina pre-construction and post-construction findings. The total number of organisms has decreased from the 2000 to the 2001 sample, particularly in the unnamed tributary. It is unclear what circumstances caused this decrease, although it could be due to the dramatic change in channel size in the unnamed tributary. Although decreasing in numbers of organisms, it appears the unnamed tributary is improving with regard to the type of macroinvertebrates found there. The unnamed tributary improved from a bioc1assification of 'poor' at pre-construction sampling to 'good-fair' at year 2 post-construction sampling, but Buckhead Creek remained unchanged at 'fair. ' Vegetation Sampling The banks of the stream are well stabilized with vegetation. BL WI observed a few small areas where work had likely been conducted on the adjacent sewer lines and were without much vegetation. However, these areas were covered with erosion control blankets and no erosion was evident. Except for the few small areas, both the unnamed tributary and Buckhead Creek had 100% vegetative cover. Herbaceous Vegetation Both sites were found to have greater than three species of herbaceous plants (see Table 2). Note, however, that none of the species found during sampling (Table 2) match the species shown in the list of introduced species (Table 1). It was confirmed in the fall of 2000 that no seed had been placed on-site since the completion of construction. BL WI staff was told that the management plan was to seed the wetland shelves in the spring of 2001. There was no indication that this activity took place. However, the existing vegetation is dense and an introduced seed mix would not have a high likelihood of success without initial control of the volunteer species. The approved mitigation plan does not make a distinction between introduced and volunteer species for the success of the herbaceous layer; and thus, the herbaceous layer should currently be deemed successful. However, Murdania keisak is still showing dominance at both sites creating a situation whereby other species may be choked out in subsequent years. This potential problem will be monitored during the remaining monitoring site visits. Woody Vegetation The 'Year l' monitoring report found that woody vegetation was not meeting success criteria as listed in the approved mitigation plan. As a result of this finding, BL WI stated in the 'Year l' monitoring report; "To comply with success criteria, the dense Salix nigra stand will need to be thinned and other woody species listed in Table 1 (plant Material List) will need to be planted." The primary focus of 'Year 2' monitoring was to document the remediation activities for woody vegetation success. As shown in Table 3, the sample plots showed no discernible change in woody vegetation coverage from the 'Year l' monitoring report. BL WI found that nearly 100% of the woody vegetation coverage in the study area was only one species (Salix nigra). The approved mitigation plan states that no species can account for more than 50% of the total woody vegetation coverage, however, both sites are not meeting this requirement. As in the 'Year l' monitoring, both sites are still not meeting approved woody vegetation success criteria. BL WI would like to make note of some additional woody vegetation planting which did take place along the unnamed tributary. BLWI found that woody stakes had been planted in portions of the site. Upon investigation of the planted stakes, BL WI found a mortality of approximately page 4 . POST -CONSTRUCTION MACROlNVERTEBRA TE & VEGETATION MONITORING YEAR 2 - Buckhead Creek Mitigation - Fayetteville, Cumberland County, North Carolina 90%. The only stakes found with leaves were determined to be Camus amamum (silky dogwood). BL WI was not provided a list of species planted and cannot confirm if the other two proposed introduced species were planted. These woody stakes were found along a flat shelf