Federal Preliminary Assessment Troh Legacy Landfill 10010 SE Vradenburg Rd. Happy Valley, OR 97086 EPA ID #ORN001002928 June 2011 Prepared For: Joanne LaBaw, Site Assessment Program US Environmental Protection Agency Region 10 Office of Environmental Cleanup 1200 Sixth Ave, Suite 900 Seattle, WA 98101 Prepared By: Sarah Miller Oregon Department of Environmental Quality Environmental Cleanup Division NWR Site Assessment Section 2020 SW Fourth Ave Suite 400 Portland, OR 97201 1 GENERAL SITE DATA Site Name and Address: Troh Legacy Landfill 10010 SE Vrandenburg Rd. Happy Valley, OR 97086 CERCLIS: #ORN001002928 ESCI: #5257 Congressional District: 3 Current Owners: Larry Burright Jr. Debbie Burright 8750 SE 155th Ave Space 6 B Happy Valley, OR 97086 Current Operator: No current operations Site Contact: Larry Burright Jr. Legal Description: Township 1 South, Range 2 East (Willamette Meridian), Section 25D, Tax Lot 00401 East side of tax lot Latitude & Longitude: 45.4488°N, 122.4957°W Directions to site: From downtown Portland, OR: Head east on I-84 for 5miles Take exit 6 to 1-205 southbound- travel 3.6miles Take exit 17 Foster Road Turn left (east) on SE Woodstock for 0.3miles Follow road slight right to SE Foster-travel 3.1 miles Turn right (south) at SE 162nd Ave –travel 1.2 miles Take the 1st right (southwest) onto SE Vradenburg Rd- travel 0.8 miles Turn left (east) onto Airport Rd (gated road/driveway) approx. 0.2 miles Where Airport Rd bends to south, site is located to the NW of this point. 2 Table of Contents 1. INTRODUCTION ..................................................................................................................... 4 2. SITE DESCRIPTION, OPERATIONAL HISTORY, AND WASTE CHARACTERISTICS . 4 2.1 Site Location ......................................................................................................................... 4 2.2 Site Description ..................................................................................................................... 5 2.3 Area History .......................................................................................................................... 5 2.4 Site History and Waste Characteristics ................................................................................. 6 2.5 Ownership ............................................................................................................................. 8 3. GROUND WATER PATHWAY .............................................................................................. 9 3.1 Hydrogeologic Setting .......................................................................................................... 9 3.2 Site Soils .............................................................................................................................. 10 3.3 Ground Water Targets/ Use ................................................................................................ 11 3.3 Ground Water Conclusions................................................................................................. 14 4. SURFACE WATER PATHWAY ........................................................................................... 14 4.1 Hydrologic Setting .............................................................................................................. 14 4.2 Surface Water Targets ........................................................................................................ 14 5. SOIL EXPOSURE AND AIR PATHWAYS .......................................................................... 18 5.1 Local Land use .................................................................................................................... 18 6. SUMMARY AND CONCLUSIONS ...................................................................................... 21 7. REFERENCES ........................................................................................................................ 23 APPENDICES .............................................................................................................................. 26 Appendix A: Site Maps ............................................................................................................. 26 Appendix B: Site Photos ........................................................................................................... 26 Appendix C: Supplemental Information ................................................................................... 26 Table of Figures Table 1: 1971 Troh Site Metrics ..................................................................................................... 6 Table 2: Troh Legacy Landfill Soil type....................................................................................... 11 Table 3: Number of Registered Ground Water Wells near Troh Legacy Landfill ....................... 11 Table 4: Population using Domestic Wells ................................................................................... 12 Table 5: Sunrise Water Authority Blended system....................................................................... 13 Table 6: Drinking Water Providers ............................................................................................... 15 Table 7: Sport harvest Clackamas River, below North Fork Dam (Dam located upstream of Estacada, OR) ............................................................................................................................... 17 Table 8: Sport harvest Willamette River below Oregon City Falls .............................................. 17 Table 9: Population near Troh Legacy Landfill ............................................................................ 18 Table 10: School Populations within 4 mile TDL ........................................................................ 19 Table 11: Sensitive Species near Troh Legacy Landfill ............................................................... 21 3 1. INTRODUCTION Pursuant to a Cooperative Agreement (V-96089701-1) between the US Environmental Protection Agency (EPA) and the Oregon Department of Environmental Quality (DEQ), the DEQ conducted a Preliminary Assessment (PA) of the former Troh Legacy Landfill located near Happy Valley, Oregon. PA’s are intended generally to identify potential hazards at a site, identify sites that require immediate action and to establish priorities for sites requiring in-depth investigations. The PA is based on readily available information about the site and is not a complete investigation or characterization of the site. The former Troh Legacy Landfill PA was conducted to identify potential public health and environmental threats related to the site. The PA is based on data derived from the sources listed in the reference section of this report. The scope of the investigation includes a review of available file information, interviews and an on-site reconnaissance inspection. 2. SITE DESCRIPTION, OPERATIONAL HISTORY, AND WASTE CHARACTERISTICS 2.1 Site Location The former private Troh Legacy Landfill is centered near 45.4488°N, 122.4957°W and occupies Township 1 South, Range 2 East (Willamette Meridian), Section 25D Tax Lot 00401 and approximately 4.9 acres. The eastern 2 acres of the tax lot were known to be actively used as a landfill while the remaining 2 acres were available for future landfill use. According to Metro’s document ‘Our Landfill Legacy’ the owner applied to Clackamas County to permit another nearby 20 acre tax lot approximately 1,500 ft to the south (1S,3E,30C, TL01800) for waste disposal in 1971. Tax Lot 1800 currently is recorded as 15.51 acres and two other tax lots (1801; 2.0 acres, 1802; 2.49 acres) are located within Tax Lot 1800. Records document that it is unlikely this tax lot was ever approved for waste disposal. Therefore, the known landfill location at Tax Lot 401 is the subject of this PA. The Troh Legacy Landfill is located in Happy Valley, Oregon and is on the top and eastern side of Scouter Mountain, part of the Boring Lava Field, which is comprised of many cinder cones and small shield volcanoes east of Portland. The Landfill is located on approximately 2 acres adjacently northeast to the former privately owned Happy Valley airport, locally known as ‘Troh’s Nest’ at an elevation of approximately 750 ft above sea level. The Scouter Mountain Boy Scout Camp is also located approximately 1000 feet to the west of the former landfill. 4 2.2 Site Description The Troh Legacy Landfill operated from 1966 to 1971 and accepted demolition wastes. There are no current regulated operations on site. A residential house is located on the western portion of the tax lot. Current aerial photographs depict the vegetation in the eastern portion of the site as shrubby vegetation whereas the rest of the non-developed portions of the tax lot are covered in evergreen and deciduous trees. 2.3 Area History The Troh Legacy Landfill is located in a transition zone between the conifer forests of the Cascade Mountains and the oak/prairie grasslands of the Willamette Valley. Research into Government Land Office Surveys (GLO) by the Natural Resource Heritage program of the Nature Conservancy indicates that prior to Euro-American settlement Douglas-fir forest and woodland dominated most of the area. The uplands of the lava domes were characterized by closed canopy old growth Douglas-fir, grand fir, and bigleaf maple. Hazelnut, Pacific dogwood, vine maple, and Pacific yew composed the understory. The valley floor was similar, but also