Environmental Projects
FREEWAY II STORMWATER SYSTEM ASSESSMENT
Plateau Geoscience Group conducted an assessment of the stormwater collection system at the Freeway II property in southeast Portland, Oregon. The Freeway property is a large industrial property with several tenants operating a variety of businesses including combinations of mixing, storage, and handling areas. The stormwater system collects stormwater from across the site via stormwater catch basins, and sloped paved and unpaved surfaces. The storwater is directed to a stormwater collection pond prior to discharge to Johnson Creek. A report was prepared providing conclusions regarding potential sources of contaminants detected in stormwater, and recomendations for system improvement.
Typical stormwater catch basin.
Swale in center of site that collects stormwater from surrounding sloped unpaved areas.
Gravel sorting operation.
Typical bio debris storage area.
PHASE II ESA SINGER CHEVRON STATION
Plateau Geoscience Group performed a Phase II ESA for the Singer Chevron gas station site located in Walla Walla, WA. A gas station has operated at this site since 1930. The Phase II ESA was to investigate whether petroleum hydrocarbons detected in shallow soil have impacted underlying groundwater. Three groundwater monitoring wells were installed on the site. The soil borings were logged, soil samples collected, and water table monitoring wells installed. Seven quarters of groundwater monitoring was performed to evaluate presence and potential migration of petroleum hydrocarbons that were detected in groundwater. The site has received a no further action determination from the Washington Department of Ecology.
Shallow groundwater monitoring well in center photo.
Contact with petroleum hydrocarbon contaminated soil (gray-black soil to left).
Well purging prior to sampling groundwater.
PHASE I ESAS FOR TRIMET MILWAUKIE LINE
Plateau Geoscience Group, under contract to Landau Associates of Portland, Oregon, completed Phase I ESAs for properties along the to-be-developed TriMet Milwaukie Line. The two properties evaluated are located along McLoughlin Boulevard in Milwaukie, Oregon. At the time of the work, one property includes two businesses, an operating restaurant and a pub, and the second property was vacant and undeveloped. Both properties are located in an area of mixed residential and commercial uses. An abandoned Portland Traction Company trolley line borders both properties. A historic stream flows through stormwater lines in a portion of the vacant property. No recognized environmental conditions were identified for either property.
Vacant property with restaurant property in distant view.
Abandoned Portland Traction Company trolley line in left center of photo.
PHASE I ESA SHELL STATION AT FISHER’S LANDING
Plateau Geoscience Group completed a Phase I ESA for a Shell gas station located on Cascade Park Drive in Fisher’s Landing area of Vancouver, WA. The Shell station is located in a highly developed area, surrounded by commercial properties, and is a paved and operating gas station. The results of the Phase I ESA indicated no recognized environmental conditions, or historic recognized environmental conditions are associated with this property.
Pump island with nearby storm drain.
Bioswale along southern margin of property.
Sump with oil/water separator.
PHASE I ESA CALVIN ENDERLIN ESTATE
Plateau Geoscience Group completed a Phase I Environmental Site Assessment of the Calvin Enderlin Estate located in Amboy, WA, for Stanford University. The property was gifted to Stanford University by the Calvin Enderlin Estate. The property is located in an area underlain by Pleistocene alpine glacial sediments and Tertiary and Quaternary volcanic and volcaniclastic rocks. The results indicated no recognized environmental conditions on the property.
View northeast of typical shrub and grass groundcover. Highlands along northern margin of Chelatchie Prairie Valley visible in distance left of photo.
Subrounded to rounded gravel derived from Pleistocene apline glacial sediments.
PORT ANGELES, WA, GROUNDWATER MONITORING
Plateau Geoscience Group provided field support to GeoPro LLC for their project in Port Angeles, WA. Field tasks included performing groundwater monitoring of five shallow wells installed at the project site along a main street in downtown Port Angeles. Monitoring included obtaining water level measurements, conducting purging of the wells, and sampling groundwater with a peristaltic pump. Sampling groundwater is part of an ongoing site groundwater monitoring program.
Peristaltic pump tubing for sampling of shallow groundwater.
