Risk-Based Clean-Up

Risk-Based Clean-Up

Risk-Based remediation addresses the highest level of contamination from a leaking underground storage tank, with levels reported above 10,000 PPM. According to the DEQ, a risk-based clean-up offers the greatest amount of flexibility and adaptability to site-specific conditions. However, it is also the option that might require collecting additional site data and evaluation of more alternatives than a soil matrix or generic remedy clean-up. Risk-based clean-ups are the most rigorous option, with the collection of several soil samples to determine the magnitude and depth of contaminated soil, as well as how far the contamination has spread. The most important aspect of a risk-based clean-up is the evaluation of current and reasonably likely future risks to human health and the environment.

A risk-based remediation involves a soil investigation, which examines the pathways the contamination has likely spread. This pathway evaluation determines where the contaminants were released, how the contaminants can be transported to new locations and the reasonably likely ways that people may come into contact with them. Tests need to be conducted on enough samples to determine the lateral extent, as well as the depth of the petroleum contamination.

There are three investigative phases of concern while conducting a risk-based clean-up, phase two and three may not be necessary if the area of contaminated soil is limited enough in extent. Below are the steps, in order, that are required by the DEQ in order to close a risk-based clean-up:

Risk-Based Clean-Up and Free Product, Groundwater and Soil Vapor Gas

Petroleum Contaminated Soil (PCS) and/ or Free Product:

Up to seven (7) soil samples are taken to establish a representative sample and delineate the vertical and lateral extent of the pocket of petroleum-impacted soil, and potential or actual groundwater impacts. If it is determined that there is free product or large volumes of heavily contaminated soil, from which product may continue to migrate, mitigating the risk by excavation and off-site removal would be required, to the maximum extent practicable.

Risk-Based Clean-Up

Petroleum Contaminated Soil (PCS) seen during an excavation. The PCS is pictured here in the greyish color.

Risk-Based Clean-Up

The side view of the PCS, here you can see the coloration difference between the contaminated and the native soil.

Risk-Based Clean-Up

Free Product refilling into a sample boring hole

Risk-Based Clean-Up

Free Product within a sampling tube


Has groundwater at the site at risk or has it been impacted by the diesel contamination?

In order to determine if groundwater has been or could be potentially encountered, a 10’ separation is required by the DEQ between the vertical extent of the contaminated soil and any potential shallow groundwater.

If there is no impact or potential impact to groundwater?

The groundwater investigation is now completed, no further action would be required.

If groundwater has been or has the potential to be impacted, what are the next steps?

A representative well will be installed in the source area to determine if groundwater has been impacted by the release. The installation of the representative well is designed to obtain a groundwater sample to measure, if any, the water level elevation in the contaminated water or soil.

If the samples in the representative well have detections that exceed the DEQs Ingestion and Inhalation from Tap Water Risk-Based Clean-Up levels, a groundwater investigation is necessary. The groundwater investigation determines the extent of the contaminated groundwater, and whether it is limited only to the property of the leaking UST or if extends to neighboring properties.

If the samples in the representative well meet the DEQ Ingestion and Inhalation from Tap Water Risk Based Clean-Up levels, no further action would be required.

The 10’ separation boring cannot be obtained due to site conditions, what happens to the investigation?

If a 10’ separation boring cannot be completed due to examples like refusal (rocky soil, etc.) or if the tank is too deep, per the DEQ a Beneficial Well Survey would need to be conducted.

A Beneficial Well Survey determines if a release of hazardous substances has impacted or has the potential to impact groundwater or surface water, through contaminant migration. These determinations will be used for evaluating exposure pathways in human health and ecological risk assessment; for identifying hot spots of contamination; and for selection or approval of remedial actions at hazardous substance clean-up sites.

The DEQ requires the survey to identify all properties that are in proximity to the site with the leaking underground storage tank, which may be utilizing a water supply well. The well may be used for drinking water, irrigation, etc. DEQ regulations considers that any well on a property that is for domestic use, be accounted for. These surveys can and are conducted within and outside city limits.

Grd Water

Groundwater encountered within an opening within an underground storage tank.

Vapor Intrusion from soil or groundwater:

Vapor intrusion is the migration of Volatile Organic Compounds (VOCs) from the subsurface into buildings. Per the DEQ, vapors released from volatile substances can be slowly released from underground spills. These volatile constituents move upward through the pores in the soil, when the soil is exposed during excavation, as well as, from contaminated groundwater. The DEQ requires Soil Vapor Gas sampling (SVGs) to assess the potential of carcinogenic vapors entering residential buildings. When certain constituents of interest, such as benzene, ethylbenzene and naphthalene concentrations exceed the DEQ Vapor Intrusion into Residential Buildings Standards, soil vapor gas sampling would be required.

