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Site 8: Cape Flattery DumpSite History and Background
The Cape Flattery Dump is an inactive dump site on a steep hillside at the edge of the Cape Flattery Road across from a rock quarry. The dump was started by the Makah AFS when the USAF was first stationed at Neah Bay in the late 1940s or early 1950s (Claplanhoo, 1994) and may contain hazardous materials. The rock quarry across from the dump may have been used by the Makah AFS to burn high-detergent lubricant (LaChester, 1994). No waste is visible on the roadside, but metals and other waste materials remain on the steep hillside, which is heavily forested. Debris from the dump extends to Ocean Creek, which borders it to the southeast (Ridolfi, 2004a). It is not known when the dump became inactive. Contamination associated with materials deposited at the dump may have impacted soil and surface water at the site. Activities to Date
The Makah Environmental Restoration Team performed site inspections in October 2000 and in March and April 2004, and the site was one of 10 sites investigated during the 2004 limited remedial investigation (Ridolfi, 2005d). Surface water and sediment samples were collected from Ocean Creek in March 2006. 2004 Limited Remedial InvestigationTwo soil samples were collected: one from within the waste material near the top of the hillside and the other near the bottom of the hillside, north of Ocean Creek. The samples were analyzed for gasoline-, diesel , and lubricating oil-range hydrocarbons, BTEX compounds, chlorinated pesticides, PCBs, PAHs, and metals from the USEPA Target Analyte List. Diesel- and lubricating oil-range hydrocarbons, PAHs, and metals were detected below screening levels in both soil samples, and toluene and xylenes were detected in the sample from the top of the hill. Of the detected analytes, only arsenic, chromium, iron, and lead were detected at concentrations above screening levels. The lead result for the sample from the top of the hillside exceeded the screening level and was relatively elevated compared to most of the lead results for other samples collected during the limited remedial investigation. The concentrations of arsenic, chromium, and iron were less than or equal to the Puget Sound natural background concentrations in soil (Ecology, 1994) and are not believed to represent contamination associated with the dump. 2006 Annual SamplingDuring March 2006, the Makah Environmental Restoration Team conducted a sampling event at the Cape Flattery Dump. This sampling event was the first in a series of monitoring events that will be conducted to evaluate potential contamination pathways at the site, as planned in the SPIP (Ridolfi, 2005e). One sediment and one surface water sample were collected from Ocean Creek, which flows through the site. Metals were the only constituents detected. Aluminum, barium, calcium, iron, magnesium, manganese, potassium, sodium, and zinc were detected in both the sediment and surface water sample. Arsenic, beryllium, chromium, cobalt, copper, lead, and vanadium were detected in only the sediment sample. Zinc was detected in the sediment sample at a concentration that exceeded the screening level. All other metals detected in the sediment and surface water samples were either at concentrations below the screening level or do not have screening levels available for comparison (Nicholls and Hilgart, 2006c). Diesel-, motor oil-, and gasoline-range hydrocarbons, PAHs, PCBs, and pesticides were not detected above the laboratory reporting limits in either the surface water or sediment samples (Nicholls and Hilgart, 2006c). Additional Information: |
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