233 D St NW, Auburn, WA 98071


Ecology invites you to review and comment on the periodic review for Custom Built Metals located at 233 D Street Northwest, Auburn, Washington.


A periodic review is conducted every five years following a cleanup action when institutional controls are used as part of the remedy, as required by the Model Toxics Control Act (MTCA). The purpose of the periodic review is to evaluate current site conditions and to ensure continued protection of human health and the environment.

Ecology will review comments received during the comment period and make recommendations for suggested changes. The periodic review will become final if no significant changes are made. An additional public comment period will be held if significant changes are made.

Please submit comments through Ecology’s Online Comment Form or mail your written comments to Tamara Welty at 3190 160th Ave S.E., Bellevue, WA 98008. To request ADA accommodation, call Ecology at 360-407-6831, 711 (relay service), or 877-833-6341 (TTY). More about our accessibility services.

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The Custom Built Metals site is located at 233 D Street Northwest, Auburn, Washington.  It is an industrial property consisting of two lots, formerly occupied by the Custom Built Metals Company. The Site was contaminated from historical operations and activities by total petroleum hydrocarbons of diesel, oil and gasoline and associated compounds of benzene, toluene, ethylbenzene, xylenes (BTEX) and naphthalene as well as carcinogenic polycyclic aromatic hydrocarbons (cPAHs), polychlorinated biphenyl (PCBs A1254), cadmium and lead.

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Excavation of contaminated soils was conducted in 2001 and 2002. However, contaminated soils remain beneath the warehouse building and possibly the adjoining ramp in Lot 1. Further excavation in those areas was not practicable due to risking significant structural damage to Site buildings and infrastructure.  A restrictive covenant was placed on the property in 2003 to prohibit activities that might result in exposures to the contaminants.


Institutional controls through a restrictive covenant were implemented at the Site as part of the cleanup action, which restricts activities that might result in exposures to the contaminants. Ecology issued a partial sufficiency No Further Action (NFA) determination for the Site in 2008 through the Voluntary Cleanup Program (VCP), and required further action to evaluate groundwater quality at the Site. 


Following four consecutive quarters of groundwater monitoring in 2008-2009, a complete NFA was issued in 2010. This NFA determination required additional groundwater monitoring. An additional four consecutive quarters of groundwater monitoring were conducted in 2011-2012 and one groundwater monitoring event was conducted in 2018.


No contaminants of concern exceeded cleanup levels during the various monitoring events, with the exception of dissolved lead in one groundwater monitoring well during one of the 2009 sampling events. Since that time, there has been six groundwater monitoring events where lead concentrations were well below the cleanup level.


Map showing site location as King County, WA SITE INFORMATION


View Electronic Documents

Site Summary Report

Facility Site ID: # 77573648

Cleanup Site ID: 1070

Auburn, King County

Status: No Further Action   Get definitions of Status terminology

Comment Period:
JANUARY 03, 2019 - FEBRUARY 04, 2019

Tamara Welty
Site Manager
(425) 649-7023

Document Repositories:

Northwest Regional Office
3190 160th Ave SE
Bellevue, 98008-5452