To assess the potential cancer risks from vapor intrusion into homes, soil vapor gas sampling is triggered if any of the following variables apply:

  • The plume of contamination exceeds 65 cubic yards
  • There are, or likely to be, buildings within 30 feet of Volatile Organic Compounds (VOCs)
  • A 10’ separation cannot be established between the vertical extent and any potential shallow groundwater

Due to site specific factors, the number and sample locations may vary. Sampling may be conducted within the home or on the exterior of the building, either through the sub-slab and/or the soil.

Risk-Based Clean-Up

Soil Vapor Gas Sampling at the exterior of the property

Risk-Based Clean-Up

Sub-Slab Sampling, in the interior of the building

For a more in-depth overview of the DEQs requirements and standards regarding Risk-Based Clean-Up and leaking tanks, please visit their Leaking Underground Storage Tank Program (LUST site) DEQ LUST Site.

Generic Remedy Clean-Up

Generic Remedy Clean-Up

A Generic Remedy Clean-Up is considered a mid-level contamination, consisting of a release of 501 – 10,000 PPM. This remediation is a soil-only clean-up as long as there is no impact to groundwater, no free product is present and there is no vapor intrusion into the home or building. A generic remedy may require soil removal, as well as additional soil samples around the tank to determine the extent of the contamination. Total Petroleum Hydrocarbon (TPH) concentrations up to, but not exceeding, 10,000 PPM of soil may be left in place if:

  • There is at least three feet of clean soil over the contaminated soil
  • The volume of remaining contaminated soil (over 500 PPM) does not exceed 65 cubic yards
  • Analysis for the presence of benzene, ethylbenzene and naphthalene must be performed on all samples exceeding 2,500 PPM.
Generic Remedy Clean-Up

Generic Remedy Clean-Up – this is the fill cap from a tank that was decommissioned through a generic remedy remediation. The concrete was cut in order to gain access to the tank underneath the concrete patio.

Generic Remedy Clean-Up

Generic Remedy Clean-Up – Fill material from a tank that was being decommission through generic remedy remediation, this tank was found to have leaked at 5710 PPM

Once the investigation of the soils around the tank and the contaminated soil has been removed, the generic remedy clean-up decommissioning of the tank can continue.

In order to establish if a generic remedy is necessary, the DEQ requires a site assessment must be conducted to determine the source, nature, magnitude and extent of the contamination associated with a release from the underground storage tank. The site assessment must specifically address:

Generic Remedy Clean-Up Investigation

  • Determine the presence of free product
    • If there is pooling of liquid fuel in the tank excavation area or if there is clearly visible saturated soil, free product is present and a generic remedy remediation is no longer acceptable.
  • Determine if groundwater is affected and the depth to groundwater
    • During the tank excavation, if groundwater impact is discovered, the DEQ requires the water be pumped from the pit. If the pit remains dry for 24 hours, sampling and clean-up may proceed under the generic remedy. If water returns in less than 24 hours, it is presumed to be groundwater and the use of the generic remedy remediation is not allowed.
  • Determine the vertical and horizontal extent of the heating oil contamination
    • If decommissioning will be performed by removing the tank, two samples must be taken from each end of the excavation, at least 6 inches below the bottom of the excavation. If, by visual observations, additional contamination or odors are detected, samples must be collected from these areas as well.
    • If the decommissioned tank is to stay within the ground, two soil samples are to be taken from each end of the tank, as well as one below the tank bottom. The samples are to be taken no more than six inches from the tank end and at least one foot below the tank bottom. If contamination or odors are encountered, based on visual observations, samples must also be collected from these areas as well.
    • An estimated volume of contaminated soil proposed to remain at the site will be required to ensure that the 65 cubic yard limitation is not exceeded. Results of soil samples analyzed for the presence of heating oil are required to determine both the vertical and horizontal extent of contamination remaining above 500 PPM.

We have provided a link, this provides more insight to understanding more of the DEQs requirements regarding Generic Remedy Clean-Up remediation standards and guidelines.

