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Environmental Cleanup Site Information (ECSI) Database Site Summary Report - Details for Site ID 4413, Lakeside Reclamation Landfill

This report shows data entered as of June 19, 2018 at 10:42:10 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.

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Environmental Cleanup Site Information (ECSI) Database Site Summary Report - Details for Site ID 4413, Lakeside Reclamation Landfill

Site Photos
Click to View Photo Picture Date Caption Size
View Photo 04/15/2015 Spring 2015 249 Kb
View Photo 04/30/2002 Air photo view from April 30, 2002. 164 Kb
View Photo 05/22/1994 Early photo showing dense planting of poplar trees around the south perimeter of the landfill. The first trees were apparently planted in 1992. 98 Kb
View Photo 06/01/2005 Lakeside Reclamation Landfill located on ODOT Highway Map of Washington County 144 Kb
View Photo 06/01/2005 Lakeside Reclamation Landfill located on USGS 7.5-minute Topo Map 115 Kb
View Photo 06/02/2005 Lakeside Reclamation Landfill depicted in 2000 air photo. 82 Kb
View Photo 07/02/2005 Air photo view from July 2, 2005 148 Kb
View Photo 07/14/2014 Air photo from July 14, 2014. Several forested areas now contain closed canopy poplar forest cover. 181 Kb
View Photo 07/15/2016 Lakeside Landfill in July 2016. Note the small white dots visible throughout the photo which are cardboard weed barriers placed around newly planted trees. 265 Kb
View Photo 07/23/2008 Air photo from July 23, 2008 237 Kb
View Photo 08/07/2013 Aerial view of the landfill in October 2009, looking north with the Tualatin River in the foreground. 982 Kb
View Photo 08/12/2013 Another aerial view of the landfill in October 2009, looking east. 907 Kb
View Photo 08/12/2013 DEQ site visit in August 2013. Mature poplar and pine tree grove on the west side of the landfill. 731 Kb
View Photo 08/12/2013 DEQ site visit in August 2013. Young sapling pines on the recently planted top of the landfill surface. Looking west. 713 Kb
View Photo 08/29/2013 Young pine trees growing on the west side of the landfill. 63 Kb
View Photo 08/29/2013 Young pine trees growing on the upper east slope of the landfill. 106 Kb
View Photo 08/29/2013 Tualatin River immediately below landfill. 88 Kb
View Photo 08/29/2013 Failing, old poplar trees on the lower west slope of the landfill. 93 Kb
View Photo 09/19/2011 The hole dug for the lysimeter. Dimensions: 8 x 16 x 5 feet deep. 756 Kb
View Photo 09/23/2011 Completed lysimeter with two small pine trees planted within the instrumented basin. 809 Kb
View Photo 11/05/2014 Lysimeter with mature pine trees 230 Kb
View Photo 12/29/2014 West side gully with small pines in 2009 166 Kb
View Photo 12/29/2014 West side gully with larger pines in 2014 248 Kb
View Photo 12/29/2014 Poplar trees near east side road in 2009 276 Kb
View Photo 12/29/2014 Poplar trees near east side road in 2014 255 Kb

General Site Information

Site ID: 4413 Site Name: Lakeside Reclamation Landfill CERCLIS No:
Address: 14930 SW Vandermost Rd. Beaverton 97007
  County: Washington Region: Northwest
Other location information: Township 2 S, Range 2 W, Section 12 A and D. Tax lots 100 (reference parcel 2S212 00100) and 2302 (reference parcel 2S21200 02302) of T2S/R2W-S12, and tax lot 900 (reference parcel 2S10700 00900) of T2S/R1W-S7 . Located near Kinton, on the northern bank of the Tualatin River, and on the western foothills of Bull Mountain. The peak of Bull Mountain lies 2.1 miles east-northeast of the site; King City lies about 0.75 to the east; Beaverton lies about 1.5 miles to the northeast; Sherwood lies about 2.5 miles south-southeast. Ponzi Vineyards borders the site on the east and northeast. SW Scholls Ferry Road (Hwy 210) lies about 0.5 mile north of the site. Clark Hill lies 1.15 miles to the west-northwest. The site is 126.2 acres, overall; the actual landfill area as of 2004 is claimed to be 32.6 acres.
Investigation Status: Listed on CRL or Inventory
Brownfield Site: No NPL Site: No Orphan Site: No Study Area: No
Property: Twnshp/Range/Sect: 2S , 2W , 12 Tax Lots: 100, 2302, 900
  Latitude: 45.4108 deg. Longitude: -122.8699 deg.  Site Size: 126.2 acres
Other Site Names:
  Grabhorn Landfill

