S.R 3001, Section 01B Franklin Street Over Swabia Creek Lehigh County, Pennsylvania
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S.R 3001, Section 01B Franklin Street over Swabia Creek Lehigh County, Pennsylvania Prepared by:by Sheladia Associates, Inc. November, 2000 Submitted to: Pennsylvania Department of Transportation Engineering District 5-0 Allentown, PA WETLAND IDENTIFICATION AND DELINEATION REPORT S.R. 3001, SECTION 01B FRANKLIN STREET OVER SWABIA CREEK LEHIGH COUNTY, PENNSYLVANIA PREPARED BY SHELADIA ASSOCIATES, INC. NOVEMBER, 2000 SUBMITTED TO: PENNSYLVANIA DEPARTMENT OF TRANSPORTATION ENGINEERING DISTRICT 5-0 ALLENTOWN, PA WETLAND IDENTIFICATION AND DELINEATION REPORT S.R. 300-01B OVER SWABIA CREEK LEHIGH COUNTY TABLE OF CONTENTS A. PROJECT DESCRIPTION............................................................................................................... 1 B. STUDY AREA DESCRIPTION......................................................................................................... 1 C. METHODOLOGY............................................................................................................................. 1 D. RESULTS......................................................................................................................................... 2 E. SUMMARY....................................................................................................................................... 4 F. REFERENCES................................................................................................................................. 5 QUALIFICATIONS OF PREPARER ............................................................................................................. 6 Appendix A Figures 1. Location Map 2. Study Area Map 3. Soil Map 4. NWI Map Appendix B Color Photos Appendix C Data Sheets S.R. 3001, Section 01B Lehigh County A. PROJECT DESCRIPTION The Pennsylvania Department of Transportation has proposed the replacement of the bridge carrying S.R. 3001 (Franklin Street) over Swabia Creek in the Borough of Alburtis, Lehigh County (Figure 1). The existing structure is a single span concrete encased steel I-beam with a length of 5.2 meters (17 feet) and a width of 6.1 meters (20 feet). The proposed construction will allow replacement of the existing deficient and functionally obsolete structure, with a new structure on the existing alignment approximately 6.1 meters (20 feet) in length and 9.8 meters (32 feet) wide. Traffic will be detoured during construction. A temporary crossing adjacent to the bridge will not be used. This replacement will eliminate the need for extensive maintenance in the future and potential bridge closing. B. STUDY AREA DESCRIPTION The study area extends approximately 50 meters (164 feet) along S.R. 3001 and 15 meters (50 feet) wide, upstream and downstream of the bridge. Franklin Street travels north and south while Swabia Creek flows west to east through the project area. (Figure 2 and photos 1,3,7) The channel is cobble and gravel with some sandy areas. On the day of the field view, flow depth vaired from 2 inches to 1 foot. The earth and rock banks are about 1-1.8 meters (3 to 6 feet) high, moderate to steeply sloped and vegetated with brush, ground cover and small to mature trees. Swabia Creek, which is a tributary to Little Lehigh Creek, has a Chapter 93 classification of HQ-CWF. It is not classified as a wild trout stream by the PA Fish and Boat Commission and has no status or nomination to the PA Wild and Scenic Rivers system. It is listed in PennDOTs Design Manual 2, Chapter 10, as a stockable trout stream. The soils underlying the study area have a 0-3% slope and are in the Murrill Soil Association (Figure 3). This soil association is characterized by deep soils of the lower slopes of South Mountain. Within the Murrill Association, a combination of Atkins silt loam and Philo silt loam exist in the project area. Only Atkins silt loam is included on the Lehigh County Hydric Soils list. Atkins soils are described as having slow permeability, moderate soil productivity, medium water holding capacity, and when present a water table of 0-1 foot. Philo soils are described as having slow permeability, moderate soil productivity, high water holding capacity, and when present a water table of 2-3 feet. Photos of the project area are included in Appendix B and are cross-referenced on Figure 2. C. METHODOLOGY Preliminary investigation of the project site included a review of topographic mapping, the National Wetland Inventory (NWI) map (Figure 4), and the Soil Survey of Lehigh County, Pennsylvania (USDA, SCS, 1986; Figure 3) to identify areas likely to have some or all of the three wetland parameters: hydric soils, hydrophytic vegetation, and wetland hydrology. Following the background research, the site