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Fact Sheet and Class V Underground Injection Control (UIC) WPCF Permit Evaluation Class V Undergroun

Fact Sheet and Class V Underground Injection Control (UIC) WPCF Permit Evaluation Class V Undergroun 2025

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The document is a fact sheet and evaluation report for the Class V Underground Injection Control (UIC) Water Pollution Control Facilities (WPCF) permit issued to the City of Portland. It outlines the permit's purpose, which is to protect groundwater quality while allowing stormwater injection through UICs. The document details the permit conditions, monitoring requirements, compliance actions, and corrective measures necessary to ensure that stormwater discharges do not adversely affect groundwater resources. It emphasizes the importance of best management practices (BMPs), monitoring protocols, and regulatory compliance to maintain water quality standards.

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What industry has been using deep well injection?

In the 1950s, chemical companies began injecting industrial wastes into deep wells. As chemical manufacturing increased, so did the use of deep injection.

What are the disadvantages of a deep well?

The installation of deep wells is more complex and typically requires specialized drilling equipment. Maintenance for deep wells, as well as deep well pump repairs, can also be more challenging and costly due to the depth involved. Shallow wells and shallow well pumps are relatively easier to and maintain.

Is a septic tank an injection well?

Dry wells, cesspools, and septic system leach fields are examples of simple Class V wells. Because their construction often provides little or no pretreatment and these fluids are injected directly into or above an underground source of drinking water, proper management is important.

Is deep well injection safe?

Deep well injection for liquid waste has been safely used for many years at sites throughout the United States without documented damage to human health or the environment.

What are the negatives of deep well injections?

There are also some concerns as to long-lasting geologic effects of deep well injection, such as seismic activity, that have been discovered in recent years. There have also been numerous cases of deep wells failing and causing significant damage to the environment.

What is a class V uic well?

A Class V UIC well is a system used to inject nonhazardous fluids underground either into or above underground sources of drinking water. UIC well types range from simple shallow wells (e.g., dry wells, cesspools, and septic system leach fields) to complex experimental injection technologies.

What are the classification of injection wells?

Class I wells are used to inject hazardous and non-hazardous wastes into deep, isolated rock formations. Class II wells are used exclusively to inject fluids associated with oil and natural gas production. Class III wells are used to inject fluids to dissolve and extract minerals.

What is a potential and likely drawback to the deep well injection of hazardous wastes?

What is a potential, and likely, drawback to the deep-well injection of hazardous wastes? Well casings can corrode leaking hazardous waste into soil, rock, and gravel. It is hard to drill very deep into the ground.

Fact Sheet and Class V Underground Injection Control (UIC) WPCF Permit Evaluation Class V Undergroun 2025

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