Site Characteristics

General Site Description: A permitted, (closed in 2009) limited purpose, unlined demolition and land clearing debris landfill facility that has operated since approximately 1953. The landfill currently occupies an area of approximately 33 acres with a site development plan anticipating a full build-out of 43 acres. The 1200 foot long southern boundary of the landfill is setback from the Tualatin River approximately 75 feet.
Site History: The landfill began operation in the mid 1950s, but solid waste facilities in the State of Oregon were not required to be permitted by DEQ until 1972. After the permitting requirements went into effect, Grabhorn Incorporated and obtained an operating permit for the Lakeside Reclamation Landfill from DEQ in 1972. The 1972 permit application indicates the landfill footprint was approximately 7 acres in area and the fill composed primarily of construction/demolition debris and tree prunings. Over the years, Lakeside has received DEQ authorization on a case by case basis to take limited amounts of non-putrescible, non-hazardous industrial wastes. However, since the Solid Waste Disposal Permit was issued for the site, periodic compliance inspections noted disposals of un-permitted materials, which were removed if required by DEQ. In 1987 groundwater monitoring Wells were installed to assess the landfill’s influence on groundwater quality. There have been several expansions of the well network and monitoring continues on a semi-annual basis. In 1990, with DEQ’s approval, Grabhorn Inc. began installing an evapo-transpiration (ET) cap on closed portions of the landfill. As of June 2011, the ET cover, vegetated with shrubs, poplar and pines trees now covers the full landfill footprint, although certain areas of the cover exhibit poor plant health. Since the late 1990s, a portion of the facility has been used for a composting operation that is permitted by DEQ under a separate solid waste facility permit.
Contamination Information: (9/24/07 HDL/SRS) Groundwater monitoring at the facility indicates historic and on-going releases of landfill leachate are impacting groundwater quality beneath and directly downgradient of the facility. Contaminant levels, in excess of screening levels considered protective of aquatic organisms, have been consistently measured in river-front wells located immediately downgradient of the landfill. These monitoring results suggest that groundwater contamination potentially threatens aquatic life in the Tualatin River.

Groundwater has been contaminated with concentrations of nitrates and arsenic, periodically exceeding Drinking Water Maximum Contaminant Levels (MCLs) protective of human health. It is uncertain whether the elevated nitrate levels are attributable to leachate releases from the landfill. Groundwater beneath the landfill, however, is not used for drinking water.

Groundwater concentrations of manganese, nitrate, arsenic, zinc, benzene, chloroform, 1,1-dichloroethane, tetrahydrofuran have periodically exceeded EPA Region 9 Tap Water goals for protecting human health.

Undiluted, groundwater concentrations of aluminum, copper, mercury, zinc, and possibly chromium (depending on oxidation state) have periodically exceeded the federal recommended CMC (acute toxicity) for freshwater aquatic life. However, groundwater undergoes substantial dilution as it discharges to the Tualatin and it is uncertain that contaminant levels in groundwater are sufficiently high to adversely impact the river ecology.

Groundwater concentrations of alkalinity, ammonia, chloride, pH, boron, iron, manganese, lithium, aluminum, barium, nickel, silver, vanadium, zinc, carbon disulfide, toluene, and xylenes have sporadically exceeded either DEQ's Level II Ecological Risk Assessment Screening Values for freshwater aquatic life or the federal recommended CCCs (chronic toxicity) for freshwater aquatic life. However, groundwater undergoes substantial dilution as it discharges to the Tualatin and it is uncertain that contaminant levels in groundwater are sufficiently high to adversely impact the river ecology.

In addition to construction and land clearing debris, DEQ approved of Lakeside’s acceptance of non-hazardous industrial waste sludge from the Tektronix wastewater treatment plant (1980), aluminum oxide grit used to polish Tektronix fiberglass circuit boards, copper-contaminated pre-filters from the Tektronix chelate fluoride ion exchange system, and copper-contaminated dust collector material from the Tektronix fiberglass circuit board drilling operations (1983).

