In 1988 DEQ received a report of petroleum contamination in the area of 2nd & Olive Streets. The subsequent investigations lead to the discovery of free-product (or liquid petroleum hydrocarbon - LPH) on the Senz Automotive Service site (also referred to as the “Yamhill Station”) at 210 South Maple St. in Yamhill, Oregon. By July 28, 1995, four underground storage tanks (USTs) and an estimated 450 cubic yards of petroleum contaminated soil had been removed. The four USTs were replaced with an above-ground storage tank (AST) system. In September 1996, a site assessment identified high levels of benzene and other constituents of potential concern dissolved in the shallow groundwater near the western boundary of the property. In November 2006, a petroleum release was reported to DEQ and the Oregon Emergency Response System (OERS) when gasoline was found in storm water catch basins located off the property. An estimated 4,476 gallons of gasoline were lost from the product piping between the AST and the dispensers in the same general area where the previously removed USTs had leaked. Petroleum migrated from leaking lines into the former UST nest and traveled off-site and traveled along same preferential pathways contaminated by the gasoline that leaked from the USTs in 1988. The initial cleanup response to the 2006 AST release resulted in the installation of an on-site LPH collection system (trench). A very limited on-site assessment and LPH mitigation in the city storm-water system was also implemented. The contamination from the two releases may be co-mingled in some areas. Residual petroleum saturation in the soil and high dissolved-phase concentrations in groundwater are known to extend beyond the property boundary. Historic petroleum contamination was observed over one block away during construction of the local fire station in the early 1990s. Further investigation has been conducted both on and off site including an area wide passive soil gas assessment, soil and groundwater probes, and an array of groundwater monitoring wells. Several additional groundwater monitoring wells, temporary probe sampling points, and permanent and temporary soil gas assessment points have been installed on and off-site to complete the delineation and characterization of the contamination. In December 2009 over 3,000 tons of petroleum contaminated soil was removed from the former station following demolition of the building and removal of the above ground storage tank system.
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36-88-4062 |
Basic Incident Information |
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Site Name: |
Senz Automotive Service |
Received Date: |
12/09/1988 |
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Address: |
210 S MAPLE |
Status: |
ACTIVE |
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YAMHILL,
97148
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Tank Type: |
Regulated Tank |
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County: |
YAMHILL |
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Site Type: |
Risk Based Standards |
UST Facility Id: |
273 |
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Project Manager |
Ellen Woods |
Phone Number
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541-606-0490
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Assessment Information |
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Cause of Release: |
UNKNOWN |
Source of Release: |
NOT REPORTED
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Discovery Method: |
OTHER |
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Media Effected |
Contaminants Released |
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>Soil >GroundWater >SurfaceWater >FreeVapor >FreeProduct >Unknown |
>MiscGas >Diesel >Unknown |
| Free Product Removed | YES | Delineate Soil | YES | Delineate Ground Water | YES |
| Soil Delineated | YES | Groundwater Delineated | YES | CAP Requested | YES |
| CAP Submitted | YES | | | | |
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Management Information |
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Release Stopped Date: |
12/09/1988 |
Cleanup Start Date: |
12/09/1988 |
Cleanup End Date: |
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With the security fencing in place, the ARRA contractor and sub-contractor prepare to move ahead with building demolition.
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12/8/2009
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The property owner and friends initiated deconstruction of the building the week before scheduled demolition. Without the support of the roof-truss system, the western wall of the buiildng collapsed.
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12/8/2009
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Much of the building lumber was salvaged during careful demolition.
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1/7/2010
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With the building gone the AST was moved off-site next.
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12/10/2009
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Former Pythian Hall vapor Collection Sytem. Stack on the left ventilates under the building, the right ventilates back yard area.
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9/25/2012
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