was investigated in the field. Wetland identification and delineation on the site was conducted in accordance with the 1987 Corps of Engineers Wetland Delineation Manual, Technical Report Y-87-01 (U.S. Department of the Army Waterways Experiment Station). The Routine Onsite Determination Method was used because of the small study area; field information was recorded on Data Form 1 (see Appendix C) and on sketches of the project area. The boundaries of the wetland area were flagged and surveyed, as shown on Figure 2. Wetlands were classified in accordance with the US Fish and Wildlife Service's Classification of Wetlands and Deepwater Habitats of the United States. Soils were sampled to a depth of at least 10" using a Page 1 S.R. 3001, Section 01B Lehigh County shovel or soil probe, and identified using field indicators (color, moisture, odor, texture) and the Soil Survey. Soil colors were described using the Munsell Soil Color Charts. Plant species were identified using various field guides, and plant indicator status was determined using the USFWS' 1988 National List of Plant Species that Occur in Wetlands: Northeast (Region 1). Wetlands were assigned a qualitative value according to the importance of functions they perform for the surrounding environment based on best professional judgement of the field biologists and the Federal Highway Administration's A Method for Wetland Functional Assessment. Specific functions were assigned based on observations during field investigations. An overall value of high, medium, or low was assigned to each wetland based on the specific functions identified. D. RESULTS The field examination was conducted on August 15, 2000. The weather was warm (30EC/86EF), humid, and sunny. A brief narrative description of each community is presented below, information is also included on the field data sheets presented in Appendix C. The delineation boundary presented on Figure 2 was developed after the field survey of the project area. Despite their proximity to the stream, three of the four communities examined did not meet all three criteria to be delineated as wetlands (i.e. hydrophytic vegetation, wetland hydrology, and hydric soils). Community 1 – Upland/ Wetland (Northeast quadrant) Community 1 is the bank and adjoining overbank area on the northeastern side of the bridge. (See photo 3) Adjacent and parallel to the road embankment on the eastside of the road is a drainage ditch approximately 1.2 meters (4 feet) wide across the top and .5 meters (1.5 feet) wide at the bottom that contains hydrophytic vegetation. Approximately five feet beyond the drainage ditch the topography rises into a mound formation that runs parallel to the road. Directly on the other side of the mound crest (about 1 foot below) is where the wetland area begins to develop. Community 1 includes both upland and wetland areas. A. Upland The mound runs parallel to the road, extending from the northern most part of the bridge for about 170 feet where it flattens out into a maintained grassy lawn. Within the mounded stretch of land the dominant species are summer grape (Vitis aestivalis), Sumac (Rhus copallinum), and pokeweed (Phytolacca americana) with spotted touch-me-not (Impatiens capensis) and multiflora rose (Rosa multifloria) interspersed. (Reference Photo 2 & right side of Photo 3) More than 50% of the dominant vegetative species have an indicator status of Facultative-Upland (FACU), and the community therefore does not meet the criteria for hydrophytic vegetation (which requires that more than 50% of the dominant species have a status of Facultative (FAC) or wetter). The topography is about .45 meters (1.5 feet) above the adjacent wetlands/floodplain. There was no visible evidence of prolonged flooding or saturation. Soil samples revealed a profile of unmottled crumbly, black, debris containing roots and twigs, to a depth of about 15 cm (6 in). The soil profile from 15-36 cm (6-14 in) was a crumbly, moist silt including pebbles and gravel, 2.5Y4/3 in color, with no mottles. Soils appear to be fairly well drained; no saturation was observed within 35 cm (14 in) of the surface on any sample. There are no positive field indicators (e.g. low chroma, mottling, streaking, odors, concretions) to suggest hydric conditions. Page 2 S.R. 3001, Section 01B Lehigh County Due to the lack of hydrophytic vegetation, hydrology, and wetland soil, his area does not contain jurisdictional wetlands. B. Wetland The wetland area was delineated based on a clear topographic break and change in dominant vegetation. (See photo 4) The dominant plant species consist of spotted touch-me-not (Impatiens capensis), goldenrod sp., broadleaf cattail (Typha latifolia), and silky dogwood (Cornus amomum). More than 50% of the dominant species have an indicator status of Facultative (FAC) or wetter, and the community