Since Lakeside began operating under a permit DEQ Solid Waste permit compliance inspections have noted a variety of prohibited materials in the fill, including auto tires, a smashed auto body, cafeteria wastes, household garbage, a substance used for heat-treating metals, closed paint cans, oil filters and jugs of used motor oil, and electric fans. Other wastes that were approved for disposal at the landfill by DEQ included casting sands, baghouse dust, and slag from Western Foundry (ECSI #185), and chromium-containing sludge ash from the USA Durham STP. Casting sands from Western Foundry are known to have contained zirconium which has low level nuclear radiation. Dusts associated with Western Foundry operations have contained elevated concentrations of arsenic, cadmium, chromium, copper, lead, and zinc.

DEQ issued the site a Notice of Non-Compliance (NON) in 2002 for unauthorized disposal of 630 tons of contaminated soils and chromium-treated animal hide splits originating at the Frontier Leather site (ECSI #116). The soils and hide splits were subsequently removed and sent to Hillsboro Landfill for disposal.

Because of large volumes of land clearing debris, including tree stumps, multiple historic reports of small quantities of wet garbage (1978-85 compliance inspections; 1992 NON; 2002 NON, it seemed very plausible that the landfill may be generating methane gas. DEQ has required that the landfill evaluate gas generation using four probes installed in August 2007. Preliminary results demonstrate the need for at the least gas monitoring at the perimeter and around onsite structures. Evaluation will continue to determine the types of gas controls that the landfill will need.

(3/21/07 HDL/SRS) An examination of groundwater data and information collected over the last fifteen years indicates groundwater flows predominantly to the south directly discharging to the Tualatin River. Nearing the river, groundwater flow paths are deflected to the southwest, likely the result of leakage from holding ponds located in the southeast portion of the facility. Groundwater quality data indicates that groundwater beneath the landfill has been impacted by leachate seeping from the unlined waste disposal areas. Contaminants and general water quality impacts observed are predominantly non-hazardous in nature (with respect to human health). The most notable impacts are elevated levels of total dissolved solids (TDS), chloride, iron, manganese, and zinc and the depletion of oxygen. Low levels of several human carcinogens including tetrahydrofuran, benzene, and arsenic have also been intermittently detected in groundwater at river front monitoring wells. Historical detections of several inorganic contaminants, including selenium, appear to be the result of sampling and/or laboratory analytical artifacts which produced spurious data. The areal extent of groundwater impacts associated with the landfill is confined to the Lakeside facility property, although shallow groundwater contamination may also affect a relatively small area of a private property located immediately west of the landfill and adjacent to the Tualatin. Data indicates that groundwater impacts deepen towards the river extending to a maximum depth of approximately forty feet beneath the water table before discharging to the Tualatin River. An analysis of hydrogeologic conditions at the site concluded that no existing private drinking water wells located beyond the facility boundary are vulnerable to contamination emanating from the Lakeside Landfill.
Manner and Time of Release: Groundwater contamination is a result of leachate and possibly landfill gas released from the unlined landfill. Some of the contaminants detected in groundwater may be present in leachate while others are naturally occurring in soils and have been solubilized and mobilized as a result of leachate and/or gas altering the natural groundwater chemistry. Static water level measurements at the site's monitoring wells indicate that contaminated groundwater is probably discharging to the Tualatin River. Methane (a component of landfill gas) is being generated within the landfill, possibly from the organic matter diposals at the site (tree stumps, land clearing debris, lumber, past disposals food wastes, and wet garbage).

In 2014 a porewater study was undertaken and findings indicate that very little contamination from the landfill is actually reaching the river. See the remedial action section for more details.
Hazardous Substances/Waste Types: Groundwater contaminants of concern at the site include metals (As, Fe, Mn, Zn), VOCs (benzene, tetrahydrofuran) and various water quality parameters (dissolved oxygen, pH, total dissolved solids). Methane is present in the subsurface within the landfill.
Pathways: The exposure pathway of greatest concern is the discharge of contaminated groundwater to the Tualatin River and its impact on aquatic organisms. The most vulnerable organisms are the invertebrates (clams, worms, aquatic insects) that occupy the benthic environment in sediments beneath the channel bottom. Degradation of Tualatin River water quality is unlikely due to the high degree of dilution that occurs when groundwater mixes with stream flow. Contamination of domestic and irrigation wells due to leachate releases is considered highly unlikely.

Methane concentrations and pressures within the landfill may be sufficient to cause subsurface migration of methane toward nearby structures and other confined spaces. Methane is flammable and explosive at certain concentrations within confined spaces. Lakeside's preliminary methane monitoring and assessment indicates, however, that methane is not migrating from the landfill to on-site or off-site structures. (6/29/11 BAG) Ongoing methane monitoring indicates current methane conditions are not posing hazards at the landfill.
Environmental/Health Threats: Discharges of contaminated groundwater to nearby Tualatin River represent a potential threat to the river’s bird, mammal, and aquatic life populations.

