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| Title | Screening Survey for Petroleum Contamination at Cornet Bay Marina (Island County) | |||
| Month-Year Published | September 2005 | |||
| Online Availability |
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| Short Description |
Groundwater, surface water, and sediment samples were collected at Cornet Bay Marina to determine if petroleum contaminants from a 1989 fuel release were currently migrating into the adjacent intertidal areas. Groundwater continues to be contaminated, but there was no evidence that it is currently impacting adjacent intertidal sediments. No significant contamination was found in the two streams bracketing the site. Polynuclear aromatic hydrocarbons (PAH) levels exceeded cleanup criteria at all six sampling stations adjacent to the bulkhead, but hydrocarbon identification suggests that the PAHs in the sediments are due to the creosote-treated bulkhead. (Also see abstract below) | |||
| Publication Number | 05-03-033 | |||
| Author(s) | Kinney, K. | |||
| Print Availability | ||||
| Number of pages | 32 + app (76 total) | |||
| Keywords | contamination, county, fuel, groundwater, marina, model, petroleum, sediment, spill, survey, tank, toxic, toxics, water, wells | |||
| Subject Waterbodies |
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| Related Publications | Title | Relationship | ||
| Quality Assurance Project Plan: Cornet Bay Intertidal Contaminant Screening Survey | supporting publication | |||
| Abstract | Long Description |
In 1989, a fuel release from an underground storage tank at Cornet Bay Marina on Whidbey Island contaminated the groundwater. In 2005, groundwater, surface water, and sediment samples were collected onsite to determine if petroleum contaminants were currently migrating into the adjacent intertidal areas. Samples were analyzed for petroleum products including TPH-Gx, TPH-Dx, BTEX, and PAHs. Groundwater continues to be contaminated in two of the monitoring wells, with levels of gasoline, diesel, and benzene exceeding Model Toxics Control Act Method A cleanup levels for groundwater. No significant petroleum contamination was found in the two streams bracketing the site to the north and south. Sediments along the bulkhead showed no evidence of BTEX, gasoline, or diesel, with the exception of one site at the southern end which had low levels of BTEX and diesel. PAHs were detected at all sediment sampling locations. PAH levels were low in the surrounding intertidal area, but exceeded the sediment management standards criteria at all sampling sites along the bulkhead. PAHs exceeded the cleanup screening levels at four of the six stations adjacent to the bulkhead, and the sediment quality standards were exceeded for multiple PAHs at all six stations. The extent to which the spilled petroleum has contributed to the PAH levels observed in Cornet Bay Marina sediments is uncertain. Hydrocarbon ID analysis suggests that the PAHs in the sediments are due to the creosote treated bulkhead. |
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