Soil Matrix Cleanup

Soil Matrix Cleanup

A Soil Matrix Cleanup, which consists of a release of 500 PPM or less, lands within the DEQs simplest level of remediation. Pending that, during the decommissioning process, no holes within the tank are observed, the DEQ will not require any additional sampling or scope of work, in addition to the usual Soil Matrix Evaluation used to close the LUST file.

Standards for a Soil Matrix Cleanup

The standard by which the DEQ closes an open file for a Soil Matrix Cleanup is as follows:

  • Removal or treatment of the contaminated soil is not required
  • An abbreviated risk assessment is allowed for the site, which is called a Soil Matrix Evaluation
  • The tank and the contaminated soil will remain within the ground
  • The final steps include creating the Soil Matrix Report and submitting the report to the DEQ. Once reviewed and approved by the DEQ, the site will be considered DEQ Certified and the site will have a “Closed Status”.
Soil Matrix Cleanup

Soil Matrix Cleanup – Tank found and marked out for sampling. The small circle inside the right side of the marked tank is the fill pipe.

Soil Matrix Cleanup

Soil Matrix Cleanup – While excavating a tank during a soil matrix decommissioning, holes are found within the tank. These holes cause diesel heating oil to leak into the surrounding soils.

Soil Matrix Cleanup

Soil Matrix Cleanup – Excavation of a tank removal soil matrix decommissioning

For more information regarding Soil Matrix Cleanup, please see the DEQ UST Cleanup Manual.

Important EcoTech Documents

For additional information regarding our service lines, we have attached supplementary documents for your reference.

Heating Oil Tanks

Radon Mitigation

Seismic Retrofits

Septic Tanks & Cesspools

Septic Tank Decommissioning

Septic Tank Decommissioning Common Questions

What is a septic tank?

A septic tank processes wastewater from the home and consists of two main parts, the tank and a drain field.  It encompasses a piping connection, allowing the waste to flow from the home, through the tank and into the drain field, these connections are made through a T pipe, allowing liquid to enter and exit without disturbing the surface above.  The septic tank treats the wastewater and allows the separation of solids and liquids, once broken down the solids remain in the tank while the liquids drain into the leach field.

Septic tanks may be concrete or metal, 5 to 7 feet long and 5 to 7 feet deep, and will be located 5 to 30 feet away from the home.

Are there dangers associated with abandoned septic tanks?

Septic tanks that are buried underground are susceptible to corrosion, thus weakening the stability of the structure. The instability can cause the system to collapse, causing serious injury or death. Septic tanks contain dangerous gases due to the breakdown of decomposing matter, falling into a tank can cause the possibility of being overcome by noxious gases.

How do I know if I have a cesspool or septic tank on my property?

Within the Portland Metro area, there are two methods that may help determine if you have a cesspool or septic tank on your property:

  • For a general rule:
    • If your home is east of the Willamette River, most systems installed were cesspools.
    • If your home is west of the Willamette River, most systems installed were septic tanks.

How do you find a septic tank?

The location of the system would need to be determined by sending out a technician to the property.  The technician locates the main plumbing stack that comes through the roof and visually extends a straight line from the exterior foundation line.  From the foundation, the technician would follow the visual straight line out to the septic tank, between 5 to 30 feet from the home.

Decommissioning of a septic tank

How do you decommission a septic tank?

The proper septic tank decommissioning permit will need to be obtained for the city and/or the county the septic system is located in.

EcoTech uses excavation equipment to dig to the top of the structure to expose and open the septic system.  Once accessed and per OSHA regulation, shoring of the area around the system is completed to prevent collapse of the shaft and to ensure the safety of our technicians.

Our technicians will then inspect the interior of the tank, and pump any liquid or sludge that may be present.

Contingent on the city and/or county permitting process, inspection of the system may need to take place prior to filling the tank.  Inspection may also need to take place after the tank has been filled, depending on permit requirements.

When the tank has been pumped of all sludge, and all relevant inspections completed, the tank can be filled with either sand or gravel.  Once the septic tank is decommissioned, the technicians would replace the soil overburden, bringing the area back to surface grade, along with a closed permit for the decommissioned septic tank.

Septic Tank Decommissioning

Septic Tank Decommissioning – Dug down and exposed septic tank

Septic Tank Decommissioning

Septic Tank Decommissioning – Roped off septic pit for safety

Septic Tank Decommissioning

Septic Tank Decommissioning – Broken terracotta pipe, this is part of the system that allows wastewater to drain from the home. When the pipe is broken, this allows waste to seep into the yard.

