Corridor-Level Environmental Site Assessment - City of Port Orchard

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MOSQUITO FLEET TRAIL PROJECT • Port Orchard, Washington follows the shoreline around the Westbay Shopping Center and then spans the mouth of Blackjack Creek via a bridge approximately 125 feet in length (of which 100 feet will be over water). From Etta Turner Park on the east side of Blackjack Creek, the trail will primarily be located adjacent to the shoreline all the way to its eastern terminus at the Annapolis Ferry Dock. Exceptions will occur in some places where existing residences built on overwater structures extend waterward beyond the ordinary high water mark/mean higher high water (OHWM/MHHW). At these locations, the trail will remain adjacent to Bay Street. Due to spatial constraints between Bay Street and the shoreline, much of the eastern length of the trail will need to be cantilevered over water and support piles will be required in a few places. Property acquisition for the project consists of the following: ■ ROW acquisition between Station 18+90 and 20+80. ■ ROW acquisition between Station 65+50 and 69+80. A property easement will be acquired for the remainder of the trail that is not located along the existing ROW. General construction activities consist of the following: ■ Surface grading and paving throughout the corridor except as noted below. ■ Repair and replacement of existing deck and boardwalk surfacing near stations 9+00 and 11+00. ■ Fill placed beneath trail near Station 25+82. ■ Bridge foundation over Blackjack Creek consisting of four 16-inch-diameter steel piles (two each side) placed in upland locations, with a concrete foundation. In addition, a utility pole and two guy anchors will be relocated and replaced in-kind. ■ Pile installation and removal is necessary for renovation of an existing deck that will support the trail. • Approximately 21 existing wooden and concrete piles of varying sizes (ranging from 8 inches to 15 inches in diameter) that will be removed at trail station 62+40 to 63+00. These piles will be replaced with 10-inch-diameter steel piles and a more efficient support structure resulting in fewer piles needed in the final construction (up to five replacement piles). • Approximately eight new piles will be placed below OHWM/MHHW for trail support at trail station 63+10 to 64+70. • Three additional new piles are proposed for trail support between two residential structures at trail station 54+70 to 55+10. There is also potential to relocate an existing deck (currently supported by three timber piles) that would require two additional steel piles. Subsurface Conditions The geologic information reviewed within the project vicinity includes Department of Natural Resources 100,000 scale surface geology electronic data. The Corridor is composed of artificial fill, nonglacial continental sedimentary deposits and glacial deposits (see Figure 2). May 23, 2011 | Page 3 File No. 12309-009-00
MOSQUITO FLEET TRAIL PROJECT • Port Orchard, Washington The western portion of the corridor is identified as artificial man-made fill (Qf). The fill appears to extend from the western extent of the corridor to approximately 900 feet east of Blackjack Creek. The composition of the fill is unknown. The central portion of the corridor is identified as nonglacial continental sedimentary deposits (Qc). The Qc deposits extend east of the Qf deposits to the northern extent of the corridor. The Qc deposits typically consist of stratified clay, silty sand, gravel, and peat of fluvial, deltaic, lacustrine or estuarine in origin. The eastern portion of the corridor is identified as undifferentiated drift (Qgu) and glacial advance outwash (Qga). The Qgu unit typically consists of till and outwash sands and gravels. Till is unsorted highly compacted mixture of clay, silt, sand and gravel that has been overridden by a glacier. Outwash consists of compacted (advance - Qga) and non-compacted (recessional) glacial fluvial sand and gravel and lacustrine clay, silt and sand. Based on the topography of the area, groundwater likely flows towards the Bay with a slight variation in the vicinity of Blackjack Creek where groundwater is expected to flow towards the creek. EXISTING CONDITIONS Sites of Concern Hazardous material sites of concern are located adjacent to the project area. The following section provides more information on sites identified that pose a risk to the project area. Of the sites retained for in-depth analysis, the probability of contamination was assessed to evaluate whether the site would be “low risk,” “moderate risk” or “high risk” with respect to the presence of contamination potentially impacting the construction and increasing the liability associated with ownership. Risk was determined using best professional judgment while taking into consideration each sites distance from the project area, impacted media, suspected chemicals of concern and hydraulic gradient. Sites were determined to be “low risk” if a potential concern exists because of historical activities, but either the site will not likely impact the project or the contamination was previously remediated. Sites were determined to be “moderate risk” if a concern exists because of historical activities, and/or the site may likely impact the project but sufficient evidence is not available. Sites were determined to be “high risk” if a known concern exists because of historical activities, contamination is known and extensive and/or the site will likely impact the project. Four low-risk sites, two moderate-risk sites and no high-risk sites were identified during our study. A brief description of each site is outlined in Table 1. The locations of the sites are shown in Figures 3 through 7. Page 4 | May 23, 2011 | GeoEngineers, Inc. File No. 12309-009-00
Page 1 and 2: Corridor-Level Environmental Site A
Page 3 and 4: Table of Contents INTRODUCTION ....
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Page 13 and 14: Geologic Units Qa Qc Qc(w) alluvium
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Page 17 and 18: 52+00 53+00 54+00 LAWRENCE ST Path:
Page 19 and 20: APPENDIX A References
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Page 25 and 26: Overview Map Report 965 page 2
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Government Record Tracking Database
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Map Class: Use Contact Number: Gove
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APPENDIX C Report Limitations and G
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MOSQUITO FLEET TRAIL PROJECT • Po
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Corridor-Level Environmental Site Assessment - City of Port Orchard

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