midway between the base flow channel and top of bank, and within the designed base flow channel (on the fresh sediment deposits within the base flow channel). The original construction plans called for woody vegetation to be planted on the slopes but not on the flat tiers and no planting was to take place within the base flow channel. Along the slopes which were designated for woody vegetation, no thinning of the existing Salix nigra was evident. To provide for a full assessment of future planting activities, a report on all woody vegetation remediation activities will be beneficial for BL WI's monitoring visits. page 5 . POST -CONSTRUCTION MACROINVERTEBRA TE & VEGETATION MONITORING YEAR 2 - Buckhead Creek Mitigation - Fayetteville, Cumberland County, North Carolina lin Ve etation Percentage of Woody La er Introduced(I) or Volunteer <1% V <1% V <1% V 99% I 1% I 99% I page 6 . POST-CONSTRUCTION MACROINVERTEBRATE & VEGETATION MONITORING YEAR 2 - Buckhead Creek Mitigation - Fayetteville, Cumberland County, North Carolina CONCLUSIONS Benthic Macroinvertebrate Sampling The mitigation appears to be on track, and as of the second year after construction, water quality has not diminished or risen substantially compared to parameters collected both pre-construction and post-construction year 1 (Appendix B). The habitat assessment scores are increasing from previous scores. This increase in score is mainly due to an increase in actual numbers of plants as well as an increase in the size of the plants. According to the final calculated bioclassifications using the biotic index, water quality has improved from 'poor' to 'good-fair' along the unnamed tributary and water quality has remained 'fair' along Buckhead Creek. (Appendix E). Vegetation Sampling The overall vegetation coverage is at nearly 100% and thus meets the mitigation plan criteria for percent vegetation cover. The vegetation appears mostly healthy throughout the mitigation area and an overall vegetation coverage of nearly 100% is expected to remain. None of the proposed introduced species listed in Table 1 are present on-site. The herbaceous vegetation is made up solely by volunteers and there was no evidence of seeding that was to be performed in the spring of 200 1. Either seeding was not performed or the seedlings were not able to establish themselves without control of the existing volunteer species. However, the herbaceous vegetation is quite diverse and meets the success requirements set forth in the mitigation plan. BL WI recommends that no action be taken in regards to the herbaceous vegetation at this time. The possibility exists that species diversity might be lost in the herbaceous layer over time. Therefore, BL WI will continue monitoring efforts to assure that species diversity is maintained over the next few years. The woody vegetation does not meet the success requirements set forth in the mitigation plan. While cover is at nearly 100%, it is highly dominated by the introduced Salix nigra (Black Willow). A few stakes of other woody species appear to have been planted along the unnamed tributary but had a very low survival rate. The plan states that no species may account for more than 50% aerial coverage and volunteers must account for less than 10%. In accordance with the mitigation plan, the lack of diversity within the woody vegetation layer will require a contingency plan to amend the problem. BL WI recommends that all stakeholders, including the Division of Water Quality, be consulted to determine the best plan of action given the current status of the woody vegetation. Overall, the mitigation project appears to be progressing as designed. page 7 . POST -CONSTRUCTION MACROINVERTEBRA TE & VEGETATION MONITORlNG YEAR 2 - Buckhead Creek Mitigation - Fayetteville, Cumberland County, North Carolina APPENDIX A Vicinity Map . N + Vicinity Map o 500 1000 Feet , Scale: I" = 1000' BLUE Land Water Infrastructun: USGS 7.5 Minute Topographic Map FA YETIEVILLE Quadrangle (SW Comer) .. ' POST -CONSTRUCTION MACROINVERTEBRA TE & VEGETATION MONITORlNG YEAR 2 - Buckhead Creek Mitigation - Fayetteville, Cumberland County, North Carolina APPENDIX B Stream Physical and Water Quality Characteristics "- . 