Reserve Silica Plant
Status Update
Site Background
The Site was developed in the early 1970s to process sand mined from the Reserve Silica Reclamation site, where sandstone was mined from 1968 to 2007. The sand was disaggregated and washed to remove fines. The fines from the process water were deposited in settling ponds on the west side of the Site. The sand processing plant was decommissioned in 2015.
Releases Of Contamination
The draft Remedial Investigation report for the Site identified credible evidence of releases near two former sand processing areas:
- Petroleum hydrocarbons were detected near the 10,000-gallon diesel fuel underground storage tank.
- Petroleum hydrocarbons were detected near former aboveground storage tanks near the hazardous materials storage area.
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Documents 9
Legal 1
Document Title | Document Date | Document Type |
Reserve Silica Plant - Early Notice Letter | 1/22/2020 | Early Notice Letter |
Leaking Underground Storage Tank 1
Document Title | Document Date | Document Type |
Reserve Silica Plant - Underground Storage Tank Site Assessment | 11/23/2020 | LUST - Site Assessment Report |
Technical Reports 7
Places to see print documents
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Solid Waste Program - Northwest Regional Office15700 Dayton Ave NShoreline, 98133This location may only have print documents available during open comment periods.
Contaminants 11
Contaminant Type | Soil |
Groundwater |
Surface Water |
Air |
Sediment |
Bedrock |
---|---|---|---|---|---|---|
Metals - Metals - Other | B | B | ||||
Halogenated Organics - Polychlorinated biPhenyls (PCB) | S | S | ||||
Non-Halogenated Organics - Polycyclic Aromatic Hydrocarbons | C | S | S | S | ||
Metals - Arsenic | C | C | S | S | ||
Metals - Lead | B | B | ||||
Metals - Mercury | B | B | ||||
Non-Halogenated Organics - Benzene | B | B | S | |||
Non-Halogenated Organics - Other Non-Halogenated Organics | B | B | S | |||
Non-Halogenated Organics - Petroleum-Diesel | C | B | S | S | ||
Non-Halogenated Organics - Petroleum-Gasoline | B | |||||
Non-Halogenated Organics - Petroleum-Other | C | B | S | S | S |
- S
- Suspected
- C
- Confirmed Above Cleanup Levels
- B
- Below Cleanup Levels
- RA
- Remediated-Above
- RB
- Remediated-Below
- R
- Remediated