Environmental Cleanup Site Information (ECSI) Database
Site Summary Full Report - Details for Site ID 5694, 4th Main

This report shows data entered as of June 20, 2013 at 12:48:53 AM

This report contains site details, organized into the following sections: 1) Site Photos (appears only if the site has photos); 2) General Site Information; 3) Site Characteristics; 4) Substance Contamination Information; 5) Investigative, Remedial and Administrative Actions; and 6) Site Environmental Controls (i.e., institutional or engineering controls; appears only if DEQ has applied one or more such controls to the site).  A key to certain acronyms and terms used in the report appears at the bottom of the page.

Go to DEQ's Facility Profiler to see a site map as well is information on what other DEQ programs may be active at this site.

Site Photos
Click to View Photo	Picture Date	Caption	Size
View Photo	08/29/2012	Leaking heating oil tank found below the former post office building. Dark soil is likely contaminated.	801 Kb

General Site Information
Site ID: 5694	Site Name: 4th Main		CERCLIS No:
Address:	350 E Main St. Hillsboro 97123
	County: Washington		Region: Northwest
Other location information:
Investigation Status:	Suspect site requiring further investigation
	Brownfield Site: Yes	NPL Site: No	Orphan Site: No	Study Area: No
Property:	Twnshp/Range/Sect: 1N , 2W , 31		Tax Lots: 5200
	Latitude: 45.5225 deg.	Longitude: -122.985 deg.	Site Size: 1.11 acre
Other Site Names:

Site Characteristics
General Site Description:	As of February 2012, the property is developed with a two-story, approximately 5,000-square-foot commercial building that is unoccupied and used for storage. The structure was built in 1954 as a bank branch office. A partial utility basement area underlies the southern fifth of the structure. A below-grade sump is located along the east wall of the basement, which is likely used for water intrusion control with a sump pump. Attached to the eastern exterior of the structure is a canopy and drive-through teller area that was constructed in the 1970s. The remainder of the property is covered with an asphalt-paved parking lot and some landscaping.
Site History:	From the late 1880s through the late 1950s, the subject property was used for mixed residential and commercial purposes. By 1892, it was developed with a residence in the NE portion and a small washhouse or laundry in the north-central area. Three additional residences were present by 1912, located at the east-central, SE and NW portions of the property, and the former washhouse had been replaced with a livery and feed store, which remained onsite through 1936. By 1936, the original (NE) residence was no longer present, and a U.S. Post Office had been constructed in its place. By 1940, the livery/feed store and NW residence had been removed, and an automotive fuel station was present at this area. The fuel station remained onsite through at least 1951. All of the remaining residences and outbuildings were removed in approximately the early 1950s, and the existing building was constructed in 1954 for use as a branch bank. The U.S. Post Office that was formerly present at the NE portion of the property was removed at some time between 1972 and 1979, at which time the existing drive-through teller window and canopy were constructed at the E side of the bank building. The building was used as a bank from its construction in 1954 until it was vacated in approximately 1998. Since 1998, the building has been used for storage.
Contamination Information:	[Excerpt from Jan. 2012 Phase II ESA from Hahn & Associates]: In summary, the four zones of soil contamination discovered at the site encompass a rather large volume of approximately 2,500 cubic yards, of which 500 cubic yards (in the SW Area) may contain chemical concentrations [i.e. for oil and/or benzo(a)pyrene] that would exceed risk criteria for Urban Residential uses of the site. The areas of soil contamination appear to be adequately characterized and delineated. Although the extent of soil contamination potentially present off-site beneath the adjacent SE 4th Avenue right-of-way at the Post Office Area has not been directly determined, its extent to the east is inferred to be limited.
Manner and Time of Release:	Releases of petroleum at the site appear to be historical and largely related to heating oil tanks. Surface contamination may be related to oiling gravel surfaces for dust control. There is little evidence of contamination from the past gas station at the site.
Hazardous Substances/Waste Types:	petroleum hydrocarbons and related chemicals
Pathways:	Direct contact or excavation worker contact and potential vapor intrusion.
Environmental/Health Threats:
Status of Investigative or Remedial Action:	A Remdial Action Work Plan was approved by DEQ in early July 2012. The planned development for the site includes underground parking for future building tenants and much of the footprint of the site will require excavation up to 14 feet in depth. This pre-construction excavation will also accomplish site cleanup. Contaminated soil will be segregated from clean soil and trucked to the nearby Hillsboro Landfill for disposal. There is some potential for contamination to extend offsite into the 4th Avenue right-of-way in the NE corner of the property; this will be evaluated during excavation. Excavation to proposed depths will likely generate groundwater in the pit such that dewatering will be required. Since the groundwater has minor contamination it will be contained for possible treatment before disposal. Excavation is scheduled for late July 2012. (RKW 8/12) Excavation began in late August and a leaking heating oil tank was soon found below the former post office building. The tank was removed for proper cleaning and disposal. The soil contaminated by the tank will be removed as part of the excavation process and confirmation samples will be collected after excavation is complete.
Data Sources:

Substance Contamination Information
Substance	Media Contaminated	Concentration Level	Date Recorded
BENZENE	Groundwater	0.43 ug/L	9/29/2011
BENZO(a)PYRENE	Soil	0.076 mg/kg	9/29/2011
DIESEL - FUEL OIL	Soil	4,280 mg/kg	10/28/2011
LEAD	Soil	268 mg/kg	10/28/2011
OIL OR FUEL RELATED COMPOUNDS	Soil	1,170 mg/kg	10/28/2011

Investigative, Remedial and Administrative Actions
Action	Start Date	Compl. Date	Resp. Staff	Lead Pgm
Site added to database	02/22/2012	02/22/2012	Gerald Gamolo
SITE INVESTIGATION	02/22/2012		Robert Williams	VCS
Prospective Purchaser Agreement	04/04/2012	07/12/2012	Robert Williams	VCS
REMOVAL  (Primary Action)	08/15/2012	11/15/2012	Robert Williams	VCS

Key to Certain Acronyms and Terms in this Report:

• CERCLIS No.: The U.S. EPA's Hazardous Waste Site identification number, shown only if EPA has been involved at the site.
   
• Region: DEQ divides the state into three regions, Eastern, Northwest, and Western; the regional office shown is responsible for site investigation/cleanup.
   
• NPL Site: Is this site on EPA's National Priority List (i.e., a federal Superfund site)? (Y/N).
   
• Orphan Site: Has DEQ's Orphan Program been active at this site? (Y/N). The Orphan Program uses state funds to clean up high-priority sites where owners and operators responsible for the contamination are absent, or are unable or unwilling to use their own resources for cleanup.
   
• Study Area: Is this site a Study Area? (Y/N). Study Areas are groupings of individual ECSI sites that may be contributing to a larger, area-wide problem. ECSI assigns unique Site ID numbers to both individual sites and to Study Areas.
   
• Pathways: A description of human or environmental resources that site contamination could affect.
   
• Lead Pgm: This column refers to the Cleanup Program affiliation of the DEQ employee responsible for the action shown. SAS or SAP = Site Assessment; VCS or VCP = Voluntary Cleanup; ICP = Independent Cleanup; SRS or SRP = Site Response (enforcement cleanup); ORP = Orphan Program.

You may be able to obtain more information about this site by contacting Robert Williams at the Northwest regional office or via email at williams.robert@deq.state.or.us. If this does not work, you may contact Gil Wistar at (503) 229-5512, or via email at wistar.gil@deq.state.or.us or contact the Northwest regional office.

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