Yarrow Bay Marina
Ecology issued a No Further Action Letter for this site on January 24, 2017.
Site Background
The Yarrow Bay Yacht Basin and Marina is located at 5207 Lake Washington Boulevard NE in Kirkland, Washington (Site), in a mixed-use commercial and residential area. The Site is identified as Tax Parcel No. 172505-9130, which is an irregular shaped lot that consists of approximately 44,797 square feet of commercial property, a portion of which extends into Lake Washington. Site features include a marina with boat repair and fueling facilities.
The source of contamination resulted from historical releases of gasoline and diesel from underground storage tanks (USTs) and associated dispensing system used by the Marina for boat refueling. Gasoline range and diesel range petroleum hydrocarbons (tph-g and tph-d) were found in soil and ground water. Due to the close proximity to the shoreline bulkhead it was also suspected that sediments have been impacted. Additionally, cPAH’s associated with fill material was found during remedial/construction activities outside the footprint of the petroleum hydrocarbon Site.
Remedial activities were conducted in March 2008 during removal of two underground storage tanks (USTs) formerly containing gasoline and diesel fuel to address the identified impacts during the 2006 assessments. The remedial actions included the removal of approximately 200 tons of petroleum and cPAH impacted soil from an area proximate to the current fuel dispenser.
It was necessary to leave petroleum hydrocarbon impacted soil due to structural limitations associated with undermining the marina bulkhead.
Remaining contamination is fully characterized and described below:
Lateral delineation of the petroleum hydrocarbon impacted soil is delineated by the bulkheads to the west and north, and confirmation samples EX1-BTM-PLT (collected at 4 feet bgs), EX1-SD-E (collected at 5 feet bgs), EX1-SD-C (collected at 9 feet bgs) and EX1-SD-W (collected at 6 feet bgs). This laterally delineated area equates to approximately 250 square feet. Assuming the thickness of the soil impacts above the MTCA Method A cleanup levels is 4.5 feet (the difference between the “average” upper interval of impact [6.5 feet] and the lower interval of impact [11 feet - the lowest measured depth of groundwater during drilling]), the remedial area equates to approximately 1,125 cubic feet, or approximately 42 cubic yards.
Quarterly ground water monitoring and sampling began in November 2010. Ground water samples collected during four consecutive quarterly groundwater monitoring and sampling events, completed in June, September and December 2015, and February 2016, did not show concentrations of petroleum hydrocarbons or BTEX compounds above MTCA Method A cleanup levels. Additionally, results of the sediment sampling did not show petroleum hydrocarbons or BTEX compounds above MTCA Method A cleanup levels.
Contaminants Of Concern
Gasoline & Diesel range petroleum hydrocarbons in Soil.
Voluntary Cleanup Program
This site was cleaned up under our Voluntary Cleanup Program, which provides technical help to owners of contaminated sites.
Voluntary Cleanup Program customers pay fees to cover our costs for technical help and reviewing cleanup reports. Sites in this program must meet the same cleanup standards as the sites Ecology manages under legal orders.
Site use restrictions called institutional controls are in effect
Institutional controls can be fences, signs, or restrictions on how the property is used. For instance, an institutional control may prohibit installing drinking water wells or disturbing a protective cap that isolates contamination. These restrictions keep the contamination contained and keep people from being exposed to the contamination. The controls are usually listed in environmental covenants recorded with the county.
Periodic reviews are required when institutional controls are required at a site. Ecology conducts reviews to make sure the controls remain effective and the cleanup still protects human health and the environment. We conduct periodic reviews about every five years.
Institutional Controls 1
Environmental Covenant
Restrictions/Requirements
- Control Stormwater
- Control Vapor/Gas
- Maintain/Protect Monitoring System
- Ongoing Maintenance of Remedy
- Prevent the Reuse or Relocation of Site Soil
- Prohibit Soil Disturbance
- Restrict All Ground Water Extraction/Well Installation
- Restrict Domestic Ground Water Extraction/Well Installation
Restricted Media
- Groundwater
- Soil
Documents 29
Legal 1
| Document Title | Document Date | Document Type |
| Yarrow Bay Marina - NW1791 Environmental Covenant for Site NFA | 12/21/2016 | Environmental Covenant; Alternative Mechanism |
Map 2
| Document Title | Document Date | Document Type |
| Yarrow Bay Marina - NW1791 Site Map with Sediment Sampling Locations | 11/3/2010 | Map |
| Yarrow Bay Marina - NW1791 Site Plan with Sample locations | 1/6/2010 | Map |
Technical Reports 21
Voluntary Cleanup Program 5
| Document Title | Document Date | Document Type |
| Yarrow Bay Marina - NW1791 Site NFA with Environmental Covenant | 1/24/2017 | VCP Opinion on Site Cleanup – NFA |
| Yarrow Bay Marina - NW1791 RI Opinion | 11/3/2010 | Voluntary Cleanup Program Opinion – Other |
| Yarrow Bay Marina - NW1791 Further Action Opinion | 5/3/2010 | Voluntary Cleanup Program Opinion – Other |
| Yarrow Bay Marina - NW1791 Opinion on Proposed CAP map | 1/30/2008 | Voluntary Cleanup Program Opinion – Other |
| Yarrow Bay Marina - NW1791 Opinion on Proposed CAP | 1/30/2008 | Voluntary Cleanup Program Opinion – Other |
Places to see print documents
-
Northwest Regional Office15700 Dayton Ave NShoreline, 98133Please schedule an appointment to view print documents at this location.
Contaminants 6
| Contaminant Type | Soil |
Groundwater |
Surface Water |
Air |
Sediment |
Bedrock |
|---|---|---|---|---|---|---|
| Non-Halogenated Organics - Non-Halogenated Solvents | RB | |||||
| Metals - Lead | RB | |||||
| Non-Halogenated Organics - Benzene | RB | RB | ||||
| Non-Halogenated Organics - Other Non-Halogenated Organics | RB | RB | ||||
| Non-Halogenated Organics - Petroleum-Diesel | RB | RB | ||||
| Non-Halogenated Organics - Petroleum-Gasoline | RB | RB |
- S
- Suspected
- C
- Confirmed Above Cleanup Levels
- B
- Below Cleanup Levels
- RA
- Remediated-Above
- RB
- Remediated-Below
- R
- Remediated