No impacts to domestic or irrigation wells are anticipated.

If methane concentrations and pressures within the landfill are found to be sufficient to cause subsurface migration to nearby confined spaces, DEQ will require engineering controls and an appropriate monitoring program to protect human health and safety.
Status of Investigative or Remedial Action: (9/24/07 HDL/SRS) The landfill is currently performing a remedial investigation of human health and environmental impacts. This investigation includes: 1) locating and evaluating the vulnerability of domestic and irrigation wells in the area, 2) determining the concentration and rate of contaminant migration into the Tualatin River, 3) evaluating impacts to aquatic biota in Tualatin River, 4) determining the effectiveness of the landfill cover. DEQ anticipates the remedial investigation will be completed in early 2008.

The landfill is also performing a methane gas investigation under the direction of DEQ’s solid waste program.

(6/28/11 BAG) Lakeside has completed the Feasibility Study to address the landfill cover and groundwater contamination underlying the landfill. DEQ will be proceeding with public involvement and remedy selection through the summer/fall of 2011.

In September of 2011 a volumetric pan lysimeter was built near the top of the SW face of the landfill. The lysimeter dimensions are 8 x 16 x 5 feet deep. The basin is lined with geotextile fabric and two young pine trees were planted within the lysimeter basin. The lysimeter is instrumented to measure soil moisture, runoff, and percolation. Local rainfall and transpiration from the tree is also to be measured. The purpose of the lysimeter is to determine if the landfill cover can reach the goal of limiting rainfall infiltration to 1 inch/year. The lysimeter construction was completed in 2011 but not finalized when the landfill settlement negotiations brought further construction to a halt.

(8/12/13 RKW/SRS) The Record of Decision (ROD) for the project was signed December 2, 2011. It calls for: 1) enhancement of the landfill's evapotranspiration (ET) cover, 2) hydraulic containment of the groundwater contaminant plume below the landfill, 3) appropriate treatment of the wastewater generated by plume control, 4) performance monitoring of all remediation metrics including the goal of limiting stormwater infiltration below the landfill surface to 1.0 inch of water annually and, 5) Contingency measures to modify the remediation approach through Adaptive Management.

Landfill cover maintenance continued during 2012 in spite of uncertainty about the fate of the landfill during settlement negotiation. Maintenance included tree thinning, pruning, mowing, weed control, and tree planting. Approximately 3,700 trees, largely ponderosa pine and some KMX pine (hybrid species), were planted in 2012.

A Consent Judgment between DEQ and Howard Grabhorn was filed April 17, 2013. The judgment terminates the landfill's Solid Waste Disposal Site Closure Permit (No. 214) and releases Grabhorn from liability for cleanup. Composting operations at the facility are not effected by the settlement. With a settlement fund of $7 million DEQ will be responsible for performing the remedial actions approved by the Record of Decision (ROD) including post-closure monitoring and evapotranspiration cover maintenance.

(12/18/13 RKW/SRS) Semiannual groundwater and landfill gas monitoring resumed in November 2013. A long term constant rate aquifer test, needed to plan and engineer the groundwater remedy, was completed in December 2013.

(10/14 RKW/SRS) An additional 7,400 trees (ponderosa pine, shore pine, hemlock, douglas fir, port orford cedar, grand fir, giant sequoia, alder, Oregon white oak, Oregon ash, and various shrubs) were planted on the landfill in April 2014. The summer of 2014 was unusually hot and dry and in spite of watering trees twice a month there was considerable mortality. More trees will be planted in early 2015.

Pore water sampling was performed within the sediments of the Tualatin River in fall of 2014.

(3/26/15 RKW/SRS) An additional 4350 trees were planted in early February. The primary species was douglas fir with additional shore pine, ponderosa pine, and sitka spruce. Also included were a small number of sequoia, vine maple, cascara, oceanspray, and red flowering currant.

(9/24/15 RKW/SRS) In the fall of 2014 a porewater sampling investigation was undertaken along the shoreline of the landfill as well as upstream and downstream of the landfill. Impacts to the Tualatin River from the landfill were surprisingly difficult to discern. The high iron observed in groundwater appears to precipitate out before reaching the river. Arsenic, barium, and manganese are elevated in background areas and suggest that the landfill is not a significant source of these metals. Chloride is the best indicator of landfill impacts but it is only observed above remedial action levels immediately downgradient of the most contaminated groundwater wells MW-3 and MW-10, at the center of the landfill face. Another round of porewater sampling is underway in the fall of 2015 to confirm results from 2014. See the report in the documents section.