Septic Tank Decommissioning

Septic Tank Decommissioning – Filled septic tank, with T piping junction of metal pipe to terracotta pipe.

Septic Tank Decommissioning

Septic Tank Decommissioning – Filled septic tank, with T piping junction of metal pipe to terracotta pipe.

Septic Tank Decommissioning

Septic Tank Decommissioning – Filled septic tank, ready for overburden to be replaced

For more information on local cities requirements on septic tank decommissioning within the Portland Metro area, please click on the following links:

Radon Measurement

Radon Measurement Common Questions


How do I find out if I have Radon in my home?

The only way to determine radon levels in your home is to conduct a radon measurement test.

Can I conduct my own test?

Yes, there are two different tests that you can conduct yourself.

  • Short-Term Radon Test. A short-term test kit is the quickest way to conduct a test. These kits can stay in your home from two to 90 days, depending on the device type. Short-term testing requires your home to be under “closed-house conditions”, meaning all doors and windows must be closed during testing, other than normal comings and goings from the home.  However, a short-term test is less likely than a long-term test to tell you what your year-long average radon level is, as radon levels tend to vary from day to day and season to season.
  • Long-Term Radon Test. A long-term test kit remains in your home for a minimum of 91 days, although testing can continue for a year. Long-term testing provides a more accurate reading of the radon levels within your home, especially if the home is tested up to a year. Results from a long-term test are more likely to reflect the variances in the radon level, as levels fluctuate from day to day, season to season, as well as the average “open-house conditions” that consists of the normal comings and goings from the home.
Radon Measurement

Radon Measurement – Different radon measurement devices.

Where can I buy a short-term or long-term test?

EcoTech sells both the short-term and long-term tests kits, please visit our EcoTech Store for purchasing information. Radon test kits can also be purchased at most hardware stores and cost an average of $15-$35.

What if I’m in a real estate transaction?

If you are purchasing a home, most buyers and their agents, test the new home as part of the inspection period. A Certified Radon Measurement Professional should be hired to conduct the radon test. The third party tester will perform a two day test, the test will be placed in the lowest portion of the home (i.e. crawlspace or basement) and will be required to be under “closed-house conditions”.

Radon Measurement

Radon Measurement – Technician setting a Continuous Radon Monitor (CRM) to measure and report the hourly increments of the radon levels within the home.

Radon Measurement Results

What is measured to determine if there is radon within the home?

To determine the amount of radon within the air, it is measured in “picocuries per liter of air” or pCi/L.  The gas itself is not measured directly, it is actually the radioactivity the radon produces that is measured.

What do the radon test results mean?

  • If the measurement reading reflects a 4.0 or lower pCi/L, you and your agent will receive a detailed report and no mitigation will be needed. Although, the EPA does recommend that you test, using a short-term or long-term test, every two years.
Radon Measurement

Radon Measurement – This is a CRM report which shows 2.4 pCi/l, which is below the EPA Action Level

  • If the measurement reading reflects a 4.0 or higher pCi/L, you and your agent will receive a detailed report and a proposal for a radon mitigation system to lower the radon levels in the home.
Radon Measurement

Radon Measurement – Extremely high CRM test, the overall average is 24.9, which is above the Action Level

I’m in a real estate transaction and I’ve scheduled my sewer scope for the same time as the radon test, is that okay?

EcoTech highly recommends that you DO NOT schedule the sewer scope and radon measurement at the same time.  If the two inspections are scheduled together, a 12 hour delay should be placed on the measurement device after the scope is completed. The sewer scope can be considered a disruption to the “closed house conditions” that are required during the radon test. Open sewer pipes, during a scope, can allow radon gases into a home. Thus, if a sewer scope is performed during a radon test, the exposed sewer can cause a spike in the test, reflecting in a false reading.

Earthquake Preparation Checklist

Formulation of an emergency plan is one of the most important undertakings that can be accomplished before a disaster ever happens. We have laid out different tiers of strategies for you and your family to consider and implement before a catastrophe strikes.

Laying down the foundation

One of the first steps is conceptualizing what you will need first.

Meeting Point

  • Where will you meet after a disaster?
  • At home, have a designated spot outside of the home where everyone meets.
  • If you and your partner are at work, where will and how will you meet-up?
  • If you have children, who will pick them up from school?
  • Do you have pets? What is the ideal way to bring them along?
  • If everyone is scattered apart, what is the long-term game plan of a final assembly place. Will it be the local school, police or fire department, your home?