HISTORIC COLUMBIA RIVER HIGHWAY SPILL
Plateau Geoscience Group provided sediment sampling of a spill that occurred in a wetland area along the Historic Columbia River Highway Trail being constructed by Tapani Underground. A truck slid over the edge of the graveled road subbase into the wetland with release of fuel to soil, sediment and water. Plateau conducted sediment sampling to confirm cleanup of the spill. Results of analytical testing indicated no detection of petroleum hydrocarbons above Oregon Department of Environmental Quality risk based screening levels.
Protective fencing, wattle and spill pads placed after cleanup of truck spill area.
Sediment sample location adjacent to flowing stream in wetland.
CALBAG METALS COMPANY 2495 NW NICOLAI
Calbag Metals Company operates a non-ferrous metals recycling business at 2495 NW Nicolai Street, in Portland, Oregon. Several large storage and processing buildings, including the primary business operations building, and open and covered scrap metal storage areas are located on the paved property. The site was issued a No Further Action from Oregon Department of Environmental Quality in May 2013. Plateau Geoscience Group provided field and documentation support to GeoPro LLC for preparation of a Focused Feasibility Study, and a stormwater Source Control Evaluation report. Services for this project included data compilation and analysis, evaluation of ecological and worker exposure to onsite soil and groundwater contamination, assistance to develop proposed remedial alternatives, assistance to evaluate stormwater data, and assistance in preparation of Focused Feasibility Study and Source Control Evaluation reports. Plateau also provided field assistance for monitoring during construction of revisions to the onsite stormwater collection system.
CALBAG METALS COMPANY 2500 NW NICOLAI
Calbag Metals Company operates a metals recycling warehouse at 2500 NW Nicolai Street, in Portland, Oregon. The warehouse was constructed in 1949 on undeveloped property and has been in use continuously at the site. In 2010 a voluntary cleanup investigation was performed and a No Further Action was issued by Oregon Department of Environmental Quality in August 2011. Plateau Geoscience Group provided technical and documentation support for a stormwater Source Control Evaluation report. Plateau compiled and evaluated soil and shallow groundwater data, and evaluated beneficial water uses for shallow groundwater beneath the site. Soil data were compared to Oregon Department of Environmental Quality (DEQ) Joint Source Control Strategy and Risk Based Concentration screening levels. Soil contamination concentrations exceeding screening levels were identified as isolated to an area beneath the current warehouse floor slab. No beneficial uses of shallow groundwater were identified. The Source Control Evaluation is under review by Oregon Department of Environmental Quality.
OSERAN PROPERTY
Plateau Geoscience Group provided field and documentation support for a site investigation and source control evaluation report for the Oseran Property, located at 2245 and 2258 NW Suffolk Street, in Portland, Oregon. Field tasks included logging soil borings, collection of soil samples, installation of shallow groundwater monitoring wells, and groundwater monitoring. Plateau evaluated soil and groundwater logging and sample data to provide interpretation of stratigraphy and water-bearing zones present beneath the site. In addition, Plateau modeled potential migration of contaminants that were detected in shallow groundwater to the Willamette River using the 2-D program Biochlor. Site-specific data and regional appropriate groundwater parameters were used to model migration of contaminants from three onsite shallow monitoring wells. The site is currently under consideration for a No Further Action by Oregon Department of Environmental Quality.
The NEX Gas Station is located in the Jackson Park Housing Complex and Naval Hospital Bremerton Site, in Bremerton, WA. Plateau Geoscience Group provided field support to Tetra Tech EC, Inc., for their implementation of the Data Gaps Investigation Plan, Operable Unit 1. Plateau assisted in logging soil borings and interpretation of glacial stratigraphy, water-bearing zones, and presence of petroleum hydrocarbon contaminants. Past leaks at the NEX Gas Station resulted in contamination of soil and groundwater with a plume of dissolved petroleum hydrocarbons potential seeping into Ostrich Bay some 400 feet east of the site. Plateau performed logging of eight soil borings ranging from about 20 to 100 feet in depth, and prepared a written summary of materials encountered and observations made regarding presence of non-aqueous phase liquid in each boring. The data gaps investigation was to confirm the lateral extent of groundwater impacts adjacent to and downgradient from the NEX Gas Station pump island.
Glacial Till (diamicton)