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E (I) "" 00 00 00 o-=- Eo-< U Eo-< '- ' POST -CONSTRUCTION MACROINVERTEBRA TE & VEGETATION MONITORING YEAR 2 - Buckhead Creek Mitigation - Fayetteville, Cumberland County, North Carolina APPENDIX C Benthic Macroinvertebrate Species .. .. Appendix C. Benthic macroinvertebrate species, Buckhead Creek and unnamed tributary, Fayetteville, Cumberland County, North Carolina, Post-Construction, October 2,2001 SPECIES T.V.** F.F.G.*** Buckhead Unnamed Creek Tributary MOLLUSCA Gastropoda Basommatophora Physidae Physella sp. 8.84 CG 1 ANNELIDA Oligochaeta *10 CG Haplotaxida Hirudinea *8 P 5 ARTHROPODA Crustacea Decapoda Cambaridae Procambarus sp. 9.49 SH 1 Insecta Ephemeroptera Ephemerellidae *1 SC Eurylophella sp. 4.34 SC 5 Heptageniidae *4 SC Stenonema sp. *4 SC 20 Odonata Aeshnidae *3 P Boyeria vinosa 5.89 P 1 Coenagrionidae *9 P Enallagma sp. 8.91 P 338 273 Gomphidae *1 P Gomphus sp. 5.8 P 5 Progomphus obscurus 8.22 P 3 Megaloptera Sialidae *4 P Sia/is sp. 7.17 P 1 Trichoptera Hydropsychidae *4 FC Cheumatopsyche sp. 6.22 FC 5 1 Pennington and Associates, Inc. Page 1 of2 " ~ SPECIES T.V.** F.F.G. *** Buckhead Unnamed Creek Tributary Coleoptera Elmidae *5 CG Ancyronyx variegata 6.49 SC 10 Dubiraphia sp. 5.93 SC 5 Stenelmis sp. 5.1 SC 15 Haliplidae Peltodytes sp. 8.73 SH 5 Diptera Chironomidae 10 10 Ablabesmyia mal/oehi 7.19 P 20 7 Chironomus sp. 9.63 CG 10 Crieotopus sp. *7 CG 20 Cryptoehironomus fulvus 6.38 P 10 13 Dierotendipes sp. 8.1 CG 10 326 Mierotendipes sp. 5.53 CG 13 Phaenopseetra sp. 6.5 SC 180 3 Polypedilum halterale 7.31 SH 30 13 Polypedilum illinoense 9 SH 30 20 Proc/adius sp. 9.1 P 10 Rheotanytarsus sp. 5.89 FC 90 Saetheria tylus 7.07 CG 280 Tanytarsus sp. 6.76 FC 170 3 Thienemannimyia gp. 8.42 P 10 3 Tribelos sp. 6.31 CG 140 Simuliidae *6 FC Simulium sp. 4 FC 5 TOTAL NO. OF ORGANISMS TOTAL NO. OF SPECIES 1439 29 691 14 *HilsenhoffTolerance Values used when North Carolina Tolerance Values are not available **T.V.= Tolerance Values range from 0 for organisms tolerant to organic pollution to 10 for organisms intolerant to organic pollution ***F.F.G.=Functional Feeding Groups: CG=Collector/Gatherers, SC=Scrapers, FC=Filtering Collectors, SH=Shredders, P=Predators and PI=Piercers Pennington and Associates, Inc. Page 2 of 2 - ... . POST -CONSTRUCTION MACROINVERTEBRATE & VEGETATION MONITORING YEAR 2 - Buckhead Creek Mitigation - Fayetteville, Cumberland County, North Carolina APPENDIX D Metric and Diversity Calculations for Benthic Macroinvertebrates ... (\ POST -CONSTRUCTION MACROINVERTEBRA TE & VEGETATION MONITORING YEAR 2 - Buckhead Creek Mitigation - Fayetteville, Cumberland County, North Carolina Appendix D. METRIC AND DIVERSITY CALCULATIONS FOR BENTHIC MACROlNVERTEBRATES COLLECTED BY BLUE: LAND, WATER, INFRASTRUCTURE, PA ON OCTOBER 2,2001 METRIC Buckhead Creek Unnamed Tributary Taxa Richness 29 14 NCBI 7.179 6.513 Ratio of Scraper/Filt. Collectors 0.870 0.750 Ratio of ShredderslTotal 0.042 0.055 EPT Index 3 1 % Contribution of Dom. Taxon 23.49% 47.18% EPT/Chironomidae Abundance 0.03 0.00 Jaccard Coefficient Buckhead Creek Unnamed Tributary Buckhead Creek 0 0.344 Unnamed Tributary 0.344 0 Percent Similarity Buckhead Creek Unnamed Tributary Buckhead Creek 0 32 Unnamed Tributary 32 0 Diversity Indicies Index Buckhead Creek Unnamed Tributary Richness Number taxa 29 14 Margalef 2.67 1.38 Menbinick 0.764 0.533 Heterogeneity Simpson 0.863 0.62 Shannon 3.39 1.85 Hill (Nt) 10.45 3.6 Hill (N2) 7.28 2.63 Evenness Pielou 0.697 0.486 Sheldon 0.36 0.257 Heip 0.37 0.2 Hill 0.697 0.73 Hill mod 0.665 0.627 J.. ,II .. 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