After you have formulated meeting places, practice. The Red Cross suggest that you practice earthquake and fire drills twice a year using multiple escape routes. By coordinating the drills when you change your clocks, it becomes easier to remember and to be consistent with this life-saving technique.

Outside Resources

An out-of-state contact should be chosen and everyone in the home should have the number. After a disaster, local phone lines may be jammed or down, making a long-distance call may be easier. If all of your family members are scattered apart from each other, having that outside contact may be the vital life-line that your family needs to use to let everyone know that you each are safe.

Also, reaching out to neighbors for additional resources, may not only help you, but them as well. They may have important skills or items at their disposal which may come in extremely handy in a disaster. Also, would they be willing to look after a child until you could make it home, if you have pets, would they be able to assist them?

The State and Portland area Counties and Cities are each creating their own earthquake emergency outreach plan, please visit their websites for additional resources:

Preparing an Emergency Kit and Important Information Storage

After surviving a quake, you will still need to get through the next couple days, up to weeks and even months. Creating an essential survival kit with food, water and household items will allow you and your family the ability to carry through until vital services are up and running.

We’ve laid this out in different levels of what would be the most vital to survive through items that would make life easier when basic luxuries are not available.

Emergency Preparedness List                                First Aid Kit Supply List

Essential Family Records

Crucial paperwork containing contact information for your home, banking, medical and benefit institutions can be equally important when trying to rebuild after a disaster.  Make copies of all listed and store them in at least two safe places, even consider having an out-of-state relative keep copies for you.  Have a “go-box” that contains this crucial documentation and should be kept with or near the Main Home EssentialsEssential Family Documentation

Cascadia Subduction Zone

Cascadia Subduction Zone

According to the United States Geological Survey (USGS) the forces that produce earthquakes in western Oregon are generated as the Juan de Fuca oceanic plate moves northeastward with respect to the North American continental plate at an average rate of about 1.5 inches per year along the Pacific Northwest coast. At the zone of contact between the North America and Pacific Plates, the Juan de Fuca Plate slides beneath the North American continent and sinks slowly into the earth’s mantle, producing the Cascade volcanoes and earthquakes. The zone of the shallow, east-dipping subducting plate is called the Cascadia Megathrust Fault.

Cascadia Subduction Zone

Cascadia Subduction Zone – Juan de Fuca Triple Junctions and Cascade Volcanic Arc

Studies have shown through geological evidence provided by buried soil layers, dead trees, and tsunami deposits that about every 500-600 years the upper portion of the shallow dipping Cascadia Fault ruptures offshore and releases this compression and causes great earthquakes of magnitude 8 to 9. (The information provided for this section was from a very fascinating read from the USGS entitled Earthquake Hazards and Lifelines in the Interstate 5 Urban Corridor.)

The consequence of a Subduction Zone earthquake are the largest earthquakes in the world, with a result of a minimum 8.5 magnitude quake.  The last “big one” from the CSZ was in January 1700, the average times between quakes are less than 300 years apart.  Needless to say, we are overdue.

We can expect numerous situations during and after a large-scale earthquake:

  • The earthquake could last minutes, followed by equally large aftershocks and Tsunamis
  • Utilities
    • No power for at least a month
    • Full scale utility service restoration (power, gas, water, sewer, communications, etc.) could take 3 to 12 months, if not longer.
    • No clean water
    • No access to sanitation
    • Broken waterlines
    • Fires due to leaking gas lines
  • Damaged roads and bridges destroyed
  • Thousands dead
  • Tens of thousands injured
  • Tens of thousands homeless

Reading this can seem bleak, but if we prepare and educate ourselves on how to live through and survive a “megathrust” quake, our chances of survival with multiply.

We have created an earthquake preparation page with guides and checklists on how you can prepare for yourself and your family during and after a major earthquake.

Additional websites with information regarding the earthquakes in the Northwest and the Cascadia Subduction Zone:

Seismic Retrofit Common Questions

 Why should I retrofit my home? 

  • To reduce the damage to your home, lessen the potential for injury and the loss of sentimental and monetary valuables.
  • Without retrofitting your home, you will not be able to obtain earthquake insurance.  In the case of a major earthquake and your home is destroyed, without insurance, you are left with a mortgage payment and no house.
  • Most crucial is the ability to occupy your home for weeks, even if it is destroyed. To think of your home as a shelter after a disaster is vital, you could still remain in the house to stay dry and limit your exposure to the weather.

What size earthquake will this protect me against?

