Volume 2: Draft Gorst Planned Action Environmental Impact Statement

GORST PLANNED ACTION EIS | AFFECTED ENVIRONMENT, SIGNIFICANT IMPACTS, AND MITIGATION MEASURESWatershedAccording to the regulatory database review, the following facilities are located within the Gorst Creek Watershedwhich are either known or suspected to have released hazardous materials into soil or groundwater:• Victory Station Landfill – This facility is located at Victory Drive Southwest and State Route 3. Conventionalinorganic contaminants, conventional organic contaminants, halogenated organics, Priority Pollutant metals,and unspecified petroleum products are suspected in soil and groundwater, and Priority Pollutant metals aresuspected in surface water. This facility is reportedly awaiting cleanup. It is considered a SubstantiallyContaminated Site.• Airport Auto Wrecking I – This facility is located at 6504 Southwest Old Clifton Road. Priority Pollutant metals,unspecified petroleum products, and polynuclear aromatic hydrocarbons have been confirmed in soil and aresuspected in groundwater, and surface water and halogenated organics and non-halogenated solvents aresuspected in soils. This facility is reportedly awaiting cleanup. It is considered a Substantially ContaminatedSite.• Washington Cedar and Supply Company – This facility is located at 4041 West State Highway 3. Gasoline,diesel, and other petroleum have been confirmed in soil. Cleanup at this facility is reportedly underway. Thisfacility is considered a Reasonably Predictable Site.In addition, nine hazardous waste generators (one of which is located in the SKIA UGA), four facilities withUnderground Storage Tanks ([USTs]; one of which is located within the SKIA UGA), and one facility which storesthreshold quantities of hazardous materials under the Emergency Preparedness and Community Right to Know Actwere identified within the Gorst Creek Watershed (but outside of the Gorst UGA). These facilities were not listedon contamination-related databases and are considered Sites with No Apparent Risk. (Ecology 2013).Gorst UGAAccording to regulatory database review, numerous existing and historical commercial/industrial facilities withinthe UGA are either known or suspected to have released hazardous materials into the soil or groundwater. Thesesites are shown on Figure 3.6-1 Gorst Creek Watershed: Hazardous Materials Sites.Many sites in the UGA are reported as storing hazardous substances or waste (i.e., Resource Conservation andRecovery Act [RCRA] generators) in quantities large enough to trigger federal or state regulation. However, unlessa known or suspected release or contamination is listed on the appropriate federal or state databases, the site isconsidered a Site with No Apparent Risk. Only Reasonably Predictable Sites and Substantially Contaminated Sitesare included in this discussion and shown in Figure 3.6-1 Gorst Creek Watershed: Hazardous Materials Sites.Reasonably Predictable Sites are listed in Table 3.6-1 Reasonably Predictable Sites within the Gorst UGA. Thedatabase review showed historical contamination on these sites that is currently known and is being overseen byEcology or another appropriate regulatory agency. Substantially Contaminated Sites are listed in Table 3.6-2Substantially Contaminated Sites with the Gorst UGA. The database review or previous environmentalinvestigations showed reported contamination at these sites that could pose a health or economic risk.As shown in Table 3.6-1 Reasonably Predictable Sites within the Gorst UGA, contaminants of concern (gasoline,diesel, and other petroleum) were identified for only two of the Reasonably Predictable Sites, the Gorst Gas Martand Washington Cedar and Supply Co. Releases from USTs at these sites have resulted in contamination of soil andgroundwater. The remaining sites on this list are either of unknown status or have been cleaned up.As shown in Table 3.6-2 Substantially Contaminated Sites with the Gorst UGA, there are seven SubstantiallyContaminated Sites within the Gorst UGA. Contaminants from these sites consist of arsenic, inorganic and organicconventional contaminants, halogenated organics, lead, mercury, metals, non-halogenated solvents, petroleumproducts, polycyclic aromatic hydrocarbons, organics, pesticides, PCBs, and benzene. Contaminants have beenconfirmed or are expected in soil, groundwater, and surface water. With the exception of Valley Produce, forDraft | June 2013 3-85