(12/05/16 RKW/SRS) In the fall of 2015 porewater sampling in the Tualatin River was again performed along the face of the landfill to confirm results of 2014. Porewater sampling in 2014 occurred just after river stage had risen in response to the onset of fall rains while porewater sampling in 2015 was earlier in the fall after a very dry summer. Porewater results in 2015 were elevated in comparison with 2014 for chloride, arsenic, barium, calcium, iron, and manganese in some locations along the face of the landfill. It was concluded that river stage can play a large role in porewater concentrations. Higher water in the winter months leads to groundwater flow reversal and precipitation of metals such as iron so wet season impacts to the river are much reduced. Dry season impacts are also limited. Arsenic, barium, manganese, calcium, and magnesium all appear to be elevated in background samples suggesting that natural geochemistry has a large role in metals input to the river. In 2016 porewater sampling will target the biologically active porewater zone close to the mudline and will also include bioassay sampling to better determine potential impacts to river bottom dwelling organisms.

In the summer of 2016 an investigation of areas of the landfill cap with sparse vegetation was performed. There are several areas on the landfill where trees have struggled to grow for many years. It was hypothesized that these areas were subject to increased methane discharge and that methane venting might improve tree survival in selected areas. Excessive methane in the soil starves vegetation of oxygen and causes stunting or die-off of plants and trees. An investigation of the overall landfill soil cap thickness in 2005 found the average cap thickness was over 10 feet. The 2016 investigation found that soil cap thickness was much smaller (average of 3 feet) in areas where vegetation is sparse. It was concluded that methane venting in these areas would not be effective and that adding more soil was likely the only means to improve vegetation survival.

[1/26/18 SRS/SAM] In June 2017, DEQ amended the groundwater portion of the ROD based on addtional porewater and toxicity studies performed since 2011. DEQ selected Alternative 8 - Landfill Monitoring and Maintenance and Enhancements to the ET Cover with Monitored Natural Attenuation of the Groundwater Plume. This alternative differs from the 2011 ROD in that groundwater remedial action through hydraulic containment using long-term pumping from extraction wells will be replaced with monitored natural attenuation. The updated ROD is available in WebDocs.
Data Sources: DEQ Solid Waste Permit files and ECSI Cleanup files for Lakeside Reclamation Landfill.