Retrofitting your home does not equal fortification of your structure. The main goal of retrofitting your home is to reduce your risk against major injuries, protection of material property and to give you and your family the resiliency to survive, by using your home as a shelter against the elements.

What does it mean to retrofit?

In the most basic of terms, it is the modification of an existing structure to make them more resistant to seismic activity. Retrofitting can help prevent the home from slipping off the foundation and/or collapsing.  Please see our videos below showing the difference between and unattached and an attached home and how retrofitting can protect your investment.

Unattached house video  Attached house video

What about my water heater and other utilities?

Hot water heaters should be strapped to a wall or post to protect people from a bursting water heater and reduce fire potential. The installation of natural gas shut-off valves can help prevent houses from catching fire from natural gas lines.

I have an older home, why should I be worried about my home in an earthquake?

The majority of older homes are built and sit on top of a foundation and are not attached to it. Unless your home is built on a concrete slab, it is highly likely that it is constructed on a raised foundation with a crawlspace or basement. This type of construction does not give your home the strength to hold up to a strong earthquake that produces powerful lateral and upward movements, it will literally be knocked off its foundation.

The purpose of retrofitting is to attach the home to the foundation and give it the stability that it needs to withstand a violent earthquake.

Please visit our Seismic Retrofit Attachments – Illustration and Photos page for a detailed view of completed seismic upgrades.

Cesspool Decommissioning

Cesspool Decommissioning Common Questions

What is a cesspool?

In the most basic terms a cesspool is a constructed underground vault for the disposal of liquid waste and sewage. Cesspools are made of loose-fitting brick or concrete rings, which allows the liquids to seep through the brick gaps or perforations within the concrete rings, leaving the solids behind.

Original cesspools are typically 3- to 4-feet in diameter and usually located 10 feet away from the exterior foundation of the home, in line with the main 4” sewer-vent pipe. Homes with crawlspaces or slab on grade construction have cesspools typically located about 3- to 5-feet below ground surface, while homes with a basement will commonly be 8- to 10-feet below the ground surface.

Cesspool Decommissioning

Cesspool Decommissioning – Technician performing an onsite cesspool evaluation

Why should I worry about a cesspool?

Abandoned cesspools can become unstable and collapse, causing a sinkhole or completely collapse within the yard. Falling into a collapsed or collapsing cesspool, that may contain liquids and sludge, can cause serious injury or death.

If you suspect that a sinkhole is forming within your yard, the area should be roped off immediately to prevent anyone from falling into the opening and a qualified expert should be contacted for assistance.

How do you find a cesspool(s)?

The likely location(s) of the cesspool(s) would need to be determined by sending out a technician to the property and conducting research through public records, if available.  The on-site technician locates the main 4” main sewer-vent pipe that extends through the roof and matches it up to information gained through public records.  From the foundation, original cesspools are usually 10’ from the home. If multiple cesspools are located on the property, they can generally be found through diagrams within public records. Following the original plumbing, gaining information through public records and physically probing to them is the most reliable way to find the cesspool(s).


Cesspool Decommissioning

Cesspool Decommissioning – Cesspool marked out for excavation

Decommissioning of a cesspool

How do you decommission a cesspool?

EcoTech uses excavation equipment to dig to the top of the structure to expose and open the cesspool. Once the cesspool lid is removed, our technicians will then inspect the interior of the cesspool, pump any liquid or sludge that may be present, and completely fill the cesspool with gravel or sand. After the decommissioning has taken place, the technicians replace the soil overburden, bringing the area back to surface grade

The proper cesspool decommissioning permit will need to be obtained for the city and/or the county the cesspool is located in.  An inspection may also need to take place, after the system has been filled, depending on the county. Multnomah County will always require an inspection of the filled cesspool, prior to the decommissioning permit being finalized and the overburden replaced. If an inspection is required by the city/county, and a permit pulled for the cesspool decommissioning, once approved, the permit will be closed with the city.


Cesspool Decommissioning

Cesspool Decommissioning – Cesspool found, constructed out of loose fitting bricks

Cesspool Decommissioning

Cesspool Decommissioning – Cesspool found, constructed of concrete rings

Cesspool Decommissioning

Cesspool Decommissioning – Cesspool filled with sand, excavation fenced off and ready for inspection

For more information on local cities requirements on cesspool decommissioning within the Portland Metro area, please click on the following links:

Please note: although most of these links will reference septic tanks, the decommissioning processes is relatively similar.