Substance Contamination Information

Substance Media Contaminated Concentration Level Date Recorded
ACETONE Groundwater 275 ppb in groundwater at well MW-10 on 11/11/04. 128 ppb at MW-9, 11/11/04. 35.5 ppb at MW-9, 5/4/00. 27.4 ppb at MW-4, 4/21/97. 11.9 at MW-9, 10/17/00. 5.7 ppb at MW-3. 5.7 ppb at well MW-3. 11/11/2004
AMMONIA NITROGEN Groundwater 4.01 ppm in groundwater at well MW-7 on 5/10/01. 3.3 ppm at well MW-9 on 11/25/97 and 4/24/02. 3.2 ppm at well MW-9 on 4/21/04. 5/10/2001
BARIUM Groundwater 729 ppb in groundwater at well MW-9 on 4/24/03. 688 ppb T. Ba at MW-9, 4/29/99. 681 ppb T. Ba at MW-9, 4/21/04. 649 ppb D. Ba at MW-9, 10/17/00. 639 ppb D. Ba at MW-9, 11/6/03. 615 ppb T. Ba at MW-9, 4/24/02. 614 ppb T. Ba at MW-10, 4/21/04. 4/24/2003
BENZENE Groundwater 2.7 ppb in groundwater at well MW-9 on 11/24/97. 2.44 ppb at MW-9, 10/20/97. 2.2 ppb at MW-9, 11/25/97. 1.83 ppb at MW-4, 11/24/97. 1.65 ppb at MW-4, 10/26/97. 1.5 ppb at MW-4, 3/31/95. 1.13 ppb at well MW-3, 4/21/04. 11/25/1997
BORON Groundwater 3130 ppb T. B in groundwater at well MW-4 on 4/21/04. 2990 ppb D. B at MW-4, 4/24/02. 2440 ppb D. B at MW-9, 11/25/97. 1890 ppb T. B at MW-9, 4/21/04. 1890 ppb D. B at MW-9, 4/21/04. 1850 ppb D. B at MW-9, 4/24/02. 958 ppb D. B at MW-4, 11/24/97. 4/21/2004
BUTYL ALCOHOL, tert- Groundwater 226 ppb in groundwater at well MW-10 11/11/2004 2:24:06 PM
CHLORIDE (AS ION) Groundwater 635 ppm in groundwater at well MW-10 4/21/2004 1:44:21 PM
CHLOROFORM Groundwater 1.17 ppb in groundwater at well MW-9 7/30/1997 2:28:12 PM
CHRYSENE Groundwater 10 ppb in groundwater at well MW-10 on 11/24/97. 11/24/1997 10:28:32 AM
DICHLOROETHANE,1,2- Groundwater 0.7 ppb in groundwater at well MW-10 on 11/24/97. 11/24/1997 10:42:41 AM
IRON Groundwater 123000 ppb in groundwater at well MW-9 on 11/25/97. 120000 ppb at MW-9, 11/25/97. 114000 ppb at MW-9, 4/29/99. 112000 ppb at MW-9, 10/1/98. 94900 ppb at MW-4, 11/24/97. 91600 ppb at MW-4, 10/1/98. 11/25/1997
IRON Other 26000 ppb in standing water from dumping area 10/6/1983 3:33:50 PM
IRON Surface Water 900 ppb in surface water from pond #4 (southwest pond) 10/6/1983 3:33:50 PM
ISOPROPYLBENZENE,P- Groundwater 4.9 ppb in groundwater at well MW-10 on 4/21/04. 1.7 ppb at MW-4, 4/21/04. 1.1 ppb at MW-4, 4/24/02. 1.07 ppb at MW-4, 6/5/95. 0.8 ppb at MW-9, 4/21/04. 0.6 ppb at MW-9, 4/24/02. 4/21/2004
MANGANESE Groundwater 15700 ppb in groundwater at well MW-10 on 11/6/03. 14600 ppb at MW-10, 11/11/04. 5450 ppb at MW-6, 10/1/98. 5420 at MW-6, 4/29/99. 5290 at MW-3, 4/21/04. 4500 at MW-4, 6/26/96. 11/6/2003
METHANE Soil Methane concentration yet to be determined in soils 5/31/2005 10:46:26 AM
NICKEL Groundwater 72 ppb T. Ni in groundwater at well MW-8 on 11/24/97. 60.8 ppb T. Ni at MW-8, 11/24/97. 48.1 ppb T. Ni at MW-7, 5/4/00. 47.7 ppb T. Ni at MW-7, 11/24/97. 25 ppb T. Ni at MW-6, 10/7/96. 11/24/1997
NICKEL Other 200 ppb in standing water at dumping area 10/6/1983 3:41:45 PM
POTASSIUM Groundwater 22 ppm in groundwater at well MW-3 1/3/1992
SODIUM Groundwater 149 ppm in groundwater at well MW-9 11/6/2003 1:50:51 PM
SULFATE (AS ION) Groundwater 40.2 ppm in groundwater at well MW-6 10/17/2000 1:52:06 PM
THALLIUM Groundwater 1.2 ppb T. Tl in groundwater at well MW-7 on 4/29/99. 0.35 ppb D. Tl at MW-10, 4/24/03. 0.26 ppb T. Tl at MW-6, 11/14/02. 0.24 ppb D. Tl at MW-10, 4/24/02. 4/29/1999
TRICHLOROBENZENE,1,2,4- Groundwater 1.7 ppb in groundwater at well MW-6 9/16/1994 2:43:19 PM
ZINC Groundwater 46000 ppb in groundwater at well MW-10 on 11/11/04. 46000 ppb D. Zn at MW-4, 3/31/95. 40,000 ppb T. Zn at MW-4, 3/31/95. 9000 ppb T. Zn at MW-3, 6/24/94. 8930 ppb D. Zn at MW-3, 4/21/04. 11/11/2004
ZINC Other 220 ppb in standing water in dumping area 10/6/1983 3:44:38 PM

Investigative, Remedial and Administrative Actions

Action Start Date Compl. Date Resp. Staff Lead Pgm
REMEDIAL DESIGN  (Primary Action) 05/17/2013   Sarah Miller SRS
View Full Report Showing Action History

Key to Certain Acronyms and Terms in this Report:

You may be able to obtain more information about this site by contacting Sarah Miller at the Northwest regional office or via email at If this does not work, you may contact Gil Wistar at (503) 229-5512, or via email at or contact the Northwest regional office.